NAME

       vlan - vlan manipulation module

SYNOPSIS

       tc ... action vlan { pop | pop_eth | PUSH | MODIFY | PUSH_ETH } [ CONTROL ]

       PUSH := push [ protocol VLANPROTO ]  [ priority VLANPRIO ] id VLANID

       MODIFY := modify [ protocol VLANPROTO ]  [ priority VLANPRIO ] id VLANID

       PUSH_ETH := push_eth dst_mac LLADDR src_mac LLADDR

       CONTROL := { reclassify | pipe | drop | continue | pass | goto chain CHAIN_INDEX }

DESCRIPTION

       The  vlan  action  allows to perform 802.1Q en- or decapsulation on a packet, reflected by
       the operation modes POP, PUSH  and  MODIFY.   The  POP  mode  is  simple,  as  no  further
       information  is  required  to  just  drop  the outer-most VLAN encapsulation. The PUSH and
       MODIFY modes require at least a VLANID and allow to optionally  choose  the  VLANPROTO  to
       use.

       The  vlan  action  can also be used to add or remove the base Ethernet header. The pop_eth
       mode, which takes no argument, is used to remove the base Ethernet  header.  All  existing
       VLANs  must  have  been previously dropped. The opposite operation, adding a base Ethernet
       header, is done with the push_eth mode. In that case, the packet must have no  MAC  header
       (stacking MAC headers is not permitted). This mode is mostly useful when a previous action
       has encapsulated the whole original frame behind a network header and one needs to prepend
       an Ethernet header before forwarding the resulting packet.

OPTIONS

       pop    Decapsulation mode, no further arguments allowed.

       push   Encapsulation mode. Requires at least id option.

       modify Replace mode. Existing 802.1Q tag is replaced. Requires at least id option.

       pop_eth
              Ethernet  header  decapsulation mode. Only works on a plain Ethernet header: VLANs,
              if any, must be removed first.

       push_eth
              Ethernet header encapsulation mode. The Ethertype is automatically  set  using  the
              network header type. Chaining Ethernet headers is not allowed: the packet must have
              no MAC header when using this mode. Requires the dst_mac and src_mac options.

       id VLANID
              Specify the VLAN ID to encapsulate into.  VLANID is an unsigned 16bit integer,  the
              format   is   detected   automatically  (e.g.  prefix  with  '0x'  for  hexadecimal
              interpretation, etc.).

       protocol VLANPROTO
              Choose the VLAN protocol to use. At the time of writing, the  kernel  accepts  only
              802.1Q or 802.1ad.

       priority VLANPRIO
              Choose the VLAN priority to use. Decimal number in range of 0-7.

       dst_mac LLADDR
              Choose the destination MAC address to use.

       src_mac LLADDR
              Choose the source MAC address to use.

       CONTROL
              How to continue after executing this action.

              reclassify
                     Restarts classification by jumping back to the first filter attached to this
                     action's parent.

              pipe   Continue with the next action, this is the default.

              drop   Packet will be dropped without running further actions.

              continue
                     Continue classification with next filter in line.

              pass   Return to calling qdisc for packet processing. This ends the  classification
                     process.

EXAMPLES

       The  following  example encapsulates incoming ICMP packets on eth0 from 10.0.0.2 into VLAN
       ID 123:

              #tc qdisc add dev eth0 handle ffff: ingress
              #tc filter add dev eth0 parent ffff: pref 11 protocol ip \
                   u32 match ip protocol 1 0xff flowid 1:1 \
                       match ip src 10.0.0.2 flowid 1:1 \
                   action vlan push id 123

       Here is an example of the pop function: Incoming VLAN packets on eth0 are decapsulated and
       the classification process then restarted for the plain packet:

              #tc qdisc add dev eth0 handle ffff: ingress
              #tc filter add dev $ETH parent ffff: pref 1 protocol 802.1Q \
                   u32 match u32 0 0 flowid 1:1 \
                   action vlan pop reclassify

       For an example of the pop_eth and push_eth modes, see tc-mpls(8).

SEE ALSO

       tc(8), tc-mpls(8)