ng_vlan(4)

NAME

ng_vlan - IEEE 802.1Q VLAN tagging netgraph node type

SYNOPSIS

#include <sys/types.h>
#include <netgraph.h>
#include <netgraph/ng_vlan.h>

DESCRIPTION

The vlan node type multiplexes frames tagged according to

the IEEE 802.1Q
standard between different hooks.

Each node has two special hooks, downstream and nomatch, and

an arbitrary
number of ``vlan'' hooks, each associated with a particular

VLAN tag.

An ETHERTYPE_VLAN frame received on the downstream hook with

a tag that
the node has been configured to filter is sent out the cor

responding
``vlan'' hook. If it does not match any of the configured

tags, or is
not of a type ETHERTYPE_VLAN, it is sent out the nomatch

hook. If the
nomatch hook is not connected, the packet is dropped.

An Ethernet frame received on the nomatch hook is passed un

modified to
the downstream hook.

An Ethernet frame received on any of the ``vlan'' hooks is

tagged accordingly and sent out the downstream hook.

HOOKS

This node type supports the following hooks:

downstream Typically this hook would be connected to a

ng_ether(4)

node, using the lower hook.

nomatch Typically this hook would also be connected

to an

ng_ether(4) type node using the upper hook.

<any valid name>

Any other hook name will be accepted and

should later be
associated with a particular tag. Typically

this hook
would be attached to an ng_eiface(4) type

node using the
ether hook.

CONTROL MESSAGES

This node type supports the generic control messages, plus

the following:

NGM_VLAN_ADD_FILTER (addfilter)

Associates a hook with the tag.

NGM_VLAN_DEL_FILTER (delfilter)

Disassociates a hook from the tag.

NGM_VLAN_GET_TABLE (gettable)

Returns a table of all hook/tag associations.

EXAMPLES

#!/bin/sh

ETHER_IF=rl0

ngctl -f- <<EOF
shutdown ${ETHER_IF}:
mkpeer ${ETHER_IF}: vlan lower downstream
name ${ETHER_IF}:lower vlan
connect ${ETHER_IF}: vlan: upper nomatch
EOF

ngctl mkpeer vlan: eiface vlan123 ether
ngctl msg vlan: addfilter '{ vlan=123 hook="vlan123" }'

SHUTDOWN

This node shuts down upon receipt of a NGM_SHUTDOWN control

message, or
when all hooks have been disconnected.

SEE ALSO

netgraph(4), ng_eiface(4), ng_ether(4), ngctl(8), nghook(8)

HISTORY

The ng_vlan node type appeared in FreeBSD 4.10.

AUTHORS

Ruslan Ermilov <ru@FreeBSD.org>

BSD March 1, 2004

BSD