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conf: parse/format passt-related XML additions This implements XML config to represent a subset of the features supported by 'passt' (https://passt.top), which is an alternative backend for emulated network devices that requires no elevated privileges (similar to slirp, but "better"). Along with setting the backend to use passt (via <backend type='passt'/> when the interface type='user'), we also support passt's --log-file and --interface options (via the <backend> subelement logFile and upstream attributes) and its --tcp-ports and --udp-ports options (which selectively forward incoming connections to the host on to the guest) via the new <portForward> subelement of <interface>. Here is an example of the config for a network interface that uses passt to connect: <interface type='user'> <mac address='52:54:00:a8:33:fc'/> <ip address='192.168.221.122' family='ipv4'/> <model type='virtio'/> <backend type='passt' logFile='/tmp/xyzzy.log' upstream='eth0'/> <portForward address='10.0.0.1' proto='tcp' dev='eth0'> <range start='2022' to='22'/> <range start='5000' end='5099' to='1000'/> <range start='5010' end='5029' exclude='yes'/> </portForward> <portForward proto='udp'> <range start='10101'/> </portForward> </interface> In this case: * the guest will be offered address 192.168.221.122 for its interface via DHCP * the passt process will write all log messages to /tmp/xyzzy.log * routes to the outside for the guest will be derived from the addresses and routes associated with the host interface "eth0". * incoming tcp port 2022 to the host will be forwarded to port 22 on the guest. * incoming tcp ports 5000-5099 (with the exception of ports 5010-5029) to the host will be forwarded to port 1000-1099 on the guest. * incoming udp packets on port 10101 will be forwarded (unchanged) to the guest. Signed-off-by: Laine Stump <laine@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>

2022-11-11 19:43:45 +00:00

../qemuxml2argvdata/net-user-passt.xml