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[Bug 1758091] Re: vmxnet3 unable to send IPv6 ESP packets

From: Thomas Jansen
Subject: [Bug 1758091] Re: vmxnet3 unable to send IPv6 ESP packets
Date: Sat, 14 Nov 2020 05:54:54 -0000

** Changed in: qemu
       Status: Incomplete => New

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  vmxnet3 unable to send IPv6 ESP packets

Status in QEMU:

Bug description:
  My vmxnet3 network driver (in a closed source custom OS) is unable to
  send network packets that are structured as follows: Ethernet-
  Header(IPv6-Header(ESP(encrypted data))). I can verify that the packet
  is sent in the VM but is dropped in qemu. I first encountered this
  problem on qemu 2.10.1 but master is affected as well. After some
  debug printing in qemu I could identify the following call chain as
  being problematic:


  The problem seems to be the definition of the ESP header
  that does not follow the standard IPv6 extension header format
  starting with next type and length. Thus the parsed ext_hdr in
  eth_parse_ipv6_hdr does not contain valid data, in particular the
  length will contain bogus data and lead to a info->full_hdr_len that
  is larger than the packet itself and the loop would then try to read
  beyond the end of the packet.

  Using the e1000 driver I can send these packets. My guess is that the
  net_tx_pkt_parse function is not called in that case.

  My guess for a fix would be to remove "case IP6_ESP:" from
  eth_is_ip6_extension_header_type and not regard the ESP header as a
  IPv6 extension header. In a quick test this seems to fix the problem.
  But that should be verified by someone who is familiar with the code.

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