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mac80211: check vif pointer before airtime calculation
[linux-2.6-block.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
3ee9306b
AG		 559 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
560 lockdep_rtnl_is_held()) {
ca986ad9
AVS		 561 if (pos->reqid == reqid)
562 return pos;
563 }
b34939b9 564 return NULL;
ca986ad9
AVS		 565}
566
567/*
568 * Determines if a scheduled scan request can be handled. When a legacy
569 * scheduled scan is running no other scheduled scan is allowed regardless
570 * whether the request is for legacy or multi-support scan. When a multi-support
571 * scheduled scan is running a request for legacy scan is not allowed. In this
572 * case a request for multi-support scan can be handled if resources are
573 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
574 */
575int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
576 bool want_multi)
577{
578 struct cfg80211_sched_scan_request *pos;
579 int i = 0;
580
581 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
582 /* request id zero means legacy in progress */
583 if (!i && !pos->reqid)
584 return -EINPROGRESS;
585 i++;
586 }
587
588 if (i) {
589 /* no legacy allowed when multi request(s) are active */
590 if (!want_multi)
591 return -EINPROGRESS;
592
593 /* resource limit reached */
594 if (i == rdev->wiphy.max_sched_scan_reqs)
595 return -ENOSPC;
596 }
597 return 0;
598}
599
b34939b9 600void cfg80211_sched_scan_results_wk(struct work_struct *work)
807f8a8c
LC		 601{
602 struct cfg80211_registered_device *rdev;
b34939b9 603 struct cfg80211_sched_scan_request *req, *tmp;
807f8a8c 604
b34939b9
AVS		 605 rdev = container_of(work, struct cfg80211_registered_device,
606 sched_scan_res_wk);
807f8a8c 607
5fe231e8 608 rtnl_lock();
b34939b9
AVS		 609 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
610 if (req->report_results) {
611 req->report_results = false;
612 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
613 /* flush entries from previous scans */
614 spin_lock_bh(&rdev->bss_lock);
615 __cfg80211_bss_expire(rdev, req->scan_start);
616 spin_unlock_bh(&rdev->bss_lock);
617 req->scan_start = jiffies;
618 }
619 nl80211_send_sched_scan(req,
620 NL80211_CMD_SCHED_SCAN_RESULTS);
15d6030b 621 }
15d6030b 622 }
5fe231e8 623 rtnl_unlock();
807f8a8c
LC		 624}
625
b34939b9 626void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
807f8a8c 627{
ca986ad9
AVS		 628 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
629 struct cfg80211_sched_scan_request *request;
630
b34939b9 631 trace_cfg80211_sched_scan_results(wiphy, reqid);
807f8a8c 632 /* ignore if we're not scanning */
31a60ed1 633
1b57b621 634 rcu_read_lock();
b34939b9
AVS		 635 request = cfg80211_find_sched_scan_req(rdev, reqid);
636 if (request) {
637 request->report_results = true;
638 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
639 }
1b57b621 640 rcu_read_unlock();
807f8a8c
LC		 641}
642EXPORT_SYMBOL(cfg80211_sched_scan_results);
643
b34939b9 644void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
807f8a8c 645{
f26cbf40 646 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
807f8a8c 647
792e6aa7
EP		 648 ASSERT_RTNL();
649
b34939b9 650 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
4ee3e063 651
b34939b9 652 __cfg80211_stop_sched_scan(rdev, reqid, true);
792e6aa7
EP		 653}
654EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
655
b34939b9 656void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
792e6aa7
EP		 657{
658 rtnl_lock();
b34939b9 659 cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
5fe231e8 660 rtnl_unlock();
807f8a8c 661}
807f8a8c
LC		 662EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
663
ca986ad9
AVS		 664int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
665 struct cfg80211_sched_scan_request *req,
666 bool driver_initiated)
807f8a8c 667{
5fe231e8 668 ASSERT_RTNL();
807f8a8c 669
85a9994a 670 if (!driver_initiated) {
3a3ecf1d 671 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
85a9994a
LC		 672 if (err)
673 return err;
674 }
807f8a8c 675
ca986ad9 676 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
807f8a8c 677
ca986ad9 678 cfg80211_del_sched_scan_req(rdev, req);
807f8a8c 679
3b4670ff 680 return 0;
807f8a8c
LC		 681}
682
ca986ad9
AVS		 683int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
684 u64 reqid, bool driver_initiated)
685{
686 struct cfg80211_sched_scan_request *sched_scan_req;
687
688 ASSERT_RTNL();
689
690 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
b34939b9
AVS		 691 if (!sched_scan_req)
692 return -ENOENT;
ca986ad9
AVS		 693
694 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
695 driver_initiated);
696}
697
1b8ec87a 698void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
cb3a8eec
DW		 699 unsigned long age_secs)
700{
701 struct cfg80211_internal_bss *bss;
702 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
703
1b8ec87a
ZG		 704 spin_lock_bh(&rdev->bss_lock);
705 list_for_each_entry(bss, &rdev->bss_list, list)
cb3a8eec 706 bss->ts -= age_jiffies;
1b8ec87a 707 spin_unlock_bh(&rdev->bss_lock);
cb3a8eec
DW		 708}
709
1b8ec87a 710void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
2a519311 711{
1b8ec87a 712 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
2a519311
JB		 713}
714
49a68e0d
JB		 715const struct element *
716cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
717 const u8 *match, unsigned int match_len,
718 unsigned int match_offset)
2a519311 719{
0f3b07f0
JB		 720 const struct element *elem;
721
0f3b07f0 722 for_each_element_id(elem, eid, ies, len) {
49a68e0d
JB		 723 if (elem->datalen >= match_offset + match_len &&
724 !memcmp(elem->data + match_offset, match, match_len))
725 return elem;
2a519311 726 }
fbd05e4a
LC		 727
728 return NULL;
2a519311 729}
49a68e0d 730EXPORT_SYMBOL(cfg80211_find_elem_match);
2a519311 731
49a68e0d
JB		 732const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
733 const u8 *ies,
734 unsigned int len)
0c28ec58 735{
49a68e0d 736 const struct element *elem;
fbd05e4a
LC		 737 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
738 int match_len = (oui_type < 0) ? 3 : sizeof(match);
0c28ec58 739
9e9ea439
EG		 740 if (WARN_ON(oui_type > 0xff))
741 return NULL;
742
49a68e0d
JB		 743 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
744 match, match_len, 0);
6719429d 745
49a68e0d 746 if (!elem || elem->datalen < 4)
fbd05e4a 747 return NULL;
6719429d 748
49a68e0d 749 return elem;
0c28ec58 750}
49a68e0d 751EXPORT_SYMBOL(cfg80211_find_vendor_elem);
0c28ec58 752
4593c4cb
JB		 753/**
754 * enum bss_compare_mode - BSS compare mode
755 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
756 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
757 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
758 */
759enum bss_compare_mode {
760 BSS_CMP_REGULAR,
761 BSS_CMP_HIDE_ZLEN,
762 BSS_CMP_HIDE_NUL,
763};
764
dd9dfb9f 765static int cmp_bss(struct cfg80211_bss *a,
5622f5bb 766 struct cfg80211_bss *b,
4593c4cb 767 enum bss_compare_mode mode)
dd9dfb9f 768{
9caf0364 769 const struct cfg80211_bss_ies *a_ies, *b_ies;
3af6341c
JB		 770 const u8 *ie1 = NULL;
771 const u8 *ie2 = NULL;
5622f5bb 772 int i, r;
dd9dfb9f 773
3af6341c
JB		 774 if (a->channel != b->channel)
775 return b->channel->center_freq - a->channel->center_freq;
dd9dfb9f 776
9caf0364
JB		 777 a_ies = rcu_access_pointer(a->ies);
778 if (!a_ies)
779 return -1;
780 b_ies = rcu_access_pointer(b->ies);
781 if (!b_ies)
782 return 1;
783
3af6341c
JB		 784 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
785 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
786 a_ies->data, a_ies->len);
787 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
788 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
789 b_ies->data, b_ies->len);
790 if (ie1 && ie2) {
791 int mesh_id_cmp;
792
793 if (ie1[1] == ie2[1])
794 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
795 else
796 mesh_id_cmp = ie2[1] - ie1[1];
797
798 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
799 a_ies->data, a_ies->len);
800 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
801 b_ies->data, b_ies->len);
802 if (ie1 && ie2) {
803 if (mesh_id_cmp)
804 return mesh_id_cmp;
805 if (ie1[1] != ie2[1])
806 return ie2[1] - ie1[1];
807 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
808 }
809 }
810
3af6341c
JB		 811 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
812 if (r)
813 return r;
814
9caf0364
JB		 815 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
816 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
dd9dfb9f 817
5622f5bb
JB		 818 if (!ie1 && !ie2)
819 return 0;
820
f94f8b16 821 /*
5622f5bb
JB		 822 * Note that with "hide_ssid", the function returns a match if
823 * the already-present BSS ("b") is a hidden SSID beacon for
824 * the new BSS ("a").
f94f8b16 825 */
dd9dfb9f
DT		 826
827 /* sort missing IE before (left of) present IE */
828 if (!ie1)
829 return -1;
830 if (!ie2)
831 return 1;
832
4593c4cb
JB		 833 switch (mode) {
834 case BSS_CMP_HIDE_ZLEN:
835 /*
836 * In ZLEN mode we assume the BSS entry we're
837 * looking for has a zero-length SSID. So if
838 * the one we're looking at right now has that,
839 * return 0. Otherwise, return the difference
840 * in length, but since we're looking for the
841 * 0-length it's really equivalent to returning
842 * the length of the one we're looking at.
