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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2015-2017 Intel Deutschland GmbH
9 * Copyright (C) 2018-2024 Intel Corporation
10 *
11 * element parsing for mac80211
12 */
13
14#include <net/mac80211.h>
15#include <linux/netdevice.h>
16#include <linux/export.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/skbuff.h>
20#include <linux/etherdevice.h>
21#include <linux/if_arp.h>
22#include <linux/bitmap.h>
23#include <linux/crc32.h>
24#include <net/net_namespace.h>
25#include <net/cfg80211.h>
26#include <net/rtnetlink.h>
27#include <kunit/visibility.h>
28
29#include "ieee80211_i.h"
30#include "driver-ops.h"
31#include "rate.h"
32#include "mesh.h"
33#include "wme.h"
34#include "led.h"
35#include "wep.h"
36
37struct ieee80211_elems_parse {
38 /* must be first for kfree to work */
39 struct ieee802_11_elems elems;
40
41 /* The basic Multi-Link element in the original elements */
42 const struct element *ml_basic_elem;
43
44 /* The reconfiguration Multi-Link element in the original elements */
45 const struct element *ml_reconf_elem;
46
47 /*
48 * scratch buffer that can be used for various element parsing related
49 * tasks, e.g., element de-fragmentation etc.
50 */
51 size_t scratch_len;
52 u8 *scratch_pos;
53 u8 scratch[] __counted_by(scratch_len);
54};
55
56static void
57ieee80211_parse_extension_element(u32 *crc,
58 const struct element *elem,
59 struct ieee80211_elems_parse *elems_parse,
60 struct ieee80211_elems_parse_params *params)
61{
62 struct ieee802_11_elems *elems = &elems_parse->elems;
63 const void *data = elem->data + 1;
64 bool calc_crc = false;
65 u8 len;
66
67 if (!elem->datalen)
68 return;
69
70 len = elem->datalen - 1;
71
72 switch (elem->data[0]) {
73 case WLAN_EID_EXT_HE_MU_EDCA:
74 if (params->mode < IEEE80211_CONN_MODE_HE)
75 break;
76 calc_crc = true;
77 if (len >= sizeof(*elems->mu_edca_param_set))
78 elems->mu_edca_param_set = data;
79 break;
80 case WLAN_EID_EXT_HE_CAPABILITY:
81 if (params->mode < IEEE80211_CONN_MODE_HE)
82 break;
83 if (ieee80211_he_capa_size_ok(data, len)) {
84 elems->he_cap = data;
85 elems->he_cap_len = len;
86 }
87 break;
88 case WLAN_EID_EXT_HE_OPERATION:
89 if (params->mode < IEEE80211_CONN_MODE_HE)
90 break;
91 calc_crc = true;
92 if (len >= sizeof(*elems->he_operation) &&
93 len >= ieee80211_he_oper_size(data) - 1)
94 elems->he_operation = data;
95 break;
96 case WLAN_EID_EXT_UORA:
97 if (params->mode < IEEE80211_CONN_MODE_HE)
98 break;
99 if (len >= 1)
100 elems->uora_element = data;
101 break;
102 case WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME:
103 if (len == 3)
104 elems->max_channel_switch_time = data;
105 break;
106 case WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION:
107 if (len >= sizeof(*elems->mbssid_config_ie))
108 elems->mbssid_config_ie = data;
109 break;
110 case WLAN_EID_EXT_HE_SPR:
111 if (params->mode < IEEE80211_CONN_MODE_HE)
112 break;
113 if (len >= sizeof(*elems->he_spr) &&
114 len >= ieee80211_he_spr_size(data))
115 elems->he_spr = data;
116 break;
117 case WLAN_EID_EXT_HE_6GHZ_CAPA:
118 if (params->mode < IEEE80211_CONN_MODE_HE)
119 break;
120 if (len >= sizeof(*elems->he_6ghz_capa))
121 elems->he_6ghz_capa = data;
122 break;
123 case WLAN_EID_EXT_EHT_CAPABILITY:
124 if (params->mode < IEEE80211_CONN_MODE_EHT)
125 break;
126 if (ieee80211_eht_capa_size_ok(elems->he_cap,
127 data, len,
128 params->from_ap)) {
129 elems->eht_cap = data;
130 elems->eht_cap_len = len;
131 }
