xref: /src/etc/rc.d/network

#!/bin/sh
#
# $NetBSD: network,v 1.14 2000/07/17 15:25:42 lukem Exp $
#

# PROVIDE: network
# REQUIRE: root mountcritlocal tty sysctl

. /etc/rc.subr

name="network"
start_cmd="network_start"
stop_cmd="network_stop"

network_start()
{
	# set hostname, turn on network
	#
	echo "Starting network."

	# If $hostname is set, use it for my Internet name,
	# otherwise use /etc/myname
	#
	if [ -z "$hostname" -a -f /etc/myname ]; then
		hostname=`cat /etc/myname`
	fi
	if [ -n "$hostname" ]; then
		echo "Hostname: $hostname"
		hostname $hostname
	else
		# Don't warn about it if we're going to run
		# DHCP later, as we will probably get the
		# hostname at that time.
		#
		if ! checkyesno dhclient && [ -z "`hostname`" ]; then
			warn "\$hostname not set."
		fi
	fi

	# Check $domainname first, then /etc/defaultdomain,
	# for NIS/YP domain name
	#
	if [ -z "$domainname" -a -f /etc/defaultdomain ]; then
		domainname=`cat /etc/defaultdomain`
	fi
	if [ -n "$domainname" ]; then
		echo "NIS domainname: $domainname"
		domainname $domainname
	fi

	# Flush all routes just to make sure it is clean
	if checkyesno flushroutes; then
		route -n flush
	fi

	# Set the address for the first loopback interface, so that the
	# auto-route from a newly configured interface's address to lo0
	# works correctly.
	#
	# NOTE: obscure networking problems may occur if lo0 isn't configured...
	#
	ifconfig lo0 inet 127.0.0.1

	# According to RFC1122, 127.0.0.0/8 should not leave the node.
	#
	route add -inet 127.0.0.0 -netmask 0xff000000 127.0.0.1 -reject

	# Configure all of the network interfaces listed in $net_interfaces;
	# if $auto_ifconfig is YES, grab all interfaces from ifconfig.
	# In the following, "xxN" stands in for interface names, like "le0".
	# For any interfaces that has an $ifconfig_xxN variable associated,
	# we do "ifconfig xxN $ifconfig_xxN".
	# If there is no such variable, we take the contents of the file
	# /etc/ifconfig.xxN, and run "ifconfig xxN" repeatedly, using each
	# line of the file as the arguments for a seperate "ifconfig"
	# invocation.
	#
	# In order to configure an interface reasonably, you at the very least
	# need to specify "[addr_family] [hostname]" (e.g "inet my.domain.org"),
	# and probably a netmask (as in "netmask 0xffffffe0"). You will
	# frequently need to specify a media type, as in "media UTP", for
	# interface cards with multiple media connections that do not
	# autoconfigure. See the ifconfig manual page for details.
	#
	# Note that /etc/ifconfig.xxN takes multiple lines.  The following
	# configuration is possible:
	#	inet 10.1.1.1 netmask 0xffffff00
	#	inet 10.1.1.2 netmask 0xffffff00 alias
	#	inet6 fec0::1 prefixlen 64 alias
	#
	if [ "$net_interfaces" != NO ]; then
		if checkyesno auto_ifconfig; then
			tmp="`ifconfig -l`"
		else
			tmp="$net_interfaces"
		fi
		echo -n 'Configuring network interfaces:'
		for int in $tmp; do
			eval `echo 'args=$ifconfig_'$int`
			if [ -n "$args" ]; then
				echo -n " $int"
				ifconfig $int $args
			elif [ -f /etc/ifconfig.$int ]; then
				echo -n " $int"
				(while read args; do
					if [ -n "`eval echo '$args'`" ] ; then
						ifconfig $int $args
					fi
				done) < /etc/ifconfig.$int
			else
				if ! checkyesno auto_ifconfig; then
					echo
					warn \
			"/etc/ifconfig.$int missing and ifconfig_$int not set;"
					warn "interface $int not configured."
				fi
				continue
			fi
			configured_interfaces="$configured_interfaces $int"
		done
		echo "."
	fi

	# Check $defaultroute, then /etc/mygate, for the name of my gateway
	# host. That name must be in /etc/hosts.
	#
	if [ -z "$defaultroute" -a -f /etc/mygate ]; then
		defaultroute=`cat /etc/mygate`
	fi
	if [ -n "$defaultroute" ]; then
		route add default $defaultroute
	fi

	# Check if each configured interface xxN has an $ifaliases_xxN variable
	# associated, then configure additional IP addresses for that interface.
	# The variable contains a list of "address netmask" pairs, with
	# "netmask" set to "-" if the interface default netmask is to be used.
	#
	# Note that $ifaliases_xxN works only with certain configurations and
	# considered not recommended.  Use /etc/ifconfig.xxN if possible.
	# 
	#
	if [ -n "$configured_interfaces" ]; then
		echo "Adding interface aliases:"
		done_aliases_message=yes
	fi
	for int in $configured_interfaces; do
		eval `echo 'args=$ifaliases_'$int`
		if [ -n "$args" ]; then
			set -- $args
			while [ $# -ge 2 ]; do
				addr=$1 ; net=$2 ; shift 2
				if [ "$net" = "-" ]; then
					ifconfig $int inet alias $addr
				else
					ifconfig $int inet alias $addr \
					    netmask $net
				fi
				# Use loopback, not the wire
				route add $addr 127.0.0.1
			done
		fi
	done

