netdev - Re: IPSec ESN: Packets decryption fail with ESN enabled connection

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Message-ID: <20190104083419.GG3581@gauss3.secunet.de>
Date:   Fri, 4 Jan 2019 09:34:19 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Harsh Jain <harsh@...lsio.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <netdev@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        <atul.gupta@...lsio.com>, <harshjain.prof@...il.com>
Subject: Re: IPSec ESN: Packets decryption fail with ESN enabled connection

On Thu, Jan 03, 2019 at 04:16:56PM +0530, Harsh Jain wrote:
> 
> On 02-01-2019 18:21, Herbert Xu wrote:
> > Does this occur if you use software crypto on the receiving end
> > while keeping the sending end unchanged?
> 
> I tried with "authencesn(hmac(sha1-ssse3),cbc(aes-asm))" on both sides.
> 
> Server : iperf  -s  -w 512k  -p 20002
> 
> Client : iperf  -t 60 -w 512k -l 2048 -c 1.0.0.96 -P 32 -p 20002
> 
> >
> > If not then I would start debugging this within your driver.
> 
> ESP Packet whose's sequence No. is out of window gets dropped with EBADMSG.  It seems that "xfrm_replay_seqhi" intentionally increments the "seq_hi" to fail verification for Out of seq packet.

Yes, this is defined in RFC 4303 Appendix A2.2.