From 05d33f7324a18dea67816099a929a60e32c9224c Mon Sep 17 00:00:00 2001
From: Marek Gradzki <mgradzki@cisco.com>
Date: Fri, 20 Apr 2018 07:02:03 +0200
Subject: Forbid delete of default NAT instance

NAT instances are mapped to VPP's VRFs.
Default NAT instance (id=0) is mapped to default VRF,
which is allways present in VPP.

This patch forbids deleteion of default instance
to be consistent with VPP behaviour
and NAT instance reader implementation.

Change-Id: I71aa6986395e4ba67baaa75d90905b450434aca4
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>
---
 .../src/main/java/io/fd/hc2vpp/nat/write/NatInstaceCustomizer.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstaceCustomizer.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstaceCustomizer.java
index fa5cfa8e2..8e5673003 100644
--- a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstaceCustomizer.java
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstaceCustomizer.java
@@ -42,5 +42,12 @@ final class NatInstaceCustomizer implements ListWriterCustomizer<NatInstance, Na
                                         @Nonnull final NatInstance dataBefore, @Nonnull final WriteContext writeContext)
             throws WriteFailedException {
         LOG.trace("Deleting nat-instance: {}", id);
+
+        // For consistency with reader, forbid removing default NAT instance:
+        final Long vrfId = id.firstKeyOf(NatInstance.class).getId();
+        if (vrfId == 0) {
+            throw new WriteFailedException.DeleteFailedException(id,
+                new UnsupportedOperationException("Removing default NAT instance (vrf=0) is not supported."));
+        }
     }
 }
-- 
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