diff options
Diffstat (limited to 'include/linux/etherdevice.h')
| -rw-r--r-- | include/linux/etherdevice.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index b006ba0a9f42..45ded4be7b43 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -51,6 +51,25 @@ extern struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) +/* Reserved Ethernet Addresses per IEEE 802.1Q */ +static const u8 br_reserved_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; + +/** + * is_link_local - Determine if given Eth addr is a link local mcast address. + * @addr: Pointer to a six-byte array containing the Ethernet address + * + * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per + * IEEE 802.1Q 8.6.3 Frame filtering. + */ +static inline int is_link_local(const unsigned char *dest) +{ + __be16 *a = (__be16 *)dest; + static const __be16 *b = (const __be16 *)br_reserved_address; + static const __be16 m = cpu_to_be16(0xfff0); + + return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; +} + /** * is_zero_ether_addr - Determine if give Ethernet address is all zeros. * @addr: Pointer to a six-byte array containing the Ethernet address |