This bug is awaiting verification that the linux/5.13.0-22.22 kernel in
-proposed solves the problem. Please test the kernel and update this bug
with the results. If the problem is solved, change the tag
'verification-needed-impish' to 'verification-done-impish'. If the
problem still exists, change the tag 'verification-needed-impish' to
'verification-failed-impish'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-impish

** Tags added: verification-needed-hirsute

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https://bugs.launchpad.net/bugs/1947164

Title:
  ebpf:  bpf_redirect fails with ip6 gre interfaces

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Hirsute:
  Fix Committed
Status in linux source package in Impish:
  Fix Committed

Bug description:
  [Impact]

  The tc ebpf bpf_redirect() function cannot be used with ipv6 gre
  interface.

  This is fixed upstream with commit a3fa449ffcf5 ("net: handle
  ARPHRD_IP6GRE in dev_is_mac_header_xmit()"), included in linux v5.14.

  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3fa449ffcf5

  It would probably be good to also backport this one: 3b707c3008ca
  ("net: dev_is_mac_header_xmit() true for ARPHRD_RAWIP").

  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3b707c3008ca

  [Test Case]

  Create an ebpf program that redirect packets to an ipv6 gre interface
  and load it with tc.

  [Regression Potential]

  The patches are trivial, the potential regressions are low.

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