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tc-ife(8) [osx man page]

IFE action in tc(8)						       Linux						       IFE action in tc(8)

NAME
IFE - encapsulate/decapsulate metadata SYNOPSIS
tc ... action ife DIRECTION [ ACTION ] [ dst DMAC ] [ src SMAC ] [ type TYPE ] [ CONTROL ] [ index INDEX ] DIRECTION := { decode | encode } ACTION := { allow ATTR | use ATTR value } ATTR := { mark | prio | tcindex } CONTROL := { reclassify | use | pipe | drop | continue | ok | goto chain CHAIN_INDEX } DESCRIPTION
The ife action allows for a sending side to encapsulate arbitrary metadata, which is then decapsulated by the receiving end. The sender runs in encoding mode and the receiver in decode mode. Both sender and receiver must specify the same ethertype. In the future, a regis- tered ethertype may be available as a default. OPTIONS
decode For the receiving side; decode the metadata if the packet matches. encode For the sending side. Encode the specified metadata if the packet matches. allow Encode direction only. Allows encoding specified metadata. use Encode direction only. Enforce static encoding of specified metadata. mark [ u32_value ] The value to set for the skb mark. The u32 value is required only when use is specified. If mark value is zero, it will not be encoded, instead "overlimits" statistics increment and CONTROL action is taken. prio [ u32_value ] The value to set for priority in the skb structure. The u32 value is required only when use is specified. tcindex [ u16_value ] Value to set for the traffic control index in the skb structure. The u16 value is required only when use is specified. dmac DMAC smac SMAC Optional six byte destination or source MAC address to encode. type TYPE Optional 16-bit ethertype to encode. If not specified value of 0xED3E will be used. CONTROL Action to take following an encode/decode. index INDEX Assign a unique ID to this action instead of letting the kernel choose one automatically. INDEX is a 32bit unsigned integer greater than zero. EXAMPLES
On the receiving side, match packets with ethertype 0xdead and restart classification so that it will match ICMP on the next rule, at prio 3: # tc qdisc add dev eth0 handle ffff: ingress # tc filter add dev eth0 parent ffff: prio 2 protocol 0xdead u32 match u32 0 0 flowid 1:1 action ife decode reclassify # tc filter add dev eth0 parent ffff: prio 3 protocol ip u32 match ip protocol 0xff flowid 1:1 action continue Match with skb mark of 17: # tc filter add dev eth0 parent ffff: prio 4 protocol ip handle 0x11 fw flowid 1:1 action ok Configure the sending side to encode for the filters above. Use a destination IP address of 192.168.122.237/24, then tag with skb mark of decimal 17. Encode the packaet with ethertype 0xdead, add skb->mark to whitelist of metadatum to send, and rewrite the destination MAC address to 02:15:15:15:15:15. # tc qdisc add dev eth0 root handle 1: prio # tc filter add dev eth0 parent 1: protocol ip prio 10 u32 match ip dst 192.168.122.237/24 match ip protocol 1 0xff flowid 1:2 action skbedit mark 17 action ife encode type 0xDEAD allow mark dst 02:15:15:15:15:15 SEE ALSO
tc(8), tc-u32(8) iproute2 22 Apr 2016 IFE action in tc(8)

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Mirror/redirect action in tc(8) 				       Linux					   Mirror/redirect action in tc(8)

NAME
mirred - mirror/redirect action SYNOPSIS
tc ... action mirred DIRECTION ACTION [ index INDEX ] dev DEVICENAME DIRECTION := { ingress | egress } ACTION := { mirror | redirect } DESCRIPTION
The mirred action allows packet mirroring (copying) or redirecting (stealing) the packet it receives. Mirroring is what is sometimes referred to as Switch Port Analyzer (SPAN) and is commonly used to analyze and/or debug flows. OPTIONS
ingress egress Specify the direction in which the packet shall appear on the destination interface. mirror redirect Define whether the packet should be copied (mirror) or moved (redirect) to the destination interface. index INDEX Assign a unique ID to this action instead of letting the kernel choose one automatically. INDEX is a 32bit unsigned integer greater than zero. dev DEVICENAME Specify the network interface to redirect or mirror to. EXAMPLES
Limit ingress bandwidth on eth0 to 1mbit/s, redirect exceeding traffic to lo for debugging purposes: # tc qdisc add dev eth0 handle ffff: ingress # tc filter add dev eth0 parent ffff: u32 match u32 0 0 action police rate 1mbit burst 100k conform-exceed pipe action mirred egress redirect dev lo Mirror all incoming ICMP packets on eth0 to a dummy interface for examination with e.g. tcpdump: # ip link add dummy0 type dummy # ip link set dummy0 up # tc qdisc add dev eth0 handle ffff: ingress # tc filter add dev eth0 parent ffff: protocol ip u32 match ip protocol 1 0xff action mirred egress mirror dev dummy0 Using an ifb interface, it is possible to send ingress traffic through an instance of sfq: # modprobe ifb # ip link set ifb0 up # tc qdisc add dev ifb0 root sfq # tc qdisc add dev eth0 handle ffff: ingress # tc filter add dev eth0 parent ffff: u32 match u32 0 0 action mirred egress redirect dev ifb0 SEE ALSO
tc(8), tc-u32(8) iproute2 11 Jan 2015 Mirror/redirect action in tc(8)
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