#!/bin/sh

# vrf0 sends out packets with mpls labels
# vrf1 receives the labelled packets, pops the labels, and forwards to vrf2
# vrf2 receives the unlabelled packets and replies to vrf0

vrf add vrf0 table 1001
vrf add vrf1 table 1002
vrf add vrf2 table 1003

ip link add virt01 type veth peer name virt10
ip link set virt01 master vrf0
ip link set virt10 master vrf1

ip link add virt12 type veth peer name virt21
ip link set virt12 master vrf1
ip link set virt21 master vrf2

ip addr add 172.16.20.20/24 dev virt01
ip link set virt01 up

ip addr add 172.16.20.21/24 dev virt10
ip link set virt10 up
ip addr add 172.16.21.21/24 dev virt12
ip link set virt12 up

ip addr add 172.16.21.22/24 dev virt21
ip link set virt21 up

modprobe mpls_iptunnel

ip route add vrf vrf0 10.10.10.10/32 encap mpls 100 via inet 172.16.20.21 
ip route add vrf vrf0 172.16.21.0/24 via 172.16.20.21 

sysctl -w net.mpls.conf.virt10.input=1
sysctl -w net.mpls.platform_labels=1000
ip -f mpls route add 100 via inet 172.16.21.22 dev virt12

ip addr add 10.10.10.10/32 dev vrf2
ip route add vrf vrf2 172.16.20.0/24 via 172.16.21.21

ping -c 1 -I vrf0 10.10.10.10

netserver

cat <<EOF
# non-mpls
netperf -J vrf0 -c -C -H 172.16.21.22 -l 10 -t TCP_STREAM

# mpls (retry this with mpls_gso loaded)
netperf -J vrf0 -c -C -H 10.10.10.10 -l 10 -t TCP_STREAM
EOF