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-<table class="head">
- <tr>
- <td class="head-ltitle">NG_L2CAP(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">NG_L2CAP(4)</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">ng_l2cap</code> &#x2014;
- <span class="Nd">Netgraph node type that implements Bluetooth Logical Link
- Control and Adaptation Protocol (L2CAP)</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">sys/types.h</a>&gt;</code>
- <br/>
- <code class="In">#include
- &lt;<a class="In">netgraph/bluetooth/include/ng_hci.h</a>&gt;</code>
- <br/>
- <code class="In">#include
- &lt;<a class="In">netgraph/bluetooth/include/ng_l2cap.h</a>&gt;</code></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">l2cap</code> node type is a Netgraph node
- type that implements Bluetooth Logical Link Control and Adaptation Protocol
- as per chapter D of the Bluetooth Specification Book v1.1.</p>
-<p class="Pp">L2CAP provides connection-oriented and connectionless data
- services to upper layer protocols with protocol multiplexing capability,
- segmentation and reassembly operation, and group abstractions. L2CAP permits
- higher level protocols and applications to transmit and receive L2CAP data
- packets up to 64 kilobytes in length.</p>
-<section class="Ss">
-<h2 class="Ss" id="L2CAP_Assumptions"><a class="permalink" href="#L2CAP_Assumptions">L2CAP
- Assumptions</a></h2>
-<ol class="Bl-enum Bd-indent">
- <li>The ACL link between two units is set up. The Baseband provides orderly
- delivery of data packets, although there might be individual packet
- corruption and duplicates. No more than one ACL link exists between any
- two devices.</li>
- <li>The Baseband always provides the impression of full-duplex communication
- channels. This does not imply that all L2CAP communications are
- bi-directional. Multicasts and unidirectional traffic (e.g., video) do not
- require duplex channels.</li>
- <li>L2CAP provides a reliable channel using the mechanisms available at the
- Baseband layer. The Baseband always performs data integrity checks when
- requested and resends data until it has been successfully acknowledged or
- a timeout occurs. As acknowledgements may be lost, timeouts may occur even
- after the data has been successfully sent.</li>
-</ol>
-</section>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="L2CAP_GENERAL_OPERATION"><a class="permalink" href="#L2CAP_GENERAL_OPERATION">L2CAP
- GENERAL OPERATION</a></h1>
-<p class="Pp">The Logical Link Control and Adaptation Protocol (L2CAP) is based
- around the concept of &#x201C;channels&#x201D;. Each channel is bound to a
- single protocol in a many-to-one fashion. Multiple channels can be bound to
- the same protocol, but a channel cannot be bound to multiple protocols. Each
- L2CAP packet received on a channel is directed to the appropriate higher
- level protocol.</p>
-<p class="Pp">Each one of the end-points of an L2CAP channel is referred to by a
- channel identifier. Channel identifiers (CIDs) are local names representing
- a logical channel end-point on the device. Identifiers from 0x0001 to 0x003F
- are reserved for specific L2CAP functions. The null identifier (0x0000) is
- defined as an illegal identifier and must never be used as a destination
- end-point. All L2CAP signalling commands are sent to CID 0x0001. CID 0x0002
- is reserved for group-oriented channel. The same CID must not be reused as a
- local L2CAP channel endpoint for multiple simultaneous L2CAP channels
- between a local device and some remote device.</p>
-<p class="Pp">CID assignment is relative to a particular device and a device can
- assign CIDs independently from other devices. Thus, even if the same CID
- value has been assigned to (remote) channel endpoints by several remote
- devices connected to a single local device, the local device can still
- uniquely associate each remote CID with a different device.</p>
-<section class="Ss">
-<h2 class="Ss" id="Channel_Operational_States"><a class="permalink" href="#Channel_Operational_States">Channel
