netdev - Re: [PATCH net-next v3] net/ipv6: Introduce accept_unsolicited_na knob to implement router-side changes for RFC9131

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Date:   Wed, 13 Apr 2022 14:22:09 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Arun Ajith S <aajith@...sta.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, dsahern@...nel.org,
        yoshfuji@...ux-ipv6.org, kuba@...nel.org, pabeni@...hat.com,
        corbet@....net, prestwoj@...il.com, gilligan@...sta.com,
        noureddine@...sta.com, gk@...sta.com
Subject: Re: [PATCH net-next v3] net/ipv6: Introduce accept_unsolicited_na
 knob to implement router-side changes for RFC9131


On 4/13/22 07:34, Arun Ajith S wrote:
> Add a new neighbour cache entry in STALE state for routers on receiving
> an unsolicited (gratuitous) neighbour advertisement with
> target link-layer-address option specified.
> This is similar to the arp_accept configuration for IPv4.
> A new sysctl endpoint is created to turn on this behaviour:
> /proc/sys/net/ipv6/conf/interface/accept_unsolicited_na.


Do we really need to expose this to /proc/sys, for every interface added 
in the host ?

/proc files creations/deletion cost a lot in environments 
adding/deleting netns very often.

I would prefer using NETLINK attributes, a single recvmsg() syscall can 
fetch/set hundreds of them.