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diff --git a/hicn-plugin/src/faces/dpo_face.h b/hicn-plugin/src/faces/dpo_face.h
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+/*
+ * Copyright (c) 2017-2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __HICN_DPO_H__
+#define __HICN_DPO_H__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/adj/adj_midchain.h>
+
+#include "face.h"
+#include "../error.h"
+
+/**
+ * @brief Initialize the internal structures of the dpo ip face module.
+ */
+//void hicn_dpo_ip_module_init (void);
+
+
+/**
+ * @brief Retrieve a vector of faces from the ip4 local address and returns its index.
+ *
+ * @param vec: Result of the lookup. If no face exists for the local address vec = NULL
+ * @param hicnb_flags: Flags that indicate whether the face is an application
+ * face or not
+ * @param local_addr: Ip v4 nat address of the face
+ * @param sw_if: software interface id of the face
+ *
+ * @result HICN_ERROR_FACE_NOT_FOUND if the face does not exist, otherwise HICN_ERROR_NONE.
+ */
+always_inline int
+hicn_dpo_face_ip4_lock (hicn_face_id_t * face_id,
+ u32 * in_faces_vec_id,
+ u8 * hicnb_flags,
+ const ip4_address_t * nat_addr)
+{
+ ip46_address_t ip_address = {0};
+ ip46_address_set_ip4(&ip_address, nat_addr);
+ hicn_face_input_faces_t *in_faces_vec =
+ hicn_face_get_vec (&ip_address, &hicn_face_vec_hashtb);
+
+ if (PREDICT_FALSE (in_faces_vec == NULL))
+ return HICN_ERROR_FACE_NOT_FOUND;
+
+ *in_faces_vec_id = in_faces_vec->vec_id;
+ hicn_face_t *face = hicn_dpoi_get_from_idx (in_faces_vec->face_id);
+
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+ *hicnb_flags |=
+ (face->flags & HICN_FACE_FLAGS_APPFACE_PROD) >>
+ HICN_FACE_FLAGS_APPFACE_PROD_BIT;
+
+ *face_id = in_faces_vec->face_id;
+
+ return HICN_ERROR_NONE;
+}
+
+/**
+ * @brief Retrieve a face from the ip6 local address and returns its dpo. This
+ * method adds a lock on the face state.
+ *
+ * @param dpo: Result of the lookup. If the face doesn't exist dpo = NULL
+ * @param hicnb_flags: Flags that indicate whether the face is an application
+ * face or not
+ * @param nat_addr: Ip v6 nat address of the face
+ * @param sw_if: software interface id of the face
+ *
+ * @result HICN_ERROR_FACE_NOT_FOUND if the face does not exist, otherwise HICN_ERROR_NONE.
+ */
+always_inline int
+hicn_dpo_face_ip6_lock (hicn_face_id_t * face_id,
+ u32 * in_faces_vec_id,
+ u8 * hicnb_flags,
+ const ip6_address_t * nat_addr)
+{
+ hicn_face_input_faces_t *in_faces_vec =
+ hicn_face_get_vec ((ip46_address_t *)nat_addr, &hicn_face_vec_hashtb);
+
+ if (PREDICT_FALSE (in_faces_vec == NULL))
+ return HICN_ERROR_FACE_NOT_FOUND;
+
+ *in_faces_vec_id = in_faces_vec->vec_id;
+ hicn_face_t *face = hicn_dpoi_get_from_idx (in_faces_vec->face_id);
+
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+ *hicnb_flags |=
+ (face->flags & HICN_FACE_FLAGS_APPFACE_PROD) >>
+ HICN_FACE_FLAGS_APPFACE_PROD_BIT;
+
+ *face_id = in_faces_vec->face_id;
+
+ return HICN_ERROR_NONE;
+}
+
+/**
+ * @brief Call back to get the adj of the tunnel
+ */
+static adj_walk_rc_t
+hicn4_iface_adj_walk_cb (adj_index_t ai,
+ void *ctx)
+{
+
+ hicn_face_t *face = (hicn_face_t *)ctx;
+
+ dpo_set(&face->dpo, DPO_ADJACENCY_MIDCHAIN, DPO_PROTO_IP4, ai);
+ adj_nbr_midchain_stack(ai, &face->dpo);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+/**
+ * @brief Retrieve, or create if it doesn't exist, a face from the ip6 local
+ * address and returns its dpo. This method adds a lock on the face state.
