Re: [PATCH] ipv6: check per-interface proxy_ndp in forwarding and NA paths

[Ido Schimmel]

On Fri, Sep 18, 2026 at 12:14:05PM -0300, Adriano Cordova wrote:
> proxy_ndp can be enabled per interface, with net.ipv6.conf.all.proxy_ndp
> as a global default. ndisc_recv_ns() checks both, but ip6_forward() and
> ndisc_recv_na() check only the global value. With the per-interface proxy
> ndp set and the global one left at 0, the router answers proxy NS but
> does not pass NDP messages to the proxied target.
> 
> Check both values at these two sites, as ndisc_recv_ns() already does.
> 
> Fixes: fbea49e1e240 ("[IPV6] NDISC: Add proxy_ndp sysctl.")
> Signed-off-by: Adriano Cordova <adrianox@xxxxxxxxx>

Do you have an actual use case for this? Changing a 20 years old user
visible behavior for the sole reason of removing a TODO comment is not
good practice.