Change the default local address range for IP from 1024 through 5000

to 20000 through 30000.  These numbers are used for local IP port numbers
when an explicit address is not specified.

The values are sysctl modifiable under: net.inet.ip.port_{first|last}_auto

These numbers do not overlap with any known server addresses, without going
above 32768 which are "negative" on some other implementations.

20000 through 30000 is 2.5 times larger than the old range, but some have
suggested even that may not be enough... (gasp!)  Setting a low address
of 10000 should be plenty.. :-)

1 files changed, 18 insertions, 4 deletions

diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c
index 73d564f..6fa0d2f 100644
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)in_pcb.c	8.4 (Berkeley) 5/24/95
- *	$Id: in_pcb.c,v 1.14 1995/10/29 15:32:25 phk Exp $
+ *	$Id: in_pcb.c,v 1.15 1995/11/14 20:33:59 phk Exp $
  */
 
 #include <sys/param.h>
@@ -46,6 +46,8 @@
 #include <sys/time.h>
 #include <sys/proc.h>
 #include <sys/queue.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
 
 #include <net/if.h>
 #include <net/route.h>
@@ -59,6 +61,18 @@
 
 struct	in_addr zeroin_addr;
 
+/*
+ * These configure the range of local port addresses assigned to
+ * "unspecified" outgoing connections/packets/whatever.
+ */
+static int ipport_firstauto = IPPORT_FIRSTAUTO;
+static int ipport_lastauto = IPPORT_LASTAUTO;
+
+SYSCTL_INT(_net_inet_ip, OID_AUTO, port_first_auto, CTLFLAG_RW,
+	   &ipport_firstauto, 0, "");
+SYSCTL_INT(_net_inet_ip, OID_AUTO, port_last_auto, CTLFLAG_RW,
+	   &ipport_lastauto, 0, "");
+
 static void	 in_pcbinshash __P((struct inpcb *));
 static void	 in_rtchange __P((struct inpcb *, int));
 
@@ -151,9 +165,9 @@ in_pcbbind(inp, nam)
 	if (lport == 0)
 		do {
 			++*lastport;
-			if (*lastport < IPPORT_RESERVED ||
-			    *lastport > IPPORT_USERRESERVED)
-				*lastport = IPPORT_RESERVED;
+			if (*lastport < ipport_firstauto ||
+			    *lastport > ipport_lastauto)
+				*lastport = ipport_firstauto;
 			lport = htons(*lastport);
 		} while (in_pcblookup(head,
 			    zeroin_addr, 0, inp->inp_laddr, lport, wild));