132 break;
133 case WLAN_EID_EXT_EHT_OPERATION:
134 if (params->mode < IEEE80211_CONN_MODE_EHT)
135 break;
136 if (ieee80211_eht_oper_size_ok(data, len))
137 elems->eht_operation = data;
138 calc_crc = true;
139 break;
140 case WLAN_EID_EXT_EHT_MULTI_LINK:
141 if (params->mode < IEEE80211_CONN_MODE_EHT)
142 break;
143 calc_crc = true;
144
145 if (ieee80211_mle_size_ok(data, len)) {
146 const struct ieee80211_multi_link_elem *mle =
147 (void *)data;
148
149 switch (le16_get_bits(mle->control,
150 IEEE80211_ML_CONTROL_TYPE)) {
151 case IEEE80211_ML_CONTROL_TYPE_BASIC:
152 if (elems_parse->ml_basic_elem) {
153 elems->parse_error |=
154 IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC;
155 break;
156 }
157 elems_parse->ml_basic_elem = elem;
158 break;
159 case IEEE80211_ML_CONTROL_TYPE_RECONF:
160 elems_parse->ml_reconf_elem = elem;
161 break;
162 default:
163 break;
164 }
165 }
166 break;
167 case WLAN_EID_EXT_BANDWIDTH_INDICATION:
168 if (params->mode < IEEE80211_CONN_MODE_EHT)
169 break;
170 if (ieee80211_bandwidth_indication_size_ok(data, len))
171 elems->bandwidth_indication = data;
172 calc_crc = true;
173 break;
174 case WLAN_EID_EXT_TID_TO_LINK_MAPPING:
175 if (params->mode < IEEE80211_CONN_MODE_EHT)
176 break;
177 calc_crc = true;
178 if (ieee80211_tid_to_link_map_size_ok(data, len) &&
179 elems->ttlm_num < ARRAY_SIZE(elems->ttlm)) {
180 elems->ttlm[elems->ttlm_num] = (void *)data;
181 elems->ttlm_num++;
182 }
183 break;
184 }
185
186 if (crc && calc_crc)
187 *crc = crc32_be(*crc, (void *)elem, elem->datalen + 2);
188}
189
190static u32
191_ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
192 struct ieee80211_elems_parse *elems_parse,
193 const struct element *check_inherit)
194{
195 struct ieee802_11_elems *elems = &elems_parse->elems;
196 const struct element *elem;
197 bool calc_crc = params->filter != 0;
198 DECLARE_BITMAP(seen_elems, 256);
199 u32 crc = params->crc;
200
201 bitmap_zero(seen_elems, 256);
202
203 for_each_element(elem, params->start, params->len) {
204 const struct element *subelem;
205 u8 elem_parse_failed;
206 u8 id = elem->id;
207 u8 elen = elem->datalen;
208 const u8 *pos = elem->data;
209
210 if (check_inherit &&
211 !cfg80211_is_element_inherited(elem,
212 check_inherit))
213 continue;
214
215 switch (id) {
216 case WLAN_EID_SSID:
217 case WLAN_EID_SUPP_RATES:
218 case WLAN_EID_FH_PARAMS:
219 case WLAN_EID_DS_PARAMS:
220 case WLAN_EID_CF_PARAMS:
221 case WLAN_EID_TIM:
222 case WLAN_EID_IBSS_PARAMS:
223 case WLAN_EID_CHALLENGE:
224 case WLAN_EID_RSN:
225 case WLAN_EID_ERP_INFO:
226 case WLAN_EID_EXT_SUPP_RATES:
227 case WLAN_EID_HT_CAPABILITY:
228 case WLAN_EID_HT_OPERATION:
229 case WLAN_EID_VHT_CAPABILITY:
230 case WLAN_EID_VHT_OPERATION:
231 case WLAN_EID_MESH_ID:
232 case WLAN_EID_MESH_CONFIG:
233 case WLAN_EID_PEER_MGMT:
234 case WLAN_EID_PREQ:
235 case WLAN_EID_PREP:
236 case WLAN_EID_PERR:
237 case WLAN_EID_RANN:
238 case WLAN_EID_CHANNEL_SWITCH:
239 case WLAN_EID_EXT_CHANSWITCH_ANN:
240 case WLAN_EID_COUNTRY:
241 case WLAN_EID_PWR_CONSTRAINT:
242 case WLAN_EID_TIMEOUT_INTERVAL:
243 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
244 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
245 case WLAN_EID_CHAN_SWITCH_PARAM:
246 case WLAN_EID_EXT_CAPABILITY:
247 case WLAN_EID_CHAN_SWITCH_TIMING:
248 case WLAN_EID_LINK_ID:
249 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
250 case WLAN_EID_RSNX:
251 case WLAN_EID_S1G_BCN_COMPAT:
252 case WLAN_EID_S1G_CAPABILITIES:
