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

[Eric Dumazet]

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.