Start defining layer2 structures

impl/src/layer2/layer2_structs.h

@@ -0,0 +1,43 @@
+#ifndef LAYER2_STRUCTS_H
+#define LAYER2_STRUCTS_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* Common Link-layer Header */
+
+typedef enum {
+	L2_MSG_TYPE_DATA           = 0x0,
+	L2_MSG_TYPE_CONN_MGMT      = 0x1,
+	L2_MSG_TYPE_CONNECTIONLESS = 0x4
+} layer2_message_type_t;
+
+typedef struct layer2_packet_header_s {
+	layer2_message_type_t msg_type; //!< message type
+	bool tx_request;                //!< transmission request (marks the end of the burst)
+	uint8_t src_addr_len;           //!< source address length (in 16-bit words)
+	uint8_t dst_addr_len;           //!< destination address length (in 16-bit words)
+
+	uint8_t tx_seq_nr;              //!< sequence number of this packet
+	uint8_t rx_seq_nr;              //!< sequence number expected next from he other side
+
+	uint8_t src_addr[8];            //!< source HAM-64 address
+	uint8_t dst_addr[8];            //!< destination HAM-64 address
+} layer2_packet_header_t;
+
+/* Data Packet Structs */
+
+typedef enum {
+	L2_PAYLOAD_TYPE_IPV4 = 0x00,
+	L2_PAYLOAD_TYPE_IPV6 = 0x01
+} layer2_payload_type_t;
+
+typedef struct layer2_data_header_s {
+	layer2_payload_type_t payload_type; //!< Type of the contained layer 3 packet
+} layer2_data_header_t;
+
+/* Connection Management Structs */
+
+// TODO
+
+#endif // LAYER2_STRUCTS_H