netdev - Re: [PATCH] [IPVS] transparent proxying

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Message-ID: <20061129144620.GA5978@verge.net.au>
Date:	Wed, 29 Nov 2006 23:46:22 +0900
From:	Horms <horms@...ge.net.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Julian Anastasov <ja@....bg>,
	Wensong Zhan <wensong@...ux-vs.org>,
	Joseph Mack NA3T <jmack@...d.net>,
	Jinhua Luo <home_king@....com>
Subject: Re: [PATCH] [IPVS] transparent proxying

On Wed, Nov 29, 2006 at 03:15:23PM +0100, Thomas Graf wrote:
> * Horms <horms@...ge.net.au> 2006-11-29 15:21
> > This seems to be a pretty clean solution to a real problem.
> > 
> > Ultimately I would like to see IPVS move into the forward chain.
> > This seems to be a nice way to explore that, without breaking
> > any existing setups.
> > 
> > -- 
> > Horms
> >   H: http://www.vergenet.net/~horms/
> >   W: http://www.valinux.co.jp/en/
> > 
> > [IPVS] transparent proxying
> > 
> > Patch from Jinhua Luo <home_king@....com> to allow a web cluseter using
> > transparent proxying. It works by simply grabing packets that have the
> > fwmark set and have not already been processed by ipvs (ip_vs_out) and
> > throwing them into ip_vs_in.
> > 
> > See: http://archive.linuxvirtualserver.org/html/lvs-users/2006-11/msg00261.html
> > 
> > Normally LVS packets are processed by ip_vs_in fron on the INPUT chain,
> > and packets that are processed in this way never show up on the FORWARD
> > chain, so they won't hit this rule.
> > 
> > This patch seems like a good precursor to moving LVS permanantly to
> > the FORWARD chain. As I'm struggling to think how it could break things.
> > 
> > The changes to the original patch are:
> > 
> > * Reformated to use tabs for indentation (instead of 4 spaces)
> > * Reformated to be < 80 columns wide
> > * Added some comments
> > * Rewrote description (this text)
> > 
> > Signed-off-by: Simon Horman <horms@...ge.net.au>
> > Signed-off-by: Jinhua Luo <home_king@....com>
> > 
> > Index: linux-2.6/net/ipv4/ipvs/ip_vs_core.c
> > ===================================================================
> > --- linux-2.6.orig/net/ipv4/ipvs/ip_vs_core.c	2006-11-28 15:30:00.000000000 +0900
> > +++ linux-2.6/net/ipv4/ipvs/ip_vs_core.c	2006-11-29 10:27:49.000000000 +0900
> > @@ -23,7 +23,9 @@
> >   * Changes:
> >   *	Paul `Rusty' Russell		properly handle non-linear skbs
> >   *	Harald Welte			don't use nfcache
> > - *
> > + *	Jinhua Luo                      redirect packets with fwmark on
> > + *					NF_IP_FORWARD chain to ip_vs_in(),
> > + *					mainly for transparent cache cluster
> >   */
> >  
> >  #include <linux/module.h>
> > @@ -1070,6 +1072,26 @@
> >  	return ip_vs_in_icmp(pskb, &r, hooknum);
> >  }
> >  
> > +/*
> > + * 	This is hooked into the NF_IP_FORWARD. It catches
> > + * 	packets that have not already been handled by ipvs (out)
> > + * 	and have a fwmark set. This is to allow transparent proxying
> > + * 	of fwmark virtual services.
> > + *
> > + * 	It will not process packets that are handled by ipvs (in)
> > + * 	as they never traverse the NF_IP_FORWARD.
> > + */
> > +static unsigned int
> > +ip_vs_forward_with_fwmark(unsigned int hooknum, struct sk_buff **pskb,
> > +			  const struct net_device *in,
> > +			  const struct net_device *out,
> > +			  int (*okfn)(struct sk_buff *))
> > +{
> > +	if ((*pskb)->ipvs_property || ! (*pskb)->nfmark)
> > +		return NF_ACCEPT;
> 
> This patch seems to be based on an old tree, I've renamed nfmark
> to mark in net-2.6.20. The term fwmark and nfmark shouldn't be
> used anymore.

Sorry, I based this patch on Linus's tree. I'll port it to net-2.6.20.

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/

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