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| -rw-r--r-- | man/man8/tc-vlan.8 | 164 |
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diff --git a/man/man8/tc-vlan.8 b/man/man8/tc-vlan.8 new file mode 100644 index 0000000..e199c9a --- /dev/null +++ b/man/man8/tc-vlan.8 @@ -0,0 +1,164 @@ +.TH "VLAN manipulation action in tc" 8 "12 Jan 2015" "iproute2" "Linux" + +.SH NAME +vlan - vlan manipulation module +.SH SYNOPSIS +.in +8 +.ti -8 +.BR tc " ... " "action vlan" " { " pop " | " pop_eth " |" +.IR PUSH " | " MODIFY " | " PUSH_ETH " } [ " CONTROL " ]" + +.ti -8 +.IR PUSH " := " +.BR push " [ " protocol +.IR VLANPROTO " ]" +.BR " [ " priority +.IR VLANPRIO " ] " +.BI id " VLANID" + +.ti -8 +.IR MODIFY " := " +.BR modify " [ " protocol +.IR VLANPROTO " ]" +.BR " [ " priority +.IR VLANPRIO " ] " +.BI id " VLANID" + +.ti -8 +.IR PUSH_ETH " := " +.B push_eth +.BI dst_mac " LLADDR " src_mac " LLADDR " + +.ti -8 +.IR CONTROL " := { " +.BR reclassify " | " pipe " | " drop " | " continue " | " pass " | " goto " " chain " " CHAIN_INDEX " }" +.SH DESCRIPTION +The +.B vlan +action allows one to perform 802.1Q en- or decapsulation on a packet, reflected by +the operation modes +.IR POP ", " PUSH " and " MODIFY . +The +.I POP +mode is simple, as no further information is required to just drop the +outer-most VLAN encapsulation. The +.IR PUSH " and " MODIFY +modes require at least a +.I VLANID +and allow one to optionally choose the +.I VLANPROTO +to use. + +The +.B vlan +action can also be used to add or remove the base Ethernet header. The +.B 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 +.B 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. + +.SH OPTIONS +.TP +.B pop +Decapsulation mode, no further arguments allowed. +.TP +.B push +Encapsulation mode. Requires at least +.B id +option. +.TP +.B modify +Replace mode. Existing 802.1Q tag is replaced. Requires at least +.B id +option. +.TP +.B pop_eth +Ethernet header decapsulation mode. Only works on a plain Ethernet header: +VLANs, if any, must be removed first. +.TP +.B 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 +.BR "dst_mac " and " src_mac " options. +.TP +.BI id " VLANID" +Specify the VLAN ID to encapsulate into. +.I VLANID +is an unsigned 16bit integer, the format is detected automatically (e.g. prefix +with +.RB ' 0x ' +for hexadecimal interpretation, etc.). +.TP +.BI protocol " VLANPROTO" +Choose the VLAN protocol to use. At the time of writing, the kernel accepts only +.BR 802.1Q " or " 802.1ad . +.TP +.BI priority " VLANPRIO" +Choose the VLAN priority to use. Decimal number in range of 0-7. +.TP +.BI dst_mac " LLADDR" +Choose the destination MAC address to use. +.TP +.BI src_mac " LLADDR" +Choose the source MAC address to use. +.TP +.I CONTROL +How to continue after executing this action. +.RS +.TP +.B reclassify +Restarts classification by jumping back to the first filter attached to this +action's parent. +.TP +.B pipe +Continue with the next action, this is the default. +.TP +.B drop +Packet will be dropped without running further actions. +.TP +.B continue +Continue classification with next filter in line. +.TP +.B pass +Return to calling qdisc for packet processing. This ends the classification +process. +.RE +.SH EXAMPLES +The following example encapsulates incoming ICMP packets on eth0 from 10.0.0.2 +into VLAN ID 123: + +.RS +.EX +#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 +.EE +.RE + +Here is an example of the +.B pop +function: Incoming VLAN packets on eth0 are decapsulated and the classification +process then restarted for the plain packet: + +.RS +.EX +#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 +.EE +.RE + +For an example of the +.BR pop_eth " and " push_eth " modes, see " tc-mpls (8). + +.SH SEE ALSO +.BR tc "(8), " tc-mpls (8) |