	# /etc/ifaliases, if it exists, contains the names of additional IP
	# addresses for each interface. It is formatted as a series of lines
	# that contain
	#	address interface netmask
	#
	# Note that /etc/ifaliases works only with certain cases only and its
	# use is not recommended.  Use /etc/ifconfig.xxN instead.
	#
	#
	if [ -f /etc/ifaliases ]; then
	(
		if [ "$done_aliases_message" != yes ]; then
			echo "Adding interface aliases:"
		fi
		while read addr int net; do
			if [ -z "$net" ]; then
				ifconfig $int inet alias $addr
			else
				ifconfig $int inet alias $addr netmask $net
			fi
			# use loopback, not the wire
			route add $addr 127.0.0.1
		done
	) < /etc/ifaliases
	fi

	# IPv6
	# Note that manual configuration can be done in the above, using
	# ifconfig.
	#
	if ifconfig lo0 inet6 >/dev/null 2>&1; then
		# We have IPv6 support in kernel.

		# disallow link-local unicast dest without outgoing scope
		# identifiers.
		#
		route add -inet6 fe80:: -prefixlen 10 ::1 -reject

		# disallow site-local unicast dest without outgoing scope
		# identifiers.
		# If you configure site-locals without scope id (it is
		# permissible config for routers that are not on scope
		# boundary), you may want to comment the following one out.
		#
		route add -inet6 fec0:: -prefixlen 10 ::1 -reject

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

		# disallow packets to malicious IPv4 compatible prefix
		#
		route add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject
		route add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject
		route add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject
		route add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject

		# 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

		# Completely disallow packets to IPv4 compatible prefix.
		# This may conflict with RFC1933 under following circumstances:
		# (1) An IPv6-only KAME node tries to originate packets to IPv4
		#     comatible destination.  The KAME node has no IPv4
		#     compatible support.  Under RFC1933, it should transmit
		#     native IPv6 packets toward IPv4 compatible destination,
		#     hoping it would reach a router that forwards the packet
		#     toward auto-tunnel interface.
		# (2) An IPv6-only node originates a packet to IPv4 compatible
		#     destination.  A KAME node is acting as an IPv6 router, and
		#     asked to forward it.
		# Due to rare use of IPv4 compatible address, and security
		# issues with it, we disable it by default.
		#
		route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject

		sysctl -w net.inet6.ip6.forwarding=0 >/dev/null
		sysctl -w net.inet6.ip6.accept_rtadv=0 >/dev/null

		# backward compatibility
		#
		if [ -z "$ip6mode" -a -n "$ip6forwarding" ]; then
			warn 'Please migrate to newer rc.conf' \
			    '(use ip6mode, not ip6forwarding)'
			if checkyesno ip6forwarding; then
				ip6mode=router
			else
				if checkyesno rtsol; then
					ip6mode=autohost
				else
					ip6mode=host
				fi
			fi
		fi

		case $ip6mode in
		router)
			echo 'IPv6 mode: router'
			sysctl -w net.inet6.ip6.forwarding=1 >/dev/null
			;;

		autohost)
			echo 'IPv6 mode: autoconfigured host'
			sysctl -w net.inet6.ip6.accept_rtadv=1 >/dev/null
			;;

		host)	
			echo 'IPv6 mode: host'
			;;

		*)	echo 'WARNING: invalid value in ip6mode'
			;;

		esac

		if checkyesno rtsol; then
			if [ "$ip6mode" = "autohost" ]; then
				echo 'Sending router solicitation...'
				rtsol $rtsol_flags
			else
				echo
				warn \
			    "ip6mode must be set to 'autohost' to use rtsol."
			fi
		fi

		# wait till DAD is completed. always invoke it in case if are
		# configured manually by ifconfig
		#
		dadcount=`sysctl -n net.inet6.ip6.dad_count 2>/dev/null`
		sleep $dadcount
		sleep 1
	fi

	# XXX this must die
	if [ -s /etc/netstart.local ]; then
		sh /etc/netstart.local start
	fi
}

network_stop()
{
	echo "Stopping network."

	# XXX this must die
	if [ -s /etc/netstart.local ]; then
		sh /etc/netstart.local stop
	fi

	echo "Deleting aliases."
	if [ -f /etc/ifaliases ]; then
	(
		while read addr int net; do
			ifconfig $int inet delete $addr
		done
	) < /etc/ifaliases
	fi

	for int in $configured_interfaces; do
		eval `echo 'args=$ifaliases_'$int`
		if [ -n "$args" ]; then
			set -- $args
			while [ $# -ge 2 ]; do
				addr=$1 ; net=$2 ; shift 2
				ifconfig $int inet delete $addr
			done
		fi
	done

	# down interfaces
	#
	echo -n 'Downing network interfaces:'
	if [ "$net_interfaces" != NO ]; then
		if checkyesno auto_ifconfig; then
			tmp="`ifconfig -l`"
		else
			tmp="$net_interfaces"
		fi
		for int in $tmp; do
			eval `echo 'args=$ifconfig_'$int`
			if [ -n "$args" ] || [ -f /etc/ifconfig.$int ]; then
				echo -n " $int"
				ifconfig $int down
			fi
		done
		echo "."
	fi

	# flush routes
	#
	route -n flush

}

load_rc_config $name
run_rc_command "$1"