Subject: Re: [PATCH net-next v2 0/4] ipv6: Disable IPv6 Destination Options RX processing by default

From: Jakub Kicinski <[email-masked]>
Date: Fri, 9 Jan 2026 11:50:15 -0800

On Thu,  8 Jan 2026 09:14:52 -0800 Tom Herbert wrote:
> This patchset set changes the interpretation of the Destination Options
> and Hop-by-Hop Options sysctl limits, net.ipv6.max_dst_opts_number and
> net.ipv6.max_dst_opts_number to mean that when the sysctl is zero
> processing of the associated extension header is disabled such that
> packets received with the extension header are dropped.

Hi Tom!

Unfortunately, this breaks GRE:
https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2026-01-09--18-00&pw-n=0&pass=0