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 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>
26 struct ieee80211_rate *
27 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
28 u32 basic_rates, int bitrate)
30 struct ieee80211_rate *result = &sband->bitrates[0];
33 for (i = 0; i < sband->n_bitrates; i++) {
34 if (!(basic_rates & BIT(i)))
36 if (sband->bitrates[i].bitrate > bitrate)
38 result = &sband->bitrates[i];
43 EXPORT_SYMBOL(ieee80211_get_response_rate);
45 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
46 enum nl80211_bss_scan_width scan_width)
48 struct ieee80211_rate *bitrates;
49 u32 mandatory_rates = 0;
50 enum ieee80211_rate_flags mandatory_flag;
56 if (sband->band == NL80211_BAND_2GHZ) {
57 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
58 scan_width == NL80211_BSS_CHAN_WIDTH_10)
59 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
61 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
63 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
66 bitrates = sband->bitrates;
67 for (i = 0; i < sband->n_bitrates; i++)
68 if (bitrates[i].flags & mandatory_flag)
69 mandatory_rates |= BIT(i);
70 return mandatory_rates;
72 EXPORT_SYMBOL(ieee80211_mandatory_rates);
74 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
76 /* see 802.11 17.3.8.3.2 and Annex J
77 * there are overlapping channel numbers in 5GHz and 2GHz bands */
79 return 0; /* not supported */
81 case NL80211_BAND_2GHZ:
85 return 2407 + chan * 5;
87 case NL80211_BAND_5GHZ:
88 if (chan >= 182 && chan <= 196)
89 return 4000 + chan * 5;
91 return 5000 + chan * 5;
93 case NL80211_BAND_60GHZ:
95 return 56160 + chan * 2160;
100 return 0; /* not supported */
102 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
104 int ieee80211_frequency_to_channel(int freq)
106 /* see 802.11 17.3.8.3.2 and Annex J */
109 else if (freq < 2484)
110 return (freq - 2407) / 5;
111 else if (freq >= 4910 && freq <= 4980)
112 return (freq - 4000) / 5;
113 else if (freq <= 45000) /* DMG band lower limit */
114 return (freq - 5000) / 5;
115 else if (freq >= 58320 && freq <= 70200)
116 return (freq - 56160) / 2160;
120 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
122 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
124 enum nl80211_band band;
125 struct ieee80211_supported_band *sband;
128 for (band = 0; band < NUM_NL80211_BANDS; band++) {
129 sband = wiphy->bands[band];
134 for (i = 0; i < sband->n_channels; i++) {
135 if (sband->channels[i].center_freq == freq)
136 return &sband->channels[i];
142 EXPORT_SYMBOL(ieee80211_get_channel);
144 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
148 switch (sband->band) {
149 case NL80211_BAND_5GHZ:
151 for (i = 0; i < sband->n_bitrates; i++) {
152 if (sband->bitrates[i].bitrate == 60 ||
153 sband->bitrates[i].bitrate == 120 ||
154 sband->bitrates[i].bitrate == 240) {
155 sband->bitrates[i].flags |=
156 IEEE80211_RATE_MANDATORY_A;
162 case NL80211_BAND_2GHZ:
164 for (i = 0; i < sband->n_bitrates; i++) {
165 switch (sband->bitrates[i].bitrate) {
170 sband->bitrates[i].flags |=
171 IEEE80211_RATE_MANDATORY_B |
172 IEEE80211_RATE_MANDATORY_G;
178 sband->bitrates[i].flags |=
179 IEEE80211_RATE_MANDATORY_G;
183 sband->bitrates[i].flags |=
184 IEEE80211_RATE_ERP_G;
188 WARN_ON(want != 0 && want != 3);
190 case NL80211_BAND_60GHZ:
191 /* check for mandatory HT MCS 1..4 */
192 WARN_ON(!sband->ht_cap.ht_supported);
193 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
195 case NUM_NL80211_BANDS:
202 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
204 enum nl80211_band band;
206 for (band = 0; band < NUM_NL80211_BANDS; band++)
207 if (wiphy->bands[band])
208 set_mandatory_flags_band(wiphy->bands[band]);
211 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
214 for (i = 0; i < wiphy->n_cipher_suites; i++)
215 if (cipher == wiphy->cipher_suites[i])
220 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
221 struct key_params *params, int key_idx,
222 bool pairwise, const u8 *mac_addr)
224 if (key_idx < 0 || key_idx > 5)
227 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
230 if (pairwise && !mac_addr)
233 switch (params->cipher) {
234 case WLAN_CIPHER_SUITE_TKIP:
235 case WLAN_CIPHER_SUITE_CCMP:
236 case WLAN_CIPHER_SUITE_CCMP_256:
237 case WLAN_CIPHER_SUITE_GCMP:
238 case WLAN_CIPHER_SUITE_GCMP_256:
239 /* Disallow pairwise keys with non-zero index unless it's WEP
240 * or a vendor specific cipher (because current deployments use
241 * pairwise WEP keys with non-zero indices and for vendor
242 * specific ciphers this should be validated in the driver or
243 * hardware level - but 802.11i clearly specifies to use zero)
245 if (pairwise && key_idx)
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 /* Disallow BIP (group-only) cipher as pairwise cipher */
258 case WLAN_CIPHER_SUITE_WEP40:
259 case WLAN_CIPHER_SUITE_WEP104:
266 switch (params->cipher) {
267 case WLAN_CIPHER_SUITE_WEP40:
268 if (params->key_len != WLAN_KEY_LEN_WEP40)
271 case WLAN_CIPHER_SUITE_TKIP:
272 if (params->key_len != WLAN_KEY_LEN_TKIP)
275 case WLAN_CIPHER_SUITE_CCMP:
276 if (params->key_len != WLAN_KEY_LEN_CCMP)
279 case WLAN_CIPHER_SUITE_CCMP_256:
