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Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Simon Horman" , "Randy Dunlap" , , "Arun Ajith S" , "Roopa Prabhu" , "Jaehee Park" , "Jonathan Corbet" , "Shuah Khan" , "Shuah Khan" , , , , "Alexander Aring" , , Subject: Re: [PATCH net-next v2 1/2] ipv6: update NUD_FAILED neighbors from NA messages From: "Lawrence Lee" To: "Ido Schimmel" X-Mailer: aerc 0.17.0 References: <6596966f734f3d416bfa83722f7a595149bcc3f8.1789448374.git.lfqlee314@gmail.com> <20260916120202.GA935660@shredder> <20260917143750.GA1332286@shredder> In-Reply-To: <20260917143750.GA1332286@shredder> On Thu Sep 17, 2026 at 2:37 PM UTC, Ido Schimmel wrote: > On Wed, Sep 16, 2026 at 05:43:11PM +0000, Lawrence Lee wrote: > > I added the lowpan changes after my local Sashiko review run=20 > > identified an issue where a FAILED neighbor can retain an outdated=20 > > private short address if it's moved to STALE by a non-override NA.=20 > > Happy to drop all lowpan-related changes or update comments/commit=20 > > message to reflect the changes, please let me know your preference. > > And if the entry is INCOMPLETE and we get a non-override NA? > lowpan_ndisc_update() will ignore it. It's a pre-existing issue and > there is a TODO comment about this: > > "/* react on overrides only. TODO check if this is really right. */" > > You can mention that it's a pre-existing issue under the '---'. That > way, hopefully, Sashiko will not flag it and it won't clutter the git > log. > > > This was added in response to another Sashiko local review finding. =20 > > Let's say we have some FAILED neighbor T with NTF_ROUTER set. If we=20 > > get an NA from source address S with target address T and with the=20 > > Router bit clear, existing kernel code will cleanup routes with=20 > > gateway S, but IMO we should clean routes with gateway T instead=20 > > since that is the neighbor which was updated by the NA. I can either=20 > > update comments/commit message to reflect this or remove the change=20 > > entirely, please let me know your preference. > > And if the neighbour was in a different state than FAILED? It seems like > another pre-existing issue. I guess that in practice, most of the time, > the source address of the NA is also the target address in the payload. > You can mention this under the '---'. I will remove both of these changes, add comments below the '---' as=20 suggested, and resubmit.