[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: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -55,19 +55,33 @@ static inline int is_zero_ether_addr(const u8 *addr)
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return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
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}
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/**
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* is_multicast_ether_addr - Determine if the given Ethernet address is a
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* multicast address.
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*
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is a multicast address.
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*/
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static inline int is_multicast_ether_addr(const u8 *addr)
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{
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return addr[0] & 0x01;
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}
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/**
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* is_valid_ether_addr - Determine if the given Ethernet address is valid
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
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* a multicast address, and is not FF:FF:FF:FF:FF:FF. The multicast
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* and FF:FF:... tests are combined into the single test "!(addr[0]&1)".
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* a multicast address, and is not FF:FF:FF:FF:FF:FF.
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*
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* Return true if the address is valid.
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*/
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static inline int is_valid_ether_addr(const u8 *addr)
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{
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return !(addr[0]&1) && !is_zero_ether_addr(addr);
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/* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
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* explicitly check for it here. */
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return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
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}
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/**
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@ -83,6 +97,6 @@ static inline void random_ether_addr(u8 *addr)
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addr [0] &= 0xfe; /* clear multicast bit */
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addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _LINUX_ETHERDEVICE_H */
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