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authorDavid Gibson <david@gibson.dropbear.id.au>2024-02-28 22:25:18 +1100
committerStefano Brivio <sbrivio@redhat.com>2024-02-29 09:48:21 +0100
commitf15be719b370ab694b933ab7ceb7fc3481687284 (patch)
tree724183bd198c19be95bd2957936768ef318b901c /fwd.c
parent3b59b9748aa13a244c173585dfbaf79dfff9ea8f (diff)
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tap: Disallow loopback addresses on tap interface
The "tap" interface, whether it's actually a tuntap device or a qemu socket, presents a virtual external link between different network hosts. Hence, loopback addresses make no sense there. However, nothing prevents the guest from putting bogus packets with loopback addresses onto the interface and it's not entirely clear what effect that will have on passt. Explicitly test for such packets and drop them. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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