/* 6LoWPAN IP header file */

#include <stdint.h>

/* set maximum transmission unit */
#ifdef MSBA2_SENSOR_NODE
#define MTU                         0x3A
#else 
#define MTU                         0x0
#endif                         

#define IPV6_VERSION                0x60
#define ICMP_NEXTHEADER             0x3A
#define NEIGHBOR_DISCOVERY_HOPLIMIT 0xFF

#define ICMP_HEADER_LENGTH          0x4
#define IPV6_HEADER_LENGTH          0x28            

/* link layer protocol control information length*/
#ifdef MSBA2_SENSOR_NODE
#define LL_HEADER_LENGTH            0x4
#else
#define LL_HEADER_LENGTH            0x0    
#endif

#define BUFFER_SIZE (LL_HEADER_LENGTH + MTU)

uint8_t ipv6_ext_hdr_len = 0;

#define LLHDR_IPV6HDR_LENGTH (LL_HEADER_LENGTH + IPV6_HEADER_LENGTH + ipv6_ext_hdr_len)

/* global buffer*/
uint8_t[BUFFER_SIZE] buffer;


/* ipv6 extension header length */

typedef union ipv6_addr{
    uint8_t uint8[16];
    uint16_t uint16[8];
} ipv6_addr;

struct icmpv6_hdr{
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
};

struct ipv6_hdr{
    uint8_t version_trafficclass;
    uint8_t trafficclass_flowlabel;
    uint16_t flowlabel;
    uint16_t length;
    uint8_t nextheader;
    uint8_t hoplimit;
    ipv6_addr srcaddr;
    ipv6_addr destaddr;
};