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authorDavid Gibson <david@gibson.dropbear.id.au>2022-11-30 15:13:01 +1100
committerStefano Brivio <sbrivio@redhat.com>2022-12-06 07:40:56 +0100
commit4ebb4905e9823d6c8fe7cec9ecce2bda7f2905ef (patch)
tree9a88efa3cb0dc9bcfc1263dcc6bb0fa647061214 /test
parent190169c544744d38a280fff0499f764642dad2e3 (diff)
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udp: Also bind() connected ports for "splice" forwarding
pasta handles "spliced" port forwarding by resending datagrams received on a bound socket in the init namespace to a connected socket in the guest namespace. This means there are actually three ports associated with each "connection". First there's the source and destination ports of the originating datagram. That's also the destination port of the forwarded datagram, but the source port of the forwarded datagram is the kernel allocated bound address of the connected socket. However, by bind()ing as well as connect()ing the forwarding socket we can choose the source port of the forwarded datagrams. By choosing it to match the original source port we remove that surprising third port number and no longer need to store port numbers in struct udp_splice_port. As a bonus this means that the recipient of the packets will see the original source port if they call getpeername(). This rarely matters, but it can't hurt. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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