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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 corresponding
     ``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 unmodified 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>