1 // SPDX-License-Identifier: GPL-2.0
3 * Wireless utility functions
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) 2018-2020 Intel Corporation
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>
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>
27 struct ieee80211_rate *
28 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
29 u32 basic_rates, int bitrate)
31 struct ieee80211_rate *result = &sband->bitrates[0];
34 for (i = 0; i < sband->n_bitrates; i++) {
35 if (!(basic_rates & BIT(i)))
37 if (sband->bitrates[i].bitrate > bitrate)
39 result = &sband->bitrates[i];
44 EXPORT_SYMBOL(ieee80211_get_response_rate);
46 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
47 enum nl80211_bss_scan_width scan_width)
49 struct ieee80211_rate *bitrates;
50 u32 mandatory_rates = 0;
51 enum ieee80211_rate_flags mandatory_flag;
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;
62 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
64 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
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;
73 EXPORT_SYMBOL(ieee80211_mandatory_rates);
75 u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
77 /* see 802.11 17.3.8.3.2 and Annex J
78 * there are overlapping channel numbers in 5GHz and 2GHz bands */
80 return 0; /* not supported */
82 case NL80211_BAND_2GHZ:
84 return MHZ_TO_KHZ(2484);
86 return MHZ_TO_KHZ(2407 + chan * 5);
88 case NL80211_BAND_5GHZ:
89 if (chan >= 182 && chan <= 196)
90 return MHZ_TO_KHZ(4000 + chan * 5);
92 return MHZ_TO_KHZ(5000 + chan * 5);
94 case NL80211_BAND_6GHZ:
95 /* see 802.11ax D6.1 27.3.23.2 */
97 return MHZ_TO_KHZ(5935);
99 return MHZ_TO_KHZ(5950 + chan * 5);
101 case NL80211_BAND_60GHZ:
103 return MHZ_TO_KHZ(56160 + chan * 2160);
105 case NL80211_BAND_S1GHZ:
106 return 902000 + chan * 500;
110 return 0; /* not supported */
112 EXPORT_SYMBOL(ieee80211_channel_to_freq_khz);
114 int ieee80211_freq_khz_to_channel(u32 freq)
116 /* TODO: just handle MHz for now */
117 freq = KHZ_TO_MHZ(freq);
119 /* see 802.11 17.3.8.3.2 and Annex J */
122 else if (freq < 2484)
123 return (freq - 2407) / 5;
124 else if (freq >= 4910 && freq <= 4980)
125 return (freq - 4000) / 5;
126 else if (freq < 5945)
127 return (freq - 5000) / 5;
128 else if (freq <= 45000) /* DMG band lower limit */
129 /* see 802.11ax D4.1 27.3.22.2 */
130 return (freq - 5940) / 5;
131 else if (freq >= 58320 && freq <= 70200)
132 return (freq - 56160) / 2160;
136 EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
138 struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
141 enum nl80211_band band;
142 struct ieee80211_supported_band *sband;
145 for (band = 0; band < NUM_NL80211_BANDS; band++) {
146 sband = wiphy->bands[band];
151 for (i = 0; i < sband->n_channels; i++) {
152 struct ieee80211_channel *chan = &sband->channels[i];
154 if (ieee80211_channel_to_khz(chan) == freq)
161 EXPORT_SYMBOL(ieee80211_get_channel_khz);
163 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
167 switch (sband->band) {
168 case NL80211_BAND_5GHZ:
169 case NL80211_BAND_6GHZ:
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;
182 case NL80211_BAND_2GHZ:
184 for (i = 0; i < sband->n_bitrates; i++) {
185 switch (sband->bitrates[i].bitrate) {
190 sband->bitrates[i].flags |=
191 IEEE80211_RATE_MANDATORY_B |
192 IEEE80211_RATE_MANDATORY_G;
198 sband->bitrates[i].flags |=
199 IEEE80211_RATE_MANDATORY_G;
203 sband->bitrates[i].flags |=
204 IEEE80211_RATE_ERP_G;
208 WARN_ON(want != 0 && want != 3);
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);
215 case NL80211_BAND_S1GHZ:
216 /* Figure 9-589bd: 3 means unsupported, so != 3 means at least
219 WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
221 case NUM_NL80211_BANDS:
228 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
230 enum nl80211_band band;
232 for (band = 0; band < NUM_NL80211_BANDS; band++)
233 if (wiphy->bands[band])
234 set_mandatory_flags_band(wiphy->bands[band]);
237 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
240 for (i = 0; i < wiphy->n_cipher_suites; i++)
241 if (cipher == wiphy->cipher_suites[i])
246 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
247 struct key_params *params, int key_idx,
248 bool pairwise, const u8 *mac_addr)
252 if (wiphy_ext_feature_isset(&rdev->wiphy,
253 NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
254 wiphy_ext_feature_isset(&rdev->wiphy,
255 NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
257 if (key_idx < 0 || key_idx > max_key_idx)
260 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
263 if (pairwise && !mac_addr)
266 switch (params->cipher) {
267 case WLAN_CIPHER_SUITE_TKIP:
268 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
269 if ((pairwise && key_idx) ||
270 params->mode != NL80211_KEY_RX_TX)
273 case WLAN_CIPHER_SUITE_CCMP:
274 case WLAN_CIPHER_SUITE_CCMP_256:
275 case WLAN_CIPHER_SUITE_GCMP:
276 case WLAN_CIPHER_SUITE_GCMP_256:
277 /* IEEE802.11-2016 allows only 0 and - when supporting
278 * Extended Key ID - 1 as index for pairwise keys.
