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This implements flow preparation on the source, transfer of data with a format roughly inspired by struct tcp_tap_conn, plus a specific structure for parameters that don't fit in the flow table, and flow insertion on the target, with all the appropriate window options, window scaling, MSS, etc. Contents of pending queues are transferred as well. The target side is rather convoluted because we first need to create sockets and switch them to repair mode, before we can apply options that are *not* stored in the flow table. This also means that, if we're testing this on the same machine, in the same namespace, we need to close the listening socket on the source before we can start moving data. Further, we need to connect() the socket on the target before we can restore data queues, but we can't do that (again, on the same machine) as long as the matching source socket is open, which implies an arbitrary limit on queue sizes we can transfer, because we can only dump pending queues on the source as long as the socket is open, of course. Co-authored-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Tested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> |
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