/******************************************************
*		SR_ICMP.H
*	Package for handling ICMP Protocols
*  
*******************************************************/

#ifndef SR_ICMP_H
#define SR_ICMP_H

/*
*	Author: Denny Chen Dai
*	Construction of ICMP Packet Data from scracth
*
*	len:     totol lenth of packet data created
*	dhost[]: destination MAC address
*	shost[]: src MAC address
*	dest_ip: dest ip
*	src_ip:  src_ip 
*	icmp_type: ICMP protocol type
*	icmp_code: ICMP protocol type code
*	ip_hdr: pointer to ip protocol header address
*/
uint8_t *sr_construct_ICMP(unsigned int *, unsigned char [ETHER_ADDR_LEN], unsigned char [ETHER_ADDR_LEN],
	uint32_t, uint32_t,	uint8_t, uint8_t, struct ip *);

/*
*	Author: Denny Chen Dai	
*	ICMP Protocol Handling Function
* 
*	v1. Handling ICMP ECHO_REQUEST
*
*/
void sr_handle_ICMP(struct sr_instance*, uint8_t *, unsigned int, char*, 
	struct ip *, struct sr_ethernet_hdr *);

/*
*	Author: Nicholas, Denny
*	Display ICMP packet content
*
*	base: pointer to the starting addr of ICMP packet
*/
void display_ICMP(uint8_t *base);


#endif