net: added generic link layer header format

sys/include/net/ng_llhdr.h

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2015 Freie Universität Berlin
+ *
+ * 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.
+ */
+
+/**
+ * @ingroup     net
+ * @{
+ *
+ * @file
+ * @brief       Generic link layer header
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ */
+
+#ifndef LLHDR_H_
+#define LLHDR_H_
+
+#include <string.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Generic link layer header
+ *
+ * The actual addresses are put into the memory following this datastructure.
+ */
+typedef struct __attribute__((packed)) {
+    uint8_t addr_len;           /**< link layer address length in byte */
+    uint8_t rssi;               /**< rssi of received packet (optional) */
+    uint8_t lqi;                /**< lqi of received packet (optional) */
+    uint8_t options;            /**< any optional options */
+} llhdr_t;
+
+/**
+ * @brief   Initialize the given generic link layer header
+ *
+ * @param[in] hdr           header to initialize
+ * @param[in]  addr_len     link layer address length
+ */
+inline void llhdr_init(llhdr_t *hdr, uint8_t addr_len)
+{
+    hdr->addr_len = addr_len;
+    hdr->rssi = 0;
+    hdr->lqi = 0;
+}
+
+/**
+ * @brief   Get the size of the given generic link layer header
+ *
+ * @param[in] hdr           header to get the size of
+ *
+ * @return                  the size of the given header
+ */
+inline size_t llhdr_sizeof(llhdr_t *hdr)
+{
+    return sizeof(llhdr_t) + hdr->addr_len + hdr->addr_len;
+}
+
+/**
+ * @brief   Get the source address from the given header
+ *
+ * @param[in] hdr           header to read from
+ * @param[in] addr          buffer to write to
+ * @param[in] addr_len      maximum number of bytes to read
+ */
+inline void llhdr_get_src_addr(llhdr_t *hdr, uint8_t *addr, uint8_t addr_len)
+{
+    memcpy(addr, (hdr + sizeof(llhdr_t)), hdr->addr_len);
+}
+
+/**
+ * @brief   Set the source address in the given header
+ *
+ * @param[in] hdr           header to write to
+ * @param[in] addr          new source address
+ * @param[in] addr_len      *addr* length
+ */
+inline void llhdr_set_src_addr(llhdr_t *hdr, uint8_t *addr, uint8_t addr_len)
+{
+    memcpy((hdr + sizeof(llhdr_t)), addr, addr_len);
+}
+
+
+/**
+ * @brief   Get the destination address from the given header
+ *
+ * @param[in] hdr           header to read from
+ * @param[in] addr          buffer to write to
+ * @param[in] addr_len      maximum number of bytes to read
+ */
+inline void llhdr_get_dst_addr(llhdr_t *hdr, uint8_t *addr, uint8_t addr_len)
+{
+    memcpy(addr, (hdr + sizeof(llhdr_t) + hdr->addr_len), hdr->addr_len);
+}
+
+/**
+ * @brief   Set the destination address in the given header
+ *
+ * @param[in] hdr           header to write to
+ * @param[in] addr          new destination address
+ * @param[in] addr_len      *addr* length
+ */
+inline void llhdr_set_dst_addr(llhdr_t *hdr, uint8_t *addr, uint8_t addr_len)
+{
+    memcpy((hdr + sizeof(llhdr_t) + hdr->addr_len), addr, addr_len);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LL_GEN_FRAME_H_ */
+/** @} */