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 < 5925)
127 return (freq - 5000) / 5;
128 else if (freq == 5935)
130 else if (freq <= 45000) /* DMG band lower limit */
131 /* see 802.11ax D6.1 27.3.22.2 */
132 return (freq - 5950) / 5;
133 else if (freq >= 58320 && freq <= 70200)
134 return (freq - 56160) / 2160;
138 EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
140 struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
143 enum nl80211_band band;
144 struct ieee80211_supported_band *sband;
147 for (band = 0; band < NUM_NL80211_BANDS; band++) {
148 sband = wiphy->bands[band];
153 for (i = 0; i < sband->n_channels; i++) {
154 struct ieee80211_channel *chan = &sband->channels[i];
156 if (ieee80211_channel_to_khz(chan) == freq)
163 EXPORT_SYMBOL(ieee80211_get_channel_khz);
165 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
169 switch (sband->band) {
170 case NL80211_BAND_5GHZ:
171 case NL80211_BAND_6GHZ:
173 for (i = 0; i < sband->n_bitrates; i++) {
174 if (sband->bitrates[i].bitrate == 60 ||
175 sband->bitrates[i].bitrate == 120 ||
176 sband->bitrates[i].bitrate == 240) {
177 sband->bitrates[i].flags |=
178 IEEE80211_RATE_MANDATORY_A;
184 case NL80211_BAND_2GHZ:
186 for (i = 0; i < sband->n_bitrates; i++) {
187 switch (sband->bitrates[i].bitrate) {
192 sband->bitrates[i].flags |=
193 IEEE80211_RATE_MANDATORY_B |
194 IEEE80211_RATE_MANDATORY_G;
200 sband->bitrates[i].flags |=
201 IEEE80211_RATE_MANDATORY_G;
205 sband->bitrates[i].flags |=
206 IEEE80211_RATE_ERP_G;
210 WARN_ON(want != 0 && want != 3);
212 case NL80211_BAND_60GHZ:
213 /* check for mandatory HT MCS 1..4 */
214 WARN_ON(!sband->ht_cap.ht_supported);
215 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
217 case NL80211_BAND_S1GHZ:
218 /* Figure 9-589bd: 3 means unsupported, so != 3 means at least
221 WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
223 case NUM_NL80211_BANDS:
230 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
232 enum nl80211_band band;
234 for (band = 0; band < NUM_NL80211_BANDS; band++)
235 if (wiphy->bands[band])
236 set_mandatory_flags_band(wiphy->bands[band]);
239 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
242 for (i = 0; i < wiphy->n_cipher_suites; i++)
243 if (cipher == wiphy->cipher_suites[i])
248 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
249 struct key_params *params, int key_idx,
250 bool pairwise, const u8 *mac_addr)
254 if (wiphy_ext_feature_isset(&rdev->wiphy,
255 NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
256 wiphy_ext_feature_isset(&rdev->wiphy,
257 NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
259 if (key_idx < 0 || key_idx > max_key_idx)
262 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
265 if (pairwise && !mac_addr)
268 switch (params->cipher) {
269 case WLAN_CIPHER_SUITE_TKIP:
270 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
271 if ((pairwise && key_idx) ||
272 params->mode != NL80211_KEY_RX_TX)
275 case WLAN_CIPHER_SUITE_CCMP:
276 case WLAN_CIPHER_SUITE_CCMP_256:
277 case WLAN_CIPHER_SUITE_GCMP:
278 case WLAN_CIPHER_SUITE_GCMP_256:
279 /* IEEE802.11-2016 allows only 0 and - when supporting
280 * Extended Key ID - 1 as index for pairwise keys.
281 * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
282 * the driver supports Extended Key ID.
