netdev - Re: [PATCH V2 net-next 1/3] ipv6: add the IPV6_FL_F_REFLECT flag to IPV6_FL_A

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Date:	Thu, 16 Jan 2014 13:45:18 +0100
From:	Florent Fourcot <florent.fourcot@...t-bretagne.fr>
To:	netdev@...r.kernel.org,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH V2 net-next 1/3] ipv6: add the IPV6_FL_F_REFLECT flag
 to IPV6_FL_A_GET


>> Was there a specific reason you did not use np->flow_label here and just
>> mirroring the flowlabel from the first packet of the connection for the
>> whole connection?
>>
>> I don't know if it makes a difference, but maybe it was done on purpose?
> 
> I thought about it and am actually in favor of reusing the flowid from the syn
> packet so userspace does report correct outgoing flowlabel even in case of
> strange tcp peer changing it mid-stream.
> 

Actually, the idea was that the remote could changed the flow label
during the lifetime of a connection.
I do not have a strong opinion on that, but in a "reflect" mode, I
except that the last received value will be in used.

Second, in case of SYN cookie, is the SYN flow label stored somewhere?

Thanks,

Florent.
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