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) 2018-2019 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
27 struct ieee80211_rate *
ieee80211_get_response_rate(struct ieee80211_supported_band * sband,u32 basic_rates,int bitrate)28 ieee80211_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 }
44 EXPORT_SYMBOL(ieee80211_get_response_rate);
45
ieee80211_mandatory_rates(struct ieee80211_supported_band * sband,enum nl80211_bss_scan_width scan_width)46 u32 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 }
73 EXPORT_SYMBOL(ieee80211_mandatory_rates);
74
ieee80211_channel_to_freq_khz(int chan,enum nl80211_band band)75 u32 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 if (chan == 14)
84 return MHZ_TO_KHZ(2484);
85 else if (chan < 14)
86 return MHZ_TO_KHZ(2407 + chan * 5);
87 break;
88 case NL80211_BAND_5GHZ:
89 if (chan >= 182 && chan <= 196)
90 return MHZ_TO_KHZ(4000 + chan * 5);
91 else
92 return MHZ_TO_KHZ(5000 + chan * 5);
93 break;
94 case NL80211_BAND_6GHZ:
95 /* see 802.11ax D6.1 27.3.23.2 */
96 if (chan == 2)
97 return MHZ_TO_KHZ(5935);
98 if (chan <= 233)
99 return MHZ_TO_KHZ(5950 + chan * 5);
100 break;
101 case NL80211_BAND_60GHZ:
102 if (chan < 7)
103 return MHZ_TO_KHZ(56160 + chan * 2160);
104 break;
105 default:
106 ;
107 }
108 return 0; /* not supported */
109 }
110 EXPORT_SYMBOL(ieee80211_channel_to_freq_khz);
111
ieee80211_freq_khz_to_channel(u32 freq)112 int ieee80211_freq_khz_to_channel(u32 freq)
113 {
114 /* TODO: just handle MHz for now */
115 freq = KHZ_TO_MHZ(freq);
116
117 /* see 802.11 17.3.8.3.2 and Annex J */
118 if (freq == 2484)
119 return 14;
120 else if (freq < 2484)
121 return (freq - 2407) / 5;
122 else if (freq >= 4910 && freq <= 4980)
123 return (freq - 4000) / 5;
124 else if (freq < 5925)
125 return (freq - 5000) / 5;
126 else if (freq == 5935)
127 return 2;
128 else if (freq <= 45000) /* DMG band lower limit */
129 /* see 802.11ax D6.1 27.3.22.2 */
130 return (freq - 5950) / 5;
131 else if (freq >= 58320 && freq <= 70200)
132 return (freq - 56160) / 2160;
133 else
134 return 0;
135 }
136 EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
137
ieee80211_get_channel_khz(struct wiphy * wiphy,u32 freq)138 struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
139 u32 freq)
140 {
141 enum nl80211_band band;
142 struct ieee80211_supported_band *sband;
143 int i;
144
145 for (band = 0; band < NUM_NL80211_BANDS; band++) {
146 sband = wiphy->bands[band];
147
148 if (!sband)
149 continue;
150
151 for (i = 0; i < sband->n_channels; i++) {
152 struct ieee80211_channel *chan = &sband->channels[i];
153
154 if (ieee80211_channel_to_khz(chan) == freq)
155 return chan;
156 }
157 }
158
159 return NULL;
160 }
161 EXPORT_SYMBOL(ieee80211_get_channel_khz);
162
set_mandatory_flags_band(struct ieee80211_supported_band * sband)163 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
164 {
165 int i, want;
166
167 switch (sband->band) {
168 case NL80211_BAND_5GHZ:
169 case NL80211_BAND_6GHZ:
170 want = 3;
171 for (i = 0; i < sband->n_bitrates; i++) {
172 if (sband->bitrates[i].bitrate == 60 ||
173 sband->bitrates[i].bitrate == 120 ||
174 sband->bitrates[i].bitrate == 240) {
175 sband->bitrates[i].flags |=
176 IEEE80211_RATE_MANDATORY_A;
177 want--;
178 }
179 }
180 WARN_ON(want);
181 break;
182 case NL80211_BAND_2GHZ:
183 want = 7;
184 for (i = 0; i < sband->n_bitrates; i++) {
185 switch (sband->bitrates[i].bitrate) {
186 case 10:
187 case 20:
188 case 55:
189 case 110:
190 sband->bitrates[i].flags |=
191 IEEE80211_RATE_MANDATORY_B |
192 IEEE80211_RATE_MANDATORY_G;
193 want--;
194 break;
195 case 60:
196 case 120:
197 case 240:
198 sband->bitrates[i].flags |=
199 IEEE80211_RATE_MANDATORY_G;
200 want--;
201 /* fall through */
202 default:
203 sband->bitrates[i].flags |=
204 IEEE80211_RATE_ERP_G;
205 break;
206 }
207 }
208 WARN_ON(want != 0 && want != 3);
209 break;
210 case NL80211_BAND_60GHZ:
211 /* check for mandatory HT MCS 1..4 */
212 WARN_ON(!sband->ht_cap.ht_supported);
213 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
214 break;
215 case NUM_NL80211_BANDS:
216 default:
217 WARN_ON(1);
218 break;
219 }
220 }
221
ieee80211_set_bitrate_flags(struct wiphy * wiphy)222 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
223 {
224 enum nl80211_band band;
225
226 for (band = 0; band < NUM_NL80211_BANDS; band++)
227 if (wiphy->bands[band])
228 set_mandatory_flags_band(wiphy->bands[band]);
229 }
230
cfg80211_supported_cipher_suite(struct wiphy * wiphy,u32 cipher)231 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
232 {
233 int i;
234 for (i = 0; i < wiphy->n_cipher_suites; i++)
235 if (cipher == wiphy->cipher_suites[i])
236 return true;
237 return false;
238 }
239
240 static bool
cfg80211_igtk_cipher_supported(struct cfg80211_registered_device * rdev)241 cfg80211_igtk_cipher_supported(struct cfg80211_registered_device *rdev)
242 {
243 struct wiphy *wiphy = &rdev->wiphy;
244 int i;
245
246 for (i = 0; i < wiphy->n_cipher_suites; i++) {
247 switch (wiphy->cipher_suites[i]) {
248 case WLAN_CIPHER_SUITE_AES_CMAC:
249 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
250 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
251 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
252 return true;
253 }
254 }
255
256 return false;
257 }
258
cfg80211_valid_key_idx(struct cfg80211_registered_device * rdev,int key_idx,bool pairwise)259 bool cfg80211_valid_key_idx(struct cfg80211_registered_device *rdev,
260 int key_idx, bool pairwise)
261 {
262 int max_key_idx;
263
264 if (pairwise)
265 max_key_idx = 3;
266 else if (wiphy_ext_feature_isset(&rdev->wiphy,
267 NL80211_EXT_FEATURE_BEACON_PROTECTION))
268 max_key_idx = 7;
269 else if (cfg80211_igtk_cipher_supported(rdev))
270 max_key_idx = 5;
271 else
272 max_key_idx = 3;
273
274 if (key_idx < 0 || key_idx > max_key_idx)
275 return false;
276
277 return true;
278 }
279
cfg80211_validate_key_settings(struct cfg80211_registered_device * rdev,struct key_params * params,int key_idx,bool pairwise,const u8 * mac_addr)280 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
281 struct key_params *params, int key_idx,
282 bool pairwise, const u8 *mac_addr)
283 {
284 if (!cfg80211_valid_key_idx(rdev, key_idx, pairwise))
285 return -EINVAL;
286
287 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
288 return -EINVAL;
289
290 if (pairwise && !mac_addr)
291 return -EINVAL;
292
293 switch (params->cipher) {
294 case WLAN_CIPHER_SUITE_TKIP:
295 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
296 if ((pairwise && key_idx) ||
297 params->mode != NL80211_KEY_RX_TX)
298 return -EINVAL;
299 break;
300 case WLAN_CIPHER_SUITE_CCMP:
301 case WLAN_CIPHER_SUITE_CCMP_256:
302 case WLAN_CIPHER_SUITE_GCMP:
303 case WLAN_CIPHER_SUITE_GCMP_256:
304 /* IEEE802.11-2016 allows only 0 and - when supporting
305 * Extended Key ID - 1 as index for pairwise keys.
306 * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
307 * the driver supports Extended Key ID.
308 * @NL80211_KEY_SET_TX can't be set when installing and
309 * validating a key.
