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Differential D55448

rtadvd: set route info lifetime to 0 during shutdown
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Authored by pouria on Feb 22 2026, 8:31 PM.

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bz

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rG4dc6522d57c7: rtadvd(8): Set route info lifetime to 0 during shutdown

Summary

RFC 4191 section 3.1: If the received route's lifetime
is zero, the route is removed from the Routing Table if present.

Therefore, tell hosts that those routes are not available anymore.
setting Router lifetime field to 0 is not enough since route info
directly consults routing table for nexthop and its not depends on
defrouter list.
Also, do not tell route information option is unknown.

Test Plan

configure a rtprefix option in rtadvd.conf,
then run:

rtadvd -sfDc /etc/rtadvd.conf -M vtnet0

followed by CTRL-C for graceful shutdown.
Since FreeBSD doesn't support RFC 4191 yet (I'm working on it)
verify functionality with tcpdump.

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rG FreeBSD src repository

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Event Timeline

pouria created this revision.Feb 22 2026, 8:31 PM

Herald added a subscriber: imp. · View Herald TranscriptFeb 22 2026, 8:31 PM

pouria requested review of this revision.Feb 22 2026, 8:31 PM

It also resolves one of the issues in PR263982.

fix missed skip.

Harbormaster completed remote builds in B70910: Diff 172498.Feb 23 2026, 10:43 AM

pouria mentioned this in D54636: rtadvd: add multi pref64 support.Feb 25 2026, 11:01 AM

bms added a subscriber: bms.Feb 25 2026, 11:10 AM

Rebase to main and resolve conflict

Harbormaster completed remote builds in B71353: Diff 173590.Mar 11 2026, 9:00 PM

pouria added a reviewer: bz.Tue, Mar 31, 10:18 PM

markj accepted this revision.Wed, Apr 1, 12:18 PM

This revision is now accepted and ready to land.Wed, Apr 1, 12:18 PM

pouria added a parent revision: D55449: nd6: Add support for route information (RFC 4191).Wed, Apr 1, 1:34 PM

pouria mentioned this in D55449: nd6: Add support for route information (RFC 4191).Thu, Apr 16, 6:27 PM

Closed by commit rG4dc6522d57c7: rtadvd(8): Set route info lifetime to 0 during shutdown (authored by pouria). · Explain WhyThu, Apr 16, 7:38 PM

This revision was automatically updated to reflect the committed changes.

pouria added a commit: rG4dc6522d57c7: rtadvd(8): Set route info lifetime to 0 during shutdown.

Revision Contents
Changeset List

Path

Size

usr.sbin/

rtadvd/

3 lines

17 lines

Diff 175694

usr.sbin/rtadvd/config.c

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usr.sbin/rtadvd/rtadvd.c

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