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authorDavid Gibson <david@gibson.dropbear.id.au>2022-11-17 16:58:52 +1100
committerStefano Brivio <sbrivio@redhat.com>2022-11-25 01:35:22 +0100
commitd909fda1e81979da12ed4ab8b2f2a18fba756a07 (patch)
tree10598d5ebd35e5a454e860ecd66b838c1f7c563c /test
parent356c6e0677072f1a6cfe9b5d0648d89ab6fd5523 (diff)
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tcp: Use the same sockets to listen for spliced and non-spliced connections
In pasta mode, tcp_sock_init[46]() create separate sockets to listen for spliced connections (these are bound to localhost) and non-spliced connections (these are bound to the host address). This introduces a subtle behavioural difference between pasta and passt: by default, pasta will listen only on a single host address, whereas passt will listen on all addresses (0.0.0.0 or ::). This also prevents us using some additional optimizations that only work with the unspecified (0.0.0.0 or ::) address. However, it turns out we don't need to do this. We can splice a connection if and only if it originates from the loopback address. Currently we ensure this by having the "spliced" listening sockets listening only on loopback. Instead, defer the decision about whether to splice a connection until after accept(), by checking if the connection was made from the loopback address. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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