Cleaned up system configuration files -- removed few obsolete parameters,

documented the remaining ones (sysdep/cf/README).

Available configurations:

   o  linux-20: Old Linux interface via /proc/net/route (selected by default
		on pre-2.1 kernels).
   o  linux-21: Old Linux interface, but device routes handled by the
		kernel (selected by default for 2.1 and newer kernels).
   o  linux-22: Linux with Netlink (I play with it a lot yet, so it isn't
		a default).
   o  linux-ipv6: Prototype config for IPv6 on Linux. Not functional yet.

configure.in

@@ -47,7 +47,11 @@ elif test -f sysconfig.h ; then
 	sysdesc=sysconfig
 else
 	case "$host_os" in
-		linux*)		sysdesc=linux-20 ;;
+		linux*)		case `uname -r` in
+					1.*|2.0.*)	sysdesc=linux-20 ;;
+					*)		sysdesc=linux-21 ;;
+					esac
+				;;
 		*)		AC_MSG_RESULT(unknown)
 				AC_MSG_ERROR([Cannot determine correct system configuration.])
 				;;

sysdep/cf/README

@@ -0,0 +1,10 @@
+Available configuration variables:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+CONFIG_TOS		Routing by TOS supported
+CONFIG_AUTO_ROUTES	Device routes are added automagically by the kernel
+CONFIG_ALL_MULTICAST	All devices support multicasting (i.e., ignore IFF_MULTICAST)
+
+CONFIG_UNIX_IFACE	Use Unix interface scanner
+CONFIG_UNIX_SET		Use Unix route setting
+CONFIG_LINUX_SCAN	Use Linux /proc/net/route scanner

sysdep/cf/linux-20.h

@@ -1,14 +1,12 @@
 /*
  *	Configuration for Linux 2.0 based systems
  *
- *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
 #undef CONFIG_TOS
-#undef CONFIG_MULTIPATH
-#undef CONFIG_NETLINK
 #undef CONFIG_AUTO_ROUTES
 #define CONFIG_ALL_MULTICAST
 

sysdep/cf/linux-21.h

@@ -1,19 +1,20 @@
 /*
- *	Configuration for Linux 2.1 based systems
+ *	Configuration for Linux 2.1/2.2 based systems without Netlink
  *
  *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
-#define CONFIG_TOS
+#undef CONFIG_TOS
-#define CONFIG_MULTIPATH
-#define CONFIG_NETLINK
 #define CONFIG_AUTO_ROUTES
 #define CONFIG_ALL_MULTICAST
 
+#define CONFIG_UNIX_IFACE
+#define CONFIG_UNIX_SET
+#define CONFIG_LINUX_SCAN
+
 /*
-Link: sysdep/linux/netlink
 Link: sysdep/linux
 Link: sysdep/unix
  */

sysdep/cf/linux-22.h

@@ -0,0 +1,17 @@
+/*
+ *	Configuration for Linux 2.2 based systems
+ *
+ *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#define CONFIG_TOS
+#define CONFIG_AUTO_ROUTES
+#define CONFIG_ALL_MULTICAST
+
+/*
+Link: sysdep/linux/netlink
+Link: sysdep/linux
+Link: sysdep/unix
+ */

sysdep/cf/linux-v6.h

@@ -1,7 +1,7 @@
 /*
- *	Configuration for Linux 2.1 based systems running IPv6
+ *	Configuration for Linux 2.2 based systems running IPv6
  *
- *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
@@ -9,12 +9,11 @@
 #define IPV6
 
 #define CONFIG_TOS
-#define CONFIG_MULTIPATH
-#define CONFIG_NETLINK
 #define CONFIG_AUTO_ROUTES
 #define CONFIG_ALL_MULTICAST
 
 /*
+Link: sysdep/linux/netlink
 Link: sysdep/linux
 Link: sysdep/unix
  */

sysdep/linux/netlink/netlink.c

@@ -25,18 +25,6 @@
 #include "lib/krt.h"
 #include "lib/socket.h"
 
-/*
- *	We need to work around namespace conflicts between us and the kernel,
- *	but I prefer this way to being forced to rename our configuration symbols.
- *	This will disappear as soon as netlink headers become part of the libc.
- */
-
-#undef CONFIG_NETLINK
-#include <linux/config.h>
-#ifndef CONFIG_NETLINK
-#error "Kernel not configured to support netlink"
-#endif
-
 #include <asm/types.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>