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mac80211: report some VHT radiotap infos for tx status

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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>
This commit is contained in:
Karl Beldan 2013-07-27 11:47:04 +02:00 committed by Johannes Berg
parent 9e2bc79bce
commit a824131017
1 changed files with 63 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
net/mac80211/status.c
View File

@ -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);