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#!/bin/bash
set -x
set -e
get_default_iface() {
ip -4 r show default | awk '{print $5}'
}
declare -A UPSTREAMS=(
[mtsil]=102
[mtsazov]=100
[rtazov]=101
)
for name in "${!UPSTREAMS[@]}"; do
mark=${UPSTREAMS[$name]}
veth_addr=10.${mark}.1.1
vpeer_addr=10.${mark}.1.2
veth_if=veth${name}
vpeer_if=vpeer${name}
ip netns add $name
ip link add $veth_if type veth peer name $vpeer_if
ip link set $vpeer_if netns $name
ip addr add $veth_addr/24 dev $veth_if
ip link set $veth_if up
ip netns exec $name ip addr add $vpeer_addr/24 dev $vpeer_if
ip netns exec $name ip link set $vpeer_if up
ip netns exec $name ip link set lo up
ip netns exec $name ip route add default via $veth_addr
iptables -t mangle -A PREROUTING -s $vpeer_addr/24 -j MARK --set-mark $mark
iptables -t nat -A POSTROUTING -s $vpeer_addr/24 -o "$(get_default_iface)" -j MASQUERADE
done
sysctl net.ipv4.ip_forward=1
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