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Commit 79165121 authored by Michael Ellerman's avatar Michael Ellerman Committed by David S. Miller
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[NET]: Add is_multicast_ether_addr() in include/linux/etherdevice.h 



This patch adds is_multicast_ether_addr() to go along with
is_valid_ether_addr() and friends. It then changes
is_valid_ether_addr() to use the new macro, and fixes up the comment
on that function to move implementation details out of the API doco.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8f937c60

include/linux/etherdevice.h

+18 −4
Original line number Diff line number Diff line
@@ -55,19 +55,33 @@ static inline int is_zero_ether_addr(const u8 *addr) 
	return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);

}



/**

 * is_multicast_ether_addr - Determine if the given Ethernet address is a

 * multicast address.

 *

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Return true if the address is a multicast address.

 */

static inline int is_multicast_ether_addr(const u8 *addr)

{

	return addr[0] & 0x01;

}



/**

 * is_valid_ether_addr - Determine if the given Ethernet address is valid

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not

 * a multicast address, and is not FF:FF:FF:FF:FF:FF.  The multicast

 * and FF:FF:... tests are combined into the single test "!(addr[0]&1)".

 * a multicast address, and is not FF:FF:FF:FF:FF:FF.

 *

 * Return true if the address is valid.

 */

static inline int is_valid_ether_addr(const u8 *addr)

{

	return !(addr[0]&1) && !is_zero_ether_addr(addr);

	/* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to

	 * explicitly check for it here. */

	return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);

}



/**
@@ -83,6 +97,6 @@ static inline void random_ether_addr(u8 *addr) 
	addr [0] &= 0xfe;	/* clear multicast bit */

	addr [0] |= 0x02;	/* set local assignment bit (IEEE802) */

}

#endif

#endif	/* __KERNEL__ */



#endif	/* _LINUX_ETHERDEVICE_H */