package/madwifi/patches/361-bmiss_handling.patch

   1 Improve the beacon miss handling. Instead of just dropping the connection,
   2 send a directed probe request to the AP to see if it's still responding.
   3 Schedule a software beacon miss timer in this case, which adds a timeout
   4 for the APs probe response.
   5
   6 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   7
   8 --- a/net80211/ieee80211_input.c
   9 +++ b/net80211/ieee80211_input.c
  10 @@ -3400,12 +3400,17 @@ ieee80211_recv_mgmt(struct ieee80211vap
  11                         }
  12
  13                         /* WDS/Repeater: re-schedule software beacon timer for
  14 -                        * STA. */
  15 -                       if ((vap->iv_state == IEEE80211_S_RUN) &&
  16 -                           (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
  17 -                               mod_timer(&vap->iv_swbmiss,
  18 +                        * STA. Reset consecutive bmiss counter as well */
  19 +                       IEEE80211_LOCK_IRQ(ic);
  20 +                       if (vap->iv_state == IEEE80211_S_RUN) {
  21 +                               vap->iv_bmiss_count = 0;
  22 +                               if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
  23 +                                       mod_timer(&vap->iv_swbmiss,
  24                                                 jiffies + vap->iv_swbmiss_period);
  25 +                               else
  26 +                                       del_timer(&vap->iv_swbmiss);
  27                         }
  28 +                       IEEE80211_UNLOCK_IRQ(ic);
  29
  30                         /* If scanning, pass the info to the scan module.
  31                          * Otherwise, check if it's the right time to do
  32 --- a/net80211/ieee80211_proto.c
  33 +++ b/net80211/ieee80211_proto.c
  34 @@ -1209,6 +1209,8 @@ ieee80211_beacon_miss(struct ieee80211co
  35         }
  36         /* XXX locking */
  37         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  38 +               int count;
  39 +
  40                 IEEE80211_DPRINTF(vap,
  41                         IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
  42                         "%s\n", "beacon miss");
  43 @@ -1221,6 +1223,29 @@ ieee80211_beacon_miss(struct ieee80211co
  44                 if (vap->iv_opmode != IEEE80211_M_STA ||
  45                     vap->iv_state != IEEE80211_S_RUN)
  46                         continue;
  47 +
  48 +               IEEE80211_LOCK_IRQ(ic);
  49 +               count = vap->iv_bmiss_count++;
  50 +               if (count) {
  51 +                       /* if the counter was already above zero, reset it
  52 +                        * here, since we're going to do the bmiss handling
  53 +                        * in any case */
  54 +                       vap->iv_bmiss_count = 0;
  55 +               } else {
  56 +                       /* schedule the software beacon miss timer, it will be
  57 +                        * cancelled, if the probe request is acked */
  58 +                       mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
  59 +               }
  60 +               IEEE80211_UNLOCK_IRQ(ic);
  61 +
  62 +               if (!count) {
  63 +                       ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
  64 +                               vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
  65 +                               vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen,
  66 +                               NULL, 0);
  67 +                       continue;
  68 +               }
  69 +
  70                 if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
  71  #ifdef ATH_SUPERG_DYNTURBO
  72                         /*
  73 @@ -1621,14 +1646,14 @@ __ieee80211_newstate(struct ieee80211vap
  74                 }
  75
  76                 /* WDS/Repeater: Start software beacon timer for STA */
  77 +               vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
  78 +               vap->iv_swbmiss.data = (unsigned long) vap;
  79 +               vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
  80 +                       vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
  81 +
  82                 if (ostate != IEEE80211_S_RUN &&
  83                     (vap->iv_opmode == IEEE80211_M_STA &&
  84                      vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
  85 -                       vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
  86 -                       vap->iv_swbmiss.data = (unsigned long) vap;
  87 -                       vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
  88 -                               vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
  89 -
  90                         mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
  91                 }
  92
  93 --- a/net80211/ieee80211_var.h
  94 +++ b/net80211/ieee80211_var.h
  95 @@ -283,6 +283,7 @@ struct ieee80211vap {
  96
  97         struct timer_list iv_swbmiss;                   /* software beacon miss timer */
  98         u_int16_t iv_swbmiss_period;                    /* software beacon miss timer period */
  99 +       u_int16_t iv_bmiss_count;                       /* consecutive beacon miss counter */
 100         struct ieee80211_nsparams iv_nsparams;          /* new state parameters for tasklet for stajoin1 */
 101         struct IEEE80211_TQ_STRUCT iv_stajoin1tq;       /* tasklet for newstate action called from stajoin1tq */
 102         unsigned int iv_nsdone;                         /* Done with scheduled newstate tasklet */