#ifndef	_ICMP_H
#define	_ICMP_H

#ifndef	_GLOBAL_H
#include "global.h"
#endif

#ifndef	_MBUF_H
#include "mbuf.h"
#endif

#ifndef	_IFACE_H
#include "iface.h"
#endif

#ifndef	_INTERNET_H
#include "internet.h"
#endif

#ifndef _IP_H
#include "ip.h"
#endif

/* SNMP MIB variables, used for statistics and control. See RFC 1066 */
extern struct mib_entry Icmp_mib[];
#define	icmpInMsgs		Icmp_mib[1].value.integer
#define	icmpInErrors		Icmp_mib[2].value.integer
#define icmpInDestUnreachs	Icmp_mib[3].value.integer
#define icmpInTimeExcds		Icmp_mib[4].value.integer
#define icmpInParmProbs		Icmp_mib[5].value.integer
#define icmpInSrcQuenchs	Icmp_mib[6].value.integer
#define icmpInRedirects		Icmp_mib[7].value.integer
#define icmpInEchos		Icmp_mib[8].value.integer
#define icmpInEchoReps		Icmp_mib[9].value.integer
#define icmpInTimestamps	Icmp_mib[10].value.integer
#define icmpInTimestampReps	Icmp_mib[11].value.integer
#define icmpInAddrMasks		Icmp_mib[12].value.integer
#define icmpInAddrMaskReps	Icmp_mib[13].value.integer
#define icmpOutMsgs		Icmp_mib[14].value.integer
#define icmpOutErrors		Icmp_mib[15].value.integer
#define icmpOutDestUnreachs	Icmp_mib[16].value.integer
#define icmpOutTimeExcds	Icmp_mib[17].value.integer
#define icmpOutParmProbs	Icmp_mib[18].value.integer
#define icmpOutSrcQuenchs	Icmp_mib[19].value.integer
#define icmpOutRedirects	Icmp_mib[20].value.integer
#define icmpOutEchos		Icmp_mib[21].value.integer
#define icmpOutEchoReps		Icmp_mib[22].value.integer
#define icmpOutTimestamps	Icmp_mib[23].value.integer
#define icmpOutTimestampReps	Icmp_mib[24].value.integer
#define icmpOutAddrMasks	Icmp_mib[25].value.integer
#define icmpOutAddrMaskReps	Icmp_mib[26].value.integer
#define	NUMICMPMIB	26

/* Internet Control Message Protocol */

/* Message types */
#define	ICMP_ECHO_REPLY		0	/* Echo Reply */
#define	ICMP_DEST_UNREACH	3	/* Destination Unreachable */
#define	ICMP_QUENCH		4	/* Source Quench */
#define	ICMP_REDIRECT		5	/* Redirect */
#define	ICMP_ECHO		8	/* Echo Request */
#define	ICMP_TIME_EXCEED	11	/* Time-to-live Exceeded */
#define	ICMP_PARAM_PROB		12	/* Parameter Problem */
#define	ICMP_TIMESTAMP		13	/* Timestamp */
#define	ICMP_TIME_REPLY		14	/* Timestamp Reply */
#define	ICMP_INFO_RQST		15	/* Information Request */
#define	ICMP_INFO_REPLY		16	/* Information Reply */
#define	ICMP_ADDR_MASK		17	/* Address mask request */
#define	ICMP_ADDR_MASK_REPLY	18	/* Address mask reply */
#define	ICMP_IPSP		19	/* Problem with secured packet */
#define	ICMP_TYPES		20

/* Internal format of an ICMP header (checksum is missing) */
struct icmp {
	uint8 type;
	uint8 code;
 	union icmp_args {
		uint16 mtu;
		int32 unused;
		uint8 pointer;
		int32 address;
		struct {
			uint16 id;
			uint16 seq;
		} echo;
	} args;
};
#define	ICMPLEN		8	/* Length of ICMP header on the net */
	
/* Destination Unreachable codes */
#define	ICMP_NET_UNREACH	0	/* Net unreachable */
#define	ICMP_HOST_UNREACH	1	/* Host unreachable */
#define	ICMP_PROT_UNREACH	2	/* Protocol unreachable */
#define	ICMP_PORT_UNREACH	3	/* Port unreachable */
#define	ICMP_FRAG_NEEDED	4	/* Fragmentation needed and DF set */
#define	ICMP_ROUTE_FAIL		5	/* Source route failed */
#define ICMP_ADMIN_PROHIB       13      /* Administrativly prohibbited */

#define NUNREACH	14

/* Time Exceeded codes */
#define	ICMP_TTL_EXCEED		0	/* Time-to-live exceeded */
#define	ICMP_FRAG_EXCEED	1	/* Fragment reassembly time exceeded */

#define	NEXCEED		2

/* Redirect message codes */
#define	ICMP_REDR_NET	0	/* Redirect for the network */
#define	ICMP_REDR_HOST	1	/* Redirect for the host */
#define	ICMP_REDR_TOS	2	/* Redirect for Type of Service, or-ed with prev */

#define	NREDIRECT	3

/* Bad security packet codes */
#define	ICMP_IPSP_SPI_UNKNOWN	0
#define	ICMP_IPSP_AUTH_FAIL	1
#define	ICMP_IPSP_DECRYPT_FAIL	2
#define	NIPSP			3

extern int Icmp_trace;
extern int Icmp_echo;

/* ICMP messages, decoded */
extern char *Icmptypes[],*Unreach[],*Exceed[],*Redirect[],*Said_icmp[];

struct icmplink {
	uint8 proto;
	void (*funct)(int32,int32,int32,uint8,uint8,struct mbuf **);
};
extern struct icmplink Icmplink[];

/* In icmp.c: */
void icmp_input(struct iface *iface,struct ip *ip,struct mbuf **bp,
	int rxbroadcast,int32 said);
int icmp_output(struct ip *ip,struct mbuf *data,uint8 type,uint8 code,
	union icmp_args *args);

/* In icmphdr.c: */
void htonicmp(struct icmp *icmp,struct mbuf **data);
int ntohicmp(struct icmp *icmp,struct mbuf **bpp);

#endif	/* _ICMP_H */