283 * @NL80211_KEY_SET_TX can't be set when installing and
286 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
287 params->mode == NL80211_KEY_SET_TX)
289 if (wiphy_ext_feature_isset(&rdev->wiphy,
290 NL80211_EXT_FEATURE_EXT_KEY_ID)) {
291 if (pairwise && (key_idx < 0 || key_idx > 1))
293 } else if (pairwise && key_idx) {
297 case WLAN_CIPHER_SUITE_AES_CMAC:
298 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
299 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
300 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
301 /* Disallow BIP (group-only) cipher as pairwise cipher */
307 case WLAN_CIPHER_SUITE_WEP40:
308 case WLAN_CIPHER_SUITE_WEP104:
315 switch (params->cipher) {
316 case WLAN_CIPHER_SUITE_WEP40:
317 if (params->key_len != WLAN_KEY_LEN_WEP40)
320 case WLAN_CIPHER_SUITE_TKIP:
321 if (params->key_len != WLAN_KEY_LEN_TKIP)
324 case WLAN_CIPHER_SUITE_CCMP:
325 if (params->key_len != WLAN_KEY_LEN_CCMP)
328 case WLAN_CIPHER_SUITE_CCMP_256:
329 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
332 case WLAN_CIPHER_SUITE_GCMP:
333 if (params->key_len != WLAN_KEY_LEN_GCMP)
336 case WLAN_CIPHER_SUITE_GCMP_256:
337 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
340 case WLAN_CIPHER_SUITE_WEP104:
341 if (params->key_len != WLAN_KEY_LEN_WEP104)
344 case WLAN_CIPHER_SUITE_AES_CMAC:
345 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
348 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
349 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
352 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
353 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
356 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
357 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
362 * We don't know anything about this algorithm,
363 * allow using it -- but the driver must check
364 * all parameters! We still check below whether
365 * or not the driver supports this algorithm,
372 switch (params->cipher) {
373 case WLAN_CIPHER_SUITE_WEP40:
374 case WLAN_CIPHER_SUITE_WEP104:
375 /* These ciphers do not use key sequence */
377 case WLAN_CIPHER_SUITE_TKIP:
378 case WLAN_CIPHER_SUITE_CCMP:
379 case WLAN_CIPHER_SUITE_CCMP_256:
380 case WLAN_CIPHER_SUITE_GCMP:
381 case WLAN_CIPHER_SUITE_GCMP_256:
382 case WLAN_CIPHER_SUITE_AES_CMAC:
383 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
384 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
385 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
386 if (params->seq_len != 6)
392 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
398 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
400 unsigned int hdrlen = 24;
402 if (ieee80211_is_data(fc)) {
403 if (ieee80211_has_a4(fc))
405 if (ieee80211_is_data_qos(fc)) {
406 hdrlen += IEEE80211_QOS_CTL_LEN;
407 if (ieee80211_has_order(fc))
408 hdrlen += IEEE80211_HT_CTL_LEN;
413 if (ieee80211_is_mgmt(fc)) {
414 if (ieee80211_has_order(fc))
415 hdrlen += IEEE80211_HT_CTL_LEN;
419 if (ieee80211_is_ctl(fc)) {
421 * ACK and CTS are 10 bytes, all others 16. To see how
422 * to get this condition consider
423 * subtype mask: 0b0000000011110000 (0x00F0)
424 * ACK subtype: 0b0000000011010000 (0x00D0)
425 * CTS subtype: 0b0000000011000000 (0x00C0)
426 * bits that matter: ^^^ (0x00E0)
427 * value of those: 0b0000000011000000 (0x00C0)
429 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
437 EXPORT_SYMBOL(ieee80211_hdrlen);
439 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
441 const struct ieee80211_hdr *hdr =
442 (const struct ieee80211_hdr *)skb->data;
445 if (unlikely(skb->len < 10))
447 hdrlen = ieee80211_hdrlen(hdr->frame_control);
448 if (unlikely(hdrlen > skb->len))
452 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
454 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
456 int ae = flags & MESH_FLAGS_AE;
457 /* 802.11-2012, 8.2.4.7.3 */
462 case MESH_FLAGS_AE_A4:
464 case MESH_FLAGS_AE_A5_A6:
469 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
471 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
473 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
475 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
476 const u8 *addr, enum nl80211_iftype iftype,
479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
481 u8 hdr[ETH_ALEN] __aligned(2);
488 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
491 hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
492 if (skb->len < hdrlen + 8)
495 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
497 * IEEE 802.11 address fields:
498 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
499 * 0 0 DA SA BSSID n/a
500 * 0 1 DA BSSID SA n/a
501 * 1 0 BSSID SA DA n/a
504 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
505 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
507 if (iftype == NL80211_IFTYPE_MESH_POINT)
508 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
510 mesh_flags &= MESH_FLAGS_AE;
512 switch (hdr->frame_control &
513 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
514 case cpu_to_le16(IEEE80211_FCTL_TODS):
515 if (unlikely(iftype != NL80211_IFTYPE_AP &&
516 iftype != NL80211_IFTYPE_AP_VLAN &&
517 iftype != NL80211_IFTYPE_P2P_GO))
520 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
521 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
522 iftype != NL80211_IFTYPE_MESH_POINT &&
523 iftype != NL80211_IFTYPE_AP_VLAN &&
524 iftype != NL80211_IFTYPE_STATION))
526 if (iftype == NL80211_IFTYPE_MESH_POINT) {
527 if (mesh_flags == MESH_FLAGS_AE_A4)
