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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_FACE_H__
+#define __HICN_FACE_H__
+
+#include "hicn_buffer.h"
+
+#include <vnet/fib/fib_node.h>
+#include <vnet/vnet.h>
+#include <vlib/vlib.h>
+#include <vnet/ip/ip46_address.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/adj/adj_types.h>
+#include <vppinfra/bihash_8_8.h>
+#include <vnet/adj/adj_midchain.h>
+
+
+#include <vpp_plugins/hicn/error.h>
+typedef u8 hicn_face_flags_t;
+typedef index_t hicn_face_id_t;
+
+/**
+ * @file face.h
+ *
+ * This file implements a general face type. The purpose of a face is to
+ * carry the needed information to forward interest and data packets to the
+ * next node in the network. There are two type of faces: complete faces (in short
+ * faces), and incomplete faces (in short ifaces).
+ *
+ * A face that does not contain the indication of the adjacency is an
+ * incomplete face (iface), otherwise it is considered to be complete. Ifaces are
+ * used to forward data back to the previous hICN hop from which we received an
+ * interest, while faces are used to forward interest packets to the next hicn node.
+ * Faces and ifaces are created at two different points in time. Faces are created
+ * when a route is added, while ifaces are created when an interest is received.
+ * In details, faces and ifaces carry the following information:
+ * - nat_addr: the ip address to perform src nat or dst nat on interest and data packets, respectively;
+ * - pl_id: the path label
+ * - locks: the number of entities using this face. When 0 the face can be deallocated
+ * - dpo: the dpo that identifies the next node in the vlib graph for processing the vlib
+ * buffer. The dpo contains the dpo.dpoi_next field that points to the next node
+ * in the vlib graph and the dpo.dpoi_index which is an index to adj used by the next node
+ * to perform the l2 rewrite. In case of ifaces, it is likely we don't know the
+ * adjacency when creting the face. In this case, the next node in the vlib graph
+ * will be the node that performs a lookup in the fib. Only in case of udp tunnels,
+ * which are bidirectional tunnel we know that the incoming tunnel is also the outgoing
+ * one, therefore in this case we store the tunnel in the dpo.dpoi_index fields. For
+ * all the other tunnels (which are most likely unidirectional), the source address of
+ * the interest will be used to retrieve the outgoing tunnel when sending the corresponding
+ * data back.
+ * - sw_if: the incoming interface of the interest
+ * - fib_node, fib_entry_index and fib_sibling are information used to be notified of
+ * changes in the adjacency pointed by the dpo.
+ *
+ * We maintain two hash tables to retrieve faces and ifaces. In particular one hash table which
+ * index faces and ifaces for nat_address, sw_if and dpo. This is used to retrieve existing faces
+ * or ifaces when an interest is received and when an new face is created. A second hash table that
+ * indexes vectors of faces for nat_address and sw_if. This is used to retrieve a list of possible
+ * incoming faces when a data is received.
+ */
+
+/**
+ * @brief Structure representing a face. It containes the fields shared among
+ * all the types of faces as well it leaves some space for storing additional
+ * information specific to each type.
+ */
+typedef struct __attribute__ ((packed)) hicn_face_s
+{
+ /* Flags to idenfity if the face is incomplete (iface), complete (face) */
+ /* And a network or application face (1B) */
+ hicn_face_flags_t flags;
+
+ /* Align the upcoming fields */
+ u8 align;
+
+ /* Path label (2B) */
+ u16 pl_id;
+
+ /* Number of dpo holding a reference to the dpoi (4B) */
+ u32 locks;
+
