From 2bcaaf01a5fcc2d2ce618da6af30a43a70d03d80 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Sun, 3 Nov 2013 05:54:11 +0100
Subject: Use a dedicated, non-routable, IPv4 for IPSec.

At the each IPSec end-point the traffic is DNAT'ed to / MASQUERADE'd
from our dedicated IP after ESP decapsulation. Also, some IP tables
ensure that alien (not coming from / going to the tunnel end-point) is
dropped.
---
 .../files/etc/network/if-post-down.d/iptables      | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100755 roles/common/files/etc/network/if-post-down.d/iptables

(limited to 'roles/common/files/etc/network/if-post-down.d')

diff --git a/roles/common/files/etc/network/if-post-down.d/iptables b/roles/common/files/etc/network/if-post-down.d/iptables
new file mode 100755
index 0000000..944ff3a
--- /dev/null
+++ b/roles/common/files/etc/network/if-post-down.d/iptables
@@ -0,0 +1,27 @@
+#!/bin/sh
+#
+# A post-down hook to flush ip tables and delete custom chains in the
+# loaded v4 and v6 rulesets.
+#
+# Copyright 2013 Guilhem Moulin <guilhem@fripost.org>
+#
+# Licensed under the GNU GPL version 3 or higher.
+#
+
+set -ue
+PATH=/usr/sbin:/usr/bin:/sbin:/bin
+
+# Ignore the loopback interface; run the script for ifdown only.
+[ "$IFACE" != lo -a "$MODE" = stop ] || exit 0
+
+case "$ADDRFAM" in
+    inet)  ipts=/sbin/iptables-save;  ipt=/sbin/iptables;;
+    inet6) ipts=/sbin/ip6tables-save; ipt=/sbin/ip6tables;;
+    *)     exit 0
+esac
+
+$ipts | sed -nr 's/^\*//p' | \
+while read table; do
+    $ipt -t "$table" -F
+    $ipt -t "$table" -X
+done
-- 
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