529 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
530 skb_copy_bits(skb, hdrlen +
531 offsetof(struct ieee80211s_hdr, eaddr1),
532 tmp.h_dest, 2 * ETH_ALEN);
534 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
537 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
538 if ((iftype != NL80211_IFTYPE_STATION &&
539 iftype != NL80211_IFTYPE_P2P_CLIENT &&
540 iftype != NL80211_IFTYPE_MESH_POINT) ||
541 (is_multicast_ether_addr(tmp.h_dest) &&
542 ether_addr_equal(tmp.h_source, addr)))
544 if (iftype == NL80211_IFTYPE_MESH_POINT) {
545 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
547 if (mesh_flags == MESH_FLAGS_AE_A4)
548 skb_copy_bits(skb, hdrlen +
549 offsetof(struct ieee80211s_hdr, eaddr1),
550 tmp.h_source, ETH_ALEN);
551 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
555 if (iftype != NL80211_IFTYPE_ADHOC &&
556 iftype != NL80211_IFTYPE_STATION &&
557 iftype != NL80211_IFTYPE_OCB)
562 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
563 tmp.h_proto = payload.proto;
565 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
566 tmp.h_proto != htons(ETH_P_AARP) &&
567 tmp.h_proto != htons(ETH_P_IPX)) ||
568 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
569 /* remove RFC1042 or Bridge-Tunnel encapsulation and
570 * replace EtherType */
571 hdrlen += ETH_ALEN + 2;
573 tmp.h_proto = htons(skb->len - hdrlen);
575 pskb_pull(skb, hdrlen);
578 ehdr = skb_push(skb, sizeof(struct ethhdr));
579 memcpy(ehdr, &tmp, sizeof(tmp));
583 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
586 __frame_add_frag(struct sk_buff *skb, struct page *page,
587 void *ptr, int len, int size)
589 struct skb_shared_info *sh = skb_shinfo(skb);
593 page_offset = ptr - page_address(page);
594 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
598 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
601 struct skb_shared_info *sh = skb_shinfo(skb);
602 const skb_frag_t *frag = &sh->frags[0];
603 struct page *frag_page;
605 int frag_len, frag_size;
606 int head_size = skb->len - skb->data_len;
609 frag_page = virt_to_head_page(skb->head);
610 frag_ptr = skb->data;
611 frag_size = head_size;
613 while (offset >= frag_size) {
615 frag_page = skb_frag_page(frag);
616 frag_ptr = skb_frag_address(frag);
617 frag_size = skb_frag_size(frag);
622 frag_len = frag_size - offset;
624 cur_len = min(len, frag_len);
626 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
630 frag_len = skb_frag_size(frag);
631 cur_len = min(len, frag_len);
632 __frame_add_frag(frame, skb_frag_page(frag),
633 skb_frag_address(frag), cur_len, frag_len);
639 static struct sk_buff *
640 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
641 int offset, int len, bool reuse_frag)
643 struct sk_buff *frame;
646 if (skb->len - offset < len)
650 * When reusing framents, copy some data to the head to simplify
651 * ethernet header handling and speed up protocol header processing
652 * in the stack later.
655 cur_len = min_t(int, len, 32);
658 * Allocate and reserve two bytes more for payload
659 * alignment since sizeof(struct ethhdr) is 14.
661 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
665 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
666 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
673 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
678 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
679 const u8 *addr, enum nl80211_iftype iftype,
680 const unsigned int extra_headroom,
681 const u8 *check_da, const u8 *check_sa)
683 unsigned int hlen = ALIGN(extra_headroom, 4);
684 struct sk_buff *frame = NULL;
687 int offset = 0, remaining;
689 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
690 bool reuse_skb = false;
694 unsigned int subframe_len;
698 skb_copy_bits(skb, offset, ð, sizeof(eth));
699 len = ntohs(eth.h_proto);
700 subframe_len = sizeof(struct ethhdr) + len;
701 padding = (4 - subframe_len) & 0x3;
703 /* the last MSDU has no padding */
704 remaining = skb->len - offset;
705 if (subframe_len > remaining)
708 offset += sizeof(struct ethhdr);
709 last = remaining <= subframe_len + padding;
711 /* FIXME: should we really accept multicast DA? */
712 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
713 !ether_addr_equal(check_da, eth.h_dest)) ||
714 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
715 offset += len + padding;
719 /* reuse skb for the last subframe */
720 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
721 skb_pull(skb, offset);
725 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
730 offset += len + padding;
733 skb_reset_network_header(frame);
734 frame->dev = skb->dev;
735 frame->priority = skb->priority;
737 payload = frame->data;
738 ethertype = (payload[6] << 8) | payload[7];
739 if (likely((ether_addr_equal(payload, rfc1042_header) &&
740 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
741 ether_addr_equal(payload, bridge_tunnel_header))) {
742 eth.h_proto = htons(ethertype);
743 skb_pull(frame, ETH_ALEN + 2);
746 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
747 __skb_queue_tail(list, frame);
756 __skb_queue_purge(list);
759 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
761 /* Given a data frame determine the 802.1p/1d tag to use. */
762 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
763 struct cfg80211_qos_map *qos_map)
766 unsigned char vlan_priority;
769 /* skb->priority values from 256->263 are magic values to
770 * directly indicate a specific 802.1d priority. This is used
771 * to allow 802.1d priority to be passed directly in from VLAN