253 case WLAN_EID_S1G_OPERATION:
254 case WLAN_EID_AID_RESPONSE:
255 case WLAN_EID_S1G_SHORT_BCN_INTERVAL:
256 /*
257 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
258 * that if the content gets bigger it might be needed more than once
259 */
260 if (test_bit(id, seen_elems)) {
261 elems->parse_error |=
262 IEEE80211_PARSE_ERR_DUP_ELEM;
263 continue;
264 }
265 break;
266 }
267
268 if (calc_crc && id < 64 && (params->filter & (1ULL << id)))
269 crc = crc32_be(crc, pos - 2, elen + 2);
270
271 elem_parse_failed = 0;
272
273 switch (id) {
274 case WLAN_EID_LINK_ID:
275 if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) {
276 elem_parse_failed =
277 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
278 break;
279 }
280 elems->lnk_id = (void *)(pos - 2);
281 break;
282 case WLAN_EID_CHAN_SWITCH_TIMING:
283 if (elen < sizeof(struct ieee80211_ch_switch_timing)) {
284 elem_parse_failed =
285 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
286 break;
287 }
288 elems->ch_sw_timing = (void *)pos;
289 break;
290 case WLAN_EID_EXT_CAPABILITY:
291 elems->ext_capab = pos;
292 elems->ext_capab_len = elen;
293 break;
294 case WLAN_EID_SSID:
295 elems->ssid = pos;
296 elems->ssid_len = elen;
297 break;
298 case WLAN_EID_SUPP_RATES:
299 elems->supp_rates = pos;
300 elems->supp_rates_len = elen;
301 break;
302 case WLAN_EID_DS_PARAMS:
303 if (elen >= 1)
304 elems->ds_params = pos;
305 else
306 elem_parse_failed =
307 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
308 break;
309 case WLAN_EID_TIM:
310 if (elen >= sizeof(struct ieee80211_tim_ie)) {
311 elems->tim = (void *)pos;
312 elems->tim_len = elen;
313 } else
314 elem_parse_failed =
315 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
316 break;
317 case WLAN_EID_VENDOR_SPECIFIC:
318 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
319 pos[2] == 0xf2) {
320 /* Microsoft OUI (00:50:F2) */
321
322 if (calc_crc)
323 crc = crc32_be(crc, pos - 2, elen + 2);
324
325 if (elen >= 5 && pos[3] == 2) {
326 /* OUI Type 2 - WMM IE */
327 if (pos[4] == 0) {
328 elems->wmm_info = pos;
329 elems->wmm_info_len = elen;
330 } else if (pos[4] == 1) {
331 elems->wmm_param = pos;
332 elems->wmm_param_len = elen;
333 }
334 }
335 }
336 break;
337 case WLAN_EID_RSN:
338 elems->rsn = pos;
339 elems->rsn_len = elen;
340 break;
341 case WLAN_EID_ERP_INFO:
342 if (elen >= 1)
343 elems->erp_info = pos;
344 else
345 elem_parse_failed =
346 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
347 break;
348 case WLAN_EID_EXT_SUPP_RATES:
349 elems->ext_supp_rates = pos;
350 elems->ext_supp_rates_len = elen;
351 break;
352 case WLAN_EID_HT_CAPABILITY:
353 if (params->mode < IEEE80211_CONN_MODE_HT)
354 break;
355 if (elen >= sizeof(struct ieee80211_ht_cap))
356 elems->ht_cap_elem = (void *)pos;
357 else
358 elem_parse_failed =
359 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
360 break;
361 case WLAN_EID_HT_OPERATION:
362 if (params->mode < IEEE80211_CONN_MODE_HT)
363 break;
364 if (elen >= sizeof(struct ieee80211_ht_operation))
365 elems->ht_operation = (void *)pos;
366 else
367 elem_parse_failed =
368 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
369 break;
370 case WLAN_EID_VHT_CAPABILITY:
371 if (params->mode < IEEE80211_CONN_MODE_VHT)
372 break;
373 if (elen >= sizeof(struct ieee80211_vht_cap))
374 elems->vht_cap_elem = (void *)pos;
375 else
376 elem_parse_failed =
377 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
378 break;
379 case WLAN_EID_VHT_OPERATION:
