#!/bin/sh
set -x

if [[ $1 = "up" ]]
then
	ip link add name virbr0 type bridge
	ip link set up dev virbr0
	ip addr add 10.0.0.1/8 dev virbr0
	ip route append default via 10.0.0.1 dev virbr0

	nft add table inet nat
	nft add chain inet nat postrouting '{ type nat hook postrouting priority 100 ; }'
	nft add rule inet nat postrouting oifname wlan0 masquerade
	nft add rule inet filter forward ct state related,established accept
	nft add rule inet filter forward iifname virbr0 oifname wlan0 accept
elif [[ $1 = "down" ]]
then
	nft delete rule inet filter forward iifname virbr0 oifname wlan0 accept
	nft delete rule inet filter forward ct state related,established accept
	nft delete table inet nat

	ip link del virbr0
else
	echo "Use the 'up' or 'down' command"
fi