- Operational States</a></h2>
-<dl class="Bl-tag">
- <dt id="NG_L2CAP_CLOSED"><a class="permalink" href="#NG_L2CAP_CLOSED"><code class="Dv">NG_L2CAP_CLOSED</code></a></dt>
- <dd>In this state, there is no channel associated with this CID. This is the
- only state when a link level connection (Baseband) may not exist. Link
- disconnection forces all other states into the
- <code class="Dv">NG_L2CAP_CLOSED</code> state.</dd>
- <dt id="NG_L2CAP_W4_L2CAP_CON_RSP"><a class="permalink" href="#NG_L2CAP_W4_L2CAP_CON_RSP"><code class="Dv">NG_L2CAP_W4_L2CAP_CON_RSP</code></a></dt>
- <dd>In this state, the CID represents a local end-point and an L2CAP Connect
- Request message has been sent referencing this endpoint and it is now
- waiting for the corresponding L2CAP Connect Response message.</dd>
- <dt id="NG_L2CAP_W4_L2CA_CON_RSP"><a class="permalink" href="#NG_L2CAP_W4_L2CA_CON_RSP"><code class="Dv">NG_L2CAP_W4_L2CA_CON_RSP</code></a></dt>
- <dd>In this state, the remote end-point exists and an L2CAP Connect Request
- has been received by the local L2CAP entity. An L2CA Connect Indication
- has been sent to the upper layer and the part of the local L2CAP entity
- processing the received L2CAP Connect Request waits for the corresponding
- response. The response may require a security check to be performed.</dd>
- <dt id="NG_L2CAP_CONFIG"><a class="permalink" href="#NG_L2CAP_CONFIG"><code class="Dv">NG_L2CAP_CONFIG</code></a></dt>
- <dd>In this state, the connection has been established but both sides are
- still negotiating the channel parameters. The Configuration state may also
- be entered when the channel parameters are being renegotiated. Prior to
- entering the <code class="Dv">NG_L2CAP_CONFIG</code> state, all outgoing
- data traffic is suspended since the traffic parameters of the data traffic
- are to be renegotiated. Incoming data traffic is accepted until the remote
- channel endpoint has entered the <code class="Dv">NG_L2CAP_CONFIG</code>
- state. In the <code class="Dv">NG_L2CAP_CONFIG</code> state, both sides
- will issue L2CAP Configuration Request messages if only defaults are being
- used, a null message will be sent. If a large amount of parameters need to
- be negotiated, multiple messages will be sent to avoid any MTU limitations
- and negotiate incrementally. Moving from the
- <code class="Dv">NG_L2CAP_CONFIG</code> state to the
- <code class="Dv">NG_L2CAP_OPEN</code> state requires both sides to be
- ready. An L2CAP entity is ready when it has received a positive response
- to its final request and it has positively responded to the final request
- from the remote device.</dd>
- <dt id="NG_L2CAP_OPEN"><a class="permalink" href="#NG_L2CAP_OPEN"><code class="Dv">NG_L2CAP_OPEN</code></a></dt>
- <dd>In this state, the connection has been established and configured, and
- data flow may proceed.</dd>
- <dt id="NG_L2CAP_W4_L2CAP_DISCON_RSP"><a class="permalink" href="#NG_L2CAP_W4_L2CAP_DISCON_RSP"><code class="Dv">NG_L2CAP_W4_L2CAP_DISCON_RSP</code></a></dt>
- <dd>In this state, the connection is shutting down and an L2CAP Disconnect
- Request message has been sent. This state is now waiting for the
- corresponding response.</dd>
- <dt id="NG_L2CAP_W4_L2CA_DISCON_RSP"><a class="permalink" href="#NG_L2CAP_W4_L2CA_DISCON_RSP"><code class="Dv">NG_L2CAP_W4_L2CA_DISCON_RSP</code></a></dt>
- <dd>In this state, the connection on the remote endpoint is shutting down and
- an L2CAP Disconnect Request message has been received. An L2CA Disconnect
- Indication has been sent to the upper layer to notify the owner of the CID
- that the remote endpoint is being closed. This state is now waiting for
- the corresponding response from the upper layer before responding to the
- remote endpoint.</dd>
-</dl>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Protocol_Multiplexing"><a class="permalink" href="#Protocol_Multiplexing">Protocol
- Multiplexing</a></h2>
-<p class="Pp">L2CAP supports protocol multiplexing because the Baseband Protocol
