VLAN manipulation action in tc((81)2nVL2A0N15m)anipulation action in tc(8)

     NAME
          vlan - vlan manipulation module

     SYNOPSIS
          tc ... action vlan { pop | PUSH | MODIFY | PUSH_ETH } [

          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 |

     DESCRIPTION
          The vlan action allows to perform 802.1Q en- or decapsula-
          tion on a packet, reflected by the operation modes POP, PUSH
          and MODIFY.  The POP mode is simple, as no further informa-
          tion is required to just drop the outer-most VLAN encapsula-
          tion. 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 opera-
          tion, 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 result-
          ing 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

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     VLAN manipulation action in tc((81)2nVL2A0N15m)anipulation action in tc(8)

               first.

          push_eth
               Ethernet header encapsulation mode. The Ethertype is
               automatically set using the network header type. Chain-
               ing 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 automat-
               ically (e.g. prefix with '0x' for hexadecimal interpre-
               tation, etc.).

          protocol VLANPROTO
               Choose the VLAN protocol to use. At the time of writ-
               ing, 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:

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               #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 pack-
          ets 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)

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