X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/a188f54944e56c7588f7ebbabbef3cee19686575..a4d8cae3892c13a32f941ef96b24eaa6930500cb:/functions.m4

diff --git a/functions.m4 b/functions.m4
index b2e3cb6..555072e 100644
--- a/functions.m4
+++ b/functions.m4
@@ -62,7 +62,7 @@ m4_divert(38)m4_dnl
 ###--------------------------------------------------------------------------
 ### Utility chains (used by function definitions).
 
-m4_divert(22)m4_dnl
+m4_divert(20)m4_dnl
 ###--------------------------------------------------------------------------
 ### Basic chain constructions.
 
@@ -85,10 +85,23 @@ clearchain () {
       *:*) table=${chain%:*} chain=${chain#*:} ;;
       *) table=filter ;;
     esac
-    run ip46tables -t $table -N $chain
+    run ip46tables -t $table -N $chain 2>/dev/null || :
   done
 }
 
+## makeset SET TYPE [PARAMS]
+##
+## Ensure that the named ipset exists.  Don't clear it.
+makeset () {
+  set -e
+  name=$1; shift
+  if ipset -nL | grep -q "^Name: $name$"; then
+    :
+  else
+    ipset -N "$name" "$@"
+  fi
+}
+
 ## errorchain CHAIN ACTION ARGS ...
 ##
 ## Make a chain which logs a message and then invokes some other action,
@@ -109,7 +122,7 @@ errorchain () {
   run ip46tables -t $table -A $chain -j DROP
 }
 
-m4_divert(24)m4_dnl
+m4_divert(20)m4_dnl
 ###--------------------------------------------------------------------------
 ### Basic option setting.
 
@@ -165,7 +178,7 @@ setdevopt () {
   done
 }
 
-m4_divert(26)m4_dnl
+m4_divert(20)m4_dnl
 ###--------------------------------------------------------------------------
 ### Packet filter construction.
 
@@ -206,7 +219,7 @@ run ip6tables -A accept-non-init-frag -j RETURN \
 	-m frag --fragfirst
 run ip6tables -A accept-non-init-frag -j ACCEPT
 
-m4_divert(26)m4_dnl
+m4_divert(20)m4_dnl
 ## allowservices CHAIN PROTO SERVICE ...
 ##
 ## Add rules to allow the SERVICES on the CHAIN.
@@ -293,7 +306,7 @@ openports () {
   run ip46tables -A $chain -p udp -g interesting --destination-port $1:$2
 }
 
-m4_divert(28)m4_dnl
+m4_divert(20)m4_dnl
 ###--------------------------------------------------------------------------
 ### Packet classification.