1 files changed, 216 insertions, 0 deletions
diff --git a/hicn-light/src/socket/api.h b/hicn-light/src/socket/api.h
new file mode 100755
index 000000000..e1516ebe1
--- /dev/null
+++ b/hicn-light/src/socket/api.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 2017-2019 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.
+ */
+
+/**
+ * @file hicn_face.h
+ * @brief hICN socket library
+ *
+ * This module provides an interface to managing so-called hICN sockets,
+ * realizing punting of interest and data packets using a TUN device.
+ */
+
+#ifndef HICN_SOCKET_API_H
+#define HICN_SOCKET_API_H
+
+#include <stdint.h>  // uint*_t
+#include <stdlib.h>
+
+#include <hicn/hicn.h>
+#include "error.h"
+
+#define BUFSIZE 4096
+#define MAX_CONNECTIONS \
+  255  // We currently limit the number of connections we can establish
+#define IF_NAMESIZE 16
+
+/* hICN socket helper */
+
+/** hICN configuration options */
+typedef struct {
+  // uint32_t interval;
+
+  /* Identifier used to name hICN TUN interfaces (should be unique) */
+  char *identifier;
+  // hicn_format_t format;
+
+} hicn_conf_t;
+
+/**
+ * hICN adjacency
+ */
+typedef struct {
+  char *local_ip_address;
+  char *gateway_ip_address;
+} hicn_adjacency_t;
+
+#define EMPTY_HICN_ADJACENCY \
+  (hicn_adjacency_t) { 0, 0 }
+
+/* hICN socket operations */
+
+typedef struct {
+  uint8_t pkbuf[BUFSIZE];
+  uint32_t rb_pkbuf_r;
+  uint32_t rb_pkbuf_w;
+} hicn_buffer_t;
+
+typedef enum { HS_UNSPEC, HS_LISTENER, HS_CONNECTION } hicn_socket_type_t;
+
+typedef struct hicn_socket_s {
+  hicn_socket_type_t type;
+  int fd;
+
+  /* Implementation specific state follows */
+  char tun_name[IF_NAMESIZE];
+  uint32_t tun_id;
+
+  hicn_buffer_t buffer;
+  void (*cb)(struct hicn_socket_s *, void *, uint8_t *, size_t);
+  void *cb_data;
+
+  union {
+    struct {
+      ip_address_t tun_ip_address;
+      uint32_t interface_id;
+
+      /* ID of the corresponding table : avoid default values of 0, 32766 and
+       * 32767 */
+      uint8_t table_id;
+    } connection;
+  };
+} hicn_socket_t;
+
+/**
+ * hICN global state
+ */
+typedef struct {
+  /* Configuration data */
+  hicn_conf_t *conf;
+
+  // We need state associate to each FD, to know what type of socket it is and
+  // its state.
+  void *socket_root; /**< A tree of socket indexed by their fd */
+
+} hicn_socket_helper_t;
+
+/**
+ * Create an hICN instance.
+ *
+ * This is used to configure the state of an hICN router consistently between
+ * a listener and the different connections. It also regroups all the state
+ * related to hICN functionalities.
+ *
+ * @return A pointer to an hICN instance.
+ */
+hicn_socket_helper_t *hicn_create();
+
+void hicn_destroy();
+
+/**
+ * Retrieve hICN configuration.
+ *
+ * Gets the current configuration of an hICN instance for information purposes,
+ * or later update it.
+ *
+ * TODO
+ *  - We might want to prevent configuration updates while the hICN instance is
+ *  running. Define running...
+ *
+ * @param [in] hicn Pointer to hICN instance.
+ * @return Pointer to an hICN configuration data structure.
+ *
+ * @see hicn_set_conf
+ */
+hicn_conf_t *hicn_get_conf(hicn_socket_helper_t *hicn);
+
+/**
+ * Update hICN configuration.
+ *
+ * @param [in] hicn Pointer to an hICN instance.
+ * @param [in] hicn_conf Pointer to an hICN configuration data structure.
+ * @return 0 in case of success, -1 otherwise.
+ *
+ * @see hicn_get_conf
+ */
+int hicn_set_conf(hicn_socket_helper_t *hicn, hicn_conf_t *hicn_conf);
+
+/**
+ * Release hICN state.
+ *
+ * @param [in] hicn Pointer to an hICN instance.
+ */
+void hicn_free(hicn_socket_helper_t *hicn);
+
+// FIXME doc
+int hicn_get_local_address(const ip_address_t *remote_address,
+                           ip_address_t *local_address);
+
+/* hICN socket */
+
+/**
+ * Create an hICN socket.
+ *
+ * An hICN socket abstracts the underlying implementation and allows hICN
+ * packets to be sent and received independently of the underlying
+ * implementation.
+ *
+ * It is possible to further specialize the socket in a listener socket, and a
+ * connection socket.
+ *
+ * @param [in] hicn Pointer to an hICN instance.
+ * @param [in] identifier Unique identifier for this socket, used to named the
+ *      TUN device
+ * @param [in] local_ip_address IP address used locally by the socket (or NULL
+ *      for letting the library decide automatically).
+ * @return File descriptor (>0) in case of success, -1 otherwise.
+ *
+ * @see hicn_listen
+ * @see hicn_bind
+ */
+int hicn_socket(hicn_socket_helper_t *hicn, const char *identifier,
+                const char *local_ip_address);
+
+/**
+ * Packet punting.
+ *
+ * Note that we cannot listen on a socket that is already bound.
+ *
+ * @param [in] hicn Pointer to an hICN instance.
+ * @param [in] fd File descriptor identifying the hICN socket.
+ * @param [in] prefix Prefix (IPv4 or IPv6) to be bound to hICN in
+ *    RFC-compliant presentation format.
+ * @return 0 in case of success, -1 otherwise.
+ *
+ * @see hicn_socket
+ */
+int hicn_listen(hicn_socket_helper_t *hicn, int fd, const char *prefix);
+
+/**
+ * Packet forwarding
+ * @param [in] hicn Pointer to an hICN instance.
+ * @param [in] fd File descriptor identifying the hICN socket.
+ * @param [in] prefix Prefix (IPv4 or IPv6) to be bound to hICN in
+ *    RFC-compliant presentation format.
+ * @return 0 in case of success, -1 otherwise.
+ *
+ * XXX adjacency does not perform any copy heresofar
+ *
+ * @see hicn_socket
+ */
+int hicn_bind(hicn_socket_helper_t *hicn, int fd,
+              const char *remote_ip_address);
+
+#endif /* HICN_SOCKET_API_H */