#!/bin/sh
#
# Configure routing and miscellaneous network tunables
#
# $FreeBSD$
#

# PROVIDE: routing
# REQUIRE: netif ppp stf
# KEYWORD: nojailvnet

. /etc/rc.subr
. /etc/network.subr

name="routing"
desc="Routing setup"
start_cmd="routing_start doall"
stop_cmd="routing_stop"
extra_commands="options static"
static_cmd="routing_start static"
options_cmd="routing_start options"

ROUTE_CMD="/sbin/route"

routing_start()
{
	local _cmd _af _if _a _ret
	_cmd=$1
	_af=$2
	_if=$3
	_ret=0

	case $_if in
	""|[Aa][Ll][Ll]|[Aa][Nn][Yy])	_if="" ;;
	esac

	case $_af in
	""|[Aa][Ll][Ll]|[Aa][Nn][Yy])
		for _a in inet inet6; do
			afexists $_a || continue
			setroutes $_cmd $_a $_if || _ret=1
		done
	;;
	*)
		if afexists $_af; then
			setroutes $_cmd $_af $_if || _ret=1
		else
			err 1 "Unsupported address family: $_af."
		fi
	;;
	esac

	return $_ret
}

routing_stop()
{
	local _af _if _a
	_af=$1
	_if=$2

	case $_if in
	""|[Aa][Ll][Ll]|[Aa][Nn][Yy])	_if="" ;;
	esac

	case $_af in
	""|[Aa][Ll][Ll]|[Aa][Nn][Yy])
		for _a in inet inet6; do
			afexists $_a || continue
			eval static_${_a} delete $_if
			# When $_if is specified, do not flush routes.
			if ! [ -n "$_if" ]; then
				eval routing_stop_${_a}
			fi
		done
	;;
	*)
		if afexists $_af; then
			eval static_${_af} delete $_if 
			# When $_if is specified, do not flush routes.
			if ! [ -n "$_if" ]; then
				eval routing_stop_${_af}
			fi
		else
			err 1 "Unsupported address family: $_af."
		fi
	;;
	esac
}

setroutes()
{
	local _ret
	_ret=0
	case $1 in
	static)
		static_$2 add $3
		_ret=$?
		;;
	options)
		options_$2
		;;
	doall)
		static_$2 add $3
		_ret=$?
		options_$2
		;;
	esac
	return $_ret
}

routing_stop_inet()
{
	${ROUTE_CMD} -n flush -inet
}

routing_stop_inet6()
{
	local i

	${ROUTE_CMD} -n flush -inet6
	for i in `list_net_interfaces`; do
		if ipv6if $i; then
			ifconfig $i inet6 -defaultif
		fi
	done
}

get_fibmod()
{
	local _fibs

	_fibs=$((`${SYSCTL_N} net.fibs` - 1))
	if [ ${_fibs} -gt 0 ]; then
		echo "-fib 0-${_fibs}"
	else
		echo
	fi
}

static_inet()
{
	local _action _if _skip _fibmod _fibs
	_action=$1
	_if=$2

	_fibmod=`get_fibmod`
	_fibs=$((`${SYSCTL_N} net.fibs` - 1))

	# Provide loopback route in all routing tables.  This has to come
	# first so that any following routes can be added.
	static_routes="_loopback ${static_routes}"
	route__loopback="-inet 127.0.0.1 -iface lo0 ${_fibmod}"

	# Add default route.
	case ${defaultrouter} in
	[Nn][Oo] | '')
		;;
	*)
		static_routes="${static_routes} _default"
		route__default="default ${defaultrouter}"
		;;
	esac

	# Add default routes for fibs
	if [ ${_fibs} -gt 0 ]; then
		for _fibnum in `jot ${_fibs}` ; do
			eval _fib_gw=\${defaultrouter_fib${_fibnum}}
			case ${_fib_gw} in
			[Nn][Oo] | '')
				;;
			*)
				static_routes="${static_routes} _default_fib${_fibnum}"
				eval route__default_fib${_fibnum}="'default ${_fib_gw} -fib ${_fibnum}'"
				;;
			esac
		done
	fi


