Fix size calculations to prevent overflowing fake_eth_hdr in IP layer mode #775
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sizeof(fake_eth_hdr) - sizeof(struct ether_header)bytes to&fake_eth_hdr[sizeof(struct ether_header)], avoiding overflow offake_eth_hdrbuflenmatches effective amount of data inbytesafter pointingbytestofake_eth_hdrShould fix #580.