usr/src/sys/netns/sp.h

/*
 * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 *      @(#)sp.h        7.2 (Berkeley) %G%
 */

/*
 * Definitions for Xerox NS style sequenced packet protocol
 */

struct sphdr {
        u_char  sp_cc;          /* connection control */
        u_char  sp_dt;          /* datastream type */
#define SP_SP   0x80            /* system packet */
#define SP_SA   0x40            /* send acknowledgement */
#define SP_OB   0x20            /* attention (out of band data) */
#define SP_EM   0x10            /* end of message */
        u_short sp_sid;         /* source connection identifier */
        u_short sp_did;         /* destination connection identifier */
        u_short sp_seq;         /* sequence number */
        u_short sp_ack;         /* acknowledge number */
        u_short sp_alo;         /* allocation number */
};