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Diffstat (limited to 'man/man8/tc-tunnel_key.8')
| -rw-r--r-- | man/man8/tc-tunnel_key.8 | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/man/man8/tc-tunnel_key.8 b/man/man8/tc-tunnel_key.8 new file mode 100644 index 00000000..e979a747 --- /dev/null +++ b/man/man8/tc-tunnel_key.8 @@ -0,0 +1,136 @@ +.TH "Tunnel metadata manipulation action in tc" 8 "10 Nov 2016" "iproute2" "Linux" + +.SH NAME +tunnel_key - Tunnel metadata manipulation +.SH SYNOPSIS +.in +8 +.ti -8 +.BR tc " ... " "action tunnel_key" " { " unset " | " +.IR SET " }" + +.ti -8 +.IR SET " := " +.BR set " " src_ip +.IR ADDRESS +.BR dst_ip +.IR ADDRESS +.BI id " KEY_ID" +.BI dst_port " UDP_PORT" +.RB "[ " csum " | " nocsum " ]" + +.SH DESCRIPTION +The +.B tunnel_key +action combined with a shared IP tunnel device, allows to perform IP tunnel en- +or decapsulation on a packet, reflected by +the operation modes +.IR UNSET " and " SET . +The +.I UNSET +mode is optional - even without using it, the metadata information will be +released automatically when packet processing will be finished. +.IR UNSET +function could be used in cases when traffic is forwarded between two tunnels, +where the metadata from the first tunnel will be used for encapsulation done by +the second tunnel. +.IR SET +mode requires the source and destination ip +.I ADDRESS +and the tunnel key id +.I KEY_ID +which will be used by the ip tunnel shared device to create the tunnel header. The +.B tunnel_key +action is useful only in combination with a +.B mirred redirect +action to a shared IP tunnel device which will use the metadata (for +.I SET +) and unset the metadata created by it (for +.I UNSET +). + +.SH OPTIONS +.TP +.B unset +Unset the tunnel metadata created by the IP tunnel device. This function is +not mandatory and might be used only in some specific use cases (as explained +above). +.TP +.B set +Set tunnel metadata to be used by the IP tunnel device. Requires +.B id +, +.B src_ip +and +.B dst_ip +options. +.B dst_port +is optional. +.RS +.TP +.B id +Tunnel ID (for example VNI in VXLAN tunnel) +.TP +.B src_ip +Outer header source IP address (IPv4 or IPv6) +.TP +.B dst_ip +Outer header destination IP address (IPv4 or IPv6) +.TP +.B dst_port +Outer header destination UDP port +.TP +.RB [ no ] csum +Controlls outer UDP checksum. When set to +.B csum +(which is default), the outer UDP checksum is calculated and included in the +packets. When set to +.BR nocsum , +outer UDP checksum is zero. Note that when using zero UDP checksums with +IPv6, the other tunnel endpoint must be configured to accept such packets. +In Linux, this would be the +.B udp6zerocsumrx +option for the VXLAN tunnel interface. +.IP +If using +.B nocsum +with IPv6, be sure you know what you are doing. Zero UDP checksums provide +weaker protection against corrupted packets. See RFC6935 for details. +.RE +.SH EXAMPLES +The following example encapsulates incoming ICMP packets on eth0 into a vxlan +tunnel, by setting metadata to VNI 11, source IP 11.11.0.1 and destination IP +11.11.0.2, and by redirecting the packet with the metadata to device vxlan0, +which will do the actual encapsulation using the metadata: + +.RS +.EX +#tc qdisc add dev eth0 handle ffff: ingress +#tc filter add dev eth0 protocol ip parent ffff: \\ + flower \\ + ip_proto icmp \\ + action tunnel_key set \\ + src_ip 11.11.0.1 \\ + dst_ip 11.11.0.2 \\ + id 11 \\ + action mirred egress redirect dev vxlan0 +.EE +.RE + +Here is an example of the +.B unset +function: Incoming VXLAN traffic with outer IP's and VNI 11 is decapsulated by +vxlan0 and metadata is unset before redirecting to tunl1 device: + +.RS +.EX +#tc qdisc add dev eth0 handle ffff: ingress +#tc filter add dev vxlan0 protocol ip parent ffff: \ + flower \\ + enc_src_ip 11.11.0.2 enc_dst_ip 11.11.0.1 enc_key_id 11 \ + action tunnel_key unset \ + action mirred egress redirect dev tunl1 +.EE +.RE + +.SH SEE ALSO +.BR tc (8) |