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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
[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>
authored by
Michael Ellerman
and committed by
David S. Miller
79165121
8f937c60
+18
-4
include/linux/etherdevice.h
+18
-4
include/linux/etherdevice.h
···
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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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*
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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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}
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/**
···
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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 /* _LINUX_ETHERDEVICE_H */
···
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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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/**
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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.
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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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/* 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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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 /* __KERNEL__ */
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#endif /* _LINUX_ETHERDEVICE_H */