843 *
844 * No content comparison is needed as we assume
845 * the content length is zero.
846 */
847 return ie2[1];
848 case BSS_CMP_REGULAR:
849 default:
850 /* sort by length first, then by contents */
851 if (ie1[1] != ie2[1])
852 return ie2[1] - ie1[1];
5622f5bb 853 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
4593c4cb
JB		 854 case BSS_CMP_HIDE_NUL:
855 if (ie1[1] != ie2[1])
856 return ie2[1] - ie1[1];
857 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
858 for (i = 0; i < ie2[1]; i++)
859 if (ie2[i + 2])
860 return -1;
861 return 0;
862 }
dd9dfb9f
DT		 863}
864
6eb18137 865static bool cfg80211_bss_type_match(u16 capability,
57fbcce3 866 enum nl80211_band band,
6eb18137
DL		 867 enum ieee80211_bss_type bss_type)
868{
869 bool ret = true;
870 u16 mask, val;
871
872 if (bss_type == IEEE80211_BSS_TYPE_ANY)
873 return ret;
874
57fbcce3 875 if (band == NL80211_BAND_60GHZ) {
6eb18137
DL		 876 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
877 switch (bss_type) {
878 case IEEE80211_BSS_TYPE_ESS:
879 val = WLAN_CAPABILITY_DMG_TYPE_AP;
880 break;
881 case IEEE80211_BSS_TYPE_PBSS:
882 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
883 break;
884 case IEEE80211_BSS_TYPE_IBSS:
885 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
886 break;
887 default:
888 return false;
889 }
890 } else {
891 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
892 switch (bss_type) {
893 case IEEE80211_BSS_TYPE_ESS:
894 val = WLAN_CAPABILITY_ESS;
895 break;
896 case IEEE80211_BSS_TYPE_IBSS:
897 val = WLAN_CAPABILITY_IBSS;
898 break;
899 case IEEE80211_BSS_TYPE_MBSS:
900 val = 0;
901 break;
902 default:
903 return false;
904 }
905 }
906
907 ret = ((capability & mask) == val);
908 return ret;
909}
910
0e3a39b5 911/* Returned bss is reference counted and must be cleaned up appropriately. */
2a519311
JB		 912struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
913 struct ieee80211_channel *channel,
914 const u8 *bssid,
79420f09 915 const u8 *ssid, size_t ssid_len,
6eb18137
DL		 916 enum ieee80211_bss_type bss_type,
917 enum ieee80211_privacy privacy)
2a519311 918{
f26cbf40 919 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311 920 struct cfg80211_internal_bss *bss, *res = NULL;
ccb6c136 921 unsigned long now = jiffies;
6eb18137 922 int bss_privacy;
2a519311 923
6eb18137
DL		 924 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
925 privacy);
4ee3e063 926
1b8ec87a 927 spin_lock_bh(&rdev->bss_lock);
2a519311 928
1b8ec87a 929 list_for_each_entry(bss, &rdev->bss_list, list) {
6eb18137
DL		 930 if (!cfg80211_bss_type_match(bss->pub.capability,
931 bss->pub.channel->band, bss_type))
932 continue;
933
934 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
935 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
936 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
79420f09 937 continue;
2a519311
JB		 938 if (channel && bss->pub.channel != channel)
939 continue;
c14a7400
JB		 940 if (!is_valid_ether_addr(bss->pub.bssid))
941 continue;
ccb6c136
JB		 942 /* Don't get expired BSS structs */
943 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
944 !atomic_read(&bss->hold))
945 continue;
2a519311
JB		 946 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
947 res = bss;
1b8ec87a 948 bss_ref_get(rdev, res);
2a519311
JB		 949 break;
950 }
951 }
952
1b8ec87a 953 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 954 if (!res)
955 return NULL;
4ee3e063 956 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 957 return &res->pub;
958}
959EXPORT_SYMBOL(cfg80211_get_bss);
960
1b8ec87a 961static void rb_insert_bss(struct cfg80211_registered_device *rdev,
2a519311
JB		 962 struct cfg80211_internal_bss *bss)
963{
1b8ec87a 964 struct rb_node **p = &rdev->bss_tree.rb_node;
2a519311
JB		 965 struct rb_node *parent = NULL;
966 struct cfg80211_internal_bss *tbss;
967 int cmp;
968
969 while (*p) {
970 parent = *p;
971 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
972
4593c4cb 973 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
2a519311
JB		 974
975 if (WARN_ON(!cmp)) {
976 /* will sort of leak this BSS */
977 return;
978 }
979
980 if (cmp < 0)
981 p = &(*p)->rb_left;
982 else
983 p = &(*p)->rb_right;
984 }
985
986 rb_link_node(&bss->rbn, parent, p);
1b8ec87a 987 rb_insert_color(&bss->rbn, &rdev->bss_tree);
2a519311
JB		 988}
989
990static struct cfg80211_internal_bss *
1b8ec87a 991rb_find_bss(struct cfg80211_registered_device *rdev,
5622f5bb 992 struct cfg80211_internal_bss *res,
4593c4cb 993 enum bss_compare_mode mode)
dd9dfb9f 994{
1b8ec87a 995 struct rb_node *n = rdev->bss_tree.rb_node;
dd9dfb9f
DT		 996 struct cfg80211_internal_bss *bss;
997 int r;
998
999 while (n) {
1000 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
4593c4cb 1001 r = cmp_bss(&res->pub, &bss->pub, mode);
dd9dfb9f
DT		 1002
1003 if (r == 0)
1004 return bss;
1005 else if (r < 0)
1006 n = n->rb_left;
1007 else
1008 n = n->rb_right;
1009 }
1010
1011 return NULL;
1012}
1013
1b8ec87a 1014static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
776b3580 1015 struct cfg80211_internal_bss *new)
dd9dfb9f 1016{
9caf0364 1017 const struct cfg80211_bss_ies *ies;
776b3580
JB		 1018 struct cfg80211_internal_bss *bss;
1019 const u8 *ie;
1020 int i, ssidlen;
1021 u8 fold = 0;
9853a55e 1022 u32 n_entries = 0;
9caf0364 1023
776b3580 1024 ies = rcu_access_pointer(new->pub.beacon_ies);
9caf0364 1025 if (WARN_ON(!ies))
776b3580 1026 return false;
dd9dfb9f 1027
776b3580
JB		 1028 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1029 if (!ie) {
1030 /* nothing to do */
1031 return true;
1032 }
1033
1034 ssidlen = ie[1];
1035 for (i = 0; i < ssidlen; i++)
1036 fold |= ie[2 + i];
1037
1038 if (fold) {
1039 /* not a hidden SSID */
1040 return true;
1041 }
1042
1043 /* This is the bad part ... */
1044
1b8ec87a 1045 list_for_each_entry(bss, &rdev->bss_list, list) {
9853a55e
JB		 1046 /*
1047 * we're iterating all the entries anyway, so take the
1048 * opportunity to validate the list length accounting
1049 */
1050 n_entries++;
1051
776b3580
JB		 1052 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1053 continue;
1054 if (bss->pub.channel != new->pub.channel)
1055 continue;
dcd6eac1
SW		 1056 if (bss->pub.scan_width != new->pub.scan_width)
1057 continue;
776b3580
JB		 1058 if (rcu_access_pointer(bss->pub.beacon_ies))
1059 continue;
1060 ies = rcu_access_pointer(bss->pub.ies);
1061 if (!ies)
1062 continue;
1063 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1064 if (!ie)
1065 continue;
1066 if (ssidlen && ie[1] != ssidlen)
1067 continue;
776b3580
JB		 1068 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1069 continue;
1070 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1071 list_del(&bss->hidden_list);
1072 /* combine them */
1073 list_add(&bss->hidden_list, &new->hidden_list);
1074 bss->pub.hidden_beacon_bss = &new->pub;
1075 new->refcount += bss->refcount;
1076 rcu_assign_pointer(bss->pub.beacon_ies,
1077 new->pub.beacon_ies);
1078 }
1079
9853a55e
JB		 1080 WARN_ONCE(n_entries != rdev->bss_entries,
1081 "rdev bss entries[%d]/list[len:%d] corruption\n",
1082 rdev->bss_entries, n_entries);
1083
776b3580 1084 return true;
dd9dfb9f
DT		 1085}
1086
0cd01efb
SS		 1087struct cfg80211_non_tx_bss {
1088 struct cfg80211_bss *tx_bss;
1089 u8 max_bssid_indicator;
1090 u8 bssid_index;
1091};
1092
3ab8227d
SM		 1093static bool
1094cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1095 struct cfg80211_internal_bss *known,
1096 struct cfg80211_internal_bss *new,
1097 bool signal_valid)
1098{
1099 lockdep_assert_held(&rdev->bss_lock);
1100
1101 /* Update IEs */
1102 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1103 const struct cfg80211_bss_ies *old;
1104
1105 old = rcu_access_pointer(known->pub.proberesp_ies);
1106
1107 rcu_assign_pointer(known->pub.proberesp_ies,
1108 new->pub.proberesp_ies);
1109 /* Override possible earlier Beacon frame IEs */
1110 rcu_assign_pointer(known->pub.ies,
1111 new->pub.proberesp_ies);
1112 if (old)
1113 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1114 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1115 const struct cfg80211_bss_ies *old;
1116 struct cfg80211_internal_bss *bss;
1117
1118 if (known->pub.hidden_beacon_bss &&
1119 !list_empty(&known->hidden_list)) {
1120 const struct cfg80211_bss_ies *f;
1121
1122 /* The known BSS struct is one of the probe
1123 * response members of a group, but we're
1124 * receiving a beacon (beacon_ies in the new
1125 * bss is used). This can only mean that the
1126 * AP changed its beacon from not having an
1127 * SSID to showing it, which is confusing so
1128 * drop this information.
