Differential D58774

linuxulator: map IFF_LOWER_UP through NETLINK_ROUTE for Linux apps
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Authored by dteske on Aug 10 2026, 10:25 PM.

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Reviewers

adrian
glebius
kib
dchagin
emaste
pouria

Group Reviewers

network
Linux Emulation

Commits

rG34718e01869b: linuxulator: map IFF_LOWER_UP through NETLINK_ROUTE for Linux apps

Summary

rtnl_if_flags_to_linux() translated the usual IFF_* bits but dropped
FreeBSD's IFF_LOWER_UP (IFF_NETLINK_1). Chromium's AddressTrackerLinux
only treats a link as online when ifi_flags has UP|LOWER_UP|RUNNING; with
LOWER_UP missing, online_links stays empty, ConnectionType is
CONNECTION_NONE, and navigator.onLine is false even though TCP/HTTPS
work. Linux Chromium under the Linuxulator (e.g. www/linux-brave) then
shows a spurious Offline UI; sites that ignore navigator.onLine do not.
Native www/chromium is on a different notifier path.

Map IFF_LOWER_UP to Linux's IFF_LOWER_UP (1<<16) and define
LINUX_IFF_LOWER_UP alongside the existing LINUX_IFF_* constants.

PR: 297424

Test Plan

litmus (NETLINK_ROUTE + Chromium heuristic) before: OFFLINE
after rebuild+reload linux_common: LOWER_UP present, ONLINE
linux-brave: navigator.onLine true; Netflix Offline banner gone

Diff Detail

Repository

rG FreeBSD src repository

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Build Status

Buildable 75510
Build 72393: arc lint + arc unit

Event Timeline

dteske created this revision.Aug 10 2026, 10:25 PM

Herald added a subscriber: imp. · View Herald TranscriptAug 10 2026, 10:26 PM

dteske requested review of this revision.Aug 10 2026, 10:26 PM

Harbormaster completed remote builds in B75510: Diff 183840.Aug 10 2026, 10:26 PM

dteske edited the test plan for this revision. (Show Details)Aug 10 2026, 10:26 PM

dteske added reviewers: adrian, glebius, kib, emulation, network, dchagin.Aug 10 2026, 10:28 PM

adrian added inline comments.Aug 10 2026, 11:41 PM

sys/compat/linux/linux_netlink.c
346	do we need this comment? IFF_LOWER_UP -> LINUX_IFF_LOWER_UP seems sensible on its own.

dteske edited reviewers, added: Linux Emulation; removed: emulation.Aug 11 2026, 3:14 AM

Remove comment (adrian)

dteske marked an inline comment as done.Aug 11 2026, 3:25 AM

Harbormaster completed remote builds in B75514: Diff 183861.Aug 11 2026, 3:25 AM

dteske added a reviewer: emaste.Aug 11 2026, 4:59 AM

pouria accepted this revision.Aug 11 2026, 5:14 PM

This revision is now accepted and ready to land.Aug 11 2026, 5:14 PM

Closed by commit rG34718e01869b: linuxulator: map IFF_LOWER_UP through NETLINK_ROUTE for Linux apps (authored by dteske). · Explain WhyAug 11 2026, 5:32 PM

This revision was automatically updated to reflect the committed changes.

dteske added a commit: rG34718e01869b: linuxulator: map IFF_LOWER_UP through NETLINK_ROUTE for Linux apps.

Revision Contents
Changeset List

Path

Size

sys/

compat/

linux/

3 lines

linux_netlink.c

11 lines

Diff 183840

sys/compat/linux/linux.h

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sys/compat/linux/linux_netlink.c

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