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Graeme Foster
a923308c09
* networkd: classify links by Type instead of name prefix
The systemd-networkd backend decided wifi-vs-ethernet by checking
whether the interface name started with "wlan" or "wlp". Anything
else (that was not on a small virtual-prefix denylist) was treated
as wired ethernet. That misclassified two common cases:
* Nebula tunnels (kernel name like "nebula.homelab", Type=none,
Kind=tun) showed up as a wired ethernet device — DMS rendered an
"Ethernet connected" indicator whenever the overlay was up, even
with no physical NIC plugged in.
* Renamed wifi interfaces (e.g. systemd link files that rename
wlan0 to a friendlier name like "wifi") were also miscategorised
as ethernet, because they no longer matched wlan*/wlp*.
networkd already publishes the real link kind in the JSON returned
by the per-link Describe method ("ether", "wlan", "loopback",
"none"). Fetch it during enumerateLinks, cache it on linkInfo, and
classify against that. The old prefix logic is kept as a fallback
for the case where Describe ever fails to populate Type.
The package-level looksVirtual() helper replaces the unexported
isVirtualInterface method so the new classification helpers and
their tests can use it without needing a live backend.
Tests cover both the Type-based and fallback paths, including the
Nebula-shaped Type=none/tun case that motivated this change.
* networkd: cache linkType across signal ticks and unit-test Describe fallback
enumerateLinks runs on every PropertiesChanged signal under
/org/freedesktop/network1, which fires on carrier flap, DHCP renew, and
each address change. The previous version rebuilt every linkInfo from
scratch on each tick, including a synchronous Describe D-Bus round-trip
per link, despite the link Type being fixed at netlink creation. Preserve
existing entries when the D-Bus path matches, refreshing only ifindex,
and only call fetchLinkType on a genuinely new entry. A link torn down
and re-created at a different path still triggers a refetch.
Extract parseDescribeType from fetchLinkType so the JSON failure path —
malformed payload, missing Type field, wrong type for Type — can be
exercised without a live D-Bus connection. The classifier's fallback to
name-prefix heuristics already had coverage; this locks in that the seam
between Describe and the classifier surfaces an empty string on every
failure mode rather than misclassifying a link.