279 * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
280 * the driver supports Extended Key ID.
281 * @NL80211_KEY_SET_TX can't be set when installing and
284 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
285 params->mode == NL80211_KEY_SET_TX)
287 if (wiphy_ext_feature_isset(&rdev->wiphy,
288 NL80211_EXT_FEATURE_EXT_KEY_ID)) {
289 if (pairwise && (key_idx < 0 || key_idx > 1))
291 } else if (pairwise && key_idx) {
295 case WLAN_CIPHER_SUITE_AES_CMAC:
296 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
297 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
298 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
299 /* Disallow BIP (group-only) cipher as pairwise cipher */
305 case WLAN_CIPHER_SUITE_WEP40:
306 case WLAN_CIPHER_SUITE_WEP104:
313 switch (params->cipher) {
314 case WLAN_CIPHER_SUITE_WEP40:
315 if (params->key_len != WLAN_KEY_LEN_WEP40)
318 case WLAN_CIPHER_SUITE_TKIP:
319 if (params->key_len != WLAN_KEY_LEN_TKIP)
322 case WLAN_CIPHER_SUITE_CCMP:
323 if (params->key_len != WLAN_KEY_LEN_CCMP)
326 case WLAN_CIPHER_SUITE_CCMP_256:
327 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
330 case WLAN_CIPHER_SUITE_GCMP:
331 if (params->key_len != WLAN_KEY_LEN_GCMP)
334 case WLAN_CIPHER_SUITE_GCMP_256:
335 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
338 case WLAN_CIPHER_SUITE_WEP104:
339 if (params->key_len != WLAN_KEY_LEN_WEP104)
342 case WLAN_CIPHER_SUITE_AES_CMAC:
343 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
346 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
347 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
350 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
351 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
354 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
355 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
360 * We don't know anything about this algorithm,
361 * allow using it -- but the driver must check
362 * all parameters! We still check below whether
363 * or not the driver supports this algorithm,
370 switch (params->cipher) {
371 case WLAN_CIPHER_SUITE_WEP40:
372 case WLAN_CIPHER_SUITE_WEP104:
373 /* These ciphers do not use key sequence */
375 case WLAN_CIPHER_SUITE_TKIP:
376 case WLAN_CIPHER_SUITE_CCMP:
377 case WLAN_CIPHER_SUITE_CCMP_256:
378 case WLAN_CIPHER_SUITE_GCMP:
379 case WLAN_CIPHER_SUITE_GCMP_256:
380 case WLAN_CIPHER_SUITE_AES_CMAC:
381 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
382 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
383 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
384 if (params->seq_len != 6)
390 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
396 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
398 unsigned int hdrlen = 24;
400 if (ieee80211_is_data(fc)) {
401 if (ieee80211_has_a4(fc))
403 if (ieee80211_is_data_qos(fc)) {
404 hdrlen += IEEE80211_QOS_CTL_LEN;
405 if (ieee80211_has_order(fc))
406 hdrlen += IEEE80211_HT_CTL_LEN;
411 if (ieee80211_is_mgmt(fc)) {
412 if (ieee80211_has_order(fc))
413 hdrlen += IEEE80211_HT_CTL_LEN;
417 if (ieee80211_is_ctl(fc)) {
419 * ACK and CTS are 10 bytes, all others 16. To see how
420 * to get this condition consider
421 * subtype mask: 0b0000000011110000 (0x00F0)
422 * ACK subtype: 0b0000000011010000 (0x00D0)
423 * CTS subtype: 0b0000000011000000 (0x00C0)
424 * bits that matter: ^^^ (0x00E0)
425 * value of those: 0b0000000011000000 (0x00C0)
427 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
435 EXPORT_SYMBOL(ieee80211_hdrlen);
437 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
439 const struct ieee80211_hdr *hdr =
440 (const struct ieee80211_hdr *)skb->data;
443 if (unlikely(skb->len < 10))
445 hdrlen = ieee80211_hdrlen(hdr->frame_control);
446 if (unlikely(hdrlen > skb->len))
450 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
452 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
454 int ae = flags & MESH_FLAGS_AE;
455 /* 802.11-2012, 8.2.4.7.3 */
460 case MESH_FLAGS_AE_A4:
462 case MESH_FLAGS_AE_A5_A6:
467 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
469 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
471 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
473 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
474 const u8 *addr, enum nl80211_iftype iftype,
477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
479 u8 hdr[ETH_ALEN] __aligned(2);
486 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
489 hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
490 if (skb->len < hdrlen + 8)
493 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
495 * IEEE 802.11 address fields:
496 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
497 * 0 0 DA SA BSSID n/a
498 * 0 1 DA BSSID SA n/a
499 * 1 0 BSSID SA DA n/a
502 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
503 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
505 if (iftype == NL80211_IFTYPE_MESH_POINT)
506 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
508 mesh_flags &= MESH_FLAGS_AE;
510 switch (hdr->frame_control &
511 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
512 case cpu_to_le16(IEEE80211_FCTL_TODS):
513 if (unlikely(iftype != NL80211_IFTYPE_AP &&
514 iftype != NL80211_IFTYPE_AP_VLAN &&
515 iftype != NL80211_IFTYPE_P2P_GO))
518 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
519 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
520 iftype != NL80211_IFTYPE_MESH_POINT &&
521 iftype != NL80211_IFTYPE_AP_VLAN &&
522 iftype != NL80211_IFTYPE_STATION))
524 if (iftype == NL80211_IFTYPE_MESH_POINT) {
