1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index b006ba0a9f42..243eea1e33d8 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -51,6 +51,26 @@ 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 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
+{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+/**
+ * is_link_local_ether_addr - Determine if given Ethernet address is link-local
+ * @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 bool is_link_local_ether_addr(const u8 *addr)
+{
+        __be16 *a = (__be16 *)addr;
+        static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
+        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