310 */
311 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
312 params->mode == NL80211_KEY_SET_TX)
313 return -EINVAL;
314 if (wiphy_ext_feature_isset(&rdev->wiphy,
315 NL80211_EXT_FEATURE_EXT_KEY_ID)) {
316 if (pairwise && (key_idx < 0 || key_idx > 1))
317 return -EINVAL;
318 } else if (pairwise && key_idx) {
319 return -EINVAL;
320 }
321 break;
322 case WLAN_CIPHER_SUITE_AES_CMAC:
323 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
324 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
325 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
326 /* Disallow BIP (group-only) cipher as pairwise cipher */
327 if (pairwise)
328 return -EINVAL;
329 if (key_idx < 4)
330 return -EINVAL;
331 break;
332 case WLAN_CIPHER_SUITE_WEP40:
333 case WLAN_CIPHER_SUITE_WEP104:
334 if (key_idx > 3)
335 return -EINVAL;
336 default:
337 break;
338 }
339
340 switch (params->cipher) {
341 case WLAN_CIPHER_SUITE_WEP40:
342 if (params->key_len != WLAN_KEY_LEN_WEP40)
343 return -EINVAL;
344 break;
345 case WLAN_CIPHER_SUITE_TKIP:
346 if (params->key_len != WLAN_KEY_LEN_TKIP)
347 return -EINVAL;
348 break;
349 case WLAN_CIPHER_SUITE_CCMP:
350 if (params->key_len != WLAN_KEY_LEN_CCMP)
351 return -EINVAL;
352 break;
353 case WLAN_CIPHER_SUITE_CCMP_256:
354 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
355 return -EINVAL;
356 break;
357 case WLAN_CIPHER_SUITE_GCMP:
358 if (params->key_len != WLAN_KEY_LEN_GCMP)
359 return -EINVAL;
360 break;
361 case WLAN_CIPHER_SUITE_GCMP_256:
362 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
363 return -EINVAL;
364 break;
365 case WLAN_CIPHER_SUITE_WEP104:
366 if (params->key_len != WLAN_KEY_LEN_WEP104)
367 return -EINVAL;
368 break;
369 case WLAN_CIPHER_SUITE_AES_CMAC:
370 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
371 return -EINVAL;
372 break;
373 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
374 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
375 return -EINVAL;
376 break;
377 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
378 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
379 return -EINVAL;
380 break;
381 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
382 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
383 return -EINVAL;
384 break;
385 default:
386 /*
387 * We don't know anything about this algorithm,
388 * allow using it -- but the driver must check
389 * all parameters! We still check below whether
390 * or not the driver supports this algorithm,
391 * of course.
392 */
393 break;
394 }
395
396 if (params->seq) {
397 switch (params->cipher) {
398 case WLAN_CIPHER_SUITE_WEP40:
399 case WLAN_CIPHER_SUITE_WEP104:
400 /* These ciphers do not use key sequence */
401 return -EINVAL;
402 case WLAN_CIPHER_SUITE_TKIP:
403 case WLAN_CIPHER_SUITE_CCMP:
404 case WLAN_CIPHER_SUITE_CCMP_256:
405 case WLAN_CIPHER_SUITE_GCMP:
406 case WLAN_CIPHER_SUITE_GCMP_256:
407 case WLAN_CIPHER_SUITE_AES_CMAC:
408 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
409 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
410 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
411 if (params->seq_len != 6)
412 return -EINVAL;
413 break;
414 }
415 }
416
417 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
418 return -EINVAL;
419
420 return 0;
421 }
422
ieee80211_hdrlen(__le16 fc)423 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
424 {
425 unsigned int hdrlen = 24;
426
427 if (ieee80211_is_data(fc)) {
428 if (ieee80211_has_a4(fc))
429 hdrlen = 30;
430 if (ieee80211_is_data_qos(fc)) {
431 hdrlen += IEEE80211_QOS_CTL_LEN;
432 if (ieee80211_has_order(fc))
433 hdrlen += IEEE80211_HT_CTL_LEN;
434 }
435 goto out;
436 }
437
438 if (ieee80211_is_mgmt(fc)) {
439 if (ieee80211_has_order(fc))
440 hdrlen += IEEE80211_HT_CTL_LEN;
441 goto out;
442 }
443
444 if (ieee80211_is_ctl(fc)) {
445 /*
446 * ACK and CTS are 10 bytes, all others 16. To see how
447 * to get this condition consider
448 * subtype mask: 0b0000000011110000 (0x00F0)
449 * ACK subtype: 0b0000000011010000 (0x00D0)
450 * CTS subtype: 0b0000000011000000 (0x00C0)
451 * bits that matter: ^^^ (0x00E0)
452 * value of those: 0b0000000011000000 (0x00C0)
453 */
454 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
455 hdrlen = 10;
456 else
457 hdrlen = 16;
458 }
459 out:
460 return hdrlen;
461 }
462 EXPORT_SYMBOL(ieee80211_hdrlen);
463
ieee80211_get_hdrlen_from_skb(const struct sk_buff * skb)464 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
465 {
466 const struct ieee80211_hdr *hdr =
467 (const struct ieee80211_hdr *)skb->data;
468 unsigned int hdrlen;
469
470 if (unlikely(skb->len < 10))
471 return 0;
472 hdrlen = ieee80211_hdrlen(hdr->frame_control);
473 if (unlikely(hdrlen > skb->len))
474 return 0;
475 return hdrlen;
476 }
477 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
478
__ieee80211_get_mesh_hdrlen(u8 flags)479 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
480 {
481 int ae = flags & MESH_FLAGS_AE;
482 /* 802.11-2012, 8.2.4.7.3 */
483 switch (ae) {
484 default:
485 case 0:
486 return 6;
487 case MESH_FLAGS_AE_A4:
488 return 12;
489 case MESH_FLAGS_AE_A5_A6:
490 return 18;
491 }
492 }
493
ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr * meshhdr)494 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
495 {
496 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
497 }
498 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
499
ieee80211_data_to_8023_exthdr_bool(struct sk_buff * skb,struct ethhdr * ehdr,const u8 * addr,enum nl80211_iftype iftype,u8 data_offset,bool is_amsdu)500 int ieee80211_data_to_8023_exthdr_bool(struct sk_buff *skb, struct ethhdr *ehdr,
501 const u8 *addr, enum nl80211_iftype iftype,
502 u8 data_offset, bool is_amsdu)
503 {
504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
505 struct {
506 u8 hdr[ETH_ALEN] __aligned(2);
507 __be16 proto;
508 } payload;
509 struct ethhdr tmp;
510 u16 hdrlen;
511 u8 mesh_flags = 0;
512
513 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
514 return -1;
515
516 hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
517 if (skb->len < hdrlen + 8)
518 return -1;
519
520 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
521 * header
522 * IEEE 802.11 address fields:
523 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
524 * 0 0 DA SA BSSID n/a
525 * 0 1 DA BSSID SA n/a
526 * 1 0 BSSID SA DA n/a
527 * 1 1 RA TA DA SA
528 */
529 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
530 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
531
532 if (iftype == NL80211_IFTYPE_MESH_POINT)
533 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
534
535 mesh_flags &= MESH_FLAGS_AE;
536
537 switch (hdr->frame_control &
538 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
539 case cpu_to_le16(IEEE80211_FCTL_TODS):
540 if (unlikely(iftype != NL80211_IFTYPE_AP &&
541 iftype != NL80211_IFTYPE_AP_VLAN &&
542 iftype != NL80211_IFTYPE_P2P_GO))
543 return -1;
544 break;
545 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
546 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
547 iftype != NL80211_IFTYPE_MESH_POINT &&
548 iftype != NL80211_IFTYPE_AP_VLAN &&
549 iftype != NL80211_IFTYPE_STATION))
550 return -1;
551 if (iftype == NL80211_IFTYPE_MESH_POINT) {
552 if (mesh_flags == MESH_FLAGS_AE_A4)
553 return -1;
554 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
555 skb_copy_bits(skb, hdrlen +
556 offsetof(struct ieee80211s_hdr, eaddr1),
557 tmp.h_dest, 2 * ETH_ALEN);
558 }
559 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
560 }
561 break;
562 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
563 if ((iftype != NL80211_IFTYPE_STATION &&
