From: Jakub Kicinski <kuba@kernel.org>
To: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Cc: Gabriel Goller <g.goller@proxmox.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
David Ahern <dsahern@kernel.org>,
netdev@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] ipv6: add `force_forwarding` sysctl to enable per-interface forwarding
Date: Wed, 2 Jul 2025 09:10:55 -0700 [thread overview]
Message-ID: <20250702091055.3d70a5ee@kernel.org> (raw)
In-Reply-To: <7c47cfb6-c1f1-42a1-8137-37f8f03fa970@6wind.com>
On Wed, 2 Jul 2025 17:14:42 +0200 Nicolas Dichtel wrote:
> > Should we invert the polarity? It appears that the condition below only
> > let's this setting _disable_ forwarding. IMO calling it "force" suggests
> > to the user that it will force it to be enabled.
> Not sure to follow you. When force_forwarding is set to 1 the forwarding is
> always enabled.
>
> sysctl | all.forwarding | iface.force_forwarding | packet processing from iface
> | 0 | 0 | no forward
> | 0 | 1 | forward
> | 1 | 0 | forward
> | 1 | 1 | forward
Ugh, I can't read comparisons to zero.
Let's switch to more sane logic:
if (idev && !READ_ONCE(idev->cnf.force_forwarding) &&
!READ_ONCE(net->ipv6.devconf_all->forwarding))
next prev parent reply other threads:[~2025-07-02 16:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-02 7:46 [PATCH v3] ipv6: add `force_forwarding` sysctl to enable per-interface forwarding Gabriel Goller
2025-07-02 10:05 ` Nicolas Dichtel
2025-07-02 22:26 ` Randy Dunlap
2025-07-03 6:58 ` Nicolas Dichtel
2025-07-04 4:09 ` Randy Dunlap
2025-07-03 11:04 ` Gabriel Goller
2025-07-03 14:04 ` Nicolas Dichtel
2025-07-03 14:50 ` Gabriel Goller
2025-07-02 14:34 ` Jakub Kicinski
2025-07-02 15:14 ` Nicolas Dichtel
2025-07-02 16:10 ` Jakub Kicinski [this message]
2025-07-02 16:17 ` Nicolas Dichtel
2025-07-03 11:05 ` Gabriel Goller
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