1129 */
1130
1131 f = rcu_access_pointer(new->pub.beacon_ies);
1132 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1133 return false;
1134 }
1135
1136 old = rcu_access_pointer(known->pub.beacon_ies);
1137
1138 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1139
1140 /* Override IEs if they were from a beacon before */
1141 if (old == rcu_access_pointer(known->pub.ies))
1142 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1143
1144 /* Assign beacon IEs to all sub entries */
1145 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1146 const struct cfg80211_bss_ies *ies;
1147
1148 ies = rcu_access_pointer(bss->pub.beacon_ies);
1149 WARN_ON(ies != old);
1150
1151 rcu_assign_pointer(bss->pub.beacon_ies,
1152 new->pub.beacon_ies);
1153 }
1154
1155 if (old)
1156 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1157 }
1158
1159 known->pub.beacon_interval = new->pub.beacon_interval;
1160
1161 /* don't update the signal if beacon was heard on
1162 * adjacent channel.
1163 */
1164 if (signal_valid)
1165 known->pub.signal = new->pub.signal;
1166 known->pub.capability = new->pub.capability;
1167 known->ts = new->ts;
1168 known->ts_boottime = new->ts_boottime;
1169 known->parent_tsf = new->parent_tsf;
1170 known->pub.chains = new->pub.chains;
1171 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1172 IEEE80211_MAX_CHAINS);
1173 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1174 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1175 known->pub.bssid_index = new->pub.bssid_index;
1176
1177 return true;
1178}
1179
0e3a39b5 1180/* Returned bss is reference counted and must be cleaned up appropriately. */
a3ce17d1 1181struct cfg80211_internal_bss *
1b8ec87a 1182cfg80211_bss_update(struct cfg80211_registered_device *rdev,
3afc2167 1183 struct cfg80211_internal_bss *tmp,
a3ce17d1 1184 bool signal_valid, unsigned long ts)
2a519311
JB		 1185{
1186 struct cfg80211_internal_bss *found = NULL;
2a519311 1187
9caf0364 1188 if (WARN_ON(!tmp->pub.channel))
2a519311 1189 return NULL;
2a519311 1190
a3ce17d1 1191 tmp->ts = ts;
2a519311 1192
1b8ec87a 1193 spin_lock_bh(&rdev->bss_lock);
2a519311 1194
9caf0364 1195 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1b8ec87a 1196 spin_unlock_bh(&rdev->bss_lock);
9caf0364
JB		 1197 return NULL;
1198 }
1199
1b8ec87a 1200 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
2a519311 1201
cd1658f5 1202 if (found) {
3ab8227d
SM		 1203 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1204 goto drop;
2a519311 1205 } else {
9caf0364 1206 struct cfg80211_internal_bss *new;
dd9dfb9f 1207 struct cfg80211_internal_bss *hidden;
9caf0364 1208 struct cfg80211_bss_ies *ies;
dd9dfb9f 1209
9caf0364
JB		 1210 /*
1211 * create a copy -- the "res" variable that is passed in
1212 * is allocated on the stack since it's not needed in the
1213 * more common case of an update
1214 */
1b8ec87a 1215 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
9caf0364
JB		 1216 GFP_ATOMIC);
1217 if (!new) {
1218 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1219 if (ies)
1220 kfree_rcu(ies, rcu_head);
1221 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1222 if (ies)
1223 kfree_rcu(ies, rcu_head);
776b3580 1224 goto drop;
9caf0364
JB		 1225 }
1226 memcpy(new, tmp, sizeof(*new));
776b3580
JB		 1227 new->refcount = 1;
1228 INIT_LIST_HEAD(&new->hidden_list);
7011ba58 1229 INIT_LIST_HEAD(&new->pub.nontrans_list);
776b3580
JB		 1230
1231 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1b8ec87a 1232 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
776b3580 1233 if (!hidden)
1b8ec87a 1234 hidden = rb_find_bss(rdev, tmp,
776b3580
JB		 1235 BSS_CMP_HIDE_NUL);
1236 if (hidden) {
1237 new->pub.hidden_beacon_bss = &hidden->pub;
1238 list_add(&new->hidden_list,
1239 &hidden->hidden_list);
1240 hidden->refcount++;
1241 rcu_assign_pointer(new->pub.beacon_ies,
1242 hidden->pub.beacon_ies);
1243 }
1244 } else {
1245 /*
1246 * Ok so we found a beacon, and don't have an entry. If
1247 * it's a beacon with hidden SSID, we might be in for an
1248 * expensive search for any probe responses that should
1249 * be grouped with this beacon for updates ...
1250 */
1b8ec87a 1251 if (!cfg80211_combine_bsses(rdev, new)) {
776b3580
JB		 1252 kfree(new);
1253 goto drop;
1254 }
1255 }
1256
9853a55e
JB		 1257 if (rdev->bss_entries >= bss_entries_limit &&
1258 !cfg80211_bss_expire_oldest(rdev)) {
1259 kfree(new);
1260 goto drop;
1261 }
1262
a3584f56 1263 /* This must be before the call to bss_ref_get */
0cd01efb 1264 if (tmp->pub.transmitted_bss) {
a3584f56 1265 struct cfg80211_internal_bss *pbss =
0cd01efb 1266 container_of(tmp->pub.transmitted_bss,
a3584f56
SS		 1267 struct cfg80211_internal_bss,
1268 pub);
1269
0cd01efb 1270 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
a3584f56
SS		 1271 bss_ref_get(rdev, pbss);
1272 }
1273
1b8ec87a 1274 list_add_tail(&new->list, &rdev->bss_list);
9853a55e 1275 rdev->bss_entries++;
1b8ec87a 1276 rb_insert_bss(rdev, new);
9caf0364 1277 found = new;
2a519311
JB		 1278 }
1279
1b8ec87a
ZG		 1280 rdev->bss_generation++;
1281 bss_ref_get(rdev, found);
1282 spin_unlock_bh(&rdev->bss_lock);
2a519311 1283
2a519311 1284 return found;
776b3580 1285 drop:
1b8ec87a 1286 spin_unlock_bh(&rdev->bss_lock);
776b3580 1287 return NULL;
2a519311
JB		 1288}
1289
119f94a6
JM		 1290/*
1291 * Update RX channel information based on the available frame payload
1292 * information. This is mainly for the 2.4 GHz band where frames can be received
1293 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1294 * element to indicate the current (transmitting) channel, but this might also
1295 * be needed on other bands if RX frequency does not match with the actual
1296 * operating channel of a BSS.
1297 */
0172bb75
JB		 1298static struct ieee80211_channel *
1299cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
119f94a6
JM		 1300 struct ieee80211_channel *channel,
1301 enum nl80211_bss_scan_width scan_width)
0172bb75
JB		 1302{
1303 const u8 *tmp;
1304 u32 freq;
1305 int channel_number = -1;
119f94a6 1306 struct ieee80211_channel *alt_channel;
0172bb75
JB		 1307
1308 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1309 if (tmp && tmp[1] == 1) {
1310 channel_number = tmp[2];
1311 } else {
1312 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1313 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1314 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1315
1316 channel_number = htop->primary_chan;
1317 }
1318 }
1319
119f94a6
JM		 1320 if (channel_number < 0) {
1321 /* No channel information in frame payload */
0172bb75 1322 return channel;
119f94a6 1323 }
0172bb75
JB		 1324
1325 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
119f94a6
JM		 1326 alt_channel = ieee80211_get_channel(wiphy, freq);
1327 if (!alt_channel) {
1328 if (channel->band == NL80211_BAND_2GHZ) {
1329 /*
1330 * Better not allow unexpected channels when that could
1331 * be going beyond the 1-11 range (e.g., discovering
1332 * BSS on channel 12 when radio is configured for
1333 * channel 11.
1334 */
1335 return NULL;
1336 }
1337
1338 /* No match for the payload channel number - ignore it */
1339 return channel;
1340 }
1341
1342 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1343 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1344 /*
1345 * Ignore channel number in 5 and 10 MHz channels where there
1346 * may not be an n:1 or 1:n mapping between frequencies and
1347 * channel numbers.
1348 */
1349 return channel;
1350 }
1351
1352 /*
1353 * Use the channel determined through the payload channel number
1354 * instead of the RX channel reported by the driver.
