## Take the various IP versions in turn.
unref=nil
for ip in ip ip6; do
+ if [ "$FW_NOACT" ]; then break; fi
+
for table in $(cat /proc/net/${ip}_tables_names); do
## Step 1: clear out the builtin chains.
## Set forwarding options. Apparently setting ip_forward clobbers other
## settings, so put this first.
case $host_type_<::>FWHOST in
- router) forward=1 ;;
- *) forward=0 ;;
+ router) forward=1 host=0 ;;
+ server) forward=0 host=0 ;;
+ client) forward=0 host=1 ;;
esac
setopt ip_forward $forward
setdevopt forwarding $forward
+for i in \
+ accept_ra accept_ra_defrtr accept_ra_pinfo accept_ra_info_max_plen \
+ accept_redirects
+do
+ setdevopt $i $host
+done
case $forward in
0) inchains="INPUT" ;;
1) inchains="INPUT FORWARD" ;;
## Turn off iptables filtering for bridges. We'll use ebtables if we need
## to; but right now the model is that we do filtering at the borders, and
## are tolerant of things which are local.
-if [ -x /sbin/brctl ]; then
+if [ -x /sbin/brctl ] || [ -x /usr/sbin/brctl ]; then
modprobe bridge || :
- if [ -d /proc/sys/net/bridge ]; then
- for filter in arptables iptables ip6tables; do
- run sysctl -q net.bridge.bridge-nf-call-$filter=0
- done
- fi
+fi
+if [ -d /proc/sys/net/bridge ]; then
+ for filter in arptables iptables ip6tables; do
+ run sysctl -q net.bridge.bridge-nf-call-$filter=0
+ done
fi
## Turn off the reverse-path filter. It's basically useless: the filter does
## Turn off things which can mess with our routing decisions.
setdevopt accept_source_route 0
-setdevopt accept_redirects 0
+setdevopt secure_redirects 1
## If we're maent to stop the firewall, then now is the time to do it.
$exit_after_clearing
## Packet arrived on wrong interface for its source address. Drops the
## packet, since there's nowhere sensible to send an error.
+errorchain dns-rate-limit DROP
+## Dropped incoming DNS query due to rate limiting. The source address is
+## suspicious, so don't produce ICMP.
+
errorchain bad-destination-address REJECT
## Packet arrived on non-loopback interface with loopback destination.
-m addrtype --dst-type BROADCAST
run iptables -A FORWARD -g bad-destination-address \
-d 224.0.0.0/24
+ clearchain check-fwd-multi
for x in 0 1 2 3 4 5 6 7 8 9 a b c d e f; do
- run ip6tables -A FORWARD -g bad-destination-address \
- -d fe${x}2::/16
+ run ip6tables -A check-fwd-multi -g bad-destination-address \
+ -d ff${x}2::/16
done
+ run ip6tables -A FORWARD -j check-fwd-multi -d ff00::/8
;;
esac