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mbuf_outbound_finalize and TCP_SUM16 hardware checksum

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mbuf_outbound_finalize and TCP_SUM16 hardware checksum

Subject: mbuf_outbound_finalize and TCP_SUM16 hardware checksum
From: Anton Kuzmin <email@hidden>
Date: Tue, 03 May 2005 13:04:28 +0100

Hello,

I wonder if this is a known problem (or me missing something obvious) - outgoing TCP packets to be sent via the built-in ethernet device (GMace) appear to have only MBUF_CSUM_REQ_SUM16 hardware checksum request flag set as seen by an output KPI interface filter, which needs to modify the packet and therefore calls mbuf_outbound_finalize to do the delayed checksums. But from the xnu source it seems that this function has no knowledge of this flag and does nothing to calculate the checksum.

Regards,
Anton

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