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 /* The EPCS Multi-Link element in the original elements */
48 const struct element *ml_epcs_elem;
49
50 bool multi_link_inner;
51 bool skip_vendor;
52
53 /*
54 * scratch buffer that can be used for various element parsing related
55 * tasks, e.g., element de-fragmentation etc.
56 */
57 size_t scratch_len;
58 u8 *scratch_pos;
59 u8 scratch[] __counted_by(scratch_len);
60};
61
62static void
63ieee80211_parse_extension_element(u32 *crc,
64 const struct element *elem,
65 struct ieee80211_elems_parse *elems_parse,
66 struct ieee80211_elems_parse_params *params)
67{
68 struct ieee802_11_elems *elems = &elems_parse->elems;
69 const void *data = elem->data + 1;
70 bool calc_crc = false;
71 u8 len;
72
73 if (!elem->datalen)
74 return;
75
76 len = elem->datalen - 1;
77
78 switch (elem->data[0]) {
79 case WLAN_EID_EXT_HE_MU_EDCA:
80 if (params->mode < IEEE80211_CONN_MODE_HE)
81 break;
82 calc_crc = true;
83 if (len >= sizeof(*elems->mu_edca_param_set))
84 elems->mu_edca_param_set = data;
85 break;
86 case WLAN_EID_EXT_HE_CAPABILITY:
87 if (params->mode < IEEE80211_CONN_MODE_HE)
88 break;
89 if (ieee80211_he_capa_size_ok(data, len)) {
90 elems->he_cap = data;
91 elems->he_cap_len = len;
92 }
93 break;
94 case WLAN_EID_EXT_HE_OPERATION:
95 if (params->mode < IEEE80211_CONN_MODE_HE)
96 break;
97 calc_crc = true;
98 if (len >= sizeof(*elems->he_operation) &&
99 len >= ieee80211_he_oper_size(he_oper_ie: data) - 1)
100 elems->he_operation = data;
101 break;
102 case WLAN_EID_EXT_UORA:
103 if (params->mode < IEEE80211_CONN_MODE_HE)
104 break;
105 if (len >= 1)
106 elems->uora_element = data;
107 break;
108 case WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME:
109 if (len == 3)
110 elems->max_channel_switch_time = data;
111 break;
112 case WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION:
113 if (len >= sizeof(*elems->mbssid_config_ie))
114 elems->mbssid_config_ie = data;
115 break;
116 case WLAN_EID_EXT_HE_SPR:
117 if (params->mode < IEEE80211_CONN_MODE_HE)
118 break;
119 if (len >= sizeof(*elems->he_spr) &&
120 len >= ieee80211_he_spr_size(he_spr_ie: data) - 1)
121 elems->he_spr = data;
122 break;
123 case WLAN_EID_EXT_HE_6GHZ_CAPA:
124 if (params->mode < IEEE80211_CONN_MODE_HE)
125 break;
126 if (len >= sizeof(*elems->he_6ghz_capa))
127 elems->he_6ghz_capa = data;
128 break;
129 case WLAN_EID_EXT_EHT_CAPABILITY:
130 if (params->mode < IEEE80211_CONN_MODE_EHT)
131 break;
132 if (ieee80211_eht_capa_size_ok(he_capa: elems->he_cap,
133 data, len,
134 from_ap: params->from_ap)) {
135 elems->eht_cap = data;
136 elems->eht_cap_len = len;
137 }
138 break;
139 case WLAN_EID_EXT_EHT_OPERATION:
140 if (params->mode < IEEE80211_CONN_MODE_EHT)
141 break;
142 if (ieee80211_eht_oper_size_ok(data, len))
143 elems->eht_operation = data;
144 calc_crc = true;
145 break;
146 case WLAN_EID_EXT_EHT_MULTI_LINK:
147 if (params->mode < IEEE80211_CONN_MODE_EHT)
148 break;
149 calc_crc = true;
150
151 if (ieee80211_mle_size_ok(data, len)) {
152 const struct ieee80211_multi_link_elem *mle =
153 (void *)data;
154
155 switch (le16_get_bits(v: mle->control,
156 IEEE80211_ML_CONTROL_TYPE)) {
157 case IEEE80211_ML_CONTROL_TYPE_BASIC:
158 if (elems_parse->multi_link_inner) {
159 elems->parse_error |=
160 IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC;
161 break;
162 }
163 break;
164 case IEEE80211_ML_CONTROL_TYPE_RECONF:
165 elems_parse->ml_reconf_elem = elem;
166 break;
167 case IEEE80211_ML_CONTROL_TYPE_PRIO_ACCESS:
168 elems_parse->ml_epcs_elem = elem;
169 break;
170 default:
171 break;
172 }
173 }
174 break;
175 case WLAN_EID_EXT_BANDWIDTH_INDICATION:
176 if (params->mode < IEEE80211_CONN_MODE_EHT)
177 break;
178 if (ieee80211_bandwidth_indication_size_ok(data, len))
179 elems->bandwidth_indication = data;
180 calc_crc = true;
181 break;
182 case WLAN_EID_EXT_TID_TO_LINK_MAPPING:
183 if (params->mode < IEEE80211_CONN_MODE_EHT)
184 break;
185 calc_crc = true;