- does not support any &#x201C;type&#x201D; field identifying the higher layer
- protocol being multiplexed above it. L2CAP is able to distinguish between
- upper layer protocols such as the Service Discovery Protocol, RFCOMM and
- Telephony Control.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Segmentation_and_Reassembly"><a class="permalink" href="#Segmentation_and_Reassembly">Segmentation
- and Reassembly</a></h2>
-<p class="Pp">The data packets defined by the Baseband Protocol are limited in
- size. Large L2CAP packets must be segmented into multiple smaller Baseband
- packets prior to their transmission over the air. Similarly, multiple
- received Baseband packets may be reassembled into a single larger L2CAP
- packet.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Quality_of_Service"><a class="permalink" href="#Quality_of_Service">Quality
- of Service</a></h2>
-<p class="Pp">The L2CAP connection establishment process allows the exchange of
- information regarding the quality of service (QoS) expected between two
- Bluetooth units.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Groups"><a class="permalink" href="#Groups">Groups</a></h2>
-<p class="Pp">The Baseband Protocol supports the concept of a piconet, a group
- of devices synchronously hopping together using the same clock. The L2CAP
- group abstraction permits implementations to efficiently map protocol groups
- on to piconets.</p>
-<p class="Pp">The following features are outside the scope of L2CAP
- responsibilities:</p>
-<ul class="Bl-dash Bd-indent">
- <li>L2CAP does not transport audio designated for SCO links.</li>
- <li>L2CAP does not enforce a reliable channel or ensure data integrity, that
- is, L2CAP performs no retransmissions or checksum calculations.</li>
- <li>L2CAP does not support a reliable multicast channel.</li>
- <li>L2CAP does not support the concept of a global group name.</li>
-</ul>
-</section>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HOOKS"><a class="permalink" href="#HOOKS">HOOKS</a></h1>
-<p class="Pp">This node type supports the following hooks:</p>
-<dl class="Bl-tag">
- <dt id="hci"><var class="Va">hci</var></dt>
- <dd>Bluetooth Host Controller Interface downstream hook.</dd>
- <dt id="l2c"><var class="Va">l2c</var></dt>
- <dd>Upper layer protocol upstream hook. Usually the Bluetooth L2CAP socket
- layer is connected to the hook.</dd>
- <dt id="ctl"><var class="Va">ctl</var></dt>
- <dd>Control hook. Usually the Bluetooth raw L2CAP sockets layer is connected
- to the hook.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="INTERFACE_TO_THE_UPPER_LAYER_PROTOCOLS_(L2CA_CONTROL_MESSAGES)"><a class="permalink" href="#INTERFACE_TO_THE_UPPER_LAYER_PROTOCOLS_(L2CA_CONTROL_MESSAGES)">INTERFACE
- TO THE UPPER LAYER PROTOCOLS (L2CA CONTROL MESSAGES)</a></h1>
-<p class="Pp">Bluetooth specification says that L2CA request must block until
- response is ready. L2CAP node uses <var class="Va">token</var> field from
- Netgraph message header to match L2CA request and response. The upper layer
- protocol must populate <var class="Va">token</var>. L2CAP node will queue
- request and start processing. Later, when response is ready or timeout has
- occurred, L2CAP node will create new Netgraph message, set
- <var class="Va">token</var> and <code class="Dv">NFG_RESP</code> flag and
- send message to the upper layer. Note that L2CA indication messages will not
- populate <var class="Va">token</var> and will not set
- <code class="Dv">NGF_RESP</code> flag. There is no reason for this, because
- they are just notifications and do not require acknowledgment.</p>
-<dl class="Bl-tag">
- <dt id="NGM_L2CAP_L2CA_CON"><a class="permalink" href="#NGM_L2CAP_L2CA_CON"><code class="Dv">NGM_L2CAP_L2CA_CON</code></a></dt>
- <dd>Requests the creation of a channel representing a logical connection to a
- physical address. Input parameters are the target protocol (PSM) and
- remote device's 48-bit address (BD_ADDR). Output parameters are the local
- CID (LCID) allocated by the local L2CAP entity, and Result of the request.