525 if (mesh_flags == MESH_FLAGS_AE_A4)
527 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
528 skb_copy_bits(skb, hdrlen +
529 offsetof(struct ieee80211s_hdr, eaddr1),
530 tmp.h_dest, 2 * ETH_ALEN);
532 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
535 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
536 if ((iftype != NL80211_IFTYPE_STATION &&
537 iftype != NL80211_IFTYPE_P2P_CLIENT &&
538 iftype != NL80211_IFTYPE_MESH_POINT) ||
539 (is_multicast_ether_addr(tmp.h_dest) &&
540 ether_addr_equal(tmp.h_source, addr)))
542 if (iftype == NL80211_IFTYPE_MESH_POINT) {
543 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
545 if (mesh_flags == MESH_FLAGS_AE_A4)
546 skb_copy_bits(skb, hdrlen +
547 offsetof(struct ieee80211s_hdr, eaddr1),
548 tmp.h_source, ETH_ALEN);
549 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
553 if (iftype != NL80211_IFTYPE_ADHOC &&
554 iftype != NL80211_IFTYPE_STATION &&
555 iftype != NL80211_IFTYPE_OCB)
560 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
561 tmp.h_proto = payload.proto;
563 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
564 tmp.h_proto != htons(ETH_P_AARP) &&
565 tmp.h_proto != htons(ETH_P_IPX)) ||
566 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
567 /* remove RFC1042 or Bridge-Tunnel encapsulation and
568 * replace EtherType */
569 hdrlen += ETH_ALEN + 2;
571 tmp.h_proto = htons(skb->len - hdrlen);
573 pskb_pull(skb, hdrlen);
576 ehdr = skb_push(skb, sizeof(struct ethhdr));
577 memcpy(ehdr, &tmp, sizeof(tmp));
581 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
584 __frame_add_frag(struct sk_buff *skb, struct page *page,
585 void *ptr, int len, int size)
587 struct skb_shared_info *sh = skb_shinfo(skb);
591 page_offset = ptr - page_address(page);
592 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
596 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
599 struct skb_shared_info *sh = skb_shinfo(skb);
600 const skb_frag_t *frag = &sh->frags[0];
601 struct page *frag_page;
603 int frag_len, frag_size;
604 int head_size = skb->len - skb->data_len;
607 frag_page = virt_to_head_page(skb->head);
608 frag_ptr = skb->data;
609 frag_size = head_size;
611 while (offset >= frag_size) {
613 frag_page = skb_frag_page(frag);
614 frag_ptr = skb_frag_address(frag);
615 frag_size = skb_frag_size(frag);
620 frag_len = frag_size - offset;
622 cur_len = min(len, frag_len);
624 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
628 frag_len = skb_frag_size(frag);
629 cur_len = min(len, frag_len);
630 __frame_add_frag(frame, skb_frag_page(frag),
631 skb_frag_address(frag), cur_len, frag_len);
637 static struct sk_buff *
638 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
639 int offset, int len, bool reuse_frag)
641 struct sk_buff *frame;
644 if (skb->len - offset < len)
648 * When reusing framents, copy some data to the head to simplify
649 * ethernet header handling and speed up protocol header processing
650 * in the stack later.
653 cur_len = min_t(int, len, 32);
656 * Allocate and reserve two bytes more for payload
657 * alignment since sizeof(struct ethhdr) is 14.
659 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
663 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
664 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
671 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
676 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
677 const u8 *addr, enum nl80211_iftype iftype,
678 const unsigned int extra_headroom,
679 const u8 *check_da, const u8 *check_sa)
681 unsigned int hlen = ALIGN(extra_headroom, 4);
682 struct sk_buff *frame = NULL;
685 int offset = 0, remaining;
687 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
688 bool reuse_skb = false;
692 unsigned int subframe_len;
696 skb_copy_bits(skb, offset, ð, sizeof(eth));
697 len = ntohs(eth.h_proto);
698 subframe_len = sizeof(struct ethhdr) + len;
699 padding = (4 - subframe_len) & 0x3;
701 /* the last MSDU has no padding */
702 remaining = skb->len - offset;
703 if (subframe_len > remaining)
706 offset += sizeof(struct ethhdr);
707 last = remaining <= subframe_len + padding;
709 /* FIXME: should we really accept multicast DA? */
710 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
711 !ether_addr_equal(check_da, eth.h_dest)) ||
712 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
713 offset += len + padding;
717 /* reuse skb for the last subframe */
718 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
719 skb_pull(skb, offset);
723 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
728 offset += len + padding;
731 skb_reset_network_header(frame);
732 frame->dev = skb->dev;
733 frame->priority = skb->priority;
735 payload = frame->data;
736 ethertype = (payload[6] << 8) | payload[7];
737 if (likely((ether_addr_equal(payload, rfc1042_header) &&
738 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
739 ether_addr_equal(payload, bridge_tunnel_header))) {
740 eth.h_proto = htons(ethertype);
741 skb_pull(frame, ETH_ALEN + 2);
744 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
745 __skb_queue_tail(list, frame);
754 __skb_queue_purge(list);
757 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
759 /* Given a data frame determine the 802.1p/1d tag to use. */
760 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
761 struct cfg80211_qos_map *qos_map)
764 unsigned char vlan_priority;
767 /* skb->priority values from 256->263 are magic values to
768 * directly indicate a specific 802.1d priority. This is used