186 if (ieee80211_tid_to_link_map_size_ok(data, len) &&
187 elems->ttlm_num < ARRAY_SIZE(elems->ttlm)) {
188 elems->ttlm[elems->ttlm_num] = (void *)data;
189 elems->ttlm_num++;
190 }
191 break;
192 }
193
194 if (crc && calc_crc)
195 *crc = crc32_be(crc: *crc, p: (void *)elem, len: elem->datalen + 2);
196}
197
198static void ieee80211_parse_tpe(struct ieee80211_parsed_tpe *tpe,
199 const u8 *data, u8 len)
200{
201 const struct ieee80211_tx_pwr_env *env = (const void *)data;
202 u8 count, interpret, category;
203 u8 *out, N, *cnt_out = NULL, *N_out = NULL;
204
205 if (!ieee80211_valid_tpe_element(data, len))
206 return;
207
208 count = u8_get_bits(v: env->info, IEEE80211_TX_PWR_ENV_INFO_COUNT);
209 interpret = u8_get_bits(v: env->info, IEEE80211_TX_PWR_ENV_INFO_INTERPRET);
210 category = u8_get_bits(v: env->info, IEEE80211_TX_PWR_ENV_INFO_CATEGORY);
211
212 switch (interpret) {
213 case IEEE80211_TPE_LOCAL_EIRP:
214 out = tpe->max_local[category].power;
215 cnt_out = &tpe->max_local[category].count;
216 tpe->max_local[category].valid = true;
217 break;
218 case IEEE80211_TPE_REG_CLIENT_EIRP:
219 out = tpe->max_reg_client[category].power;
220 cnt_out = &tpe->max_reg_client[category].count;
221 tpe->max_reg_client[category].valid = true;
222 break;
223 case IEEE80211_TPE_LOCAL_EIRP_PSD:
224 out = tpe->psd_local[category].power;
225 cnt_out = &tpe->psd_local[category].count;
226 N_out = &tpe->psd_local[category].n;
227 tpe->psd_local[category].valid = true;
228 break;
229 case IEEE80211_TPE_REG_CLIENT_EIRP_PSD:
230 out = tpe->psd_reg_client[category].power;
231 cnt_out = &tpe->psd_reg_client[category].count;
232 N_out = &tpe->psd_reg_client[category].n;
233 tpe->psd_reg_client[category].valid = true;
234 break;
235 }
236
237 switch (interpret) {
238 case IEEE80211_TPE_LOCAL_EIRP:
239 case IEEE80211_TPE_REG_CLIENT_EIRP:
240 /* count was validated <= 3, plus 320 MHz */
241 BUILD_BUG_ON(IEEE80211_TPE_EIRP_ENTRIES_320MHZ < 5);
242 memcpy(to: out, from: env->variable, len: count + 1);
243 *cnt_out = count + 1;
244 /* separately take 320 MHz if present */
245 if (count == 3 && len > sizeof(*env) + count + 1) {
246 out[4] = env->variable[4];
247 *cnt_out = 5;
248 }
249 break;
250 case IEEE80211_TPE_LOCAL_EIRP_PSD:
251 case IEEE80211_TPE_REG_CLIENT_EIRP_PSD:
252 if (!count) {
253 memset(s: out, c: env->variable[0],
254 IEEE80211_TPE_PSD_ENTRIES_320MHZ);
255 *cnt_out = IEEE80211_TPE_PSD_ENTRIES_320MHZ;
256 break;
257 }
258
259 N = 1 << (count - 1);
260 memcpy(to: out, from: env->variable, len: N);
261 *cnt_out = N;
262 *N_out = N;
263
264 if (len > sizeof(*env) + N) {
265 int K = u8_get_bits(v: env->variable[N],
266 IEEE80211_TX_PWR_ENV_EXT_COUNT);
267
268 K = min(K, IEEE80211_TPE_PSD_ENTRIES_320MHZ - N);
269 memcpy(to: out + N, from: env->variable + N + 1, len: K);
270 (*cnt_out) += K;
271 }
272 break;
273 }
274}
275
276static u32
277_ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
278 struct ieee80211_elems_parse *elems_parse,
279 const struct element *check_inherit)
280{
281 struct ieee802_11_elems *elems = &elems_parse->elems;
282 const struct element *elem;
283 bool calc_crc = params->filter != 0;
284 DECLARE_BITMAP(seen_elems, 256);
285 u32 crc = params->crc;
286
287 bitmap_zero(dst: seen_elems, nbits: 256);
288
289 for_each_element(elem, params->start, params->len) {
290 const struct element *subelem;
291 u8 elem_parse_failed;
292 u8 id = elem->id;
293 u8 elen = elem->datalen;
294 const u8 *pos = elem->data;
295
296 if (check_inherit &&
297 !cfg80211_is_element_inherited(element: elem,
298 non_inherit_element: check_inherit))
299 continue;
300
301 switch (id) {
302 case WLAN_EID_SSID:
303 case WLAN_EID_SUPP_RATES:
304 case WLAN_EID_FH_PARAMS:
305 case WLAN_EID_DS_PARAMS:
306 case WLAN_EID_CF_PARAMS:
307 case WLAN_EID_TIM:
308 case WLAN_EID_IBSS_PARAMS:
309 case WLAN_EID_CHALLENGE:
310 case WLAN_EID_RSN:
311 case WLAN_EID_ERP_INFO:
312 case WLAN_EID_EXT_SUPP_RATES:
313 case WLAN_EID_HT_CAPABILITY:
