#! /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])
			ipv6_network_interfaces="`ifconfig -l \
				| sed -e 's/ .*//'`"
			;;
		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=`ifconfig $i inet6 \
						| grep 'inet6 fe80:' \
						| head -1 | awk '{print $2}'`
					hostid=`echo ${laddr} | sed \
					    -e 's/fe80:[0-9a-fA-F]+::/fe80::/' \
					    -e 's/fe80:://' -e 's/@.*//'`
					address=$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

		# gifconfig
		network6_gif_setup

		# install the "default interface" to kernel, which will be used
		# as the default route when there's no router.
		network6_default_interface_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
			rtadvd ${ipv6_network_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

		ifconfig ${ipv6_network_interfaces} up
		rtsol ${ipv6_network_interfaces}



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

		# gifconfig
		network6_gif_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
		;;
	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_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=`ifconfig $i inet6 | grep 'inet6 fe80:' | \
				head -1 | grep -v 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
	'')
		route add -inet6 fe80:: -prefixlen 10 ::1 -reject
		route add -inet6 ff02:: -prefixlen 16 ::1 -reject
		;;
	*)
		laddr=`ifconfig ${ipv6_default_interface} inet6 \
			| grep 'inet6 fe80:' | head -1 | awk '{print $2}'`
		route add -inet6 fe80:: ${laddr} -prefixlen 10 -interface \
			-cloning
		route add -inet6 ff02:: ${laddr} -prefixlen 16 -interface \
			-cloning
		;;
	esac
}