1355 */
1356 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
0172bb75 1357 return NULL;
119f94a6 1358 return alt_channel;
0172bb75
JB		 1359}
1360
0e3a39b5 1361/* Returned bss is reference counted and must be cleaned up appropriately. */
0b8fb823
PX		 1362static struct cfg80211_bss *
1363cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1364 struct cfg80211_inform_bss *data,
1365 enum cfg80211_bss_frame_type ftype,
1366 const u8 *bssid, u64 tsf, u16 capability,
1367 u16 beacon_interval, const u8 *ie, size_t ielen,
0cd01efb 1368 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823 1369 gfp_t gfp)
06aa7afa 1370{
0b8fb823 1371 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
9caf0364 1372 struct cfg80211_bss_ies *ies;
3afc2167 1373 struct ieee80211_channel *channel;
7011ba58 1374 struct cfg80211_internal_bss tmp = {}, *res;
6eb18137 1375 int bss_type;
67af9811 1376 bool signal_valid;
60d7dfea 1377 unsigned long ts;
06aa7afa
JK		 1378
1379 if (WARN_ON(!wiphy))
1380 return NULL;
1381
22fe88d3 1382 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 1383 (data->signal < 0 || data->signal > 100)))
06aa7afa
JK		 1384 return NULL;
1385
119f94a6
JM		 1386 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1387 data->scan_width);
0172bb75
JB		 1388 if (!channel)
1389 return NULL;
1390
9caf0364
JB		 1391 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1392 tmp.pub.channel = channel;
6e19bc4b
DS		 1393 tmp.pub.scan_width = data->scan_width;
1394 tmp.pub.signal = data->signal;
9caf0364
JB		 1395 tmp.pub.beacon_interval = beacon_interval;
1396 tmp.pub.capability = capability;
6e19bc4b 1397 tmp.ts_boottime = data->boottime_ns;
0cd01efb
SS		 1398 if (non_tx_data) {
1399 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
60d7dfea 1400 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
0cd01efb
SS		 1401 tmp.pub.bssid_index = non_tx_data->bssid_index;
1402 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
60d7dfea
JB		 1403 } else {
1404 ts = jiffies;
0cd01efb 1405 }
6e19bc4b 1406
34a6eddb 1407 /*
5bc8c1f2 1408 * If we do not know here whether the IEs are from a Beacon or Probe
34a6eddb
JM		 1409 * Response frame, we need to pick one of the options and only use it
1410 * with the driver that does not provide the full Beacon/Probe Response
1411 * frame. Use Beacon frame pointer to avoid indicating that this should
50521aa8 1412 * override the IEs pointer should we have received an earlier
9caf0364 1413 * indication of Probe Response data.
34a6eddb 1414 */
0e227084 1415 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364
JB		 1416 if (!ies)
1417 return NULL;
1418 ies->len = ielen;
8cef2c9d 1419 ies->tsf = tsf;
0e227084 1420 ies->from_beacon = false;
9caf0364 1421 memcpy(ies->data, ie, ielen);
06aa7afa 1422
5bc8c1f2
JB		 1423 switch (ftype) {
1424 case CFG80211_BSS_FTYPE_BEACON:
1425 ies->from_beacon = true;
925b5978 1426 /* fall through */
5bc8c1f2
JB		 1427 case CFG80211_BSS_FTYPE_UNKNOWN:
1428 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1429 break;
1430 case CFG80211_BSS_FTYPE_PRESP:
1431 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1432 break;
1433 }
9caf0364 1434 rcu_assign_pointer(tmp.pub.ies, ies);
06aa7afa 1435
6e19bc4b 1436 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
67af9811 1437 wiphy->max_adj_channel_rssi_comp;
60d7dfea 1438 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
06aa7afa
JK		 1439 if (!res)
1440 return NULL;
1441
57fbcce3 1442 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1443 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1444 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1445 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1446 regulatory_hint_found_beacon(wiphy, channel, gfp);
1447 } else {
1448 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1449 regulatory_hint_found_beacon(wiphy, channel, gfp);
1450 }
06aa7afa 1451
b0d1d7ff 1452 if (non_tx_data) {
0b8fb823
PX		 1453 /* this is a nontransmitting bss, we need to add it to
1454 * transmitting bss' list if it is not there
1455 */
0cd01efb
SS		 1456 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1457 &res->pub)) {
0b8fb823
PX		 1458 if (__cfg80211_unlink_bss(rdev, res))
1459 rdev->bss_generation++;
1460 }
1461 }
1462
4ee3e063 1463 trace_cfg80211_return_bss(&res->pub);
06aa7afa
JK		 1464 /* cfg80211_bss_update gives us a referenced result */
1465 return &res->pub;
1466}
06aa7afa 1467
fe806e49
SS		 1468static const struct element
1469*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1470 const struct element *mbssid_elem,
1471 const struct element *sub_elem)
1472{
1473 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1474 const struct element *next_mbssid;
1475 const struct element *next_sub;
1476
1477 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1478 mbssid_end,
1479 ielen - (mbssid_end - ie));
1480
1481 /*
1482 * If is is not the last subelement in current MBSSID IE or there isn't
1483 * a next MBSSID IE - profile is complete.
1484 */
1485 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1486 !next_mbssid)
1487 return NULL;
1488
1489 /* For any length error, just return NULL */
1490
1491 if (next_mbssid->datalen < 4)
1492 return NULL;
1493
1494 next_sub = (void *)&next_mbssid->data[1];
1495
1496 if (next_mbssid->data + next_mbssid->datalen <
1497 next_sub->data + next_sub->datalen)
1498 return NULL;
1499
1500 if (next_sub->id != 0 || next_sub->datalen < 2)
1501 return NULL;
1502
1503 /*
1504 * Check if the first element in the next sub element is a start
1505 * of a new profile
1506 */
1507 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1508 NULL : next_mbssid;
1509}
1510
1511size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1512 const struct element *mbssid_elem,
1513 const struct element *sub_elem,
5809a5d5 1514 u8 *merged_ie, size_t max_copy_len)
fe806e49
SS		 1515{
1516 size_t copied_len = sub_elem->datalen;
1517 const struct element *next_mbssid;
1518
1519 if (sub_elem->datalen > max_copy_len)
1520 return 0;
1521
5809a5d5 1522 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
fe806e49
SS		 1523
1524 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1525 mbssid_elem,
1526 sub_elem))) {
1527 const struct element *next_sub = (void *)&next_mbssid->data[1];
1528
1529 if (copied_len + next_sub->datalen > max_copy_len)
1530 break;
5809a5d5 1531 memcpy(merged_ie + copied_len, next_sub->data,
fe806e49
SS		 1532 next_sub->datalen);
1533 copied_len += next_sub->datalen;
1534 }
1535
1536 return copied_len;
1537}
1538EXPORT_SYMBOL(cfg80211_merge_profile);
1539
0b8fb823
PX		 1540static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1541 struct cfg80211_inform_bss *data,
1542 enum cfg80211_bss_frame_type ftype,
1543 const u8 *bssid, u64 tsf,
1544 u16 beacon_interval, const u8 *ie,
1545 size_t ielen,
0cd01efb 1546 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 1547 gfp_t gfp)
1548{
1c8745f3
JB		 1549 const u8 *mbssid_index_ie;
1550 const struct element *elem, *sub;
1551 size_t new_ie_len;
0b8fb823 1552 u8 new_bssid[ETH_ALEN];
fe806e49
SS		 1553 u8 *new_ie, *profile;
1554 u64 seen_indices = 0;
0b8fb823
PX		 1555 u16 capability;
1556 struct cfg80211_bss *bss;
1557
0cd01efb 1558 if (!non_tx_data)
0b8fb823
PX		 1559 return;
1560 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1561 return;
213ed579
SS		 1562 if (!wiphy->support_mbssid)
1563 return;
1564 if (wiphy->support_only_he_mbssid &&
1565 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1566 return;
0b8fb823 1567
0b8fb823
PX		 1568 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1569 if (!new_ie)
1570 return;
1571
fe806e49
SS		 1572 profile = kmalloc(ielen, gfp);
1573 if (!profile)
1574 goto out;
1575
1c8745f3
JB		 1576 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1577 if (elem->datalen < 4)
1578 continue;
1579 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
fe806e49
SS		 1580 u8 profile_len;
1581
1c8745f3 1582 if (sub->id != 0 || sub->datalen < 4) {
0b8fb823
PX		 1583 /* not a valid BSS profile */
1584 continue;
1585 }
1586
1c8745f3
JB		 1587 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1588 sub->data[1] != 2) {
0b8fb823
PX		 1589 /* The first element within the Nontransmitted
1590 * BSSID Profile is not the Nontransmitted
1591 * BSSID Capability element.
