IPv6 firewall support.

[firewall] / classify.m4

diff --git a/classify.m4 b/classify.m4
index 148a72f..27eb376 100644 (file)
--- a/classify.m4
+++ b/classify.m4
@@ -67,7 +67,7 @@ clearchain mangle:local-source
 
 ## Packets over the loopback interface are automatically trusted.  All manner
 ## of weird stuff happens on lo, and it's best not to second-guess it.
-run iptables -t mangle -A in-classify -i lo -j ACCEPT
+run ip46tables -t mangle -A in-classify -i lo -j ACCEPT
 
 ## Local bootp packets have bizarre addresses.  Don't block them just because
 ## of this.
@@ -83,9 +83,15 @@ run iptables -t mangle -A local-source -j RETURN \
        -m addrtype --dst-type BROADCAST
 run iptables -t mangle -A local-source -j RETURN \
        -m addrtype --dst-type MULTICAST
-run iptables -t mangle -A local-source -g bad-source-address
+run ip6tables -t mangle -A local-source -j RETURN \
+       -d ff00::/8
+run ip46tables -t mangle -A local-source -g bad-source-address
 run iptables -t mangle -A in-classify -j local-source \
        -m addrtype --src-type LOCAL
+for addr in $host_6addrs; do
+  run ip6tables -t mangle -A in-classify -j local-source \
+         -s $addr
+done
 
 m4_divert(41)m4_dnl
 ## Define the important networks.
@@ -97,7 +103,7 @@ done
 m4_divert(46)m4_dnl
 ## Mark addresses reachable on non-default interfaces as not reachable on the
 ## default interface.
-trace "nets = $allnets"
+trace "nets = $allnets $allnets6"
 for net in $allnets; do
   case $net in
     "$defaultiface":*)
@@ -108,6 +114,16 @@ for net in $allnets; do
       ;;
   esac
 done
+for net in $allnets6; do
+  case $net in
+    "$defaultiface":*)
+      ;;
+    *)
+      run ip6tables -t mangle -A in-$defaultiface \
+             -s ${net#*:} -g bad-source-address
+      ;;
+  esac
+done
 
 ## Fill in the black holes in the network.
 for addr in \
@@ -116,17 +132,23 @@ for addr in \
 do
   run iptables -t mangle -A in-default -s $addr -g bad-source-address
 done
+for addr in \
+       fc00::/7 \
+       2001:0db8::/32
+do
+  run ip6tables -t mangle -A in-default -s $addr -g bad-source-address
+done
 
 m4_divert(92)m4_dnl
 ## Put the final default decision on the in-default chain, and attach the
 ## classification chains to the PREROUTING hook.
-run iptables -t mangle -A in-$defaultiface -g mark-from-$defaultclass
-run iptables -t mangle -A PREROUTING -j in-classify
-run iptables -t mangle -A PREROUTING -j out-classify
+run ip46tables -t mangle -A in-$defaultiface -g mark-from-$defaultclass
+run ip46tables -t mangle -A PREROUTING -j in-classify
+run ip46tables -t mangle -A PREROUTING -j out-classify
 
 ## Now it's safe to let stuff through.
 for i in PREROUTING INPUT FORWARD OUTPUT POSTROUTING; do
-  run iptables -t mangle -P $i ACCEPT
+  run ip46tables -t mangle -P $i ACCEPT
 done
 
 m4_divert(-1)