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From: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Date: Tue, 23 Feb 2016 15:43:35 +0100
Subject: [PATCH] mac80211: parse VHT info in injected frames
Add VHT radiotap parsing support to ieee80211_parse_tx_radiotap().
That capability has been tested using a d-link dir-860l rev b1 running
OpenWrt trunk and mt76 driver
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1690,6 +1690,8 @@ static bool ieee80211_parse_tx_radiotap(
u8 rate_retries = 0;
u16 rate_flags = 0;
u8 mcs_known, mcs_flags, mcs_bw;
+ u16 vht_known;
+ u8 vht_mcs = 0, vht_nss = 0;
int i;
info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
@@ -1771,6 +1773,32 @@ static bool ieee80211_parse_tx_radiotap(
rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
break;
+ case IEEE80211_RADIOTAP_VHT:
+ vht_known = get_unaligned_le16(iterator.this_arg);
+ rate_found = true;
+
+ rate_flags = IEEE80211_TX_RC_VHT_MCS;
+ if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
+ (iterator.this_arg[2] &
+ IEEE80211_RADIOTAP_VHT_FLAG_SGI))
+ rate_flags |= IEEE80211_TX_RC_SHORT_GI;
+ if (vht_known &
+ IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
+ if (iterator.this_arg[3] == 1)
+ rate_flags |=
+ IEEE80211_TX_RC_40_MHZ_WIDTH;
+ else if (iterator.this_arg[3] == 4)
+ rate_flags |=
+ IEEE80211_TX_RC_80_MHZ_WIDTH;
+ else if (iterator.this_arg[3] == 11)
+ rate_flags |=
+ IEEE80211_TX_RC_160_MHZ_WIDTH;
+ }
+
+ vht_mcs = iterator.this_arg[4] >> 4;
+ vht_nss = iterator.this_arg[4] & 0xF;
+ break;
+
/*
* Please update the file
* Documentation/networking/mac80211-injection.txt
@@ -1796,6 +1824,9 @@ static bool ieee80211_parse_tx_radiotap(
if (rate_flags & IEEE80211_TX_RC_MCS) {
info->control.rates[0].idx = rate;
+ } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
+ ieee80211_rate_set_vht(info->control.rates, vht_mcs,
+ vht_nss);
} else {
for (i = 0; i < sband->n_bitrates; i++) {
if (rate * 5 != sband->bitrates[i].bitrate)
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