280 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
283 case WLAN_CIPHER_SUITE_GCMP:
284 if (params->key_len != WLAN_KEY_LEN_GCMP)
287 case WLAN_CIPHER_SUITE_GCMP_256:
288 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
291 case WLAN_CIPHER_SUITE_WEP104:
292 if (params->key_len != WLAN_KEY_LEN_WEP104)
295 case WLAN_CIPHER_SUITE_AES_CMAC:
296 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
299 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
300 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
303 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
304 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
307 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
308 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
313 * We don't know anything about this algorithm,
314 * allow using it -- but the driver must check
315 * all parameters! We still check below whether
316 * or not the driver supports this algorithm,
323 switch (params->cipher) {
324 case WLAN_CIPHER_SUITE_WEP40:
325 case WLAN_CIPHER_SUITE_WEP104:
326 /* These ciphers do not use key sequence */
328 case WLAN_CIPHER_SUITE_TKIP:
329 case WLAN_CIPHER_SUITE_CCMP:
330 case WLAN_CIPHER_SUITE_CCMP_256:
331 case WLAN_CIPHER_SUITE_GCMP:
332 case WLAN_CIPHER_SUITE_GCMP_256:
333 case WLAN_CIPHER_SUITE_AES_CMAC:
334 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
335 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
336 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
337 if (params->seq_len != 6)
343 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
349 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
351 unsigned int hdrlen = 24;
353 if (ieee80211_is_data(fc)) {
354 if (ieee80211_has_a4(fc))
356 if (ieee80211_is_data_qos(fc)) {
357 hdrlen += IEEE80211_QOS_CTL_LEN;
358 if (ieee80211_has_order(fc))
359 hdrlen += IEEE80211_HT_CTL_LEN;
364 if (ieee80211_is_mgmt(fc)) {
365 if (ieee80211_has_order(fc))
366 hdrlen += IEEE80211_HT_CTL_LEN;
370 if (ieee80211_is_ctl(fc)) {
372 * ACK and CTS are 10 bytes, all others 16. To see how
373 * to get this condition consider
374 * subtype mask: 0b0000000011110000 (0x00F0)
375 * ACK subtype: 0b0000000011010000 (0x00D0)
376 * CTS subtype: 0b0000000011000000 (0x00C0)
377 * bits that matter: ^^^ (0x00E0)
378 * value of those: 0b0000000011000000 (0x00C0)
380 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
388 EXPORT_SYMBOL(ieee80211_hdrlen);
390 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
392 const struct ieee80211_hdr *hdr =
393 (const struct ieee80211_hdr *)skb->data;
396 if (unlikely(skb->len < 10))
398 hdrlen = ieee80211_hdrlen(hdr->frame_control);
399 if (unlikely(hdrlen > skb->len))
403 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
405 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
407 int ae = flags & MESH_FLAGS_AE;
408 /* 802.11-2012, 8.2.4.7.3 */
413 case MESH_FLAGS_AE_A4:
415 case MESH_FLAGS_AE_A5_A6:
420 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
422 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
424 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
426 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
427 const u8 *addr, enum nl80211_iftype iftype,
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
432 u8 hdr[ETH_ALEN] __aligned(2);
439 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
442 hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
443 if (skb->len < hdrlen + 8)
446 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
448 * IEEE 802.11 address fields:
449 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
450 * 0 0 DA SA BSSID n/a
451 * 0 1 DA BSSID SA n/a
452 * 1 0 BSSID SA DA n/a
455 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
456 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
458 if (iftype == NL80211_IFTYPE_MESH_POINT)
459 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
461 mesh_flags &= MESH_FLAGS_AE;
463 switch (hdr->frame_control &
464 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
465 case cpu_to_le16(IEEE80211_FCTL_TODS):
466 if (unlikely(iftype != NL80211_IFTYPE_AP &&
467 iftype != NL80211_IFTYPE_AP_VLAN &&
468 iftype != NL80211_IFTYPE_P2P_GO))
471 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
472 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
473 iftype != NL80211_IFTYPE_MESH_POINT &&
474 iftype != NL80211_IFTYPE_AP_VLAN &&
475 iftype != NL80211_IFTYPE_STATION))
477 if (iftype == NL80211_IFTYPE_MESH_POINT) {
478 if (mesh_flags == MESH_FLAGS_AE_A4)
480 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
481 skb_copy_bits(skb, hdrlen +
482 offsetof(struct ieee80211s_hdr, eaddr1),
483 tmp.h_dest, 2 * ETH_ALEN);
485 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
488 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
489 if ((iftype != NL80211_IFTYPE_STATION &&
490 iftype != NL80211_IFTYPE_P2P_CLIENT &&
491 iftype != NL80211_IFTYPE_MESH_POINT) ||
492 (is_multicast_ether_addr(tmp.h_dest) &&
493 ether_addr_equal(tmp.h_source, addr)))
495 if (iftype == NL80211_IFTYPE_MESH_POINT) {
496 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
498 if (mesh_flags == MESH_FLAGS_AE_A4)
499 skb_copy_bits(skb, hdrlen +
500 offsetof(struct ieee80211s_hdr, eaddr1),
