Index: tcp_input.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/tcp_input.c,v
retrieving revision 1.128
diff -u -r1.128 tcp_input.c
--- tcp_input.c	2001/04/20 11:58:55	1.128
+++ tcp_input.c	2001/05/26 19:20:12
@@ -2758,6 +2758,21 @@
 	if ((bufsize = rt->rt_rmx.rmx_sendpipe) == 0)
 #endif
 		bufsize = so->so_snd.sb_hiwat;
+	/*
+	 * If src or dst port is listed in tcp_override_port, adjust the
+	 * socket buffers to the size's specified by tcp_override_sendspace
+	 * and tcp_override_recvspace.send.
+	 */
+	if ((tcp_override_port != 0) &&
+		((ntohs(inp->inp_lport) == tcp_override_port) ||
+		(ntohs(inp->inp_fport) == tcp_override_port))) {
+		printf("override: lport %d fport %d ntohs(lport) %d ntohs(fport) %d sendspace %d\n",
+			inp->inp_lport, inp->inp_fport, ntohs(inp->inp_lport), ntohs(inp->inp_fport),
+			tcp_override_sendspace);
+		
+		bufsize = tcp_override_sendspace;
+	}
+
 	if (bufsize < mss)
 		mss = bufsize;
 	else {
@@ -2772,6 +2787,12 @@
 	if ((bufsize = rt->rt_rmx.rmx_recvpipe) == 0)
 #endif
 		bufsize = so->so_rcv.sb_hiwat;
+
+	if ((tcp_override_port != 0) &&
+		((ntohs(inp->inp_lport) == tcp_override_port) ||
+		(ntohs(inp->inp_fport) == tcp_override_port)))
+		bufsize = tcp_override_recvspace;
+
 	if (bufsize > mss) {
 		bufsize = roundup(bufsize, mss);
 		if (bufsize > sb_max)
Index: tcp_subr.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/tcp_subr.c,v
retrieving revision 1.99
diff -u -r1.99 tcp_subr.c
--- tcp_subr.c	2001/04/20 11:58:56	1.99
+++ tcp_subr.c	2001/05/26 13:33:15
@@ -513,7 +513,7 @@
 	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
 	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
 	tp->t_rcvtime = ticks;
-        /*
+	/*
 	 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 	 * because the socket may be bound to an IPv6 wildcard address,
 	 * which may match an IPv4-mapped IPv6 address.
Index: tcp_usrreq.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/tcp_usrreq.c,v
retrieving revision 1.59
diff -u -r1.59 tcp_usrreq.c
--- tcp_usrreq.c	2001/04/20 11:58:56	1.59
+++ tcp_usrreq.c	2001/05/26 17:24:19
@@ -1012,6 +1012,30 @@
     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
 
 /*
+ * override_sendspace and override_recvspace will override the default
+ * send and receive window sizes (as specified above) as well as the
+ * sendpipe and recvpipe learned from the route table, if the source or
+ * destination port number is listed in override_port
+ *
+ * One use of this is a ftp server, where all the control sessions will
+ * transfer very little data, and the data sessions will transfer lots
+ * of data, here one will probably increase sendspace to allow for higher
+ * transfer rates for the data sessions, but there is no need to allocate
+ * a increased amount of buffers for the data sessions, so one would list
+ * port 21 in override_port, and configure override_sendspace and 
+ * override_recvspace for a lower number.
+ */
+u_long	tcp_override_sendspace = 1024*16;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, override_sendspace, CTLFLAG_RW, 
+    &tcp_override_sendspace , 0, "");
+u_long	tcp_override_recvspace = 1024*16;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, override_recvspace, CTLFLAG_RW, 
+    &tcp_override_recvspace , 0, "");
+u_short	tcp_override_port = 0;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, override_port, CTLFLAG_RW, 
+    &tcp_override_port , 0, "");
+
+/*
  * Attach TCP protocol to socket, allocating
  * internet protocol control block, tcp control block,
  * bufer space, and entering LISTEN state if to accept connections.
Index: tcp_var.h
===================================================================
RCS file: /home/ncvs/src/sys/netinet/tcp_var.h,v
retrieving revision 1.68
diff -u -r1.68 tcp_var.h
--- tcp_var.h	2001/04/17 18:14:37	1.68
+++ tcp_var.h	2001/05/26 16:34:58
@@ -351,6 +351,9 @@
 	{ "keepintvl", CTLTYPE_INT }, \
 	{ "sendspace", CTLTYPE_INT }, \
 	{ "recvspace", CTLTYPE_INT }, \
+	{ "override_sendspace", CTLTYPE_INT }, \
+	{ "override_recvspace", CTLTYPE_INT }, \
+	{ "override_port", CTLTYPE_INT }, \
 	{ "keepinit", CTLTYPE_INT }, \
 	{ "pcblist", CTLTYPE_STRUCT }, \
 	{ "delacktime", CTLTYPE_INT }, \
@@ -409,6 +412,9 @@
 extern	struct pr_usrreqs tcp_usrreqs;
 extern	u_long tcp_sendspace;
 extern	u_long tcp_recvspace;
+extern	u_long tcp_override_sendspace;
+extern	u_long tcp_override_recvspace;
+extern	u_short tcp_override_port;
 void	tcp_rndiss_init __P((void));
 tcp_seq	tcp_rndiss_next __P((void));
 u_int16_t