netdev - Re: [PATCH net-next] net ipv6: Prevent neighbor add if protocol is disabled on device

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Message-Id: <20190417.231920.1265352722825164065.davem@davemloft.net>
Date:   Wed, 17 Apr 2019 23:19:20 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...nel.org
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        dsahern@...il.com
Subject: Re: [PATCH net-next] net ipv6: Prevent neighbor add if protocol is
 disabled on device

From: David Ahern <dsahern@...nel.org>
Date: Tue, 16 Apr 2019 17:31:43 -0700

> From: David Ahern <dsahern@...il.com>
> 
> Disabling IPv6 on an interface removes existing entries but nothing prevents
> new entries from being manually added. To that end, add a new neigh_table
> operation, allow_add, that is called on RTM_NEWNEIGH to see if neighbor
> entries are allowed on a given device. If IPv6 is disabled on the device,
> allow_add returns false and passes a message back to the user via extack.
> 
>   $ echo 1 > /proc/sys/net/ipv6/conf/eth1/disable_ipv6
>   $ ip -6 neigh add fe80::4c88:bff:fe21:2704 dev eth1 lladdr de:ad:be:ef:01:01
>   Error: IPv6 is disabled on this device.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>

Also applied, thanks.