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>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/plugins/npt66/npt66.h b/src/plugins/npt66/npt66.h
new file mode 100644
index 00000000000..428dadb1672
--- /dev/null
+++ b/src/plugins/npt66/npt66.h
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright(c) 2023 Cisco Systems, Inc.
+
+#include <vlib/vlib.h>
+#include <vnet/ip/ip6_packet.h>
+
+typedef struct
+{
+  u32 sw_if_index;
+  ip6_address_t internal;
+  ip6_address_t external;
+  u8 internal_plen;
+  u8 external_plen;
+  uword delta;
+} npt66_binding_t;
+typedef struct
+{
+  u32 *interface_by_sw_if_index;
+  npt66_binding_t *bindings;
+  u16 msg_id_base;
+} npt66_main_t;
+
+extern npt66_main_t npt66_main;
+
+int npt66_binding_add_del (u32 sw_if_index, ip6_address_t *internal,
+			   int internal_plen, ip6_address_t *external,
+			   int external_plen, bool is_add);
+npt66_binding_t *npt66_interface_by_sw_if_index (u32 sw_if_index);