Re: [devel-ipsec] [PATCH RFC ipsec-next] pfkey: Deprecate pfkey

[Antony Antony <antony.antony@secunet.com>]

On Fri, Jul 04, 2025 at 08:55:14 +0200, Steffen Klassert via Devel wrote:
> The pfkey user configuration interface was replaced by the netlink
> user configuration interface more than a decade ago. In between
> all maintained IKE implementations moved to the netlink interface.
> So let 'config NET_KEY' default to no in Kconfig. The pfkey code
> will be removed in a second step.
> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Acked-by: Antony Antony <antony.antony@secunet.com>

I have tested libreswan and strongSwan CONFIG_NET_KEY=n; without HW offload.

And I would also like to get a confirmation Hardware offload, crypt
offload and packet offload works with CONFIG_NET_KEY n.

I undderstand this patch is independent of HW offload.

However, IMHO it is good to confirm now.  Otherwise I imagine
distributions will flip CONFIG_NET_KEY=y to get HW offload working,
which will make it harder to depreciate PF_KEY/NET_KEY

Paul or Leon - would you like to confirm with
CONFIG_NET_KEY=n XFRM HW offload still works?

-antony

> ---
>  net/xfrm/Kconfig | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
> index f0157702718f..aedea7a892db 100644
> --- a/net/xfrm/Kconfig
> +++ b/net/xfrm/Kconfig
> @@ -110,14 +110,17 @@ config XFRM_IPCOMP
>  	select CRYPTO_DEFLATE
>  
>  config NET_KEY
> -	tristate "PF_KEY sockets"
> +	tristate "PF_KEY sockets (deprecated)"
>  	select XFRM_ALGO
> +	default n
>  	help
>  	  PF_KEYv2 socket family, compatible to KAME ones.
> -	  They are required if you are going to use IPsec tools ported
> -	  from KAME.
>  
> -	  Say Y unless you know what you are doing.
> +	  The PF_KEYv2 socket interface is deprecated and
> +	  scheduled for removal. Please use the netlink
> +	  interface (XFRM_USER) to configure IPsec.
> +
> +	  If unsure, say N.
>  
>  config NET_KEY_MIGRATE
>  	bool "PF_KEY MIGRATE"
> -- 
> 2.43.0
> 
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