4bbdc8a6a2
Add a new --restrict-address-families= command line option and corresponding RestrictAddressFamilies= setting for .nspawn files to restrict which socket address families may be used inside a container. Many address families such as AF_VSOCK and AF_NETLINK are not network-namespaced, so restricting access to them in containers improves isolation. The option supports allowlist and denylist modes (via ~ prefix), as well as "none" to block all families, matching the semantics of RestrictAddressFamilies= in unit files. The address family parsing logic is extracted into a shared parse_address_families() helper in parse-helpers.c, which is now also used by config_parse_address_families() in load-fragment.c. This is currently opt-in. In a future version, the default will be changed to restrict address families to AF_INET, AF_INET6 and AF_UNIX.
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