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authorDavid Gibson <david@gibson.dropbear.id.au>2023-11-07 12:40:14 +1100
committerStefano Brivio <sbrivio@redhat.com>2023-11-07 09:53:38 +0100
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treef370685539af23aac80fdf26747d18632b89b5c4 /udp.h
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pif: Introduce notion of passt/pasta interface
We have several possible ways of communicating with other entities. We use sockets to communicate with the host and other network sites, but also in a different context to communicate "spliced" channels to a namespace. We also use a tuntap device or a qemu socket to communicate with the namespace or guest. For the time being these are just defined implicitly by how we structure things. However, there are other communication channels we want to use in future (e.g. virtio-user), and we want to allow more flexible forwarding between those. To accomplish that we're going to want a specific way of referring to those channels. Introduce the concept of a "passt/pasta interface" or "pif" representing a specific channel to communicate network data. Each pif is assumed to be associated with a specific network namespace in the broad sense (that is as a place where IP addresses have a consistent meaning - not the Linux specific sense). But there could be multiple pifs communicating with the same namespace (e.g. the spliced and tap interfaces in pasta). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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