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Differential D57266

rtnetlink: Fix weight overflow in RTA_MULTIPATH
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Authored by pouria on May 27 2026, 10:03 AM.
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melifaro
glebius
markj
emaste
bz
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network
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rG97f7b21dd525: rtnetlink: Fix weight overflow in RTA_MULTIPATH
Summary

If the weight value is larger than 8 bits, set it to the maximum.
Also, only send RTA_WEIGHT if its value is not the default.
This reduces message size and matches the behavior of
non-multipath routes.

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rG FreeBSD src repository
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Event Timeline

pouria created this revision.May 27 2026, 10:03 AM
Herald added a subscriber: imp. · View Herald TranscriptMay 27 2026, 10:03 AM
pouria requested review of this revision.May 27 2026, 10:03 AM
Harbormaster completed remote builds in B73471: Diff 178713.May 27 2026, 10:03 AM
emaste added inline comments.May 27 2026, 2:09 PM
sys/netlink/route/rt.c
220

Use MAX()?

pouria updated this revision to Diff 178733.May 27 2026, 2:15 PM

Address @emaste comment.

Harbormaster completed remote builds in B73481: Diff 178733.May 27 2026, 2:16 PM
markj added inline comments.May 27 2026, 3:54 PM
sys/netlink/route/rt.c
246

Doesn't this break backwards compatibility? Or is this code new enough that it doesn't matter?

pouria marked an inline comment as done.May 27 2026, 8:51 PM
pouria added inline comments.
sys/netlink/route/rt.c
246

This one is new.
I've added it in 84bb3648d2151 for backward compatibility with dump_rc_nhop. :D

emaste accepted this revision.May 27 2026, 9:21 PM

Oops, MIN of course.

This revision is now accepted and ready to land.May 27 2026, 9:21 PM
markj accepted this revision.May 28 2026, 3:27 PM
Closed by commit rG97f7b21dd525: rtnetlink: Fix weight overflow in RTA_MULTIPATH (authored by pouria). · Explain WhyMay 28 2026, 8:01 PM
This revision was automatically updated to reflect the committed changes.
pouria added a commit: rG97f7b21dd525: rtnetlink: Fix weight overflow in RTA_MULTIPATH.
pouria mentioned this in D56750: netlink: store osreldate of the process in the netlink pcb.May 29 2026, 9:36 PM

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PathSize
sys/
netlink/
route/
5 lines

Diff 178850

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sys/netlink/route/rt.c

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