501 tmp.h_source, ETH_ALEN);
502 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
506 if (iftype != NL80211_IFTYPE_ADHOC &&
507 iftype != NL80211_IFTYPE_STATION &&
508 iftype != NL80211_IFTYPE_OCB)
513 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
514 tmp.h_proto = payload.proto;
516 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
517 tmp.h_proto != htons(ETH_P_AARP) &&
518 tmp.h_proto != htons(ETH_P_IPX)) ||
519 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
520 /* remove RFC1042 or Bridge-Tunnel encapsulation and
521 * replace EtherType */
522 hdrlen += ETH_ALEN + 2;
524 tmp.h_proto = htons(skb->len - hdrlen);
526 pskb_pull(skb, hdrlen);
529 ehdr = skb_push(skb, sizeof(struct ethhdr));
530 memcpy(ehdr, &tmp, sizeof(tmp));
534 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
537 __frame_add_frag(struct sk_buff *skb, struct page *page,
538 void *ptr, int len, int size)
540 struct skb_shared_info *sh = skb_shinfo(skb);
544 page_offset = ptr - page_address(page);
545 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
549 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
552 struct skb_shared_info *sh = skb_shinfo(skb);
553 const skb_frag_t *frag = &sh->frags[0];
554 struct page *frag_page;
556 int frag_len, frag_size;
557 int head_size = skb->len - skb->data_len;
560 frag_page = virt_to_head_page(skb->head);
561 frag_ptr = skb->data;
562 frag_size = head_size;
564 while (offset >= frag_size) {
566 frag_page = skb_frag_page(frag);
567 frag_ptr = skb_frag_address(frag);
568 frag_size = skb_frag_size(frag);
573 frag_len = frag_size - offset;
575 cur_len = min(len, frag_len);
577 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
581 frag_len = skb_frag_size(frag);
582 cur_len = min(len, frag_len);
583 __frame_add_frag(frame, skb_frag_page(frag),
584 skb_frag_address(frag), cur_len, frag_len);
590 static struct sk_buff *
591 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
592 int offset, int len, bool reuse_frag)
594 struct sk_buff *frame;
597 if (skb->len - offset < len)
601 * When reusing framents, copy some data to the head to simplify
602 * ethernet header handling and speed up protocol header processing
603 * in the stack later.
606 cur_len = min_t(int, len, 32);
609 * Allocate and reserve two bytes more for payload
610 * alignment since sizeof(struct ethhdr) is 14.
612 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
616 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
617 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
624 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
629 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
630 const u8 *addr, enum nl80211_iftype iftype,
631 const unsigned int extra_headroom,
632 const u8 *check_da, const u8 *check_sa)
634 unsigned int hlen = ALIGN(extra_headroom, 4);
635 struct sk_buff *frame = NULL;
638 int offset = 0, remaining;
640 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
641 bool reuse_skb = false;
645 unsigned int subframe_len;
649 skb_copy_bits(skb, offset, ð, sizeof(eth));
650 len = ntohs(eth.h_proto);
651 subframe_len = sizeof(struct ethhdr) + len;
652 padding = (4 - subframe_len) & 0x3;
654 /* the last MSDU has no padding */
655 remaining = skb->len - offset;
656 if (subframe_len > remaining)
659 offset += sizeof(struct ethhdr);
660 last = remaining <= subframe_len + padding;
662 /* FIXME: should we really accept multicast DA? */
663 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
664 !ether_addr_equal(check_da, eth.h_dest)) ||
665 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
666 offset += len + padding;
670 /* reuse skb for the last subframe */
671 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
672 skb_pull(skb, offset);
676 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
681 offset += len + padding;
684 skb_reset_network_header(frame);
685 frame->dev = skb->dev;
686 frame->priority = skb->priority;
688 payload = frame->data;
689 ethertype = (payload[6] << 8) | payload[7];
690 if (likely((ether_addr_equal(payload, rfc1042_header) &&
691 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
692 ether_addr_equal(payload, bridge_tunnel_header))) {
693 eth.h_proto = htons(ethertype);
694 skb_pull(frame, ETH_ALEN + 2);
697 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
698 __skb_queue_tail(list, frame);
707 __skb_queue_purge(list);
710 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
712 /* Given a data frame determine the 802.1p/1d tag to use. */
713 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
714 struct cfg80211_qos_map *qos_map)
717 unsigned char vlan_priority;
719 /* skb->priority values from 256->263 are magic values to
720 * directly indicate a specific 802.1d priority. This is used
721 * to allow 802.1d priority to be passed directly in from VLAN
724 if (skb->priority >= 256 && skb->priority <= 263)
725 return skb->priority - 256;
727 if (skb_vlan_tag_present(skb)) {
728 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
730 if (vlan_priority > 0)
731 return vlan_priority;
734 switch (skb->protocol) {
735 case htons(ETH_P_IP):
736 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
738 case htons(ETH_P_IPV6):
