On Sun, May 31, 2026 at 10:24 PM Matthieu Baerts (NGI0)
<[email protected]> wrote:
>
> This sysctl is going to be used in the next commits to drop TCP
> timestamps option, to be able to send an ADD_ADDR with a v6 IP address
> and a port number. It is enabled by default.
>
> This knob is explicitly disabled in the MPTCP Join selftest, with the
> "signal addr list progresses after tx drop" subtest, to continue
> verifying the previous behaviour where the ADD_ADDR is not sent due to a
> lack of space.
>
> While at it, move syn_retrans_before_tcp_fallback down from struct
> mptcp_pernet, to avoid creating another 3 bytes hole.
>
> Reviewed-by: Mat Martineau <[email protected]>
> Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
...
> };
> @@ -94,6 +95,11 @@ const char *mptcp_get_scheduler(const struct net *net)
> return mptcp_get_pernet(net)->scheduler;
> }
>
> +unsigned int mptcp_add_addr_v6_port_drop_ts(const struct net *net)
> +{
> + return mptcp_get_pernet(net)->add_addr_v6_port_drop_ts;
> +}
Please use READ_ONCE() over sysctls.
This will avoid future patches from KCSAN bots.