1592 */
1593 continue;
1594 }
1595
fe806e49
SS		 1596 memset(profile, 0, ielen);
1597 profile_len = cfg80211_merge_profile(ie, ielen,
1598 elem,
1599 sub,
5809a5d5 1600 profile,
fe806e49
SS		 1601 ielen);
1602
0b8fb823
PX		 1603 /* found a Nontransmitted BSSID Profile */
1604 mbssid_index_ie = cfg80211_find_ie
1605 (WLAN_EID_MULTI_BSSID_IDX,
fe806e49 1606 profile, profile_len);
0b8fb823 1607 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
fe806e49
SS		 1608 mbssid_index_ie[2] == 0 ||
1609 mbssid_index_ie[2] > 46) {
0b8fb823
PX		 1610 /* No valid Multiple BSSID-Index element */
1611 continue;
1612 }
1613
ebb3ca3b 1614 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
fe806e49
SS		 1615 /* We don't support legacy split of a profile */
1616 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1617 mbssid_index_ie[2]);
1618
ebb3ca3b 1619 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
fe806e49 1620
0cd01efb
SS		 1621 non_tx_data->bssid_index = mbssid_index_ie[2];
1622 non_tx_data->max_bssid_indicator = elem->data[0];
1623
1624 cfg80211_gen_new_bssid(bssid,
1625 non_tx_data->max_bssid_indicator,
1626 non_tx_data->bssid_index,
0b8fb823
PX		 1627 new_bssid);
1628 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
fe806e49
SS		 1629 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1630 profile,
1631 profile_len, new_ie,
0b8fb823
PX		 1632 gfp);
1633 if (!new_ie_len)
1634 continue;
1635
fe806e49 1636 capability = get_unaligned_le16(profile + 2);
0b8fb823
PX		 1637 bss = cfg80211_inform_single_bss_data(wiphy, data,
1638 ftype,
1639 new_bssid, tsf,
1640 capability,
1641 beacon_interval,
1642 new_ie,
1643 new_ie_len,
0cd01efb
SS		 1644 non_tx_data,
1645 gfp);
0b8fb823
PX		 1646 if (!bss)
1647 break;
1648 cfg80211_put_bss(wiphy, bss);
1649 }
0b8fb823
PX		 1650 }
1651
fe806e49 1652out:
0b8fb823 1653 kfree(new_ie);
fe806e49 1654 kfree(profile);
0b8fb823
PX		 1655}
1656
2a519311 1657struct cfg80211_bss *
0b8fb823
PX		 1658cfg80211_inform_bss_data(struct wiphy *wiphy,
1659 struct cfg80211_inform_bss *data,
1660 enum cfg80211_bss_frame_type ftype,
1661 const u8 *bssid, u64 tsf, u16 capability,
1662 u16 beacon_interval, const u8 *ie, size_t ielen,
1663 gfp_t gfp)
1664{
1665 struct cfg80211_bss *res;
0cd01efb 1666 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 1667
1668 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1669 capability, beacon_interval, ie,
1670 ielen, NULL, gfp);
b0d1d7ff
JB		 1671 if (!res)
1672 return NULL;
0cd01efb 1673 non_tx_data.tx_bss = res;
0b8fb823 1674 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
0cd01efb
SS		 1675 beacon_interval, ie, ielen, &non_tx_data,
1676 gfp);
0b8fb823
PX		 1677 return res;
1678}
1679EXPORT_SYMBOL(cfg80211_inform_bss_data);
1680
1681static void
1682cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1683 struct cfg80211_inform_bss *data,
1684 struct ieee80211_mgmt *mgmt, size_t len,
0cd01efb 1685 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 1686 gfp_t gfp)
1687{
1688 enum cfg80211_bss_frame_type ftype;
1689 const u8 *ie = mgmt->u.probe_resp.variable;
1690 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1691 u.probe_resp.variable);
1692
1693 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1694 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1695
1696 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1697 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1698 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
0cd01efb 1699 ie, ielen, non_tx_data, gfp);
0b8fb823
PX		 1700}
1701
1702static void
1703cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
7011ba58 1704 struct cfg80211_bss *nontrans_bss,
461c4c2b 1705 struct ieee80211_mgmt *mgmt, size_t len)
0b8fb823
PX		 1706{
1707 u8 *ie, *new_ie, *pos;
1708 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1709 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1710 u.probe_resp.variable);
1711 size_t new_ie_len;
1712 struct cfg80211_bss_ies *new_ies;
1713 const struct cfg80211_bss_ies *old;
1714 u8 cpy_len;
1715
461c4c2b
SS		 1716 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
1717
0b8fb823
PX		 1718 ie = mgmt->u.probe_resp.variable;
1719
1720 new_ie_len = ielen;
1721 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1722 if (!trans_ssid)
1723 return;
1724 new_ie_len -= trans_ssid[1];
1725 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
242b0931
JB		 1726 /*
1727 * It's not valid to have the MBSSID element before SSID
1728 * ignore if that happens - the code below assumes it is
1729 * after (while copying things inbetween).
1730 */
1731 if (!mbssid || mbssid < trans_ssid)
0b8fb823
PX		 1732 return;
1733 new_ie_len -= mbssid[1];
461c4c2b 1734
7011ba58 1735 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
461c4c2b 1736 if (!nontrans_ssid)
0b8fb823 1737 return;
461c4c2b 1738
0b8fb823 1739 new_ie_len += nontrans_ssid[1];
0b8fb823
PX		 1740
1741 /* generate new ie for nontrans BSS
1742 * 1. replace SSID with nontrans BSS' SSID
1743 * 2. skip MBSSID IE
1744 */
461c4c2b 1745 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
0b8fb823
PX		 1746 if (!new_ie)
1747 return;
461c4c2b
SS		 1748
1749 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
bede8d29
SS		 1750 if (!new_ies)
1751 goto out_free;
0b8fb823
PX		 1752
1753 pos = new_ie;
1754
1755 /* copy the nontransmitted SSID */
1756 cpy_len = nontrans_ssid[1] + 2;
1757 memcpy(pos, nontrans_ssid, cpy_len);
1758 pos += cpy_len;
1759 /* copy the IEs between SSID and MBSSID */
1760 cpy_len = trans_ssid[1] + 2;
1761 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1762 pos += (mbssid - (trans_ssid + cpy_len));
1763 /* copy the IEs after MBSSID */
1764 cpy_len = mbssid[1] + 2;
1765 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1766
1767 /* update ie */
1768 new_ies->len = new_ie_len;
1769 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1770 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1771 memcpy(new_ies->data, new_ie, new_ie_len);
1772 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
7011ba58
SS		 1773 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1774 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1775 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 1776 if (old)
1777 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1778 } else {
7011ba58
SS		 1779 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1780 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1781 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 1782 if (old)
1783 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1784 }
bede8d29
SS		 1785
1786out_free:
1787 kfree(new_ie);
0b8fb823 1788}
6e19bc4b 1789
0b8fb823
PX		 1790/* cfg80211_inform_bss_width_frame helper */
1791static struct cfg80211_bss *
1792cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1793 struct cfg80211_inform_bss *data,
1794 struct ieee80211_mgmt *mgmt, size_t len,
0b8fb823 1795 gfp_t gfp)
2a519311 1796{
9caf0364
JB		 1797 struct cfg80211_internal_bss tmp = {}, *res;
1798 struct cfg80211_bss_ies *ies;
3afc2167 1799 struct ieee80211_channel *channel;
67af9811 1800 bool signal_valid;
2a519311
JB		 1801 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1802 u.probe_resp.variable);
6eb18137 1803 int bss_type;
bef9bacc 1804
0172bb75
JB		 1805 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1806 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1807
6e19bc4b 1808 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
4ee3e063 1809
bef9bacc
MK		 1810 if (WARN_ON(!mgmt))
1811 return NULL;
1812
1813 if (WARN_ON(!wiphy))
1814 return NULL;
2a519311 1815
22fe88d3 1816 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 1817 (data->signal < 0 || data->signal > 100)))
2a519311
JB		 1818 return NULL;
1819
bef9bacc 1820 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
2a519311
JB		 1821 return NULL;
1822
0172bb75 1823 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
119f94a6 1824 ielen, data->chan, data->scan_width);
0172bb75
JB		 1825 if (!channel)
1826 return NULL;
1827
0e227084 1828 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364 1829 if (!ies)
2a519311 1830 return NULL;
9caf0364 1831 ies->len = ielen;
8cef2c9d 1832 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
0e227084 1833 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
9caf0364 1834 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
2a519311 1835
9caf0364
JB		 1836 if (ieee80211_is_probe_resp(mgmt->frame_control))
1837 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1838 else
1839 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1840 rcu_assign_pointer(tmp.pub.ies, ies);
505a2e88 1841
9caf0364
JB		 1842 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1843 tmp.pub.channel = channel;
6e19bc4b
DS		 1844 tmp.pub.scan_width = data->scan_width;
1845 tmp.pub.signal = data->signal;
9caf0364
JB		 1846 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1847 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
6e19bc4b 1848 tmp.ts_boottime = data->boottime_ns;
1d76250b 1849 tmp.parent_tsf = data->parent_tsf;
983dafaa
SD		 1850 tmp.pub.chains = data->chains;
1851 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1d76250b 1852 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
9caf0364 1853
6e19bc4b 1854 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
67af9811 1855 wiphy->max_adj_channel_rssi_comp;
a3ce17d1
CT		 1856 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1857 jiffies);
2a519311
JB		 1858 if (!res)
1859 return NULL;
1860
57fbcce3 1861 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1862 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1863 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1864 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1865 regulatory_hint_found_beacon(wiphy, channel, gfp);
1866 } else {
