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[Bug 1860969] Re: ipsec interfaces: fix sending with bpf_redirect() / AF_PACKET sockets

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>
Date: Thu, 06 Feb 2020 20:28:52 -0000
Reply-to: Bug 1860969 <1860969@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

These have already been applied to our 5.4 focal tree through upstream
stable updates.

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: Incomplete

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Focal)
       Status: Incomplete => Fix Committed

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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:
  New
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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