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With the use of `quinn-udp`, we are actually already using GRO for reading packets from the UDP socket. Especially during a test like iperf, it is thus very likely to read multiple packets from the same peer in a single syscall. In that case, `stride` tells us how they are split. Without handling `stride` correctly, we would be feeding multiple packets at once to boringtun which would (obviously) choke on it because its checksum verification fails. It turns out we can actually handle this quite nicely by returning an `Iterator<Item = Received>` and decapsulating them one-by-one.