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d491a3480f
Signed-off-by: Lucas Bates <lucasb@mojatatu.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
141 lines
3.3 KiB
Groff
141 lines
3.3 KiB
Groff
.TH "IFE action in tc" 8 "22 Apr 2016" "iproute2" "Linux"
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.SH NAME
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IFE - encapsulate/decapsulate metadata
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.SH SYNOPSIS
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.in +8
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.ti -8
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.BR tc " ... " " action ife"
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.IR DIRECTION " [ " ACTION " ] "
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.RB "[ " dst
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.IR DMAC " ] "
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.RB "[ " src
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.IR SMAC " ] "
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.RB "[ " type
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.IR TYPE " ] "
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.R "[ "
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.IR CONTROL " ] "
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.RB "[ " index
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.IR INDEX " ] "
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.ti -8
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.IR DIRECTION " := { "
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.BR decode " | " encode " }"
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.ti -8
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.IR ACTION " := { "
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.BI allow " ATTR"
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.RB "| " use
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.IR "ATTR value" " }"
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.ti -8
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.IR ATTR " := { "
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.BR mark " | " prio " | " tcindex " }"
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.ti -8
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.IR CONTROL " := { "
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.BR reclassify " | " use " | " pipe " | " drop " | " continue " | " ok " }"
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.SH DESCRIPTION
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The
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.B ife
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action allows for a sending side to encapsulate arbitrary metadata, which is
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then decapsulated by the receiving end. The sender runs in encoding mode and
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the receiver in decode mode. Both sender and receiver must specify the same
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ethertype. In the future, a registered ethertype may be available as a default.
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.SH OPTIONS
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.TP
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.B decode
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For the receiving side; decode the metadata if the packet matches.
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.TP
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.B encode
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For the sending side. Encode the specified metadata if the packet matches.
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.TP
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.B allow
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Encode direction only. Allows encoding specified metadata.
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.TP
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.B use
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Encode direction only. Enforce static encoding of specified metadata.
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.TP
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.BR mark " [ "
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.IR u32_value " ]"
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The value to set for the skb mark. The u32 value is required only when
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.BR use " is specified."
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.TP
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.BR prio " [ "
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.IR u32_value " ]"
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The value to set for priority in the skb structure. The u32 value is required
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only when
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.BR use " is specified."
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.TP
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.BR tcindex " ["
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.IR u16_value " ]"
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Value to set for the traffic control index in the skb structure. The u16 value
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is required only when
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.BR use " is specified."
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.TP
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.BI dmac " DMAC"
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.TQ
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.BI smac " SMAC"
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Optional six byte destination or source MAC address to encode.
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.TP
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.BI type " TYPE"
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Optional 16-bit ethertype to encode.
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.TP
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.BI CONTROL
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Action to take following an encode/decode.
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.TP
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.BI index " INDEX"
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Assign a unique ID to this action instead of letting the kernel choose one
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automatically.
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.I INDEX
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is a 32bit unsigned integer greater than zero.
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.SH EXAMPLES
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On the receiving side, match packets with ethertype 0xdead and restart
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classification so that it will match ICMP on the next rule, at prio 3:
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.RS
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.EX
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# tc qdisc add dev eth0 handle ffff: ingress
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# tc filter add dev eth0 parent ffff: prio 2 protocol 0xdead \\
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u32 match u32 0 0 flowid 1:1 \\
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action ife decode reclassify
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# tc filter add dev eth0 parent ffff: priod 3 protocol ip \\
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u32 match ip protocol 0xff flowid 1:1 \\
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action continue
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.EE
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.RE
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Match with skb mark of 17:
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.RS
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.EX
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# tc filter add dev eth0 parent ffff: prio 4 protocol ip \\
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handle 0x11 fw flowid 1:1 \\
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action ok
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.EE
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.RE
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Configure the sending side to encode for the filters above. Use a destination
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IP address of 192.168.122.237/24, then tag with skb mark of decimal 17. Encode
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the packaet with ethertype 0xdead, add skb->mark to whitelist of metadatum to
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send, and rewrite the destination MAC address to 02:15:15:15:15:15.
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.RS
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.EX
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# tc qdisc add dev eth0 root handle 1: prio
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# tc filter add dev eth0 parent 1: protocol ip prio 10 u32 \\
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match ip dst 192.168.122.237/24 \\
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match ip protocol 1 0xff \\
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flowid 1:2 \\
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action skbedit mark 17 \\
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action ife encode \\
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type 0xDEAD \\
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allow mark \\
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dst 02:15:15:15:15:15
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.EE
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.RE
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.SH SEE ALSO
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.BR tc (8),
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.BR tc-u32 (8)
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