linux-kernel - Re: [PATCH] net/ipv4/ip_fragment:fix missing Flags reserved bit set in iphdr

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Message-ID: <20210507155900.43cd8200@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 7 May 2021 15:59:00 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     meijusan <meijusan@....com>
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/ipv4/ip_fragment:fix missing Flags reserved bit set
 in iphdr

On Thu,  6 May 2021 22:59:05 +0800 meijusan wrote:
> ip frag with the iphdr flags reserved bit set,via router,ip frag reasm or
> fragment,causing the reserved bit is reset to zero.
> 
> Keep reserved bit set is not modified in ip frag  defrag or fragment.
> 
> Signed-off-by: meijusan <meijusan@....com>

Could you please provide more background on why we'd want to do this?
Preferably with references to relevant (non-April Fools' Day) RFCs.