Public bug reported: The Hyper-V netvsc driver was looking at the incorrect status bits in the checksum info. It was setting the receive checksum unnecessary flag based on the IP header checksum being correct. The checksum flag is skb is about TCP and UDP checksum status. Because of this bug, any packet received with bad TCP checksum would be passed up the stack and to the application causing data corruption. The problem is reproducible via netcat and netem.
This had a side effect of not doing receive checksum offload on IPv6. The driver was also also always doing checksum offload independent of the checksum setting done via ethtool. Signed-off-by: Stephen Hemminger <sthem...@microsoft.com> https://patchwork.ozlabs.org/patch/685660/ When this patch is committed I will include the commit ID in this bug. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Patch added: "net-netvsc-fix-incorrect-receive-checksum-offloading.patch" https://bugs.launchpad.net/bugs/1636656/+attachment/4767243/+files/net-netvsc-fix-incorrect-receive-checksum-offloading.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1636656 Title: [Hyper-V] netvsc: fix incorrect receive checksum offloading To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1636656/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
