*** ../../vanilla3.0/tcp_usrreq.c	Tue Apr 28 10:28:02 1998
--- tcp_usrreq.c	Tue Sep 15 15:59:34 1998
***************
*** 12,18 ****
   */
  
  /*
!  * Copyright (c) 1982, 1986, 1988, 1993, 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, 1988, 1993, 1995, 1998
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
***************
*** 78,83 ****
--- 78,86 ----
   */
  extern	char *tcpstates[];
  
+ #ifdef SACK
+ extern int tcp_do_sack;
+ #endif
  /*
   * Process a TCP user request for TCP tb.  If this is a send request
   * then m is the mbuf chain of send data.  If this is a timer expiration
***************
*** 224,229 ****
--- 227,240 ----
  		tp->t_timer[TCPT_KEEP] = tcp_conntimeo;
  		tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/4;
  		tcp_sendseqinit(tp);
+ #if defined(SACK) || defined (NEWRENO)
+ 		tp->snd_recover = tp->snd_una;
+ #endif
+ #if defined(SACK) && defined(FACK)
+ 		tp->snd_fack = tp->snd_una;
+ 		tp->retran_data = 0;
+ 		tp->snd_awnd = 0;
+ #endif
  		error = tcp_output(tp);
  		break;
  
***************
*** 422,427 ****
--- 433,449 ----
  			else
  				tp->t_flags &= ~TF_STDURG;
  			break;
+ #ifdef SACK
+ 		case TCP_SACK_DISABLE:
+ 			i = *mtod(m, int *);
+ 			tp->sack_disable = i;
+ 			break;
+ 
+ 		case TCP_DO_SACK:
+ 			i = *mtod(m, int *);
+ 			tcp_do_sack = i;
+ 			break;
+ #endif
  
  		default:
  			error = ENOPROTOOPT;
***************
*** 445,450 ****
--- 467,481 ----
  		case TCP_STDURG:
  			*mtod(m, int *) = tp->t_flags & TF_STDURG;
  			break;
+ #ifdef SACK
+ 		case TCP_SACK_DISABLE:
+ 			*mtod(m, int *) = tp->sack_disable;
+ 			break;
+ 
+ 		case TCP_DO_SACK:
+ 			*mtod(m, int *) = tcp_do_sack;
+ 			break;
+ #endif
  		default:
  			error = ENOPROTOOPT;
  			break;