774 if (skb->priority >= 256 && skb->priority <= 263) {
775 ret = skb->priority - 256;
779 if (skb_vlan_tag_present(skb)) {
780 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
782 if (vlan_priority > 0) {
788 switch (skb->protocol) {
789 case htons(ETH_P_IP):
790 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
792 case htons(ETH_P_IPV6):
793 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
795 case htons(ETH_P_MPLS_UC):
796 case htons(ETH_P_MPLS_MC): {
797 struct mpls_label mpls_tmp, *mpls;
799 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
800 sizeof(*mpls), &mpls_tmp);
804 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
808 case htons(ETH_P_80221):
809 /* 802.21 is always network control traffic */
816 unsigned int i, tmp_dscp = dscp >> 2;
818 for (i = 0; i < qos_map->num_des; i++) {
819 if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
820 ret = qos_map->dscp_exception[i].up;
825 for (i = 0; i < 8; i++) {
826 if (tmp_dscp >= qos_map->up[i].low &&
827 tmp_dscp <= qos_map->up[i].high) {
836 return array_index_nospec(ret, IEEE80211_NUM_TIDS);
838 EXPORT_SYMBOL(cfg80211_classify8021d);
840 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
842 const struct cfg80211_bss_ies *ies;
844 ies = rcu_dereference(bss->ies);
848 return cfg80211_find_elem(id, ies->data, ies->len);
850 EXPORT_SYMBOL(ieee80211_bss_get_elem);
852 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
855 struct net_device *dev = wdev->netdev;
858 if (!wdev->connect_keys)
861 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
862 if (!wdev->connect_keys->params[i].cipher)
864 if (rdev_add_key(rdev, dev, i, false, NULL,
865 &wdev->connect_keys->params[i])) {
866 netdev_err(dev, "failed to set key %d\n", i);
869 if (wdev->connect_keys->def == i &&
870 rdev_set_default_key(rdev, dev, i, true, true)) {
871 netdev_err(dev, "failed to set defkey %d\n", i);
876 kfree_sensitive(wdev->connect_keys);
877 wdev->connect_keys = NULL;
880 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
882 struct cfg80211_event *ev;
885 spin_lock_irqsave(&wdev->event_lock, flags);
886 while (!list_empty(&wdev->event_list)) {
887 ev = list_first_entry(&wdev->event_list,
888 struct cfg80211_event, list);
890 spin_unlock_irqrestore(&wdev->event_lock, flags);
894 case EVENT_CONNECT_RESULT:
895 __cfg80211_connect_result(
898 ev->cr.status == WLAN_STATUS_SUCCESS);
901 __cfg80211_roamed(wdev, &ev->rm);
903 case EVENT_DISCONNECTED:
904 __cfg80211_disconnected(wdev->netdev,
905 ev->dc.ie, ev->dc.ie_len,
907 !ev->dc.locally_generated);
909 case EVENT_IBSS_JOINED:
910 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
914 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
916 case EVENT_PORT_AUTHORIZED:
917 __cfg80211_port_authorized(wdev, ev->pa.bssid);
924 spin_lock_irqsave(&wdev->event_lock, flags);
926 spin_unlock_irqrestore(&wdev->event_lock, flags);
929 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
931 struct wireless_dev *wdev;
935 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
936 cfg80211_process_wdev_events(wdev);
939 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
940 struct net_device *dev, enum nl80211_iftype ntype,
941 struct vif_params *params)
944 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
948 /* don't support changing VLANs, you just re-create them */
949 if (otype == NL80211_IFTYPE_AP_VLAN)
952 /* cannot change into P2P device or NAN */
953 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
954 ntype == NL80211_IFTYPE_NAN)
957 if (!rdev->ops->change_virtual_intf ||
958 !(rdev->wiphy.interface_modes & (1 << ntype)))
961 /* if it's part of a bridge, reject changing type to station/ibss */
962 if (netif_is_bridge_port(dev) &&
963 (ntype == NL80211_IFTYPE_ADHOC ||
964 ntype == NL80211_IFTYPE_STATION ||
965 ntype == NL80211_IFTYPE_P2P_CLIENT))
968 if (ntype != otype) {
969 dev->ieee80211_ptr->use_4addr = false;
970 dev->ieee80211_ptr->mesh_id_up_len = 0;
971 wdev_lock(dev->ieee80211_ptr);
972 rdev_set_qos_map(rdev, dev, NULL);
973 wdev_unlock(dev->ieee80211_ptr);
976 case NL80211_IFTYPE_AP:
977 cfg80211_stop_ap(rdev, dev, true);
979 case NL80211_IFTYPE_ADHOC:
980 cfg80211_leave_ibss(rdev, dev, false);
982 case NL80211_IFTYPE_STATION:
983 case NL80211_IFTYPE_P2P_CLIENT:
984 wdev_lock(dev->ieee80211_ptr);
985 cfg80211_disconnect(rdev, dev,
986 WLAN_REASON_DEAUTH_LEAVING, true);
987 wdev_unlock(dev->ieee80211_ptr);
989 case NL80211_IFTYPE_MESH_POINT:
990 /* mesh should be handled? */
996 cfg80211_process_rdev_events(rdev);
997 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1000 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1002 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1004 if (!err && params && params->use_4addr != -1)
1005 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1008 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1010 case NL80211_IFTYPE_STATION:
1011 if (dev->ieee80211_ptr->use_4addr)
1014 case NL80211_IFTYPE_OCB:
1015 case NL80211_IFTYPE_P2P_CLIENT:
1016 case NL80211_IFTYPE_ADHOC:
1017 dev->priv_flags |= IFF_DONT_BRIDGE;
1019 case NL80211_IFTYPE_P2P_GO:
1020 case NL80211_IFTYPE_AP:
1021 case NL80211_IFTYPE_AP_VLAN:
1022 case NL80211_IFTYPE_WDS:
1023 case NL80211_IFTYPE_MESH_POINT:
1026 case NL80211_IFTYPE_MONITOR:
1027 /* monitor can't bridge anyway */
1029 case NL80211_IFTYPE_UNSPECIFIED:
1030 case NUM_NL80211_IFTYPES:
1033 case NL80211_IFTYPE_P2P_DEVICE:
1034 case NL80211_IFTYPE_NAN:
1040 if (!err && ntype != otype && netif_running(dev)) {
