Re: [Xen-devel] [PATCH] Network Checksum Removal

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25 May 2005, at 22:47, Keir Fraser wrote:

> This may be a hard one to fix. The problem is probably that the 
> packets coming from domU haven't been checksummed, so a checksum check 
> will fail. We set ip_summed==CHECKSUM_UNNECESSARY, but perhaps the 
> firewall code checksums anyway, or the bridge is clobbering ip_summed 
> when it locally delivers. :-(
Perhaps not so hard....

Try modifying tcp_error() in 
net/ipv4/netfilter/ip_conntrack_proto_tcp.c.
Wrap the entire if statement that checks for invalid checksum in:
  if ( skb->ip_summed != CHECKSUM_UNNECESSARY ) {
       <checksum checking code goes here>
  }

I expect this should solve the problem. :-)

 -- Keir


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