+ /* Dpo for the adjacency (8B) */
+ union {
+ dpo_id_t dpo;
+ u64 align_dpo;
+ };
+
+ /* Local address of the interface sw_if */
+ ip46_address_t nat_addr;
+
+ /* local interface for the local ip address */
+ u32 sw_if;
+
+ fib_node_t fib_node;
+
+ fib_node_index_t fib_entry_index;
+
+ u32 fib_sibling;
+} hicn_face_t;
+
+/* Pool of faces */
+extern hicn_face_t *hicn_dpoi_face_pool;
+
+/* Flags */
+/* A face is complete and it stores all the information. A iface lacks of the
+ adj index, therefore sending a packet through a iface require a lookup in
+ the FIB. */
+#define HICN_FACE_FLAGS_DEFAULT 0x00
+#define HICN_FACE_FLAGS_FACE 0x01
+#define HICN_FACE_FLAGS_IFACE 0x02
+#define HICN_FACE_FLAGS_APPFACE_PROD 0x04 /* Currently only IP face can be appface */
+#define HICN_FACE_FLAGS_APPFACE_CONS 0x08 /* Currently only IP face can be appface */
+#define HICN_FACE_FLAGS_DELETED 0x10
+
+#define HICN_FACE_NULL (hicn_face_id_t) ~0
+
+#define HICN_FACE_FLAGS_APPFACE_PROD_BIT 2
+#define HICN_FACE_FLAGS_APPFACE_CONS_BIT 3
+
+STATIC_ASSERT ((1 << HICN_FACE_FLAGS_APPFACE_PROD_BIT) ==
+ HICN_FACE_FLAGS_APPFACE_PROD,
+ "HICN_FACE_FLAGS_APPFACE_PROD_BIT and HICN_FACE_FLAGS_APPFACE_PROD must correspond");
+
+STATIC_ASSERT ((1 << HICN_FACE_FLAGS_APPFACE_CONS_BIT) ==
+ HICN_FACE_FLAGS_APPFACE_CONS,
+ "HICN_FACE_FLAGS_APPFACE_CONS_BIT and HICN_FACE_FLAGS_APPFACE_CONS must correspond");
+
+STATIC_ASSERT ((HICN_FACE_FLAGS_APPFACE_PROD >>
+ HICN_FACE_FLAGS_APPFACE_PROD_BIT) ==
+ HICN_BUFFER_FLAGS_FACE_IS_APP,
+ "hicn buffer app flag does not correspond to HICN_FACE_FLAGS_APPFACE_PROD");
+
+STATIC_ASSERT ((HICN_FACE_FLAGS_APPFACE_CONS >>
+ HICN_FACE_FLAGS_APPFACE_CONS_BIT) ==
+ HICN_BUFFER_FLAGS_FACE_IS_APP,
+ "hicn buffer app flag does not correspond to HICN_FACE_FLAGS_APPFACE_PROD");
+
+/**
+ * @brief Definition of the virtual functin table for an hICN FACE DPO.
+ */
+typedef struct hicn_face_vft_s
+{
+ u8 *(*format_face) (u8 * s, va_list * args);
+ /**< Format an hICN face dpo*/
+ int (*hicn_face_del) (hicn_face_id_t face_id);
+ void (*hicn_face_get_dpo) (hicn_face_t * face, dpo_id_t * dpo);
+} hicn_face_vft_t;
+
+#define foreach_hicn_face_counter \
+ _(INTEREST_RX, 0, "Interest rx") \
+ _(INTEREST_TX, 1, "Interest tx") \
+ _(DATA_RX, 2, "Data rx") \
+ _(DATA_TX, 3, "Data tx") \
+
+typedef enum
+{
+#define _(a,b,c) HICN_FACE_COUNTERS_##a = (b),
+ foreach_hicn_face_counter
+#undef _
+ HICN_N_COUNTER
+} hicn_face_counters_t;
+
+extern mhash_t hicn_face_hashtb;
+
+extern const char *HICN_FACE_CTRX_STRING[];
+
+#define get_face_counter_string(ctrxno) (char *)(HICN_FACE_CTRX_STRING[ctrxno])
+
+
+/* Vector maintaining a dpo per face */
+extern dpo_id_t *face_dpo_vec;
+extern hicn_face_vft_t *face_vft_vec;
+
+/* Vector holding the set of face names */
+extern char **face_type_names_vec;
+
+/* First face type registered in the sytem.*/
+extern dpo_type_t first_type;
+
+/* Per-face counters */
+extern vlib_combined_counter_main_t *counters;
+
+/**
+ * @brief Return the face id from the face object
+ *
+ * @param Pointer to the face state
+ * @return face id
+ */
+always_inline hicn_face_id_t
+hicn_dpoi_get_index (hicn_face_t * face_dpoi)
+{
+ return face_dpoi - hicn_dpoi_face_pool;
+}
+
+/**
+ * @brief Return the face object from the face id.
+ * This method is robust to invalid face id.
+ *
+ * @param dpoi_index Face identifier
+ * @return Pointer to the face or NULL
+ */
+always_inline hicn_face_t *
+hicn_dpoi_get_from_idx_safe (hicn_face_id_t dpoi_index)
+{
+ if (!pool_is_free_index(hicn_dpoi_face_pool, dpoi_index))
+ return (hicn_face_t *) pool_elt_at_index (hicn_dpoi_face_pool, dpoi_index);
+ else
+ return NULL;
+}
+
+/**
+ * @brief Return the face from the face id. Face id must be valid.
+ *
+ * @param dpoi_index Face identifier
+ * @return Pointer to the face
+ */
+always_inline hicn_face_t *
+hicn_dpoi_get_from_idx (hicn_face_id_t dpoi_index)
+{
+ return (hicn_face_t *) pool_elt_at_index (hicn_dpoi_face_pool, dpoi_index);
+}
+
+/**
+ * @brief Return true if the face id belongs to an existing face
+ */
+always_inline int
+hicn_dpoi_idx_is_valid (hicn_face_id_t face_id)
+{
+ return pool_len (hicn_dpoi_face_pool) > face_id
+ && !pool_is_free_index (hicn_dpoi_face_pool, face_id);
+}
+
+
+/**
+ * @brief Add a lock to the face dpo
+ *
+ * @param dpo Pointer to the face dpo
+ */
+always_inline void
+hicn_face_lock_with_id (hicn_face_id_t face_id)
+{
+ hicn_face_t *face;
+ face = hicn_dpoi_get_from_idx (face_id);
+ face->locks++;
+}
+
+/**
+ * @brief Remove a lock to the face dpo. Deallocate the face id locks == 0
+ *
+ * @param dpo Pointer to the face dpo
+ */
+always_inline void
+hicn_face_unlock_with_id (hicn_face_id_t face_id)
+{
+ hicn_face_t *face;
+ face = hicn_dpoi_get_from_idx (face_id);
+ face->locks--;
+}
+
+/**
+ * @brief Add a lock to the face through its dpo
+ *
+ * @param dpo Pointer to the face dpo
+ */
+always_inline void
+hicn_face_lock (dpo_id_t * dpo)
+{
+ hicn_face_lock_with_id(dpo->dpoi_index);
+}
+
+/**
+ * @brief Remove a lock to the face through its dpo. Deallocate the face id locks == 0
+ *
+ * @param dpo Pointer to the face dpo
+ */
+always_inline void
+hicn_face_unlock (dpo_id_t * dpo)
+{
+ hicn_face_unlock_with_id (dpo->dpoi_index);
+}
+
+
+/**
+ * @brief Init the internal structures of the face module
+ *
+ * Must be called before processing any packet
+ */
+void hicn_face_module_init (vlib_main_t * vm);
+
+u8 * format_hicn_face (u8 * s, va_list * args);
+
+
+/**
+ * @brief Format all the existing faces
+ *
+ * @param s Pointer to a previous string. If null it will be initialize
+ * @param n Number of input parameters
+ * @return String with the faces formatted
+ */
+u8 *format_hicn_face_all (u8 * s, int n, ...);
+
+/**
+ * @brief Delete a face
+ *
+ * @param face_id Id of the face to delete
+ * @return HICN_ERROR_FACE_NOT_FOUND if the face does not exist, otherwise
+ * HICN_ERROR_NONE
+ */
+int hicn_face_del (hicn_face_id_t face_id);
+
+/**
+ * @bried vector of faces used to collect faces having the same local address
+ *
+ */
+typedef hicn_face_id_t *hicn_face_vec_t;
+
+typedef struct hicn_input_faces_s_
+{
+ /* Vector of all possible input faces */
+ u32 vec_id;
+
+ /* Preferred face. If an prod_app face is in the vector it will be the preferred one. */
+ /* It's not possible to have multiple prod_app face in the same vector, they would have */
+ /* the same local address. Every prod_app face is a point-to-point face between the forwarder */
+ /* and the application. */
+ hicn_face_id_t face_id;
+
+} hicn_face_input_faces_t;
+
+/**
+ * Pool containing the vector of possible incoming faces.
+ */
+extern hicn_face_vec_t *hicn_vec_pool;
+
+/**
+ * Hash tables that indexes a face by remote address. For fast lookup when an
+ * interest arrives.
+ */
+extern mhash_t hicn_face_vec_hashtb;
+
+
+/**
+ * Key definition for the mhash table. An face is uniquely identified by ip
+ * address, the interface id and a dpo pointing to the next node in the vlib graph.
+ * The ip address can correspond to the remote ip address of the next hicn hop,
+ * or to the local address of the receiving interface. The former is used to
+ * retrieve the incoming face when an interest is received, the latter when
+ * the arring packet is a data. If the face is a regular face
+ * In case of iface, the following structure can be filled in different ways:
+ * - dpo equal to DPO_INVALID when the iface is a regular hICN iface
+ * - in case of udp_tunnel dpo =
+ * {
+ * .dpoi_index = tunnel_id,
+ * .dpoi_type = DPO_FIRST, //We don't need the type, we leave it invalid
+ * .dpoi_proto = DPO_PROTO_IP4 or DPO_PROTO_IP6,
+ * .dpoi_next_node = HICN6_IFACE_OUTPUT_NEXT_UDP4_ENCAP or
+ * HICN6_IFACE_OUTPUT_NEXT_UDP6_ENCAP or
+ * HICN4_IFACE_OUTPUT_NEXT_UDP4_ENCAP or
+ * HICN4_IFACE_OUTPUT_NEXT_UDP6_ENCAP
+ * }
+ */
+typedef struct __attribute__ ((packed)) hicn_face_key_s
+{
+ ip46_address_t addr;
+ union {
+ dpo_id_t dpo;
+ u64 align_dpo;
+ };
+ u32 sw_if;
+} hicn_face_key_t;
+
+/**
+ * @brief Create the key object for the mhash. Fill in the key object with the
+ * expected values.
+ *
+ * @param addr nat address of the face
+ * @param sw_if interface associated to the face
+ * @param key Pointer to an allocated hicn_face_ip_key_t object
+ */
+always_inline void
+hicn_face_get_key (const ip46_address_t * addr,
+ u32 sw_if, const dpo_id_t * dpo, hicn_face_key_t * key)
+{
+ key->dpo = *dpo;
+ key->addr = *addr;
+ key->sw_if = sw_if;
+}
+
+/**
+ * @brief Get the face obj from the nat address. Does not add any lock.
+ *
+ * @param addr Ip v4 address used to create the key for the hash table.
+ * @param sw_if Software interface id used to create the key for the hash table.
+ * @param hashtb Hash table (remote or local) where to perform the lookup.
+ *
+ * @result Pointer to the face.
+ */
+always_inline hicn_face_t *
+hicn_face_get (const ip46_address_t * addr, u32 sw_if, mhash_t * hashtb, index_t adj_index)
+{
+ hicn_face_key_t key;
+
+ dpo_id_t dpo = DPO_INVALID;
+
+ dpo.dpoi_index = adj_index;
+
+ hicn_face_get_key (addr, sw_if, &dpo, &key);
+
+ hicn_face_id_t *dpoi_index = (hicn_face_id_t *) mhash_get (hashtb,
+ &key);
+
+ if ( dpoi_index != NULL)
+ {
+ hicn_face_lock_with_id(*dpoi_index);
+ return hicn_dpoi_get_from_idx (*dpoi_index);
+ }
+
+ return NULL;
+}
+
+/**
+ * @brief Get the face obj from the nat address and the dpo. Does not add any lock.
+ *
+ * @param addr Ip v4 address used to create the key for the hash table.
+ * @param sw_if Software interface id used to create the key for the hash table.
+ * @param hashtb Hash table (remote or local) where to perform the lookup.
+ *
+ * @result Pointer to the face.
+ */
+always_inline hicn_face_t *
+hicn_face_get_with_dpo (const ip46_address_t * addr, u32 sw_if, const dpo_id_t * dpo, mhash_t * hashtb)
+{
+ hicn_face_key_t key;
+
+ hicn_face_get_key (addr, sw_if, dpo, &key);
+
+ hicn_face_id_t *dpoi_index = (hicn_face_id_t *) mhash_get (hashtb,
+ &key);
+
+ if ( dpoi_index != NULL)
+ {
+ hicn_face_lock_with_id(*dpoi_index);
+ return hicn_dpoi_get_from_idx (*dpoi_index);
+ }
+
+ return NULL;
+}
+
+/**
+ * @brief Get the vector of faces from the ip v4 address. Does not add any lock.
+ *
+ * @param addr Ip v4 address used to create the key for the hash table.
+ * @param sw_if Software interface id used to create the key for the hash table.
+ * @param hashtb Hash table (remote or local) where to perform the lookup.
+ *
+ * @result Pointer to the face.
