Commits on Dec 17, 2015

1. Add overlay network support < 3.16 kernels …

   Add support for overlay networking in older kernels.
   
   Following were done to achieve this:
       + Create the vxlan network in host namespace.
       + This may create conflicts with other private
         networks so check for conflicts and fail a
         join if there is any conflict.
       + Add iptable based filtering to only allow
         subnet bridges in the same network to forward
         traffic while different network bridges will
         not be able to forward b/w each other. Also
         block traffic to overlay network originating
         from the host itself.
   
   Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>

   

   mrjana committed Dec 17, 2015
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