npt66: network prefix translation for ipv6

This is the initial commit of a NPTv6 (RFC6296) implementation for VPP.
It's restricted to a single internal to external binding and runs
as an output/input feature on the egress interface.

Type: feature
Change-Id: I0e3497af97f1ebd99377b84dbf599ecea935ca24
Signed-off-by: Ole Troan <otroan@employees.org>

src/plugins/npt66/CMakeLists.txt

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright(c) 2023 Cisco Systems, Inc.
+
+add_vpp_plugin(npt66
+  SOURCES
+  npt66.c
+  npt66_api.c
+  npt66_cli.c
+  npt66_node.c
+
+
+  MULTIARCH_SOURCES
+  npt66_node.c
+
+  API_FILES
+  npt66.api
+)