+ */
+always_inline hicn_face_input_faces_t *
+hicn_face_get_vec (const ip46_address_t * addr,
+ mhash_t * hashtb)
+{
+ hicn_face_key_t key;
+
+ dpo_id_t dpo = DPO_INVALID;
+
+ hicn_face_get_key (addr, 0, &dpo, &key);
+ return (hicn_face_input_faces_t *) mhash_get (hashtb, &key);
+}
+
+/**
+ * @brief Create a new face ip. API for other modules (e.g., routing)
+ *
+ * @param dpo_nh dpo contained in the face that points to the next node in
+ * the vlib graph
+ * @param nat_addr nat ip v4 or v6 address of the face
+ * @param sw_if interface associated to the face
+ * @param pfaceid Pointer to return the face id
+ * @param is_app_prod if HICN_FACE_FLAGS_APPFACE_PROD the face is a local application face, all other values are ignored
+ * @return HICN_ERROR_FACE_NO_GLOBAL_IP if the face does not have a globally
+ * reachable ip address, otherwise HICN_ERROR_NONE
+ */
+int hicn_face_add (const dpo_id_t * dpo_nh,
+ ip46_address_t * nat_address,
+ int sw_if,
+ hicn_face_id_t * pfaceid,
+ u8 is_app_prod);
+
+/**
+ * @brief Create a new incomplete face ip. (Meant to be used by the data plane)
+ *
+ * @param local_addr Local ip v4 or v6 address of the face
+ * @param remote_addr Remote ip v4 or v6 address of the face
+ * @param sw_if interface associated to the face
+ * @param pfaceid Pointer to return the face id
+ * @return HICN_ERROR_FACE_NO_GLOBAL_IP if the face does not have a globally
+ * reachable ip address, otherwise HICN_ERROR_NONE
+ */
+always_inline void
+hicn_iface_add (ip46_address_t * nat_address, int sw_if,
+ hicn_face_id_t * pfaceid, dpo_proto_t proto,
+ u32 adj_index)
+{
+ hicn_face_t *face;
+ pool_get (hicn_dpoi_face_pool, face);
+
+ clib_memcpy (&(face->nat_addr), nat_address,
+ sizeof (ip46_address_t));
+ face->sw_if = sw_if;
+
+ face->dpo.dpoi_type = DPO_FIRST;
+ face->dpo.dpoi_proto = DPO_PROTO_NONE;
+ face->dpo.dpoi_index = adj_index;
+ face->dpo.dpoi_next_node = 0;
+ face->pl_id = (u16) 0;
+ face->flags = HICN_FACE_FLAGS_IFACE;
+ face->locks = 1;
+
+ hicn_face_key_t key;
+ hicn_face_get_key (nat_address, sw_if, &face->dpo, &key);
+ *pfaceid = hicn_dpoi_get_index (face);
+
+ mhash_set_mem (&hicn_face_hashtb, &key, (uword *) pfaceid, 0);
+
+ for (int i = 0; i < HICN_N_COUNTER; i++)
+ {
+ vlib_validate_combined_counter (&counters[(*pfaceid) * HICN_N_COUNTER],
+ i);
+ vlib_zero_combined_counter (&counters[(*pfaceid) * HICN_N_COUNTER], i);
+ }
+}
+
+/**** Helpers to manipulate faces and ifaces from the face/iface input nodes ****/
+
+/**
+ * @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_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_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_iface_ip4_add_and_lock (hicn_face_id_t * index,
+ u8 * hicnb_flags,
+ const ip4_address_t * nat_addr,
+ u32 sw_if, u32 adj_index, 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, adj_index);
+
+ if (face == NULL)
+ {
+ hicn_face_id_t idx;
+ hicn_iface_add (&ip_address, sw_if, &idx, DPO_PROTO_IP4, adj_index);
+
+ face = hicn_dpoi_get_from_idx(idx);
+
+ face->dpo.dpoi_type = DPO_FIRST;
+ face->dpo.dpoi_proto = DPO_PROTO_IP4;
+ face->dpo.dpoi_index = adj_index;
+ face->dpo.dpoi_next_node = node_index;
+
+ /* if (nat_addr->as_u32 == 0) */
+ /* { */
+ adj_nbr_walk(face->sw_if,
+ FIB_PROTOCOL_IP4,
+ hicn4_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 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_iface_ip6_add_and_lock (hicn_face_id_t * index,
+ u8 * hicnb_flags,
+ const ip6_address_t * nat_addr,
+ u32 sw_if, u32 adj_index, 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, adj_index);
+
+ if (face == NULL)
+ {
+ hicn_face_id_t idx;
+ hicn_iface_add ((ip46_address_t *) nat_addr, sw_if, &idx, DPO_PROTO_IP6, adj_index);
+
+ face = hicn_dpoi_get_from_idx(idx);
+
+ face->dpo.dpoi_type = DPO_FIRST;
+ face->dpo.dpoi_proto = DPO_PROTO_IP6;
+ face->dpo.dpoi_index = adj_index;
+ face->dpo.dpoi_next_node = node_index;
+
+ 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);
+}
+
+#endif // __HICN_FACE_H__
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */