netdev - Re: [PATCH iproute2 v3 1/1] macsec: Fix Macsec replay protection

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Date:   Wed, 11 Jan 2023 12:15:06 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     ehakim@...dia.com
Cc:     dsahern@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 v3 1/1] macsec: Fix Macsec replay protection

2023-01-11, 09:32:59 +0200, ehakim@...dia.com wrote:
> From: Emeel Hakim <ehakim@...dia.com>
> 
> Currently when configuring macsec with replay protection,
> replay protection and window gets a default value of -1,
> the above is leading to passing replay protection and
> replay window attributes to the kernel while replay is
> explicitly set to off, leading for an invalid argument
> error when configured with extended packet number (XPN).
> since the default window value which is 0xFFFFFFFF is
> passed to the kernel and while XPN is configured the above
> value is an invalid window value.
> 
> Example:
> ip link add link eth2 macsec0 type macsec sci 1 cipher
> gcm-aes-xpn-128 replay off
> 
> RTNETLINK answers: Invalid argument
> 
> Fix by passing the window attribute to the kernel only if replay is on
> 
> Fixes: b26fc590ce62 ("ip: add MACsec support")
> Signed-off-by: Emeel Hakim <ehakim@...dia.com>

Reviewed-by: Sabrina Dubroca <sd@...asysnail.net>

Thanks Emeel.

-- 
Sabrina