netdev - Re: [PATCH ipsec-next v3] xfrm: rate limit SA mapping change message to user space

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Date:   Wed, 29 Dec 2021 11:19:45 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Antony Antony <antony.antony@...unet.com>
CC:     Thomas Egerer <thomas.egerer@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH ipsec-next v3] xfrm: rate limit SA mapping change message
 to user space

On Wed, Dec 22, 2021 at 02:11:18PM +0100, Antony Antony wrote:
> Kernel generates mapping change message, XFRM_MSG_MAPPING,
> when a source port chage is detected on a input state with UDP
> encapsulation set.  Kernel generates a message for each IPsec packet
> with new source port.  For a high speed flow per packet mapping change
> message can be excessive, and can overload the user space listener.
> 
> Introduce rate limiting for XFRM_MSG_MAPPING message to the user space.
> 
> The rate limiting is configurable via netlink, when adding a new SA or
> updating it. Use the new attribute XFRMA_MTIMER_THRESH in seconds.
> 
> v1->v2 change:
> 	update xfrm_sa_len()
> 
> v2->v3 changes:
> 	use u32 insted unsigned long to reduce size of struct xfrm_state
> 	fix xfrm_ompat size Reported-by: kernel test robot <lkp@...el.com>
> 	accept XFRM_MSG_MAPPING only when XFRMA_ENCAP is present
> 
> Co-developed-by: Thomas Egerer <thomas.egerer@...unet.com>
> Signed-off-by: Thomas Egerer <thomas.egerer@...unet.com>
> Signed-off-by: Antony Antony <antony.antony@...unet.com>

Applied, thanks a lot!