1867 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1868 regulatory_hint_found_beacon(wiphy, channel, gfp);
1869 }
e38f8a7a 1870
4ee3e063 1871 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 1872 /* cfg80211_bss_update gives us a referenced result */
1873 return &res->pub;
1874}
0b8fb823
PX		 1875
1876struct cfg80211_bss *
1877cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1878 struct cfg80211_inform_bss *data,
1879 struct ieee80211_mgmt *mgmt, size_t len,
1880 gfp_t gfp)
1881{
7011ba58 1882 struct cfg80211_bss *res, *tmp_bss;
0b8fb823
PX		 1883 const u8 *ie = mgmt->u.probe_resp.variable;
1884 const struct cfg80211_bss_ies *ies1, *ies2;
1885 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1886 u.probe_resp.variable);
0cd01efb 1887 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 1888
1889 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
84f1772b 1890 len, gfp);
213ed579
SS		 1891 if (!res || !wiphy->support_mbssid ||
1892 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1893 return res;
1894 if (wiphy->support_only_he_mbssid &&
1895 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
0b8fb823
PX		 1896 return res;
1897
0cd01efb 1898 non_tx_data.tx_bss = res;
0b8fb823 1899 /* process each non-transmitting bss */
0cd01efb
SS		 1900 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1901 &non_tx_data, gfp);
0b8fb823 1902
461c4c2b
SS		 1903 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1904
0b8fb823
PX		 1905 /* check if the res has other nontransmitting bss which is not
1906 * in MBSSID IE
1907 */
1908 ies1 = rcu_access_pointer(res->ies);
0b8fb823
PX		 1909
1910 /* go through nontrans_list, if the timestamp of the BSS is
1911 * earlier than the timestamp of the transmitting BSS then
1912 * update it
1913 */
7011ba58 1914 list_for_each_entry(tmp_bss, &res->nontrans_list,
0b8fb823 1915 nontrans_list) {
7011ba58 1916 ies2 = rcu_access_pointer(tmp_bss->ies);
0b8fb823
PX		 1917 if (ies2->tsf < ies1->tsf)
1918 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
461c4c2b 1919 mgmt, len);
0b8fb823 1920 }
461c4c2b 1921 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
0b8fb823
PX		 1922
1923 return res;
1924}
6e19bc4b 1925EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2a519311 1926
5b112d3d 1927void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
4c0c0b75 1928{
f26cbf40 1929 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
4c0c0b75
JB		 1930 struct cfg80211_internal_bss *bss;
1931
1932 if (!pub)
1933 return;
1934
1935 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 1936
1b8ec87a
ZG		 1937 spin_lock_bh(&rdev->bss_lock);
1938 bss_ref_get(rdev, bss);
1939 spin_unlock_bh(&rdev->bss_lock);
4c0c0b75
JB		 1940}
1941EXPORT_SYMBOL(cfg80211_ref_bss);
1942
5b112d3d 1943void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2a519311 1944{
f26cbf40 1945 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311
JB		 1946 struct cfg80211_internal_bss *bss;
1947
1948 if (!pub)
1949 return;
1950
1951 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 1952
1b8ec87a
ZG		 1953 spin_lock_bh(&rdev->bss_lock);
1954 bss_ref_put(rdev, bss);
1955 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 1956}
1957EXPORT_SYMBOL(cfg80211_put_bss);
1958
d491af19
JB		 1959void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1960{
f26cbf40 1961 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
7011ba58
SS		 1962 struct cfg80211_internal_bss *bss, *tmp1;
1963 struct cfg80211_bss *nontrans_bss, *tmp;
d491af19
JB		 1964
1965 if (WARN_ON(!pub))
1966 return;
1967
1968 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1969
1b8ec87a 1970 spin_lock_bh(&rdev->bss_lock);
7011ba58
SS		 1971 if (list_empty(&bss->list))
1972 goto out;
1973
1974 list_for_each_entry_safe(nontrans_bss, tmp,
1975 &pub->nontrans_list,
1976 nontrans_list) {
1977 tmp1 = container_of(nontrans_bss,
1978 struct cfg80211_internal_bss, pub);
1979 if (__cfg80211_unlink_bss(rdev, tmp1))
1b8ec87a 1980 rdev->bss_generation++;
3207390a 1981 }
7011ba58
SS		 1982
1983 if (__cfg80211_unlink_bss(rdev, bss))
1984 rdev->bss_generation++;
1985out:
1b8ec87a 1986 spin_unlock_bh(&rdev->bss_lock);
d491af19
JB		 1987}
1988EXPORT_SYMBOL(cfg80211_unlink_bss);
1989
4770c8f9
IP		 1990void cfg80211_bss_iter(struct wiphy *wiphy,
1991 struct cfg80211_chan_def *chandef,
1992 void (*iter)(struct wiphy *wiphy,
1993 struct cfg80211_bss *bss,
1994 void *data),
1995 void *iter_data)
1996{
1997 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1998 struct cfg80211_internal_bss *bss;
1999
2000 spin_lock_bh(&rdev->bss_lock);
2001
2002 list_for_each_entry(bss, &rdev->bss_list, list) {
2003 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2004 iter(wiphy, &bss->pub, iter_data);
2005 }
2006
2007 spin_unlock_bh(&rdev->bss_lock);
2008}
2009EXPORT_SYMBOL(cfg80211_bss_iter);
2010
0afd425b
SM		 2011void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2012 struct ieee80211_channel *chan)
2013{
2014 struct wiphy *wiphy = wdev->wiphy;
2015 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2016 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2017 struct cfg80211_internal_bss *new = NULL;
2018 struct cfg80211_internal_bss *bss;
2019 struct cfg80211_bss *nontrans_bss;
2020 struct cfg80211_bss *tmp;
2021
2022 spin_lock_bh(&rdev->bss_lock);
2023
2024 if (WARN_ON(cbss->pub.channel == chan))
2025 goto done;
2026
2027 /* use transmitting bss */
2028 if (cbss->pub.transmitted_bss)
2029 cbss = container_of(cbss->pub.transmitted_bss,
2030 struct cfg80211_internal_bss,
2031 pub);
2032
2033 cbss->pub.channel = chan;
2034
2035 list_for_each_entry(bss, &rdev->bss_list, list) {
2036 if (!cfg80211_bss_type_match(bss->pub.capability,
2037 bss->pub.channel->band,
2038 wdev->conn_bss_type))
2039 continue;
2040
2041 if (bss == cbss)
2042 continue;
2043
2044 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2045 new = bss;
2046 break;
2047 }
2048 }
2049
2050 if (new) {
2051 /* to save time, update IEs for transmitting bss only */
2052 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2053 new->pub.proberesp_ies = NULL;
2054 new->pub.beacon_ies = NULL;
2055 }
2056
2057 list_for_each_entry_safe(nontrans_bss, tmp,
2058 &new->pub.nontrans_list,
2059 nontrans_list) {
2060 bss = container_of(nontrans_bss,
2061 struct cfg80211_internal_bss, pub);
2062 if (__cfg80211_unlink_bss(rdev, bss))
2063 rdev->bss_generation++;
2064 }
2065
2066 WARN_ON(atomic_read(&new->hold));
2067 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2068 rdev->bss_generation++;
2069 }
2070
2071 rb_erase(&cbss->rbn, &rdev->bss_tree);
2072 rb_insert_bss(rdev, cbss);
2073 rdev->bss_generation++;
2074
2075 list_for_each_entry_safe(nontrans_bss, tmp,
2076 &cbss->pub.nontrans_list,
2077 nontrans_list) {
2078 bss = container_of(nontrans_bss,
2079 struct cfg80211_internal_bss, pub);
2080 bss->pub.channel = chan;
2081 rb_erase(&bss->rbn, &rdev->bss_tree);
2082 rb_insert_bss(rdev, bss);
2083 rdev->bss_generation++;
2084 }
2085
2086done:
2087 spin_unlock_bh(&rdev->bss_lock);
2088}
2089
3d23e349 2090#ifdef CONFIG_CFG80211_WEXT
9f419f38
JB		 2091static struct cfg80211_registered_device *
2092cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2093{
5fe231e8 2094 struct cfg80211_registered_device *rdev;
9f419f38
JB		 2095 struct net_device *dev;
2096
5fe231e8
JB		 2097 ASSERT_RTNL();
2098
9f419f38
JB		 2099 dev = dev_get_by_index(net, ifindex);
2100 if (!dev)
5fe231e8
JB		 2101 return ERR_PTR(-ENODEV);
2102 if (dev->ieee80211_ptr)
f26cbf40 2103 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
5fe231e8 2104 else
9f419f38
JB		 2105 rdev = ERR_PTR(-ENODEV);
2106 dev_put(dev);
9f419f38
JB		 2107 return rdev;
2108}
2109
2a519311
JB		 2110int cfg80211_wext_siwscan(struct net_device *dev,
2111 struct iw_request_info *info,
2112 union iwreq_data *wrqu, char *extra)
2113{
2114 struct cfg80211_registered_device *rdev;
2115 struct wiphy *wiphy;
2116 struct iw_scan_req *wreq = NULL;
65486c8b 2117 struct cfg80211_scan_request *creq = NULL;
2a519311 2118 int i, err, n_channels = 0;
57fbcce3 2119 enum nl80211_band band;
2a519311
JB		 2120
2121 if (!netif_running(dev))
2122 return -ENETDOWN;
2123
b2e3abdc
HS		 2124 if (wrqu->data.length == sizeof(struct iw_scan_req))
2125 wreq = (struct iw_scan_req *)extra;
2126
463d0183 2127 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 2128
2129 if (IS_ERR(rdev))
2130 return PTR_ERR(rdev);
2131
f9d15d16 2132 if (rdev->scan_req || rdev->scan_msg) {
2a519311
JB		 2133 err = -EBUSY;
2134 goto out;
2135 }
2136
2137 wiphy = &rdev->wiphy;
2138
b2e3abdc
HS		 2139 /* Determine number of channels, needed to allocate creq */
2140 if (wreq && wreq->num_channels)
2141 n_channels = wreq->num_channels;
bdfbec2d
IP		 2142 else
2143 n_channels = ieee80211_get_num_supported_channels(wiphy);
2a519311
JB		 2144
2145 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2146 n_channels * sizeof(void *),
2147 GFP_ATOMIC);
2148 if (!creq) {
2149 err = -ENOMEM;
2150 goto out;
2151 }
2152
2153 creq->wiphy = wiphy;
fd014284 2154 creq->wdev = dev->ieee80211_ptr;
5ba63533
JB		 2155 /* SSIDs come after channels */
2156 creq->ssids = (void *)&creq->channels[n_channels];
2a519311
JB		 2157 creq->n_channels = n_channels;
2158 creq->n_ssids = 1;
15d6030b 2159 creq->scan_start = jiffies;
2a519311 2160
b2e3abdc 2161 /* translate "Scan on frequencies" request */
2a519311 2162 i = 0;
57fbcce3 2163 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2a519311 2164 int j;
584991dc 2165
2a519311
JB		 2166 if (!wiphy->bands[band])
2167 continue;
584991dc 2168
2a519311 2169 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
584991dc
JB		 2170 /* ignore disabled channels */
2171 if (wiphy->bands[band]->channels[j].flags &
2172 IEEE80211_CHAN_DISABLED)
2173 continue;
b2e3abdc
HS		 2174
2175 /* If we have a wireless request structure and the
2176 * wireless request specifies frequencies, then search
2177 * for the matching hardware channel.