769 * to allow 802.1d priority to be passed directly in from VLAN
772 if (skb->priority >= 256 && skb->priority <= 263) {
773 ret = skb->priority - 256;
777 if (skb_vlan_tag_present(skb)) {
778 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
780 if (vlan_priority > 0) {
786 switch (skb->protocol) {
787 case htons(ETH_P_IP):
788 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
790 case htons(ETH_P_IPV6):
791 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
793 case htons(ETH_P_MPLS_UC):
794 case htons(ETH_P_MPLS_MC): {
795 struct mpls_label mpls_tmp, *mpls;
797 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
798 sizeof(*mpls), &mpls_tmp);
802 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
806 case htons(ETH_P_80221):
807 /* 802.21 is always network control traffic */
814 unsigned int i, tmp_dscp = dscp >> 2;
816 for (i = 0; i < qos_map->num_des; i++) {
817 if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
818 ret = qos_map->dscp_exception[i].up;
823 for (i = 0; i < 8; i++) {
824 if (tmp_dscp >= qos_map->up[i].low &&
825 tmp_dscp <= qos_map->up[i].high) {
834 return array_index_nospec(ret, IEEE80211_NUM_TIDS);
836 EXPORT_SYMBOL(cfg80211_classify8021d);
838 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
840 const struct cfg80211_bss_ies *ies;
842 ies = rcu_dereference(bss->ies);
846 return cfg80211_find_elem(id, ies->data, ies->len);
848 EXPORT_SYMBOL(ieee80211_bss_get_elem);
850 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
852 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
853 struct net_device *dev = wdev->netdev;
856 if (!wdev->connect_keys)
859 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
860 if (!wdev->connect_keys->params[i].cipher)
862 if (rdev_add_key(rdev, dev, i, false, NULL,
863 &wdev->connect_keys->params[i])) {
864 netdev_err(dev, "failed to set key %d\n", i);
867 if (wdev->connect_keys->def == i &&
868 rdev_set_default_key(rdev, dev, i, true, true)) {
869 netdev_err(dev, "failed to set defkey %d\n", i);
874 kfree_sensitive(wdev->connect_keys);
875 wdev->connect_keys = NULL;
878 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
880 struct cfg80211_event *ev;
883 spin_lock_irqsave(&wdev->event_lock, flags);
884 while (!list_empty(&wdev->event_list)) {
885 ev = list_first_entry(&wdev->event_list,
886 struct cfg80211_event, list);
888 spin_unlock_irqrestore(&wdev->event_lock, flags);
892 case EVENT_CONNECT_RESULT:
893 __cfg80211_connect_result(
896 ev->cr.status == WLAN_STATUS_SUCCESS);
899 __cfg80211_roamed(wdev, &ev->rm);
901 case EVENT_DISCONNECTED:
902 __cfg80211_disconnected(wdev->netdev,
903 ev->dc.ie, ev->dc.ie_len,
905 !ev->dc.locally_generated);
907 case EVENT_IBSS_JOINED:
908 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
912 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
914 case EVENT_PORT_AUTHORIZED:
915 __cfg80211_port_authorized(wdev, ev->pa.bssid);
922 spin_lock_irqsave(&wdev->event_lock, flags);
924 spin_unlock_irqrestore(&wdev->event_lock, flags);
927 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
929 struct wireless_dev *wdev;
933 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
934 cfg80211_process_wdev_events(wdev);
937 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
938 struct net_device *dev, enum nl80211_iftype ntype,
939 struct vif_params *params)
942 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
946 /* don't support changing VLANs, you just re-create them */
947 if (otype == NL80211_IFTYPE_AP_VLAN)
950 /* cannot change into P2P device or NAN */
951 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
952 ntype == NL80211_IFTYPE_NAN)
955 if (!rdev->ops->change_virtual_intf ||
956 !(rdev->wiphy.interface_modes & (1 << ntype)))
959 /* if it's part of a bridge, reject changing type to station/ibss */
960 if (netif_is_bridge_port(dev) &&
961 (ntype == NL80211_IFTYPE_ADHOC ||
962 ntype == NL80211_IFTYPE_STATION ||
963 ntype == NL80211_IFTYPE_P2P_CLIENT))
966 if (ntype != otype) {
967 dev->ieee80211_ptr->use_4addr = false;
968 dev->ieee80211_ptr->mesh_id_up_len = 0;
969 wdev_lock(dev->ieee80211_ptr);
970 rdev_set_qos_map(rdev, dev, NULL);
971 wdev_unlock(dev->ieee80211_ptr);
974 case NL80211_IFTYPE_AP:
975 cfg80211_stop_ap(rdev, dev, true);
977 case NL80211_IFTYPE_ADHOC:
978 cfg80211_leave_ibss(rdev, dev, false);
980 case NL80211_IFTYPE_STATION:
981 case NL80211_IFTYPE_P2P_CLIENT:
982 wdev_lock(dev->ieee80211_ptr);
983 cfg80211_disconnect(rdev, dev,
984 WLAN_REASON_DEAUTH_LEAVING, true);
985 wdev_unlock(dev->ieee80211_ptr);
987 case NL80211_IFTYPE_MESH_POINT:
988 /* mesh should be handled? */
994 cfg80211_process_rdev_events(rdev);
995 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
998 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1000 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1002 if (!err && params && params->use_4addr != -1)
1003 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1006 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1008 case NL80211_IFTYPE_STATION:
1009 if (dev->ieee80211_ptr->use_4addr)
1012 case NL80211_IFTYPE_OCB:
1013 case NL80211_IFTYPE_P2P_CLIENT:
1014 case NL80211_IFTYPE_ADHOC:
1015 dev->priv_flags |= IFF_DONT_BRIDGE;
1017 case NL80211_IFTYPE_P2P_GO:
1018 case NL80211_IFTYPE_AP:
1019 case NL80211_IFTYPE_AP_VLAN:
1020 case NL80211_IFTYPE_WDS:
1021 case NL80211_IFTYPE_MESH_POINT:
1024 case NL80211_IFTYPE_MONITOR:
1025 /* monitor can't bridge anyway */
1027 case NL80211_IFTYPE_UNSPECIFIED:
1028 case NUM_NL80211_IFTYPES:
1031 case NL80211_IFTYPE_P2P_DEVICE:
1032 case NL80211_IFTYPE_NAN:
1038 if (!err && ntype != otype && netif_running(dev)) {
1039 cfg80211_update_iface_num(rdev, ntype, 1);
1040 cfg80211_update_iface_num(rdev, otype, -1);
1046 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1048 int modulation, streams, bitrate;
1050 /* the formula below does only work for MCS values smaller than 32 */
1051 if (WARN_ON_ONCE(rate->mcs >= 32))
1054 modulation = rate->mcs & 7;
1055 streams = (rate->mcs >> 3) + 1;
1057 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1060 bitrate *= (modulation + 1);
1061 else if (modulation == 4)
1062 bitrate *= (modulation + 2);
1064 bitrate *= (modulation + 3);
1068 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1069 bitrate = (bitrate / 9) * 10;
1071 /* do NOT round down here */
1072 return (bitrate + 50000) / 100000;
1075 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1077 static const u32 __mcs2bitrate[] = {
1085 [5] = 12512, /* 1251.25 mbps */
1095 [14] = 8662, /* 866.25 mbps */
1105 [24] = 67568, /* 6756.75 mbps */
1116 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1119 return __mcs2bitrate[rate->mcs];
1122 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1124 static const u32 __mcs2bitrate[] = {
1132 [5] = 12512, /* 1251.25 mbps */
1150 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1153 return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1156 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1158 static const u32 base[4][10] = {
1168 /* not in the spec, but some devices use this: */
1212 case RATE_INFO_BW_160:
1215 case RATE_INFO_BW_80:
1218 case RATE_INFO_BW_40:
1221 case RATE_INFO_BW_5:
1222 case RATE_INFO_BW_10:
1225 case RATE_INFO_BW_20:
1229 bitrate = base[idx][rate->mcs];
1230 bitrate *= rate->nss;
1232 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1233 bitrate = (bitrate / 9) * 10;
1235 /* do NOT round down here */
1236 return (bitrate + 50000) / 100000;
1238 WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1239 rate->bw, rate->mcs, rate->nss);
1243 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1246 u16 mcs_divisors[12] = {
1247 34133, /* 16.666666... */
1248 17067, /* 8.333333... */
1249 11378, /* 5.555555... */
1250 8533, /* 4.166666... */
1251 5689, /* 2.777777... */
1252 4267, /* 2.083333... */
1253 3923, /* 1.851851... */
1254 3413, /* 1.666666... */
1255 2844, /* 1.388888... */
1256 2560, /* 1.250000... */
1257 2276, /* 1.111111... */
1258 2048, /* 1.000000... */
1260 u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1261 u32 rates_969[3] = { 480388888, 453700000, 408333333 };
1262 u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1263 u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1264 u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1265 u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1266 u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1270 if (WARN_ON_ONCE(rate->mcs > 11))
1273 if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1275 if (WARN_ON_ONCE(rate->he_ru_alloc >
1276 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1278 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1281 if (rate->bw == RATE_INFO_BW_160)
1282 result = rates_160M[rate->he_gi];
1283 else if (rate->bw == RATE_INFO_BW_80 ||
1284 (rate->bw == RATE_INFO_BW_HE_RU &&
1285 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1286 result = rates_969[rate->he_gi];
1287 else if (rate->bw == RATE_INFO_BW_40 ||
1288 (rate->bw == RATE_INFO_BW_HE_RU &&
1289 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1290 result = rates_484[rate->he_gi];
1291 else if (rate->bw == RATE_INFO_BW_20 ||
1292 (rate->bw == RATE_INFO_BW_HE_RU &&
1293 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1294 result = rates_242[rate->he_gi];
1295 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1296 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1297 result = rates_106[rate->he_gi];
1298 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1299 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1300 result = rates_52[rate->he_gi];
1301 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1302 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1303 result = rates_26[rate->he_gi];
1305 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1306 rate->bw, rate->he_ru_alloc);
1310 /* now scale to the appropriate MCS */
1313 do_div(tmp, mcs_divisors[rate->mcs]);
1316 /* and take NSS, DCM into account */
1317 result = (result * rate->nss) / 8;
1321 return result / 10000;
1324 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1326 if (rate->flags & RATE_INFO_FLAGS_MCS)
1327 return cfg80211_calculate_bitrate_ht(rate);
1328 if (rate->flags & RATE_INFO_FLAGS_DMG)
1329 return cfg80211_calculate_bitrate_dmg(rate);
1330 if (rate->flags & RATE_INFO_FLAGS_EDMG)
1331 return cfg80211_calculate_bitrate_edmg(rate);
1332 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1333 return cfg80211_calculate_bitrate_vht(rate);
1334 if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1335 return cfg80211_calculate_bitrate_he(rate);
1337 return rate->legacy;
1339 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1341 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1342 enum ieee80211_p2p_attr_id attr,
1343 u8 *buf, unsigned int bufsize)
1346 u16 attr_remaining = 0;
1347 bool desired_attr = false;
1348 u16 desired_len = 0;
1351 unsigned int iedatalen;
1358 if (iedatalen + 2 > len)
1361 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1369 /* check WFA OUI, P2P subtype */