564 iftype != NL80211_IFTYPE_P2P_CLIENT &&
565 iftype != NL80211_IFTYPE_MESH_POINT) ||
566 (is_multicast_ether_addr(tmp.h_dest) &&
567 ether_addr_equal(tmp.h_source, addr)))
568 return -1;
569 if (iftype == NL80211_IFTYPE_MESH_POINT) {
570 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
571 return -1;
572 if (mesh_flags == MESH_FLAGS_AE_A4)
573 skb_copy_bits(skb, hdrlen +
574 offsetof(struct ieee80211s_hdr, eaddr1),
575 tmp.h_source, ETH_ALEN);
576 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
577 }
578 break;
579 case cpu_to_le16(0):
580 if (iftype != NL80211_IFTYPE_ADHOC &&
581 iftype != NL80211_IFTYPE_STATION &&
582 iftype != NL80211_IFTYPE_OCB)
583 return -1;
584 break;
585 }
586
587 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
588 tmp.h_proto = payload.proto;
589
590 if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
591 tmp.h_proto != htons(ETH_P_AARP) &&
592 tmp.h_proto != htons(ETH_P_IPX)) ||
593 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
594 /* remove RFC1042 or Bridge-Tunnel encapsulation and
595 * replace EtherType */
596 hdrlen += ETH_ALEN + 2;
597 else
598 tmp.h_proto = htons(skb->len - hdrlen);
599
600 pskb_pull(skb, hdrlen);
601
602 if (!ehdr)
603 ehdr = skb_push(skb, sizeof(struct ethhdr));
604 memcpy(ehdr, &tmp, sizeof(tmp));
605
606 return 0;
607 }
608 EXPORT_SYMBOL_GPL(ieee80211_data_to_8023_exthdr_bool);
609
ieee80211_data_to_8023_exthdr(struct sk_buff * skb,struct ethhdr * ehdr,const u8 * addr,enum nl80211_iftype iftype,u8 data_offset)610 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
611 const u8 *addr, enum nl80211_iftype iftype,
612 u8 data_offset)
613 {
614 return ieee80211_data_to_8023_exthdr_bool(skb, ehdr, addr, iftype,
615 data_offset, false);
616 }
617 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
618
619 static void
__frame_add_frag(struct sk_buff * skb,struct page * page,void * ptr,int len,int size)620 __frame_add_frag(struct sk_buff *skb, struct page *page,
621 void *ptr, int len, int size)
622 {
623 struct skb_shared_info *sh = skb_shinfo(skb);
624 int page_offset;
625
626 get_page(page);
627 page_offset = ptr - page_address(page);
628 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
629 }
630
631 static void
__ieee80211_amsdu_copy_frag(struct sk_buff * skb,struct sk_buff * frame,int offset,int len)632 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
633 int offset, int len)
634 {
635 struct skb_shared_info *sh = skb_shinfo(skb);
636 const skb_frag_t *frag = &sh->frags[0];
637 struct page *frag_page;
638 void *frag_ptr;
639 int frag_len, frag_size;
640 int head_size = skb->len - skb->data_len;
641 int cur_len;
642
643 frag_page = virt_to_head_page(skb->head);
644 frag_ptr = skb->data;
645 frag_size = head_size;
646
647 while (offset >= frag_size) {
648 offset -= frag_size;
649 frag_page = skb_frag_page(frag);
650 frag_ptr = skb_frag_address(frag);
651 frag_size = skb_frag_size(frag);
652 frag++;
653 }
654
655 frag_ptr += offset;
656 frag_len = frag_size - offset;
657
658 cur_len = min(len, frag_len);
659
660 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
661 len -= cur_len;
662
663 while (len > 0) {
664 frag_len = skb_frag_size(frag);
665 cur_len = min(len, frag_len);
666 __frame_add_frag(frame, skb_frag_page(frag),
667 skb_frag_address(frag), cur_len, frag_len);
668 len -= cur_len;
669 frag++;
670 }
671 }
672
673 static struct sk_buff *
__ieee80211_amsdu_copy(struct sk_buff * skb,unsigned int hlen,int offset,int len,bool reuse_frag)674 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
675 int offset, int len, bool reuse_frag)
676 {
677 struct sk_buff *frame;
678 int cur_len = len;
679
680 if (skb->len - offset < len)
681 return NULL;
682
683 /*
684 * When reusing framents, copy some data to the head to simplify
685 * ethernet header handling and speed up protocol header processing
686 * in the stack later.
687 */
688 if (reuse_frag)
689 cur_len = min_t(int, len, 32);
690
691 /*
692 * Allocate and reserve two bytes more for payload
693 * alignment since sizeof(struct ethhdr) is 14.
694 */
695 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
696 if (!frame)
697 return NULL;
698
699 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
700 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
701
702 len -= cur_len;
703 if (!len)
704 return frame;
705
706 offset += cur_len;
707 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
708
709 return frame;
710 }
711
ieee80211_amsdu_to_8023s(struct sk_buff * skb,struct sk_buff_head * list,const u8 * addr,enum nl80211_iftype iftype,const unsigned int extra_headroom,const u8 * check_da,const u8 * check_sa)712 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
713 const u8 *addr, enum nl80211_iftype iftype,
714 const unsigned int extra_headroom,
715 const u8 *check_da, const u8 *check_sa)
716 {
717 unsigned int hlen = ALIGN(extra_headroom, 4);
718 struct sk_buff *frame = NULL;
719 u16 ethertype;
720 u8 *payload;
721 int offset = 0, remaining;
722 struct ethhdr eth;
723 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
724 bool reuse_skb = false;
725 bool last = false;
726
727 while (!last) {
728 unsigned int subframe_len;
729 int len;
730 u8 padding;
731
732 skb_copy_bits(skb, offset, ð, sizeof(eth));
733 len = ntohs(eth.h_proto);
734 subframe_len = sizeof(struct ethhdr) + len;
735 padding = (4 - subframe_len) & 0x3;
736
737 /* the last MSDU has no padding */
738 remaining = skb->len - offset;
739 if (subframe_len > remaining)
740 goto purge;
741 /* mitigate A-MSDU aggregation injection attacks */
742 if (ether_addr_equal(eth.h_dest, rfc1042_header))
743 goto purge;
744
745 offset += sizeof(struct ethhdr);
746 last = remaining <= subframe_len + padding;
747
748 /* FIXME: should we really accept multicast DA? */
749 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
750 !ether_addr_equal(check_da, eth.h_dest)) ||
751 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
752 offset += len + padding;
753 continue;
754 }
755
756 /* reuse skb for the last subframe */
757 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
758 skb_pull(skb, offset);
759 frame = skb;
760 reuse_skb = true;
761 } else {
762 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
763 reuse_frag);
764 if (!frame)
765 goto purge;
766
767 offset += len + padding;
768 }
769
770 skb_reset_network_header(frame);
771 frame->dev = skb->dev;
772 frame->priority = skb->priority;
773
774 payload = frame->data;
775 ethertype = (payload[6] << 8) | payload[7];
776 if (likely((ether_addr_equal(payload, rfc1042_header) &&
777 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
778 ether_addr_equal(payload, bridge_tunnel_header))) {
779 eth.h_proto = htons(ethertype);
780 skb_pull(frame, ETH_ALEN + 2);
781 }
782
783 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
784 __skb_queue_tail(list, frame);
785 }
786
787 if (!reuse_skb)
788 dev_kfree_skb(skb);
789
790 return;
791
792 purge:
793 __skb_queue_purge(list);
794 dev_kfree_skb(skb);
795 }
796 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
797
798 /* Given a data frame determine the 802.1p/1d tag to use. */
cfg80211_classify8021d(struct sk_buff * skb,struct cfg80211_qos_map * qos_map)799 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
800 struct cfg80211_qos_map *qos_map)
801 {
802 unsigned int dscp;
803 unsigned char vlan_priority;
804 unsigned int ret;
805
806 /* skb->priority values from 256->263 are magic values to
807 * directly indicate a specific 802.1d priority. This is used
808 * to allow 802.1d priority to be passed directly in from VLAN
809 * tags, etc.