380 if (params->mode < IEEE80211_CONN_MODE_VHT)
381 break;
382 if (elen >= sizeof(struct ieee80211_vht_operation)) {
383 elems->vht_operation = (void *)pos;
384 if (calc_crc)
385 crc = crc32_be(crc, pos - 2, elen + 2);
386 break;
387 }
388 elem_parse_failed =
389 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
390 break;
391 case WLAN_EID_OPMODE_NOTIF:
392 if (params->mode < IEEE80211_CONN_MODE_VHT)
393 break;
394 if (elen > 0) {
395 elems->opmode_notif = pos;
396 if (calc_crc)
397 crc = crc32_be(crc, pos - 2, elen + 2);
398 break;
399 }
400 elem_parse_failed =
401 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
402 break;
403 case WLAN_EID_MESH_ID:
404 elems->mesh_id = pos;
405 elems->mesh_id_len = elen;
406 break;
407 case WLAN_EID_MESH_CONFIG:
408 if (elen >= sizeof(struct ieee80211_meshconf_ie))
409 elems->mesh_config = (void *)pos;
410 else
411 elem_parse_failed =
412 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
413 break;
414 case WLAN_EID_PEER_MGMT:
415 elems->peering = pos;
416 elems->peering_len = elen;
417 break;
418 case WLAN_EID_MESH_AWAKE_WINDOW:
419 if (elen >= 2)
420 elems->awake_window = (void *)pos;
421 break;
422 case WLAN_EID_PREQ:
423 elems->preq = pos;
424 elems->preq_len = elen;
425 break;
426 case WLAN_EID_PREP:
427 elems->prep = pos;
428 elems->prep_len = elen;
429 break;
430 case WLAN_EID_PERR:
431 elems->perr = pos;
432 elems->perr_len = elen;
433 break;
434 case WLAN_EID_RANN:
435 if (elen >= sizeof(struct ieee80211_rann_ie))
436 elems->rann = (void *)pos;
437 else
438 elem_parse_failed =
439 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
440 break;
441 case WLAN_EID_CHANNEL_SWITCH:
442 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
443 elem_parse_failed =
444 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
445 break;
446 }
447 elems->ch_switch_ie = (void *)pos;
448 break;
449 case WLAN_EID_EXT_CHANSWITCH_ANN:
450 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
451 elem_parse_failed =
452 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
453 break;
454 }
455 elems->ext_chansw_ie = (void *)pos;
456 break;
457 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
458 if (params->mode < IEEE80211_CONN_MODE_HT)
459 break;
460 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
461 elem_parse_failed =
462 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
463 break;
464 }
465 elems->sec_chan_offs = (void *)pos;
466 break;
467 case WLAN_EID_CHAN_SWITCH_PARAM:
468 if (elen <
469 sizeof(*elems->mesh_chansw_params_ie)) {
470 elem_parse_failed =
471 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
472 break;
473 }
474 elems->mesh_chansw_params_ie = (void *)pos;
475 break;
476 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
477 if (params->mode < IEEE80211_CONN_MODE_VHT)
478 break;
479
480 if (!params->action) {
481 elem_parse_failed =
482 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
483 break;
484 }
485
486 if (elen < sizeof(*elems->wide_bw_chansw_ie)) {
487 elem_parse_failed =
488 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
489 break;
490 }
491 elems->wide_bw_chansw_ie = (void *)pos;
492 break;
493 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
494 if (params->mode < IEEE80211_CONN_MODE_VHT)
495 break;
496 if (params->action) {
497 elem_parse_failed =
498 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
499 break;
500 }
501 /*
502 * This is a bit tricky, but as we only care about
503 * a few elements, parse them out manually.
