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mac80211: support radiotap L-SIG data

Browse Source 
As before with HE, the data needs to be provided by the
driver in the skb head, since there's not enough space
in the skb CB.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Shaul Triebitz 2018-08-31 11:31:20 +03:00 committed by Johannes Berg
parent 70e53669c4
commit d1332e7be2
3 changed files with 38 additions and 0 deletions
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15
include/net/ieee80211_radiotap.h
View File

@ -75,6 +75,7 @@ enum ieee80211_radiotap_presence {
IEEE80211_RADIOTAP_TIMESTAMP = 22,
IEEE80211_RADIOTAP_HE = 23,
IEEE80211_RADIOTAP_HE_MU = 24,
IEEE80211_RADIOTAP_LSIG = 27,
/* valid in every it_present bitmap, even vendor namespaces */
IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
@ -325,6 +326,20 @@ enum ieee80211_radiotap_he_mu_bits {
IEEE80211_RADIOTAP_HE_MU_FLAGS2_CH2_CTR_26T_RU = 0x0800,
};
enum ieee80211_radiotap_lsig_data1 {
IEEE80211_RADIOTAP_LSIG_DATA1_RATE_KNOWN = 0x0001,
IEEE80211_RADIOTAP_LSIG_DATA1_LENGTH_KNOWN = 0x0002,
};
enum ieee80211_radiotap_lsig_data2 {
IEEE80211_RADIOTAP_LSIG_DATA2_RATE = 0x000f,
IEEE80211_RADIOTAP_LSIG_DATA2_LENGTH = 0xfff0,
};
struct ieee80211_radiotap_lsig {
__le16 data1, data2;
};
/**
* ieee80211_get_radiotap_len - get radiotap header length
*/

2
include/net/mac80211.h
View File

@ -1141,6 +1141,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
* from the RX info data, so leave those zeroed when building this data)
* @RX_FLAG_RADIOTAP_HE_MU: HE MU radiotap data is present
* (&struct ieee80211_radiotap_he_mu)
* @RX_FLAG_RADIOTAP_LSIG: L-SIG radiotap data is present
*/
enum mac80211_rx_flags {
RX_FLAG_MMIC_ERROR = BIT(0),
@ -1171,6 +1172,7 @@ enum mac80211_rx_flags {
RX_FLAG_AMPDU_EOF_BIT_KNOWN = BIT(25),
RX_FLAG_RADIOTAP_HE = BIT(26),
RX_FLAG_RADIOTAP_HE_MU = BIT(27),
RX_FLAG_RADIOTAP_LSIG = BIT(28),
};
/**

21
net/mac80211/rx.c
View File

@ -189,6 +189,12 @@ ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
}
if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
len = ALIGN(len, 2);
len += 4;
BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
}
if (status->chains) {
/* antenna and antenna signal fields */
len += 2 * hweight8(status->chains);
@ -279,6 +285,7 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
struct ieee80211_vendor_radiotap rtap = {};
struct ieee80211_radiotap_he he = {};
struct ieee80211_radiotap_he_mu he_mu = {};
struct ieee80211_radiotap_lsig lsig = {};
if (status->flag & RX_FLAG_RADIOTAP_HE) {
he = *(struct ieee80211_radiotap_he *)skb->data;
@ -291,6 +298,11 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
skb_pull(skb, sizeof(he_mu));
}
if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
skb_pull(skb, sizeof(lsig));
}
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
/* rtap.len and rtap.pad are undone immediately */
@ -630,6 +642,15 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
pos += sizeof(he_mu);
}
if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
/* ensure 2 byte alignment */
while ((pos - (u8 *)rthdr) & 1)
pos++;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
memcpy(pos, &lsig, sizeof(lsig));
pos += sizeof(lsig);
}
for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
*pos++ = status->chain_signal[chain];
*pos++ = chain;