	# Install configured routes.
	if [ -n "${static_routes}" ]; then
		for i in ${static_routes}; do
			_skip=0
			if [ -n "$_if" ]; then
				case $i in
				*:$_if)	;;
				*)	_skip=1 ;;
				esac
			fi
			if [ $_skip = 0 ]; then
				route_args=`get_if_var ${i%:*} route_IF`
				if [ -n "$route_args" ]; then
					${ROUTE_CMD} ${_action} ${route_args}
				else
					warn "route_${i%:*} not found."
				fi
			fi
		done
	fi
}

static_inet6()
{
	local _action _if _skip fibmod _fibs
	_action=$1
	_if=$2

	fibmod=`get_fibmod`
	_fibs=$((`${SYSCTL_N} net.fibs` - 1))

	# Add pre-defined static routes first.
	ipv6_static_routes="_v4mapped _v4compat ${ipv6_static_routes}"
	ipv6_static_routes="_lla _llma ${ipv6_static_routes}"
	ipv6_static_routes="_loopback ${ipv6_static_routes}"

	# disallow "internal" addresses to appear on the wire
	ipv6_route__v4mapped="::ffff:0.0.0.0 -prefixlen 96 ::1 -reject ${fibmod}"
	ipv6_route__v4compat="::0.0.0.0 -prefixlen 96 ::1 -reject ${fibmod}"

	# Create a loopback route in every fib
	ipv6_route__loopback="::1 -prefixlen 128 -iface lo0 ${fibmod}"

	# Disallow link-local unicast packets without outgoing scope
	# identifiers.  However, if you set "ipv6_default_interface",
	# for the host case, you will allow to omit the identifiers.
	# Under this configuration, the packets will go to the default
	# interface.
	ipv6_route__lla="fe80:: -prefixlen 10 ::1 -reject ${fibmod}"
	ipv6_route__llma="ff02:: -prefixlen 16 ::1 -reject ${fibmod}"

	# Add default route.
	case ${ipv6_defaultrouter} in
	[Nn][Oo] | '')
		;;
	*)
		ipv6_static_routes="${ipv6_static_routes} _default"
		ipv6_route__default="default ${ipv6_defaultrouter}"
		;;
	esac

	# Add default routes for fibs
	if [ ${_fibs} -gt 0 ]; then
		for _fibnum in `jot ${_fibs}` ; do
			eval _fib_gw=\${ipv6_defaultrouter_fib${_fibnum}}
			case ${_fib_gw} in
			[Nn][Oo] | '')
				;;
			*)
				ipv6_static_routes="${ipv6_static_routes} _default_fib${_fibnum}"
				eval ipv6_route__default_fib${_fibnum}="'default ${_fib_gw} -fib ${_fibnum}'"
				;;
			esac
		done
	fi


	# Install configured routes.
	if [ -n "${ipv6_static_routes}" ]; then
		for i in ${ipv6_static_routes}; do
			_skip=0
			if [ -n "$_if" ]; then
				case $i in
				*:$_if)	;;
				*)	_skip=1 ;;
				esac
			fi
			if [ $_skip = 0 ]; then
				ipv6_route_args=`get_if_var ${i%:*} ipv6_route_IF`
				if [ -n "$ipv6_route_args" ]; then
					${ROUTE_CMD} ${_action} \
						-inet6 ${ipv6_route_args}
				else
					warn "route_${i%:*} not found"
				fi
			fi
		done
	fi

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

	# Disable installing the default interface when we act
	# as router to avoid conflict between the default
	# router list and the manual configured default route.
	if checkyesno ipv6_gateway_enable; then
		return
	fi

	case "${ipv6_default_interface}" in
	[Nn][Oo] | [Nn][Oo][Nn][Ee])
		return
		;;
	[Aa][Uu][Tt][Oo] | "")
		for i in ${ipv6_network_interfaces}; do
			case $i in
			[Nn][Oo][Nn][Ee])
				return
				;;
			lo0)
				continue
				;;
			esac
			laddr=`network6_getladdr $i exclude_tentative`
			case ${laddr} in
			'')
				;;
			*)
				ipv6_default_interface=$i
				break
				;;
			esac
		done
		;;
	esac

	ifconfig ${ipv6_default_interface} inet6 defaultif
	${SYSCTL} net.inet6.ip6.use_defaultzone=1 > /dev/null
}

ropts_init()
{
	if [ -z "${_ropts_initdone}" ]; then
		echo -n "Additional $1 routing options:"
		_ropts_initdone=yes
	fi
}

