#


#define	ERR	-1
#define	TRUE	1
#define	FALSE	0

struct que {
	int	*q_head;
	int	*q_tail;
	short	q_cnt;
	};


/* Net inode */
struct netino {
	char		nt_inode[14];	/* System inode space */
/* Not to exceed 18 chars */
	char		nt_flags;
	char		nt_dev;		/* Device address - 
					   offset into config table */
	char		nt_rte;		/* First hop local dest */
	char		nt_prot;	/* Internet protocol id */
union {	struct in_name	nt_inhost;	/* Foreign host */
	short		nt_shost[2];
	long		nt_lhost;
	} nt_fhost;
	short		nt_fskt;	/* Foreign socket */
	short		nt_lskt;	/* Local socket */
	struct proc	*nt_procp;	/* Process table ptr */
	struct netino	*nt_forw;	/* Next net inode */
	struct netino	*nt_back;
	};
	
/* Netino flags */
#define	NINTRUP		01	/* Send SIGNINT to process when packet read */
#define NINTMISS	02	/* Pkt read when no process had SIGNINT
				enabled (i.e when NINTRUP not set) */

#define	SIGNINT	SIGAIO	


/* User net definition for open call */
struct netdf {
	short		n_prot1;	/* Internet id */
	short		n_prot2;	/* Internet pkt protoc id */
	short		n_sfhost[2];	/* Foreign host name */
	short		n_fskt;		/* Foreign socket */
	short		n_lskt;		/* Local socket */
	};


/* Host gate table structure */
struct gt_host {
	long	gt_fhost;
	int	gt_gate;
	};

/* Xmit packet header info */
struct pkt {
	struct net_hdr	pk_net;
	struct inet_hdr	pk_inet;
	char		pk_inopt[IPOPTSZ];
	};


/* Receive packet memory management */
struct rcvpktdir {
	short		rd_flags;
	char		*rd_begin;	/* Begin addr of rcv pkt memory */
	char		*rd_end;	/* End addr of rcv pkt memory */
	struct rcvpkt	*rd_head;	/* Head of pkt queue in rcv memory */
	struct rcvpkt	*rd_tail;	/* End of pkt queue in rcv memory */
	struct rcvpkt	*rd_rcvenb;	/* Loc. into which rcv is enabled */
	};

/* Receive packet structure */
struct rcvpkt {
	struct rcvpkt	*rp_forw;	/* Next rcv pkt */
	struct rcvpkt	*rp_back;	/* Previous rcv pkt */
	short		rp_flags;
	short		rp_len;		/* No. bytes in packet */
	struct netino	*rp_inode;	/* Net inode to which pkt belongs */
	struct net_hdr	rp_net;		/* Local net header */
	struct inet_hdr	rp_inet;	/* Inet header */
	char		rp_data[IPDATASZ];
	};

#define RCVPKTSZ	sizeof(struct rcvpkt)
#define	NETBYTES	(NETHSIZ + IPHSIZ + IPDATASZ)
#define	RCVPKTHDSZ	(RCVPKTSZ - NETBYTES)


/* Rcvpkt flags */
#define N_LOCK		01	/* Pkt being copied into user buffer, */
				/*	do not drop it */
#define N_WANTED	02	/* Pkt space wh. is locked is needed
					for rcv space */
#define N_FFRAG		04	/* Pkt incomplete, reassembly being done 
					into this pkt */
#define	N_FRAG		010	/* Pkt is non-first fragment, it
					is waiting for its sibling first
					fragment into which it will be
					copied */


/* Rcv packet error codes */
#define	ENETLEN		1	/* Weird packet length from net */
#define	ENETPROT	2	/* Bad protocol id form net */
#define	EIPHLEN		3	/* Bad inet header length */
#define	EIPLEN		4	/* Bad inet packet length */
#define	EIPCKSUM	5	/* Bad inet chksum */
#define	EIPDEST		6	/* Inet packet not dest. for mymach */
#define	EIPFRAG		7	/* Inet fragment */
#define	EIPMATCH	8	/* No net connection found for rcv. pkt */
#define DROPP		9	/* Packet dropped from rcv pkt memory
				   because need space to enable new rcv */
#define	PROGERR		10	/* Program error */
#define	MAXNERR		PROGERR


extern short		netdev;

extern long		mymach;

extern struct que	neti_que;

extern struct rcvpktdir	rcvpktdir;