#! /bin/sh
# $FreeBSD$

# Note that almost all of the user-configurable behavior is not in this
# file, but rather in /etc/defaults/rc.conf.  Please check that file
# first before contemplating any changes here.  If you do need to change
# this file for some reason, we would like to know about it.

# IPv6 startup

network6_pass1() {
	echo -n 'Doing IPv6 network setup:'

	case ${ipv6_gateway_enable} in
	[Yy][Ee][Ss])
		#
		# list of interfaces, and prefix for interfaces
		#
		case ${ipv6_network_interfaces} in
		[Aa][Uu][Tt][Oo])
			ipv6_network_interfaces="`ifconfig -l`"
			;;
		esac
		;;
	*)
		#
		# manual configurations - in case ip6_gateway_enable=NO
		# you can configure only single interface,
		# as specification assumes that
		# autoconfigured host has single interface only.
		#
		case ${ipv6_network_interfaces} in
		[Aa][Uu][Tt][Oo])
			set `ifconfig -l`
			ipv6_network_interfaces="$1"
			;;
		esac
		;;
	esac

	# just to make sure
	ifconfig lo0 up

	# disallow "internal" addresses to appear on the wire
	route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
	route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject

	case ${ipv6_gateway_enable} in
	[Yy][Ee][Ss])
		# act as a router
		sysctl -w net.inet6.ip6.forwarding=1
		sysctl -w net.inet6.ip6.accept_rtadv=0

		# wait for DAD
		for i in $ipv6_network_interfaces; do
			ifconfig $i up
		done
		sleep `sysctl -n net.inet6.ip6.dad_count`
		sleep 1

		# setting up interfaces
		for i in $ipv6_network_interfaces; do
			eval prefix=\$ipv6_prefix_$i
			case ${prefix} in
			'')
				continue;
				;;
			esac
			for j in ${prefix}; do
				case ${prefixcmd_enable} in
				[Yy][Ee][Ss])
					prefix $i $j::
					;;
				*)
					laddr=`network6_getladdr $i`
					hostid=`expr "${laddr}" : \
						     'fe80::\(.*\)%\(.*\)'`
					address=$j\:${hostid}

					eval hostid_$i=${hostid}
					eval address_$i=${address}

					ifconfig $i inet6 ${address} \
						prefixlen 64 alias
					;;
				esac

				# subnet-router anycast address (rfc2373)
				ifconfig $i inet6 $j:: prefixlen 64 \
					alias anycast
			done

			ifconfig $i inet6
		done

		# again, wait for DAD's completion (for global addrs)
		sleep `sysctl -n net.inet6.ip6.dad_count`
		sleep 1

		# Filter out interfaces on which IPv6 addr init failed.
		ipv6_working_interfaces=""
		for i in ${ipv6_network_interfaces}; do
			laddr=`network6_getladdr $i exclude_tentative`
			case ${laddr} in
			'')
				;;
			*)
				ipv6_working_interfaces="$i \
					${ipv6_working_interfaces}"
				;;
			esac
		done
		ipv6_network_interfaces=${ipv6_working_interfaces}

		# gifconfig
		network6_gif_setup

		# 6to4 setup
		network6_stf_setup

		# install the "default interface" to kernel, which will be used
		# as the default route when there's no router.
		network6_default_interface_setup

		# setup static routes
		network6_static_routes_setup

		# ipv6_router
		case ${ipv6_router_enable} in
		[Yy][Ee][Ss])
			if [ -x ${ipv6_router} ]; then
				echo -n " ${ipv6_router}"
				${ipv6_router} ${ipv6_router_flags}
			fi
			;;
		esac

		# rtadvd
		# This should enabled with a great care.
		# You may want to fine-tune /etc/rtadvd.conf.
		#
		# And if you wish your rtadvd to receive and process
		# router renumbering messages, specify your Router Renumbering
		# security policy by -P option.
		#
		# See `man 3 ipsec_set_policy` for IPsec policy specification
		# details.
		# (CAUTION: This enables your routers prefix renumbering
		# from another machine, so if you enable this, do it with
		# enough care.)
		#
		case ${rtadvd_enable} in
		[Yy][Ee][Ss])
			# default
			for i in ${ipv6_network_interfaces}; do
				case $i in
				stf*)
					continue
					;;
				*)
					rtadvd_interfaces="${rtadvd_interfaces} ${i}"
					;;
				esac
			done
			rtadvd ${rtadvd_interfaces}
			#
			# Enable Router Renumbering, unicast case
			# (use correct src/dst addr)
			# rtadvd -P "in ipsec ah/transport/fec0:0:0:1::1-fec0:0:0:10::1/require" \
			#	${ipv6_network_interfaces}
			# Enable Router Renumbering, multicast case
			# (use correct src addr)
			# rtadvd -P "in ipsec ah/transport/ff05::2-fec0:0:0:10::1/require" \
			#	${ipv6_network_interfaces}
			;;
		esac