739 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
741 case htons(ETH_P_MPLS_UC):
742 case htons(ETH_P_MPLS_MC): {
743 struct mpls_label mpls_tmp, *mpls;
745 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
746 sizeof(*mpls), &mpls_tmp);
750 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
753 case htons(ETH_P_80221):
754 /* 802.21 is always network control traffic */
761 unsigned int i, tmp_dscp = dscp >> 2;
763 for (i = 0; i < qos_map->num_des; i++) {
764 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
765 return qos_map->dscp_exception[i].up;
768 for (i = 0; i < 8; i++) {
769 if (tmp_dscp >= qos_map->up[i].low &&
770 tmp_dscp <= qos_map->up[i].high)
777 EXPORT_SYMBOL(cfg80211_classify8021d);
779 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
781 const struct cfg80211_bss_ies *ies;
783 ies = rcu_dereference(bss->ies);
787 return cfg80211_find_ie(ie, ies->data, ies->len);
789 EXPORT_SYMBOL(ieee80211_bss_get_ie);
791 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
793 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
794 struct net_device *dev = wdev->netdev;
797 if (!wdev->connect_keys)
800 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
801 if (!wdev->connect_keys->params[i].cipher)
803 if (rdev_add_key(rdev, dev, i, false, NULL,
804 &wdev->connect_keys->params[i])) {
805 netdev_err(dev, "failed to set key %d\n", i);
808 if (wdev->connect_keys->def == i &&
809 rdev_set_default_key(rdev, dev, i, true, true)) {
810 netdev_err(dev, "failed to set defkey %d\n", i);
815 kzfree(wdev->connect_keys);
816 wdev->connect_keys = NULL;
819 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
821 struct cfg80211_event *ev;
824 spin_lock_irqsave(&wdev->event_lock, flags);
825 while (!list_empty(&wdev->event_list)) {
826 ev = list_first_entry(&wdev->event_list,
827 struct cfg80211_event, list);
829 spin_unlock_irqrestore(&wdev->event_lock, flags);
833 case EVENT_CONNECT_RESULT:
834 __cfg80211_connect_result(
837 ev->cr.status == WLAN_STATUS_SUCCESS);
840 __cfg80211_roamed(wdev, &ev->rm);
842 case EVENT_DISCONNECTED:
843 __cfg80211_disconnected(wdev->netdev,
844 ev->dc.ie, ev->dc.ie_len,
846 !ev->dc.locally_generated);
848 case EVENT_IBSS_JOINED:
849 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
853 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
855 case EVENT_PORT_AUTHORIZED:
856 __cfg80211_port_authorized(wdev, ev->pa.bssid);
863 spin_lock_irqsave(&wdev->event_lock, flags);
865 spin_unlock_irqrestore(&wdev->event_lock, flags);
868 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
870 struct wireless_dev *wdev;
874 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
875 cfg80211_process_wdev_events(wdev);
878 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
879 struct net_device *dev, enum nl80211_iftype ntype,
880 struct vif_params *params)
883 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
887 /* don't support changing VLANs, you just re-create them */
888 if (otype == NL80211_IFTYPE_AP_VLAN)
891 /* cannot change into P2P device or NAN */
892 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
893 ntype == NL80211_IFTYPE_NAN)
896 if (!rdev->ops->change_virtual_intf ||
897 !(rdev->wiphy.interface_modes & (1 << ntype)))
900 /* if it's part of a bridge, reject changing type to station/ibss */
901 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
902 (ntype == NL80211_IFTYPE_ADHOC ||
903 ntype == NL80211_IFTYPE_STATION ||
904 ntype == NL80211_IFTYPE_P2P_CLIENT))
907 if (ntype != otype) {
908 dev->ieee80211_ptr->use_4addr = false;
909 dev->ieee80211_ptr->mesh_id_up_len = 0;
910 wdev_lock(dev->ieee80211_ptr);
911 rdev_set_qos_map(rdev, dev, NULL);
912 wdev_unlock(dev->ieee80211_ptr);
915 case NL80211_IFTYPE_AP:
916 cfg80211_stop_ap(rdev, dev, true);
918 case NL80211_IFTYPE_ADHOC:
919 cfg80211_leave_ibss(rdev, dev, false);
921 case NL80211_IFTYPE_STATION:
922 case NL80211_IFTYPE_P2P_CLIENT:
923 wdev_lock(dev->ieee80211_ptr);
924 cfg80211_disconnect(rdev, dev,
925 WLAN_REASON_DEAUTH_LEAVING, true);
926 wdev_unlock(dev->ieee80211_ptr);
928 case NL80211_IFTYPE_MESH_POINT:
929 /* mesh should be handled? */
935 cfg80211_process_rdev_events(rdev);
938 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
940 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
942 if (!err && params && params->use_4addr != -1)
943 dev->ieee80211_ptr->use_4addr = params->use_4addr;
946 dev->priv_flags &= ~IFF_DONT_BRIDGE;
948 case NL80211_IFTYPE_STATION:
949 if (dev->ieee80211_ptr->use_4addr)
952 case NL80211_IFTYPE_OCB:
953 case NL80211_IFTYPE_P2P_CLIENT:
954 case NL80211_IFTYPE_ADHOC:
955 dev->priv_flags |= IFF_DONT_BRIDGE;
957 case NL80211_IFTYPE_P2P_GO:
958 case NL80211_IFTYPE_AP:
959 case NL80211_IFTYPE_AP_VLAN:
960 case NL80211_IFTYPE_WDS:
961 case NL80211_IFTYPE_MESH_POINT:
964 case NL80211_IFTYPE_MONITOR:
965 /* monitor can't bridge anyway */
967 case NL80211_IFTYPE_UNSPECIFIED:
968 case NUM_NL80211_IFTYPES:
971 case NL80211_IFTYPE_P2P_DEVICE:
972 case NL80211_IFTYPE_NAN:
978 if (!err && ntype != otype && netif_running(dev)) {
979 cfg80211_update_iface_num(rdev, ntype, 1);
980 cfg80211_update_iface_num(rdev, otype, -1);
986 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
988 int modulation, streams, bitrate;
990 /* the formula below does only work for MCS values smaller than 32 */
991 if (WARN_ON_ONCE(rate->mcs >= 32))
994 modulation = rate->mcs & 7;
995 streams = (rate->mcs >> 3) + 1;
997 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1000 bitrate *= (modulation + 1);
1001 else if (modulation == 4)
1002 bitrate *= (modulation + 2);
1004 bitrate *= (modulation + 3);
1008 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1009 bitrate = (bitrate / 9) * 10;
1011 /* do NOT round down here */
1012 return (bitrate + 50000) / 100000;
1015 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1017 static const u32 __mcs2bitrate[] = {
1025 [5] = 12512, /* 1251.25 mbps */
1035 [14] = 8662, /* 866.25 mbps */
1045 [24] = 67568, /* 6756.75 mbps */
1056 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1059 return __mcs2bitrate[rate->mcs];
1062 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1064 static const u32 base[4][10] = {
1074 /* not in the spec, but some devices use this: */
1118 case RATE_INFO_BW_160:
1121 case RATE_INFO_BW_80:
1124 case RATE_INFO_BW_40:
1127 case RATE_INFO_BW_5:
1128 case RATE_INFO_BW_10:
1131 case RATE_INFO_BW_20:
1135 bitrate = base[idx][rate->mcs];
1136 bitrate *= rate->nss;
1138 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1139 bitrate = (bitrate / 9) * 10;
1141 /* do NOT round down here */
1142 return (bitrate + 50000) / 100000;
1144 WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1145 rate->bw, rate->mcs, rate->nss);
1149 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1152 u16 mcs_divisors[12] = {
1153 34133, /* 16.666666... */
1154 17067, /* 8.333333... */
1155 11378, /* 5.555555... */
1156 8533, /* 4.166666... */
1157 5689, /* 2.777777... */
1158 4267, /* 2.083333... */
1159 3923, /* 1.851851... */
1160 3413, /* 1.666666... */
1161 2844, /* 1.388888... */
1162 2560, /* 1.250000... */
1163 2276, /* 1.111111... */
1164 2048, /* 1.000000... */
1166 u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1167 u32 rates_969[3] = { 480388888, 453700000, 408333333 };
1168 u32 rates_484[3] = { 229411111, 216666666, 195000000 };
1169 u32 rates_242[3] = { 114711111, 108333333, 97500000 };
1170 u32 rates_106[3] = { 40000000, 37777777, 34000000 };
1171 u32 rates_52[3] = { 18820000, 17777777, 16000000 };
1172 u32 rates_26[3] = { 9411111, 8888888, 8000000 };
1176 if (WARN_ON_ONCE(rate->mcs > 11))
1179 if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1181 if (WARN_ON_ONCE(rate->he_ru_alloc >
1182 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1184 if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1187 if (rate->bw == RATE_INFO_BW_160)
1188 result = rates_160M[rate->he_gi];
1189 else if (rate->bw == RATE_INFO_BW_80 ||
1190 (rate->bw == RATE_INFO_BW_HE_RU &&
1191 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1192 result = rates_969[rate->he_gi];
1193 else if (rate->bw == RATE_INFO_BW_40 ||
1194 (rate->bw == RATE_INFO_BW_HE_RU &&
1195 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1196 result = rates_484[rate->he_gi];
1197 else if (rate->bw == RATE_INFO_BW_20 ||
1198 (rate->bw == RATE_INFO_BW_HE_RU &&
1199 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1200 result = rates_242[rate->he_gi];
1201 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1202 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1203 result = rates_106[rate->he_gi];
1204 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1205 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1206 result = rates_52[rate->he_gi];
1207 else if (rate->bw == RATE_INFO_BW_HE_RU &&
1208 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1209 result = rates_26[rate->he_gi];
1210 else if (WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1211 rate->bw, rate->he_ru_alloc))
1214 /* now scale to the appropriate MCS */
1217 do_div(tmp, mcs_divisors[rate->mcs]);
1220 /* and take NSS, DCM into account */
1221 result = (result * rate->nss) / 8;
1228 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1230 if (rate->flags & RATE_INFO_FLAGS_MCS)
1231 return cfg80211_calculate_bitrate_ht(rate);
1232 if (rate->flags & RATE_INFO_FLAGS_60G)
1233 return cfg80211_calculate_bitrate_60g(rate);
1234 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1235 return cfg80211_calculate_bitrate_vht(rate);
1236 if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1237 return cfg80211_calculate_bitrate_he(rate);
1239 return rate->legacy;
1241 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1243 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1244 enum ieee80211_p2p_attr_id attr,
1245 u8 *buf, unsigned int bufsize)
1248 u16 attr_remaining = 0;
1249 bool desired_attr = false;
1250 u16 desired_len = 0;
1253 unsigned int iedatalen;
1260 if (iedatalen + 2 > len)
1263 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1271 /* check WFA OUI, P2P subtype */
1272 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1273 iedata[2] != 0x9a || iedata[3] != 0x09)
1279 /* check attribute continuation into this IE */
1280 copy = min_t(unsigned int, attr_remaining, iedatalen);
1281 if (copy && desired_attr) {
1282 desired_len += copy;