1370 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1371 iedata[2] != 0x9a || iedata[3] != 0x09)
1377 /* check attribute continuation into this IE */
1378 copy = min_t(unsigned int, attr_remaining, iedatalen);
1379 if (copy && desired_attr) {
1380 desired_len += copy;
1382 memcpy(out, iedata, min(bufsize, copy));
1383 out += min(bufsize, copy);
1384 bufsize -= min(bufsize, copy);
1388 if (copy == attr_remaining)
1392 attr_remaining -= copy;
1399 while (iedatalen > 0) {
1402 /* P2P attribute ID & size must fit */
1405 desired_attr = iedata[0] == attr;
1406 attr_len = get_unaligned_le16(iedata + 1);
1410 copy = min_t(unsigned int, attr_len, iedatalen);
1413 desired_len += copy;
1415 memcpy(out, iedata, min(bufsize, copy));
1416 out += min(bufsize, copy);
1417 bufsize -= min(bufsize, copy);
1420 if (copy == attr_len)
1426 attr_remaining = attr_len - copy;
1434 if (attr_remaining && desired_attr)
1439 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1441 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1445 /* Make sure array values are legal */
1446 if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1451 if (ids[i] == WLAN_EID_EXTENSION) {
1452 if (id_ext && (ids[i + 1] == id))
1459 if (ids[i] == id && !id_ext)
1467 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1469 /* we assume a validly formed IEs buffer */
1470 u8 len = ies[pos + 1];
1474 /* the IE itself must have 255 bytes for fragments to follow */
1478 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1486 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1487 const u8 *ids, int n_ids,
1488 const u8 *after_ric, int n_after_ric,
1491 size_t pos = offset;
1493 while (pos < ielen) {
1496 if (ies[pos] == WLAN_EID_EXTENSION)
1498 if ((pos + ext) >= ielen)
1501 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1502 ies[pos] == WLAN_EID_EXTENSION))
1505 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1506 pos = skip_ie(ies, ielen, pos);
1508 while (pos < ielen) {
1509 if (ies[pos] == WLAN_EID_EXTENSION)
1514 if ((pos + ext) >= ielen)
1517 if (!ieee80211_id_in_list(after_ric,
1521 pos = skip_ie(ies, ielen, pos);
1526 pos = skip_ie(ies, ielen, pos);
1532 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1534 bool ieee80211_operating_class_to_band(u8 operating_class,
1535 enum nl80211_band *band)
1537 switch (operating_class) {
1541 *band = NL80211_BAND_5GHZ;
1544 *band = NL80211_BAND_6GHZ;
1550 *band = NL80211_BAND_2GHZ;
1553 *band = NL80211_BAND_60GHZ;
1559 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1561 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1565 u32 freq = chandef->center_freq1;
1567 if (freq >= 2412 && freq <= 2472) {
1568 if (chandef->width > NL80211_CHAN_WIDTH_40)
1571 /* 2.407 GHz, channels 1..13 */
1572 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1573 if (freq > chandef->chan->center_freq)
1574 *op_class = 83; /* HT40+ */
1576 *op_class = 84; /* HT40- */
1585 /* channel 14 is only for IEEE 802.11b */
1586 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1589 *op_class = 82; /* channel 14 */
1593 switch (chandef->width) {
1594 case NL80211_CHAN_WIDTH_80:
1597 case NL80211_CHAN_WIDTH_160:
1600 case NL80211_CHAN_WIDTH_80P80:
1603 case NL80211_CHAN_WIDTH_10:
1604 case NL80211_CHAN_WIDTH_5:
1605 return false; /* unsupported for now */
1611 /* 5 GHz, channels 36..48 */
1612 if (freq >= 5180 && freq <= 5240) {
1614 *op_class = vht_opclass;
1615 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1616 if (freq > chandef->chan->center_freq)
1627 /* 5 GHz, channels 52..64 */
1628 if (freq >= 5260 && freq <= 5320) {
1630 *op_class = vht_opclass;
1631 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1632 if (freq > chandef->chan->center_freq)
1643 /* 5 GHz, channels 100..144 */
1644 if (freq >= 5500 && freq <= 5720) {
1646 *op_class = vht_opclass;
1647 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1648 if (freq > chandef->chan->center_freq)
1659 /* 5 GHz, channels 149..169 */
1660 if (freq >= 5745 && freq <= 5845) {
1662 *op_class = vht_opclass;
1663 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1664 if (freq > chandef->chan->center_freq)
1668 } else if (freq <= 5805) {
1677 /* 56.16 GHz, channel 1..4 */
1678 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1679 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1686 /* not supported yet */
1689 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1691 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1692 u32 *beacon_int_gcd,
1693 bool *beacon_int_different)
1695 struct wireless_dev *wdev;
1697 *beacon_int_gcd = 0;
1698 *beacon_int_different = false;
1700 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1701 if (!wdev->beacon_interval)
1704 if (!*beacon_int_gcd) {
1705 *beacon_int_gcd = wdev->beacon_interval;
1709 if (wdev->beacon_interval == *beacon_int_gcd)
1712 *beacon_int_different = true;
1713 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1716 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1717 if (*beacon_int_gcd)
1718 *beacon_int_different = true;
1719 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1723 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1724 enum nl80211_iftype iftype, u32 beacon_int)
1727 * This is just a basic pre-condition check; if interface combinations
1728 * are possible the driver must already be checking those with a call
1729 * to cfg80211_check_combinations(), in which case we'll validate more
1730 * through the cfg80211_calculate_bi_data() call and code in
1731 * cfg80211_iter_combinations().
