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-<table class="head">
-  <tr>
-    <td class="head-ltitle">IEEE80211_NODE(9)</td>
-    <td class="head-vol">Kernel Developer's Manual</td>
-    <td class="head-rtitle">IEEE80211_NODE(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_node</code> &#x2014;
-    <span class="Nd">software 802.11 stack node management functions</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"><var class="Ft">struct ieee80211_node *</var>
-  <br/>
-  <code class="Fn">ieee80211_find_rxnode</code>(<var class="Fa">struct
-    ieee80211com *</var>, <var class="Fa">const struct ieee80211_frame_min
-    *</var>);</p>
-<p class="Pp"><var class="Ft">struct ieee80211_node *</var>
-  <br/>
-  <code class="Fn">ieee80211_find_rxnode_withkey</code>(<var class="Fa">struct
-    ieee80211com *</var>, <var class="Fa">const struct ieee80211_frame_min
-    *</var>, <var class="Fa">ieee80211_keyix</var>);</p>
-<p class="Pp"><var class="Ft">struct ieee80211_node *</var>
-  <br/>
-  <code class="Fn">ieee80211_ref_node</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ieee80211_node *</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">ieee80211_free_node</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ieee80211_node *</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">ieee80211_iterate_nodes</code>(<var class="Fa">struct
-    ieee80211_node_table *</var>, <var class="Fa">ieee80211_iter_func *f</var>,
-    <var class="Fa">void *arg</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">ieee80211_dump_nodes</code>(<var class="Fa">struct
-    ieee80211_node_table *</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">ieee80211_dump_node</code>(<var class="Fa">struct
-    ieee80211_node *</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> layer that supports 802.11
-    device drivers maintains a database of peer stations called the &#x201C;node
-    table&#x201D; in the <var class="Vt">ic_sta</var> entry of the
-    <var class="Vt">ieee80211com</var> structure. Station mode vaps create an
-    entry for the access point the station is associated to. AP mode vaps create
-    entries for associated stations. Adhoc and mesh mode vaps create entries for
-    neighbor stations. WDS mode vaps create an entry for the peer station.
-    Stations for all vaps reside in the same table; each node entry has a
-    <var class="Vt">ni_vap</var> field that identifies the vap that created it.
-    In some instances an entry is used by multiple vaps (e.g. for dynamic WDS a
-    station associated to an ap vap may also be the peer of a WDS vap).</p>
-<p class="Pp" id="ieee80211_ref_node">Node table entries are reference counted.
-    That is, there is a count of all long term references that determines when
-    an entry may be reclaimed. References are held by every in-flight frame sent
-    to a station to ensure the entry is not reclaimed while the frame is queued
-    or otherwise held by a driver. Routines that lookup a table entry return a
-    &#x201C;held reference&#x201D; (i.e. a pointer to a table entry with the
-    reference count incremented). The
-    <a class="permalink" href="#ieee80211_ref_node"><code class="Fn">ieee80211_ref_node</code></a>()
-    call explicitly increments the reference count of a node.
-    <a class="permalink" href="#ieee80211_free_node"><code class="Fn" id="ieee80211_free_node">ieee80211_free_node</code></a>()
-    decrements the reference count of a node and if the count goes to zero
-    reclaims the table entry.</p>
-<p class="Pp">The station table and its entries are exposed to drivers in
-    several ways. Each frame transmitted to a station includes a reference to
-    the associated node in the <var class="Vt">m_pkthdr.rcvif</var> field. This
-    reference must be reclaimed by the driver when transmit processing is done.
-    For each frame received the driver must lookup the table entry to use in
-    dispatching the frame &#x201C;up the stack&#x201D;. This lookup implicitly
-    obtains a reference to the table entry and the driver must reclaim the
-    reference when frame processing is completed. Otherwise drivers frequently
-    inspect the contents of the <var class="Vt">iv_bss</var> node when handling
-    state machine changes as important information is maintained in the data
-    structure.</p>
-<p class="Pp" id="ieee80211_iterate_nodes">The node table is opaque to drivers.