		# mroute6d
		case ${mroute6d_enable} in
		[Yy][Ee][Ss])
			if [ -x ${mroute6d_program} ]; then
				echo -n " ${mroute6d_program}"
				${mroute6d_program} ${mroute6d_flags}
			fi
			;;
		esac
		;;
	*)
		# act as endhost - automatically configured
		sysctl -w net.inet6.ip6.forwarding=0
		sysctl -w net.inet6.ip6.accept_rtadv=1

		case ${ipv6_network_interfaces} in
		lo0|gif*|stf*|faith*)
			;;
		*)
			ifconfig ${ipv6_network_interfaces} up
			rtsol ${ipv6_network_interfaces}
			;;
		esac

		# wait for DAD's completion (for global addrs)
		sleep `sysctl -n net.inet6.ip6.dad_count`
		sleep 1

		# gifconfig
		network6_gif_setup

		# 6to4 setup
		network6_stf_setup

		# install the "default interface" to kernel, which will be used
		# as the default route when there's no router.
		# ndp -I ${ipv6_default_interface}
		network6_default_interface_setup

		# setup static routes
		network6_static_routes_setup
		;;
	esac

	case ${ipv6_ipv4mapping} in
	[Yy][Ee][Ss])
		echo -n ' IPv4 mapped IPv6 address support=YES'
		sysctl -w net.inet6.ip6.mapped_addr=1 >/dev/null
		;;
	'' | *)
		echo -n ' IPv4 mapped IPv6 address support=NO'
		sysctl -w net.inet6.ip6.mapped_addr=0 >/dev/null
		;;
	esac

	echo '.'

	# Let future generations know we made it.
	#
	network6_pass1_done=YES
}

network6_gif_setup() {
	case ${gif_interfaces} in
	[Nn][Oo] | '')
		;;
	*)
		for i in ${gif_interfaces}; do
			eval peers=\$gifconfig_$i
			case ${peers} in
			'')
				continue
				;;
			*)
				gifconfig $i ${peers}
				;;
			esac
		done
		;;
	esac
}

network6_stf_setup() {
	case ${stf_interface_ipv4addr} in
	[Nn][Oo] | '')
		;;
	*)
		# assign IPv6 addr and interface route for 6to4 interface
		stf_prefixlen=$((16+${stf_interface_ipv4plen:-0}))
		OIFS="$IFS"
		IFS=".$IFS"
		set ${stf_interface_ipv4addr}
		IFS="$OIFS"
		ipv4_in_hexformat=`printf "%x:%x\n" \
			$(($1*256 + $2)) $(($3*256 + $4))`
		case ${stf_interface_ipv6_ifid} in
		[Aa][Uu][Tt][Oo] | '')
			for i in ${ipv6_network_interfaces}; do
				laddr=`network6_getladdr ${i}`
				case ${laddr} in
				'')
					;;
				*)
					break
					;;
				esac
			done
			stf_interface_ipv6_ifid=`expr "${laddr}" : \
						      'fe80::\(.*\)%\(.*\)'`
			case ${stf_interface_ipv6_ifid} in
			'')
				stf_interface_ipv6_ifid=0:0:0:1
				;;
			esac
			;;
		esac
		ifconfig stf0 inet6 2002:${ipv4_in_hexformat}:${stf_interface_ipv6_slaid:-0}:${stf_interface_ipv6_ifid} \
			prefixlen ${stf_prefixlen}
		# disallow packets to malicious 6to4 prefix
		route add -inet6 2002:e000:: -prefixlen 20 ::1 -reject
		route add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
		route add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
		route add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject
		;;
	esac
}

network6_static_routes_setup() {
	# Set up any static routes.
	case ${ipv6_static_routes} in
	[Nn][Oo] | '')
		;;
	*)
		for i in ${ipv6_static_routes}; do
			eval ipv6_route_args=\$ipv6_route_${i}
			route add -inet6 ${ipv6_route_args}
		done
		;;
	esac
}

network6_default_interface_setup() {
	# Choose IPv6 default interface if it is not clearly specified.
	case ${ipv6_default_interface} in
	'')
		for i in ${ipv6_network_interfaces}; do
			laddr=`network6_getladdr $i exclude_tentative`
			case ${laddr} in
			'')
				;;
			*)
				ipv6_default_interface=$i
				break
				;;
			esac
		done
		;;
	esac

	# Disallow unicast packets without outgoing scope identifiers,
	# or route such packets to a "default" interface, if it is specified.
	case ${ipv6_default_interface} in
	[Nn][Oo] | '')
		route add -inet6 fe80:: -prefixlen 10 ::1 -reject
		route add -inet6 fec0:: -prefixlen 10 ::1 -reject
		;;
	*)
		laddr=`network6_getladdr ${ipv6_default_interface}`
		route add -inet6 fec0:: ${laddr} -prefixlen 10 -interface \
			-cloning
		ndp -I ${ipv6_default_interface}
		;;
	esac
}

network6_getladdr() {
	ifconfig $1 2>/dev/null | while read proto addr rest; do
		case ${proto} in
		inet6)
			case ${addr} in
			fe80::*)
				if [ -z "$2" ]; then
					echo ${addr}
					return
				fi
				case ${rest} in
				*tentative*)
					continue
					;;
				*)
					echo ${addr}
					return
				esac
			esac
		esac
	done
}