314 case WLAN_EID_HT_OPERATION:
315 case WLAN_EID_VHT_CAPABILITY:
316 case WLAN_EID_VHT_OPERATION:
317 case WLAN_EID_MESH_ID:
318 case WLAN_EID_MESH_CONFIG:
319 case WLAN_EID_PEER_MGMT:
320 case WLAN_EID_PREQ:
321 case WLAN_EID_PREP:
322 case WLAN_EID_PERR:
323 case WLAN_EID_RANN:
324 case WLAN_EID_CHANNEL_SWITCH:
325 case WLAN_EID_EXT_CHANSWITCH_ANN:
326 case WLAN_EID_COUNTRY:
327 case WLAN_EID_PWR_CONSTRAINT:
328 case WLAN_EID_TIMEOUT_INTERVAL:
329 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
330 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
331 case WLAN_EID_CHAN_SWITCH_PARAM:
332 case WLAN_EID_EXT_CAPABILITY:
333 case WLAN_EID_CHAN_SWITCH_TIMING:
334 case WLAN_EID_LINK_ID:
335 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
336 case WLAN_EID_RSNX:
337 case WLAN_EID_S1G_BCN_COMPAT:
338 case WLAN_EID_S1G_CAPABILITIES:
339 case WLAN_EID_S1G_OPERATION:
340 case WLAN_EID_AID_RESPONSE:
341 case WLAN_EID_S1G_SHORT_BCN_INTERVAL:
342 /*
343 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
344 * that if the content gets bigger it might be needed more than once
345 */
346 if (test_bit(id, seen_elems)) {
347 elems->parse_error |=
348 IEEE80211_PARSE_ERR_DUP_ELEM;
349 continue;
350 }
351 break;
352 }
353
354 if (calc_crc && id < 64 && (params->filter & (1ULL << id)))
355 crc = crc32_be(crc, p: pos - 2, len: elen + 2);
356
357 elem_parse_failed = 0;
358
359 switch (id) {
360 case WLAN_EID_LINK_ID:
361 if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) {
362 elem_parse_failed =
363 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
364 break;
365 }
366 elems->lnk_id = (void *)(pos - 2);
367 break;
368 case WLAN_EID_CHAN_SWITCH_TIMING:
369 if (elen < sizeof(struct ieee80211_ch_switch_timing)) {
370 elem_parse_failed =
371 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
372 break;
373 }
374 elems->ch_sw_timing = (void *)pos;
375 break;
376 case WLAN_EID_EXT_CAPABILITY:
377 elems->ext_capab = pos;
378 elems->ext_capab_len = elen;
379 break;
380 case WLAN_EID_SSID:
381 elems->ssid = pos;
382 elems->ssid_len = elen;
383 break;
384 case WLAN_EID_SUPP_RATES:
385 elems->supp_rates = pos;
386 elems->supp_rates_len = elen;
387 break;
388 case WLAN_EID_DS_PARAMS:
389 if (elen >= 1)
390 elems->ds_params = pos;
391 else
392 elem_parse_failed =
393 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
394 break;
395 case WLAN_EID_TIM:
396 if (elen >= sizeof(struct ieee80211_tim_ie)) {
397 elems->tim = (void *)pos;
398 elems->tim_len = elen;
399 } else
400 elem_parse_failed =
401 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
402 break;
403 case WLAN_EID_VENDOR_SPECIFIC:
404 if (elems_parse->skip_vendor)
405 break;
406
407 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
408 pos[2] == 0xf2) {
409 /* Microsoft OUI (00:50:F2) */
410
411 if (calc_crc)
412 crc = crc32_be(crc, p: pos - 2, len: elen + 2);
413
414 if (elen >= 5 && pos[3] == 2) {
415 /* OUI Type 2 - WMM IE */
416 if (pos[4] == 0) {
417 elems->wmm_info = pos;
418 elems->wmm_info_len = elen;
419 } else if (pos[4] == 1) {
420 elems->wmm_param = pos;
421 elems->wmm_param_len = elen;
422 }
423 }
424 }
425 break;
426 case WLAN_EID_RSN:
427 elems->rsn = pos;
428 elems->rsn_len = elen;
429 break;
430 case WLAN_EID_ERP_INFO:
431 if (elen >= 1)
432 elems->erp_info = pos;
433 else
434 elem_parse_failed =
435 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
436 break;
437 case WLAN_EID_EXT_SUPP_RATES:
438 elems->ext_supp_rates = pos;
439 elems->ext_supp_rates_len = elen;
440 break;
441 case WLAN_EID_HT_CAPABILITY:
442 if (params->mode < IEEE80211_CONN_MODE_HT)
443 break;
444 if (elen >= sizeof(struct ieee80211_ht_cap))
445 elems->ht_cap_elem = (void *)pos;
446 else
447 elem_parse_failed =
448 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
449 break;
450 case WLAN_EID_HT_OPERATION:
451 if (params->mode < IEEE80211_CONN_MODE_HT)
452 break;
453 if (elen >= sizeof(struct ieee80211_ht_operation))
