Adding node interface, SNAT and OVN Node switch port

    - Adding nfn proto for node interface MAC and IP address
    - Adding node switch ports in NFN Operator
    - Adding grpc client in nfn agent to get mac and IP address for node interface
    - Adding feature to create Node interface with OVS internal port
    - Make sure pod controller requeue the pod request for empty node field in pod spec
    - Unique node interface name using SHA and maintain 15 charactor for OVS switch port
    - Adding SNAT for default interface in each node
    - Adding iptables modules for SNAT rules

Signed-off-by: Kuralamudhan Ramakrishnan <kuralamudhan.ramakrishnan@intel.com>
Change-Id: I6cfa36e45007e796eb651345f9f0751329defcf7

1 files changed, 10 insertions, 0 deletions

diff --git a/build/bin/entrypoint b/build/bin/entrypoint
index c9646a0..b8ac7db 100755
--- a/build/bin/entrypoint
+++ b/build/bin/entrypoint
@@ -66,6 +66,15 @@ install_cni_plugins() {
     rm -rf cni-plugins-linux-$IMAGE_ARC-$CNI_VERSION.tgz
 }
 
+set_snat_default_inteface() {
+    default_interface=$(awk '$2 == 00000000 { print $1 }' /proc/net/route)
+
+    # Checking the SNAT for default interfaces                                             
+    if ! iptables -t nat -C POSTROUTING -o $default_interface -j MASQUERADE 2>/dev/null ; then
+        iptables -t nat -A POSTROUTING -o $default_interface -j MASQUERADE
+    fi
+}
+
 cmd=${1:-""}
 
 case ${cmd} in
@@ -80,6 +89,7 @@ case ${cmd} in
         cp -f $OVN4NFV_BIN_FILE $CNI_BIN_DIR
         cp -f $OVN4NFV_CONF_FILE $OVN4NFV_CONF_DIR
         cp -f $OVN4NFV_NET_CONF_FILE $CNI_CONF_DIR
+        set_snat_default_inteface
         create_kubeconfig
         install_cni_plugins
         # Sleep forever.