123 lines
3.6 KiB
Groff
123 lines
3.6 KiB
Groff
.\" Copyright (c) 2004 Gleb Smirnoff
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 14, 2019
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.Dt NG_EIFACE 4
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.Os
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.Sh NAME
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.Nm ng_eiface
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.Nd "generic Ethernet interface netgraph node type"
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.Sh SYNOPSIS
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.In netgraph/ng_eiface.h
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.Sh DESCRIPTION
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The
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.Vt eiface
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netgraph node implements the generic Ethernet interface.
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When an
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.Vt eiface
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node is created, a new interface appears which is accessible via
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.Xr ifconfig 8 .
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These interfaces are named
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.Dq Li ngeth0 ,
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.Dq Li ngeth1 ,
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etc.
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When a node is shut down, the corresponding interface is removed,
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and the interface name becomes available for reuse by future
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.Vt eiface
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nodes.
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New nodes always take the first unused interface.
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.Sh HOOKS
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An
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.Vt eiface
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node has a single hook named
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.Va ether ,
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which should be connected to the
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Ethernet downstream, for example, to the
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.Xr ng_vlan 4
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node.
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Packets transmitted via the interface flow out this hook.
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Similarly, packets received on the hook go to the protocol stack as
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packets received by any real Ethernet interface.
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_EIFACE_SET Pq Ic set
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Set link-level address of the interface.
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Requires
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.Vt "struct ether_addr"
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as an argument.
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This message also has an
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.Tn ASCII
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version, called
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.Dq Li set ,
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which requires as an argument an
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.Tn ASCII
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string consisting of 6 colon-separated hex digits.
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.It Dv NGM_EIFACE_GET_IFNAME Pq Ic getifname
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Return the name of the associated interface as a
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.Dv NULL Ns -terminated
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.Tn ASCII
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string.
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.It Dv NGM_EIFACE_GET_IFADDRS
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Return the list of link-level addresses associated with the node.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message.
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The associated interface is removed and its name becomes
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available for reuse by future
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.Vt eiface
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nodes.
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.Pp
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Unlike most other node types, an
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.Vt eiface
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node does
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.Em not
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go away when all hooks have been disconnected; rather, an explicit
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.Dv NGM_SHUTDOWN
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control message is required.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_ether 4 ,
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.Xr ng_iface 4 ,
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.Xr ng_vlan 4 ,
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.Xr ifconfig 8 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Vt eiface
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node type was implemented in
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.Fx 4.6 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Vt eiface
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node type was written by
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.An Vitaly V Belekhov .
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This manual page was written by
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.An Gleb Smirnoff .
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