!
! Hide kernel option ROUTETABLES evaluations in the implementation
! rather than the header file.  With this also move RT_MAXFIBS and
! RT_NUMFIBS into the implemantion to avoid further usage in other
! code.
!
! This allows users to change the number of FIBs from 1..RT_MAXFIBS(16)
! dynamically using the tunable without the need to change the kernel
! config for the maximum anymore.  This means that thet multi-FIB
! feature is now fully available with GENERIC kernels.
! The kernel option ROUTETABLES can still be used to set the default
! numbers of FIBs in absence of the tunable.
!
! Reviewed by:	
! MFC after:	2 weeks
!
Index: sys/net/route.c
===================================================================
--- sys/net/route.c	(revision 233003)
+++ sys/net/route.c	(working copy)
@@ -68,6 +68,24 @@
 
 #include <vm/uma.h>
 
+/* We use 4 bits in the mbuf flags, thus we are limited to 16 FIBS. */
+#define	RT_MAXFIBS	16
+
+/* Kernel config default option. */
+#ifdef ROUTETABLES
+#if ROUTETABLES <= 0
+#error "ROUTETABLES defined too low"
+#endif
+#if ROUTETABLES > RT_MAXFIBS
+#error "ROUTETABLES defined too big"
+#endif
+#define	RT_NUMFIBS	ROUTETABLES
+#endif /* ROUTETABLES */
+/* Initialize to default if not otherwise set. */
+#ifndef	RT_NUMFIBS
+#define	RT_NUMFIBS	1
+#endif
+
 u_int rt_numfibs = RT_NUMFIBS;
 SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RD, &rt_numfibs, 0, "");
 /*
Index: sys/net/route.h
===================================================================
--- sys/net/route.h	(revision 233003)
+++ sys/net/route.h	(working copy)
@@ -90,27 +90,6 @@ struct rt_metrics {
 #define	RTM_RTTUNIT	1000000	/* units for rtt, rttvar, as units per sec */
 #define	RTTTOPRHZ(r)	((r) / (RTM_RTTUNIT / PR_SLOWHZ))
 
-/* MRT compile-time constants */
-#ifdef _KERNEL
- #ifndef ROUTETABLES
-  #define RT_NUMFIBS 1
-  #define RT_MAXFIBS 1
- #else
-  /* while we use 4 bits in the mbuf flags, we are limited to 16 */
-  #define RT_MAXFIBS 16
-  #if ROUTETABLES > RT_MAXFIBS
-   #define RT_NUMFIBS RT_MAXFIBS
-   #error "ROUTETABLES defined too big"
-  #else
-   #if ROUTETABLES == 0
-    #define RT_NUMFIBS 1
-   #else
-    #define RT_NUMFIBS ROUTETABLES
-   #endif
-  #endif
- #endif
-#endif
-
 #define	RT_DEFAULT_FIB	0	/* Explicitly mark fib=0 restricted cases */
 extern u_int rt_numfibs;	/* number fo usable routing tables */
 /*