[IPV4]: Create ipv4_is_<type>(__be32 addr) functions

Change IPV4 specific macros LOOPBACK MULTICAST LOCAL_MCAST BADCLASS
and ZERONET macros to inline functions ipv4_is_<type>(__be32 addr)

Adds type safety and arguably some readability.

Changes since last submission:

Removed ipv4_addr_octets function
Used hex constants
Converted recently added rfc3330 macros

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/in.h

@@ -246,21 +246,82 @@ struct sockaddr_in {
 #include <asm/byteorder.h> 
 
 #ifdef __KERNEL__
-/* Some random defines to make it easier in the kernel.. */
+
-#define LOOPBACK(x)	(((x) & htonl(0xff000000)) == htonl(0x7f000000))
+static inline bool ipv4_is_loopback(__be32 addr)
-#define MULTICAST(x)	(((x) & htonl(0xf0000000)) == htonl(0xe0000000))
+{
-#define BADCLASS(x)	(((x) & htonl(0xf0000000)) == htonl(0xf0000000))
+	return (addr & htonl(0xff000000)) == htonl(0x7f000000);
-#define ZERONET(x)	(((x) & htonl(0xff000000)) == htonl(0x00000000))
+}
-#define LOCAL_MCAST(x)	(((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
+
+static inline bool ipv4_is_multicast(__be32 addr)
+{
+	return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
+}
+
+static inline bool ipv4_is_local_multicast(__be32 addr)
+{
+	return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
+}
+
+static inline bool ipv4_is_badclass(__be32 addr)
+{
+	return (addr & htonl(0xf0000000)) == htonl(0xf0000000);
+}
+
+static inline bool ipv4_is_zeronet(__be32 addr)
+{
+	return (addr & htonl(0xff000000)) == htonl(0x00000000);
+}
+
+#define LOOPBACK(x)		ipv4_is_loopback(x)
+#define MULTICAST(x)		ipv4_is_multicast(x)
+#define BADCLASS(x)		ipv4_is_badclass(x)
+#define ZERONET(x)		ipv4_is_zeronet(x)
+#define LOCAL_MCAST(x)		ipv4_is_local_multicast(x)
 
 /* Special-Use IPv4 Addresses (RFC3330) */
-#define PRIVATE_10(x)	(((x) & htonl(0xff000000)) == htonl(0x0A000000))
+
-#define LINKLOCAL_169(x) (((x) & htonl(0xffff0000)) == htonl(0xA9FE0000))
+static inline bool ipv4_is_private_10(__be32 addr)
-#define PRIVATE_172(x)	(((x) & htonl(0xfff00000)) == htonl(0xAC100000))
+{
-#define TEST_192(x)	(((x) & htonl(0xffffff00)) == htonl(0xC0000200))
+	return (addr & htonl(0xff000000)) == htonl(0x0a000000);
-#define ANYCAST_6TO4(x)	(((x) & htonl(0xffffff00)) == htonl(0xC0586300))
+}
-#define PRIVATE_192(x)	(((x) & htonl(0xffff0000)) == htonl(0xC0A80000))
+
-#define TEST_198(x)	(((x) & htonl(0xfffe0000)) == htonl(0xC6120000))
+static inline bool ipv4_is_private_172(__be32 addr)
+{
+	return (addr & htonl(0xfff00000)) == htonl(0xac100000);
+}
+
+static inline bool ipv4_is_private_192(__be32 addr)
+{
+	return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
+}
+
+static inline bool ipv4_is_linklocal_169(__be32 addr)
+{
+	return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
+}
+
+static inline bool ipv4_is_anycast_6to4(__be32 addr)
+{
+	return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
+}
+
+static inline bool ipv4_is_test_192(__be32 addr)
+{
+	return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
+}
+
+static inline bool ipv4_is_test_198(__be32 addr)
+{
+	return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
+}
 #endif
 
+#define PRIVATE_10(x)		ipv4_is_private_10(x)
+#define LINKLOCAL_169(x)	ipv4_is_linklocal_169(x)
+#define PRIVATE_172(x)		ipv4_is_private_172(x)
+#define TEST_192(x)		ipv4_is_test_192(x)
+#define ANYCAST_6TO4(x)		ipv4_is_anycast_6to4(x)
+#define PRIVATE_192(x)		ipv4_is_private_192(x)
+#define TEST_198(x)		ipv4_is_test_198(x)
+
 #endif	/* _LINUX_IN_H */