/* 6LoWPAN IP header file */

#ifndef SIXLOWIP_H
#define SIXLOWIP_H

#include <stdint.h>

#define MSBA2_SENSOR_NODE 1

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

/* IPv6 field values */ 
#define IPV6_VER                    0x60
#define ICMPV6_NXT_HDR              0x3A
#define ND_HOPLIMIT                 0xFF

#define SIXLOWPAN_IPV6_LL_ADDR_LEN  8            

/* size of global buffer */
#define BUFFER_SIZE (LL_HDR_LEN + MTU)

#define MSBA2_OUI                   0x005BA2    // 24bit OUI 
#define R8BIT                       0xA2        // random 8bit

#ifdef MSBA2_SENSOR_NODE
#define OUI                         0x005BA2
#else
#define OUI                         0x0
#endif

#define RADIO_CONF                  radio_cc1100
#define RADIO                       RADIO_CONF

#define MULTIHOP_HOPLIMIT           64

extern uint8_t ipv6_ext_hdr_len;

/* base header lengths */
#ifdef MSBA2_SENSOR_NODE
    #define LL_HDR_LEN              0x4
#else
    #define LL_HDR_LEN              0x0    
#endif /* MSBA2_SENSOR_NODE */
#define ICMPV6_HDR_LEN              0x4
#define IPV6_HDR_LEN                0x28 
#define LLHDR_IPV6HDR_LEN (LL_HDR_LEN + IPV6_HDR_LEN + ipv6_ext_hdr_len)
#define LLHDR_ICMPV6HDR_LEN (LL_HDR_LEN + IPV6_HDR_LEN + ipv6_ext_hdr_len + ICMPV6_HDR_LEN)
#define IPV6HDR_ICMPV6HDR_LEN (IPV6_HDR_LEN + ipv6_ext_hdr_len + ICMPV6_HDR_LEN)

/* global buffer*/
uint8_t buffer[BUFFER_SIZE];
/* packet length*/
extern uint16_t packet_length;

/* 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;
};

typedef struct link_layer_addr{
    uint8_t uint8[8];  
} link_layer_addr;

#define HTONS(a) (uint16_t)((((uint16_t) (a)) << 8) | (((uint16_t) (a)) >> 8))
#define HTONL(a) ((((uint32_t) (a) & 0xff000000) >> 24) | \
                  (((uint32_t) (a) & 0x00ff0000) >> 8)  | \
                  (((uint32_t) (a) & 0x0000ff00) << 8)  | \
                  (((uint32_t) (a) & 0x000000ff) << 24)) 

/* function prototypes */
void create_link_local_prefix(ipv6_addr *ipaddr);
void create_all_routers_mcast_addr(ipv6_addr *ipaddr);
void set_eui64(ipv6_addr *ipaddr);
link_layer_addr* get_eui(ipv6_addr *ipaddr);
void bootstrapping(void);
void print6addr(ipv6_addr *ipaddr);

#endif /* SIXLOWIP_H*/