810 */
811 if (skb->priority >= 256 && skb->priority <= 263) {
812 ret = skb->priority - 256;
813 goto out;
814 }
815
816 if (skb_vlan_tag_present(skb)) {
817 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
818 >> VLAN_PRIO_SHIFT;
819 if (vlan_priority > 0) {
820 ret = vlan_priority;
821 goto out;
822 }
823 }
824
825 switch (skb->protocol) {
826 case htons(ETH_P_IP):
827 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
828 break;
829 case htons(ETH_P_IPV6):
830 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
831 break;
832 case htons(ETH_P_MPLS_UC):
833 case htons(ETH_P_MPLS_MC): {
834 struct mpls_label mpls_tmp, *mpls;
835
836 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
837 sizeof(*mpls), &mpls_tmp);
838 if (!mpls)
839 return 0;
840
841 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
842 >> MPLS_LS_TC_SHIFT;
843 goto out;
844 }
845 case htons(ETH_P_80221):
846 /* 802.21 is always network control traffic */
847 return 7;
848 default:
849 return 0;
850 }
851
852 if (qos_map) {
853 unsigned int i, tmp_dscp = dscp >> 2;
854
855 for (i = 0; i < qos_map->num_des; i++) {
856 if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
857 ret = qos_map->dscp_exception[i].up;
858 goto out;
859 }
860 }
861
862 for (i = 0; i < 8; i++) {
863 if (tmp_dscp >= qos_map->up[i].low &&
864 tmp_dscp <= qos_map->up[i].high) {
865 ret = i;
866 goto out;
867 }
868 }
869 }
870
871 ret = dscp >> 5;
872 out:
873 return array_index_nospec(ret, IEEE80211_NUM_TIDS);
874 }
875 EXPORT_SYMBOL(cfg80211_classify8021d);
876
ieee80211_bss_get_elem(struct cfg80211_bss * bss,u8 id)877 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
878 {
879 const struct cfg80211_bss_ies *ies;
880
881 ies = rcu_dereference(bss->ies);
882 if (!ies)
883 return NULL;
884
885 return cfg80211_find_elem(id, ies->data, ies->len);
886 }
887 EXPORT_SYMBOL(ieee80211_bss_get_elem);
888
cfg80211_upload_connect_keys(struct wireless_dev * wdev)889 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
890 {
891 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
892 struct net_device *dev = wdev->netdev;
893 int i;
894
895 if (!wdev->connect_keys)
896 return;
897
898 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
899 if (!wdev->connect_keys->params[i].cipher)
900 continue;
901 if (rdev_add_key(rdev, dev, i, false, NULL,
902 &wdev->connect_keys->params[i])) {
903 netdev_err(dev, "failed to set key %d\n", i);
904 continue;
905 }
906 if (wdev->connect_keys->def == i &&
907 rdev_set_default_key(rdev, dev, i, true, true)) {
908 netdev_err(dev, "failed to set defkey %d\n", i);
909 continue;
910 }
911 }
912
913 kzfree(wdev->connect_keys);
914 wdev->connect_keys = NULL;
915 }
916
cfg80211_process_wdev_events(struct wireless_dev * wdev)917 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
918 {
919 struct cfg80211_event *ev;
920 unsigned long flags;
921
922 spin_lock_irqsave(&wdev->event_lock, flags);
923 while (!list_empty(&wdev->event_list)) {
924 ev = list_first_entry(&wdev->event_list,
925 struct cfg80211_event, list);
926 list_del(&ev->list);
927 spin_unlock_irqrestore(&wdev->event_lock, flags);
928
929 wdev_lock(wdev);
930 switch (ev->type) {
931 case EVENT_CONNECT_RESULT:
932 __cfg80211_connect_result(
933 wdev->netdev,
934 &ev->cr,
935 ev->cr.status == WLAN_STATUS_SUCCESS);
936 break;
937 case EVENT_ROAMED:
938 __cfg80211_roamed(wdev, &ev->rm);
939 break;
940 case EVENT_DISCONNECTED:
941 __cfg80211_disconnected(wdev->netdev,
942 ev->dc.ie, ev->dc.ie_len,
943 ev->dc.reason,
944 !ev->dc.locally_generated);
945 break;
946 case EVENT_IBSS_JOINED:
947 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
948 ev->ij.channel);
949 break;
950 case EVENT_STOPPED:
951 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
952 break;
953 case EVENT_PORT_AUTHORIZED:
954 __cfg80211_port_authorized(wdev, ev->pa.bssid);
955 break;
956 }
957 wdev_unlock(wdev);
958
959 kfree(ev);
960
961 spin_lock_irqsave(&wdev->event_lock, flags);
962 }
963 spin_unlock_irqrestore(&wdev->event_lock, flags);
964 }
965
cfg80211_process_rdev_events(struct cfg80211_registered_device * rdev)966 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
967 {
968 struct wireless_dev *wdev;
969
970 ASSERT_RTNL();
971
972 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
973 cfg80211_process_wdev_events(wdev);
974 }
975
cfg80211_change_iface(struct cfg80211_registered_device * rdev,struct net_device * dev,enum nl80211_iftype ntype,struct vif_params * params)976 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
977 struct net_device *dev, enum nl80211_iftype ntype,
978 struct vif_params *params)
979 {
980 int err;
981 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
982
983 ASSERT_RTNL();
984
985 /* don't support changing VLANs, you just re-create them */
986 if (otype == NL80211_IFTYPE_AP_VLAN)
987 return -EOPNOTSUPP;
988
989 /* cannot change into P2P device or NAN */
990 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
991 ntype == NL80211_IFTYPE_NAN)
992 return -EOPNOTSUPP;
993
994 if (!rdev->ops->change_virtual_intf ||
995 !(rdev->wiphy.interface_modes & (1 << ntype)))
996 return -EOPNOTSUPP;
997
998 if (ntype != otype) {
999 /* if it's part of a bridge, reject changing type to station/ibss */
1000 if (netif_is_bridge_port(dev) &&
1001 (ntype == NL80211_IFTYPE_ADHOC ||
1002 ntype == NL80211_IFTYPE_STATION ||
1003 ntype == NL80211_IFTYPE_P2P_CLIENT))
1004 return -EBUSY;
1005
1006 dev->ieee80211_ptr->use_4addr = false;
1007 dev->ieee80211_ptr->mesh_id_up_len = 0;
1008 wdev_lock(dev->ieee80211_ptr);
1009 rdev_set_qos_map(rdev, dev, NULL);
1010 wdev_unlock(dev->ieee80211_ptr);
1011
1012 switch (otype) {
1013 case NL80211_IFTYPE_AP:
1014 case NL80211_IFTYPE_P2P_GO:
1015 cfg80211_stop_ap(rdev, dev, true);
1016 break;
1017 case NL80211_IFTYPE_ADHOC:
1018 cfg80211_leave_ibss(rdev, dev, false);
1019 break;
1020 case NL80211_IFTYPE_STATION:
1021 case NL80211_IFTYPE_P2P_CLIENT:
1022 wdev_lock(dev->ieee80211_ptr);
1023 cfg80211_disconnect(rdev, dev,
1024 WLAN_REASON_DEAUTH_LEAVING, true);
1025 wdev_unlock(dev->ieee80211_ptr);
1026 break;
1027 case NL80211_IFTYPE_MESH_POINT:
1028 /* mesh should be handled? */
1029 break;
1030 case NL80211_IFTYPE_OCB:
1031 cfg80211_leave_ocb(rdev, dev);
1032 break;
1033 default:
1034 break;
1035 }
1036
1037 cfg80211_process_rdev_events(rdev);
1038 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1039 }
1040
1041 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1042
1043 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1044
1045 if (!err && params && params->use_4addr != -1)
1046 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1047
1048 if (!err) {
1049 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1050 switch (ntype) {
1051 case NL80211_IFTYPE_STATION:
1052 if (dev->ieee80211_ptr->use_4addr)
1053 break;
1054 /* fall through */
1055 case NL80211_IFTYPE_OCB:
1056 case NL80211_IFTYPE_P2P_CLIENT:
1057 case NL80211_IFTYPE_ADHOC:
1058 dev->priv_flags |= IFF_DONT_BRIDGE;
1059 break;
1060 case NL80211_IFTYPE_P2P_GO:
1061 case NL80211_IFTYPE_AP:
1062 case NL80211_IFTYPE_AP_VLAN:
1063 case NL80211_IFTYPE_WDS:
1064 case NL80211_IFTYPE_MESH_POINT:
1065 /* bridging OK */
1066 break;
1067 case NL80211_IFTYPE_MONITOR:
1068 /* monitor can't bridge anyway */
1069 break;
1070 case NL80211_IFTYPE_UNSPECIFIED:
1071 case NUM_NL80211_IFTYPES:
1072 /* not happening */
1073 break;
1074 case NL80211_IFTYPE_P2P_DEVICE:
1075 case NL80211_IFTYPE_NAN:
1076 WARN_ON(1);
1077 break;
1078 }
1079 }
1080
1081 if (!err && ntype != otype && netif_running(dev)) {
1082 cfg80211_update_iface_num(rdev, ntype, 1);
1083 cfg80211_update_iface_num(rdev, otype, -1);
1084 }
1085
1086 return err;
1087 }
1088
cfg80211_calculate_bitrate_ht(struct rate_info * rate)1089 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1090 {
1091 int modulation, streams, bitrate;
1092
1093 /* the formula below does only work for MCS values smaller than 32 */
1094 if (WARN_ON_ONCE(rate->mcs >= 32))
1095 return 0;
1096
1097 modulation = rate->mcs & 7;
1098 streams = (rate->mcs >> 3) + 1;
1099
1100 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1101
1102 if (modulation < 4)
1103 bitrate *= (modulation + 1);
1104 else if (modulation == 4)
1105 bitrate *= (modulation + 2);
1106 else
1107 bitrate *= (modulation + 3);
1108
1109 bitrate *= streams;
1110
1111 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1112 bitrate = (bitrate / 9) * 10;
1113
1114 /* do NOT round down here */
