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@@ -55,19 +55,33 @@ static inline int is_zero_ether_addr(const u8 *addr)
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return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
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}
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+/**
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+ * is_multicast_ether_addr - Determine if the given Ethernet address is a
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+ * multicast address.
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+ *
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+ * @addr: Pointer to a six-byte array containing the Ethernet address
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+ *
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+ * Return true if the address is a multicast address.
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+ */
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+static inline int is_multicast_ether_addr(const u8 *addr)
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+{
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+ return addr[0] & 0x01;
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+}
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+
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/**
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* is_valid_ether_addr - Determine if the given Ethernet address is valid
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
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- * a multicast address, and is not FF:FF:FF:FF:FF:FF. The multicast
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- * and FF:FF:... tests are combined into the single test "!(addr[0]&1)".
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+ * a multicast address, and is not FF:FF:FF:FF:FF:FF.
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*
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* Return true if the address is valid.
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*/
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static inline int is_valid_ether_addr(const u8 *addr)
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{
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- return !(addr[0]&1) && !is_zero_ether_addr(addr);
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+ /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
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+ * explicitly check for it here. */
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+ return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
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}
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/**
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@@ -83,6 +97,6 @@ static inline void random_ether_addr(u8 *addr)
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addr [0] &= 0xfe; /* clear multicast bit */
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addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
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}
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-#endif
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+#endif /* __KERNEL__ */
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#endif /* _LINUX_ETHERDEVICE_H */
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