[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>
This commit is contained in:
parent
8f937c6099
commit
79165121bc
|
@ -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 */
|
||||
|
|
Loading…
Reference in New Issue