Public bug reported:

[Impact]

Expose the IFLA_VXLAN_FAN_MAP constant via /proc and systcl, allowing
user space (e.g. iproute2) to consume it at run-time

[Fix]

Apply the attached patch and rebuild the kernel

[How to test]

$ sudo modprobe vxlan

$ sudo sysctl -a | grep -i vxlan
net.fan.IFLA_VXLAN_FAN_MAP = 34
net.fan.vxlan = 4

$ cat /proc/sys/net/fan/IFLA_VXLAN_FAN_MAP
34

[Regression potential]

None, we are adding a new /proc / sysctl entry and no sw depends on it
ATM.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Plucky)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2106115

Title:
  Expose IFLA_VXLAN_FAN_MAP version via sysctl/proc

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