netdev - Re: [PATCHv2 net] {pktgen, xfrm} Update IPv4 header total len and checksum after tranformation

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Date:	Sun, 01 Dec 2013 20:35:17 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	fan.du@...driver.com
Cc:	steffen.klassert@...unet.com, netdev@...r.kernel.org
Subject: Re: [PATCHv2 net] {pktgen, xfrm} Update IPv4 header total len and
 checksum after tranformation

From: Fan Du <fan.du@...driver.com>
Date: Sun, 1 Dec 2013 16:28:48 +0800

> commit a553e4a6317b2cfc7659542c10fe43184ffe53da ("[PKTGEN]: IPSEC support")
> tried to support IPsec ESP transport transformation for pktgen, but acctually
> this doesn't work at all for two reasons(The orignal transformed packet has
> bad IPv4 checksum value, as well as wrong auth value, reported by wireshark)
> 
> - After transpormation, IPv4 header total length needs update,
>   because encrypted payload's length is NOT same as that of plain text.
> 
> - After transformation, IPv4 checksum needs re-caculate because of payload
>   has been changed.
> 
> With this patch, armmed pktgen with below cofiguration, Wireshark is able to
> decrypted ESP packet generated by pktgen without any IPv4 checksum error or
> auth value error.
> 
> pgset "flag IPSEC"
> pgset "flows 1"
> 
> Signed-off-by: Fan Du <fan.du@...driver.com>

Applied and queued up for -stable, thanks.
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