#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

#ifndef _SESSION_H
#include "session.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_TYPES		19

/* Internal format of an ICMP header (checksum is missing) */
struct icmp {
	char type;
	char code;
 	union icmp_args {
		int16 mtu;
		int32 unused;
		unsigned char pointer;
		int32 address;
		struct {
			int16 id;
			int16 seq;
		} echo;
	} args;
};
#define	ICMPLEN		8	/* Length of ICMP header on the net */
#define	NULLICMP	(union icmp_args *)0
	
/* 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	NUNREACH	6

/* 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

extern int Icmp_trace;

struct ping {
	struct session *sp;
	int32 target;		/* Starting target IP address */
	int incflag;		/* If true, increment target after each ping */
	int32 sent;		/* Total number of pings sent */
	int32 srtt;		/* Smoothed round trip time */
	int32 mdev;		/* Mean deviation */
	int32 responses;	/* Total number of responses */
	int32 interval;		/* Inter-ping interval, ticks */
	int16 len;		/* Length of data portion of ping */
};
/* ICMP messages, decoded */
extern char *Icmptypes[],*Unreach[],*Exceed[],*Redirect[];

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

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

/* In icmpcmd.c: */
void echo_proc __ARGS((int32 source,int32 dest,struct icmp *icmp,struct mbuf *bp));
int pingem __ARGS((int s,int32 target,int16 seq,int16 id,int16 len));

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

#endif	/* _ICMP_H */