+ *
+ * @param dpo: Result of the lookup
+ * @param hicnb_flags: Flags that indicate whether the face is an application
+ * face or not
+ * @param nat_addr: Ip v4 remote address of the face
+ * @param sw_if: software interface id of the face
+ * @param node_index: vlib edge index to use in the packet processing
+ */
+always_inline void
+hicn_dpo_iface_ip4_add_and_lock (hicn_face_id_t * index,
+ u8 * hicnb_flags,
+ const ip4_address_t * nat_addr,
+ u32 sw_if, u32 node_index)
+{
+ /*All (complete) faces are indexed by remote addess as well */
+
+ ip46_address_t ip_address = {0};
+ ip46_address_set_ip4(&ip_address, nat_addr);
+
+ /* if the face exists, it adds a lock */
+ hicn_face_t *face =
+ hicn_face_get (&ip_address, sw_if, &hicn_face_hashtb);
+
+ if (face == NULL)
+ {
+ hicn_face_id_t idx;
+ hicn_iface_add (&ip_address, sw_if, &idx, DPO_PROTO_IP4);
+
+ face = hicn_dpoi_get_from_idx(idx);
+
+ if (nat_addr->as_u32 == 0)
+ {
+ adj_nbr_walk(face->sw_if,
+ FIB_PROTOCOL_IP4,
+ hicn4_iface_adj_walk_cb,
+ face);
+ }
+ else
+ {
+ face->dpo.dpoi_type = DPO_FIRST;
+ face->dpo.dpoi_proto = DPO_PROTO_IP4;
+ face->dpo.dpoi_index = ~0;
+ face->dpo.dpoi_next_node = node_index;
+ }
+
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+
+ *index = idx;
+ return;
+ }
+ else
+ {
+ /* unlock the face. We don't take a lock on each interest we receive */
+ hicn_face_id_t face_id = hicn_dpoi_get_index(face);
+ hicn_face_unlock_with_id(face_id);
+ }
+
+ /* Code replicated on purpose */
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+ *hicnb_flags |=
+ (face->flags & HICN_FACE_FLAGS_APPFACE_PROD) >>
+ HICN_FACE_FLAGS_APPFACE_PROD_BIT;
+
+ *index = hicn_dpoi_get_index (face);
+}
+
+/**
+ * @brief Call back to get the adj of the tunnel
+ */
+static adj_walk_rc_t
+hicn6_iface_adj_walk_cb (adj_index_t ai,
+ void *ctx)
+{
+
+ hicn_face_t *face = (hicn_face_t *)ctx;
+
+ ip_adjacency_t *adj = adj_get(ai);
+ if ((adj->lookup_next_index == IP_LOOKUP_NEXT_MIDCHAIN) ||
+ (adj->lookup_next_index == IP_LOOKUP_NEXT_MCAST_MIDCHAIN))
+ {
+ dpo_set(&face->dpo, DPO_ADJACENCY_MIDCHAIN, adj->ia_nh_proto, ai);
+ adj_nbr_midchain_stack(ai, &face->dpo);
+ }
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+
+/**
+ * @brief Retrieve, or create if it doesn't exist, a face from the ip6 local
+ * address and returns its dpo. This method adds a lock on the face state.
