#!/bin/bash

# Bring the interface up (but without an IP)

if [ "$MODE" == "routed" ]; then
	ip link set $INTERFACE addr cc:47:52:4e:45:54
	ifconfig $INTERFACE 0.0.0.0 up
	# Add routing table entries
	while ip rule del dev $INTERFACE; do :; done
	ip rule add dev $INTERFACE table $LINK
	ip route replace $IP table $LINK proto static dev $INTERFACE

	# Enable proxy ARP/NDP
	echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp
	echo 0 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp

	# Add a routing entry for the eui-64
	prefix=$(ip -6 route list table $LINK | grep -m 1 "/64" | awk '{ print $1 }')
	uplink=$(ip -6 route list table $LINK | grep -m 1 default | sed 's/.* dev \([^ ]\+\).*/\1/')
	eui64=$(mac2eui64 $MAC $prefix)

	while ip -6 rule del dev $INTERFACE; do :; done
	ip -6 rule add dev $INTERFACE table $LINK
	ip -6 ro replace $eui64/128 dev $INTERFACE table $LINK
	ip -6 neigh add proxy $eui64 dev $uplink
	
	# Drop unicast BOOTP/DHCP packets
	iptables -D FORWARD -i $INTERFACE -p udp --dport 67 -j DROP 2>/dev/null
	iptables -A FORWARD -i $INTERFACE -p udp --dport 67 -j DROP

	# Generate the client configuration
	cat >/var/lib/nfdhcpd/$INTERFACE <<EOF
IP=$IP
MAC=$MAC
LINK=$LINK
HOSTNAME=$INSTANCE
TAGS=$TAGS
EOF
else
	ifconfig $INTERFACE 0.0.0.0 up
	# Add the interface to the bridge
	brctl addif $BRIDGE $INTERFACE
	if [ -f "/var/run/nfdhcpd/$INTERFACE" ]; then
		rm /var/run/nfdhcpd/$INTERFACE
	fi
fi