1734 if (beacon_int < 10 || beacon_int > 10000)
1740 int cfg80211_iter_combinations(struct wiphy *wiphy,
1741 struct iface_combination_params *params,
1742 void (*iter)(const struct ieee80211_iface_combination *c,
1746 const struct ieee80211_regdomain *regdom;
1747 enum nl80211_dfs_regions region = 0;
1749 int num_interfaces = 0;
1750 u32 used_iftypes = 0;
1752 bool beacon_int_different;
1755 * This is a bit strange, since the iteration used to rely only on
1756 * the data given by the driver, but here it now relies on context,
1757 * in form of the currently operating interfaces.
1758 * This is OK for all current users, and saves us from having to
1759 * push the GCD calculations into all the drivers.
1760 * In the future, this should probably rely more on data that's in
1761 * cfg80211 already - the only thing not would appear to be any new
1762 * interfaces (while being brought up) and channel/radar data.
1764 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1765 &beacon_int_gcd, &beacon_int_different);
1767 if (params->radar_detect) {
1769 regdom = rcu_dereference(cfg80211_regdomain);
1771 region = regdom->dfs_region;
1775 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1776 num_interfaces += params->iftype_num[iftype];
1777 if (params->iftype_num[iftype] > 0 &&
1778 !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1779 used_iftypes |= BIT(iftype);
1782 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1783 const struct ieee80211_iface_combination *c;
1784 struct ieee80211_iface_limit *limits;
1785 u32 all_iftypes = 0;
1787 c = &wiphy->iface_combinations[i];
1789 if (num_interfaces > c->max_interfaces)
1791 if (params->num_different_channels > c->num_different_channels)
1794 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1799 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1800 if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1802 for (j = 0; j < c->n_limits; j++) {
1803 all_iftypes |= limits[j].types;
1804 if (!(limits[j].types & BIT(iftype)))
1806 if (limits[j].max < params->iftype_num[iftype])
1808 limits[j].max -= params->iftype_num[iftype];
1812 if (params->radar_detect !=
1813 (c->radar_detect_widths & params->radar_detect))
1816 if (params->radar_detect && c->radar_detect_regions &&
1817 !(c->radar_detect_regions & BIT(region)))
1820 /* Finally check that all iftypes that we're currently
1821 * using are actually part of this combination. If they
1822 * aren't then we can't use this combination and have
1823 * to continue to the next.
1825 if ((all_iftypes & used_iftypes) != used_iftypes)
1828 if (beacon_int_gcd) {
1829 if (c->beacon_int_min_gcd &&
1830 beacon_int_gcd < c->beacon_int_min_gcd)
1832 if (!c->beacon_int_min_gcd && beacon_int_different)
1836 /* This combination covered all interface types and
1837 * supported the requested numbers, so we're good.
