sock: Introduction of new application layer API

sys/include/net/sock.h

@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2016 Alexander Aring <aar@pengutronix.de>
+ *                    Freie Universität Berlin
+ *                    HAW Hamburg
+ *                    Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    net_sock    Sock API
+ * @ingroup     net
+ * @brief       Provides a minimal common API for applications to connect to the
+ *              different network stacks
+ *
+ * About
+ * =====
+ *
+ * ~~~~~~~~~~~~~~~~~~~~
+ *    +---------------+
+ *    |  Application  |
+ *    +---------------+
+ *            ^
+ *            |
+ *            v
+ *          sock
+ *            ^
+ *            |
+ *            v
+ *    +---------------+
+ *    | Network Stack |
+ *    +---------------+
+ * ~~~~~~~~~~~~~~~~~~~~
+ *
+ * This module provides a minimal set of functions to establish connections or
+ * send and receives datagrams using different types of communication. Together,
+ * they serve as a common API that connects application- and network stack code.
+ *
+ * Currently the following sock types are defined:
+ *
+ * * @ref sock_ip_t (net/sock/ip.h): raw IP sock
+ * * @ref sock_tcp_t (net/sock/tcp.h): TCP sock
+ * * @ref sock_udp_t (net/sock/udp.h): UDP sock
+ *
+ * Each network stack must implement at least one sock type.
+ *
+ * Note that there might be no relation between the different sock types.
+ * For simplicity and modularity this API doesn't put any restriction of the
+ * actual implementation of the type. For example, one implementation might
+ * choose to have all sock types have a common base class or use the raw IP
+ * sock type to send e.g. UDP packets, while others will keep them
+ * completely separate from each other.
+ *
+ * How To Use
+ * ==========
+ *
+ * A RIOT application uses the functions provided by one or more of the
+ * sock type headers (for example @ref sock_udp), regardless of the
+ * network stack it uses.
+ * The network stack used under the bonnet is specified by including the
+ * appropriate module (for example USEMODULE += gnrc_sock_udp)
+ *
+ * This allows for network stack agnostic code on the application layer.
+ * The application code to establish a connection is always the same, allowing
+ * the network stack underneath to be switched simply by changing the
+ * `USEMODULE` definitions in the application's Makefile.
+ *
+ * @author  Alexander Aring <aar@pengutronix.de>
+ * @author  Simon Brummer <simon.brummer@haw-hamburg.de>
+ * @author  Cenk Gündoğan <mail@cgundogan.de>
+ * @author  Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ * @author  Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * @{
+ *
+ * @file
+ * @brief   Common sock API definitions
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ * @author  Kaspar Schleiser <kaspar@schleiser.de>
+ */
+
+#ifndef NET_SOCK_H_
+#define NET_SOCK_H_
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(DOXYGEN)
+/**
+ * @brief compile flag to activate IPv6 support for sock
+ */
+#define SOCK_HAS_IPV6
+#endif
+
+/**
+ * @brief       Common flags for @ref net_conn
+ * @name        net_sock_flags
+ * @{
+ */
+#define SOCK_FLAGS_REUSE_EP     (0x0001)    /**< allow to reuse end point on bind */
+/** @} */
+
+
+/**
+ * @brief   Special netif ID for "any interface"
+ * @todo    Use an equivalent defintion from PR #5511
+ */
+#define SOCK_ADDR_ANY_NETIF (0)
+
+/**
+ * @brief   Address to bind to any IPv4 address
+ */
+#define SOCK_IPV4_EP_ANY        { .family = AF_INET, \
+                                  .netif = SOCK_ADDR_ANY_NETIF }
+
+#if defined(SOCK_HAS_IPV6) || defined(DOXYGEN)
+/**
+ * @brief   Address to bind to any IPv6 address
+ */
+#define SOCK_IPV6_EP_ANY        { .family = AF_INET6, \
+                                  .netif = SOCK_ADDR_ANY_NETIF }
+#endif
+
+/**
+ * @brief   Abstract IP end point and end point for a raw IP sock object
+ */
+typedef struct {
+    /**
+     * @brief family of sock_ip_ep_t::addr
+     *
+     * @see @ref net_af
+     */
+    int family;
+
+    union {
+#if defined(SOCK_HAS_IPV6) || defined(DOXYGEN)
+        /**
+         * @brief IPv6 address mode
+         *
+         * @note only available if @ref SOCK_HAS_IPV6 is defined.
+         */
+        uint8_t ipv6[16];
+#endif
+        uint32_t ipv4;      /**< IPv4 address mode */
+    } addr;                 /**< address */
+
+    /**
+     * @brief   stack-specific network interface ID
+     *
+     * @todo    port to common network interface identifiers in PR #5511.
+     *
+     * Use @ref SOCK_ADDR_ANY_NETIF for any interface.
+     * For reception this is the local interface the message came over,
+     * for transmission, this is the local interface the message should be send
+     * over
+     */
+    uint16_t netif;
+} sock_ip_ep_t;
+
+/**
+ * @brief   Common IP-based transport layer end point
+ */
+struct _sock_tl_ep {
+    /**
+     * @brief family of sock_ip_ep_t::addr
+     *
+     * @see @ref net_af
+     */
+    int family;
+
+    union {
+#if defined(SOCK_HAS_IPV6) || defined(DOXYGEN)
+        /**
+         * @brief IPv6 address mode
+         *
+         * @note only available if @ref SOCK_HAS_IPV6 is defined.
+         */
+        uint8_t ipv6[16];
+#endif
+        uint32_t ipv4;      /**< IPv4 address mode */
+    } addr;                 /**< address */
+
+    /**
+     * @brief   stack-specific network interface ID
+     *
+     * @todo    port to common network interface identifiers in PR #5511.
+     *
+     * Use @ref SOCK_ADDR_ANY_NETIF for any interface.
+     * For reception this is the local interface the message came over,
+     * for transmission, this is the local interface the message should be send
+     * over
+     */
+    uint16_t netif;
+    uint16_t port;          /**< transport layer port */
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_SOCK_H_ */
+/** @} */