Hello All,
When handle_incoming_queue (xen-netfront.c) calls checksum_setup()
the transport header didn't seem to be initialized yet.
skb_checksum_setup_ipv4 ends up initializing the checksum at incorrect offset.
if (recalculate)
*csum = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr,
skb->len - off,
ip_hdr(skb)->protocol, 0);
where csum is &tcp_hdr(skb)->check.
This problem got exposed when LRO was ON on the host.
It hits this case in checksum_setup().
/*
* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
* peers can fail to set NETRXF_csum_blank when sending a GSO
* frame. In this case force the SKB to CHECKSUM_PARTIAL and
* recalculate the partial checksum.
*/
skb->ip_summed was CHECKSUM_UNNECESSARY.
The guest was at 3.8.13 kernel.
I can send a patch if you think the problem exists in current releases too.
Thanks.
Venkat
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