454 elems->ht_operation = (void *)pos;
455 else
456 elem_parse_failed =
457 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
458 break;
459 case WLAN_EID_VHT_CAPABILITY:
460 if (params->mode < IEEE80211_CONN_MODE_VHT)
461 break;
462 if (elen >= sizeof(struct ieee80211_vht_cap))
463 elems->vht_cap_elem = (void *)pos;
464 else
465 elem_parse_failed =
466 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
467 break;
468 case WLAN_EID_VHT_OPERATION:
469 if (params->mode < IEEE80211_CONN_MODE_VHT)
470 break;
471 if (elen >= sizeof(struct ieee80211_vht_operation)) {
472 elems->vht_operation = (void *)pos;
473 if (calc_crc)
474 crc = crc32_be(crc, p: pos - 2, len: elen + 2);
475 break;
476 }
477 elem_parse_failed =
478 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
479 break;
480 case WLAN_EID_OPMODE_NOTIF:
481 if (params->mode < IEEE80211_CONN_MODE_VHT)
482 break;
483 if (elen > 0) {
484 elems->opmode_notif = pos;
485 if (calc_crc)
486 crc = crc32_be(crc, p: pos - 2, len: elen + 2);
487 break;
488 }
489 elem_parse_failed =
490 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
491 break;
492 case WLAN_EID_MESH_ID:
493 elems->mesh_id = pos;
494 elems->mesh_id_len = elen;
495 break;
496 case WLAN_EID_MESH_CONFIG:
497 if (elen >= sizeof(struct ieee80211_meshconf_ie))
498 elems->mesh_config = (void *)pos;
499 else
500 elem_parse_failed =
501 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
502 break;
503 case WLAN_EID_PEER_MGMT:
504 elems->peering = pos;
505 elems->peering_len = elen;
506 break;
507 case WLAN_EID_MESH_AWAKE_WINDOW:
508 if (elen >= 2)
509 elems->awake_window = (void *)pos;
510 break;
511 case WLAN_EID_PREQ:
512 elems->preq = pos;
513 elems->preq_len = elen;
514 break;
515 case WLAN_EID_PREP:
516 elems->prep = pos;
517 elems->prep_len = elen;
518 break;
519 case WLAN_EID_PERR:
520 elems->perr = pos;
521 elems->perr_len = elen;
522 break;
523 case WLAN_EID_RANN:
524 if (elen >= sizeof(struct ieee80211_rann_ie))
525 elems->rann = (void *)pos;
526 else
527 elem_parse_failed =
528 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
529 break;
530 case WLAN_EID_CHANNEL_SWITCH:
531 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
532 elem_parse_failed =
533 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
534 break;
535 }
536 elems->ch_switch_ie = (void *)pos;
537 break;
538 case WLAN_EID_EXT_CHANSWITCH_ANN:
539 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
540 elem_parse_failed =
541 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
542 break;
543 }
544 elems->ext_chansw_ie = (void *)pos;
545 break;
546 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
547 if (params->mode < IEEE80211_CONN_MODE_HT)
548 break;
549 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
550 elem_parse_failed =
551 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
552 break;
553 }
554 elems->sec_chan_offs = (void *)pos;
555 break;
556 case WLAN_EID_CHAN_SWITCH_PARAM:
557 if (elen <
558 sizeof(*elems->mesh_chansw_params_ie)) {
559 elem_parse_failed =
560 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
561 break;
562 }
563 elems->mesh_chansw_params_ie = (void *)pos;
564 break;
565 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
566 if (params->mode < IEEE80211_CONN_MODE_VHT)
567 break;
568
569 if (!params->action) {
570 elem_parse_failed =
571 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
572 break;
573 }
574
575 if (elen < sizeof(*elems->wide_bw_chansw_ie)) {
576 elem_parse_failed =
577 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
578 break;
579 }
580 elems->wide_bw_chansw_ie = (void *)pos;
581 break;
582 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
583 if (params->mode < IEEE80211_CONN_MODE_VHT)
584 break;
585 if (params->action) {
586 elem_parse_failed =
587 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
588 break;
589 }
590 /*
591 * This is a bit tricky, but as we only care about
592 * a few elements, parse them out manually.
