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authorKarl Beldan <karl.beldan@rivierawaves.com>2013-07-27 11:47:04 +0200
committerJohannes Berg <johannes.berg@intel.com>2013-08-01 10:49:04 +0200
commita824131017a2c3c8f275c6eb46740cfb8a43f7c5 (patch)
treef6d634a12d72cbd6dd7b5d38457b28a2604445cc /net/mac80211
parent9e2bc79bce58a1ce0005015c9351b3bcaaa02e5c (diff)
downloadlinux-a824131017a2c3c8f275c6eb46740cfb8a43f7c5.tar.bz2
mac80211: report some VHT radiotap infos for tx status
The radiotap VHT info is 12 bytes (required to be aligned on 2) : u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* u8 bandwidth u8 mcs_nss[4] u8 coding u8 group_id u16 partial_aid ATM mac80211 can handle IEEE80211_RADIOTAP_VHT_KNOWN_{GI,BANDWIDTH} and mcs_nss[0] (i.e single user) in simple cases. This is more a placeholder to let sniffers give more clues for VHT, since we don't have yet the proper infrastructure/conventions in mac80211 for complete feedback (e.g consider dynamic BW). Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/status.c76
1 files changed, 63 insertions, 13 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 8eabfd96ca36..368837fe3b80 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -235,7 +235,8 @@ static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
/* IEEE80211_RADIOTAP_RATE rate */
if (info->status.rates[0].idx >= 0 &&
- !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
+ !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
+ IEEE80211_TX_RC_VHT_MCS)))
len += 2;
/* IEEE80211_RADIOTAP_TX_FLAGS */
@@ -244,16 +245,21 @@ static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
/* IEEE80211_RADIOTAP_DATA_RETRIES */
len += 1;
- /* IEEE80211_TX_RC_MCS */
- if (info->status.rates[0].idx >= 0 &&
- info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
- len += 3;
+ /* IEEE80211_RADIOTAP_MCS
+ * IEEE80211_RADIOTAP_VHT */
+ if (info->status.rates[0].idx >= 0) {
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
+ len += 3;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
+ len = ALIGN(len, 2) + 12;
+ }
return len;
}
static void
-ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band *sband,
+ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
+ struct ieee80211_supported_band *sband,
struct sk_buff *skb, int retry_count,
int rtap_len, int shift)
{
@@ -280,7 +286,8 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band *sband,
/* IEEE80211_RADIOTAP_RATE */
if (info->status.rates[0].idx >= 0 &&
- !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
+ !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
+ IEEE80211_TX_RC_VHT_MCS))) {
u16 rate;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
@@ -310,9 +317,12 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band *sband,
*pos = retry_count;
pos++;
- /* IEEE80211_TX_RC_MCS */
- if (info->status.rates[0].idx >= 0 &&
- info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
+ if (info->status.rates[0].idx < 0)
+ return;
+
+ /* IEEE80211_RADIOTAP_MCS
+ * IEEE80211_RADIOTAP_VHT */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
@@ -325,8 +335,48 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band *sband,
pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
pos[2] = info->status.rates[0].idx;
pos += 3;
- }
+ } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
+ u16 known = local->hw.radiotap_vht_details &
+ (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
+ IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
+
+ rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
+
+ /* required alignment from rthdr */
+ pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
+ /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
+ put_unaligned_le16(known, pos);
+ pos += 2;
+
+ /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
+ *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
+ pos++;
+
+ /* u8 bandwidth */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ *pos = 1;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+ *pos = 4;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
+ *pos = 11;
+ else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
+ *pos = 0;
+ pos++;
+
+ /* u8 mcs_nss[4] */
+ *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
+ ieee80211_rate_get_vht_nss(&info->status.rates[0]);
+ pos += 4;
+
+ /* u8 coding */
+ pos++;
+ /* u8 group_id */
+ pos++;
+ /* u16 partial_aid */
+ pos += 2;
+ }
}
static void ieee80211_report_used_skb(struct ieee80211_local *local,
@@ -631,8 +681,8 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
dev_kfree_skb(skb);
return;
}
- ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len,
- shift);
+ ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
+ rtap_len, shift);
/* XXX: is this sufficient for BPF? */
skb_set_mac_header(skb, 0);