- If Result indicates a pending notification, the Status value may contain
- more information of what processing is delaying the establishment of the
- connection.</dd>
- <dt id="NGM_L2CAP_L2CA_CON_IND"><a class="permalink" href="#NGM_L2CAP_L2CA_CON_IND"><code class="Dv">NGM_L2CAP_L2CA_CON_IND</code></a></dt>
- <dd>This message includes the parameters for the address of the remote device
- that issued the connection request, the local CID representing the channel
- being requested, the Identifier contained in the request, and the PSM
- value the request is targeting.</dd>
- <dt id="NGM_L2CAP_L2CA_CON_RSP"><a class="permalink" href="#NGM_L2CAP_L2CA_CON_RSP"><code class="Dv">NGM_L2CAP_L2CA_CON_RSP</code></a></dt>
- <dd>Issues a response to a connection request event indication. Input
- parameters are the remote device's 48-bit address, Identifier sent in the
- request, local CID, the Response code, and the Status attached to the
- Response code. The output parameter is the Result of the service request.
- This primitive must be called no more than once after receiving the
- indication.</dd>
- <dt id="NGM_L2CAP_L2CA_CFG"><a class="permalink" href="#NGM_L2CAP_L2CA_CFG"><code class="Dv">NGM_L2CAP_L2CA_CFG</code></a></dt>
- <dd>Requests the initial configuration (or reconfiguration) of a channel to a
- new set of channel parameters. Input parameters are the local CID
- endpoint, new incoming receivable MTU (InMTU), new outgoing flow
- spec-ification, and flush and link timeouts. Output parameters are the
- Result, accepted incoming MTU (InMTU), the remote side's flow requests,
- and flush and link timeouts.</dd>
- <dt id="NGM_L2CAP_L2CA_CFG_IND"><a class="permalink" href="#NGM_L2CAP_L2CA_CFG_IND"><code class="Dv">NGM_L2CAP_L2CA_CFG_IND</code></a></dt>
- <dd>This message includes the parameters indicating the local CID of the
- channel the request has been sent to, the outgoing MTU size (maximum
- packet that can be sent across the channel) and the flowspec describing
- the characteristics of the incoming data. All other channel parameters are
- set to their default values if not provided by the remote device.</dd>
- <dt id="NGM_L2CAP_L2CA_CFG_RSP"><a class="permalink" href="#NGM_L2CAP_L2CA_CFG_RSP"><code class="Dv">NGM_L2CAP_L2CA_CFG_RSP</code></a></dt>
- <dd>Issues a response to a configuration request event indication. Input
- parameters include the local CID of the endpoint being configured,
- outgoing transmit MTU (which may be equal or less to the OutMTU parameter
- in the configuration indication event) and the accepted flowspec for
- incoming traffic. The output parameter is the Result value.</dd>
- <dt id="NGM_L2CAP_L2CA_QOS_IND"><a class="permalink" href="#NGM_L2CAP_L2CA_QOS_IND"><code class="Dv">NGM_L2CAP_L2CA_QOS_IND</code></a></dt>
- <dd>This message includes the parameter indicating the address of the remote
- Bluetooth device where the QoS contract has been violated.</dd>
- <dt id="NGM_L2CAP_L2CA_DISCON"><a class="permalink" href="#NGM_L2CAP_L2CA_DISCON"><code class="Dv">NGM_L2CAP_L2CA_DISCON</code></a></dt>
- <dd>Requests the disconnection of the channel. Input parameter is the CID
- representing the local channel endpoint. Output parameter is Result.
- Result is zero if an L2CAP Disconnect Response is received, otherwise a
- non-zero value is returned. Once disconnection has been requested, no
- process will be able to successfully read or write from the CID.</dd>
- <dt id="NGM_L2CAP_L2CA_DISCON_IND"><a class="permalink" href="#NGM_L2CAP_L2CA_DISCON_IND"><code class="Dv">NGM_L2CAP_L2CA_DISCON_IND</code></a></dt>
- <dd>This message includes the parameter indicating the local CID the request
- has been sent to.</dd>
- <dt id="NGM_L2CAP_L2CA_WRITE"><a class="permalink" href="#NGM_L2CAP_L2CA_WRITE"><code class="Dv">NGM_L2CAP_L2CA_WRITE</code></a></dt>
- <dd>Response to transfer of data request. Actual data must be received from
- appropriate upstream hook and must be prepended with header defined as
- follows.
