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commit 743a9e9ebf61ac0f2f164376c906946d8dd7e3ea
Author:     Idan Horowitz <idan.horowitz@gmail.com>
AuthorDate: Sat Nov 25 16:38:19 2023 +0200
Commit:     Andreas Kling <kling@serenityos.org>
CommitDate: Sat Nov 25 16:34:38 2023 +0100

    Kernel: Stop including the ethernet header in LoopbackAdapter's mtu
    
    The networking subsystem currently assumes all adapters are Ethernet
    adapters, including the LoopbackAdapter, so all packets are pre-pended
    with an Ethernet Frame header. Since the MTU must not include any
    overhead added by the data-link (Ethernet in this case) or physical
    layers, we need to subtract it from the MTU.
    
    This fixes a kernel panic which occurs when sending a packet that is at
    least 65523 bytes long through the loopback adapter, which results in
    the kernel "receiving" a packet which is larger than the support MTU
    out the other end. (As the actual final size was increased by the
    addition of the ethernet frame header)