3459050c9a
In two places in ip6_output we are doing (delayed) checksum calculations. The initial logic came from SCTP in r205075,205104 and later I copied and adjusted it for the TCP|UDP case in r235958. The problem was that the original SCTP offsets were already wrong for any case with extension headers present given IPv6 extension headers are not part of the pseudo checksum calculations. The later changes do not help in case there is checksum offloading as for extension headers (incl. fragments) we do currrently never offload as we have no infrastructure to know whether the NIC can handle these cases. Correct the offsets for delayed checksum calculations and properly handle mbuf flags. In addition harmonize the almost identical duplicate code. While here eliminate the now unneeded variable hlen and add an always missing mtod() call in the 1-b and 3 cases after the introduction of the mb_unmapped_to_ext() calls. Reported by: Francis Dupont (fdupont isc.org) PR: 243675 MFC after: 6 days Reviewed by: markj (earlier version), gallatin Differential Revision: https://reviews.freebsd.org/D23760
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