#ifndef __ICMP_H_
#define __ICMP_H_

#include "mos_api.h"
/*----------------------------------------------------------------------------*/
struct icmphdr {
    uint8_t  icmp_type;
    uint8_t  icmp_code;
    uint16_t icmp_checksum;
    union {
        struct {
            uint16_t icmp_id;
            uint16_t icmp_sequence;
        } echo;                     // ECHO | ECHOREPLY
        struct {
            uint16_t unused;
            uint16_t nhop_mtu;
        } dest;                     // DEST_UNREACH
    } un;
};
/*----------------------------------------------------------------------------*/
/* getters and setters for ICMP fields */
#define ICMP_ECHO_GET_ID(icmph)          (icmph->un.echo.icmp_id)
#define ICMP_ECHO_GET_SEQ(icmph)         (icmph->un.echo.icmp_sequence)
#define ICMP_DEST_UNREACH_GET_MTU(icmph) (icmph->un.dest.nhop_mtu)

#define ICMP_ECHO_SET_ID(icmph, id)      (icmph->un.echo.icmp_id = id)
#define ICMP_ECHO_SET_SEQ(icmph, seq)    (icmph->un.echo.icmp_sequence = seq)
/*----------------------------------------------------------------------------*/
void
RequestICMP(mtcp_manager_t mtcp, struct pkt_ctx *pctx, uint32_t saddr, uint32_t daddr,
        uint16_t icmp_id, uint16_t icmp_seq,
        uint8_t *icmpd, uint16_t len);

int 
ProcessICMPPacket(mtcp_manager_t mtcp, struct pkt_ctx *pctx);

/* ICMP types */
#define ICMP_ECHOREPLY      		0   /* Echo Reply               */
#define ICMP_DEST_UNREACH   		3   /* Destination Unreachable  */
#define ICMP_SOURCE_QUENCH  		4   /* Source Quench            */
#define ICMP_REDIRECT       		5   /* Redirect (change route)  */
#define ICMP_ECHO           		8   /* Echo Request             */
#define ICMP_TIME_EXCEEDED  		11  /* Time Exceeded            */
#define ICMP_PARAMETERPROB  		12  /* Parameter Problem        */
#define ICMP_TIMESTAMP      		13  /* Timestamp Request        */
#define ICMP_TIMESTAMPREPLY 		14  /* Timestamp Reply          */
#define ICMP_INFO_REQUEST   		15  /* Information Request      */
#define ICMP_INFO_REPLY     		16  /* Information Reply        */
#define ICMP_ADDRESS        		17  /* Address Mask Request     */
#define ICMP_ADDRESSREPLY   		18  /* Address Mask Reply       */
/*----------------------------------------------------------------------------*/
#endif /* __ICMP_H_ */