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Differential D55141

ndp: implement delayed anycast and proxy NA
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Authored by pouria on Feb 6 2026, 8:43 AM.
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ae
bms
imp
melifaro

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glebius
zlei
madpilot
bz
markj
bms
Group Reviewers
network
Commits
rGf37fbe30f559: ndp: implement delayed anycast and proxy NA
Summary

the following items are implemented:

  • proxy advertisement delay rule (RFC4861 7.2.8, last paragraph, SHOULD)
  • anycast advertisement delay rule (RFC4861 7.2.7, SHOULD)
Test Plan

set an anycast address on host A

ifconfig vtnet0 inet6 3fff::1 anycast

ping it from host B

ping -c2 3fff::1

your first response must have a random delay between 0 and 1 seconds.
repeat this process by removing the ndp cache from host B and you must see a
different response time.

ndp -d 3fff::1
ping -c2 3fff::1

Diff Detail

Repository
rG FreeBSD src repository
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Tests Not Applicable

Event Timeline

pouria created this revision.Feb 6 2026, 8:43 AM
Herald added subscribers: melifaro, ae, imp. · View Herald TranscriptFeb 6 2026, 8:43 AM
pouria requested review of this revision.Feb 6 2026, 8:43 AM
Harbormaster completed remote builds in B70465: Diff 171321.Feb 6 2026, 8:43 AM
pouria added a parent revision: D55015: ndp: Add support for Gratuitous Neighbor Discovery (GRAND).Feb 6 2026, 8:44 AM
pouria updated this revision to Diff 171711.Feb 10 2026, 10:33 PM

Update by rebase to main. follow update by parent revision.

Harbormaster completed remote builds in B70611: Diff 171711.Feb 10 2026, 10:33 PM
pouria added a reviewer: markj.Feb 12 2026, 6:03 PM
bms added a subscriber: bms.Feb 23 2026, 9:14 PM
pouria added a comment.Thu, Mar 5, 6:18 PM

@glebius this revision is an extention of GRAND which only affects anycast and proxy ipv6 addresses.
Could you please review it c-wise?

bms added inline comments.Mon, Mar 9, 4:58 PM
sys/netinet6/nd6_nbr.c
1808

You got 6 and 9 reversed here I think; you probably meant RFC 4861.

pouria updated this revision to Diff 173441.Mon, Mar 9, 5:03 PM

Address @bms comments.
Thank you!

Harbormaster completed remote builds in B71292: Diff 173441.Mon, Mar 9, 5:03 PM
pouria added a reviewer: bms.Mon, Mar 9, 5:05 PM
bms added a comment.Mon, Mar 9, 5:28 PM

LGTM

pouria updated this revision to Diff 173445.Mon, Mar 9, 6:12 PM

Rebase to main and resolve conflicts

Harbormaster completed remote builds in B71295: Diff 173445.Mon, Mar 9, 6:12 PM
This revision was not accepted when it landed; it landed in state Needs Review.Mon, Mar 9, 7:06 PM
Closed by commit rGf37fbe30f559: ndp: implement delayed anycast and proxy NA (authored by pouria). · Explain Why
This revision was automatically updated to reflect the committed changes.
pouria added a commit: rGf37fbe30f559: ndp: implement delayed anycast and proxy NA.

Revision Contents
Changeset List

PathSize
sys/
netinet6/
3 lines
78 lines

Diff 173447

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sys/netinet6/nd6.h

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sys/netinet6/nd6_nbr.c

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