On Fri, 29 Aug 2008, George V. Neville-Neil wrote:
gnn 2008-08-29 20:42:58 UTC
FreeBSD src repository
Modified files:
sys/netinet ip_output.c
Log:
SVN rev 182463 on 2008-08-29 20:42:58Z by gnn
Fix a bug whereby multicast packets that are looped back locally
wind up with the incorrect checksum on the wire when transmitted via
devices that do checksum offloading.
It wouldn't surprise me if there are other related but obscure issues here
that this change fixes -- the output path for IP and below generally believes
pretty firmly that it owns and can write to the mbuf parts going down the
stack, such as prepending headers encapsulation headers, rewriting packets in
NAT, etc. Most will be very edge case because they probably work poorly or
not at all with multicast anyway, but...
Robert N M Watson
Computer Laboratory
University of Cambridge
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