netdev - net: evaluate net.ipvX.conf.all.* sysctls

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Message-Id: <20201107193515.1469030-1-vincent@bernat.ch>
Date:   Sat,  7 Nov 2020 20:35:12 +0100
From:   Vincent Bernat <vincent@...nat.ch>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: net: evaluate net.ipvX.conf.all.* sysctls

Some per-interface sysctls are ignoring the "all" variant. This
patchset fixes some of them when such a sysctl is handled as a
boolean. This includes:

 - net.ipvX.conf.all.disable_policy
 - net.ipvX.conf.all.disable_policy.disable_xfrm
 - net.ipv4.conf.all.proxy_arp_pvlan
 - net.ipvX.conf.all.ignore_routes_with_linkdown

Two sysctls are still ignoring the "all" variant as it wouldn't make
much sense for them:

 - net.ipv4.conf.all.tag
 - net.ipv4.conf.all.medium_id

Ideally, the "all" variant should be removed, but there is no simple
alternative to DEVINET_SYSCTL_* macros that would allow one to not
expose and "all" entry.