[package] firewall: add support for "local" port forwards which target an internal...

[openwrt.git] / package / firewall / files / lib / core_redirect.sh

diff --git a/package/firewall/files/lib/core_redirect.sh b/package/firewall/files/lib/core_redirect.sh
index a3e70d4..fe396c1 100644 (file)
--- a/package/firewall/files/lib/core_redirect.sh
+++ b/package/firewall/files/lib/core_redirect.sh
@@ -34,7 +34,17 @@ fw_load_redirect() {
                        return 0
                }
 
-               fwdchain="zone_${redirect_src}${redirect_dest_ip:+_forward}"
+               fwdopt=""
+               fwdchain=""
+
+               # Check whether only ports are given or whether the given dest ip is local,
+               # in this case match only DNATed traffic and allow it on input, not forward
+               if [ -z "$redirect_dest_ip" ] || /sbin/ifconfig | grep -qE "addr:${redirect_dest_ip//./\\.}\b"; then
+                       fwdopt="-m conntrack --ctstate DNAT"
+                       fwdchain="zone_${redirect_src}"
+               else
+                       fwdchain="zone_${redirect_src}_forward"
+               fi
 
                natopt="--to-destination"
                natchain="zone_${redirect_src}_prerouting"
@@ -106,10 +116,11 @@ fw_load_redirect() {
 
                        fw add $mode f ${fwdchain:-forward} ACCEPT + \
                                { $redirect_src_ip $redirect_dest_ip } { \
-                               $srcaddr ${destaddr:--m conntrack --ctstate DNAT} \
+                               $srcaddr $destaddr \
                                $pr \
                                $srcports $destports \
                                ${sm:+-m mac $sm} \
+                               $fwdopt \
                                $redirect_extra \
                        }
                done