504 */
505 subelem = cfg80211_find_elem(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
506 pos, elen);
507 if (subelem) {
508 if (subelem->datalen >= sizeof(*elems->wide_bw_chansw_ie))
509 elems->wide_bw_chansw_ie =
510 (void *)subelem->data;
511 else
512 elem_parse_failed =
513 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
514 }
515
516 if (params->mode < IEEE80211_CONN_MODE_EHT)
517 break;
518
519 subelem = cfg80211_find_ext_elem(WLAN_EID_EXT_BANDWIDTH_INDICATION,
520 pos, elen);
521 if (subelem) {
522 const void *edata = subelem->data + 1;
523 u8 edatalen = subelem->datalen - 1;
524
525 if (ieee80211_bandwidth_indication_size_ok(edata,
526 edatalen))
527 elems->bandwidth_indication = edata;
528 else
529 elem_parse_failed =
530 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
531 }
532 break;
533 case WLAN_EID_COUNTRY:
534 elems->country_elem = pos;
535 elems->country_elem_len = elen;
536 break;
537 case WLAN_EID_PWR_CONSTRAINT:
538 if (elen != 1) {
539 elem_parse_failed =
540 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
541 break;
542 }
543 elems->pwr_constr_elem = pos;
544 break;
545 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
546 /* Lots of different options exist, but we only care
547 * about the Dynamic Transmit Power Control element.
548 * First check for the Cisco OUI, then for the DTPC
549 * tag (0x00).
550 */
551 if (elen < 4) {
552 elem_parse_failed =
553 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
554 break;
555 }
556
557 if (pos[0] != 0x00 || pos[1] != 0x40 ||
558 pos[2] != 0x96 || pos[3] != 0x00)
559 break;
560
561 if (elen != 6) {
562 elem_parse_failed =
563 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
564 break;
565 }
566
567 if (calc_crc)
568 crc = crc32_be(crc, pos - 2, elen + 2);
569
570 elems->cisco_dtpc_elem = pos;
571 break;
572 case WLAN_EID_ADDBA_EXT:
573 if (elen < sizeof(struct ieee80211_addba_ext_ie)) {
574 elem_parse_failed =
575 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
576 break;
577 }
578 elems->addba_ext_ie = (void *)pos;
579 break;
580 case WLAN_EID_TIMEOUT_INTERVAL:
581 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
582 elems->timeout_int = (void *)pos;
583 else
584 elem_parse_failed =
585 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
586 break;
587 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
588 if (elen >= sizeof(*elems->max_idle_period_ie))
589 elems->max_idle_period_ie = (void *)pos;
590 break;
591 case WLAN_EID_RSNX:
592 elems->rsnx = pos;
593 elems->rsnx_len = elen;
594 break;
595 case WLAN_EID_TX_POWER_ENVELOPE:
596 if (elen < 1 ||
597 elen > sizeof(struct ieee80211_tx_pwr_env))
598 break;
599
600 if (elems->tx_pwr_env_num >= ARRAY_SIZE(elems->tx_pwr_env))
601 break;
602
603 elems->tx_pwr_env[elems->tx_pwr_env_num] = (void *)pos;
604 elems->tx_pwr_env_len[elems->tx_pwr_env_num] = elen;
605 elems->tx_pwr_env_num++;
606 break;
607 case WLAN_EID_EXTENSION:
608 ieee80211_parse_extension_element(calc_crc ?
