/* icmp.h */

/* EMACS_MODES: c !fill */

/* This file contains all the definitions for icmp and ggp packets.
 * It depends on the standard data type definitions from types.h,
 * and also on the internet packet header definitions in ip.h.
 */


struct	idseq	{			/* echo/timestamp identifier */
	unshort	id_ident;		/* identifier */
	unshort	id_seq;			/* sequence no. */
};


struct	tmstmp	{			/* timestamp */
	long	tm_orig;		/* originate timestamp */
	long	tm_recv;		/* receive timestamp */
	long	tm_trans;		/* transmit timestamp */
};


struct	th	{			/* tcp/ip hdr. for conn. id */
	struct	ip	th_ip;		/* ip hdr */
	char	th_data[8];		/* 64 bits of message */
};


struct	icmp	{			/* an icmp data packet */
	char	ic_type;		/* icmp message type */
	char	ic_code;		/* message subtype */
	unshort	ic_sum;			/* checksum */
	union	{
		char	ic_off;		/* parameter error offset */
		struct	in_name	ic_gaddr; /* redirect gateway addr */
		struct	idseq	ic_iseq; /* echo/timestamp id */
	} ic_misc;
	union	{
		struct	th	ic_hdr;	/* tcp/ip header of orig. d'gram */
		struct	tmstmp	ic_time; /* timestamp */
		char	ic_dum[1];	/* echo packet data */
	} ic_data;
};


struct	ggredir	{			/* ggp redirect structure */
	struct	in_name	gr_addr;	/* redirect gateway addr */
	struct	th	gr_hdr;		/* tcp/ip hdr of orig. d'gram */
};


struct	ggp	{			/* a ggp packet */
	char	gg_type;		/* ggp type */
	char	gg_code;		/* ggp subtype */
	unshort	gg_seq;			/* ggp sequence no */
	union	{
		struct	ggredir	gg_redir; /* redirect packet data */
		struct	th	gg_hdr;	/* tcp/ip hdr of orig. d'gram */
		char	gg_dum[1];	/* echo data */
	} gg_data;
};


/* ICMP field definitions */

#define	ICMPROTO	1		/* icmp ip protocol */

#define	IC_ERPLY	0		/* echo reply type */

#define	IC_DUR		3		/* destination unreachable type */
#define	IC_DU_NUR	0		/* net unreachable subtype */
#define	IC_DU_HUR	1		/* host unreachable subtype */
#define	IC_DU_PRUR	2		/* protocol unreachable subtype */
#define	IC_DU_POUR	3		/* port unreachable subtype */
#define	IC_DU_FRAG	4		/* needed fragmentation */
#define	IC_DU_SRC	5		/* source route failed */

#define	IC_SRQ		4		/* source quench type */

#define	IC_REDIR	5		/* redirect packet type */
#define	IC_RD_NET	0		/* redirect packets for net */
#define	IC_RD_HOST	1		/* redirect packets for host */
#define	IC_RD_TSN	2		/* redirect packets for TOS & net */
#define	IC_RC_TSH	3		/* redirect packets for TOS & host */

#define	IC_ECHO		8		/* echo type */

#define	IC_TIME		11		/* time exceeded type */
#define	IC_TE_TTL	0		/* time to live exceeded */
#define	IC_TE_FRAG	1		/* fragment reassembly time exceeded */

#define	IC_PARAM	12		/* parameter problem type */

#define	IC_TMSTMP	13		/* timestamp type */

#define	IC_TMRPLY	14		/* timestamp reply type */

#define	IC_IRQ		15		/* info request type */

#define	IC_IRPLY	16		/* info reply type */


/* GGP field definitions */

#define	GGPROTO		3		/* ggp protocol no. */

#define	GG_ERPLY	0		/* echo reply packet */
#define	GG_DUR		3		/* dest. unreachable */
#define	GG_SRQ		4		/* source quench */
#define	GG_REDIR	5		/* redirect */
#define	GG_ECHO		8		/* echo packet */

/* Useful macros */

#define	tvec_to_ut(tv)	((long)((((*(long *)(&tv[0])) % 86400L) * 1000L) \
+ ((tv)[2] * (1000L / 60L)))) /* convert time to ms. UT */