netdev - RE: [PATCH net-next] net: Add TCP_FORCE

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Date:   Thu, 23 Apr 2020 08:52:35 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Cambda Zhu' <cambda@...ux.alibaba.com>,
        netdev <netdev@...r.kernel.org>
CC:     Dust Li <dust.li@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>
Subject: RE: [PATCH net-next] net: Add TCP_FORCE_LINGER2 to TCP setsockopt

From: Cambda Zhu
> Sent: 21 April 2020 13:18
> 
> This patch adds a new TCP socket option named TCP_FORCE_LINGER2. The
> option has same behavior as TCP_LINGER2, except the tp->linger2 value
> can be greater than sysctl_tcp_fin_timeout if the user_ns is capable
> with CAP_NET_ADMIN.

Did you consider adding an extra sysctl so that the limit
for TCP_LINGER2 could be greater than the default?

It might even be sensible to set the limit to a few times
the default.

All users can set the socket buffer sizes to twice the default.
Being able to do the same for the linger timeout wouldn't be a problem.

	David

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