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⟩