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Re: [RFC Patch v2] Unify mpp/mesh_path handling for Mac 802.11s

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On Wed, May 28, 2014 at 12:43 PM, Yeoh Chun-Yeow <yeohchunyeow@xxxxxxxxx> wrote:
>> While looking through the code I noticed that there seems to be no code-path
>> that removes stall mpp_path entries (except for the removal of the mesh
>> interface) ! Unless I overlooked something this would be a way to use up all
>> existing memory of the kernel by sending it 802.11s packets with changing
>> proxied addresses.
>
> AFAIK, we don't really "manage" the mpp path and relying on incoming
> packet to update the mpp path table.

Imagine a malicious or maybe misbehaving node that is sending you
proxied traffic and is just counting up the source mac address. Every
received packet would generate another entry in the mpp_path table.

Even without this, one usecase for 802.11s is to connect multiple
access points and allow clients to roam between them and not loosing
internet connectivity through a gateway. A scenario like this would
have one mpp_path table entry for every client that has connected to
the network... even if it has been years ago.

Henning Rogge
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