[FS#3546] ieee80211w breaks WLAN routing intra-zone

[OpenWrt Bugs]

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User who did this - BinaryEvolved (BinaryEvolved) 

Attached to Project - OpenWrt/LEDE Project
Summary - ieee80211w breaks WLAN routing intra-zone
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - **Device**: Linksys WRT1900ACS
**Software Versions**: 
  * OpenWrt 19.07.5 r11257-5090152ae3
  * wpad-basic 2019-08-08-ca8c2bd2-4 or wpad-openssl 2019-08-08-ca8c2bd2-4
  * hostapd-common 2019-08-08-ca8c2bd2-4

====Problem:====
When setting 802.11w Management Frame Protection to optional in Luci or adding option ieee80211w '1' to /etc/config/wireless to a config wifi-iface, WLAN devices connected to AP are unable to route to other devices in the same subnet/interface. 
This only applies when attempting to send data to another client on the same WLAN interface. Clients can still send data to other WLAN interfaces or other subnets (when permitted by firewall).
End clients will received either "Host is down" or "No route".
====Examples:====
  * WLAN client assigned to 192.168.1.2 cannot find route to 192.168.1.3 with ieee80211w enabled
  * WLAN client assigned to 192.168.1.2 can find route to 192.168.2.2 with ieee80211w enabled
  * WLAN client assigned to 192.168.1.2 can find route to 192.168.2.2 with ieee80211w disabled


====Expected Behavior:====
Enabling Management Frame Protection to optional should not break routing to other devices on the same WLAN interface. If set to optional it should not break anything for clients that do not support it. If this is due to 

====Additional Info:====

  * I sadly do not have access to clients which support ieee80211w, so I am unable to test if this issue still occurs with devices that support the feature.
  * This issue occurs with either wpad-openssl or wpad-basic (I included both version numbers tested above)

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3546

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