** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Cosmic)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1806392

Title:
  tun/tap: unable to manage carrier state from userland

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed

Bug description:
  === SRU Justification ===
  [Impact]
  Userspace cannot change tun's carrier state.

  [Fix]
  Add .ndo_change_carrier callback for tun.

  [Test]
  User confirm the backport works.
   
  [Regression Potential]
  Low. It add a new function and a new case switch for ioctl, but the new
  code doesn't affect existing behavior.
  === Original Bug Report ===
  This upstream patch is missing: 26d31925cd5e ("tun: implement carrier 
change").

  https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-
  next.git/commit/?id=26d31925cd5e

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