package/network/services/hostapd/patches/003-wpa_supplicant-handle-HT40-and-mode-downgrade-in-AP-.patch

   1 From 978a59514ccde994b5c06e1cbb49cc8cebe6381c Mon Sep 17 00:00:00 2001
   2 From: Markus Theil <markus.theil@tu-ilmenau.de>
   3 Date: Tue, 30 Jun 2020 13:53:19 +0200
   4 Subject: [PATCH 03/19] wpa_supplicant: handle HT40 and mode downgrade in AP
   5  mode
   6
   7 This patch adds some missing pieces to the interface configuration
   8 of AP/mesh mode in wpa_supplicant.
   9  - check for secondary channel and HT40 capability
  10  - try to downgrade to 11b if 11g is not available
  11 Especially with the HT40 check, this code now performs all settings,
  12 which the deleted/duplicated mesh code did.
  13
  14 Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
  15 ---
  16  wpa_supplicant/ap.c | 49 ++++++++++++++++++++++++++++++++++++---------
  17  1 file changed, 40 insertions(+), 9 deletions(-)
  18
  19 --- a/wpa_supplicant/ap.c
  20 +++ b/wpa_supplicant/ap.c
  21 @@ -134,6 +134,23 @@ no_vht:
  22  }
  23
  24
  25 +static struct hostapd_hw_modes *wpa_supplicant_find_hw_mode(struct wpa_supplicant *wpa_s,
  26 +                                                           enum hostapd_hw_mode hw_mode)
  27 +{
  28 +       struct hostapd_hw_modes *mode = NULL;
  29 +       int i;
  30 +
  31 +       for (i = 0; i < wpa_s->hw.num_modes; i++) {
  32 +               if (wpa_s->hw.modes[i].mode == hw_mode) {
  33 +                       mode = &wpa_s->hw.modes[i];
  34 +                       break;
  35 +               }
  36 +       }
  37 +
  38 +       return mode;
  39 +}
  40 +
  41 +
  42  int wpa_supplicant_conf_ap_ht(struct wpa_supplicant *wpa_s,
  43                               struct wpa_ssid *ssid,
  44                               struct hostapd_config *conf)
  45 @@ -147,9 +164,6 @@ int wpa_supplicant_conf_ap_ht(struct wpa
  46                 return -1;
  47         }
  48
  49 -       /* TODO: enable HT40 if driver supports it;
  50 -        * drop to 11b if driver does not support 11g */
  51 -
  52         /*
  53          * Enable HT20 if the driver supports it, by setting conf->ieee80211n
  54          * and a mask of allowed capabilities within conf->ht_capab.
  55 @@ -158,17 +172,27 @@ int wpa_supplicant_conf_ap_ht(struct wpa
  56          */
  57         if (wpa_s->hw.modes) {
  58                 struct hostapd_hw_modes *mode = NULL;
  59 -               int i, no_ht = 0;
  60 +               int no_ht = 0;
  61
  62                 wpa_printf(MSG_DEBUG,
  63                            "Determining HT/VHT options based on driver capabilities (freq=%u chan=%u)",
  64                            ssid->frequency, conf->channel);
  65
  66 -               for (i = 0; i < wpa_s->hw.num_modes; i++) {
  67 -                       if (wpa_s->hw.modes[i].mode == conf->hw_mode) {
  68 -                               mode = &wpa_s->hw.modes[i];
  69 -                               break;
  70 -                       }
  71 +               mode = wpa_supplicant_find_hw_mode(wpa_s, conf->hw_mode);
  72 +
  73 +               /* may drop drop to 11b if driver does not support 11g */
  74 +               if (!mode && conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
  75 +                       conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
  76 +                       wpa_printf(MSG_INFO,
  77 +                          "Try downgrade to IEEE 802.11b as 802.11g is not "
  78 +                          "supported by the current hardware");
  79 +                       mode = wpa_supplicant_find_hw_mode(wpa_s, conf->hw_mode);
  80 +               }
  81 +
  82 +               if (!mode) {
  83 +                       wpa_printf(MSG_ERROR,
  84 +                          "No match between requested and supported hw modes found");
  85 +                       return -1;
  86                 }
  87
  88  #ifdef CONFIG_HT_OVERRIDES
  89 @@ -193,6 +217,13 @@ int wpa_supplicant_conf_ap_ht(struct wpa
  90                                       HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET),
  91                                    ssid->ht40);
  92                         conf->ieee80211n = 1;
  93 +
  94 +                       if (ssid->ht40 &&
  95 +                           mode->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)
  96 +                               conf->secondary_channel = ssid->ht40;
  97 +                       else
  98 +                               conf->secondary_channel = 0;
  99 +
 100  #ifdef CONFIG_P2P
 101                         if (ssid->p2p_group &&
 102                             conf->hw_mode == HOSTAPD_MODE_IEEE80211A &&