netdev - Re: [PATCH net] ip: make IP identifiers less predictable

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Message-ID: <1406313497.3363.98.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 25 Jul 2014 20:38:17 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeffrey Knockel <jeffk@...unm.edu>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"Jedidiah R. Crandall" <crandall@...unm.edu>,
	Willy Tarreau <w@....eu>,
	"security@...nel.org" <security@...nel.org>
Subject: Re: [PATCH net] ip: make IP identifiers less predictable

On Fri, 2014-07-25 at 11:35 -0700, Linus Torvalds wrote:
> On Fri, Jul 25, 2014 at 11:09 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > We might change the hash to use both daddr & saddr to increase
> > protection.
> 
> .. and maybe protocol too, so that you can't easily use icmp echo
> packets to do it for udp packets etc. The underlying jhash is
> jhash_3words(), so that would actually be fairly natural for at least
> ipv4 (the ipv6 case I didn't look at).

Right, in fact saddr is probably not worth it.

Its not like servers have dozen of IPv4 addresses anyway...



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