609 &crc : NULL,
610 elem, elems_parse,
611 params);
612 break;
613 case WLAN_EID_S1G_CAPABILITIES:
614 if (params->mode != IEEE80211_CONN_MODE_S1G)
615 break;
616 if (elen >= sizeof(*elems->s1g_capab))
617 elems->s1g_capab = (void *)pos;
618 else
619 elem_parse_failed =
620 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
621 break;
622 case WLAN_EID_S1G_OPERATION:
623 if (params->mode != IEEE80211_CONN_MODE_S1G)
624 break;
625 if (elen == sizeof(*elems->s1g_oper))
626 elems->s1g_oper = (void *)pos;
627 else
628 elem_parse_failed =
629 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
630 break;
631 case WLAN_EID_S1G_BCN_COMPAT:
632 if (params->mode != IEEE80211_CONN_MODE_S1G)
633 break;
634 if (elen == sizeof(*elems->s1g_bcn_compat))
635 elems->s1g_bcn_compat = (void *)pos;
636 else
637 elem_parse_failed =
638 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
639 break;
640 case WLAN_EID_AID_RESPONSE:
641 if (params->mode != IEEE80211_CONN_MODE_S1G)
642 break;
643 if (elen == sizeof(struct ieee80211_aid_response_ie))
644 elems->aid_resp = (void *)pos;
645 else
646 elem_parse_failed =
647 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
648 break;
649 default:
650 break;
651 }
652
653 if (elem_parse_failed)
654 elems->parse_error |= elem_parse_failed;
655 else
656 __set_bit(id, seen_elems);
657 }
658
659 if (!for_each_element_completed(elem, params->start, params->len))
660 elems->parse_error |= IEEE80211_PARSE_ERR_INVALID_END;
661
662 return crc;
663}
664
665static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
666 struct ieee802_11_elems *elems,
667 struct cfg80211_bss *bss,
668 u8 *nontransmitted_profile)
669{
670 const struct element *elem, *sub;
671 size_t profile_len = 0;
672 bool found = false;
673
674 if (!bss || !bss->transmitted_bss)
675 return profile_len;
676
677 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
678 if (elem->datalen < 2)
679 continue;
680 if (elem->data[0] < 1 || elem->data[0] > 8)
681 continue;
682
683 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
684 u8 new_bssid[ETH_ALEN];
685 const u8 *index;
686
687 if (sub->id != 0 || sub->datalen < 4) {
688 /* not a valid BSS profile */
689 continue;
690 }
691
692 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
693 sub->data[1] != 2) {
694 /* The first element of the
695 * Nontransmitted BSSID Profile is not
696 * the Nontransmitted BSSID Capability
697 * element.
698 */
699 continue;
700 }
701
702 memset(nontransmitted_profile, 0, len);
703 profile_len = cfg80211_merge_profile(start, len,
704 elem,
705 sub,
706 nontransmitted_profile,
707 len);
708
709 /* found a Nontransmitted BSSID Profile */
710 index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX,
711 nontransmitted_profile,
712 profile_len);
713 if (!index || index[1] < 1 || index[2] == 0) {
714 /* Invalid MBSSID Index element */
715 continue;
716 }
717
718 cfg80211_gen_new_bssid(bss->transmitted_bss->bssid,
719 elem->data[0],
720 index[2],
721 new_bssid);
722 if (ether_addr_equal(new_bssid, bss->bssid)) {
723 found = true;
724 elems->bssid_index_len = index[1];
