1 files changed, 29 insertions, 0 deletions
diff --git a/lib/ipv4.c b/lib/ipv4.c
new file mode 100644
index 00000000..52f5b0b2
--- /dev/null
+++ b/lib/ipv4.c
@@ -0,0 +1,29 @@
+/*
+ *	BIRD Library -- IPv4 Address Manipulation Functions
+ *
+ *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include "nest/bird.h"
+#include "lib/ip.h"
+
+int
+ipv4_classify(u32 a)
+{
+  u32 b = a >> 24U;
+
+  if (b && b <= 0xdf)
+    {
+      if (b == 0x7f)
+	return IADDR_HOST | SCOPE_HOST;
+      else
+	return IADDR_HOST | SCOPE_UNIVERSE;
+    }
+  if (b >= 0xe0 && b <= 0xef)
+    return IADDR_MULTICAST | SCOPE_UNIVERSE;
+  if (a == 0xffffffff)
+    return IADDR_BROADCAST | SCOPE_LINK;
+  return IADDR_INVALID;
+}