*** ../../vanilla3.0/tcp_var.h	Tue Apr 28 10:28:03 1998
--- tcp_var.h	Tue Sep 15 15:59:42 1998
***************
*** 12,18 ****
   */
  
  /*
!  * Copyright (c) 1982, 1986, 1993, 1994, 1995
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
--- 12,18 ----
   */
  
  /*
!  * Copyright (c) 1982, 1986, 1993, 1994, 1995, 1998
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
***************
*** 53,58 ****
--- 53,75 ----
   * Kernel variables for tcp.
   */
  
+ #ifdef SACK
+ struct sackblk
+ {   
+ 	tcp_seq start;		/* start seq no. of sack block */
+ 	tcp_seq end; 		/* end seq no. */
+ };  
+     
+ struct sackhole
+ {   
+ 	tcp_seq start;      	/* start seq no. of hole */ 
+ 	tcp_seq end;        	/* end seq no. */
+ 	int dups;      		/* number of dup(s)acks for this hole */
+ 	tcp_seq rxmit;      	/* next seq. no in hole to be retransmitted */
+ 	struct sackhole *next;  /* next in list */
+ };
+ #endif
+ 
  /*
   * Tcp control block, one per tcp; fields:
   */
***************
*** 93,103 ****
--- 110,142 ----
  	tcp_seq	snd_wl2;		/* window update seg ack number */
  	tcp_seq	iss;			/* initial send sequence number */
  	u_long	snd_wnd;		/* send window */
+ #ifdef SACK
+ 	int sack_disable;            	/* disable SACK for this connection */
+ 	int snd_numholes; 		/* number of holes seen by sender */
+ 	struct sackhole *snd_holes;     /* linked list of holes (sorted) */
+ #if defined(SACK) && defined(FACK)
+ 	tcp_seq snd_fack;		/* for FACK congestion control */
+ 	u_long	snd_awnd;		/* snd_nxt - snd_fack + */
+ 					/* retransmitted data */
+ 	int retran_data;		/* amount of outstanding retx. data  */
+ #endif /* FACK */
+ #endif /* SACK */
+ #if defined(SACK) || defined(NEWRENO)
+ 	tcp_seq snd_recover;		/* for use in fast recovery */
+ #endif
  /* receive sequence variables */
  	u_long	rcv_wnd;		/* receive window */
  	tcp_seq	rcv_nxt;		/* receive next */
  	tcp_seq	rcv_up;			/* receive urgent pointer */
  	tcp_seq	irs;			/* initial receive sequence number */
+ #ifdef SACK
+ 	tcp_seq rcv_laststart;          /* start of last segment recd. */
+ 	tcp_seq rcv_lastend;            /* end of ... */
+ 	tcp_seq rcv_lastsack;           /* last seq number(+1) sack'd by rcv'r*/
+ 	int rcv_numsacks;           	/* # distinct sack blks present */
+ 	struct sackblk sackblks[MAX_SACK_BLKS];  /* seq nos. of sack blocks */
+ #endif
+ 
  /*
   * Additional variables for this implementation.
   */
***************
*** 404,409 ****
--- 443,466 ----
  	    register struct tcpiphdr *, long, u_long));
  void	 syn_cache_timer __P((int));
  
+ #ifdef SACK
+ int      tcp_sack_option __P((struct tcpcb *,struct tcpiphdr *,u_char *,int));
+ void     tcp_update_sack_list __P((struct tcpcb *tp));
+ void     tcp_del_sackholes __P((struct tcpcb *, struct tcpiphdr *));
+ void     tcp_clean_sackreport __P((struct tcpcb *tp));
+ void     tcp_sack_adjust __P((struct tcpcb *tp));
+ struct sackhole * tcp_sack_output __P((struct tcpcb *tp));
+ int    	 tcp_sack_partialack __P((struct tcpcb *, struct tcpiphdr *));
+ #ifdef DEBUG
+ void     tcp_print_holes __P((struct tcpcb *tp));
+ #endif
+ #endif /* SACK */
+ #if defined(NEWRENO) || defined(SACK)
+ int 	 tcp_newreno __P((struct tcpcb *, struct tcpiphdr *));
  #endif
+ #if defined(SACK) || defined(NEWRENO)
+ u_long tcp_seq_subtract  __P((u_long, u_long )); 
+ #endif /* FACK */
  
+ #endif /* KERNEL */
  #endif /* !_NETINET_TCP_VAR_H_ */