2178 */
2179 if (wreq && wreq->num_channels) {
2180 int k;
2181 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2182 for (k = 0; k < wreq->num_channels; k++) {
96998e3a
ZG		 2183 struct iw_freq *freq =
2184 &wreq->channel_list[k];
2185 int wext_freq =
2186 cfg80211_wext_freq(freq);
2187
b2e3abdc
HS		 2188 if (wext_freq == wiphy_freq)
2189 goto wext_freq_found;
2190 }
2191 goto wext_freq_not_found;
2192 }
2193
2194 wext_freq_found:
2a519311
JB		 2195 creq->channels[i] = &wiphy->bands[band]->channels[j];
2196 i++;
b2e3abdc 2197 wext_freq_not_found: ;
2a519311
JB		 2198 }
2199 }
8862dc5f
HS		 2200 /* No channels found? */
2201 if (!i) {
2202 err = -EINVAL;
2203 goto out;
2204 }
2a519311 2205
b2e3abdc
HS		 2206 /* Set real number of channels specified in creq->channels[] */
2207 creq->n_channels = i;
2a519311 2208
b2e3abdc
HS		 2209 /* translate "Scan for SSID" request */
2210 if (wreq) {
2a519311 2211 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
65486c8b
JB		 2212 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2213 err = -EINVAL;
2214 goto out;
2215 }
2a519311
JB		 2216 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2217 creq->ssids[0].ssid_len = wreq->essid_len;
2218 }
2219 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2220 creq->n_ssids = 0;
2221 }
2222
57fbcce3 2223 for (i = 0; i < NUM_NL80211_BANDS; i++)
a401d2bb
JB		 2224 if (wiphy->bands[i])
2225 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
34850ab2 2226
818965d3
JM		 2227 eth_broadcast_addr(creq->bssid);
2228
2a519311 2229 rdev->scan_req = creq;
e35e4d28 2230 err = rdev_scan(rdev, creq);
2a519311
JB		 2231 if (err) {
2232 rdev->scan_req = NULL;
65486c8b 2233 /* creq will be freed below */
463d0183 2234 } else {
fd014284 2235 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
65486c8b
JB		 2236 /* creq now owned by driver */
2237 creq = NULL;
463d0183
JB		 2238 dev_hold(dev);
2239 }
2a519311 2240 out:
65486c8b 2241 kfree(creq);
2a519311
JB		 2242 return err;
2243}
2afe38d1 2244EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2a519311 2245
76a70e9c
JM		 2246static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2247 const struct cfg80211_bss_ies *ies,
2248 char *current_ev, char *end_buf)
2a519311 2249{
9caf0364 2250 const u8 *pos, *end, *next;
2a519311
JB		 2251 struct iw_event iwe;
2252
9caf0364 2253 if (!ies)
76a70e9c 2254 return current_ev;
2a519311
JB		 2255
2256 /*
2257 * If needed, fragment the IEs buffer (at IE boundaries) into short
2258 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2259 */
9caf0364
JB		 2260 pos = ies->data;
2261 end = pos + ies->len;
2a519311
JB		 2262
2263 while (end - pos > IW_GENERIC_IE_MAX) {
2264 next = pos + 2 + pos[1];
2265 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2266 next = next + 2 + next[1];
2267
2268 memset(&iwe, 0, sizeof(iwe));
2269 iwe.cmd = IWEVGENIE;
2270 iwe.u.data.length = next - pos;
76a70e9c
JM		 2271 current_ev = iwe_stream_add_point_check(info, current_ev,
2272 end_buf, &iwe,
2273 (void *)pos);
2274 if (IS_ERR(current_ev))
2275 return current_ev;
2a519311
JB		 2276 pos = next;
2277 }
2278
2279 if (end > pos) {
2280 memset(&iwe, 0, sizeof(iwe));
2281 iwe.cmd = IWEVGENIE;
2282 iwe.u.data.length = end - pos;
76a70e9c
JM		 2283 current_ev = iwe_stream_add_point_check(info, current_ev,
2284 end_buf, &iwe,
2285 (void *)pos);
2286 if (IS_ERR(current_ev))
2287 return current_ev;
2a519311 2288 }
76a70e9c
JM		 2289
2290 return current_ev;
2a519311
JB		 2291}
2292
2a519311 2293static char *
77965c97
JB		 2294ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2295 struct cfg80211_internal_bss *bss, char *current_ev,
2296 char *end_buf)
2a519311 2297{
9caf0364 2298 const struct cfg80211_bss_ies *ies;
2a519311 2299 struct iw_event iwe;
9caf0364 2300 const u8 *ie;
76a70e9c
JM		 2301 u8 buf[50];
2302 u8 *cfg, *p, *tmp;
9caf0364 2303 int rem, i, sig;
2a519311
JB		 2304 bool ismesh = false;
2305
2306 memset(&iwe, 0, sizeof(iwe));
2307 iwe.cmd = SIOCGIWAP;
2308 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2309 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
76a70e9c
JM		 2310 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2311 IW_EV_ADDR_LEN);
2312 if (IS_ERR(current_ev))
2313 return current_ev;
2a519311
JB		 2314
2315 memset(&iwe, 0, sizeof(iwe));
2316 iwe.cmd = SIOCGIWFREQ;
2317 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2318 iwe.u.freq.e = 0;
76a70e9c
JM		 2319 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2320 IW_EV_FREQ_LEN);
2321 if (IS_ERR(current_ev))
2322 return current_ev;
2a519311
JB		 2323
2324 memset(&iwe, 0, sizeof(iwe));
2325 iwe.cmd = SIOCGIWFREQ;
2326 iwe.u.freq.m = bss->pub.channel->center_freq;
2327 iwe.u.freq.e = 6;
76a70e9c
JM		 2328 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2329 IW_EV_FREQ_LEN);
2330 if (IS_ERR(current_ev))
2331 return current_ev;
2a519311 2332
77965c97 2333 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 2334 memset(&iwe, 0, sizeof(iwe));
2335 iwe.cmd = IWEVQUAL;
2336 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2337 IW_QUAL_NOISE_INVALID |
a77b8552 2338 IW_QUAL_QUAL_UPDATED;
77965c97 2339 switch (wiphy->signal_type) {
2a519311 2340 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 2341 sig = bss->pub.signal / 100;
2342 iwe.u.qual.level = sig;
2a519311 2343 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 2344 if (sig < -110) /* rather bad */
2345 sig = -110;
2346 else if (sig > -40) /* perfect */
2347 sig = -40;
2348 /* will give a range of 0 .. 70 */
2349 iwe.u.qual.qual = sig + 110;
2a519311
JB		 2350 break;
2351 case CFG80211_SIGNAL_TYPE_UNSPEC:
2352 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 2353 /* will give range 0 .. 100 */
2354 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 2355 break;
2356 default:
2357 /* not reached */
2358 break;
2359 }
76a70e9c
JM		 2360 current_ev = iwe_stream_add_event_check(info, current_ev,
2361 end_buf, &iwe,
2362 IW_EV_QUAL_LEN);
2363 if (IS_ERR(current_ev))
2364 return current_ev;
2a519311
JB		 2365 }
2366
2367 memset(&iwe, 0, sizeof(iwe));
2368 iwe.cmd = SIOCGIWENCODE;
2369 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2370 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2371 else
2372 iwe.u.data.flags = IW_ENCODE_DISABLED;
2373 iwe.u.data.length = 0;
76a70e9c
JM		 2374 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2375 &iwe, "");
2376 if (IS_ERR(current_ev))
2377 return current_ev;
2a519311 2378
9caf0364
JB		 2379 rcu_read_lock();
2380 ies = rcu_dereference(bss->pub.ies);
83c7aa1a
JB		 2381 rem = ies->len;
2382 ie = ies->data;
9caf0364 2383
83c7aa1a 2384 while (rem >= 2) {
2a519311
JB		 2385 /* invalid data */
2386 if (ie[1] > rem - 2)
2387 break;
2388
2389 switch (ie[0]) {
2390 case WLAN_EID_SSID:
2391 memset(&iwe, 0, sizeof(iwe));
