diff options
Diffstat (limited to 'include/linux/etherdevice.h')
| -rw-r--r-- | include/linux/etherdevice.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 396c48cbaeb..a1478258d00 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -7,7 +7,7 @@ * * Version: @(#)eth.h 1.0.4 05/13/93 * - * Authors: Ross Biro, <bir7@leland.Stanford.Edu> + * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * * Relocated to include/linux where it belongs by Alan Cox @@ -56,18 +56,32 @@ static inline int is_zero_ether_addr(const u8 *addr) } /** + * 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 */ |