Commits on Jan 18, 2021

1. ffh.exitnode: add MTU fix for QUIC …

   This commit creates a dummy interface with the "bottleneck" MTU
   among our VPN path (currently batadv - see issue #80).
   Furthermore it creates an iptables DNAT rule which changes the
   destination IP address of incoming QUIC (UDP 443) packets which
   exceed the bottleneck MTU to a special IPv4 continuity address
   which is part of the subnet of the dummy interface.
   When an oversized QUIC packet arrives, it will thus be routed
   to the dummy interface which in turn generates an ICMP destination
   unreachable (fragmentation needed) packet as the packet does
   not fit the MTU of the dummy interface.
   The QUIC servers will react to the ICMP packet by changing the
   PMTU of their UDP sockets according to the maximum MTU advertised
   in the ICMP message, which is the dummy interface's MTU.

   

   CodeFetch committed Jan 18, 2021
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