_check_dynamicrouting()
{
	local skip file name rcvar

	# copied from /etc/rc
	skip="-s nostart"
	if [ `/sbin/sysctl -n security.jail.jailed` -eq 1 ]; then
		skip="$skip -s nojail"
	fi
	[ -n "$local_startup" ] && find_local_scripts_new
	[ -n "$system_rc" ] && find_system_scripts
	
	for file in $( rcorder ${skip} ${system_rc} ${local_rc} 2>/dev/null |
		       xargs grep -lE '^# PROVIDE:.*\<dynamicrouting\>' ); do
		(set -- enabled; . $file) && return 0;
	done

	return 1
}

options_inet()
{
	local _icmp_drop_redirect

	_ropts_initdone=
	if checkyesno icmp_bmcastecho; then
		ropts_init inet
		echo -n ' broadcast ping responses=YES'
		${SYSCTL} net.inet.icmp.bmcastecho=1 > /dev/null
	else
		${SYSCTL} net.inet.icmp.bmcastecho=0 > /dev/null
	fi

	_icmp_drop_redirect="${icmp_drop_redirect}"
	case "${_icmp_drop_redirect}" in
	[Aa][Uu][Tt][Oo] | "")
		if _check_dynamicrouting; then
			_icmp_drop_redirect="yes"
		else
			_icmp_drop_redirect="no"
		fi
		;;
	esac
	if checkyesno _icmp_drop_redirect; then
		ropts_init inet
		echo -n ' ignore ICMP redirect=YES'
		${SYSCTL} net.inet.icmp.drop_redirect=1 > /dev/null
	else
		${SYSCTL} net.inet.icmp.drop_redirect=0 > /dev/null
	fi

	if checkyesno icmp_log_redirect; then
		ropts_init inet
		echo -n ' log ICMP redirect=YES'
		${SYSCTL} net.inet.icmp.log_redirect=1 > /dev/null
	else
		${SYSCTL} net.inet.icmp.log_redirect=0 > /dev/null
	fi

	if checkyesno gateway_enable; then
		ropts_init inet
		echo -n ' gateway=YES'
		${SYSCTL} net.inet.ip.forwarding=1 > /dev/null
	else
		${SYSCTL} net.inet.ip.forwarding=0 > /dev/null
	fi

	if checkyesno forward_sourceroute; then
		ropts_init inet
		echo -n ' do source routing=YES'
		${SYSCTL} net.inet.ip.sourceroute=1 > /dev/null
	else
		${SYSCTL} net.inet.ip.sourceroute=0 > /dev/null
	fi

	if checkyesno accept_sourceroute; then
		ropts_init inet
		echo -n ' accept source routing=YES'
		${SYSCTL} net.inet.ip.accept_sourceroute=1 > /dev/null
	else
		${SYSCTL} net.inet.ip.accept_sourceroute=0 > /dev/null
	fi

	if checkyesno arpproxy_all; then
		ropts_init inet
		echo -n ' ARP proxyall=YES'
		${SYSCTL} net.link.ether.inet.proxyall=1 > /dev/null
	else
		${SYSCTL} net.link.ether.inet.proxyall=0 > /dev/null
	fi

	[ -n "${_ropts_initdone}" ] && echo '.'
}

options_inet6()
{
	_ropts_initdone=

	if checkyesno ipv6_gateway_enable; then
		ropts_init inet6
		echo -n ' gateway=YES'
		${SYSCTL} net.inet6.ip6.forwarding=1 > /dev/null
	else
		${SYSCTL} net.inet6.ip6.forwarding=0 > /dev/null
	fi

	[ -n "${_ropts_initdone}" ] && echo '.'
}

load_rc_config $name
run_rc_command "$@"