725 elems->bssid_index = (void *)&index[2];
726 break;
727 }
728 }
729 }
730
731 return found ? profile_len : 0;
732}
733
734static void
735ieee80211_mle_get_sta_prof(struct ieee80211_elems_parse *elems_parse,
736 u8 link_id)
737{
738 struct ieee802_11_elems *elems = &elems_parse->elems;
739 const struct ieee80211_multi_link_elem *ml = elems->ml_basic;
740 ssize_t ml_len = elems->ml_basic_len;
741 const struct element *sub;
742
743 for_each_mle_subelement(sub, (u8 *)ml, ml_len) {
744 struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data;
745 ssize_t sta_prof_len;
746 u16 control;
747
748 if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE)
749 continue;
750
751 if (!ieee80211_mle_basic_sta_prof_size_ok(sub->data,
752 sub->datalen))
753 return;
754
755 control = le16_to_cpu(prof->control);
756
757 if (link_id != u16_get_bits(control,
758 IEEE80211_MLE_STA_CONTROL_LINK_ID))
759 continue;
760
761 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
762 return;
763
764 /* the sub element can be fragmented */
765 sta_prof_len =
766 cfg80211_defragment_element(sub,
767 (u8 *)ml, ml_len,
768 elems_parse->scratch_pos,
769 elems_parse->scratch +
770 elems_parse->scratch_len -
771 elems_parse->scratch_pos,
772 IEEE80211_MLE_SUBELEM_FRAGMENT);
773
774 if (sta_prof_len < 0)
775 return;
776
777 elems->prof = (void *)elems_parse->scratch_pos;
778 elems->sta_prof_len = sta_prof_len;
779 elems_parse->scratch_pos += sta_prof_len;
780
781 return;
782 }
783}
784
785static void ieee80211_mle_parse_link(struct ieee80211_elems_parse *elems_parse,
786 struct ieee80211_elems_parse_params *params)
787{
788 struct ieee802_11_elems *elems = &elems_parse->elems;
789 struct ieee80211_mle_per_sta_profile *prof;
790 struct ieee80211_elems_parse_params sub = {
791 .mode = params->mode,
792 .action = params->action,
793 .from_ap = params->from_ap,
794 .link_id = -1,
795 };
796 ssize_t ml_len = elems->ml_basic_len;
797 const struct element *non_inherit = NULL;
798 const u8 *end;
799
800 ml_len = cfg80211_defragment_element(elems_parse->ml_basic_elem,
801 elems->ie_start,
802 elems->total_len,
803 elems_parse->scratch_pos,
804 elems_parse->scratch +
805 elems_parse->scratch_len -
806 elems_parse->scratch_pos,
807 WLAN_EID_FRAGMENT);
808
809 if (ml_len < 0)
810 return;
811
812 elems->ml_basic = (const void *)elems_parse->scratch_pos;
813 elems->ml_basic_len = ml_len;
814 elems_parse->scratch_pos += ml_len;
815
816 if (params->link_id == -1)
817 return;
818
819 ieee80211_mle_get_sta_prof(elems_parse, params->link_id);
820 prof = elems->prof;
821
822 if (!prof)
823 return;
824
825 /* check if we have the 4 bytes for the fixed part in assoc response */
826 if (elems->sta_prof_len < sizeof(*prof) + prof->sta_info_len - 1 + 4) {
827 elems->prof = NULL;
828 elems->sta_prof_len = 0;
829 return;
830 }
831
832 /*
833 * Skip the capability information and the status code that are expected
834 * as part of the station profile in association response frames. Note
835 * the -1 is because the 'sta_info_len' is accounted to as part of the
836 * per-STA profile, but not part of the 'u8 variable[]' portion.