2392 iwe.cmd = SIOCGIWESSID;
2393 iwe.u.data.length = ie[1];
2394 iwe.u.data.flags = 1;
76a70e9c
JM		 2395 current_ev = iwe_stream_add_point_check(info,
2396 current_ev,
2397 end_buf, &iwe,
2398 (u8 *)ie + 2);
2399 if (IS_ERR(current_ev))
2400 goto unlock;
2a519311
JB		 2401 break;
2402 case WLAN_EID_MESH_ID:
2403 memset(&iwe, 0, sizeof(iwe));
2404 iwe.cmd = SIOCGIWESSID;
2405 iwe.u.data.length = ie[1];
2406 iwe.u.data.flags = 1;
76a70e9c
JM		 2407 current_ev = iwe_stream_add_point_check(info,
2408 current_ev,
2409 end_buf, &iwe,
2410 (u8 *)ie + 2);
2411 if (IS_ERR(current_ev))
2412 goto unlock;
2a519311
JB		 2413 break;
2414 case WLAN_EID_MESH_CONFIG:
2415 ismesh = true;
136cfa28 2416 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2a519311 2417 break;
9caf0364 2418 cfg = (u8 *)ie + 2;
2a519311
JB		 2419 memset(&iwe, 0, sizeof(iwe));
2420 iwe.cmd = IWEVCUSTOM;
76aa5e70
RP		 2421 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2422 "0x%02X", cfg[0]);
2a519311 2423 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2424 current_ev = iwe_stream_add_point_check(info,
2425 current_ev,
2426 end_buf,
2427 &iwe, buf);
2428 if (IS_ERR(current_ev))
2429 goto unlock;
76aa5e70
RP		 2430 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2431 cfg[1]);
2a519311 2432 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2433 current_ev = iwe_stream_add_point_check(info,
2434 current_ev,
2435 end_buf,
2436 &iwe, buf);
2437 if (IS_ERR(current_ev))
2438 goto unlock;
76aa5e70
RP		 2439 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2440 cfg[2]);
2a519311 2441 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2442 current_ev = iwe_stream_add_point_check(info,
2443 current_ev,
2444 end_buf,
2445 &iwe, buf);
2446 if (IS_ERR(current_ev))
2447 goto unlock;
76aa5e70 2448 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2a519311 2449 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2450 current_ev = iwe_stream_add_point_check(info,
2451 current_ev,
2452 end_buf,
2453 &iwe, buf);
2454 if (IS_ERR(current_ev))
2455 goto unlock;
76aa5e70
RP		 2456 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2457 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2458 current_ev = iwe_stream_add_point_check(info,
2459 current_ev,
2460 end_buf,
2461 &iwe, buf);
2462 if (IS_ERR(current_ev))
2463 goto unlock;
76aa5e70
RP		 2464 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2465 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2466 current_ev = iwe_stream_add_point_check(info,
2467 current_ev,
2468 end_buf,
2469 &iwe, buf);
2470 if (IS_ERR(current_ev))
2471 goto unlock;
76aa5e70 2472 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2a519311 2473 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2474 current_ev = iwe_stream_add_point_check(info,
2475 current_ev,
2476 end_buf,
2477 &iwe, buf);
2478 if (IS_ERR(current_ev))
2479 goto unlock;
2a519311
JB		 2480 break;
2481 case WLAN_EID_SUPP_RATES:
2482 case WLAN_EID_EXT_SUPP_RATES:
2483 /* display all supported rates in readable format */
2484 p = current_ev + iwe_stream_lcp_len(info);
2485
2486 memset(&iwe, 0, sizeof(iwe));
2487 iwe.cmd = SIOCGIWRATE;
2488 /* Those two flags are ignored... */
2489 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2490
2491 for (i = 0; i < ie[1]; i++) {
2492 iwe.u.bitrate.value =
2493 ((ie[i + 2] & 0x7f) * 500000);
76a70e9c 2494 tmp = p;
2a519311 2495 p = iwe_stream_add_value(info, current_ev, p,
76a70e9c
JM		 2496 end_buf, &iwe,
2497 IW_EV_PARAM_LEN);
2498 if (p == tmp) {
2499 current_ev = ERR_PTR(-E2BIG);
2500 goto unlock;
2501 }
2a519311
JB		 2502 }
2503 current_ev = p;
2504 break;
2505 }
2506 rem -= ie[1] + 2;
2507 ie += ie[1] + 2;
2508 }
2509
f64f9e71
JP		 2510 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2511 ismesh) {
2a519311
JB		 2512 memset(&iwe, 0, sizeof(iwe));
2513 iwe.cmd = SIOCGIWMODE;
2514 if (ismesh)
2515 iwe.u.mode = IW_MODE_MESH;
2516 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2517 iwe.u.mode = IW_MODE_MASTER;
2518 else
2519 iwe.u.mode = IW_MODE_ADHOC;
76a70e9c
JM		 2520 current_ev = iwe_stream_add_event_check(info, current_ev,
2521 end_buf, &iwe,
2522 IW_EV_UINT_LEN);
2523 if (IS_ERR(current_ev))
2524 goto unlock;
2a519311
JB		 2525 }
2526
76a70e9c
JM		 2527 memset(&iwe, 0, sizeof(iwe));
2528 iwe.cmd = IWEVCUSTOM;
2529 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2530 iwe.u.data.length = strlen(buf);
2531 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2532 &iwe, buf);
2533 if (IS_ERR(current_ev))
2534 goto unlock;
2535 memset(&iwe, 0, sizeof(iwe));
2536 iwe.cmd = IWEVCUSTOM;
2537 sprintf(buf, " Last beacon: %ums ago",
2538 elapsed_jiffies_msecs(bss->ts));
2539 iwe.u.data.length = strlen(buf);
2540 current_ev = iwe_stream_add_point_check(info, current_ev,
2541 end_buf, &iwe, buf);
2542 if (IS_ERR(current_ev))
2543 goto unlock;
2544
2545 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2546
2547 unlock:
9caf0364 2548 rcu_read_unlock();
2a519311
JB		 2549 return current_ev;
2550}
2551
2552
1b8ec87a 2553static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2a519311
JB		 2554 struct iw_request_info *info,
2555 char *buf, size_t len)
2556{
2557 char *current_ev = buf;
2558 char *end_buf = buf + len;
2559 struct cfg80211_internal_bss *bss;
76a70e9c 2560 int err = 0;
2a519311 2561
1b8ec87a
ZG		 2562 spin_lock_bh(&rdev->bss_lock);
2563 cfg80211_bss_expire(rdev);
2a519311 2564
1b8ec87a 2565 list_for_each_entry(bss, &rdev->bss_list, list) {
2a519311 2566 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
76a70e9c
JM		 2567 err = -E2BIG;
2568 break;
2a519311 2569 }
1b8ec87a 2570 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
77965c97 2571 current_ev, end_buf);
76a70e9c
JM		 2572 if (IS_ERR(current_ev)) {
2573 err = PTR_ERR(current_ev);
2574 break;
2575 }
2a519311 2576 }
1b8ec87a 2577 spin_unlock_bh(&rdev->bss_lock);
76a70e9c
JM		 2578
2579 if (err)
2580 return err;
2a519311
JB		 2581 return current_ev - buf;
2582}
2583
2584
2585int cfg80211_wext_giwscan(struct net_device *dev,
2586 struct iw_request_info *info,
2587 struct iw_point *data, char *extra)
2588{
2589 struct cfg80211_registered_device *rdev;
2590 int res;
2591
2592 if (!netif_running(dev))
2593 return -ENETDOWN;
2594
463d0183 2595 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 2596
2597 if (IS_ERR(rdev))
2598 return PTR_ERR(rdev);
2599
f9d15d16 2600 if (rdev->scan_req || rdev->scan_msg)
5fe231e8 2601 return -EAGAIN;
2a519311
JB		 2602
2603 res = ieee80211_scan_results(rdev, info, extra, data->length);
2604 data->length = 0;
2605 if (res >= 0) {
2606 data->length = res;
2607 res = 0;
2608 }
2609
2a519311
JB		 2610 return res;
2611}
2afe38d1 2612EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2a519311 2613#endif
Linux 6.x block layer and io_uring tree(s)