+ *
+ * @param dpo: Result of the lookup
+ * @param hicnb_flags: Flags that indicate whether the face is an application
+ * face or not
+ * @param nat_addr: Ip v6 remote address of the face
+ * @param sw_if: software interface id of the face
+ * @param node_index: vlib edge index to use in the packet processing
+ */
+always_inline void
+hicn_dpo_iface_ip6_add_and_lock (hicn_face_id_t * index,
+ u8 * hicnb_flags,
+ const ip6_address_t * nat_addr,
+ u32 sw_if, u32 node_index)
+{
+ /*All (complete) faces are indexed by remote addess as well */
+ /* if the face exists, it adds a lock */
+ hicn_face_t *face =
+ hicn_face_get ((ip46_address_t *)nat_addr, sw_if, &hicn_face_hashtb);
+
+ if (face == NULL)
+ {
+ hicn_face_id_t idx;
+ hicn_iface_add ((ip46_address_t *) nat_addr, sw_if, &idx, DPO_PROTO_IP6);
+
+ face = hicn_dpoi_get_from_idx(idx);
+
+ face->dpo.dpoi_type = DPO_FIRST;
+ face->dpo.dpoi_proto = DPO_PROTO_IP6;
+ face->dpo.dpoi_index = ~0;
+ face->dpo.dpoi_next_node = node_index;
+
+ //if (ip46_address_is_zero((ip46_address_t *)nat_addr))
+ // {
+ adj_nbr_walk(face->sw_if,
+ FIB_PROTOCOL_IP6,
+ hicn6_iface_adj_walk_cb,
+ face);
+ // }
+
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+
+ *index = idx;
+
+ return;
+ }
+ else
+ {
+ /* unlock the face. We don't take a lock on each interest we receive */
+ hicn_face_id_t face_id = hicn_dpoi_get_index(face);
+ hicn_face_unlock_with_id(face_id);
+ }
+
+ /* Code replicated on purpose */
+ *hicnb_flags = HICN_BUFFER_FLAGS_DEFAULT;
+ *hicnb_flags |=
+ (face->flags & HICN_FACE_FLAGS_APPFACE_PROD) >>
+ HICN_FACE_FLAGS_APPFACE_PROD_BIT;
+
+ *index = hicn_dpoi_get_index (face);
+}
+
+
+/* /\** */
+/* * @brief Create an ip face and its corresponding dpo. Meant to be used for the */
+/* * control plane. */
+/* * */
+/* * @param dpo: Data plane object that point to the face created. */
+/* * @param local_addr: Ip v4 local address of the face */
+/* * @param remote_addr: Ip v4 remote address of the face */
+/* * @param sw_if: software interface id of the face */
+/* * @param adj: Ip adjacency corresponding to the remote address in the face */
+/* * @param node_index: vlib edge index to use in the packet processing */
+/* * @param flags: Flags of the face */
+/* * @param face_id: Identifier for the face (dpoi_index) */
+/* * @return HICN_ERROR_FACE_ALREADY_CREATED if the face exists, otherwise HICN_ERROR_NONE */
+/* *\/ */
+/* int hicn_dpo_ip4_create (dpo_id_t * dpo, */
+/* const ip4_address_t * local_addr, */
+/* const ip4_address_t * remote_addr, */
+/* u32 sw_if, */
+/* adj_index_t adj, */
+/* u32 node_index, */
+/* hicn_face_flags_t flags, hicn_face_id_t * face_id); */
+
+/* /\** */
+/* * @brief Create an ip face and its corresponding dpo. Meant to be used for the */
+/* * control plane. */
+/* * */
+/* * @param dpo: Data plane object that point to the face created. */
+/* * @param local_addr: Ip v6 local address of the face */
+/* * @param remote_addr: Ip v6 remote address of the face */
+/* * @param sw_if: software interface id of the face */
+/* * @param adj: Ip adjacency corresponding to the remote address in the face */
+/* * @param node_index: vlib edge index to use in the packet processing */
+/* * @param flags: Flags of the face */
+/* * @param face_id: Identifier for the face (dpoi_index) */
+/* * @return HICN_ERROR_FACE_ALREADY_CREATED if the face exists, otherwise HICN_ERROR_NONE */
+/* *\/ */
+/* int hicn_dpo_ip6_create (dpo_id_t * dpo, */
+/* const ip6_address_t * local_addr, */
+/* const ip6_address_t * remote_addr, */
+/* u32 sw_if, */
+/* adj_index_t adj, */
+/* u32 node_index, */
+/* hicn_face_flags_t flags, hicn_face_id_t * face_id); */
+
+#endif // __HICN_DPO_IP_H__
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */