2 * Wireless utility functions
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
6 #include <linux/bitops.h>
7 #include <linux/etherdevice.h>
8 #include <net/cfg80211.h>
12 struct ieee80211_rate *
13 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
14 u32 basic_rates, int bitrate)
16 struct ieee80211_rate *result = &sband->bitrates[0];
19 for (i = 0; i < sband->n_bitrates; i++) {
20 if (!(basic_rates & BIT(i)))
22 if (sband->bitrates[i].bitrate > bitrate)
24 result = &sband->bitrates[i];
29 EXPORT_SYMBOL(ieee80211_get_response_rate);
31 int ieee80211_channel_to_frequency(int chan)
34 return 2407 + chan * 5;
39 /* FIXME: 802.11j 17.3.8.3.2 */
40 return (chan + 1000) * 5;
42 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
44 int ieee80211_frequency_to_channel(int freq)
50 return (freq - 2407) / 5;
52 /* FIXME: 802.11j 17.3.8.3.2 */
55 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
57 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
60 enum ieee80211_band band;
61 struct ieee80211_supported_band *sband;
64 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
65 sband = wiphy->bands[band];
70 for (i = 0; i < sband->n_channels; i++) {
71 if (sband->channels[i].center_freq == freq)
72 return &sband->channels[i];
78 EXPORT_SYMBOL(__ieee80211_get_channel);
80 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
81 enum ieee80211_band band)
86 case IEEE80211_BAND_5GHZ:
88 for (i = 0; i < sband->n_bitrates; i++) {
89 if (sband->bitrates[i].bitrate == 60 ||
90 sband->bitrates[i].bitrate == 120 ||
91 sband->bitrates[i].bitrate == 240) {
92 sband->bitrates[i].flags |=
93 IEEE80211_RATE_MANDATORY_A;
99 case IEEE80211_BAND_2GHZ:
101 for (i = 0; i < sband->n_bitrates; i++) {
102 if (sband->bitrates[i].bitrate == 10) {
103 sband->bitrates[i].flags |=
104 IEEE80211_RATE_MANDATORY_B |
105 IEEE80211_RATE_MANDATORY_G;
109 if (sband->bitrates[i].bitrate == 20 ||
110 sband->bitrates[i].bitrate == 55 ||
111 sband->bitrates[i].bitrate == 110 ||
112 sband->bitrates[i].bitrate == 60 ||
113 sband->bitrates[i].bitrate == 120 ||
114 sband->bitrates[i].bitrate == 240) {
115 sband->bitrates[i].flags |=
116 IEEE80211_RATE_MANDATORY_G;
120 if (sband->bitrates[i].bitrate != 10 &&
121 sband->bitrates[i].bitrate != 20 &&
122 sband->bitrates[i].bitrate != 55 &&
123 sband->bitrates[i].bitrate != 110)
124 sband->bitrates[i].flags |=
125 IEEE80211_RATE_ERP_G;
127 WARN_ON(want != 0 && want != 3 && want != 6);
129 case IEEE80211_NUM_BANDS:
135 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
137 enum ieee80211_band band;
139 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
140 if (wiphy->bands[band])
141 set_mandatory_flags_band(wiphy->bands[band], band);
144 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
145 struct key_params *params, int key_idx,
154 * Disallow pairwise keys with non-zero index unless it's WEP
155 * (because current deployments use pairwise WEP keys with
156 * non-zero indizes but 802.11i clearly specifies to use zero)
158 if (mac_addr && key_idx &&
159 params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
160 params->cipher != WLAN_CIPHER_SUITE_WEP104)
163 switch (params->cipher) {
164 case WLAN_CIPHER_SUITE_WEP40:
165 if (params->key_len != WLAN_KEY_LEN_WEP40)
168 case WLAN_CIPHER_SUITE_TKIP:
169 if (params->key_len != WLAN_KEY_LEN_TKIP)
172 case WLAN_CIPHER_SUITE_CCMP:
173 if (params->key_len != WLAN_KEY_LEN_CCMP)
176 case WLAN_CIPHER_SUITE_WEP104:
177 if (params->key_len != WLAN_KEY_LEN_WEP104)
180 case WLAN_CIPHER_SUITE_AES_CMAC:
181 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
189 switch (params->cipher) {
190 case WLAN_CIPHER_SUITE_WEP40:
191 case WLAN_CIPHER_SUITE_WEP104:
192 /* These ciphers do not use key sequence */
194 case WLAN_CIPHER_SUITE_TKIP:
195 case WLAN_CIPHER_SUITE_CCMP:
196 case WLAN_CIPHER_SUITE_AES_CMAC:
197 if (params->seq_len != 6)
203 for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
204 if (params->cipher == rdev->wiphy.cipher_suites[i])
206 if (i == rdev->wiphy.n_cipher_suites)
212 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
213 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
214 const unsigned char rfc1042_header[] __aligned(2) =
215 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
216 EXPORT_SYMBOL(rfc1042_header);
218 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
219 const unsigned char bridge_tunnel_header[] __aligned(2) =
220 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
221 EXPORT_SYMBOL(bridge_tunnel_header);
223 unsigned int ieee80211_hdrlen(__le16 fc)
225 unsigned int hdrlen = 24;
227 if (ieee80211_is_data(fc)) {
228 if (ieee80211_has_a4(fc))
230 if (ieee80211_is_data_qos(fc))
231 hdrlen += IEEE80211_QOS_CTL_LEN;
235 if (ieee80211_is_ctl(fc)) {
237 * ACK and CTS are 10 bytes, all others 16. To see how
238 * to get this condition consider
239 * subtype mask: 0b0000000011110000 (0x00F0)
240 * ACK subtype: 0b0000000011010000 (0x00D0)
241 * CTS subtype: 0b0000000011000000 (0x00C0)
242 * bits that matter: ^^^ (0x00E0)
243 * value of those: 0b0000000011000000 (0x00C0)
245 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
253 EXPORT_SYMBOL(ieee80211_hdrlen);
255 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
257 const struct ieee80211_hdr *hdr =
258 (const struct ieee80211_hdr *)skb->data;
261 if (unlikely(skb->len < 10))
263 hdrlen = ieee80211_hdrlen(hdr->frame_control);
264 if (unlikely(hdrlen > skb->len))
268 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
270 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
272 int ae = meshhdr->flags & MESH_FLAGS_AE;
277 case MESH_FLAGS_AE_A4:
279 case MESH_FLAGS_AE_A5_A6:
281 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
288 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
289 enum nl80211_iftype iftype)
291 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
292 u16 hdrlen, ethertype;
295 u8 src[ETH_ALEN] __aligned(2);
297 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
300 hdrlen = ieee80211_hdrlen(hdr->frame_control);
302 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
304 * IEEE 802.11 address fields:
305 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
306 * 0 0 DA SA BSSID n/a
307 * 0 1 DA BSSID SA n/a
308 * 1 0 BSSID SA DA n/a
311 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
312 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
314 switch (hdr->frame_control &
315 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
316 case cpu_to_le16(IEEE80211_FCTL_TODS):
317 if (unlikely(iftype != NL80211_IFTYPE_AP &&
318 iftype != NL80211_IFTYPE_AP_VLAN))
321 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
322 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
323 iftype != NL80211_IFTYPE_MESH_POINT &&
324 iftype != NL80211_IFTYPE_AP_VLAN &&
325 iftype != NL80211_IFTYPE_STATION))
327 if (iftype == NL80211_IFTYPE_MESH_POINT) {
328 struct ieee80211s_hdr *meshdr =
329 (struct ieee80211s_hdr *) (skb->data + hdrlen);
330 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
331 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
332 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
333 memcpy(src, meshdr->eaddr2, ETH_ALEN);
337 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
338 if ((iftype != NL80211_IFTYPE_STATION &&
339 iftype != NL80211_IFTYPE_MESH_POINT) ||
340 (is_multicast_ether_addr(dst) &&
341 !compare_ether_addr(src, addr)))
343 if (iftype == NL80211_IFTYPE_MESH_POINT) {
344 struct ieee80211s_hdr *meshdr =
345 (struct ieee80211s_hdr *) (skb->data + hdrlen);
346 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
347 if (meshdr->flags & MESH_FLAGS_AE_A4)
348 memcpy(src, meshdr->eaddr1, ETH_ALEN);
352 if (iftype != NL80211_IFTYPE_ADHOC)
357 if (unlikely(skb->len - hdrlen < 8))
360 payload = skb->data + hdrlen;
361 ethertype = (payload[6] << 8) | payload[7];
363 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
364 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
365 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
366 /* remove RFC1042 or Bridge-Tunnel encapsulation and
367 * replace EtherType */
368 skb_pull(skb, hdrlen + 6);
369 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
370 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
375 skb_pull(skb, hdrlen);
376 len = htons(skb->len);
377 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
378 memcpy(ehdr->h_dest, dst, ETH_ALEN);
379 memcpy(ehdr->h_source, src, ETH_ALEN);
384 EXPORT_SYMBOL(ieee80211_data_to_8023);
386 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
387 enum nl80211_iftype iftype, u8 *bssid, bool qos)
389 struct ieee80211_hdr hdr;
390 u16 hdrlen, ethertype;
392 const u8 *encaps_data;
393 int encaps_len, skip_header_bytes;
397 if (unlikely(skb->len < ETH_HLEN))
400 nh_pos = skb_network_header(skb) - skb->data;
401 h_pos = skb_transport_header(skb) - skb->data;
403 /* convert Ethernet header to proper 802.11 header (based on
405 ethertype = (skb->data[12] << 8) | skb->data[13];
406 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
409 case NL80211_IFTYPE_AP:
410 case NL80211_IFTYPE_AP_VLAN:
411 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
413 memcpy(hdr.addr1, skb->data, ETH_ALEN);
414 memcpy(hdr.addr2, addr, ETH_ALEN);
415 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
418 case NL80211_IFTYPE_STATION:
419 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
421 memcpy(hdr.addr1, bssid, ETH_ALEN);
422 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
423 memcpy(hdr.addr3, skb->data, ETH_ALEN);
426 case NL80211_IFTYPE_ADHOC:
428 memcpy(hdr.addr1, skb->data, ETH_ALEN);
429 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
430 memcpy(hdr.addr3, bssid, ETH_ALEN);
438 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
442 hdr.frame_control = fc;
446 skip_header_bytes = ETH_HLEN;
447 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
448 encaps_data = bridge_tunnel_header;
449 encaps_len = sizeof(bridge_tunnel_header);
450 skip_header_bytes -= 2;
451 } else if (ethertype > 0x600) {
452 encaps_data = rfc1042_header;
453 encaps_len = sizeof(rfc1042_header);
454 skip_header_bytes -= 2;
460 skb_pull(skb, skip_header_bytes);
461 nh_pos -= skip_header_bytes;
462 h_pos -= skip_header_bytes;
464 head_need = hdrlen + encaps_len - skb_headroom(skb);
466 if (head_need > 0 || skb_cloned(skb)) {
467 head_need = max(head_need, 0);
471 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
472 printk(KERN_ERR "failed to reallocate Tx buffer\n");
475 skb->truesize += head_need;
479 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
480 nh_pos += encaps_len;
484 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
489 /* Update skb pointers to various headers since this modified frame
490 * is going to go through Linux networking code that may potentially
491 * need things like pointer to IP header. */
492 skb_set_mac_header(skb, 0);
493 skb_set_network_header(skb, nh_pos);
494 skb_set_transport_header(skb, h_pos);
498 EXPORT_SYMBOL(ieee80211_data_from_8023);
501 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
502 const u8 *addr, enum nl80211_iftype iftype,
503 const unsigned int extra_headroom)
505 struct sk_buff *frame = NULL;
508 const struct ethhdr *eth;
510 u8 dst[ETH_ALEN], src[ETH_ALEN];
512 err = ieee80211_data_to_8023(skb, addr, iftype);
516 /* skip the wrapping header */
517 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
521 while (skb != frame) {
523 __be16 len = eth->h_proto;
524 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
526 remaining = skb->len;
527 memcpy(dst, eth->h_dest, ETH_ALEN);
528 memcpy(src, eth->h_source, ETH_ALEN);
530 padding = (4 - subframe_len) & 0x3;
531 /* the last MSDU has no padding */
532 if (subframe_len > remaining)
535 skb_pull(skb, sizeof(struct ethhdr));
536 /* reuse skb for the last subframe */
537 if (remaining <= subframe_len + padding)
540 unsigned int hlen = ALIGN(extra_headroom, 4);
542 * Allocate and reserve two bytes more for payload
543 * alignment since sizeof(struct ethhdr) is 14.
545 frame = dev_alloc_skb(hlen + subframe_len + 2);
549 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
550 memcpy(skb_put(frame, ntohs(len)), skb->data,
553 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
556 dev_kfree_skb(frame);
561 skb_reset_network_header(frame);
562 frame->dev = skb->dev;
563 frame->priority = skb->priority;
565 payload = frame->data;
566 ethertype = (payload[6] << 8) | payload[7];
568 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
569 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
570 compare_ether_addr(payload,
571 bridge_tunnel_header) == 0)) {
572 /* remove RFC1042 or Bridge-Tunnel
573 * encapsulation and replace EtherType */
575 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
576 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
578 memcpy(skb_push(frame, sizeof(__be16)), &len,
580 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
581 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
583 __skb_queue_tail(list, frame);
589 __skb_queue_purge(list);
593 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
595 /* Given a data frame determine the 802.1p/1d tag to use. */
596 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
600 /* skb->priority values from 256->263 are magic values to
601 * directly indicate a specific 802.1d priority. This is used
602 * to allow 802.1d priority to be passed directly in from VLAN
605 if (skb->priority >= 256 && skb->priority <= 263)
606 return skb->priority - 256;
608 switch (skb->protocol) {
609 case htons(ETH_P_IP):
610 dscp = ip_hdr(skb)->tos & 0xfc;
618 EXPORT_SYMBOL(cfg80211_classify8021d);
620 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
624 pos = bss->information_elements;
627 end = pos + bss->len_information_elements;
629 while (pos + 1 < end) {
630 if (pos + 2 + pos[1] > end)
639 EXPORT_SYMBOL(ieee80211_bss_get_ie);
641 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
643 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
644 struct net_device *dev = wdev->netdev;
647 if (!wdev->connect_keys)
650 for (i = 0; i < 6; i++) {
651 if (!wdev->connect_keys->params[i].cipher)
653 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
654 &wdev->connect_keys->params[i])) {
655 printk(KERN_ERR "%s: failed to set key %d\n",
659 if (wdev->connect_keys->def == i)
660 if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
661 printk(KERN_ERR "%s: failed to set defkey %d\n",
665 if (wdev->connect_keys->defmgmt == i)
666 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
667 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
671 kfree(wdev->connect_keys);
672 wdev->connect_keys = NULL;
675 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
677 struct cfg80211_event *ev;
679 const u8 *bssid = NULL;
681 spin_lock_irqsave(&wdev->event_lock, flags);
682 while (!list_empty(&wdev->event_list)) {
683 ev = list_first_entry(&wdev->event_list,
684 struct cfg80211_event, list);
686 spin_unlock_irqrestore(&wdev->event_lock, flags);
690 case EVENT_CONNECT_RESULT:
691 if (!is_zero_ether_addr(ev->cr.bssid))
692 bssid = ev->cr.bssid;
693 __cfg80211_connect_result(
695 ev->cr.req_ie, ev->cr.req_ie_len,
696 ev->cr.resp_ie, ev->cr.resp_ie_len,
698 ev->cr.status == WLAN_STATUS_SUCCESS,
702 __cfg80211_roamed(wdev, ev->rm.bssid,
703 ev->rm.req_ie, ev->rm.req_ie_len,
704 ev->rm.resp_ie, ev->rm.resp_ie_len);
706 case EVENT_DISCONNECTED:
707 __cfg80211_disconnected(wdev->netdev,
708 ev->dc.ie, ev->dc.ie_len,
709 ev->dc.reason, true);
711 case EVENT_IBSS_JOINED:
712 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
719 spin_lock_irqsave(&wdev->event_lock, flags);
721 spin_unlock_irqrestore(&wdev->event_lock, flags);
724 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
726 struct wireless_dev *wdev;
729 ASSERT_RDEV_LOCK(rdev);
731 mutex_lock(&rdev->devlist_mtx);
733 list_for_each_entry(wdev, &rdev->netdev_list, list)
734 cfg80211_process_wdev_events(wdev);
736 mutex_unlock(&rdev->devlist_mtx);
739 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
740 struct net_device *dev, enum nl80211_iftype ntype,
741 u32 *flags, struct vif_params *params)
744 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
746 ASSERT_RDEV_LOCK(rdev);
748 /* don't support changing VLANs, you just re-create them */
749 if (otype == NL80211_IFTYPE_AP_VLAN)
752 if (!rdev->ops->change_virtual_intf ||
753 !(rdev->wiphy.interface_modes & (1 << ntype)))
756 /* if it's part of a bridge, reject changing type to station/ibss */
757 if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC ||
758 ntype == NL80211_IFTYPE_STATION))
761 if (ntype != otype) {
762 dev->ieee80211_ptr->use_4addr = false;
765 case NL80211_IFTYPE_ADHOC:
766 cfg80211_leave_ibss(rdev, dev, false);
768 case NL80211_IFTYPE_STATION:
769 cfg80211_disconnect(rdev, dev,
770 WLAN_REASON_DEAUTH_LEAVING, true);
772 case NL80211_IFTYPE_MESH_POINT:
773 /* mesh should be handled? */
779 cfg80211_process_rdev_events(rdev);
782 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
783 ntype, flags, params);
785 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
787 if (!err && params && params->use_4addr != -1)
788 dev->ieee80211_ptr->use_4addr = params->use_4addr;
791 dev->priv_flags &= ~IFF_DONT_BRIDGE;
793 case NL80211_IFTYPE_STATION:
794 if (dev->ieee80211_ptr->use_4addr)
797 case NL80211_IFTYPE_ADHOC:
798 dev->priv_flags |= IFF_DONT_BRIDGE;
800 case NL80211_IFTYPE_AP:
801 case NL80211_IFTYPE_AP_VLAN:
802 case NL80211_IFTYPE_WDS:
803 case NL80211_IFTYPE_MESH_POINT:
806 case NL80211_IFTYPE_MONITOR:
807 /* monitor can't bridge anyway */
809 case NL80211_IFTYPE_UNSPECIFIED:
810 case __NL80211_IFTYPE_AFTER_LAST:
819 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
821 int modulation, streams, bitrate;
823 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
826 /* the formula below does only work for MCS values smaller than 32 */
830 modulation = rate->mcs & 7;
831 streams = (rate->mcs >> 3) + 1;
833 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
837 bitrate *= (modulation + 1);
838 else if (modulation == 4)
839 bitrate *= (modulation + 2);
841 bitrate *= (modulation + 3);
845 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
846 bitrate = (bitrate / 9) * 10;
848 /* do NOT round down here */
849 return (bitrate + 50000) / 100000;