2 files changed, 6 insertions, 4 deletions
diff --git a/TODO b/TODO
index 87eb4cb..f001bd4 100644
--- a/TODO
+++ b/TODO
@@ -2,6 +2,8 @@ Core
 ~~~~
 * protocols: implement dumping of protocol-dependent rte attributes
 
+- io.c: refuse old-style multicasts for unnumbered interfaces?
+
 - prefer loopback addresses as router IDs (dummy interface?)
 
 - config: executable config files
diff --git a/lib/ipv4.c b/lib/ipv4.c
index 04e15b0..186b36a 100644
--- a/lib/ipv4.c
+++ b/lib/ipv4.c
@@ -6,8 +6,6 @@
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
-#ifndef IPV6
-
 #include <string.h>
 #include <stdlib.h>
 
@@ -24,6 +22,10 @@ ipv4_classify(u32 a)
     {
       if (b == 0x7f)
 	return IADDR_HOST | SCOPE_HOST;
+      else if (b == 0x0a ||
+	       (a & 0xffff0000) == 0xc0a80000 ||
+	       (a & 0xfff00000) == 0xac100000)
+	return IADDR_HOST | SCOPE_SITE;
       else
 	return IADDR_HOST | SCOPE_UNIVERSE;
     }
@@ -92,5 +94,3 @@ ip_pton(char *a, ip_addr *o)
   *o = ipa_from_u32(ia);
   return 1;
 }
-
-#endif