+
+static unsigned const ethernet_polynomial = 0x04c11db7U;
+static inline u32 ether_crc(int length, unsigned char *data)
+{
+ int crc = -1;
+
+ while(--length >= 0) {
+ unsigned char current_octet = *data++;
+ int bit;
+ for (bit = 0; bit < 8; bit++, current_octet >>= 1)
+ crc = (crc << 1) ^
+ ((crc < 0) ^ (current_octet & 1) ?
+ ethernet_polynomial : 0);
+ }
+ return crc;
+}
+