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[NET]: Add is_multicast_ether_addr() in include/linux/etherdevice.h

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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>
This commit is contained in:
Michael Ellerman 2005-05-29 20:24:30 -07:00 committed by David S. Miller
parent 8f937c6099
commit 79165121bc
1 changed files with 18 additions and 4 deletions
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22
include/linux/etherdevice.h
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@ -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 */