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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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VLAN manipulation action in tc(8) LinuxVLAN manipulation action in tc(8)
vlan - vlan manipulation module
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 }
The vlan action allows one 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 one 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.
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.
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).
tc(8), tc-mpls(8)
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to [email protected]
iproute2 12 Jan 20V1L5AN manipulation action in tc(8)
Pages that refer to this page: tc-actions(8), tc-mpls(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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