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Commit 2658fa80 authored by Joe Perches's avatar Joe Perches Committed by David S. Miller
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[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: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 586f1211

include/linux/in.h

+74 −13
Original line number Diff line number Diff line
@@ -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))

#define MULTICAST(x)	(((x) & htonl(0xf0000000)) == htonl(0xe0000000))

#define BADCLASS(x)	(((x) & htonl(0xf0000000)) == htonl(0xf0000000))

#define ZERONET(x)	(((x) & htonl(0xff000000)) == htonl(0x00000000))

#define LOCAL_MCAST(x)	(((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))



static inline bool ipv4_is_loopback(__be32 addr)

{

	return (addr & htonl(0xff000000)) == htonl(0x7f000000);

}



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))

#define PRIVATE_172(x)	(((x) & htonl(0xfff00000)) == htonl(0xAC100000))

#define TEST_192(x)	(((x) & htonl(0xffffff00)) == htonl(0xC0000200))

#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_10(__be32 addr)

{

	return (addr & htonl(0xff000000)) == htonl(0x0a000000);

}



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 */