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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>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Lorenzo Bianconi 2016-02-23 15:43:35 +01:00 committed by Johannes Berg
parent 1948b2a2ec
commit 646e76bb5d
2 changed files with 44 additions and 0 deletions
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13
Documentation/networking/mac80211-injection.txt
View File

@ -45,6 +45,19 @@ radiotap headers and used to control injection:
number of retries when either IEEE80211_RADIOTAP_RATE or
IEEE80211_RADIOTAP_MCS was used
* IEEE80211_RADIOTAP_VHT
VHT mcs and number of streams used in the transmission (only for devices
without own rate control). Also other fields are parsed
flags field
IEEE80211_RADIOTAP_VHT_FLAG_SGI: use short guard interval
bandwidth field
1: send using 40MHz channel width
4: send using 80MHz channel width
11: send using 160MHz channel width
The injection code can also skip all other currently defined radiotap fields
facilitating replay of captured radiotap headers directly.

31
net/mac80211/tx.c
View File

@ -1692,6 +1692,8 @@ static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
u8 rate_retries = 0;
u16 rate_flags = 0;
u8 mcs_known, mcs_flags;
u16 vht_known;
u8 vht_mcs = 0, vht_nss = 0;
int i;
info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
@ -1772,6 +1774,32 @@ static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
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
@ -1797,6 +1825,9 @@ static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
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)