tree 2a30bf033c1dcdc1db5ab6701ebbf05792fca5c1
parent 8eb6e674a19e0b855f07756f62b9cf4fec9aa95e
author Tennessee Carmel-Veilleux <tennessee.carmelveilleux@gmail.com> 1670444729 -0500
committer GitHub <noreply@github.com> 1670444729 -0500
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Introduce basic UDP packet filtering scheme (#23957)

* Introduce basic UDP packet filtering scheme

- Embedded class devices on Wi-Fi networks can see large number of
  mDNS packets from normal network. If these arrive while device
  is processing CASE/PASE or any other long running system activity,
  the amount of queuing can overrun the packet buffer pools or
  event queues, which can cause very bad outcomes.
- Filtering of packets can always be done by a product deep in its
  network stack. However, allowing some level of basic filtering
  for UDP packets (that cover most of the traffic that could be
  problematic and need queuing) for at least lwIP devices allows
  sharing code for filters that may be smarter.

Follow-up PR will show an example hook-up to ESP32

Issue #23258
Issue #23180

This PR:
- Adds generic EndpointQueueFilter.h, which is portable/testable
  on its own.
- Adds hook-ups to UDPEndPointImplLwIP to run an EndpointQueueFilter
  on incoming packets

Testing done:
- Full unit test suite for the filtering framework and basic
  filter.

* Address review comments