- <div class="Bd Pp Bd-indent Li">
- <pre>/* L2CA data packet header */
-typedef struct {
- uint32_t token; /* token to use in L2CAP_L2CA_WRITE */
- uint16_t length; /* length of the data */
- uint16_t lcid; /* local channel ID */
-} __attribute__ ((packed)) ng_l2cap_l2ca_hdr_t;</pre>
- </div>
- <p class="Pp">The output parameters are Result and Length of data
- written.</p>
- </dd>
- <dt id="NGM_L2CAP_L2CA_GRP_CREATE"><a class="permalink" href="#NGM_L2CAP_L2CA_GRP_CREATE"><code class="Dv">NGM_L2CAP_L2CA_GRP_CREATE</code></a></dt>
- <dd>Requests the creation of a CID to represent a logical connection to
- multiple devices. Input parameter is the PSM value that the outgoing
- connectionless traffic is labelled with, and the filter used for incoming
- traffic. Output parameter is the CID representing the local endpoint. On
- creation, the group is empty but incoming traffic destined for the PSM
- value is readable.
- <div class="Bf Em">This request has not been implemented.</div>
- </dd>
- <dt id="NGM_L2CAP_L2CA_GRP_CLOSE"><a class="permalink" href="#NGM_L2CAP_L2CA_GRP_CLOSE"><code class="Dv">NGM_L2CAP_L2CA_GRP_CLOSE</code></a></dt>
- <dd>The use of this message closes down a Group.
- <div class="Bf Em">This request has not been implemented.</div>
- </dd>
- <dt id="NGM_L2CAP_L2CA_GRP_ADD_MEMBER"><a class="permalink" href="#NGM_L2CAP_L2CA_GRP_ADD_MEMBER"><code class="Dv">NGM_L2CAP_L2CA_GRP_ADD_MEMBER</code></a></dt>
- <dd>Requests the addition of a member to a group. The input parameter includes
- the CID representing the group and the BD_ADDR of the group member to be
- added. The output parameter Result confirms the success or failure of the
- request.
- <div class="Bf Em">This request has not been implemented.</div>
- </dd>
- <dt id="NGM_L2CAP_L2CA_GRP_REM_MEMBER"><a class="permalink" href="#NGM_L2CAP_L2CA_GRP_REM_MEMBER"><code class="Dv">NGM_L2CAP_L2CA_GRP_REM_MEMBER</code></a></dt>
- <dd>Requests the removal of a member from a group. The input parameters
- include the CID representing the group and BD_ADDR of the group member to
- be removed. The output parameter Result confirms the success or failure of
- the request.
- <div class="Bf Em">This request has not been implemented.</div>
- </dd>
- <dt id="NGM_L2CAP_L2CA_GRP_MEMBERSHIP"><a class="permalink" href="#NGM_L2CAP_L2CA_GRP_MEMBERSHIP"><code class="Dv">NGM_L2CAP_L2CA_GRP_MEMBERSHIP</code></a></dt>
- <dd>Requests a report of the members of a group. The input parameter CID
- represents the group being queried. The output parameter Result confirms
- the success or failure of the operation. If the Result is successful,
- BD_ADDR_Lst is a list of the Bluetooth addresses of the N members of the
- group.
