package/kernel/mac80211/patches/341-mac80211-parse-VHT-info-in-injected-frames.patch

   1 From: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
   2 Date: Tue, 23 Feb 2016 15:43:35 +0100
   3 Subject: [PATCH] mac80211: parse VHT info in injected frames
   4
   5 Add VHT radiotap parsing support to ieee80211_parse_tx_radiotap().
   6 That capability has been tested using a d-link dir-860l rev b1 running
   7 OpenWrt trunk and mt76 driver
   8
   9 Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
  10 ---
  11
  12 --- a/net/mac80211/tx.c
  13 +++ b/net/mac80211/tx.c
  14 @@ -1690,6 +1690,8 @@ static bool ieee80211_parse_tx_radiotap(
  15         u8 rate_retries = 0;
  16         u16 rate_flags = 0;
  17         u8 mcs_known, mcs_flags, mcs_bw;
  18 +       u16 vht_known;
  19 +       u8 vht_mcs = 0, vht_nss = 0;
  20         int i;
  21
  22         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
  23 @@ -1771,6 +1773,32 @@ static bool ieee80211_parse_tx_radiotap(
  24                                 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  25                         break;
  26
  27 +               case IEEE80211_RADIOTAP_VHT:
  28 +                       vht_known = get_unaligned_le16(iterator.this_arg);
  29 +                       rate_found = true;
  30 +
  31 +                       rate_flags = IEEE80211_TX_RC_VHT_MCS;
  32 +                       if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
  33 +                           (iterator.this_arg[2] &
  34 +                            IEEE80211_RADIOTAP_VHT_FLAG_SGI))
  35 +                               rate_flags |= IEEE80211_TX_RC_SHORT_GI;
  36 +                       if (vht_known &
  37 +                           IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
  38 +                               if (iterator.this_arg[3] == 1)
  39 +                                       rate_flags |=
  40 +                                               IEEE80211_TX_RC_40_MHZ_WIDTH;
  41 +                               else if (iterator.this_arg[3] == 4)
  42 +                                       rate_flags |=
  43 +                                               IEEE80211_TX_RC_80_MHZ_WIDTH;
  44 +                               else if (iterator.this_arg[3] == 11)
  45 +                                       rate_flags |=
  46 +                                               IEEE80211_TX_RC_160_MHZ_WIDTH;
  47 +                       }
  48 +
  49 +                       vht_mcs = iterator.this_arg[4] >> 4;
  50 +                       vht_nss = iterator.this_arg[4] & 0xF;
  51 +                       break;
  52 +
  53                 /*
  54                  * Please update the file
  55                  * Documentation/networking/mac80211-injection.txt
  56 @@ -1796,6 +1824,9 @@ static bool ieee80211_parse_tx_radiotap(
  57
  58                 if (rate_flags & IEEE80211_TX_RC_MCS) {
  59                         info->control.rates[0].idx = rate;
  60 +               } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
  61 +                       ieee80211_rate_set_vht(info->control.rates, vht_mcs,
  62 +                                              vht_nss);
  63                 } else {
  64                         for (i = 0; i < sband->n_bitrates; i++) {
  65                                 if (rate * 5 != sband->bitrates[i].bitrate)