1041 cfg80211_update_iface_num(rdev, ntype, 1);
1042 cfg80211_update_iface_num(rdev, otype, -1);
1048 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1050 int modulation, streams, bitrate;
1052 /* the formula below does only work for MCS values smaller than 32 */
1053 if (WARN_ON_ONCE(rate->mcs >= 32))
1056 modulation = rate->mcs & 7;
1057 streams = (rate->mcs >> 3) + 1;
1059 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1062 bitrate *= (modulation + 1);
1063 else if (modulation == 4)
1064 bitrate *= (modulation + 2);
1066 bitrate *= (modulation + 3);
1070 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1071 bitrate = (bitrate / 9) * 10;
1073 /* do NOT round down here */
1074 return (bitrate + 50000) / 100000;
1077 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1079 static const u32 __mcs2bitrate[] = {
1087 [5] = 12512, /* 1251.25 mbps */
1097 [14] = 8662, /* 866.25 mbps */
1107 [24] = 67568, /* 6756.75 mbps */
1118 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1121 return __mcs2bitrate[rate->mcs];
1124 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1126 static const u32 __mcs2bitrate[] = {
1134 [5] = 12512, /* 1251.25 mbps */
1152 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1155 return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1158 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1160 static const u32 base[4][10] = {
1170 /* not in the spec, but some devices use this: */
1214 case RATE_INFO_BW_160:
1217 case RATE_INFO_BW_80:
1220 case RATE_INFO_BW_40:
1223 case RATE_INFO_BW_5:
1224 case RATE_INFO_BW_10:
1227 case RATE_INFO_BW_20:
1231 bitrate = base[idx][rate->mcs];
1232 bitrate *= rate->nss;
1234 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1235 bitrate = (bitrate / 9) * 10;
1237 /* do NOT round down here */
1238 return (bitrate + 50000) / 100000;
1240 WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1241 rate->bw, rate->mcs, rate->nss);
1245 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1248 u16 mcs_divisors[12] = {
1249 34133, /* 16.666666... */
1250 17067, /* 8.333333... */
1251 11378, /* 5.555555... */
1252 8533, /* 4.166666... */
1253 5689, /* 2.777777... */
1254 4267, /* 2.083333... */
1255 3923, /* 1.851851... */
1256 3413, /* 1.666666... */
1257 2844, /* 1.388888... */
1258 2560, /* 1.250000... */
1259 2276, /* 1.111111... */
1260 2048, /* 1.000000... */
1262 u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1263 u32 rates_969[3] = { 480388888, 453700000, 408333333 };
1264 u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1265 u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1266 u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1267 u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1268 u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1272 if (WARN_ON_ONCE(rate->mcs > 11))
1275 if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1277 if (WARN_ON_ONCE(rate->he_ru_alloc >
1278 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1280 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1283 if (rate->bw == RATE_INFO_BW_160)
1284 result = rates_160M[rate->he_gi];
1285 else if (rate->bw == RATE_INFO_BW_80 ||
1286 (rate->bw == RATE_INFO_BW_HE_RU &&
1287 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1288 result = rates_969[rate->he_gi];
1289 else if (rate->bw == RATE_INFO_BW_40 ||
1290 (rate->bw == RATE_INFO_BW_HE_RU &&
1291 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1292 result = rates_484[rate->he_gi];
1293 else if (rate->bw == RATE_INFO_BW_20 ||
1294 (rate->bw == RATE_INFO_BW_HE_RU &&
1295 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1296 result = rates_242[rate->he_gi];
1297 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1298 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1299 result = rates_106[rate->he_gi];
1300 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1301 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1302 result = rates_52[rate->he_gi];
1303 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1304 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1305 result = rates_26[rate->he_gi];
1307 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1308 rate->bw, rate->he_ru_alloc);
1312 /* now scale to the appropriate MCS */
1315 do_div(tmp, mcs_divisors[rate->mcs]);
1318 /* and take NSS, DCM into account */
1319 result = (result * rate->nss) / 8;
1323 return result / 10000;
1326 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1328 if (rate->flags & RATE_INFO_FLAGS_MCS)
1329 return cfg80211_calculate_bitrate_ht(rate);
1330 if (rate->flags & RATE_INFO_FLAGS_DMG)
1331 return cfg80211_calculate_bitrate_dmg(rate);
1332 if (rate->flags & RATE_INFO_FLAGS_EDMG)
1333 return cfg80211_calculate_bitrate_edmg(rate);
1334 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1335 return cfg80211_calculate_bitrate_vht(rate);
1336 if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1337 return cfg80211_calculate_bitrate_he(rate);
1339 return rate->legacy;
1341 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1343 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1344 enum ieee80211_p2p_attr_id attr,
1345 u8 *buf, unsigned int bufsize)
1348 u16 attr_remaining = 0;
1349 bool desired_attr = false;
1350 u16 desired_len = 0;
1353 unsigned int iedatalen;
1360 if (iedatalen + 2 > len)
1363 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1371 /* check WFA OUI, P2P subtype */