1284 memcpy(out, iedata, min(bufsize, copy));
1285 out += min(bufsize, copy);
1286 bufsize -= min(bufsize, copy);
1290 if (copy == attr_remaining)
1294 attr_remaining -= copy;
1301 while (iedatalen > 0) {
1304 /* P2P attribute ID & size must fit */
1307 desired_attr = iedata[0] == attr;
1308 attr_len = get_unaligned_le16(iedata + 1);
1312 copy = min_t(unsigned int, attr_len, iedatalen);
1315 desired_len += copy;
1317 memcpy(out, iedata, min(bufsize, copy));
1318 out += min(bufsize, copy);
1319 bufsize -= min(bufsize, copy);
1322 if (copy == attr_len)
1328 attr_remaining = attr_len - copy;
1336 if (attr_remaining && desired_attr)
1341 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1343 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1347 /* Make sure array values are legal */
1348 if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1353 if (ids[i] == WLAN_EID_EXTENSION) {
1354 if (id_ext && (ids[i + 1] == id))
1361 if (ids[i] == id && !id_ext)
1369 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1371 /* we assume a validly formed IEs buffer */
1372 u8 len = ies[pos + 1];
1376 /* the IE itself must have 255 bytes for fragments to follow */
1380 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1388 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1389 const u8 *ids, int n_ids,
1390 const u8 *after_ric, int n_after_ric,
1393 size_t pos = offset;
1395 while (pos < ielen) {
1398 if (ies[pos] == WLAN_EID_EXTENSION)
1400 if ((pos + ext) >= ielen)
1403 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1404 ies[pos] == WLAN_EID_EXTENSION))
1407 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1408 pos = skip_ie(ies, ielen, pos);
1410 while (pos < ielen) {
1411 if (ies[pos] == WLAN_EID_EXTENSION)
1416 if ((pos + ext) >= ielen)
1419 if (!ieee80211_id_in_list(after_ric,
1423 pos = skip_ie(ies, ielen, pos);
1426 pos = skip_ie(ies, ielen, pos);
1432 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1434 bool ieee80211_operating_class_to_band(u8 operating_class,
1435 enum nl80211_band *band)
1437 switch (operating_class) {
1441 *band = NL80211_BAND_5GHZ;
1447 *band = NL80211_BAND_2GHZ;
1450 *band = NL80211_BAND_60GHZ;
1456 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1458 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1462 u32 freq = chandef->center_freq1;
1464 if (freq >= 2412 && freq <= 2472) {
1465 if (chandef->width > NL80211_CHAN_WIDTH_40)
1468 /* 2.407 GHz, channels 1..13 */
1469 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1470 if (freq > chandef->chan->center_freq)
1471 *op_class = 83; /* HT40+ */
1473 *op_class = 84; /* HT40- */
1482 if (chandef->width > NL80211_CHAN_WIDTH_40)
1485 *op_class = 82; /* channel 14 */
1489 switch (chandef->width) {
1490 case NL80211_CHAN_WIDTH_80:
1493 case NL80211_CHAN_WIDTH_160:
1496 case NL80211_CHAN_WIDTH_80P80:
1499 case NL80211_CHAN_WIDTH_10:
1500 case NL80211_CHAN_WIDTH_5:
1501 return false; /* unsupported for now */
1507 /* 5 GHz, channels 36..48 */
1508 if (freq >= 5180 && freq <= 5240) {
1510 *op_class = vht_opclass;
1511 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1512 if (freq > chandef->chan->center_freq)
1523 /* 5 GHz, channels 52..64 */
1524 if (freq >= 5260 && freq <= 5320) {
1526 *op_class = vht_opclass;
1527 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1528 if (freq > chandef->chan->center_freq)
1539 /* 5 GHz, channels 100..144 */
1540 if (freq >= 5500 && freq <= 5720) {
1542 *op_class = vht_opclass;
1543 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1544 if (freq > chandef->chan->center_freq)
1555 /* 5 GHz, channels 149..169 */
1556 if (freq >= 5745 && freq <= 5845) {
1558 *op_class = vht_opclass;
1559 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1560 if (freq > chandef->chan->center_freq)
1564 } else if (freq <= 5805) {
1573 /* 56.16 GHz, channel 1..4 */
1574 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1575 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1582 /* not supported yet */
1585 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1587 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1588 u32 *beacon_int_gcd,
1589 bool *beacon_int_different)
1591 struct wireless_dev *wdev;
1593 *beacon_int_gcd = 0;
1594 *beacon_int_different = false;
1596 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1597 if (!wdev->beacon_interval)
1600 if (!*beacon_int_gcd) {
1601 *beacon_int_gcd = wdev->beacon_interval;
1605 if (wdev->beacon_interval == *beacon_int_gcd)
1608 *beacon_int_different = true;
1609 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1612 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1613 if (*beacon_int_gcd)
1614 *beacon_int_different = true;
1615 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1619 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1620 enum nl80211_iftype iftype, u32 beacon_int)
1623 * This is just a basic pre-condition check; if interface combinations
1624 * are possible the driver must already be checking those with a call
1625 * to cfg80211_check_combinations(), in which case we'll validate more
1626 * through the cfg80211_calculate_bi_data() call and code in
1627 * cfg80211_iter_combinations().
1630 if (beacon_int < 10 || beacon_int > 10000)
1636 int cfg80211_iter_combinations(struct wiphy *wiphy,
1637 struct iface_combination_params *params,
1638 void (*iter)(const struct ieee80211_iface_combination *c,
1642 const struct ieee80211_regdomain *regdom;
1643 enum nl80211_dfs_regions region = 0;
1645 int num_interfaces = 0;
1646 u32 used_iftypes = 0;
1648 bool beacon_int_different;
1651 * This is a bit strange, since the iteration used to rely only on
1652 * the data given by the driver, but here it now relies on context,
1653 * in form of the currently operating interfaces.
1654 * This is OK for all current users, and saves us from having to
1655 * push the GCD calculations into all the drivers.
1656 * In the future, this should probably rely more on data that's in
1657 * cfg80211 already - the only thing not would appear to be any new
1658 * interfaces (while being brought up) and channel/radar data.
1660 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1661 &beacon_int_gcd, &beacon_int_different);
1663 if (params->radar_detect) {
1665 regdom = rcu_dereference(cfg80211_regdomain);
1667 region = regdom->dfs_region;
1671 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1672 num_interfaces += params->iftype_num[iftype];
1673 if (params->iftype_num[iftype] > 0 &&
1674 !(wiphy->software_iftypes & BIT(iftype)))
1675 used_iftypes |= BIT(iftype);
1678 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1679 const struct ieee80211_iface_combination *c;
1680 struct ieee80211_iface_limit *limits;
1681 u32 all_iftypes = 0;
1683 c = &wiphy->iface_combinations[i];
1685 if (num_interfaces > c->max_interfaces)
1687 if (params->num_different_channels > c->num_different_channels)
1690 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1695 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1696 if (wiphy->software_iftypes & BIT(iftype))
1698 for (j = 0; j < c->n_limits; j++) {
1699 all_iftypes |= limits[j].types;
1700 if (!(limits[j].types & BIT(iftype)))
1702 if (limits[j].max < params->iftype_num[iftype])
1704 limits[j].max -= params->iftype_num[iftype];
1708 if (params->radar_detect !=
1709 (c->radar_detect_widths & params->radar_detect))
1712 if (params->radar_detect && c->radar_detect_regions &&
1713 !(c->radar_detect_regions & BIT(region)))
1716 /* Finally check that all iftypes that we're currently
1717 * using are actually part of this combination. If they
1718 * aren't then we can't use this combination and have
1719 * to continue to the next.
1721 if ((all_iftypes & used_iftypes) != used_iftypes)
1724 if (beacon_int_gcd) {
1725 if (c->beacon_int_min_gcd &&
1726 beacon_int_gcd < c->beacon_int_min_gcd)
1728 if (!c->beacon_int_min_gcd && beacon_int_different)
1732 /* This combination covered all interface types and
1733 * supported the requested numbers, so we're good.
1743 EXPORT_SYMBOL(cfg80211_iter_combinations);
1746 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1753 int cfg80211_check_combinations(struct wiphy *wiphy,
1754 struct iface_combination_params *params)
1758 err = cfg80211_iter_combinations(wiphy, params,
1759 cfg80211_iter_sum_ifcombs, &num);
1767 EXPORT_SYMBOL(cfg80211_check_combinations);
1769 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1770 const u8 *rates, unsigned int n_rates,
1778 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1783 for (i = 0; i < n_rates; i++) {
1784 int rate = (rates[i] & 0x7f) * 5;
1787 for (j = 0; j < sband->n_bitrates; j++) {
1788 if (sband->bitrates[j].bitrate == rate) {
1799 * mask must have at least one bit set here since we
1800 * didn't accept a 0-length rates array nor allowed
1801 * entries in the array that didn't exist
1807 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1809 enum nl80211_band band;
1810 unsigned int n_channels = 0;
1812 for (band = 0; band < NUM_NL80211_BANDS; band++)
1813 if (wiphy->bands[band])
1814 n_channels += wiphy->bands[band]->n_channels;
1818 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1820 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1821 struct station_info *sinfo)
1823 struct cfg80211_registered_device *rdev;
1824 struct wireless_dev *wdev;
1826 wdev = dev->ieee80211_ptr;
1830 rdev = wiphy_to_rdev(wdev->wiphy);
1831 if (!rdev->ops->get_station)
1834 memset(sinfo, 0, sizeof(*sinfo));
1836 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1838 EXPORT_SYMBOL(cfg80211_get_station);
1840 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1847 kfree(f->serv_spec_info);
1850 for (i = 0; i < f->num_rx_filters; i++)
1851 kfree(f->rx_filters[i].filter);
1853 for (i = 0; i < f->num_tx_filters; i++)
1854 kfree(f->tx_filters[i].filter);
1856 kfree(f->rx_filters);
1857 kfree(f->tx_filters);
1860 EXPORT_SYMBOL(cfg80211_free_nan_func);
1862 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1863 u32 center_freq_khz, u32 bw_khz)
1865 u32 start_freq_khz, end_freq_khz;
1867 start_freq_khz = center_freq_khz - (bw_khz / 2);
1868 end_freq_khz = center_freq_khz + (bw_khz / 2);
1870 if (start_freq_khz >= freq_range->start_freq_khz &&
1871 end_freq_khz <= freq_range->end_freq_khz)
1877 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1879 sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1880 sizeof(*(sinfo->pertid)),
1887 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1889 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1890 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1891 const unsigned char rfc1042_header[] __aligned(2) =
1892 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1893 EXPORT_SYMBOL(rfc1042_header);
1895 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1896 const unsigned char bridge_tunnel_header[] __aligned(2) =
1897 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1898 EXPORT_SYMBOL(bridge_tunnel_header);
1900 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
1901 struct iapp_layer2_update {
1902 u8 da[ETH_ALEN]; /* broadcast */
1903 u8 sa[ETH_ALEN]; /* STA addr */
1911 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
1913 struct iapp_layer2_update *msg;
1914 struct sk_buff *skb;
1916 /* Send Level 2 Update Frame to update forwarding tables in layer 2
1919 skb = dev_alloc_skb(sizeof(*msg));
1922 msg = skb_put(skb, sizeof(*msg));
1924 /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
1925 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
1927 eth_broadcast_addr(msg->da);
1928 ether_addr_copy(msg->sa, addr);
1929 msg->len = htons(6);
1931 msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */
1932 msg->control = 0xaf; /* XID response lsb.1111F101.
1933 * F=0 (no poll command; unsolicited frame) */
1934 msg->xid_info[0] = 0x81; /* XID format identifier */
1935 msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
1936 msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */
1939 skb->protocol = eth_type_trans(skb, dev);
1940 memset(skb->cb, 0, sizeof(skb->cb));
1943 EXPORT_SYMBOL(cfg80211_send_layer2_update);
1945 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
1946 enum ieee80211_vht_chanwidth bw,
1947 int mcs, bool ext_nss_bw_capable)
1949 u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
1950 int max_vht_nss = 0;
1953 int i, mcs_encoding;
1958 if (WARN_ON(mcs > 9))
1967 /* find max_vht_nss for the given MCS */
1968 for (i = 7; i >= 0; i--) {
1969 int supp = (map >> (2 * i)) & 3;
1974 if (supp >= mcs_encoding) {
1980 if (!(cap->supp_mcs.tx_mcs_map &
1981 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
1984 ext_nss_bw = le32_get_bits(cap->vht_cap_info,
1985 IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
1986 supp_width = le32_get_bits(cap->vht_cap_info,
1987 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
1989 /* if not capable, treat ext_nss_bw as 0 */
1990 if (!ext_nss_bw_capable)
1993 /* This is invalid */
1994 if (supp_width == 3)
1997 /* This is an invalid combination so pretend nothing is supported */
1998 if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2002 * Cover all the special cases according to IEEE 802.11-2016
2003 * Table 9-250. All other cases are either factor of 1 or not
2007 case IEEE80211_VHT_CHANWIDTH_USE_HT:
2008 case IEEE80211_VHT_CHANWIDTH_80MHZ:
2009 if ((supp_width == 1 || supp_width == 2) &&
2011 return 2 * max_vht_nss;
2013 case IEEE80211_VHT_CHANWIDTH_160MHZ:
2014 if (supp_width == 0 &&
2015 (ext_nss_bw == 1 || ext_nss_bw == 2))
2016 return DIV_ROUND_UP(max_vht_nss, 2);
2017 if (supp_width == 0 &&
2019 return DIV_ROUND_UP(3 * max_vht_nss, 4);
2020 if (supp_width == 1 &&
2022 return 2 * max_vht_nss;
2024 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2025 if (supp_width == 0 &&
2026 (ext_nss_bw == 1 || ext_nss_bw == 2))
2027 return 0; /* not possible */
2028 if (supp_width == 0 &&
2030 return DIV_ROUND_UP(max_vht_nss, 2);
2031 if (supp_width == 0 &&
2033 return DIV_ROUND_UP(3 * max_vht_nss, 4);
2034 if (supp_width == 1 &&
2036 return 0; /* not possible */
2037 if (supp_width == 1 &&
2039 return DIV_ROUND_UP(max_vht_nss, 2);
2040 if (supp_width == 1 &&
2042 return DIV_ROUND_UP(3 * max_vht_nss, 4);
2046 /* not covered or invalid combination received */
2049 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);