- <div class="Bf Em">This request has not been implemented.</div>
- </dd>
- <dt id="NGM_L2CAP_L2CA_PING"><a class="permalink" href="#NGM_L2CAP_L2CA_PING"><code class="Dv">NGM_L2CAP_L2CA_PING</code></a></dt>
- <dd>Initiates an L2CA Echo Request message and the reception of the
- corresponding L2CAP Echo Response message. The input parameters are remote
- Bluetooth device BD_ADDR, Echo Data and Length of the echo data. The
- output parameters are Result, Echo Data and Length of the echo data.</dd>
- <dt id="NGM_L2CAP_L2CA_GET_INFO"><a class="permalink" href="#NGM_L2CAP_L2CA_GET_INFO"><code class="Dv">NGM_L2CAP_L2CA_GET_INFO</code></a></dt>
- <dd>Initiates an L2CA Information Request message and the reception of the
- corresponding L2CAP Info Response message. The input parameters are remote
- Bluetooth device BD_ADDR and Information Type. The output parameters are
- Result, Information Data and Size of the information data.</dd>
- <dt id="NGM_L2CAP_L2CA_ENABLE_CLT"><a class="permalink" href="#NGM_L2CAP_L2CA_ENABLE_CLT"><code class="Dv">NGM_L2CAP_L2CA_ENABLE_CLT</code></a></dt>
- <dd>Request to disable (enable) the reception of connectionless packets. The
- input parameter is the PSM value indicating service that should be blocked
- (unblocked) and Enable flag.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="NETGRAPH_CONTROL_MESSAGES"><a class="permalink" href="#NETGRAPH_CONTROL_MESSAGES">NETGRAPH
- CONTROL MESSAGES</a></h1>
-<p class="Pp">This node type supports the generic control messages, plus the
- following:</p>
-<dl class="Bl-tag">
- <dt id="NGM_L2CAP_NODE_GET_FLAGS"><a class="permalink" href="#NGM_L2CAP_NODE_GET_FLAGS"><code class="Dv">NGM_L2CAP_NODE_GET_FLAGS</code></a></dt>
- <dd>Returns current state for the node.</dd>
- <dt id="NGM_L2CAP_NODE_GET_DEBUG"><a class="permalink" href="#NGM_L2CAP_NODE_GET_DEBUG"><code class="Dv">NGM_L2CAP_NODE_GET_DEBUG</code></a></dt>
- <dd>Returns an integer containing the current debug level for the node.</dd>
- <dt id="NGM_L2CAP_NODE_SET_DEBUG"><a class="permalink" href="#NGM_L2CAP_NODE_SET_DEBUG"><code class="Dv">NGM_L2CAP_NODE_SET_DEBUG</code></a></dt>
- <dd>This command takes an integer argument and sets current debug level for
- the node.</dd>
- <dt id="NGM_L2CAP_NODE_GET_CON_LIST"><a class="permalink" href="#NGM_L2CAP_NODE_GET_CON_LIST"><code class="Dv">NGM_L2CAP_NODE_GET_CON_LIST</code></a></dt>
- <dd>Returns list of active baseband connections (i.e., ACL links).</dd>
- <dt id="NGM_L2CAP_NODE_GET_CHAN_LIST"><a class="permalink" href="#NGM_L2CAP_NODE_GET_CHAN_LIST"><code class="Dv">NGM_L2CAP_NODE_GET_CHAN_LIST</code></a></dt>
- <dd>Returns list of active L2CAP channels.</dd>
- <dt id="NGM_L2CAP_NODE_GET_AUTO_DISCON_TIMO"><a class="permalink" href="#NGM_L2CAP_NODE_GET_AUTO_DISCON_TIMO"><code class="Dv">NGM_L2CAP_NODE_GET_AUTO_DISCON_TIMO</code></a></dt>
- <dd>Returns an integer containing the current value of the auto disconnect
- timeout (in sec).</dd>
- <dt id="NGM_L2CAP_NODE_SET_AUTO_DISCON_TIMO"><a class="permalink" href="#NGM_L2CAP_NODE_SET_AUTO_DISCON_TIMO"><code class="Dv">NGM_L2CAP_NODE_SET_AUTO_DISCON_TIMO</code></a></dt>
- <dd>This command accepts an integer and sets the value of the auto disconnect
- timeout (in sec). The special value of 0 (zero) disables auto disconnect
- timeout.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SHUTDOWN"><a class="permalink" href="#SHUTDOWN">SHUTDOWN</a></h1>
-<p class="Pp">This node shuts down upon receipt of an
- <code class="Dv">NGM_SHUTDOWN</code> control message, or when all hooks have
- been disconnected.</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">netgraph(4)</a>, <a class="Xr">l2control(8)</a>,
- <a class="Xr">l2ping(8)</a>, <a class="Xr">ngctl(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">l2cap</code> node type was implemented in
- <span class="Ux">FreeBSD 5.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="An">Maksim Yevmenkin</span>
- &lt;<a class="Mt" href="mailto:m_evmenkin@yahoo.com">m_evmenkin@yahoo.com</a>&gt;</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Most likely. Please report if found.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">July 4, 2002</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>