1372 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1373 iedata[2] != 0x9a || iedata[3] != 0x09)
1379 /* check attribute continuation into this IE */
1380 copy = min_t(unsigned int, attr_remaining, iedatalen);
1381 if (copy && desired_attr) {
1382 desired_len += copy;
1384 memcpy(out, iedata, min(bufsize, copy));
1385 out += min(bufsize, copy);
1386 bufsize -= min(bufsize, copy);
1390 if (copy == attr_remaining)
1394 attr_remaining -= copy;
1401 while (iedatalen > 0) {
1404 /* P2P attribute ID & size must fit */
1407 desired_attr = iedata[0] == attr;
1408 attr_len = get_unaligned_le16(iedata + 1);
1412 copy = min_t(unsigned int, attr_len, iedatalen);
1415 desired_len += copy;
1417 memcpy(out, iedata, min(bufsize, copy));
1418 out += min(bufsize, copy);
1419 bufsize -= min(bufsize, copy);
1422 if (copy == attr_len)
1428 attr_remaining = attr_len - copy;
1436 if (attr_remaining && desired_attr)
1441 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1443 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1447 /* Make sure array values are legal */
1448 if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1453 if (ids[i] == WLAN_EID_EXTENSION) {
1454 if (id_ext && (ids[i + 1] == id))
1461 if (ids[i] == id && !id_ext)
1469 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1471 /* we assume a validly formed IEs buffer */
1472 u8 len = ies[pos + 1];
1476 /* the IE itself must have 255 bytes for fragments to follow */
1480 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1488 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1489 const u8 *ids, int n_ids,
1490 const u8 *after_ric, int n_after_ric,
1493 size_t pos = offset;
1495 while (pos < ielen) {
1498 if (ies[pos] == WLAN_EID_EXTENSION)
1500 if ((pos + ext) >= ielen)
1503 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1504 ies[pos] == WLAN_EID_EXTENSION))
1507 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1508 pos = skip_ie(ies, ielen, pos);
1510 while (pos < ielen) {
1511 if (ies[pos] == WLAN_EID_EXTENSION)
1516 if ((pos + ext) >= ielen)
1519 if (!ieee80211_id_in_list(after_ric,
1523 pos = skip_ie(ies, ielen, pos);
1528 pos = skip_ie(ies, ielen, pos);
1534 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1536 bool ieee80211_operating_class_to_band(u8 operating_class,
1537 enum nl80211_band *band)
1539 switch (operating_class) {
1543 *band = NL80211_BAND_5GHZ;
1546 *band = NL80211_BAND_6GHZ;
1552 *band = NL80211_BAND_2GHZ;
1555 *band = NL80211_BAND_60GHZ;
1561 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1563 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1567 u32 freq = chandef->center_freq1;
1569 if (freq >= 2412 && freq <= 2472) {
1570 if (chandef->width > NL80211_CHAN_WIDTH_40)
1573 /* 2.407 GHz, channels 1..13 */
1574 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1575 if (freq > chandef->chan->center_freq)
1576 *op_class = 83; /* HT40+ */
1578 *op_class = 84; /* HT40- */
1587 /* channel 14 is only for IEEE 802.11b */
1588 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1591 *op_class = 82; /* channel 14 */
1595 switch (chandef->width) {
1596 case NL80211_CHAN_WIDTH_80:
1599 case NL80211_CHAN_WIDTH_160:
1602 case NL80211_CHAN_WIDTH_80P80:
1605 case NL80211_CHAN_WIDTH_10:
1606 case NL80211_CHAN_WIDTH_5:
1607 return false; /* unsupported for now */
1613 /* 5 GHz, channels 36..48 */
1614 if (freq >= 5180 && freq <= 5240) {
1616 *op_class = vht_opclass;
1617 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1618 if (freq > chandef->chan->center_freq)
1629 /* 5 GHz, channels 52..64 */
1630 if (freq >= 5260 && freq <= 5320) {
1632 *op_class = vht_opclass;
1633 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1634 if (freq > chandef->chan->center_freq)
1645 /* 5 GHz, channels 100..144 */
1646 if (freq >= 5500 && freq <= 5720) {
1648 *op_class = vht_opclass;
1649 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1650 if (freq > chandef->chan->center_freq)
1661 /* 5 GHz, channels 149..169 */
1662 if (freq >= 5745 && freq <= 5845) {
1664 *op_class = vht_opclass;
1665 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1666 if (freq > chandef->chan->center_freq)
1670 } else if (freq <= 5805) {
1679 /* 56.16 GHz, channel 1..4 */
1680 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1681 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1688 /* not supported yet */
1691 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1693 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1694 u32 *beacon_int_gcd,
1695 bool *beacon_int_different)
1697 struct wireless_dev *wdev;
1699 *beacon_int_gcd = 0;
1700 *beacon_int_different = false;
1702 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1703 if (!wdev->beacon_interval)
1706 if (!*beacon_int_gcd) {
1707 *beacon_int_gcd = wdev->beacon_interval;
1711 if (wdev->beacon_interval == *beacon_int_gcd)
1714 *beacon_int_different = true;
1715 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1718 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1719 if (*beacon_int_gcd)
1720 *beacon_int_different = true;
1721 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1725 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1726 enum nl80211_iftype iftype, u32 beacon_int)
1729 * This is just a basic pre-condition check; if interface combinations
1730 * are possible the driver must already be checking those with a call
1731 * to cfg80211_check_combinations(), in which case we'll validate more
1732 * through the cfg80211_calculate_bi_data() call and code in
1733 * cfg80211_iter_combinations().