593 */
594 subelem = cfg80211_find_elem(eid: WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
595 ies: pos, len: elen);
596 if (subelem) {
597 if (subelem->datalen >= sizeof(*elems->wide_bw_chansw_ie))
598 elems->wide_bw_chansw_ie =
599 (void *)subelem->data;
600 else
601 elem_parse_failed =
602 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
603 }
604
605 if (params->mode < IEEE80211_CONN_MODE_EHT)
606 break;
607
608 subelem = cfg80211_find_ext_elem(ext_eid: WLAN_EID_EXT_BANDWIDTH_INDICATION,
609 ies: pos, len: elen);
610 if (subelem) {
611 const void *edata = subelem->data + 1;
612 u8 edatalen = subelem->datalen - 1;
613
614 if (ieee80211_bandwidth_indication_size_ok(data: edata,
615 len: edatalen))
616 elems->bandwidth_indication = edata;
617 else
618 elem_parse_failed =
619 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
620 }
621
622 subelem = cfg80211_find_ext_elem(ext_eid: WLAN_EID_TX_POWER_ENVELOPE,
623 ies: pos, len: elen);
624 if (subelem)
625 ieee80211_parse_tpe(tpe: &elems->csa_tpe,
626 data: subelem->data + 1,
627 len: subelem->datalen - 1);
628 break;
629 case WLAN_EID_COUNTRY:
630 elems->country_elem = pos;
631 elems->country_elem_len = elen;
632 break;
633 case WLAN_EID_PWR_CONSTRAINT:
634 if (elen != 1) {
635 elem_parse_failed =
636 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
637 break;
638 }
639 elems->pwr_constr_elem = pos;
640 break;
641 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
642 /* Lots of different options exist, but we only care
643 * about the Dynamic Transmit Power Control element.
644 * First check for the Cisco OUI, then for the DTPC
645 * tag (0x00).
646 */
647 if (elen < 4) {
648 elem_parse_failed =
649 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
650 break;
651 }
652
653 if (pos[0] != 0x00 || pos[1] != 0x40 ||
654 pos[2] != 0x96 || pos[3] != 0x00)
655 break;
656
657 if (elen != 6) {
658 elem_parse_failed =
659 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
660 break;
661 }
662
663 if (calc_crc)
664 crc = crc32_be(crc, p: pos - 2, len: elen + 2);
665
666 elems->cisco_dtpc_elem = pos;
667 break;
668 case WLAN_EID_ADDBA_EXT:
669 if (elen < sizeof(struct ieee80211_addba_ext_ie)) {
670 elem_parse_failed =
671 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
672 break;
673 }
674 elems->addba_ext_ie = (void *)pos;
675 break;
676 case WLAN_EID_TIMEOUT_INTERVAL:
677 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
678 elems->timeout_int = (void *)pos;
679 else
680 elem_parse_failed =
681 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
682 break;
683 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
684 if (elen >= sizeof(*elems->max_idle_period_ie))
685 elems->max_idle_period_ie = (void *)pos;
686 break;
687 case WLAN_EID_RSNX:
688 elems->rsnx = pos;
689 elems->rsnx_len = elen;
690 break;
691 case WLAN_EID_TX_POWER_ENVELOPE:
692 if (params->mode < IEEE80211_CONN_MODE_HE)
693 break;
694 ieee80211_parse_tpe(tpe: &elems->tpe, data: pos, len: elen);
695 break;
696 case WLAN_EID_EXTENSION:
697 ieee80211_parse_extension_element(crc: calc_crc ?
698 &crc : NULL,
699 elem, elems_parse,
700 params);
701 break;
702 case WLAN_EID_S1G_CAPABILITIES:
703 if (params->mode != IEEE80211_CONN_MODE_S1G)
704 break;
705 if (elen >= sizeof(*elems->s1g_capab))
706 elems->s1g_capab = (void *)pos;
707 else
708 elem_parse_failed =
709 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
710 break;
711 case WLAN_EID_S1G_OPERATION:
712 if (params->mode != IEEE80211_CONN_MODE_S1G)
713 break;
714 if (elen == sizeof(*elems->s1g_oper))
715 elems->s1g_oper = (void *)pos;
716 else
717 elem_parse_failed =
718 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
719 break;
720 case WLAN_EID_S1G_BCN_COMPAT:
721 if (params->mode != IEEE80211_CONN_MODE_S1G)
722 break;
723 if (elen == sizeof(*elems->s1g_bcn_compat))
724 elems->s1g_bcn_compat = (void *)pos;
725 else
726 elem_parse_failed =
727 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
728 break;
729 case WLAN_EID_AID_RESPONSE:
730 if (params->mode != IEEE80211_CONN_MODE_S1G)
731 break;
732 if (elen == sizeof(struct ieee80211_aid_response_ie))
733 elems->aid_resp = (void *)pos;
734 else
735 elem_parse_failed =
736 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
737 break;
738 default:
739 break;
740 }
741
742 if (elem_parse_failed)
743 elems->parse_error |= elem_parse_failed;
744 else
745 __set_bit(id, seen_elems);
746 }
747
748 if (!for_each_element_completed(element: elem, data: params->start, datalen: params->len))
749 elems->parse_error |= IEEE80211_PARSE_ERR_INVALID_END;
750
751 return crc;
752}
753
754static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
755 struct ieee802_11_elems *elems,
756 struct cfg80211_bss *bss,
757 u8 *nontransmitted_profile)
758{
759 const struct element *elem, *sub;
760 size_t profile_len = 0;
761
762 if (!bss || !bss->transmitted_bss)
763 return profile_len;
764
765 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
766 if (elem->datalen < 2)
767 continue;
768 if (elem->data[0] < 1 || elem->data[0] > 8)
769 continue;
770
771 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
772 u8 new_bssid[ETH_ALEN];
773 const u8 *index;
774
775 if (sub->id != 0 || sub->datalen < 4) {
776 /* not a valid BSS profile */
777 continue;
778 }
779
780 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
781 sub->data[1] != 2) {
782 /* The first element of the
783 * Nontransmitted BSSID Profile is not
784 * the Nontransmitted BSSID Capability
785 * element.
786 */
787 continue;
788 }
789
790 memset(s: nontransmitted_profile, c: 0, n: len);
791 profile_len = cfg80211_merge_profile(ie: start, ielen: len,
792 mbssid_elem: elem,
793 sub_elem: sub,
794 merged_ie: nontransmitted_profile,
795 max_copy_len: len);
796
797 /* found a Nontransmitted BSSID Profile */
798 index = cfg80211_find_ie(eid: WLAN_EID_MULTI_BSSID_IDX,
799 ies: nontransmitted_profile,
800 len: profile_len);
801 if (!index || index[1] < 1 || index[2] == 0) {
802 /* Invalid MBSSID Index element */
803 continue;
804 }
805
806 cfg80211_gen_new_bssid(bssid: bss->transmitted_bss->bssid,
807 max_bssid: elem->data[0],
808 mbssid_index: index[2],
809 new_bssid);
810 if (ether_addr_equal(addr1: new_bssid, addr2: bss->bssid)) {
811 elems->bssid_index_len = index[1];
812 elems->bssid_index = (void *)&index[2];
813 return profile_len;
814 }
815 }
816 }
817
818 return 0;
819}
820
821static void
822ieee80211_mle_get_sta_prof(struct ieee80211_elems_parse *elems_parse,
823 u8 link_id)
824{
825 struct ieee802_11_elems *elems = &elems_parse->elems;
826 const struct ieee80211_multi_link_elem *ml = elems->ml_basic;
827 ssize_t ml_len = elems->ml_basic_len;
828 const struct element *sub;
829
830 for_each_mle_subelement(sub, (u8 *)ml, ml_len) {
831 struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data;
832 ssize_t sta_prof_len;
833 u16 control;
834
835 if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE)
836 continue;
837
838 if (!ieee80211_mle_basic_sta_prof_size_ok(data: sub->data,
839 len: sub->datalen))
840 return;
841
842 control = le16_to_cpu(prof->control);
843
844 if (link_id != u16_get_bits(v: control,
845 IEEE80211_MLE_STA_CONTROL_LINK_ID))
846 continue;
847
848 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
849 return;
850
851 /* the sub element can be fragmented */
852 sta_prof_len =
853 cfg80211_defragment_element(elem: sub,
854 ies: (u8 *)ml, ieslen: ml_len,
855 data: elems_parse->scratch_pos,
856 data_len: elems_parse->scratch +
857 elems_parse->scratch_len -
858 elems_parse->scratch_pos,
859 frag_id: IEEE80211_MLE_SUBELEM_FRAGMENT);
860
861 if (sta_prof_len < 0)
862 return;
863
864 elems->prof = (void *)elems_parse->scratch_pos;
865 elems->sta_prof_len = sta_prof_len;
866 elems_parse->scratch_pos += sta_prof_len;
867
868 return;
869 }
870}
871
872static const struct element *
873ieee80211_prep_mle_link_parse(struct ieee80211_elems_parse *elems_parse,
874 struct ieee80211_elems_parse_params *params,
875 struct ieee80211_elems_parse_params *sub)
876{
877 struct ieee802_11_elems *elems = &elems_parse->elems;
878 struct ieee80211_mle_per_sta_profile *prof;
879 const struct element *tmp;
880 ssize_t ml_len;
881 const u8 *end;
882
883 if (params->mode < IEEE80211_CONN_MODE_EHT)
884 return NULL;
885
886 for_each_element_extid(tmp, WLAN_EID_EXT_EHT_MULTI_LINK,
887 elems->ie_start, elems->total_len) {
888 const struct ieee80211_multi_link_elem *mle =
889 (void *)tmp->data + 1;
890
891 if (!ieee80211_mle_size_ok(data: tmp->data + 1, len: tmp->datalen - 1))
892 continue;
893
894 if (le16_get_bits(v: mle->control, IEEE80211_ML_CONTROL_TYPE) !=
895 IEEE80211_ML_CONTROL_TYPE_BASIC)
896 continue;
897
898 elems_parse->ml_basic_elem = tmp;
899 break;
900 }
901
902 ml_len = cfg80211_defragment_element(elem: elems_parse->ml_basic_elem,
903 ies: elems->ie_start,
904 ieslen: elems->total_len,
905 data: elems_parse->scratch_pos,
906 data_len: elems_parse->scratch +
907 elems_parse->scratch_len -
908 elems_parse->scratch_pos,
909 frag_id: WLAN_EID_FRAGMENT);
910
911 if (ml_len < 0)
912 return NULL;
913
914 elems->ml_basic = (const void *)elems_parse->scratch_pos;
915 elems->ml_basic_len = ml_len;
916 elems_parse->scratch_pos += ml_len;
917
918 if (params->link_id == -1)
919 return NULL;
920
921 ieee80211_mle_get_sta_prof(elems_parse, link_id: params->link_id);
922 prof = elems->prof;
923
924 if (!prof)
925 return NULL;
926
927 /* check if we have the 4 bytes for the fixed part in assoc response */
928 if (elems->sta_prof_len < sizeof(*prof) + prof->sta_info_len - 1 + 4) {
929 elems->prof = NULL;
930 elems->sta_prof_len = 0;
931 return NULL;
932 }
933
934 /*
935 * Skip the capability information and the status code that are expected
936 * as part of the station profile in association response frames. Note
937 * the -1 is because the 'sta_info_len' is accounted to as part of the
938 * per-STA profile, but not part of the 'u8 variable[]' portion.
939 */
940 sub->start = prof->variable + prof->sta_info_len - 1 + 4;
941 end = (const u8 *)prof + elems->sta_prof_len;
942 sub->len = end - sub->start;
943
944 sub->mode = params->mode;
945 sub->action = params->action;
946 sub->from_ap = params->from_ap;
947 sub->link_id = -1;
948
949 return cfg80211_find_ext_elem(ext_eid: WLAN_EID_EXT_NON_INHERITANCE,
950 ies: sub->start, len: sub->len);
951}
952
953static void
954ieee80211_mle_defrag_reconf(struct ieee80211_elems_parse *elems_parse)
955{
956 struct ieee802_11_elems *elems = &elems_parse->elems;
957 ssize_t ml_len;
958
959 ml_len = cfg80211_defragment_element(elem: elems_parse->ml_reconf_elem,
960 ies: elems->ie_start,
961 ieslen: elems->total_len,
962 data: elems_parse->scratch_pos,
963 data_len: elems_parse->scratch +
964 elems_parse->scratch_len -
965 elems_parse->scratch_pos,
966 frag_id: WLAN_EID_FRAGMENT);
967 if (ml_len < 0)
968 return;
969 elems->ml_reconf = (void *)elems_parse->scratch_pos;
970 elems->ml_reconf_len = ml_len;
971 elems_parse->scratch_pos += ml_len;
972}
973
974static void
975ieee80211_mle_defrag_epcs(struct ieee80211_elems_parse *elems_parse)
976{
977 struct ieee802_11_elems *elems = &elems_parse->elems;
978 ssize_t ml_len;
979
980 ml_len = cfg80211_defragment_element(elem: elems_parse->ml_epcs_elem,
981 ies: elems->ie_start,
982 ieslen: elems->total_len,
983 data: elems_parse->scratch_pos,
984 data_len: elems_parse->scratch +
985 elems_parse->scratch_len -
986 elems_parse->scratch_pos,
987 frag_id: WLAN_EID_FRAGMENT);
988 if (ml_len < 0)
989 return;
990 elems->ml_epcs = (void *)elems_parse->scratch_pos;
991 elems->ml_epcs_len = ml_len;
992 elems_parse->scratch_pos += ml_len;
993}
994
995struct ieee802_11_elems *
996ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
997{
998 struct ieee80211_elems_parse_params sub = {};
999 struct ieee80211_elems_parse *elems_parse;
1000 const struct element *non_inherit = NULL;
1001 struct ieee802_11_elems *elems;
1002 size_t scratch_len = 3 * params->len;
1003 bool multi_link_inner = false;
1004
1005 BUILD_BUG_ON(offsetof(typeof(*elems_parse), elems) != 0);
1006
1007 /* cannot parse for both a specific link and non-transmitted BSS */
1008 if (WARN_ON(params->link_id >= 0 && params->bss))
1009 return NULL;
1010
1011 elems_parse = kzalloc(struct_size(elems_parse, scratch, scratch_len),
1012 GFP_ATOMIC);
1013 if (!elems_parse)
1014 return NULL;
1015
1016 elems_parse->scratch_len = scratch_len;
1017 elems_parse->scratch_pos = elems_parse->scratch;
1018
1019 elems = &elems_parse->elems;
1020 elems->ie_start = params->start;
1021 elems->total_len = params->len;
1022
1023 /* set all TPE entries to unlimited (but invalid) */
1024 ieee80211_clear_tpe(tpe: &elems->tpe);
1025 ieee80211_clear_tpe(tpe: &elems->csa_tpe);
1026
1027 /*
1028 * If we're looking for a non-transmitted BSS then we cannot at
1029 * the same time be looking for a second link as the two can only
1030 * appear in the same frame carrying info for different BSSes.
