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#!/bin/bash
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# This is an example of a Ganeti kvm ifup script that configures network
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# interfaces based on the initial deployment of the Okeanos project
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TAP_CONSTANT_MAC=cc:47:52:4e:45:54 # GRNET in hex :-)
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MAC2EUI64=/usr/bin/mac2eui64
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NFDHCPD_STATE_DIR=/var/lib/nfdhcpd
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function routed_setup_ipv4 {
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	# get the link's default gateway
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	gw=$(ip route list table $LINK | sed -n 's/default via \([^ ]\+\).*/\1/p' | head -1)
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	# mangle ARPs to come from the gw's IP
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	arptables -D OUTPUT -o $INTERFACE --opcode request -j mangle >/dev/null 2>&1
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	arptables -A OUTPUT -o $INTERFACE --opcode request -j mangle --mangle-ip-s "$gw"
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	# route interface to the proper routing table
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	while ip rule del dev $INTERFACE; do :; done
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	ip rule add dev $INTERFACE table $LINK
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	# static route mapping IP -> INTERFACE
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	ip route replace $IP table $LINK proto static dev $INTERFACE
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	# Enable proxy ARP
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	echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp
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}
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function routed_setup_ipv6 {
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	# Add a routing entry for the eui-64
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	prefix=$(ip -6 route list table $LINK | awk '/\/64/ {print $1; exit}')
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	uplink=$(ip -6 route list table $LINK | sed -n 's/default via .* dev \([^ ]\+\).*/\1/p' | head -1)
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	eui64=$($MAC2EUI64 $MAC $prefix)
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	while ip -6 rule del dev $INTERFACE; do :; done
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	ip -6 rule add dev $INTERFACE table $LINK
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	ip -6 ro replace $eui64/128 dev $INTERFACE table $LINK
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	ip -6 neigh add proxy $eui64 dev $uplink
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	# disable proxy NDP since we're handling this on userspace
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	# this should be the default, but better safe than sorry
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	echo 0 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp
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}
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# pick a firewall profile per NIC, based on tags (and apply it)
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function routed_setup_firewall {
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	ifprefix="synnefo:network:$INTERFACE_INDEX:"
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	for tag in $TAGS; do
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		case ${tag#$ifprefix} in
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		protected)
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			chain=protected
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		;;
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		unprotected)
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			chain=unprotected
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		;;
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		limited)
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			chain=limited
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		;;
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		esac
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	done
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	# Flush any old rules. We have to consider all chains, since
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	# we are not sure the instance was on the same chain, or had the same
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	# tap interface.
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	for oldchain in protected unprotected limited; do
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		iptables  -D FORWARD -o $INTERFACE -j $oldchain 2>/dev/null
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		ip6tables -D FORWARD -o $INTERFACE -j $oldchain 2>/dev/null
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	done
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	if [ "x$chain" != "x" ]; then
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		iptables  -A FORWARD -o $INTERFACE -j $chain
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		ip6tables -A FORWARD -o $INTERFACE -j $chain
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	fi
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}
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function routed_setup_nfdhcpd {
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	umask 022
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	cat >$NFDHCPD_STATE_DIR/$INTERFACE <<EOF
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IP=$IP
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MAC=$MAC
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LINK=$LINK
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HOSTNAME=$INSTANCE
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TAGS="$TAGS"
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EOF
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}
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if [ "$MODE" = "routed" ]; then
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	# special proxy-ARP/NDP routing mode
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	# use a constant predefined MAC address for the tap
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	ip link set $INTERFACE addr $TAP_CONSTANT_MAC
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	# bring the tap up
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	ifconfig $INTERFACE 0.0.0.0 up
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	# Drop unicast BOOTP/DHCP packets
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	iptables -D FORWARD -i $INTERFACE -p udp --dport 67 -j DROP 2>/dev/null
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	iptables -A FORWARD -i $INTERFACE -p udp --dport 67 -j DROP
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	routed_setup_ipv4
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	routed_setup_ipv6
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	routed_setup_firewall
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	routed_setup_nfdhcpd
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elif [ "$MODE" = "bridged" ]; then
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	ifconfig $INTERFACE 0.0.0.0 up
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	brctl addif $BRIDGE $INTERFACE
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	rm -f $NFDHCPD_STATE_DIR/$INTERFACE
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fi