This bug is awaiting verification that the 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-
eoan' to 'verification-done-eoan'. If the problem still exists, change
the tag 'verification-needed-eoan' to 'verification-failed-eoan'.

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.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
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** Tags added: verification-needed-eoan

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https://bugs.launchpad.net/bugs/1860969

Title:
  ipsec interfaces: fix sending with bpf_redirect() / AF_PACKET sockets

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  New
Status in linux source package in Bionic:
  New
Status in linux source package in Eoan:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed

Bug description:
  [SRU Justification]

  [Impact]

  Packets sent to a vti[6]/xfrm interface via bpf_redirect() or via an
  AF_PACKET socket are dropped (no carrier).

  This has been fixed in v5.5 by the following upstream commits
   - 95224166a903 ("vti[6]: fix packet tx through bpf_redirect()")
   - f042365dbffe ("xfrm interface: fix packet tx through bpf_redirect()")

  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95224166a903
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f042365dbffe

  The bug exists since the beginning of each driver.

  == Fix ==

  Backport the requested patches to Focal (5.4), Eoan (5.3), Bionic (4.15) and
  Xenial (4.4).

  == Risk of Regression ==

  This patch affects only the cases described above (when no dst is
  attached to the skb), thus the risk should be low.

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