/**
 * 6lowpan border router multiplexer
 *
 * Copyright (C) 2013  INRIA.
 *
 * This file subject to the terms and conditions of the GNU Lesser General
 * Public License. See the file LICENSE in the top level directory for more
 * details.
 *
 * @ingroup sixlowpan
 * @{
 * @file    bordermultiplex.h
 * @brief   data structs for border router multiplexing
 * @author  Martin Lenders <mlenders@inf.fu-berlin.de>
 * @author  Oliver Hahm <oliver.hahm@inria.fr>
 * @}
 */

#ifndef _SIXLOWPAN_BORDERMULTIPLEX_H
#define _SIXLOWPAN_BORDERMULTIPLEX_H

#include <stdint.h>
#include <stdlib.h>

#include "ip.h"

/* packet types of uart-packets */
#define BORDER_PACKET_RAW_TYPE    (0)
#define BORDER_PACKET_CONF_TYPE   (2)
#define BORDER_PACKET_L3_TYPE     (3)

/* configuration types */
#define BORDER_CONF_CONTEXT       (2)
#define BORDER_CONF_IPADDR        (3)

/* ethertypes for L3 packets */
#define BORDER_ETHERTYPE_IPV6     (0x86DD)

typedef struct __attribute__((packed)) {
    uint8_t empty;
    uint8_t type;
    uint8_t seq_num;
} border_packet_t;

typedef struct __attribute__((packed)) {
    uint8_t empty;
    uint8_t type;
    uint8_t seq_num;
    uint16_t ethertype;
} border_l3_header_t;

typedef struct __attribute__((packed)) {
    uint8_t empty;
    uint8_t type;
    uint8_t seq_num;
    uint8_t conftype;
} border_conf_header_t;

typedef struct __attribute__((packed)) {
    uint8_t empty;
    uint8_t type;
    uint8_t seq_num;
    uint8_t conftype;
    uint16_t version;
    ipv6_addr_t addr;
} border_addr_packet_t;

typedef struct __attribute__((packed)) {
    uint8_t empty;
    uint8_t type;
    uint8_t seq_num;
    uint8_t conftype;
    struct border_context_t {
        uint16_t version;
        uint8_t cid;
        ipv6_addr_t prefix;
        uint8_t length;
        uint8_t comp;
        uint16_t lifetime;
    } context;
} border_context_packet_t;

#define BORDER_BUFFER_SIZE (sizeof(border_l3_header_t) + IPV6_MTU)

void demultiplex(border_packet_t *packet, int len);
void multiplex_send_ipv6_over_uart(ipv6_hdr_t *packet);
void multiplex_send_addr_over_uart(ipv6_addr_t *addr);

int readpacket(uint8_t *packet_buf, size_t size);
int writepacket(uint8_t *packet_buf, size_t size);

#endif /* _SIXLOWPAN_BORDERMULTIPLEX_H*/