Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Wireless utility functions
4 *
5 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2021 Intel Corporation
9 */
10#include <linux/export.h>
11#include <linux/bitops.h>
12#include <linux/etherdevice.h>
13#include <linux/slab.h>
14#include <linux/ieee80211.h>
15#include <net/cfg80211.h>
16#include <net/ip.h>
17#include <net/dsfield.h>
18#include <linux/if_vlan.h>
19#include <linux/mpls.h>
20#include <linux/gcd.h>
21#include <linux/bitfield.h>
22#include <linux/nospec.h>
23#include "core.h"
24#include "rdev-ops.h"
25
26
27const struct ieee80211_rate *
28ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
29 u32 basic_rates, int bitrate)
30{
31 struct ieee80211_rate *result = &sband->bitrates[0];
32 int i;
33
34 for (i = 0; i < sband->n_bitrates; i++) {
35 if (!(basic_rates & BIT(i)))
36 continue;
37 if (sband->bitrates[i].bitrate > bitrate)
38 continue;
39 result = &sband->bitrates[i];
40 }
41
42 return result;
43}
44EXPORT_SYMBOL(ieee80211_get_response_rate);
45
46u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
47 enum nl80211_bss_scan_width scan_width)
48{
49 struct ieee80211_rate *bitrates;
50 u32 mandatory_rates = 0;
51 enum ieee80211_rate_flags mandatory_flag;
52 int i;
53
54 if (WARN_ON(!sband))
55 return 1;
56
57 if (sband->band == NL80211_BAND_2GHZ) {
58 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
59 scan_width == NL80211_BSS_CHAN_WIDTH_10)
60 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
61 else
62 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
63 } else {
64 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
65 }
66
67 bitrates = sband->bitrates;
68 for (i = 0; i < sband->n_bitrates; i++)
69 if (bitrates[i].flags & mandatory_flag)
70 mandatory_rates |= BIT(i);
71 return mandatory_rates;
72}
73EXPORT_SYMBOL(ieee80211_mandatory_rates);
74
75u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
76{
77 /* see 802.11 17.3.8.3.2 and Annex J
78 * there are overlapping channel numbers in 5GHz and 2GHz bands */
79 if (chan <= 0)
80 return 0; /* not supported */
81 switch (band) {
82 case NL80211_BAND_2GHZ:
83 case NL80211_BAND_LC:
84 if (chan == 14)
85 return MHZ_TO_KHZ(2484);
86 else if (chan < 14)
87 return MHZ_TO_KHZ(2407 + chan * 5);
88 break;
89 case NL80211_BAND_5GHZ:
90 if (chan >= 182 && chan <= 196)
91 return MHZ_TO_KHZ(4000 + chan * 5);
92 else
93 return MHZ_TO_KHZ(5000 + chan * 5);
94 break;
95 case NL80211_BAND_6GHZ:
96 /* see 802.11ax D6.1 27.3.23.2 */
97 if (chan == 2)
98 return MHZ_TO_KHZ(5935);
99 if (chan <= 233)
100 return MHZ_TO_KHZ(5950 + chan * 5);
101 break;
102 case NL80211_BAND_60GHZ:
103 if (chan < 7)
104 return MHZ_TO_KHZ(56160 + chan * 2160);
105 break;
106 case NL80211_BAND_S1GHZ:
107 return 902000 + chan * 500;
108 default:
109 ;
110 }
111 return 0; /* not supported */
112}
113EXPORT_SYMBOL(ieee80211_channel_to_freq_khz);
114
115enum nl80211_chan_width
116ieee80211_s1g_channel_width(const struct ieee80211_channel *chan)
117{
118 if (WARN_ON(!chan || chan->band != NL80211_BAND_S1GHZ))
119 return NL80211_CHAN_WIDTH_20_NOHT;
120
121 /*S1G defines a single allowed channel width per channel.
122 * Extract that width here.
123 */
124 if (chan->flags & IEEE80211_CHAN_1MHZ)
125 return NL80211_CHAN_WIDTH_1;
126 else if (chan->flags & IEEE80211_CHAN_2MHZ)
127 return NL80211_CHAN_WIDTH_2;
128 else if (chan->flags & IEEE80211_CHAN_4MHZ)
129 return NL80211_CHAN_WIDTH_4;
130 else if (chan->flags & IEEE80211_CHAN_8MHZ)
131 return NL80211_CHAN_WIDTH_8;
132 else if (chan->flags & IEEE80211_CHAN_16MHZ)
133 return NL80211_CHAN_WIDTH_16;
134
135 pr_err("unknown channel width for channel at %dKHz?\n",
136 ieee80211_channel_to_khz(chan));
137
138 return NL80211_CHAN_WIDTH_1;
139}
140EXPORT_SYMBOL(ieee80211_s1g_channel_width);
141
142int ieee80211_freq_khz_to_channel(u32 freq)
143{
144 /* TODO: just handle MHz for now */
145 freq = KHZ_TO_MHZ(freq);
146
147 /* see 802.11 17.3.8.3.2 and Annex J */
148 if (freq == 2484)
149 return 14;
150 else if (freq < 2484)
151 return (freq - 2407) / 5;
152 else if (freq >= 4910 && freq <= 4980)
153 return (freq - 4000) / 5;
154 else if (freq < 5925)
155 return (freq - 5000) / 5;
156 else if (freq == 5935)
157 return 2;
158 else if (freq <= 45000) /* DMG band lower limit */
159 /* see 802.11ax D6.1 27.3.22.2 */
160 return (freq - 5950) / 5;
161 else if (freq >= 58320 && freq <= 70200)
162 return (freq - 56160) / 2160;
163 else
164 return 0;
165}
166EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
167
168struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
169 u32 freq)
170{
171 enum nl80211_band band;
172 struct ieee80211_supported_band *sband;
173 int i;
174
175 for (band = 0; band < NUM_NL80211_BANDS; band++) {
176 sband = wiphy->bands[band];
177
178 if (!sband)
179 continue;
180
181 for (i = 0; i < sband->n_channels; i++) {
182 struct ieee80211_channel *chan = &sband->channels[i];
183
184 if (ieee80211_channel_to_khz(chan) == freq)
185 return chan;
186 }
187 }
188
189 return NULL;
190}
191EXPORT_SYMBOL(ieee80211_get_channel_khz);
192
193static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
194{
195 int i, want;
196
197 switch (sband->band) {
198 case NL80211_BAND_5GHZ:
199 case NL80211_BAND_6GHZ:
200 want = 3;
201 for (i = 0; i < sband->n_bitrates; i++) {
202 if (sband->bitrates[i].bitrate == 60 ||
203 sband->bitrates[i].bitrate == 120 ||
204 sband->bitrates[i].bitrate == 240) {
205 sband->bitrates[i].flags |=
206 IEEE80211_RATE_MANDATORY_A;
207 want--;
208 }
209 }
210 WARN_ON(want);
211 break;
212 case NL80211_BAND_2GHZ:
213 case NL80211_BAND_LC:
214 want = 7;
215 for (i = 0; i < sband->n_bitrates; i++) {
216 switch (sband->bitrates[i].bitrate) {
217 case 10:
218 case 20:
219 case 55:
220 case 110:
221 sband->bitrates[i].flags |=
222 IEEE80211_RATE_MANDATORY_B |
223 IEEE80211_RATE_MANDATORY_G;
224 want--;
225 break;
226 case 60:
227 case 120:
228 case 240:
229 sband->bitrates[i].flags |=
230 IEEE80211_RATE_MANDATORY_G;
231 want--;
232 fallthrough;
233 default:
234 sband->bitrates[i].flags |=
235 IEEE80211_RATE_ERP_G;
236 break;
237 }
238 }
239 WARN_ON(want != 0 && want != 3);
240 break;
241 case NL80211_BAND_60GHZ:
242 /* check for mandatory HT MCS 1..4 */
243 WARN_ON(!sband->ht_cap.ht_supported);
244 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
245 break;
246 case NL80211_BAND_S1GHZ:
247 /* Figure 9-589bd: 3 means unsupported, so != 3 means at least
248 * mandatory is ok.
249 */
250 WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
251 break;
252 case NUM_NL80211_BANDS:
253 default:
254 WARN_ON(1);
255 break;
256 }
257}
258
259void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
260{
261 enum nl80211_band band;
262
263 for (band = 0; band < NUM_NL80211_BANDS; band++)
264 if (wiphy->bands[band])
265 set_mandatory_flags_band(wiphy->bands[band]);
266}
267
268bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
269{
270 int i;
271 for (i = 0; i < wiphy->n_cipher_suites; i++)
272 if (cipher == wiphy->cipher_suites[i])
273 return true;
274 return false;
275}
276
277static bool
278cfg80211_igtk_cipher_supported(struct cfg80211_registered_device *rdev)
279{
280 struct wiphy *wiphy = &rdev->wiphy;
281 int i;
282
283 for (i = 0; i < wiphy->n_cipher_suites; i++) {
284 switch (wiphy->cipher_suites[i]) {
285 case WLAN_CIPHER_SUITE_AES_CMAC:
286 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
287 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
288 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
289 return true;
290 }
291 }
292
293 return false;
294}
295
296bool cfg80211_valid_key_idx(struct cfg80211_registered_device *rdev,
297 int key_idx, bool pairwise)
298{
299 int max_key_idx;
300
301 if (pairwise)
302 max_key_idx = 3;
303 else if (wiphy_ext_feature_isset(&rdev->wiphy,
304 NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
305 wiphy_ext_feature_isset(&rdev->wiphy,
306 NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
307 max_key_idx = 7;
308 else if (cfg80211_igtk_cipher_supported(rdev))
309 max_key_idx = 5;
310 else
311 max_key_idx = 3;
312
313 if (key_idx < 0 || key_idx > max_key_idx)
314 return false;
315
316 return true;
317}
318
319int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
320 struct key_params *params, int key_idx,
321 bool pairwise, const u8 *mac_addr)
322{
323 if (!cfg80211_valid_key_idx(rdev, key_idx, pairwise))
324 return -EINVAL;
325
326 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
327 return -EINVAL;
328
329 if (pairwise && !mac_addr)
330 return -EINVAL;
331
332 switch (params->cipher) {
333 case WLAN_CIPHER_SUITE_TKIP:
334 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
335 if ((pairwise && key_idx) ||
336 params->mode != NL80211_KEY_RX_TX)
337 return -EINVAL;
338 break;
339 case WLAN_CIPHER_SUITE_CCMP:
340 case WLAN_CIPHER_SUITE_CCMP_256:
341 case WLAN_CIPHER_SUITE_GCMP:
342 case WLAN_CIPHER_SUITE_GCMP_256:
343 /* IEEE802.11-2016 allows only 0 and - when supporting
344 * Extended Key ID - 1 as index for pairwise keys.
345 * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
346 * the driver supports Extended Key ID.
347 * @NL80211_KEY_SET_TX can't be set when installing and
348 * validating a key.
349 */
350 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
351 params->mode == NL80211_KEY_SET_TX)
352 return -EINVAL;
353 if (wiphy_ext_feature_isset(&rdev->wiphy,
354 NL80211_EXT_FEATURE_EXT_KEY_ID)) {
355 if (pairwise && (key_idx < 0 || key_idx > 1))
356 return -EINVAL;
357 } else if (pairwise && key_idx) {
358 return -EINVAL;
359 }
360 break;
361 case WLAN_CIPHER_SUITE_AES_CMAC:
362 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
363 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
364 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
365 /* Disallow BIP (group-only) cipher as pairwise cipher */
366 if (pairwise)
367 return -EINVAL;
368 if (key_idx < 4)
369 return -EINVAL;
370 break;
371 case WLAN_CIPHER_SUITE_WEP40:
372 case WLAN_CIPHER_SUITE_WEP104:
373 if (key_idx > 3)
374 return -EINVAL;
375 break;
376 default:
377 break;
378 }
379
380 switch (params->cipher) {
381 case WLAN_CIPHER_SUITE_WEP40:
382 if (params->key_len != WLAN_KEY_LEN_WEP40)
383 return -EINVAL;
384 break;
385 case WLAN_CIPHER_SUITE_TKIP:
386 if (params->key_len != WLAN_KEY_LEN_TKIP)
387 return -EINVAL;
388 break;
389 case WLAN_CIPHER_SUITE_CCMP:
390 if (params->key_len != WLAN_KEY_LEN_CCMP)
391 return -EINVAL;
392 break;
393 case WLAN_CIPHER_SUITE_CCMP_256:
394 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
395 return -EINVAL;
396 break;
397 case WLAN_CIPHER_SUITE_GCMP:
398 if (params->key_len != WLAN_KEY_LEN_GCMP)
399 return -EINVAL;
400 break;
401 case WLAN_CIPHER_SUITE_GCMP_256:
402 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
403 return -EINVAL;
404 break;
405 case WLAN_CIPHER_SUITE_WEP104:
406 if (params->key_len != WLAN_KEY_LEN_WEP104)
407 return -EINVAL;
408 break;
409 case WLAN_CIPHER_SUITE_AES_CMAC:
410 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
411 return -EINVAL;
412 break;
413 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
414 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
415 return -EINVAL;
416 break;
417 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
418 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
419 return -EINVAL;
420 break;
421 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
422 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
423 return -EINVAL;
424 break;
425 default:
426 /*
427 * We don't know anything about this algorithm,
428 * allow using it -- but the driver must check
429 * all parameters! We still check below whether
430 * or not the driver supports this algorithm,
431 * of course.
432 */
433 break;
434 }
435
436 if (params->seq) {
437 switch (params->cipher) {
438 case WLAN_CIPHER_SUITE_WEP40:
439 case WLAN_CIPHER_SUITE_WEP104:
440 /* These ciphers do not use key sequence */
441 return -EINVAL;
442 case WLAN_CIPHER_SUITE_TKIP:
443 case WLAN_CIPHER_SUITE_CCMP:
444 case WLAN_CIPHER_SUITE_CCMP_256:
445 case WLAN_CIPHER_SUITE_GCMP:
446 case WLAN_CIPHER_SUITE_GCMP_256:
447 case WLAN_CIPHER_SUITE_AES_CMAC:
448 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
449 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
450 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
451 if (params->seq_len != 6)
452 return -EINVAL;
453 break;
454 }
455 }
456
457 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
458 return -EINVAL;
459
460 return 0;
461}
462
463unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
464{
465 unsigned int hdrlen = 24;
466
467 if (ieee80211_is_ext(fc)) {
468 hdrlen = 4;
469 goto out;
470 }
471
472 if (ieee80211_is_data(fc)) {
473 if (ieee80211_has_a4(fc))
474 hdrlen = 30;
475 if (ieee80211_is_data_qos(fc)) {
476 hdrlen += IEEE80211_QOS_CTL_LEN;
477 if (ieee80211_has_order(fc))
478 hdrlen += IEEE80211_HT_CTL_LEN;
479 }
480 goto out;
481 }
482
483 if (ieee80211_is_mgmt(fc)) {
484 if (ieee80211_has_order(fc))
485 hdrlen += IEEE80211_HT_CTL_LEN;
486 goto out;
487 }
488
489 if (ieee80211_is_ctl(fc)) {
490 /*
491 * ACK and CTS are 10 bytes, all others 16. To see how
492 * to get this condition consider
493 * subtype mask: 0b0000000011110000 (0x00F0)
494 * ACK subtype: 0b0000000011010000 (0x00D0)
495 * CTS subtype: 0b0000000011000000 (0x00C0)
496 * bits that matter: ^^^ (0x00E0)
497 * value of those: 0b0000000011000000 (0x00C0)
498 */
499 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
500 hdrlen = 10;
501 else
502 hdrlen = 16;
503 }
504out:
505 return hdrlen;
506}
507EXPORT_SYMBOL(ieee80211_hdrlen);
508
509unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
510{
511 const struct ieee80211_hdr *hdr =
512 (const struct ieee80211_hdr *)skb->data;
513 unsigned int hdrlen;
514
515 if (unlikely(skb->len < 10))
516 return 0;
517 hdrlen = ieee80211_hdrlen(hdr->frame_control);
518 if (unlikely(hdrlen > skb->len))
519 return 0;
520 return hdrlen;
521}
522EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
523
524static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
525{
526 int ae = flags & MESH_FLAGS_AE;
527 /* 802.11-2012, 8.2.4.7.3 */
528 switch (ae) {
529 default:
530 case 0:
531 return 6;
532 case MESH_FLAGS_AE_A4:
533 return 12;
534 case MESH_FLAGS_AE_A5_A6:
535 return 18;
536 }
537}
538
539unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
540{
541 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
542}
543EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
544
545int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
546 const u8 *addr, enum nl80211_iftype iftype,
547 u8 data_offset, bool is_amsdu)
548{
549 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
550 struct {
551 u8 hdr[ETH_ALEN] __aligned(2);
552 __be16 proto;
553 } payload;
554 struct ethhdr tmp;
555 u16 hdrlen;
556 u8 mesh_flags = 0;
557
558 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
559 return -1;
560
561 hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
562 if (skb->len < hdrlen + 8)
563 return -1;
564
565 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
566 * header
567 * IEEE 802.11 address fields:
568 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
569 * 0 0 DA SA BSSID n/a
570 * 0 1 DA BSSID SA n/a
571 * 1 0 BSSID SA DA n/a
572 * 1 1 RA TA DA SA
573 */
574 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
575 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
576
577 if (iftype == NL80211_IFTYPE_MESH_POINT)
578 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
579
580 mesh_flags &= MESH_FLAGS_AE;
581
582 switch (hdr->frame_control &
583 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
584 case cpu_to_le16(IEEE80211_FCTL_TODS):
585 if (unlikely(iftype != NL80211_IFTYPE_AP &&
586 iftype != NL80211_IFTYPE_AP_VLAN &&
587 iftype != NL80211_IFTYPE_P2P_GO))
588 return -1;
589 break;
590 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
591 if (unlikely(iftype != NL80211_IFTYPE_MESH_POINT &&
592 iftype != NL80211_IFTYPE_AP_VLAN &&
593 iftype != NL80211_IFTYPE_STATION))
594 return -1;
595 if (iftype == NL80211_IFTYPE_MESH_POINT) {
596 if (mesh_flags == MESH_FLAGS_AE_A4)
597 return -1;
598 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
599 skb_copy_bits(skb, hdrlen +
600 offsetof(struct ieee80211s_hdr, eaddr1),
601 tmp.h_dest, 2 * ETH_ALEN);
602 }
603 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
604 }
605 break;
606 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
607 if ((iftype != NL80211_IFTYPE_STATION &&
608 iftype != NL80211_IFTYPE_P2P_CLIENT &&
609 iftype != NL80211_IFTYPE_MESH_POINT) ||
610 (is_multicast_ether_addr(tmp.h_dest) &&
611 ether_addr_equal(tmp.h_source, addr)))
612 return -1;
613 if (iftype == NL80211_IFTYPE_MESH_POINT) {
614 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
615 return -1;
616 if (mesh_flags == MESH_FLAGS_AE_A4)
617 skb_copy_bits(skb, hdrlen +
618 offsetof(struct ieee80211s_hdr, eaddr1),
619 tmp.h_source, ETH_ALEN);
620 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
621 }
622 break;
623 case cpu_to_le16(0):
624 if (iftype != NL80211_IFTYPE_ADHOC &&
625 iftype != NL80211_IFTYPE_STATION &&
626 iftype != NL80211_IFTYPE_OCB)
627 return -1;
628 break;
629 }
630
631 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
632 tmp.h_proto = payload.proto;
633
634 if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
635 tmp.h_proto != htons(ETH_P_AARP) &&
636 tmp.h_proto != htons(ETH_P_IPX)) ||
637 ether_addr_equal(payload.hdr, bridge_tunnel_header))) {
638 /* remove RFC1042 or Bridge-Tunnel encapsulation and
639 * replace EtherType */
640 hdrlen += ETH_ALEN + 2;
641 skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
642 } else {
643 tmp.h_proto = htons(skb->len - hdrlen);
644 }
645
646 pskb_pull(skb, hdrlen);
647
648 if (!ehdr)
649 ehdr = skb_push(skb, sizeof(struct ethhdr));
650 memcpy(ehdr, &tmp, sizeof(tmp));
651
652 return 0;
653}
654EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
655
656static void
657__frame_add_frag(struct sk_buff *skb, struct page *page,
658 void *ptr, int len, int size)
659{
660 struct skb_shared_info *sh = skb_shinfo(skb);
661 int page_offset;
662
663 get_page(page);
664 page_offset = ptr - page_address(page);
665 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
666}
667
668static void
669__ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
670 int offset, int len)
671{
672 struct skb_shared_info *sh = skb_shinfo(skb);
673 const skb_frag_t *frag = &sh->frags[0];
674 struct page *frag_page;
675 void *frag_ptr;
676 int frag_len, frag_size;
677 int head_size = skb->len - skb->data_len;
678 int cur_len;
679
680 frag_page = virt_to_head_page(skb->head);
681 frag_ptr = skb->data;
682 frag_size = head_size;
683
684 while (offset >= frag_size) {
685 offset -= frag_size;
686 frag_page = skb_frag_page(frag);
687 frag_ptr = skb_frag_address(frag);
688 frag_size = skb_frag_size(frag);
689 frag++;
690 }
691
692 frag_ptr += offset;
693 frag_len = frag_size - offset;
694
695 cur_len = min(len, frag_len);
696
697 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
698 len -= cur_len;
699
700 while (len > 0) {
701 frag_len = skb_frag_size(frag);
702 cur_len = min(len, frag_len);
703 __frame_add_frag(frame, skb_frag_page(frag),
704 skb_frag_address(frag), cur_len, frag_len);
705 len -= cur_len;
706 frag++;
707 }
708}
709
710static struct sk_buff *
711__ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
712 int offset, int len, bool reuse_frag)
713{
714 struct sk_buff *frame;
715 int cur_len = len;
716
717 if (skb->len - offset < len)
718 return NULL;
719
720 /*
721 * When reusing framents, copy some data to the head to simplify
722 * ethernet header handling and speed up protocol header processing
723 * in the stack later.
724 */
725 if (reuse_frag)
726 cur_len = min_t(int, len, 32);
727
728 /*
729 * Allocate and reserve two bytes more for payload
730 * alignment since sizeof(struct ethhdr) is 14.
731 */
732 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
733 if (!frame)
734 return NULL;
735
736 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
737 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
738
739 len -= cur_len;
740 if (!len)
741 return frame;
742
743 offset += cur_len;
744 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
745
746 return frame;
747}
748
749void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
750 const u8 *addr, enum nl80211_iftype iftype,
751 const unsigned int extra_headroom,
752 const u8 *check_da, const u8 *check_sa)
753{
754 unsigned int hlen = ALIGN(extra_headroom, 4);
755 struct sk_buff *frame = NULL;
756 u16 ethertype;
757 u8 *payload;
758 int offset = 0, remaining;
759 struct ethhdr eth;
760 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
761 bool reuse_skb = false;
762 bool last = false;
763
764 while (!last) {
765 unsigned int subframe_len;
766 int len;
767 u8 padding;
768
769 skb_copy_bits(skb, offset, ð, sizeof(eth));
770 len = ntohs(eth.h_proto);
771 subframe_len = sizeof(struct ethhdr) + len;
772 padding = (4 - subframe_len) & 0x3;
773
774 /* the last MSDU has no padding */
775 remaining = skb->len - offset;
776 if (subframe_len > remaining)
777 goto purge;
778 /* mitigate A-MSDU aggregation injection attacks */
779 if (ether_addr_equal(eth.h_dest, rfc1042_header))
780 goto purge;
781
782 offset += sizeof(struct ethhdr);
783 last = remaining <= subframe_len + padding;
784
785 /* FIXME: should we really accept multicast DA? */
786 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
787 !ether_addr_equal(check_da, eth.h_dest)) ||
788 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
789 offset += len + padding;
790 continue;
791 }
792
793 /* reuse skb for the last subframe */
794 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
795 skb_pull(skb, offset);
796 frame = skb;
797 reuse_skb = true;
798 } else {
799 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
800 reuse_frag);
801 if (!frame)
802 goto purge;
803
804 offset += len + padding;
805 }
806
807 skb_reset_network_header(frame);
808 frame->dev = skb->dev;
809 frame->priority = skb->priority;
810
811 payload = frame->data;
812 ethertype = (payload[6] << 8) | payload[7];
813 if (likely((ether_addr_equal(payload, rfc1042_header) &&
814 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
815 ether_addr_equal(payload, bridge_tunnel_header))) {
816 eth.h_proto = htons(ethertype);
817 skb_pull(frame, ETH_ALEN + 2);
818 }
819
820 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
821 __skb_queue_tail(list, frame);
822 }
823
824 if (!reuse_skb)
825 dev_kfree_skb(skb);
826
827 return;
828
829 purge:
830 __skb_queue_purge(list);
831 dev_kfree_skb(skb);
832}
833EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
834
835/* Given a data frame determine the 802.1p/1d tag to use. */
836unsigned int cfg80211_classify8021d(struct sk_buff *skb,
837 struct cfg80211_qos_map *qos_map)
838{
839 unsigned int dscp;
840 unsigned char vlan_priority;
841 unsigned int ret;
842
843 /* skb->priority values from 256->263 are magic values to
844 * directly indicate a specific 802.1d priority. This is used
845 * to allow 802.1d priority to be passed directly in from VLAN
846 * tags, etc.
847 */
848 if (skb->priority >= 256 && skb->priority <= 263) {
849 ret = skb->priority - 256;
850 goto out;
851 }
852
853 if (skb_vlan_tag_present(skb)) {
854 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
855 >> VLAN_PRIO_SHIFT;
856 if (vlan_priority > 0) {
857 ret = vlan_priority;
858 goto out;
859 }
860 }
861
862 switch (skb->protocol) {
863 case htons(ETH_P_IP):
864 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
865 break;
866 case htons(ETH_P_IPV6):
867 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
868 break;
869 case htons(ETH_P_MPLS_UC):
870 case htons(ETH_P_MPLS_MC): {
871 struct mpls_label mpls_tmp, *mpls;
872
873 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
874 sizeof(*mpls), &mpls_tmp);
875 if (!mpls)
876 return 0;
877
878 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
879 >> MPLS_LS_TC_SHIFT;
880 goto out;
881 }
882 case htons(ETH_P_80221):
883 /* 802.21 is always network control traffic */
884 return 7;
885 default:
886 return 0;
887 }
888
889 if (qos_map) {
890 unsigned int i, tmp_dscp = dscp >> 2;
891
892 for (i = 0; i < qos_map->num_des; i++) {
893 if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
894 ret = qos_map->dscp_exception[i].up;
895 goto out;
896 }
897 }
898
899 for (i = 0; i < 8; i++) {
900 if (tmp_dscp >= qos_map->up[i].low &&
901 tmp_dscp <= qos_map->up[i].high) {
902 ret = i;
903 goto out;
904 }
905 }
906 }
907
908 ret = dscp >> 5;
909out:
910 return array_index_nospec(ret, IEEE80211_NUM_TIDS);
911}
912EXPORT_SYMBOL(cfg80211_classify8021d);
913
914const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
915{
916 const struct cfg80211_bss_ies *ies;
917
918 ies = rcu_dereference(bss->ies);
919 if (!ies)
920 return NULL;
921
922 return cfg80211_find_elem(id, ies->data, ies->len);
923}
924EXPORT_SYMBOL(ieee80211_bss_get_elem);
925
926void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
927{
928 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
929 struct net_device *dev = wdev->netdev;
930 int i;
931
932 if (!wdev->connect_keys)
933 return;
934
935 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
936 if (!wdev->connect_keys->params[i].cipher)
937 continue;
938 if (rdev_add_key(rdev, dev, i, false, NULL,
939 &wdev->connect_keys->params[i])) {
940 netdev_err(dev, "failed to set key %d\n", i);
941 continue;
942 }
943 if (wdev->connect_keys->def == i &&
944 rdev_set_default_key(rdev, dev, i, true, true)) {
945 netdev_err(dev, "failed to set defkey %d\n", i);
946 continue;
947 }
948 }
949
950 kfree_sensitive(wdev->connect_keys);
951 wdev->connect_keys = NULL;
952}
953
954void cfg80211_process_wdev_events(struct wireless_dev *wdev)
955{
956 struct cfg80211_event *ev;
957 unsigned long flags;
958
959 spin_lock_irqsave(&wdev->event_lock, flags);
960 while (!list_empty(&wdev->event_list)) {
961 ev = list_first_entry(&wdev->event_list,
962 struct cfg80211_event, list);
963 list_del(&ev->list);
964 spin_unlock_irqrestore(&wdev->event_lock, flags);
965
966 wdev_lock(wdev);
967 switch (ev->type) {
968 case EVENT_CONNECT_RESULT:
969 __cfg80211_connect_result(
970 wdev->netdev,
971 &ev->cr,
972 ev->cr.status == WLAN_STATUS_SUCCESS);
973 break;
974 case EVENT_ROAMED:
975 __cfg80211_roamed(wdev, &ev->rm);
976 break;
977 case EVENT_DISCONNECTED:
978 __cfg80211_disconnected(wdev->netdev,
979 ev->dc.ie, ev->dc.ie_len,
980 ev->dc.reason,
981 !ev->dc.locally_generated);
982 break;
983 case EVENT_IBSS_JOINED:
984 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
985 ev->ij.channel);
986 break;
987 case EVENT_STOPPED:
988 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
989 break;
990 case EVENT_PORT_AUTHORIZED:
991 __cfg80211_port_authorized(wdev, ev->pa.bssid);
992 break;
993 }
994 wdev_unlock(wdev);
995
996 kfree(ev);
997
998 spin_lock_irqsave(&wdev->event_lock, flags);
999 }
1000 spin_unlock_irqrestore(&wdev->event_lock, flags);
1001}
1002
1003void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
1004{
1005 struct wireless_dev *wdev;
1006
1007 lockdep_assert_held(&rdev->wiphy.mtx);
1008
1009 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
1010 cfg80211_process_wdev_events(wdev);
1011}
1012
1013int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
1014 struct net_device *dev, enum nl80211_iftype ntype,
1015 struct vif_params *params)
1016{
1017 int err;
1018 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1019
1020 lockdep_assert_held(&rdev->wiphy.mtx);
1021
1022 /* don't support changing VLANs, you just re-create them */
1023 if (otype == NL80211_IFTYPE_AP_VLAN)
1024 return -EOPNOTSUPP;
1025
1026 /* cannot change into P2P device or NAN */
1027 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1028 ntype == NL80211_IFTYPE_NAN)
1029 return -EOPNOTSUPP;
1030
1031 if (!rdev->ops->change_virtual_intf ||
1032 !(rdev->wiphy.interface_modes & (1 << ntype)))
1033 return -EOPNOTSUPP;
1034
1035 if (ntype != otype) {
1036 /* if it's part of a bridge, reject changing type to station/ibss */
1037 if (netif_is_bridge_port(dev) &&
1038 (ntype == NL80211_IFTYPE_ADHOC ||
1039 ntype == NL80211_IFTYPE_STATION ||
1040 ntype == NL80211_IFTYPE_P2P_CLIENT))
1041 return -EBUSY;
1042
1043 dev->ieee80211_ptr->use_4addr = false;
1044 dev->ieee80211_ptr->mesh_id_up_len = 0;
1045 wdev_lock(dev->ieee80211_ptr);
1046 rdev_set_qos_map(rdev, dev, NULL);
1047 wdev_unlock(dev->ieee80211_ptr);
1048
1049 switch (otype) {
1050 case NL80211_IFTYPE_AP:
1051 case NL80211_IFTYPE_P2P_GO:
1052 cfg80211_stop_ap(rdev, dev, true);
1053 break;
1054 case NL80211_IFTYPE_ADHOC:
1055 cfg80211_leave_ibss(rdev, dev, false);
1056 break;
1057 case NL80211_IFTYPE_STATION:
1058 case NL80211_IFTYPE_P2P_CLIENT:
1059 wdev_lock(dev->ieee80211_ptr);
1060 cfg80211_disconnect(rdev, dev,
1061 WLAN_REASON_DEAUTH_LEAVING, true);
1062 wdev_unlock(dev->ieee80211_ptr);
1063 break;
1064 case NL80211_IFTYPE_MESH_POINT:
1065 /* mesh should be handled? */
1066 break;
1067 case NL80211_IFTYPE_OCB:
1068 cfg80211_leave_ocb(rdev, dev);
1069 break;
1070 default:
1071 break;
1072 }
1073
1074 cfg80211_process_rdev_events(rdev);
1075 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1076 }
1077
1078 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1079
1080 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1081
1082 if (!err && params && params->use_4addr != -1)
1083 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1084
1085 if (!err) {
1086 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1087 switch (ntype) {
1088 case NL80211_IFTYPE_STATION:
1089 if (dev->ieee80211_ptr->use_4addr)
1090 break;
1091 fallthrough;
1092 case NL80211_IFTYPE_OCB:
1093 case NL80211_IFTYPE_P2P_CLIENT:
1094 case NL80211_IFTYPE_ADHOC:
1095 dev->priv_flags |= IFF_DONT_BRIDGE;
1096 break;
1097 case NL80211_IFTYPE_P2P_GO:
1098 case NL80211_IFTYPE_AP:
1099 case NL80211_IFTYPE_AP_VLAN:
1100 case NL80211_IFTYPE_MESH_POINT:
1101 /* bridging OK */
1102 break;
1103 case NL80211_IFTYPE_MONITOR:
1104 /* monitor can't bridge anyway */
1105 break;
1106 case NL80211_IFTYPE_UNSPECIFIED:
1107 case NUM_NL80211_IFTYPES:
1108 /* not happening */
1109 break;
1110 case NL80211_IFTYPE_P2P_DEVICE:
1111 case NL80211_IFTYPE_WDS:
1112 case NL80211_IFTYPE_NAN:
1113 WARN_ON(1);
1114 break;
1115 }
1116 }
1117
1118 if (!err && ntype != otype && netif_running(dev)) {
1119 cfg80211_update_iface_num(rdev, ntype, 1);
1120 cfg80211_update_iface_num(rdev, otype, -1);
1121 }
1122
1123 return err;
1124}
1125
1126static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1127{
1128 int modulation, streams, bitrate;
1129
1130 /* the formula below does only work for MCS values smaller than 32 */
1131 if (WARN_ON_ONCE(rate->mcs >= 32))
1132 return 0;
1133
1134 modulation = rate->mcs & 7;
1135 streams = (rate->mcs >> 3) + 1;
1136
1137 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1138
1139 if (modulation < 4)
1140 bitrate *= (modulation + 1);
1141 else if (modulation == 4)
1142 bitrate *= (modulation + 2);
1143 else
1144 bitrate *= (modulation + 3);
1145
1146 bitrate *= streams;
1147
1148 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1149 bitrate = (bitrate / 9) * 10;
1150
1151 /* do NOT round down here */
1152 return (bitrate + 50000) / 100000;
1153}
1154
1155static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1156{
1157 static const u32 __mcs2bitrate[] = {
1158 /* control PHY */
1159 [0] = 275,
1160 /* SC PHY */
1161 [1] = 3850,
1162 [2] = 7700,
1163 [3] = 9625,
1164 [4] = 11550,
1165 [5] = 12512, /* 1251.25 mbps */
1166 [6] = 15400,
1167 [7] = 19250,
1168 [8] = 23100,
1169 [9] = 25025,
1170 [10] = 30800,
1171 [11] = 38500,
1172 [12] = 46200,
1173 /* OFDM PHY */
1174 [13] = 6930,
1175 [14] = 8662, /* 866.25 mbps */
1176 [15] = 13860,
1177 [16] = 17325,
1178 [17] = 20790,
1179 [18] = 27720,
1180 [19] = 34650,
1181 [20] = 41580,
1182 [21] = 45045,
1183 [22] = 51975,
1184 [23] = 62370,
1185 [24] = 67568, /* 6756.75 mbps */
1186 /* LP-SC PHY */
1187 [25] = 6260,
1188 [26] = 8340,
1189 [27] = 11120,
1190 [28] = 12510,
1191 [29] = 16680,
1192 [30] = 22240,
1193 [31] = 25030,
1194 };
1195
1196 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1197 return 0;
1198
1199 return __mcs2bitrate[rate->mcs];
1200}
1201
1202static u32 cfg80211_calculate_bitrate_extended_sc_dmg(struct rate_info *rate)
1203{
1204 static const u32 __mcs2bitrate[] = {
1205 [6 - 6] = 26950, /* MCS 9.1 : 2695.0 mbps */
1206 [7 - 6] = 50050, /* MCS 12.1 */
1207 [8 - 6] = 53900,
1208 [9 - 6] = 57750,
1209 [10 - 6] = 63900,
1210 [11 - 6] = 75075,
1211 [12 - 6] = 80850,
1212 };
1213
1214 /* Extended SC MCS not defined for base MCS below 6 or above 12 */
1215 if (WARN_ON_ONCE(rate->mcs < 6 || rate->mcs > 12))
1216 return 0;
1217
1218 return __mcs2bitrate[rate->mcs - 6];
1219}
1220
1221static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1222{
1223 static const u32 __mcs2bitrate[] = {
1224 /* control PHY */
1225 [0] = 275,
1226 /* SC PHY */
1227 [1] = 3850,
1228 [2] = 7700,
1229 [3] = 9625,
1230 [4] = 11550,
1231 [5] = 12512, /* 1251.25 mbps */
1232 [6] = 13475,
1233 [7] = 15400,
1234 [8] = 19250,
1235 [9] = 23100,
1236 [10] = 25025,
1237 [11] = 26950,
1238 [12] = 30800,
1239 [13] = 38500,
1240 [14] = 46200,
1241 [15] = 50050,
1242 [16] = 53900,
1243 [17] = 57750,
1244 [18] = 69300,
1245 [19] = 75075,
1246 [20] = 80850,
1247 };
1248
1249 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1250 return 0;
1251
1252 return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1253}
1254
1255static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1256{
1257 static const u32 base[4][12] = {
1258 { 6500000,
1259 13000000,
1260 19500000,
1261 26000000,
1262 39000000,
1263 52000000,
1264 58500000,
1265 65000000,
1266 78000000,
1267 /* not in the spec, but some devices use this: */
1268 86700000,
1269 97500000,
1270 108300000,
1271 },
1272 { 13500000,
1273 27000000,
1274 40500000,
1275 54000000,
1276 81000000,
1277 108000000,
1278 121500000,
1279 135000000,
1280 162000000,
1281 180000000,
1282 202500000,
1283 225000000,
1284 },
1285 { 29300000,
1286 58500000,
1287 87800000,
1288 117000000,
1289 175500000,
1290 234000000,
1291 263300000,
1292 292500000,
1293 351000000,
1294 390000000,
1295 438800000,
1296 487500000,
1297 },
1298 { 58500000,
1299 117000000,
1300 175500000,
1301 234000000,
1302 351000000,
1303 468000000,
1304 526500000,
1305 585000000,
1306 702000000,
1307 780000000,
1308 877500000,
1309 975000000,
1310 },
1311 };
1312 u32 bitrate;
1313 int idx;
1314
1315 if (rate->mcs > 11)
1316 goto warn;
1317
1318 switch (rate->bw) {
1319 case RATE_INFO_BW_160:
1320 idx = 3;
1321 break;
1322 case RATE_INFO_BW_80:
1323 idx = 2;
1324 break;
1325 case RATE_INFO_BW_40:
1326 idx = 1;
1327 break;
1328 case RATE_INFO_BW_5:
1329 case RATE_INFO_BW_10:
1330 default:
1331 goto warn;
1332 case RATE_INFO_BW_20:
1333 idx = 0;
1334 }
1335
1336 bitrate = base[idx][rate->mcs];
1337 bitrate *= rate->nss;
1338
1339 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1340 bitrate = (bitrate / 9) * 10;
1341
1342 /* do NOT round down here */
1343 return (bitrate + 50000) / 100000;
1344 warn:
1345 WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1346 rate->bw, rate->mcs, rate->nss);
1347 return 0;
1348}
1349
1350static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1351{
1352#define SCALE 6144
1353 u32 mcs_divisors[14] = {
1354 102399, /* 16.666666... */
1355 51201, /* 8.333333... */
1356 34134, /* 5.555555... */
1357 25599, /* 4.166666... */
1358 17067, /* 2.777777... */
1359 12801, /* 2.083333... */
1360 11769, /* 1.851851... */
1361 10239, /* 1.666666... */
1362 8532, /* 1.388888... */
1363 7680, /* 1.250000... */
1364 6828, /* 1.111111... */
1365 6144, /* 1.000000... */
1366 5690, /* 0.926106... */
1367 5120, /* 0.833333... */
1368 };
1369 u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1370 u32 rates_969[3] = { 480388888, 453700000, 408333333 };
1371 u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1372 u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1373 u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1374 u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1375 u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1376 u64 tmp;
1377 u32 result;
1378
1379 if (WARN_ON_ONCE(rate->mcs > 13))
1380 return 0;
1381
1382 if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1383 return 0;
1384 if (WARN_ON_ONCE(rate->he_ru_alloc >
1385 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1386 return 0;
1387 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1388 return 0;
1389
1390 if (rate->bw == RATE_INFO_BW_160)
1391 result = rates_160M[rate->he_gi];
1392 else if (rate->bw == RATE_INFO_BW_80 ||
1393 (rate->bw == RATE_INFO_BW_HE_RU &&
1394 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1395 result = rates_969[rate->he_gi];
1396 else if (rate->bw == RATE_INFO_BW_40 ||
1397 (rate->bw == RATE_INFO_BW_HE_RU &&
1398 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1399 result = rates_484[rate->he_gi];
1400 else if (rate->bw == RATE_INFO_BW_20 ||
1401 (rate->bw == RATE_INFO_BW_HE_RU &&
1402 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1403 result = rates_242[rate->he_gi];
1404 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1405 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1406 result = rates_106[rate->he_gi];
1407 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1408 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1409 result = rates_52[rate->he_gi];
1410 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1411 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1412 result = rates_26[rate->he_gi];
1413 else {
1414 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1415 rate->bw, rate->he_ru_alloc);
1416 return 0;
1417 }
1418
1419 /* now scale to the appropriate MCS */
1420 tmp = result;
1421 tmp *= SCALE;
1422 do_div(tmp, mcs_divisors[rate->mcs]);
1423 result = tmp;
1424
1425 /* and take NSS, DCM into account */
1426 result = (result * rate->nss) / 8;
1427 if (rate->he_dcm)
1428 result /= 2;
1429
1430 return result / 10000;
1431}
1432
1433static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
1434{
1435#define SCALE 6144
1436 static const u32 mcs_divisors[16] = {
1437 102399, /* 16.666666... */
1438 51201, /* 8.333333... */
1439 34134, /* 5.555555... */
1440 25599, /* 4.166666... */
1441 17067, /* 2.777777... */
1442 12801, /* 2.083333... */
1443 11769, /* 1.851851... */
1444 10239, /* 1.666666... */
1445 8532, /* 1.388888... */
1446 7680, /* 1.250000... */
1447 6828, /* 1.111111... */
1448 6144, /* 1.000000... */
1449 5690, /* 0.926106... */
1450 5120, /* 0.833333... */
1451 409600, /* 66.666666... */
1452 204800, /* 33.333333... */
1453 };
1454 static const u32 rates_996[3] = { 480388888, 453700000, 408333333 };
1455 static const u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1456 static const u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1457 static const u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1458 static const u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1459 static const u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1460 u64 tmp;
1461 u32 result;
1462
1463 if (WARN_ON_ONCE(rate->mcs > 15))
1464 return 0;
1465 if (WARN_ON_ONCE(rate->eht_gi > NL80211_RATE_INFO_EHT_GI_3_2))
1466 return 0;
1467 if (WARN_ON_ONCE(rate->eht_ru_alloc >
1468 NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1469 return 0;
1470 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1471 return 0;
1472
1473 /* Bandwidth checks for MCS 14 */
1474 if (rate->mcs == 14) {
1475 if ((rate->bw != RATE_INFO_BW_EHT_RU &&
1476 rate->bw != RATE_INFO_BW_80 &&
1477 rate->bw != RATE_INFO_BW_160 &&
1478 rate->bw != RATE_INFO_BW_320) ||
1479 (rate->bw == RATE_INFO_BW_EHT_RU &&
1480 rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_996 &&
1481 rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_2x996 &&
1482 rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_4x996)) {
1483 WARN(1, "invalid EHT BW for MCS 14: bw:%d, ru:%d\n",
1484 rate->bw, rate->eht_ru_alloc);
1485 return 0;
1486 }
1487 }
1488
1489 if (rate->bw == RATE_INFO_BW_320 ||
1490 (rate->bw == RATE_INFO_BW_EHT_RU &&
1491 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1492 result = 4 * rates_996[rate->eht_gi];
1493 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1494 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996P484)
1495 result = 3 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1496 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1497 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996)
1498 result = 3 * rates_996[rate->eht_gi];
1499 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1500 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996P484)
1501 result = 2 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1502 else if (rate->bw == RATE_INFO_BW_160 ||
1503 (rate->bw == RATE_INFO_BW_EHT_RU &&
1504 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996))
1505 result = 2 * rates_996[rate->eht_gi];
1506 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1507 rate->eht_ru_alloc ==
1508 NL80211_RATE_INFO_EHT_RU_ALLOC_996P484P242)
1509 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi]
1510 + rates_242[rate->eht_gi];
1511 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1512 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996P484)
1513 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1514 else if (rate->bw == RATE_INFO_BW_80 ||
1515 (rate->bw == RATE_INFO_BW_EHT_RU &&
1516 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996))
1517 result = rates_996[rate->eht_gi];
1518 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1519 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484P242)
1520 result = rates_484[rate->eht_gi] + rates_242[rate->eht_gi];
1521 else if (rate->bw == RATE_INFO_BW_40 ||
1522 (rate->bw == RATE_INFO_BW_EHT_RU &&
1523 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484))
1524 result = rates_484[rate->eht_gi];
1525 else if (rate->bw == RATE_INFO_BW_20 ||
1526 (rate->bw == RATE_INFO_BW_EHT_RU &&
1527 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_242))
1528 result = rates_242[rate->eht_gi];
1529 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1530 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106P26)
1531 result = rates_106[rate->eht_gi] + rates_26[rate->eht_gi];
1532 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1533 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106)
1534 result = rates_106[rate->eht_gi];
1535 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1536 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52P26)
1537 result = rates_52[rate->eht_gi] + rates_26[rate->eht_gi];
1538 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1539 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52)
1540 result = rates_52[rate->eht_gi];
1541 else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1542 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_26)
1543 result = rates_26[rate->eht_gi];
1544 else {
1545 WARN(1, "invalid EHT MCS: bw:%d, ru:%d\n",
1546 rate->bw, rate->eht_ru_alloc);
1547 return 0;
1548 }
1549
1550 /* now scale to the appropriate MCS */
1551 tmp = result;
1552 tmp *= SCALE;
1553 do_div(tmp, mcs_divisors[rate->mcs]);
1554 result = tmp;
1555
1556 /* and take NSS */
1557 result = (result * rate->nss) / 8;
1558
1559 return result / 10000;
1560}
1561
1562u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1563{
1564 if (rate->flags & RATE_INFO_FLAGS_MCS)
1565 return cfg80211_calculate_bitrate_ht(rate);
1566 if (rate->flags & RATE_INFO_FLAGS_DMG)
1567 return cfg80211_calculate_bitrate_dmg(rate);
1568 if (rate->flags & RATE_INFO_FLAGS_EXTENDED_SC_DMG)
1569 return cfg80211_calculate_bitrate_extended_sc_dmg(rate);
1570 if (rate->flags & RATE_INFO_FLAGS_EDMG)
1571 return cfg80211_calculate_bitrate_edmg(rate);
1572 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1573 return cfg80211_calculate_bitrate_vht(rate);
1574 if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1575 return cfg80211_calculate_bitrate_he(rate);
1576 if (rate->flags & RATE_INFO_FLAGS_EHT_MCS)
1577 return cfg80211_calculate_bitrate_eht(rate);
1578
1579 return rate->legacy;
1580}
1581EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1582
1583int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1584 enum ieee80211_p2p_attr_id attr,
1585 u8 *buf, unsigned int bufsize)
1586{
1587 u8 *out = buf;
1588 u16 attr_remaining = 0;
1589 bool desired_attr = false;
1590 u16 desired_len = 0;
1591
1592 while (len > 0) {
1593 unsigned int iedatalen;
1594 unsigned int copy;
1595 const u8 *iedata;
1596
1597 if (len < 2)
1598 return -EILSEQ;
1599 iedatalen = ies[1];
1600 if (iedatalen + 2 > len)
1601 return -EILSEQ;
1602
1603 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1604 goto cont;
1605
1606 if (iedatalen < 4)
1607 goto cont;
1608
1609 iedata = ies + 2;
1610
1611 /* check WFA OUI, P2P subtype */
1612 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1613 iedata[2] != 0x9a || iedata[3] != 0x09)
1614 goto cont;
1615
1616 iedatalen -= 4;
1617 iedata += 4;
1618
1619 /* check attribute continuation into this IE */
1620 copy = min_t(unsigned int, attr_remaining, iedatalen);
1621 if (copy && desired_attr) {
1622 desired_len += copy;
1623 if (out) {
1624 memcpy(out, iedata, min(bufsize, copy));
1625 out += min(bufsize, copy);
1626 bufsize -= min(bufsize, copy);
1627 }
1628
1629
1630 if (copy == attr_remaining)
1631 return desired_len;
1632 }
1633
1634 attr_remaining -= copy;
1635 if (attr_remaining)
1636 goto cont;
1637
1638 iedatalen -= copy;
1639 iedata += copy;
1640
1641 while (iedatalen > 0) {
1642 u16 attr_len;
1643
1644 /* P2P attribute ID & size must fit */
1645 if (iedatalen < 3)
1646 return -EILSEQ;
1647 desired_attr = iedata[0] == attr;
1648 attr_len = get_unaligned_le16(iedata + 1);
1649 iedatalen -= 3;
1650 iedata += 3;
1651
1652 copy = min_t(unsigned int, attr_len, iedatalen);
1653
1654 if (desired_attr) {
1655 desired_len += copy;
1656 if (out) {
1657 memcpy(out, iedata, min(bufsize, copy));
1658 out += min(bufsize, copy);
1659 bufsize -= min(bufsize, copy);
1660 }
1661
1662 if (copy == attr_len)
1663 return desired_len;
1664 }
1665
1666 iedata += copy;
1667 iedatalen -= copy;
1668 attr_remaining = attr_len - copy;
1669 }
1670
1671 cont:
1672 len -= ies[1] + 2;
1673 ies += ies[1] + 2;
1674 }
1675
1676 if (attr_remaining && desired_attr)
1677 return -EILSEQ;
1678
1679 return -ENOENT;
1680}
1681EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1682
1683static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1684{
1685 int i;
1686
1687 /* Make sure array values are legal */
1688 if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1689 return false;
1690
1691 i = 0;
1692 while (i < n_ids) {
1693 if (ids[i] == WLAN_EID_EXTENSION) {
1694 if (id_ext && (ids[i + 1] == id))
1695 return true;
1696
1697 i += 2;
1698 continue;
1699 }
1700
1701 if (ids[i] == id && !id_ext)
1702 return true;
1703
1704 i++;
1705 }
1706 return false;
1707}
1708
1709static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1710{
1711 /* we assume a validly formed IEs buffer */
1712 u8 len = ies[pos + 1];
1713
1714 pos += 2 + len;
1715
1716 /* the IE itself must have 255 bytes for fragments to follow */
1717 if (len < 255)
1718 return pos;
1719
1720 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1721 len = ies[pos + 1];
1722 pos += 2 + len;
1723 }
1724
1725 return pos;
1726}
1727
1728size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1729 const u8 *ids, int n_ids,
1730 const u8 *after_ric, int n_after_ric,
1731 size_t offset)
1732{
1733 size_t pos = offset;
1734
1735 while (pos < ielen) {
1736 u8 ext = 0;
1737
1738 if (ies[pos] == WLAN_EID_EXTENSION)
1739 ext = 2;
1740 if ((pos + ext) >= ielen)
1741 break;
1742
1743 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1744 ies[pos] == WLAN_EID_EXTENSION))
1745 break;
1746
1747 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1748 pos = skip_ie(ies, ielen, pos);
1749
1750 while (pos < ielen) {
1751 if (ies[pos] == WLAN_EID_EXTENSION)
1752 ext = 2;
1753 else
1754 ext = 0;
1755
1756 if ((pos + ext) >= ielen)
1757 break;
1758
1759 if (!ieee80211_id_in_list(after_ric,
1760 n_after_ric,
1761 ies[pos + ext],
1762 ext == 2))
1763 pos = skip_ie(ies, ielen, pos);
1764 else
1765 break;
1766 }
1767 } else {
1768 pos = skip_ie(ies, ielen, pos);
1769 }
1770 }
1771
1772 return pos;
1773}
1774EXPORT_SYMBOL(ieee80211_ie_split_ric);
1775
1776bool ieee80211_operating_class_to_band(u8 operating_class,
1777 enum nl80211_band *band)
1778{
1779 switch (operating_class) {
1780 case 112:
1781 case 115 ... 127:
1782 case 128 ... 130:
1783 *band = NL80211_BAND_5GHZ;
1784 return true;
1785 case 131 ... 135:
1786 *band = NL80211_BAND_6GHZ;
1787 return true;
1788 case 81:
1789 case 82:
1790 case 83:
1791 case 84:
1792 *band = NL80211_BAND_2GHZ;
1793 return true;
1794 case 180:
1795 *band = NL80211_BAND_60GHZ;
1796 return true;
1797 }
1798
1799 return false;
1800}
1801EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1802
1803bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1804 u8 *op_class)
1805{
1806 u8 vht_opclass;
1807 u32 freq = chandef->center_freq1;
1808
1809 if (freq >= 2412 && freq <= 2472) {
1810 if (chandef->width > NL80211_CHAN_WIDTH_40)
1811 return false;
1812
1813 /* 2.407 GHz, channels 1..13 */
1814 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1815 if (freq > chandef->chan->center_freq)
1816 *op_class = 83; /* HT40+ */
1817 else
1818 *op_class = 84; /* HT40- */
1819 } else {
1820 *op_class = 81;
1821 }
1822
1823 return true;
1824 }
1825
1826 if (freq == 2484) {
1827 /* channel 14 is only for IEEE 802.11b */
1828 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1829 return false;
1830
1831 *op_class = 82; /* channel 14 */
1832 return true;
1833 }
1834
1835 switch (chandef->width) {
1836 case NL80211_CHAN_WIDTH_80:
1837 vht_opclass = 128;
1838 break;
1839 case NL80211_CHAN_WIDTH_160:
1840 vht_opclass = 129;
1841 break;
1842 case NL80211_CHAN_WIDTH_80P80:
1843 vht_opclass = 130;
1844 break;
1845 case NL80211_CHAN_WIDTH_10:
1846 case NL80211_CHAN_WIDTH_5:
1847 return false; /* unsupported for now */
1848 default:
1849 vht_opclass = 0;
1850 break;
1851 }
1852
1853 /* 5 GHz, channels 36..48 */
1854 if (freq >= 5180 && freq <= 5240) {
1855 if (vht_opclass) {
1856 *op_class = vht_opclass;
1857 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1858 if (freq > chandef->chan->center_freq)
1859 *op_class = 116;
1860 else
1861 *op_class = 117;
1862 } else {
1863 *op_class = 115;
1864 }
1865
1866 return true;
1867 }
1868
1869 /* 5 GHz, channels 52..64 */
1870 if (freq >= 5260 && freq <= 5320) {
1871 if (vht_opclass) {
1872 *op_class = vht_opclass;
1873 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1874 if (freq > chandef->chan->center_freq)
1875 *op_class = 119;
1876 else
1877 *op_class = 120;
1878 } else {
1879 *op_class = 118;
1880 }
1881
1882 return true;
1883 }
1884
1885 /* 5 GHz, channels 100..144 */
1886 if (freq >= 5500 && freq <= 5720) {
1887 if (vht_opclass) {
1888 *op_class = vht_opclass;
1889 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1890 if (freq > chandef->chan->center_freq)
1891 *op_class = 122;
1892 else
1893 *op_class = 123;
1894 } else {
1895 *op_class = 121;
1896 }
1897
1898 return true;
1899 }
1900
1901 /* 5 GHz, channels 149..169 */
1902 if (freq >= 5745 && freq <= 5845) {
1903 if (vht_opclass) {
1904 *op_class = vht_opclass;
1905 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1906 if (freq > chandef->chan->center_freq)
1907 *op_class = 126;
1908 else
1909 *op_class = 127;
1910 } else if (freq <= 5805) {
1911 *op_class = 124;
1912 } else {
1913 *op_class = 125;
1914 }
1915
1916 return true;
1917 }
1918
1919 /* 56.16 GHz, channel 1..4 */
1920 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1921 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1922 return false;
1923
1924 *op_class = 180;
1925 return true;
1926 }
1927
1928 /* not supported yet */
1929 return false;
1930}
1931EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1932
1933static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1934 u32 *beacon_int_gcd,
1935 bool *beacon_int_different)
1936{
1937 struct wireless_dev *wdev;
1938
1939 *beacon_int_gcd = 0;
1940 *beacon_int_different = false;
1941
1942 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1943 if (!wdev->beacon_interval)
1944 continue;
1945
1946 if (!*beacon_int_gcd) {
1947 *beacon_int_gcd = wdev->beacon_interval;
1948 continue;
1949 }
1950
1951 if (wdev->beacon_interval == *beacon_int_gcd)
1952 continue;
1953
1954 *beacon_int_different = true;
1955 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1956 }
1957
1958 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1959 if (*beacon_int_gcd)
1960 *beacon_int_different = true;
1961 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1962 }
1963}
1964
1965int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1966 enum nl80211_iftype iftype, u32 beacon_int)
1967{
1968 /*
1969 * This is just a basic pre-condition check; if interface combinations
1970 * are possible the driver must already be checking those with a call
1971 * to cfg80211_check_combinations(), in which case we'll validate more
1972 * through the cfg80211_calculate_bi_data() call and code in
1973 * cfg80211_iter_combinations().
1974 */
1975
1976 if (beacon_int < 10 || beacon_int > 10000)
1977 return -EINVAL;
1978
1979 return 0;
1980}
1981
1982int cfg80211_iter_combinations(struct wiphy *wiphy,
1983 struct iface_combination_params *params,
1984 void (*iter)(const struct ieee80211_iface_combination *c,
1985 void *data),
1986 void *data)
1987{
1988 const struct ieee80211_regdomain *regdom;
1989 enum nl80211_dfs_regions region = 0;
1990 int i, j, iftype;
1991 int num_interfaces = 0;
1992 u32 used_iftypes = 0;
1993 u32 beacon_int_gcd;
1994 bool beacon_int_different;
1995
1996 /*
1997 * This is a bit strange, since the iteration used to rely only on
1998 * the data given by the driver, but here it now relies on context,
1999 * in form of the currently operating interfaces.
2000 * This is OK for all current users, and saves us from having to
2001 * push the GCD calculations into all the drivers.
2002 * In the future, this should probably rely more on data that's in
2003 * cfg80211 already - the only thing not would appear to be any new
2004 * interfaces (while being brought up) and channel/radar data.
2005 */
2006 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
2007 &beacon_int_gcd, &beacon_int_different);
2008
2009 if (params->radar_detect) {
2010 rcu_read_lock();
2011 regdom = rcu_dereference(cfg80211_regdomain);
2012 if (regdom)
2013 region = regdom->dfs_region;
2014 rcu_read_unlock();
2015 }
2016
2017 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2018 num_interfaces += params->iftype_num[iftype];
2019 if (params->iftype_num[iftype] > 0 &&
2020 !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2021 used_iftypes |= BIT(iftype);
2022 }
2023
2024 for (i = 0; i < wiphy->n_iface_combinations; i++) {
2025 const struct ieee80211_iface_combination *c;
2026 struct ieee80211_iface_limit *limits;
2027 u32 all_iftypes = 0;
2028
2029 c = &wiphy->iface_combinations[i];
2030
2031 if (num_interfaces > c->max_interfaces)
2032 continue;
2033 if (params->num_different_channels > c->num_different_channels)
2034 continue;
2035
2036 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
2037 GFP_KERNEL);
2038 if (!limits)
2039 return -ENOMEM;
2040
2041 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2042 if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2043 continue;
2044 for (j = 0; j < c->n_limits; j++) {
2045 all_iftypes |= limits[j].types;
2046 if (!(limits[j].types & BIT(iftype)))
2047 continue;
2048 if (limits[j].max < params->iftype_num[iftype])
2049 goto cont;
2050 limits[j].max -= params->iftype_num[iftype];
2051 }
2052 }
2053
2054 if (params->radar_detect !=
2055 (c->radar_detect_widths & params->radar_detect))
2056 goto cont;
2057
2058 if (params->radar_detect && c->radar_detect_regions &&
2059 !(c->radar_detect_regions & BIT(region)))
2060 goto cont;
2061
2062 /* Finally check that all iftypes that we're currently
2063 * using are actually part of this combination. If they
2064 * aren't then we can't use this combination and have
2065 * to continue to the next.
2066 */
2067 if ((all_iftypes & used_iftypes) != used_iftypes)
2068 goto cont;
2069
2070 if (beacon_int_gcd) {
2071 if (c->beacon_int_min_gcd &&
2072 beacon_int_gcd < c->beacon_int_min_gcd)
2073 goto cont;
2074 if (!c->beacon_int_min_gcd && beacon_int_different)
2075 goto cont;
2076 }
2077
2078 /* This combination covered all interface types and
2079 * supported the requested numbers, so we're good.
2080 */
2081
2082 (*iter)(c, data);
2083 cont:
2084 kfree(limits);
2085 }
2086
2087 return 0;
2088}
2089EXPORT_SYMBOL(cfg80211_iter_combinations);
2090
2091static void
2092cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
2093 void *data)
2094{
2095 int *num = data;
2096 (*num)++;
2097}
2098
2099int cfg80211_check_combinations(struct wiphy *wiphy,
2100 struct iface_combination_params *params)
2101{
2102 int err, num = 0;
2103
2104 err = cfg80211_iter_combinations(wiphy, params,
2105 cfg80211_iter_sum_ifcombs, &num);
2106 if (err)
2107 return err;
2108 if (num == 0)
2109 return -EBUSY;
2110
2111 return 0;
2112}
2113EXPORT_SYMBOL(cfg80211_check_combinations);
2114
2115int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
2116 const u8 *rates, unsigned int n_rates,
2117 u32 *mask)
2118{
2119 int i, j;
2120
2121 if (!sband)
2122 return -EINVAL;
2123
2124 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
2125 return -EINVAL;
2126
2127 *mask = 0;
2128
2129 for (i = 0; i < n_rates; i++) {
2130 int rate = (rates[i] & 0x7f) * 5;
2131 bool found = false;
2132
2133 for (j = 0; j < sband->n_bitrates; j++) {
2134 if (sband->bitrates[j].bitrate == rate) {
2135 found = true;
2136 *mask |= BIT(j);
2137 break;
2138 }
2139 }
2140 if (!found)
2141 return -EINVAL;
2142 }
2143
2144 /*
2145 * mask must have at least one bit set here since we
2146 * didn't accept a 0-length rates array nor allowed
2147 * entries in the array that didn't exist
2148 */
2149
2150 return 0;
2151}
2152
2153unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
2154{
2155 enum nl80211_band band;
2156 unsigned int n_channels = 0;
2157
2158 for (band = 0; band < NUM_NL80211_BANDS; band++)
2159 if (wiphy->bands[band])
2160 n_channels += wiphy->bands[band]->n_channels;
2161
2162 return n_channels;
2163}
2164EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
2165
2166int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
2167 struct station_info *sinfo)
2168{
2169 struct cfg80211_registered_device *rdev;
2170 struct wireless_dev *wdev;
2171
2172 wdev = dev->ieee80211_ptr;
2173 if (!wdev)
2174 return -EOPNOTSUPP;
2175
2176 rdev = wiphy_to_rdev(wdev->wiphy);
2177 if (!rdev->ops->get_station)
2178 return -EOPNOTSUPP;
2179
2180 memset(sinfo, 0, sizeof(*sinfo));
2181
2182 return rdev_get_station(rdev, dev, mac_addr, sinfo);
2183}
2184EXPORT_SYMBOL(cfg80211_get_station);
2185
2186void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
2187{
2188 int i;
2189
2190 if (!f)
2191 return;
2192
2193 kfree(f->serv_spec_info);
2194 kfree(f->srf_bf);
2195 kfree(f->srf_macs);
2196 for (i = 0; i < f->num_rx_filters; i++)
2197 kfree(f->rx_filters[i].filter);
2198
2199 for (i = 0; i < f->num_tx_filters; i++)
2200 kfree(f->tx_filters[i].filter);
2201
2202 kfree(f->rx_filters);
2203 kfree(f->tx_filters);
2204 kfree(f);
2205}
2206EXPORT_SYMBOL(cfg80211_free_nan_func);
2207
2208bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
2209 u32 center_freq_khz, u32 bw_khz)
2210{
2211 u32 start_freq_khz, end_freq_khz;
2212
2213 start_freq_khz = center_freq_khz - (bw_khz / 2);
2214 end_freq_khz = center_freq_khz + (bw_khz / 2);
2215
2216 if (start_freq_khz >= freq_range->start_freq_khz &&
2217 end_freq_khz <= freq_range->end_freq_khz)
2218 return true;
2219
2220 return false;
2221}
2222
2223int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
2224{
2225 sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
2226 sizeof(*(sinfo->pertid)),
2227 gfp);
2228 if (!sinfo->pertid)
2229 return -ENOMEM;
2230
2231 return 0;
2232}
2233EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
2234
2235/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
2236/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
2237const unsigned char rfc1042_header[] __aligned(2) =
2238 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
2239EXPORT_SYMBOL(rfc1042_header);
2240
2241/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2242const unsigned char bridge_tunnel_header[] __aligned(2) =
2243 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2244EXPORT_SYMBOL(bridge_tunnel_header);
2245
2246/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2247struct iapp_layer2_update {
2248 u8 da[ETH_ALEN]; /* broadcast */
2249 u8 sa[ETH_ALEN]; /* STA addr */
2250 __be16 len; /* 6 */
2251 u8 dsap; /* 0 */
2252 u8 ssap; /* 0 */
2253 u8 control;
2254 u8 xid_info[3];
2255} __packed;
2256
2257void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2258{
2259 struct iapp_layer2_update *msg;
2260 struct sk_buff *skb;
2261
2262 /* Send Level 2 Update Frame to update forwarding tables in layer 2
2263 * bridge devices */
2264
2265 skb = dev_alloc_skb(sizeof(*msg));
2266 if (!skb)
2267 return;
2268 msg = skb_put(skb, sizeof(*msg));
2269
2270 /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2271 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2272
2273 eth_broadcast_addr(msg->da);
2274 ether_addr_copy(msg->sa, addr);
2275 msg->len = htons(6);
2276 msg->dsap = 0;
2277 msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */
2278 msg->control = 0xaf; /* XID response lsb.1111F101.
2279 * F=0 (no poll command; unsolicited frame) */
2280 msg->xid_info[0] = 0x81; /* XID format identifier */
2281 msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
2282 msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */
2283
2284 skb->dev = dev;
2285 skb->protocol = eth_type_trans(skb, dev);
2286 memset(skb->cb, 0, sizeof(skb->cb));
2287 netif_rx(skb);
2288}
2289EXPORT_SYMBOL(cfg80211_send_layer2_update);
2290
2291int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2292 enum ieee80211_vht_chanwidth bw,
2293 int mcs, bool ext_nss_bw_capable,
2294 unsigned int max_vht_nss)
2295{
2296 u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2297 int ext_nss_bw;
2298 int supp_width;
2299 int i, mcs_encoding;
2300
2301 if (map == 0xffff)
2302 return 0;
2303
2304 if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2305 return 0;
2306 if (mcs <= 7)
2307 mcs_encoding = 0;
2308 else if (mcs == 8)
2309 mcs_encoding = 1;
2310 else
2311 mcs_encoding = 2;
2312
2313 if (!max_vht_nss) {
2314 /* find max_vht_nss for the given MCS */
2315 for (i = 7; i >= 0; i--) {
2316 int supp = (map >> (2 * i)) & 3;
2317
2318 if (supp == 3)
2319 continue;
2320
2321 if (supp >= mcs_encoding) {
2322 max_vht_nss = i + 1;
2323 break;
2324 }
2325 }
2326 }
2327
2328 if (!(cap->supp_mcs.tx_mcs_map &
2329 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2330 return max_vht_nss;
2331
2332 ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2333 IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2334 supp_width = le32_get_bits(cap->vht_cap_info,
2335 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2336
2337 /* if not capable, treat ext_nss_bw as 0 */
2338 if (!ext_nss_bw_capable)
2339 ext_nss_bw = 0;
2340
2341 /* This is invalid */
2342 if (supp_width == 3)
2343 return 0;
2344
2345 /* This is an invalid combination so pretend nothing is supported */
2346 if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2347 return 0;
2348
2349 /*
2350 * Cover all the special cases according to IEEE 802.11-2016
2351 * Table 9-250. All other cases are either factor of 1 or not
2352 * valid/supported.
2353 */
2354 switch (bw) {
2355 case IEEE80211_VHT_CHANWIDTH_USE_HT:
2356 case IEEE80211_VHT_CHANWIDTH_80MHZ:
2357 if ((supp_width == 1 || supp_width == 2) &&
2358 ext_nss_bw == 3)
2359 return 2 * max_vht_nss;
2360 break;
2361 case IEEE80211_VHT_CHANWIDTH_160MHZ:
2362 if (supp_width == 0 &&
2363 (ext_nss_bw == 1 || ext_nss_bw == 2))
2364 return max_vht_nss / 2;
2365 if (supp_width == 0 &&
2366 ext_nss_bw == 3)
2367 return (3 * max_vht_nss) / 4;
2368 if (supp_width == 1 &&
2369 ext_nss_bw == 3)
2370 return 2 * max_vht_nss;
2371 break;
2372 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2373 if (supp_width == 0 && ext_nss_bw == 1)
2374 return 0; /* not possible */
2375 if (supp_width == 0 &&
2376 ext_nss_bw == 2)
2377 return max_vht_nss / 2;
2378 if (supp_width == 0 &&
2379 ext_nss_bw == 3)
2380 return (3 * max_vht_nss) / 4;
2381 if (supp_width == 1 &&
2382 ext_nss_bw == 0)
2383 return 0; /* not possible */
2384 if (supp_width == 1 &&
2385 ext_nss_bw == 1)
2386 return max_vht_nss / 2;
2387 if (supp_width == 1 &&
2388 ext_nss_bw == 2)
2389 return (3 * max_vht_nss) / 4;
2390 break;
2391 }
2392
2393 /* not covered or invalid combination received */
2394 return max_vht_nss;
2395}
2396EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2397
2398bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2399 bool is_4addr, u8 check_swif)
2400
2401{
2402 bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2403
2404 switch (check_swif) {
2405 case 0:
2406 if (is_vlan && is_4addr)
2407 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2408 return wiphy->interface_modes & BIT(iftype);
2409 case 1:
2410 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2411 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2412 return wiphy->software_iftypes & BIT(iftype);
2413 default:
2414 break;
2415 }
2416
2417 return false;
2418}
2419EXPORT_SYMBOL(cfg80211_iftype_allowed);