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-<table class="head">
- <tr>
- <td class="head-ltitle">IEEE80211_BMISS(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">IEEE80211_BMISS(9)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">ieee80211_bmiss</code> &#x2014;
- <span class="Nd">802.11 beacon miss support</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">net80211/ieee80211_var.h</a>&gt;</code></p>
-<p class="Pp">
- <br/>
- <var class="Ft">void</var>
- <br/>
- <code class="Fn">ieee80211_beacon_miss</code>(<var class="Fa" style="white-space: nowrap;">struct
- ieee80211com *</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">net80211</code> software layer provides a
- support framework for drivers that includes handling beacon miss events in
- station mode. Drivers can dispatch beacon miss events that are recognized in
- hardware or <code class="Nm">net80211</code> can detect beacon miss if the
- driver dispatches received beacon frames through the normal receive path.
- Software beacon miss support is especially useful when multiple vaps are
- operating and any hardware beacon miss support is not available (e.g.
- operating as an access point together with one or more station mode
- vaps).</p>
-<p class="Pp" id="ieee80211_beacon_miss">Drivers should dispatch beacon miss
- events recognized in the driver with
- <a class="permalink" href="#ieee80211_beacon_miss"><code class="Fn">ieee80211_beacon_miss</code></a>().
- This causes some number of ProbeRequest frames to be sent to the access
- point to check if the association is still alive. If no response is received
- and roaming mode is set to <code class="Dv">IEEE80211_ROAMING_AUTO</code>
- then <code class="Nm">net80211</code> will try to re-associate and if that
- fails trigger a scan to look for the access point or another suitable AP.
- When the <code class="Nm">net80211</code> state machine is being operated
- manually, e.g. by <a class="Xr">wpa_supplicant(8)</a>, then applications are
- notified of the state change and are responsible for handling the work of
- scanning for a new access point. The number of beacon miss events (without a
- ProbeResponse) is user settable with the
- <code class="Dv">IEEE80211_IOC_BMISSTHRESHOLD</code> request.</p>
-<p class="Pp">Software beacon miss detection is enabled per-vap by setting the
- <code class="Dv">IEEE80211_FEXT_SWBMISS</code> flag. Typically this is done
- when a vap is setup when the
- <code class="Dv">IEEE80211_CLONE_NOBEACONS</code> option is supplied to the
- clone operation. But drivers may also force this when they know they need
- help detecting beacon miss. When beacon miss is detected in software the
- event is dispatched without driver involvement. Note that software beacon
- miss handling is not limited to station mode; it can be used in any
- operating mode where beacons from a peer station are received.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">wpa_supplicant(8)</a>,
- <a class="Xr">ieee80211(9)</a>, <a class="Xr">ieee80211_vap(9)</a></p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 4, 2009</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>