1736 if (beacon_int < 10 || beacon_int > 10000)
1742 int cfg80211_iter_combinations(struct wiphy *wiphy,
1743 struct iface_combination_params *params,
1744 void (*iter)(const struct ieee80211_iface_combination *c,
1748 const struct ieee80211_regdomain *regdom;
1749 enum nl80211_dfs_regions region = 0;
1751 int num_interfaces = 0;
1752 u32 used_iftypes = 0;
1754 bool beacon_int_different;
1757 * This is a bit strange, since the iteration used to rely only on
1758 * the data given by the driver, but here it now relies on context,
1759 * in form of the currently operating interfaces.
1760 * This is OK for all current users, and saves us from having to
1761 * push the GCD calculations into all the drivers.
1762 * In the future, this should probably rely more on data that's in
1763 * cfg80211 already - the only thing not would appear to be any new
1764 * interfaces (while being brought up) and channel/radar data.
1766 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1767 &beacon_int_gcd, &beacon_int_different);
1769 if (params->radar_detect) {
1771 regdom = rcu_dereference(cfg80211_regdomain);
1773 region = regdom->dfs_region;
1777 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1778 num_interfaces += params->iftype_num[iftype];
1779 if (params->iftype_num[iftype] > 0 &&
1780 !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1781 used_iftypes |= BIT(iftype);
1784 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1785 const struct ieee80211_iface_combination *c;
1786 struct ieee80211_iface_limit *limits;
1787 u32 all_iftypes = 0;
1789 c = &wiphy->iface_combinations[i];
1791 if (num_interfaces > c->max_interfaces)
1793 if (params->num_different_channels > c->num_different_channels)
1796 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1801 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1802 if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1804 for (j = 0; j < c->n_limits; j++) {
1805 all_iftypes |= limits[j].types;
1806 if (!(limits[j].types & BIT(iftype)))
1808 if (limits[j].max < params->iftype_num[iftype])
1810 limits[j].max -= params->iftype_num[iftype];
1814 if (params->radar_detect !=
1815 (c->radar_detect_widths & params->radar_detect))
1818 if (params->radar_detect && c->radar_detect_regions &&
1819 !(c->radar_detect_regions & BIT(region)))
1822 /* Finally check that all iftypes that we're currently
1823 * using are actually part of this combination. If they
1824 * aren't then we can't use this combination and have
1825 * to continue to the next.
1827 if ((all_iftypes & used_iftypes) != used_iftypes)
1830 if (beacon_int_gcd) {
1831 if (c->beacon_int_min_gcd &&
1832 beacon_int_gcd < c->beacon_int_min_gcd)
1834 if (!c->beacon_int_min_gcd && beacon_int_different)
1838 /* This combination covered all interface types and
1839 * supported the requested numbers, so we're good.
