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| author | Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> | 2016-02-23 15:43:35 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2016-04-05 10:48:54 +0200 |
| commit | 646e76bb5daf4ca38438c69ffb72cccb605f3466 (patch) | |
| tree | c08ae80347129b2fd0064c8881ca2a452cea15fa | |
| parent | 1948b2a2ec132115b422ae1feba1a3f5598f4acd (diff) | |
| download | linux-646e76bb5daf4ca38438c69ffb72cccb605f3466.tar.gz linux-646e76bb5daf4ca38438c69ffb72cccb605f3466.tar.bz2 linux-646e76bb5daf4ca38438c69ffb72cccb605f3466.zip | |
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>
| -rw-r--r-- | Documentation/networking/mac80211-injection.txt | 13 | ||||
| -rw-r--r-- | net/mac80211/tx.c | 31 |
2 files changed, 44 insertions, 0 deletions
diff --git a/Documentation/networking/mac80211-injection.txt b/Documentation/networking/mac80211-injection.txt index ec8f934c2eb2..e0efcaf5b0ee 100644 --- a/Documentation/networking/mac80211-injection.txt +++ b/Documentation/networking/mac80211-injection.txt @@ -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. diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 62ad5321257d..c485fc26fa0c 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -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) |