Re: [PATCH 1/2] Traffic control cgroups subsystem

From: David Miller
Date: Wed Sep 10 2008 - 19:00:45 EST

From: "Ranjit Manomohan" <ranjitm@xxxxxxxxxx>
Date: Wed, 10 Sep 2008 15:56:55 -0700

> That is correct for ingress, for egress the sk is already available in
> the skb so should be fine.

That is not something you can rely upon, even for egress, %100 of the time.

Some forms of reallocation and mangling might decide to orphan the SKB
and thus drop the skb->sk reference before you see the packet. And they
are absolutely free to do this.

Just grep for skb_orphan().

Therefore, it is absolutely something you should not rely upon for
correct operation.

Like I said from the beginning, Thomas's approach is the superior one.
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