1031 *
1032 * In any case, we only look for one at a time, as encoded by
1033 * the WARN_ON above.
1034 */
1035 if (params->bss) {
1036 int nontx_len =
1037 ieee802_11_find_bssid_profile(start: params->start,
1038 len: params->len,
1039 elems, bss: params->bss,
1040 nontransmitted_profile: elems_parse->scratch_pos);
1041 sub.start = elems_parse->scratch_pos;
1042 sub.mode = params->mode;
1043 sub.len = nontx_len;
1044 sub.action = params->action;
1045 sub.link_id = params->link_id;
1046
1047 /* consume the space used for non-transmitted profile */
1048 elems_parse->scratch_pos += nontx_len;
1049
1050 non_inherit = cfg80211_find_ext_elem(ext_eid: WLAN_EID_EXT_NON_INHERITANCE,
1051 ies: sub.start, len: nontx_len);
1052 } else {
1053 /* must always parse to get elems_parse->ml_basic_elem */
1054 non_inherit = ieee80211_prep_mle_link_parse(elems_parse, params,
1055 sub: &sub);
1056 multi_link_inner = true;
1057 }
1058
1059 elems_parse->skip_vendor =
1060 cfg80211_find_elem(eid: WLAN_EID_VENDOR_SPECIFIC,
1061 ies: sub.start, len: sub.len);
1062 elems->crc = _ieee802_11_parse_elems_full(params, elems_parse,
1063 check_inherit: non_inherit);
1064
1065 /* Override with nontransmitted/per-STA profile if found */
1066 if (sub.len) {
1067 elems_parse->multi_link_inner = multi_link_inner;
1068 elems_parse->skip_vendor = false;
1069 _ieee802_11_parse_elems_full(params: &sub, elems_parse, NULL);
1070 }
1071
1072 ieee80211_mle_defrag_reconf(elems_parse);
1073
1074 ieee80211_mle_defrag_epcs(elems_parse);
1075
1076 if (elems->tim && !elems->parse_error) {
1077 const struct ieee80211_tim_ie *tim_ie = elems->tim;
1078
1079 elems->dtim_period = tim_ie->dtim_period;
1080 elems->dtim_count = tim_ie->dtim_count;
1081 }
1082
1083 /* Override DTIM period and count if needed */
1084 if (elems->bssid_index &&
1085 elems->bssid_index_len >=
1086 offsetofend(struct ieee80211_bssid_index, dtim_period))
1087 elems->dtim_period = elems->bssid_index->dtim_period;
1088
1089 if (elems->bssid_index &&
1090 elems->bssid_index_len >=
1091 offsetofend(struct ieee80211_bssid_index, dtim_count))
1092 elems->dtim_count = elems->bssid_index->dtim_count;
1093
1094 return elems;
1095}
1096EXPORT_SYMBOL_IF_KUNIT(ieee802_11_parse_elems_full);
1097
1098int ieee80211_parse_bitrates(enum nl80211_chan_width width,
1099 const struct ieee80211_supported_band *sband,
1100 const u8 *srates, int srates_len, u32 *rates)
1101{
1102 struct ieee80211_rate *br;
1103 int brate, rate, i, j, count = 0;
1104
1105 *rates = 0;
1106
1107 for (i = 0; i < srates_len; i++) {
1108 rate = srates[i] & 0x7f;
1109
1110 for (j = 0; j < sband->n_bitrates; j++) {
1111 br = &sband->bitrates[j];
1112
1113 brate = DIV_ROUND_UP(br->bitrate, 5);
1114 if (brate == rate) {
1115 *rates |= BIT(j);
1116 count++;
1117 break;
1118 }
1119 }
1120 }
1121 return count;
1122}
1123