1115 return (bitrate + 50000) / 100000;
1116 }
1117
cfg80211_calculate_bitrate_dmg(struct rate_info * rate)1118 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1119 {
1120 static const u32 __mcs2bitrate[] = {
1121 /* control PHY */
1122 [0] = 275,
1123 /* SC PHY */
1124 [1] = 3850,
1125 [2] = 7700,
1126 [3] = 9625,
1127 [4] = 11550,
1128 [5] = 12512, /* 1251.25 mbps */
1129 [6] = 15400,
1130 [7] = 19250,
1131 [8] = 23100,
1132 [9] = 25025,
1133 [10] = 30800,
1134 [11] = 38500,
1135 [12] = 46200,
1136 /* OFDM PHY */
1137 [13] = 6930,
1138 [14] = 8662, /* 866.25 mbps */
1139 [15] = 13860,
1140 [16] = 17325,
1141 [17] = 20790,
1142 [18] = 27720,
1143 [19] = 34650,
1144 [20] = 41580,
1145 [21] = 45045,
1146 [22] = 51975,
1147 [23] = 62370,
1148 [24] = 67568, /* 6756.75 mbps */
1149 /* LP-SC PHY */
1150 [25] = 6260,
1151 [26] = 8340,
1152 [27] = 11120,
1153 [28] = 12510,
1154 [29] = 16680,
1155 [30] = 22240,
1156 [31] = 25030,
1157 };
1158
1159 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1160 return 0;
1161
1162 return __mcs2bitrate[rate->mcs];
1163 }
1164
cfg80211_calculate_bitrate_edmg(struct rate_info * rate)1165 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1166 {
1167 static const u32 __mcs2bitrate[] = {
1168 /* control PHY */
1169 [0] = 275,
1170 /* SC PHY */
1171 [1] = 3850,
1172 [2] = 7700,
1173 [3] = 9625,
1174 [4] = 11550,
1175 [5] = 12512, /* 1251.25 mbps */
1176 [6] = 13475,
1177 [7] = 15400,
1178 [8] = 19250,
1179 [9] = 23100,
1180 [10] = 25025,
1181 [11] = 26950,
1182 [12] = 30800,
1183 [13] = 38500,
1184 [14] = 46200,
1185 [15] = 50050,
1186 [16] = 53900,
1187 [17] = 57750,
1188 [18] = 69300,
1189 [19] = 75075,
1190 [20] = 80850,
1191 };
1192
1193 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1194 return 0;
1195
1196 return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1197 }
1198
cfg80211_calculate_bitrate_vht(struct rate_info * rate)1199 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1200 {
1201 static const u32 base[4][10] = {
1202 { 6500000,
1203 13000000,
1204 19500000,
1205 26000000,
1206 39000000,
1207 52000000,
1208 58500000,
1209 65000000,
1210 78000000,
1211 /* not in the spec, but some devices use this: */
1212 86500000,
1213 },
1214 { 13500000,
1215 27000000,
1216 40500000,
1217 54000000,
1218 81000000,
1219 108000000,
1220 121500000,
1221 135000000,
1222 162000000,
1223 180000000,
1224 },
1225 { 29300000,
1226 58500000,
1227 87800000,
1228 117000000,
1229 175500000,
1230 234000000,
1231 263300000,
1232 292500000,
1233 351000000,
1234 390000000,
1235 },
1236 { 58500000,
1237 117000000,
1238 175500000,
1239 234000000,
1240 351000000,
1241 468000000,
1242 526500000,
1243 585000000,
1244 702000000,
1245 780000000,
1246 },
1247 };
1248 u32 bitrate;
1249 int idx;
1250
1251 if (rate->mcs > 9)
1252 goto warn;
1253
1254 switch (rate->bw) {
1255 case RATE_INFO_BW_160:
1256 idx = 3;
1257 break;
1258 case RATE_INFO_BW_80:
1259 idx = 2;
1260 break;
1261 case RATE_INFO_BW_40:
1262 idx = 1;
1263 break;
1264 case RATE_INFO_BW_5:
1265 case RATE_INFO_BW_10:
1266 default:
1267 goto warn;
1268 case RATE_INFO_BW_20:
1269 idx = 0;
1270 }
1271
1272 bitrate = base[idx][rate->mcs];
1273 bitrate *= rate->nss;
1274
1275 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1276 bitrate = (bitrate / 9) * 10;
1277
1278 /* do NOT round down here */
1279 return (bitrate + 50000) / 100000;
1280 warn:
1281 WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1282 rate->bw, rate->mcs, rate->nss);
1283 return 0;
1284 }
1285
cfg80211_calculate_bitrate_he(struct rate_info * rate)1286 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1287 {
1288 #define SCALE 2048
1289 u16 mcs_divisors[12] = {
1290 34133, /* 16.666666... */
1291 17067, /* 8.333333... */
1292 11378, /* 5.555555... */
1293 8533, /* 4.166666... */
1294 5689, /* 2.777777... */
1295 4267, /* 2.083333... */
1296 3923, /* 1.851851... */
1297 3413, /* 1.666666... */
1298 2844, /* 1.388888... */
1299 2560, /* 1.250000... */
1300 2276, /* 1.111111... */
1301 2048, /* 1.000000... */
1302 };
1303 u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1304 u32 rates_969[3] = { 480388888, 453700000, 408333333 };
1305 u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1306 u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1307 u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1308 u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1309 u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1310 u64 tmp;
1311 u32 result;
1312
1313 if (WARN_ON_ONCE(rate->mcs > 11))
1314 return 0;
1315
1316 if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1317 return 0;
1318 if (WARN_ON_ONCE(rate->he_ru_alloc >
1319 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1320 return 0;
1321 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1322 return 0;
1323
1324 if (rate->bw == RATE_INFO_BW_160)
1325 result = rates_160M[rate->he_gi];
1326 else if (rate->bw == RATE_INFO_BW_80 ||
1327 (rate->bw == RATE_INFO_BW_HE_RU &&
1328 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1329 result = rates_969[rate->he_gi];
1330 else if (rate->bw == RATE_INFO_BW_40 ||
1331 (rate->bw == RATE_INFO_BW_HE_RU &&
1332 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1333 result = rates_484[rate->he_gi];
1334 else if (rate->bw == RATE_INFO_BW_20 ||
1335 (rate->bw == RATE_INFO_BW_HE_RU &&
1336 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1337 result = rates_242[rate->he_gi];
1338 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1339 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1340 result = rates_106[rate->he_gi];
1341 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1342 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1343 result = rates_52[rate->he_gi];
1344 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1345 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1346 result = rates_26[rate->he_gi];
1347 else {
1348 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1349 rate->bw, rate->he_ru_alloc);
1350 return 0;
1351 }
1352
1353 /* now scale to the appropriate MCS */
1354 tmp = result;
1355 tmp *= SCALE;
1356 do_div(tmp, mcs_divisors[rate->mcs]);
1357 result = tmp;
1358
1359 /* and take NSS, DCM into account */
1360 result = (result * rate->nss) / 8;
1361 if (rate->he_dcm)
1362 result /= 2;
1363
1364 return result / 10000;
1365 }
1366
cfg80211_calculate_bitrate(struct rate_info * rate)1367 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1368 {
1369 if (rate->flags & RATE_INFO_FLAGS_MCS)
1370 return cfg80211_calculate_bitrate_ht(rate);
1371 if (rate->flags & RATE_INFO_FLAGS_DMG)
1372 return cfg80211_calculate_bitrate_dmg(rate);
1373 if (rate->flags & RATE_INFO_FLAGS_EDMG)
1374 return cfg80211_calculate_bitrate_edmg(rate);
1375 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1376 return cfg80211_calculate_bitrate_vht(rate);
1377 if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1378 return cfg80211_calculate_bitrate_he(rate);
1379
1380 return rate->legacy;
1381 }
1382 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1383
cfg80211_get_p2p_attr(const u8 * ies,unsigned int len,enum ieee80211_p2p_attr_id attr,u8 * buf,unsigned int bufsize)1384 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1385 enum ieee80211_p2p_attr_id attr,
1386 u8 *buf, unsigned int bufsize)
1387 {
1388 u8 *out = buf;
1389 u16 attr_remaining = 0;
1390 bool desired_attr = false;
1391 u16 desired_len = 0;
1392
1393 while (len > 0) {
1394 unsigned int iedatalen;
1395 unsigned int copy;
1396 const u8 *iedata;
1397
1398 if (len < 2)
1399 return -EILSEQ;
1400 iedatalen = ies[1];
1401 if (iedatalen + 2 > len)
1402 return -EILSEQ;
1403
1404 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1405 goto cont;
1406
1407 if (iedatalen < 4)
1408 goto cont;
1409
1410 iedata = ies + 2;
1411
1412 /* check WFA OUI, P2P subtype */
1413 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1414 iedata[2] != 0x9a || iedata[3] != 0x09)
1415 goto cont;
1416
1417 iedatalen -= 4;
1418 iedata += 4;
1419
1420 /* check attribute continuation into this IE */
1421 copy = min_t(unsigned int, attr_remaining, iedatalen);
1422 if (copy && desired_attr) {
1423 desired_len += copy;
1424 if (out) {
1425 memcpy(out, iedata, min(bufsize, copy));
1426 out += min(bufsize, copy);
1427 bufsize -= min(bufsize, copy);
1428 }
1429
1430
1431 if (copy == attr_remaining)
1432 return desired_len;
1433 }
1434
1435 attr_remaining -= copy;
1436 if (attr_remaining)
