linux-kernel - Re: [PATCH net-next v2] xfrm: introduce oseq-may-wrap flag

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Date:   Fri, 26 Jun 2020 07:24:54 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Petr Vaněk <pv@...ello.cz>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] xfrm: introduce oseq-may-wrap flag

On Sat, May 30, 2020 at 02:39:12PM +0200, Petr Vaněk wrote:
> RFC 4303 in section 3.3.3 suggests to disable anti-replay for manually
> distributed ICVs in which case the sender does not need to monitor or
> reset the counter. However, the sender still increments the counter and
> when it reaches the maximum value, the counter rolls over back to zero.
> 
> This patch introduces new extra_flag XFRM_SA_XFLAG_OSEQ_MAY_WRAP which
> allows sequence number to cycle in outbound packets if set. This flag is
> used only in legacy and bmp code, because esn should not be negotiated
> if anti-replay is disabled (see note in 3.3.3 section).
> 
> Signed-off-by: Petr Vaněk <pv@...ello.cz>

Now applied to ipsec-next, thanks a lot!