1849 EXPORT_SYMBOL(cfg80211_iter_combinations);
1852 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1859 int cfg80211_check_combinations(struct wiphy *wiphy,
1860 struct iface_combination_params *params)
1864 err = cfg80211_iter_combinations(wiphy, params,
1865 cfg80211_iter_sum_ifcombs, &num);
1873 EXPORT_SYMBOL(cfg80211_check_combinations);
1875 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1876 const u8 *rates, unsigned int n_rates,
1884 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1889 for (i = 0; i < n_rates; i++) {
1890 int rate = (rates[i] & 0x7f) * 5;
1893 for (j = 0; j < sband->n_bitrates; j++) {
1894 if (sband->bitrates[j].bitrate == rate) {
1905 * mask must have at least one bit set here since we
1906 * didn't accept a 0-length rates array nor allowed
1907 * entries in the array that didn't exist
1913 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1915 enum nl80211_band band;
1916 unsigned int n_channels = 0;
1918 for (band = 0; band < NUM_NL80211_BANDS; band++)
1919 if (wiphy->bands[band])
1920 n_channels += wiphy->bands[band]->n_channels;
1924 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1926 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1927 struct station_info *sinfo)
1929 struct cfg80211_registered_device *rdev;
1930 struct wireless_dev *wdev;
1932 wdev = dev->ieee80211_ptr;
1936 rdev = wiphy_to_rdev(wdev->wiphy);
1937 if (!rdev->ops->get_station)
1940 memset(sinfo, 0, sizeof(*sinfo));
1942 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1944 EXPORT_SYMBOL(cfg80211_get_station);
1946 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1953 kfree(f->serv_spec_info);
1956 for (i = 0; i < f->num_rx_filters; i++)
1957 kfree(f->rx_filters[i].filter);
1959 for (i = 0; i < f->num_tx_filters; i++)
1960 kfree(f->tx_filters[i].filter);
1962 kfree(f->rx_filters);
1963 kfree(f->tx_filters);
1966 EXPORT_SYMBOL(cfg80211_free_nan_func);
1968 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1969 u32 center_freq_khz, u32 bw_khz)
1971 u32 start_freq_khz, end_freq_khz;
1973 start_freq_khz = center_freq_khz - (bw_khz / 2);
1974 end_freq_khz = center_freq_khz + (bw_khz / 2);
1976 if (start_freq_khz >= freq_range->start_freq_khz &&
1977 end_freq_khz <= freq_range->end_freq_khz)
1983 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1985 sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1986 sizeof(*(sinfo->pertid)),
1993 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1995 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1996 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1997 const unsigned char rfc1042_header[] __aligned(2) =
1998 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1999 EXPORT_SYMBOL(rfc1042_header);
2001 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2002 const unsigned char bridge_tunnel_header[] __aligned(2) =
2003 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2004 EXPORT_SYMBOL(bridge_tunnel_header);
2006 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2007 struct iapp_layer2_update {
2008 u8 da[ETH_ALEN]; /* broadcast */
2009 u8 sa[ETH_ALEN]; /* STA addr */
2017 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2019 struct iapp_layer2_update *msg;
2020 struct sk_buff *skb;
2022 /* Send Level 2 Update Frame to update forwarding tables in layer 2
2025 skb = dev_alloc_skb(sizeof(*msg));
2028 msg = skb_put(skb, sizeof(*msg));
2030 /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2031 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2033 eth_broadcast_addr(msg->da);
2034 ether_addr_copy(msg->sa, addr);
2035 msg->len = htons(6);
2037 msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */
2038 msg->control = 0xaf; /* XID response lsb.1111F101.
2039 * F=0 (no poll command; unsolicited frame) */
2040 msg->xid_info[0] = 0x81; /* XID format identifier */
2041 msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
2042 msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */
2045 skb->protocol = eth_type_trans(skb, dev);
2046 memset(skb->cb, 0, sizeof(skb->cb));
2049 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2051 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2052 enum ieee80211_vht_chanwidth bw,
2053 int mcs, bool ext_nss_bw_capable,
2054 unsigned int max_vht_nss)
2056 u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2059 int i, mcs_encoding;
2064 if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2074 /* find max_vht_nss for the given MCS */
2075 for (i = 7; i >= 0; i--) {
2076 int supp = (map >> (2 * i)) & 3;
2081 if (supp >= mcs_encoding) {
2082 max_vht_nss = i + 1;
2088 if (!(cap->supp_mcs.tx_mcs_map &
2089 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2092 ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2093 IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2094 supp_width = le32_get_bits(cap->vht_cap_info,
2095 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2097 /* if not capable, treat ext_nss_bw as 0 */
2098 if (!ext_nss_bw_capable)
2101 /* This is invalid */
2102 if (supp_width == 3)
2105 /* This is an invalid combination so pretend nothing is supported */
2106 if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2110 * Cover all the special cases according to IEEE 802.11-2016
2111 * Table 9-250. All other cases are either factor of 1 or not
2115 case IEEE80211_VHT_CHANWIDTH_USE_HT:
2116 case IEEE80211_VHT_CHANWIDTH_80MHZ:
2117 if ((supp_width == 1 || supp_width == 2) &&
2119 return 2 * max_vht_nss;
2121 case IEEE80211_VHT_CHANWIDTH_160MHZ:
2122 if (supp_width == 0 &&
2123 (ext_nss_bw == 1 || ext_nss_bw == 2))
2124 return max_vht_nss / 2;
2125 if (supp_width == 0 &&
2127 return (3 * max_vht_nss) / 4;
2128 if (supp_width == 1 &&
2130 return 2 * max_vht_nss;
2132 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2133 if (supp_width == 0 && ext_nss_bw == 1)
2134 return 0; /* not possible */
2135 if (supp_width == 0 &&
2137 return max_vht_nss / 2;
2138 if (supp_width == 0 &&
2140 return (3 * max_vht_nss) / 4;
2141 if (supp_width == 1 &&
2143 return 0; /* not possible */
2144 if (supp_width == 1 &&
2146 return max_vht_nss / 2;
2147 if (supp_width == 1 &&
2149 return (3 * max_vht_nss) / 4;
2153 /* not covered or invalid combination received */
2156 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2158 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2159 bool is_4addr, u8 check_swif)
2162 bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2164 switch (check_swif) {
2166 if (is_vlan && is_4addr)
2167 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2168 return wiphy->interface_modes & BIT(iftype);
2170 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2171 return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2172 return wiphy->software_iftypes & BIT(iftype);
2179 EXPORT_SYMBOL(cfg80211_iftype_allowed);