837 */
838 sub.start = prof->variable + prof->sta_info_len - 1 + 4;
839 end = (const u8 *)prof + elems->sta_prof_len;
840 sub.len = end - sub.start;
841
842 non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
843 sub.start, sub.len);
844 _ieee802_11_parse_elems_full(&sub, elems_parse, non_inherit);
845}
846
847static void
848ieee80211_mle_defrag_reconf(struct ieee80211_elems_parse *elems_parse)
849{
850 struct ieee802_11_elems *elems = &elems_parse->elems;
851 ssize_t ml_len;
852
853 ml_len = cfg80211_defragment_element(elems_parse->ml_reconf_elem,
854 elems->ie_start,
855 elems->total_len,
856 elems_parse->scratch_pos,
857 elems_parse->scratch +
858 elems_parse->scratch_len -
859 elems_parse->scratch_pos,
860 WLAN_EID_FRAGMENT);
861 if (ml_len < 0)
862 return;
863 elems->ml_reconf = (void *)elems_parse->scratch_pos;
864 elems->ml_reconf_len = ml_len;
865 elems_parse->scratch_pos += ml_len;
866}
867
868struct ieee802_11_elems *
869ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
870{
871 struct ieee80211_elems_parse *elems_parse;
872 struct ieee802_11_elems *elems;
873 const struct element *non_inherit = NULL;
874 u8 *nontransmitted_profile;
875 int nontransmitted_profile_len = 0;
876 size_t scratch_len = 3 * params->len;
877
878 BUILD_BUG_ON(offsetof(typeof(*elems_parse), elems) != 0);
879
880 elems_parse = kzalloc(struct_size(elems_parse, scratch, scratch_len),
881 GFP_ATOMIC);
882 if (!elems_parse)
883 return NULL;
884
885 elems_parse->scratch_len = scratch_len;
886 elems_parse->scratch_pos = elems_parse->scratch;
887
888 elems = &elems_parse->elems;
889 elems->ie_start = params->start;
890 elems->total_len = params->len;
891
892 nontransmitted_profile = elems_parse->scratch_pos;
893 nontransmitted_profile_len =
894 ieee802_11_find_bssid_profile(params->start, params->len,
895 elems, params->bss,
896 nontransmitted_profile);
897 elems_parse->scratch_pos += nontransmitted_profile_len;
898 non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
899 nontransmitted_profile,
900 nontransmitted_profile_len);
901
902 elems->crc = _ieee802_11_parse_elems_full(params, elems_parse,
903 non_inherit);
904
905 /* Override with nontransmitted profile, if found */
906 if (nontransmitted_profile_len) {
907 struct ieee80211_elems_parse_params sub = {
908 .mode = params->mode,
909 .start = nontransmitted_profile,
910 .len = nontransmitted_profile_len,
911 .action = params->action,
912 .link_id = params->link_id,
913 };
914
915 _ieee802_11_parse_elems_full(&sub, elems_parse, NULL);
916 }
917
918 ieee80211_mle_parse_link(elems_parse, params);
919
920 ieee80211_mle_defrag_reconf(elems_parse);
921
922 if (elems->tim && !elems->parse_error) {
923 const struct ieee80211_tim_ie *tim_ie = elems->tim;
924
925 elems->dtim_period = tim_ie->dtim_period;
926 elems->dtim_count = tim_ie->dtim_count;
927 }
928
929 /* Override DTIM period and count if needed */
930 if (elems->bssid_index &&
931 elems->bssid_index_len >=
932 offsetofend(struct ieee80211_bssid_index, dtim_period))
933 elems->dtim_period = elems->bssid_index->dtim_period;
934
935 if (elems->bssid_index &&
936 elems->bssid_index_len >=
937 offsetofend(struct ieee80211_bssid_index, dtim_count))
938 elems->dtim_count = elems->bssid_index->dtim_count;
939
940 return elems;
941}
942EXPORT_SYMBOL_IF_KUNIT(ieee802_11_parse_elems_full);
943
944int ieee80211_parse_bitrates(enum nl80211_chan_width width,
945 const struct ieee80211_supported_band *sband,
946 const u8 *srates, int srates_len, u32 *rates)
947{
948 u32 rate_flags = ieee80211_chanwidth_rate_flags(width);
949 struct ieee80211_rate *br;
950 int brate, rate, i, j, count = 0;
951
952 *rates = 0;
953
954 for (i = 0; i < srates_len; i++) {
955 rate = srates[i] & 0x7f;
956
957 for (j = 0; j < sband->n_bitrates; j++) {
958 br = &sband->bitrates[j];
959 if ((rate_flags & br->flags) != rate_flags)
960 continue;
961
962 brate = DIV_ROUND_UP(br->bitrate, 5);
963 if (brate == rate) {
964 *rates |= BIT(j);
965 count++;
966 break;
967 }
968 }
969 }
970 return count;
971}