add check for forwarding and masquerading

Signed-off-by: Andrei Kvapil <[email protected]>

hack/e2e.sh

@@ -8,6 +8,15 @@ if [ "$COZYSTACK_INSTALLER_YAML" = "" ]; then
   exit 1
 fi
 
+if [ "$(cat /proc/sys/net/ipv4/ip_forward)" != 1 ]; then
+  echo "IPv4 forwarding is not enabled!" >&2
+  echo 'please enable forwarding with the following command:' >&2
+  echo >&2
+  echo 'echo 1 > /proc/sys/net/ipv4/ip_forward' >&2
+  echo >&2
+  exit 1
+fi
+
 set -x
 set -e
 
@@ -18,6 +27,10 @@ ip link add cozy-br0 type bridge
 ip link set cozy-br0 up
 ip addr add 192.168.123.1/24 dev cozy-br0
 
+# Enable masquerading
+iptables -t nat -D POSTROUTING -s 192.168.123.0/24 ! -d 192.168.123.0/24 -j MASQUERADE || true
+iptables -t nat -A POSTROUTING -s 192.168.123.0/24 ! -d 192.168.123.0/24 -j MASQUERADE
+
 rm -rf srv1 srv2 srv3
 mkdir -p srv1 srv2 srv3