-    Entries may be looked up using one of the pre-defined API's or the
-    <a class="permalink" href="#ieee80211_iterate_nodes"><code class="Fn">ieee80211_iterate_nodes</code></a>()
-    call may be used to iterate through all entries to do per-node processing or
-    implement some non-standard search mechanism. Note that
-    <code class="Fn">ieee80211_iterate_nodes</code>() is single-threaded
-    per-device and the effort processing involved is fairly substantial so it
-    should be used carefully.</p>
-<p class="Pp" id="ieee80211_dump_node">Two routines are provided to print the
-    contents of nodes to the console for debugging:
-    <a class="permalink" href="#ieee80211_dump_node"><code class="Fn">ieee80211_dump_node</code></a>()
-    displays the contents of a single node while
-    <a class="permalink" href="#ieee80211_dump_nodes"><code class="Fn" id="ieee80211_dump_nodes">ieee80211_dump_nodes</code></a>()
-    displays the contents of the specified node table. Nodes may also be
-    displayed using <a class="Xr">ddb(4)</a> with the &#x201C;show node&#x201D;
-    directive and the station node table can be displayed with &#x201C;show
-    statab&#x201D;.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DRIVER_PRIVATE_STATE"><a class="permalink" href="#DRIVER_PRIVATE_STATE">DRIVER
-  PRIVATE STATE</a></h1>
-<p class="Pp">Node data structures may be extended by the driver to include
-    driver-private state. This is done by overriding the
-    <var class="Vt">ic_node_alloc</var> method used to allocate a node table
-    entry. The driver method must allocate a structure that is an extension of
-    the <var class="Vt">ieee80211_node</var> structure. For example the
-    <a class="Xr">iwi(4)</a> driver defines a private node structure as:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>struct iwi_node {
-        struct ieee80211_node   in_node;
-	int                     in_station;
-};</pre>
-</div>
-<p class="Pp">and then provides a private allocation routine that does this:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>static struct ieee80211_node *
-iwi_node_alloc(struct ieee80211vap *vap,
-    const uint8_t mac[IEEE80211_ADDR_LEN])
-{
-        struct iwi_node *in;
-
-        in = malloc(sizeof(struct iwi_node), M_80211_NODE,
-		M_NOWAIT | M_ZERO);
-        if (in == NULL)
-                return NULL;
-        in-&gt;in_station = -1;
-        return &amp;in-&gt;in_node;
-}</pre>
-</div>
-<p class="Pp">Note that when reclaiming a node allocated by the driver the
-    &#x201C;parent method&#x201D; must be called to ensure
-    <code class="Nm">net80211</code> state is reclaimed; for example:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>static void
-iwi_node_free(struct ieee80211_node *ni)
-{
-        struct ieee80211com *ic = ni-&gt;ni_ic;
-        struct iwi_softc *sc = ic-&gt;ic_ifp-&gt;if_softc;
-        struct iwi_node *in = (struct iwi_node *)ni;
-
-        if (in-&gt;in_station != -1)
-                free_unr(sc-&gt;sc_unr, in-&gt;in_station);
-        sc-&gt;sc_node_free(ni);	/* invoke net80211 free handler */
-}</pre>
-</div>
-<p class="Pp">Beware that care must be taken to avoid holding references that
-    might cause nodes from being reclaimed. <code class="Nm">net80211</code>
-    will reclaim a node when the last reference is reclaimed in its data
-    structures. However if a driver holds additional references then
-    <code class="Nm">net80211</code> will not recognize this and table entries
-    will not be reclaimed. Such references should not be needed if the driver
-    overrides the <var class="Vt">ic_node_cleanup</var> and/or
-    <var class="Vt">ic_node_free</var> methods.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="KEY_TABLE_SUPPORT"><a class="permalink" href="#KEY_TABLE_SUPPORT">KEY
-  TABLE SUPPORT</a></h1>
-<p class="Pp">Node table lookups are typically done using a hash of the
-    stations' mac address. When receiving frames this is sufficient to find the
-    node table entry for the transmitter. But some devices also identify the
-    sending station in the device state received with each frame and this data
-    can be used to optimize lookups on receive using a companion table called
-    the &#x201C;keytab&#x201D;. This table records a separate node table
-    reference that can be fetched without any locking using the table index.
-    This logic is handled with the
-    <a class="permalink" href="#ieee80211_find_rxnode_withkey"><code class="Fn" id="ieee80211_find_rxnode_withkey">ieee80211_find_rxnode_withkey</code></a>()
-    call: if a keytab entry is found using the specified index then it is
-    returned directly; otherwise a normal lookup is done and the keytab entry is
-    written using the specified index. If the specified index is
-    <code class="Dv">IEEE80211_KEYIX_NONE</code> then a normal lookup is done
-    without a table update.</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">ddb(4)</a>, <a class="Xr">ieee80211(9)</a>,
-    <a class="Xr">ieee80211_proto(9)</a></p>
-</section>
-</div>
-<table class="foot">
-  <tr>
-    <td class="foot-date">October 2, 2023</td>
-    <td class="foot-os">FreeBSD 15.0</td>
-  </tr>
-</table>