HardenedBSD/etc/rc.d/netoptions

#!/bin/sh
#
# $FreeBSD$
#

# PROVIDE: netoptions
# REQUIRE: FILESYSTEMS
# BEFORE: netif
# KEYWORD: nojail

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

name="netoptions"
start_cmd="netoptions_start"
stop_cmd=:

_netoptions_initdone=
netoptions_init()
{
	if [ -z "${_netoptions_initdone}" ]; then
		echo -n 'Additional TCP/IP options:'
		_netoptions_initdone=yes
	fi
}

netoptions_start()
{
	local _af

	for _af in inet inet6; do
		afexists ${_af} && eval netoptions_${_af}
	done
	[ -n "${_netoptions_initdone}" ] && echo '.'
}

netoptions_inet()
{
	case ${log_in_vain} in
	[12])
		netoptions_init
		echo -n " log_in_vain=${log_in_vain}"
		${SYSCTL_W} net.inet.tcp.log_in_vain=${log_in_vain} >/dev/null
		${SYSCTL_W} net.inet.udp.log_in_vain=${log_in_vain} >/dev/null
		;;
	*)
		${SYSCTL_W} net.inet.tcp.log_in_vain=0 >/dev/null
		${SYSCTL_W} net.inet.udp.log_in_vain=0 >/dev/null
		;;
	esac

	if checkyesno tcp_extensions; then
		${SYSCTL_W} net.inet.tcp.rfc1323=1 >/dev/null
	else
		netoptions_init
		echo -n " rfc1323 extensions=${tcp_extensions}"
		${SYSCTL_W} net.inet.tcp.rfc1323=0 >/dev/null
	fi

	if checkyesno tcp_keepalive; then
		${SYSCTL_W} net.inet.tcp.always_keepalive=1 >/dev/null
	else
		netoptions_init
		echo -n " TCP keepalive=${tcp_keepalive}"
		${SYSCTL_W} net.inet.tcp.always_keepalive=0 >/dev/null
	fi

	if checkyesno tcp_drop_synfin; then
		netoptions_init
		echo -n " drop SYN+FIN packets=${tcp_drop_synfin}"
		${SYSCTL_W} net.inet.tcp.drop_synfin=1 >/dev/null
	else
		${SYSCTL_W} net.inet.tcp.drop_synfin=0 >/dev/null
	fi

	case ${ip_portrange_first} in
	[0-9]*)
		netoptions_init
		echo -n " ip_portrange_first=$ip_portrange_first"
		${SYSCTL_W} net.inet.ip.portrange.first=$ip_portrange_first >/dev/null
		;;
	esac

	case ${ip_portrange_last} in
	[0-9]*)
		netoptions_init
		echo -n " ip_portrange_last=$ip_portrange_last"
		${SYSCTL_W} net.inet.ip.portrange.last=$ip_portrange_last >/dev/null
		;;
	esac
}

netoptions_inet6()
{
	if checkyesno ipv6_ipv4mapping; then
		netoptions_init
		echo -n " ipv4-mapped-ipv6=${ipv6_ipv4mapping}"
		${SYSCTL_W} net.inet6.ip6.v6only=0 >/dev/null
	else
		${SYSCTL_W} net.inet6.ip6.v6only=1 >/dev/null
	fi
}

load_rc_config $name
run_rc_command $1