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How to access ethernet/mac header in link layer 2 dissector

Hi!

I want to calculate a CRC32 like specified in 802.3 over the complete ethernet paket including the 14 byte ethernet/mac header. I've implemented a link layer 2 dissector but I am only able to access bytes 14 onwards. Can someone tell me how to access bytes 0-13 from the dissector? Or how to accomplish to perform a CRC check another way? Thank you very much!

Best regards, Christoph