1437 goto cont;
1438
1439 iedatalen -= copy;
1440 iedata += copy;
1441
1442 while (iedatalen > 0) {
1443 u16 attr_len;
1444
1445 /* P2P attribute ID & size must fit */
1446 if (iedatalen < 3)
1447 return -EILSEQ;
1448 desired_attr = iedata[0] == attr;
1449 attr_len = get_unaligned_le16(iedata + 1);
1450 iedatalen -= 3;
1451 iedata += 3;
1452
1453 copy = min_t(unsigned int, attr_len, iedatalen);
1454
1455 if (desired_attr) {
1456 desired_len += copy;
1457 if (out) {
1458 memcpy(out, iedata, min(bufsize, copy));
1459 out += min(bufsize, copy);
1460 bufsize -= min(bufsize, copy);
1461 }
1462
1463 if (copy == attr_len)
1464 return desired_len;
1465 }
1466
1467 iedata += copy;
1468 iedatalen -= copy;
1469 attr_remaining = attr_len - copy;
1470 }
1471
1472 cont:
1473 len -= ies[1] + 2;
1474 ies += ies[1] + 2;
1475 }
1476
1477 if (attr_remaining && desired_attr)
1478 return -EILSEQ;
1479
1480 return -ENOENT;
1481 }
1482 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1483
ieee80211_id_in_list(const u8 * ids,int n_ids,u8 id,bool id_ext)1484 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1485 {
1486 int i;
1487
1488 /* Make sure array values are legal */
1489 if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1490 return false;
1491
1492 i = 0;
1493 while (i < n_ids) {
1494 if (ids[i] == WLAN_EID_EXTENSION) {
1495 if (id_ext && (ids[i + 1] == id))
1496 return true;
1497
1498 i += 2;
1499 continue;
1500 }
1501
1502 if (ids[i] == id && !id_ext)
1503 return true;
1504
1505 i++;
1506 }
1507 return false;
1508 }
1509
skip_ie(const u8 * ies,size_t ielen,size_t pos)1510 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1511 {
1512 /* we assume a validly formed IEs buffer */
1513 u8 len = ies[pos + 1];
1514
1515 pos += 2 + len;
1516
1517 /* the IE itself must have 255 bytes for fragments to follow */
1518 if (len < 255)
1519 return pos;
1520
1521 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1522 len = ies[pos + 1];
1523 pos += 2 + len;
1524 }
1525
1526 return pos;
1527 }
1528
ieee80211_ie_split_ric(const u8 * ies,size_t ielen,const u8 * ids,int n_ids,const u8 * after_ric,int n_after_ric,size_t offset)1529 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1530 const u8 *ids, int n_ids,
1531 const u8 *after_ric, int n_after_ric,
1532 size_t offset)
1533 {
1534 size_t pos = offset;
1535
1536 while (pos < ielen) {
1537 u8 ext = 0;
1538
1539 if (ies[pos] == WLAN_EID_EXTENSION)
1540 ext = 2;
1541 if ((pos + ext) >= ielen)
1542 break;
1543
1544 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1545 ies[pos] == WLAN_EID_EXTENSION))
1546 break;
1547
1548 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1549 pos = skip_ie(ies, ielen, pos);
1550
1551 while (pos < ielen) {
1552 if (ies[pos] == WLAN_EID_EXTENSION)
1553 ext = 2;
1554 else
1555 ext = 0;
1556
1557 if ((pos + ext) >= ielen)
1558 break;
1559
1560 if (!ieee80211_id_in_list(after_ric,
1561 n_after_ric,
1562 ies[pos + ext],
1563 ext == 2))
1564 pos = skip_ie(ies, ielen, pos);
1565 else
1566 break;
1567 }
1568 } else {
1569 pos = skip_ie(ies, ielen, pos);
1570 }
1571 }
1572
1573 return pos;
1574 }
1575 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1576
ieee80211_operating_class_to_band(u8 operating_class,enum nl80211_band * band)1577 bool ieee80211_operating_class_to_band(u8 operating_class,
1578 enum nl80211_band *band)
1579 {
1580 switch (operating_class) {
1581 case 112:
1582 case 115 ... 127:
1583 case 128 ... 130:
1584 *band = NL80211_BAND_5GHZ;
1585 return true;
1586 case 131 ... 135:
1587 *band = NL80211_BAND_6GHZ;
1588 return true;
1589 case 81:
1590 case 82:
1591 case 83:
1592 case 84:
1593 *band = NL80211_BAND_2GHZ;
1594 return true;
1595 case 180:
1596 *band = NL80211_BAND_60GHZ;
1597 return true;
1598 }
1599
1600 return false;
1601 }
1602 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1603
ieee80211_chandef_to_operating_class(struct cfg80211_chan_def * chandef,u8 * op_class)1604 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1605 u8 *op_class)
1606 {
1607 u8 vht_opclass;
1608 u32 freq = chandef->center_freq1;
1609
1610 if (freq >= 2412 && freq <= 2472) {
1611 if (chandef->width > NL80211_CHAN_WIDTH_40)
1612 return false;
1613
1614 /* 2.407 GHz, channels 1..13 */
1615 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1616 if (freq > chandef->chan->center_freq)
1617 *op_class = 83; /* HT40+ */
1618 else
1619 *op_class = 84; /* HT40- */
1620 } else {
1621 *op_class = 81;
1622 }
1623
1624 return true;
1625 }
1626
1627 if (freq == 2484) {
1628 /* channel 14 is only for IEEE 802.11b */
1629 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1630 return false;
1631
1632 *op_class = 82; /* channel 14 */
1633 return true;
1634 }
1635
1636 switch (chandef->width) {
1637 case NL80211_CHAN_WIDTH_80:
1638 vht_opclass = 128;
1639 break;
1640 case NL80211_CHAN_WIDTH_160:
1641 vht_opclass = 129;
1642 break;
1643 case NL80211_CHAN_WIDTH_80P80:
1644 vht_opclass = 130;
1645 break;
1646 case NL80211_CHAN_WIDTH_10:
1647 case NL80211_CHAN_WIDTH_5:
1648 return false; /* unsupported for now */
1649 default:
1650 vht_opclass = 0;
1651 break;
1652 }
1653
1654 /* 5 GHz, channels 36..48 */
1655 if (freq >= 5180 && freq <= 5240) {
1656 if (vht_opclass) {
1657 *op_class = vht_opclass;
1658 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1659 if (freq > chandef->chan->center_freq)
1660 *op_class = 116;
1661 else
1662 *op_class = 117;
1663 } else {
1664 *op_class = 115;
1665 }
1666
1667 return true;
1668 }
1669
1670 /* 5 GHz, channels 52..64 */
1671 if (freq >= 5260 && freq <= 5320) {
1672 if (vht_opclass) {
1673 *op_class = vht_opclass;
1674 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1675 if (freq > chandef->chan->center_freq)
1676 *op_class = 119;
1677 else
1678 *op_class = 120;
1679 } else {
1680 *op_class = 118;
1681 }
1682
1683 return true;
1684 }
1685
1686 /* 5 GHz, channels 100..144 */
1687 if (freq >= 5500 && freq <= 5720) {
1688 if (vht_opclass) {
1689 *op_class = vht_opclass;
1690 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1691 if (freq > chandef->chan->center_freq)
1692 *op_class = 122;
1693 else
1694 *op_class = 123;
1695 } else {
1696 *op_class = 121;
1697 }
1698
1699 return true;
1700 }
1701
1702 /* 5 GHz, channels 149..169 */
1703 if (freq >= 5745 && freq <= 5845) {
1704 if (vht_opclass) {
1705 *op_class = vht_opclass;
1706 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1707 if (freq > chandef->chan->center_freq)
1708 *op_class = 126;
1709 else
1710 *op_class = 127;
1711 } else if (freq <= 5805) {
1712 *op_class = 124;
1713 } else {
1714 *op_class = 125;
1715 }
1716
1717 return true;
1718 }
1719
1720 /* 56.16 GHz, channel 1..4 */
1721 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1722 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1723 return false;
1724
1725 *op_class = 180;
1726 return true;
1727 }
1728
1729 /* not supported yet */
1730 return false;
1731 }
1732 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1733
cfg80211_calculate_bi_data(struct wiphy * wiphy,u32 new_beacon_int,u32 * beacon_int_gcd,bool * beacon_int_different)1734 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1735 u32 *beacon_int_gcd,
1736 bool *beacon_int_different)
1737 {
1738 struct wireless_dev *wdev;
1739
1740 *beacon_int_gcd = 0;
1741 *beacon_int_different = false;
1742
1743 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1744 if (!wdev->beacon_interval)
1745 continue;
1746
1747 if (!*beacon_int_gcd) {
1748 *beacon_int_gcd = wdev->beacon_interval;
1749 continue;
1750 }
1751
1752 if (wdev->beacon_interval == *beacon_int_gcd)
1753 continue;
1754
1755 *beacon_int_different = true;
1756 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1757 }
1758
1759 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1760 if (*beacon_int_gcd)
1761 *beacon_int_different = true;
1762 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1763 }
1764 }
1765
cfg80211_validate_beacon_int(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,u32 beacon_int)1766 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1767 enum nl80211_iftype iftype, u32 beacon_int)
1768 {
1769 /*
1770 * This is just a basic pre-condition check; if interface combinations
1771 * are possible the driver must already be checking those with a call
1772 * to cfg80211_check_combinations(), in which case we'll validate more
1773 * through the cfg80211_calculate_bi_data() call and code in
1774 * cfg80211_iter_combinations().
1775 */
1776
1777 if (beacon_int < 10 || beacon_int > 10000)
1778 return -EINVAL;
1779
1780 return 0;
1781 }
1782
cfg80211_iter_combinations(struct wiphy * wiphy,struct iface_combination_params * params,void (* iter)(const struct ieee80211_iface_combination * c,void * data),void * data)1783 int cfg80211_iter_combinations(struct wiphy *wiphy,
1784 struct iface_combination_params *params,
1785 void (*iter)(const struct ieee80211_iface_combination *c,
1786 void *data),
1787 void *data)
1788 {
1789 const struct ieee80211_regdomain *regdom;
1790 enum nl80211_dfs_regions region = 0;
1791 int i, j, iftype;
1792 int num_interfaces = 0;
1793 u32 used_iftypes = 0;
1794 u32 beacon_int_gcd;
1795 bool beacon_int_different;
1796
1797 /*
1798 * This is a bit strange, since the iteration used to rely only on
1799 * the data given by the driver, but here it now relies on context,
1800 * in form of the currently operating interfaces.
1801 * This is OK for all current users, and saves us from having to
1802 * push the GCD calculations into all the drivers.
1803 * In the future, this should probably rely more on data that's in
1804 * cfg80211 already - the only thing not would appear to be any new
1805 * interfaces (while being brought up) and channel/radar data.
1806 */
1807 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1808 &beacon_int_gcd, &beacon_int_different);
1809
1810 if (params->radar_detect) {
1811 rcu_read_lock();
1812 regdom = rcu_dereference(cfg80211_regdomain);
1813 if (regdom)
1814 region = regdom->dfs_region;
1815 rcu_read_unlock();
1816 }
1817
1818 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1819 num_interfaces += params->iftype_num[iftype];
1820 if (params->iftype_num[iftype] > 0 &&
1821 !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1822 used_iftypes |= BIT(iftype);
1823 }
1824
1825 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1826 const struct ieee80211_iface_combination *c;
1827 struct ieee80211_iface_limit *limits;
1828 u32 all_iftypes = 0;
1829
1830 c = &wiphy->iface_combinations[i];
1831
1832 if (num_interfaces > c->max_interfaces)
1833 continue;
1834 if (params->num_different_channels > c->num_different_channels)
1835 continue;
1836
1837 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1838 GFP_KERNEL);
1839 if (!limits)
1840 return -ENOMEM;
1841
1842 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1843 if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1844 continue;
1845 for (j = 0; j < c->n_limits; j++) {
1846 all_iftypes |= limits[j].types;
1847 if (!(limits[j].types & BIT(iftype)))
1848 continue;
1849 if (limits[j].max < params->iftype_num[iftype])
1850 goto cont;
1851 limits[j].max -= params->iftype_num[iftype];
1852 }
1853 }
1854
1855 if (params->radar_detect !=
1856 (c->radar_detect_widths & params->radar_detect))
1857 goto cont;
1858
1859 if (params->radar_detect && c->radar_detect_regions &&
1860 !(c->radar_detect_regions & BIT(region)))
1861 goto cont;
1862
1863 /* Finally check that all iftypes that we're currently
1864 * using are actually part of this combination. If they
1865 * aren't then we can't use this combination and have
1866 * to continue to the next.
1867 */
1868 if ((all_iftypes & used_iftypes) != used_iftypes)
1869 goto cont;
1870
1871 if (beacon_int_gcd) {
1872 if (c->beacon_int_min_gcd &&
1873 beacon_int_gcd < c->beacon_int_min_gcd)
1874 goto cont;
1875 if (!c->beacon_int_min_gcd && beacon_int_different)
1876 goto cont;
1877 }
1878
1879 /* This combination covered all interface types and
1880 * supported the requested numbers, so we're good.
1881 */
1882
1883 (*iter)(c, data);
1884 cont:
1885 kfree(limits);
1886 }
1887
1888 return 0;
1889 }
1890 EXPORT_SYMBOL(cfg80211_iter_combinations);
1891
1892 static void
cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination * c,void * data)1893 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1894 void *data)
1895 {
1896 int *num = data;
1897 (*num)++;
1898 }
1899
cfg80211_check_combinations(struct wiphy * wiphy,struct iface_combination_params * params)1900 int cfg80211_check_combinations(struct wiphy *wiphy,
1901 struct iface_combination_params *params)
1902 {
1903 int err, num = 0;
1904
1905 err = cfg80211_iter_combinations(wiphy, params,
1906 cfg80211_iter_sum_ifcombs, &num);
1907 if (err)
1908 return err;
1909 if (num == 0)
1910 return -EBUSY;
1911
1912 return 0;
1913 }
1914 EXPORT_SYMBOL(cfg80211_check_combinations);
1915
ieee80211_get_ratemask(struct ieee80211_supported_band * sband,const u8 * rates,unsigned int n_rates,u32 * mask)1916 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1917 const u8 *rates, unsigned int n_rates,
1918 u32 *mask)
1919 {
1920 int i, j;
1921
1922 if (!sband)
1923 return -EINVAL;
1924
1925 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1926 return -EINVAL;
1927
1928 *mask = 0;
1929
1930 for (i = 0; i < n_rates; i++) {
1931 int rate = (rates[i] & 0x7f) * 5;
1932 bool found = false;
1933
1934 for (j = 0; j < sband->n_bitrates; j++) {
1935 if (sband->bitrates[j].bitrate == rate) {
1936 found = true;
1937 *mask |= BIT(j);
1938 break;
1939 }
1940 }
1941 if (!found)
1942 return -EINVAL;
1943 }
1944
1945 /*
1946 * mask must have at least one bit set here since we
1947 * didn't accept a 0-length rates array nor allowed
1948 * entries in the array that didn't exist
1949 */
1950
1951 return 0;
1952 }
1953
ieee80211_get_num_supported_channels(struct wiphy * wiphy)1954 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1955 {
1956 enum nl80211_band band;
1957 unsigned int n_channels = 0;
1958
1959 for (band = 0; band < NUM_NL80211_BANDS; band++)
1960 if (wiphy->bands[band])
1961 n_channels += wiphy->bands[band]->n_channels;
1962
1963 return n_channels;
1964 }
1965 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1966
cfg80211_get_station(struct net_device * dev,const u8 * mac_addr,struct station_info * sinfo)1967 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1968 struct station_info *sinfo)
1969 {
1970 struct cfg80211_registered_device *rdev;
1971 struct wireless_dev *wdev;
1972
1973 wdev = dev->ieee80211_ptr;
1974 if (!wdev)
1975 return -EOPNOTSUPP;
1976
1977 rdev = wiphy_to_rdev(wdev->wiphy);
1978 if (!rdev->ops->get_station)
1979 return -EOPNOTSUPP;
1980
1981 memset(sinfo, 0, sizeof(*sinfo));
1982
1983 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1984 }
1985 EXPORT_SYMBOL(cfg80211_get_station);
1986
cfg80211_free_nan_func(struct cfg80211_nan_func * f)1987 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1988 {
1989 int i;
1990
1991 if (!f)
1992 return;
1993
1994 kfree(f->serv_spec_info);
1995 kfree(f->srf_bf);
1996 kfree(f->srf_macs);
1997 for (i = 0; i < f->num_rx_filters; i++)
1998 kfree(f->rx_filters[i].filter);
1999
2000 for (i = 0; i < f->num_tx_filters; i++)
2001 kfree(f->tx_filters[i].filter);
2002
2003 kfree(f->rx_filters);
2004 kfree(f->tx_filters);
2005 kfree(f);
2006 }
2007 EXPORT_SYMBOL(cfg80211_free_nan_func);
2008
cfg80211_does_bw_fit_range(const struct ieee80211_freq_range * freq_range,u32 center_freq_khz,u32 bw_khz)2009 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
2010 u32 center_freq_khz, u32 bw_khz)
2011 {
2012 u32 start_freq_khz, end_freq_khz;
2013
2014 start_freq_khz = center_freq_khz - (bw_khz / 2);
2015 end_freq_khz = center_freq_khz + (bw_khz / 2);
2016
2017 if (start_freq_khz >= freq_range->start_freq_khz &&
2018 end_freq_khz <= freq_range->end_freq_khz)
2019 return true;
2020
2021 return false;
2022 }
2023
cfg80211_sinfo_alloc_tid_stats(struct station_info * sinfo,gfp_t gfp)2024 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
2025 {
2026 sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
2027 sizeof(*(sinfo->pertid)),
2028 gfp);
2029 if (!sinfo->pertid)
2030 return -ENOMEM;
2031
2032 return 0;
2033 }
2034 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
2035
2036 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
2037 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
2038 const unsigned char rfc1042_header[] __aligned(2) =
2039 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
2040 EXPORT_SYMBOL(rfc1042_header);
2041
2042 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2043 const unsigned char bridge_tunnel_header[] __aligned(2) =
2044 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2045 EXPORT_SYMBOL(bridge_tunnel_header);
2046
2047 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2048 struct iapp_layer2_update {
2049 u8 da[ETH_ALEN]; /* broadcast */
2050 u8 sa[ETH_ALEN]; /* STA addr */
2051 __be16 len; /* 6 */
2052 u8 dsap; /* 0 */
2053 u8 ssap; /* 0 */
2054 u8 control;
2055 u8 xid_info[3];
2056 } __packed;
2057
cfg80211_send_layer2_update(struct net_device * dev,const u8 * addr)2058 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2059 {
2060 struct iapp_layer2_update *msg;
2061 struct sk_buff *skb;
2062
2063 /* Send Level 2 Update Frame to update forwarding tables in layer 2
2064 * bridge devices */
2065
2066 skb = dev_alloc_skb(sizeof(*msg));
2067 if (!skb)
2068 return;
2069 msg = skb_put(skb, sizeof(*msg));
2070
2071 /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2072 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2073
2074 eth_broadcast_addr(msg->da);
2075 ether_addr_copy(msg->sa, addr);
2076 msg->len = htons(6);
2077 msg->dsap = 0;
2078 msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */
2079 msg->control = 0xaf; /* XID response lsb.1111F101.
2080 * F=0 (no poll command; unsolicited frame) */
2081 msg->xid_info[0] = 0x81; /* XID format identifier */
2082 msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
2083 msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */
2084
2085 skb->dev = dev;
2086 skb->protocol = eth_type_trans(skb, dev);
2087 memset(skb->cb, 0, sizeof(skb->cb));
2088 netif_rx_ni(skb);
2089 }
2090 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2091
ieee80211_get_vht_max_nss(struct ieee80211_vht_cap * cap,enum ieee80211_vht_chanwidth bw,int mcs,bool ext_nss_bw_capable)2092 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2093 enum ieee80211_vht_chanwidth bw,
2094 int mcs, bool ext_nss_bw_capable)
2095 {
2096 u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2097 int max_vht_nss = 0;
2098 int ext_nss_bw;
2099 int supp_width;
2100 int i, mcs_encoding;
2101
2102 if (map == 0xffff)
2103 return 0;
2104
2105 if (WARN_ON(mcs > 9))
2106 return 0;
2107 if (mcs <= 7)
2108 mcs_encoding = 0;
2109 else if (mcs == 8)
2110 mcs_encoding = 1;
2111 else
2112 mcs_encoding = 2;
2113
2114 /* find max_vht_nss for the given MCS */
2115 for (i = 7; i >= 0; i--) {
2116 int supp = (map >> (2 * i)) & 3;
2117
2118 if (supp == 3)
2119 continue;
2120
2121 if (supp >= mcs_encoding) {
2122 max_vht_nss = i + 1;
2123 break;
2124 }
2125 }
2126
2127 if (!(cap->supp_mcs.tx_mcs_map &
2128 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2129 return max_vht_nss;
2130
2131 ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2132 IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2133 supp_width = le32_get_bits(cap->vht_cap_info,
2134 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2135
2136 /* if not capable, treat ext_nss_bw as 0 */
2137 if (!ext_nss_bw_capable)
2138 ext_nss_bw = 0;
2139
2140 /* This is invalid */
2141 if (supp_width == 3)
2142 return 0;
2143
2144 /* This is an invalid combination so pretend nothing is supported */
2145 if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2146 return 0;
2147
2148 /*
2149 * Cover all the special cases according to IEEE 802.11-2016
2150 * Table 9-250. All other cases are either factor of 1 or not
2151 * valid/supported.
2152 */
2153 switch (bw) {
2154 case IEEE80211_VHT_CHANWIDTH_USE_HT:
2155 case IEEE80211_VHT_CHANWIDTH_80MHZ:
2156 if ((supp_width == 1 || supp_width == 2) &&
2157 ext_nss_bw == 3)
2158 return 2 * max_vht_nss;
2159 break;
2160 case IEEE80211_VHT_CHANWIDTH_160MHZ:
2161 if (supp_width == 0 &&
2162 (ext_nss_bw == 1 || ext_nss_bw == 2))
2163 return max_vht_nss / 2;
2164 if (supp_width == 0 &&
2165 ext_nss_bw == 3)
2166 return (3 * max_vht_nss) / 4;
2167 if (supp_width == 1 &&
2168 ext_nss_bw == 3)
2169 return 2 * max_vht_nss;
2170 break;
2171 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2172 if (supp_width == 0 && ext_nss_bw == 1)
2173 return 0; /* not possible */
2174 if (supp_width == 0 &&
2175 ext_nss_bw == 2)
2176 return max_vht_nss / 2;
2177 if (supp_width == 0 &&
2178 ext_nss_bw == 3)
2179 return (3 * max_vht_nss) / 4;
2180 if (supp_width == 1 &&
2181 ext_nss_bw == 0)
2182 return 0; /* not possible */
2183 if (supp_width == 1 &&
2184 ext_nss_bw == 1)
2185 return max_vht_nss / 2;
2186 if (supp_width == 1 &&
2187 ext_nss_bw == 2)
2188 return (3 * max_vht_nss) / 4;
2189 break;
2190 }
2191
2192 /* not covered or invalid combination received */
2193 return max_vht_nss;
2194 }
2195 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2196
cfg80211_iftype_allowed(struct wiphy * wiphy,enum nl80211_iftype iftype,bool is_4addr,u8 check_swif)2197 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2198 bool is_4addr, u8 check_swif)
2199
2200 {
2201 bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2202
2203 switch (check_swif) {
2204 case 0:
2205 if (is_vlan && is_4addr)
2206 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2207 return wiphy->interface_modes & BIT(iftype);
2208 case 1:
2209 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2210 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2211 return wiphy->software_iftypes & BIT(iftype);
2212 default:
2213 break;
2214 }
2215
2216 return false;
2217 }
2218 EXPORT_SYMBOL(cfg80211_iftype_allowed);
2219