netdev - Re: Increasing skb->mark size

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Message-ID: <CAKD1Yr3URKzAooiNH7i4kHVR0-TQjEAkQEdqjarAm6uxH7u-Mw@mail.gmail.com>
Date:	Sun, 29 Nov 2015 17:37:11 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Matt Bennett <Matt.Bennett@...iedtelesis.co.nz>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Luuk Paulussen <Luuk.Paulussen@...iedtelesis.co.nz>
Subject: Re: Increasing skb->mark size

On Wed, Nov 25, 2015 at 5:32 AM, Matt Bennett
<Matt.Bennett@...iedtelesis.co.nz> wrote:
> I'm emailing this list for feedback on the feasibility of increasing
> skb->mark or adding a new field for marking. Perhaps this extension
> could be done under a new CONFIG option.

64-bit marks (both skb->mark and sk->sk_mark) would be useful for
hosts doing complex policy routing as well. Current Android releases
use 20 of the 32 bits. If the mark were 64 bits, we could put the UID
in it, and stop using ip rules to implement per-UID routing.
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