#

/* VII net header */
struct net_hdr {
	char	v2_dest;	/* V2 net dest. addr. */
	char	v2_src;		/* V2 net src addr. */
	char	v2_prot1;	/* MIT protocol hdr word (MPHW) */
	char	v2_prot2;	/* Subfield for MPHW */
	short	v2_zero;	/* Padding */
	};

#define	NETHSIZ		sizeof(struct net_hdr)
#define NETMAX		2046

#define MPHWPROT	2	/* MIT protocol hdr word (MPHW) */
#define	INETPROT	1	/* internet protocol id for MPHW type hdr */


/* Internet name */
struct in_name {
	char	in_net;		/* Net */
	char	in_snet;	/* Subnet */
	char	in_rsvd;	
	char	in_host;	/* Host */
	};

/* Internet header */
struct inet_hdr	{
	char		ip_ihlver;	/* Inet hdr length in 32 bit words */
					/* Header version */
	char		ip_tsrv;	/* Type of service */
	short		ip_len;		/* Total packet length inc. header */
	short		ip_id;		/* Id to help in fragmentation */
	short		ip_foff : 13;	/* Fragment offset */
	short		ip_flgs : 3;	/* Flags */
	char		ip_time;	/* Packet time to live in secs */
	char		ip_prot;	/* Protocol number */
	short		ip_chksum;	/* Inet hdr chksum */
	long		ip_src;		/* Source name */
	long		ip_dest;	/* Dest. name */
	};

#define	IPHSIZ		sizeof(struct inet_hdr)
#define	MAXINET		576		/* Standard max. inet pkt size */
#define IPDATASZ	566		/* MAXINET - IPHSIZ + 10 pad bytes 
						must keep pad bytes for
						reassembly and for net
						padding */
#define IPOPTSZ		40		/* Internet hdr - option max len */

#define	MOREFRAGS	01		/* More fragments - inet flag */

#define	TCPPROT		6		/* Internet TCP protocol */
#define	DGPROT		17		/* Internet datagram protocol */
#define GWPROT		3		/* Internet gateway to gateway prot */


/* TCP Header */
struct tcp_hdr {
	short	tcp_sskt;	/* Source socket */
	short	tcp_dskt;	/* Destination socket */
	short	tcp_seqno;	/* Sequence no. */
	short	tcp_ackno;	/* Acknowledgement no. */
	short	tcp_flags : 6;	/* Fin/Syn/Rst/Eol/Ack/Urg */
	short	tcp_rsvd : 6;	/* Reserved */
	short	tcp_off : 4;	/* Offset to data */
	short	tcp_window;	/* Window size */
	short	tcp_cksum;	/* Chksum */
	short	tcp_urgp;	/* Urgent pointer */
	};

/* User Datagram Header */
struct dgm_hdr {
	short	dg_sskt;	/* Source socket */
	short	dg_dskt;	/* Destination socket */
	short	dg_len;		/* Length */
	short	dg_cksum;	/* Chksum */
	};

#define	DGICP		69	/* ICP socket no. for tftp */