package/madwifi/patches/362-rssithr.patch

   1 Add an optional threshold for low-rssi disconnection. This can be useful
   2 when letting wpa_supplicant control roaming.
   3
   4 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   5
   6 --- a/net80211/ieee80211_ioctl.h
   7 +++ b/net80211/ieee80211_ioctl.h
   8 @@ -647,6 +647,8 @@
   9         IEEE80211_PARAM_PROTMODE_RSSI           = 77,   /* RSSI Threshold for enabling protection mode */
  10         IEEE80211_PARAM_PROTMODE_TIMEOUT        = 78,   /* Timeout for expiring protection mode */
  11         IEEE80211_PARAM_BGSCAN_THRESH           = 79,   /* bg scan rssi threshold */
  12 +       IEEE80211_PARAM_RSSI_DIS_THR    = 80,   /* rssi threshold for disconnection */
  13 +       IEEE80211_PARAM_RSSI_DIS_COUNT  = 81,   /* counter for rssi threshold */
  14  };
  15
  16  #define        SIOCG80211STATS                 (SIOCDEVPRIVATE+2)
  17 --- a/net80211/ieee80211_wireless.c
  18 +++ b/net80211/ieee80211_wireless.c
  19 @@ -2799,6 +2799,12 @@
  20         case IEEE80211_PARAM_ROAM_RATE_11G:
  21                 vap->iv_roam.rate11b = value;
  22                 break;
  23 +       case IEEE80211_PARAM_RSSI_DIS_THR:
  24 +               vap->iv_rssi_dis_thr = value;
  25 +               break;
  26 +       case IEEE80211_PARAM_RSSI_DIS_COUNT:
  27 +               vap->iv_rssi_dis_max = value;
  28 +               break;
  29         case IEEE80211_PARAM_UAPSDINFO:
  30                 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
  31                         if (ic->ic_caps & IEEE80211_C_UAPSD) {
  32 @@ -3184,6 +3190,12 @@
  33         case IEEE80211_PARAM_ROAM_RATE_11G:
  34                 param[0] = vap->iv_roam.rate11b;
  35                 break;
  36 +       case IEEE80211_PARAM_RSSI_DIS_THR:
  37 +               param[0] = vap->iv_rssi_dis_thr;
  38 +               break;
  39 +       case IEEE80211_PARAM_RSSI_DIS_COUNT:
  40 +               param[0] = vap->iv_rssi_dis_max;
  41 +               break;
  42         case IEEE80211_PARAM_UAPSDINFO:
  43                 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
  44                         if (IEEE80211_VAP_UAPSD_ENABLED(vap))
  45 @@ -5733,6 +5745,14 @@
  46           IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rate11g" },
  47         { IEEE80211_PARAM_ROAM_RATE_11G,
  48           0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rate11g" },
  49 +       { IEEE80211_PARAM_RSSI_DIS_THR,
  50 +         IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rssi_disthr" },
  51 +       { IEEE80211_PARAM_RSSI_DIS_THR,
  52 +         0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rssi_disthr" },
  53 +       { IEEE80211_PARAM_RSSI_DIS_COUNT,
  54 +         IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rssi_discnt" },
  55 +       { IEEE80211_PARAM_RSSI_DIS_COUNT,
  56 +         0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rssi_discnt" },
  57         { IEEE80211_PARAM_UAPSDINFO,
  58           IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "uapsd" },
  59         { IEEE80211_PARAM_UAPSDINFO,
  60 --- a/net80211/ieee80211_input.c
  61 +++ b/net80211/ieee80211_input.c
  62 @@ -3261,6 +3261,19 @@
  63                         memcpy(ni->ni_tstamp.data, scan.tstamp,
  64                                 sizeof(ni->ni_tstamp));
  65
  66 +                       /* when rssi falls below the disconnection threshold, drop the connection */
  67 +                       if ((vap->iv_rssi_dis_thr > 0) && (vap->iv_rssi_dis_max > 0)) {
  68 +                               if ((rssi > 0) && (rssi < vap->iv_rssi_dis_thr)) {
  69 +                                       if (++vap->iv_rssi_dis_trig > vap->iv_rssi_dis_max) {
  70 +                                               vap->iv_rssi_dis_trig = 0;
  71 +                                               ieee80211_node_leave(ni);
  72 +                                               return;
  73 +                                       }
  74 +                               } else {
  75 +                                       vap->iv_rssi_dis_trig = 0;
  76 +                               }
  77 +                       }
  78 +
  79                         /* When rssi is low, start doing bgscans more frequently to allow
  80                          * the supplicant to make a better switching decision */
  81                         if (!(ic->ic_flags & IEEE80211_F_SCAN) && (rssi < vap->iv_bgscanthr) &&
  82 --- a/net80211/ieee80211_var.h
  83 +++ b/net80211/ieee80211_var.h
  84 @@ -223,6 +223,9 @@
  85         u_int iv_bgscanintvl;                           /* bg scan min interval */
  86         u_int iv_bgscanthr;                                     /* bg scan rssi threshold */
  87         u_int iv_bgscantrintvl;                         /* bg scan trigger interval */
  88 +       u_int iv_rssi_dis_thr;                          /* rssi disassoc threshold */
  89 +       u_int iv_rssi_dis_max;                          /* max beacons below disconnect threshold */
  90 +       u_int iv_rssi_dis_trig;                         /* rssi disassoc trigger count */
  91         unsigned long iv_bgscanthr_next;                /* last trigger for bgscan */
  92         unsigned long iv_lastconnect;   /* time of last connect attempt */
  93         u_int iv_scanvalid;                             /* scan cache valid threshold */