Yu Watanabe
be0825c33a
With `systemd.imds.network=locked`, imdsd cannot reach IMDS at all. Our sysctl.d/50-default.conf enables IPv4 reverse path filtering for all links. Locked mode adds a "prohibit" route for the IMDS address to the main table. imdsd's marked sockets use their own table, so its _requests_ get out. But IMDS's _replies_ carry no mark: the reverse path filter checks their source against the main table, finds the prohibit route, and drops them. To fix this, turn off reverse path filtering on the configured links in locked mode. The prohibit route still blocks direct access for everybody else. Caveat: This does not help where `net.ipv4.conf.all.rp_filter` is on, as the kernel applies the maximum of that and the link's setting. Ubuntu does that by default, so for now this only works out of the box on Debian, Fedora, etc. Cover that case in the tests, and expect a timeout/failure with `all.rp_filter > 0`. Fixes #44602
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