On Thu, Nov 28, 2019 at 06:15:16PM +0100, Stefano Garzarella wrote: > Hi, > now that we have multi-transport upstream, I started to take a look to > support network namespace (netns) in vsock. > > As we partially discussed in the multi-transport proposal , it could > be nice to support network namespace in vsock to reach the following > goals: > - isolate host applications from guest applications using the same ports > with CID_ANY > - assign the same CID of VMs running in different network namespaces > - partition VMs between VMMs or at finer granularity > > This preliminary implementation provides the following behavior: > - packets received from the host (received by G2H transports) are > assigned to the default netns (init_net) > - packets received from the guest (received by H2G - vhost-vsock) are > assigned to the netns of the process that opens /dev/vhost-vsock > (usually the VMM, qemu in my tests, opens the /dev/vhost-vsock) > - for vmci I need some suggestions, because I don't know how to do > and test the same in the vmci driver, for now vmci uses the > init_net > - loopback packets are exchanged only in the same netns > > Questions: > 1. Should we make configurable the netns (now it is init_net) where > packets from the host should be delivered?
Yes, it should be possible to have multiple G2H (e.g. virtio-vsock) devices and to assign them to different net namespaces. Something like net/core/dev.c:dev_change_net_namespace() will eventually be needed. > 2. Should we provide an ioctl in vhost-vsock to configure the netns > to use? (instead of using the netns of the process that opens > /dev/vhost-vsock) Creating the vhost-vsock instance in the process' net namespace makes sense. Maybe wait for a use case before adding an ioctl. > 3. Should we provide a way to disable the netns support in vsock? The code should follow CONFIG_NET_NS semantics. I'm not sure what they are exactly since struct net is always defined, regardless of whether network namespaces are enabled.
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