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authorDavid Gibson <david@gibson.dropbear.id.au>2022-11-30 15:13:08 +1100
committerStefano Brivio <sbrivio@redhat.com>2022-12-06 07:41:40 +0100
commit27bfebb0619d0b9c706bf235d4de935f9833110c (patch)
treeb18cfcacba13c404d8b3e2e72010338f54d3e0b4 /test/distro
parentc277c6dd7d90e6f83284ecf60b94c4693dd89322 (diff)
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udp: Re-use fixed bound sockets for packet forwarding when possible
When we look up udp_splice_to_ns[v6][src].target_sock in udp_sock_handler_splice, all we really require of the socket is that it be bound to port src in the pasta guest namespace. Similarly for udp_splice_to_init but bound in the init namespace. Usually these sockets are created temporarily by udp_splice_connect() and cleaned up by udp_timer(). However, depending on the -u and -U options its possible we have a permanent socket bound to the relevant port created by udp_sock_init(). If such a socket exists, we could use it instead of creating a temporary one. In fact we *must* use it, because we'll fail trying to bind() a temporary one to the same port. So allow this, store permanently bound sockets into udp_splice_to_{ns,init} in udp_sock_init(). These won't get incorrectly removed by the timer because we don't put a corresponding entry in the udp_act[] structure which directs the timer what to clean up. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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