netdev - Re: [PATCH 1/2] ipvs: ip_vs_ftp depends on nf_conntrack

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Message-ID: <20120723064818.GK6603@verge.net.au>
Date:	Mon, 23 Jul 2012 15:48:18 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julian Anastasov <ja@....bg>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>, lvs-devel@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Hans Schillstrom <hans.schillstrom@...csson.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH 1/2] ipvs: ip_vs_ftp depends on nf_conntrack_ftp helper

On Thu, Jul 12, 2012 at 10:43:22PM +0300, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Thu, 12 Jul 2012, Pablo Neira Ayuso wrote:
> 
> > On Wed, Jul 11, 2012 at 09:25:26AM +0900, Simon Horman wrote:
> > > From: Julian Anastasov <ja@....bg>
> > > 
> > > 	The FTP application indirectly depends on the
> > > nf_conntrack_ftp helper for proper NAT support. If the
> > > module is not loaded, IPVS can resize the packets for the
> > > command connection, eg. PASV response but the SEQ adjustment
> > > logic in ipv4_confirm is not called without helper.
> > > 
> > > Signed-off-by: Julian Anastasov <ja@....bg>
> > > Signed-off-by: Simon Horman <horms@...ge.net.au>
> > > ---
> > >  net/netfilter/ipvs/Kconfig | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/net/netfilter/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
> > > index f987138..8b2cffd 100644
> > > --- a/net/netfilter/ipvs/Kconfig
> > > +++ b/net/netfilter/ipvs/Kconfig
> > > @@ -250,7 +250,8 @@ comment 'IPVS application helper'
> > >  
> > >  config	IP_VS_FTP
> > >    	tristate "FTP protocol helper"
> > > -        depends on IP_VS_PROTO_TCP && NF_CONNTRACK && NF_NAT
> > > +	depends on IP_VS_PROTO_TCP && NF_CONNTRACK && NF_NAT && \
> > > +		NF_CONNTRACK_FTP
> > 
> > If you require FTP NAT support, then this depends on NF_NAT_FTP
> > instead of NF_CONNTRACK_FTP.
> 
> 	No, I just checked again, it works without nf_nat_ftp,
> only nf_nat, nf_conntrack_ftp and iptable_nat are needed.
> We use packet mangling part from nf_nat (nf_nat_mangle_tcp_packet).

Is there a consensus on this?
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