netdev - Re: [PATCH] tcp: make urg+gso work for real this time

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Date:	Wed, 17 Dec 2008 18:30:15 +0300
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Petr Tesarik <ptesarik@...e.cz>,
	Ilpo J??rvinen <ilpo.jarvinen@...sinki.fi>,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: make urg+gso work for real this time

Hello!

> Probably, netbsd/openbsd have some another quirk to work this around.
> I do not see how, though.

F.e. this could be totally safe if we do this only in the case
when octet seq+0xFFFF has not yet been sent.

When we send segment with 0xFFFF inside urg_ptr is advanced and so on,
so that receiver has no chances to corrupt stream.

I.e. we set URG and urg_ptr to fake scb->seq + 0xFFFF only when:

	after(scb->seq + 0xFFFF, tp->snd_nxt)

My brains are rusty, so take this critically. :-)

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