Merge tag 'batadv-net-pullrequest-20201127' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here are some batman-adv bugfixes:

 - Fix head/tailroom issues for fragments, by Sven Eckelmann (3 patches)

* tag 'batadv-net-pullrequest-20201127' of git://git.open-mesh.org/linux-merge:
  batman-adv: Don't always reallocate the fragmentation skb head
  batman-adv: Reserve needed_*room for fragments
  batman-adv: Consider fragmentation for needed_headroom
====================

Link: https://lore.kernel.org/r/20201127173849.19208-1-sw@simonwunderlich.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>