*** ../../vanilla3.0/tcp.h	Tue Apr 28 10:28:03 1998
--- tcp.h	Tue Sep 15 15:58:39 1998
***************
*** 1,7 ****
  /*	BSDI tcp.h,v 2.11 1996/10/11 16:01:49 pjd Exp	*/
  
  /*
!  * Copyright (c) 1982, 1986, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
--- 1,7 ----
  /*	BSDI tcp.h,v 2.11 1996/10/11 16:01:49 pjd Exp	*/
  
  /*
!  * Copyright (c) 1982, 1986, 1993, 1998
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
***************
*** 77,88 ****
--- 77,111 ----
  #define TCPOPT_SACK_PERMITTED	4		/* Experimental */
  #define    TCPOLEN_SACK_PERMITTED	2
  #define TCPOPT_SACK		5		/* Experimental */
+ #define TCPOLEN_SACK		8 /* 2*sizeof(tcp_seq): len of a sack block */
  #define TCPOPT_TIMESTAMP	8
  #define    TCPOLEN_TIMESTAMP		10
  #define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
  
  #define TCPOPT_TSTAMP_HDR	\
      (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
+ 
+ #ifdef SACK
+ /* Option definitions */
+ #define TCPOPT_SACK_PERMIT_HDR \
+ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
+ #define TCPOPT_SACK_HDR   (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)
+ /* User-settable options */ 
+ #define TCP_SACK_DISABLE  0x300 /* disable SACKs(if enabled by deflt.)*/
+ #define TCP_DO_SACK       0x301 /* enable SACKs(if disabled by deflt.)*/
+ /* Miscellaneous constants */
+ #define MAX_SACK_BLKS     6	/* Max # SACK blocks stored at sender side */
+ #define TCP_MAX_SACK      3	/* Max # SACKs sent in any segment */
+ #endif /* SACK */
+ 
+ #if defined(SACK) || defined(NEWRENO)
+ #define TCP_MAXBURST  4
+ #endif
+ 
+ #ifndef NTOHL
+ #define NTOHL(d) ((d) = ntohl((d)))
+ #endif
+ 
  
  /*
   * Default maximum segment size for TCP.