1847 EXPORT_SYMBOL(cfg80211_iter_combinations);
1850 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1857 int cfg80211_check_combinations(struct wiphy *wiphy,
1858 struct iface_combination_params *params)
1862 err = cfg80211_iter_combinations(wiphy, params,
1863 cfg80211_iter_sum_ifcombs, &num);
1871 EXPORT_SYMBOL(cfg80211_check_combinations);
1873 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1874 const u8 *rates, unsigned int n_rates,
1882 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1887 for (i = 0; i < n_rates; i++) {
1888 int rate = (rates[i] & 0x7f) * 5;
1891 for (j = 0; j < sband->n_bitrates; j++) {
1892 if (sband->bitrates[j].bitrate == rate) {
1903 * mask must have at least one bit set here since we
1904 * didn't accept a 0-length rates array nor allowed
1905 * entries in the array that didn't exist
1911 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1913 enum nl80211_band band;
1914 unsigned int n_channels = 0;
1916 for (band = 0; band < NUM_NL80211_BANDS; band++)
1917 if (wiphy->bands[band])
1918 n_channels += wiphy->bands[band]->n_channels;
1922 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1924 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1925 struct station_info *sinfo)
1927 struct cfg80211_registered_device *rdev;
1928 struct wireless_dev *wdev;
1930 wdev = dev->ieee80211_ptr;
1934 rdev = wiphy_to_rdev(wdev->wiphy);
1935 if (!rdev->ops->get_station)
1938 memset(sinfo, 0, sizeof(*sinfo));
1940 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1942 EXPORT_SYMBOL(cfg80211_get_station);
1944 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1951 kfree(f->serv_spec_info);
1954 for (i = 0; i < f->num_rx_filters; i++)
1955 kfree(f->rx_filters[i].filter);
1957 for (i = 0; i < f->num_tx_filters; i++)
1958 kfree(f->tx_filters[i].filter);
1960 kfree(f->rx_filters);
1961 kfree(f->tx_filters);
1964 EXPORT_SYMBOL(cfg80211_free_nan_func);
1966 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1967 u32 center_freq_khz, u32 bw_khz)
1969 u32 start_freq_khz, end_freq_khz;
1971 start_freq_khz = center_freq_khz - (bw_khz / 2);
1972 end_freq_khz = center_freq_khz + (bw_khz / 2);
1974 if (start_freq_khz >= freq_range->start_freq_khz &&
1975 end_freq_khz <= freq_range->end_freq_khz)
1981 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1983 sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1984 sizeof(*(sinfo->pertid)),
1991 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1993 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1994 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1995 const unsigned char rfc1042_header[] __aligned(2) =
1996 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1997 EXPORT_SYMBOL(rfc1042_header);
1999 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2000 const unsigned char bridge_tunnel_header[] __aligned(2) =
2001 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2002 EXPORT_SYMBOL(bridge_tunnel_header);
2004 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2005 struct iapp_layer2_update {
2006 u8 da[ETH_ALEN]; /* broadcast */
2007 u8 sa[ETH_ALEN]; /* STA addr */
2015 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2017 struct iapp_layer2_update *msg;
2018 struct sk_buff *skb;
2020 /* Send Level 2 Update Frame to update forwarding tables in layer 2
2023 skb = dev_alloc_skb(sizeof(*msg));
2026 msg = skb_put(skb, sizeof(*msg));
2028 /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2029 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2031 eth_broadcast_addr(msg->da);
2032 ether_addr_copy(msg->sa, addr);
2033 msg->len = htons(6);
2035 msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */
2036 msg->control = 0xaf; /* XID response lsb.1111F101.
2037 * F=0 (no poll command; unsolicited frame) */
2038 msg->xid_info[0] = 0x81; /* XID format identifier */
2039 msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
2040 msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */
2043 skb->protocol = eth_type_trans(skb, dev);
2044 memset(skb->cb, 0, sizeof(skb->cb));
2047 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2049 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2050 enum ieee80211_vht_chanwidth bw,
2051 int mcs, bool ext_nss_bw_capable,
2052 unsigned int max_vht_nss)
2054 u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2057 int i, mcs_encoding;
2062 if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2072 /* find max_vht_nss for the given MCS */
2073 for (i = 7; i >= 0; i--) {
2074 int supp = (map >> (2 * i)) & 3;
2079 if (supp >= mcs_encoding) {
2080 max_vht_nss = i + 1;
2086 if (!(cap->supp_mcs.tx_mcs_map &
2087 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2090 ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2091 IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2092 supp_width = le32_get_bits(cap->vht_cap_info,
2093 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2095 /* if not capable, treat ext_nss_bw as 0 */
2096 if (!ext_nss_bw_capable)
2099 /* This is invalid */
2100 if (supp_width == 3)
2103 /* This is an invalid combination so pretend nothing is supported */
2104 if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2108 * Cover all the special cases according to IEEE 802.11-2016
2109 * Table 9-250. All other cases are either factor of 1 or not
2113 case IEEE80211_VHT_CHANWIDTH_USE_HT:
2114 case IEEE80211_VHT_CHANWIDTH_80MHZ:
2115 if ((supp_width == 1 || supp_width == 2) &&
2117 return 2 * max_vht_nss;
2119 case IEEE80211_VHT_CHANWIDTH_160MHZ:
2120 if (supp_width == 0 &&
2121 (ext_nss_bw == 1 || ext_nss_bw == 2))
2122 return max_vht_nss / 2;
2123 if (supp_width == 0 &&
2125 return (3 * max_vht_nss) / 4;
2126 if (supp_width == 1 &&
2128 return 2 * max_vht_nss;
2130 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2131 if (supp_width == 0 && ext_nss_bw == 1)
2132 return 0; /* not possible */
2133 if (supp_width == 0 &&
2135 return max_vht_nss / 2;
2136 if (supp_width == 0 &&
2138 return (3 * max_vht_nss) / 4;
2139 if (supp_width == 1 &&
2141 return 0; /* not possible */
2142 if (supp_width == 1 &&
2144 return max_vht_nss / 2;
2145 if (supp_width == 1 &&
2147 return (3 * max_vht_nss) / 4;
2151 /* not covered or invalid combination received */
2154 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2156 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2157 bool is_4addr, u8 check_swif)
2160 bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2162 switch (check_swif) {
2164 if (is_vlan && is_4addr)
2165 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2166 return wiphy->interface_modes & BIT(iftype);
2168 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2169 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2170 return wiphy->software_iftypes & BIT(iftype);
2177 EXPORT_SYMBOL(cfg80211_iftype_allowed);