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

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Date:	Thu, 12 Jul 2012 22:43:22 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Pablo Neira Ayuso <pablo@...filter.org>
cc:	Simon Horman <horms@...ge.net.au>, 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


	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).

Regards

--
Julian Anastasov <ja@....bg>
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