uapi/in.h: Allow class-e address assignment

While most distributions long ago switched to the iproute2 suite
of utilities, which allow class-e (240.0.0.0/4) address assignment,
distributions relying on busybox, toybox and other forms of
ifconfig cannot assign class-e addresses without this kernel patch.

While CIDR has been obsolete for 2 decades, and a survey of all the
open source code in the world shows the IN_whatever macros are also
obsolete... rather than obsolete CIDR from this ioctl entirely, this
patch merely enables class-e assignment, sanely.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index a4f143b301582440914561504c630ca2d3d2c7fe..92242d20f9d0634a2ffcc9c5cf81ad1d273c95ef 100644 (file)
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -266,10 +266,14 @@ struct sockaddr_in {
 
 #define        IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 #define        IN_MULTICAST(a)         IN_CLASSD(a)
-#define IN_MULTICAST_NET       0xF0000000
+#define        IN_MULTICAST_NET        0xe0000000
 
-#define        IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
-#define        IN_BADCLASS(a)          IN_EXPERIMENTAL((a))
+#define        IN_BADCLASS(a)          ((((long int) (a) ) == 0xffffffff)
+#define        IN_EXPERIMENTAL(a)      IN_BADCLASS((a))
+
+#define        IN_CLASSE(a)            ((((long int) (a)) & 0xf0000000) == 0xf0000000)
+#define        IN_CLASSE_NET           0xffffffff
+#define        IN_CLASSE_NSHIFT        0
 
 /* Address to accept any incoming messages. */
 #define        INADDR_ANY              ((unsigned long int) 0x00000000)