linux-kernel - Re: [patch v2.3 3/4] IPVS: make FTP work with full NAT support

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Message-ID: <4C3316F0.2030807@trash.net>
Date:	Tue, 06 Jul 2010 13:43:44 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Simon Horman <horms@...ge.net.au>
CC:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Malcolm Turnbull <malcolm@...dbalancer.org>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Julius Volz <julius.volz@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Hannes Eder <heder@...gle.com>
Subject: Re: [patch v2.3 3/4] IPVS: make FTP work with full NAT support

Simon Horman wrote:
> @@ -219,19 +358,23 @@ static int ip_vs_ftp_out(struct ip_vs_ap
>  
>  		buf_len = strlen(buf);
>  
> +		ct = nf_ct_get(skb, &ctinfo);
> +		ret = nf_nat_mangle_tcp_packet(skb,
> +					       ct,
> +					       ctinfo,
> +					       start-data,
> +					       end-start,
> +					       buf,
> +					       buf_len);
> +
> +		if (ct && ct != &nf_conntrack_untracked)
>   
This does not make sense, you're already using the conntrack above
in the call to nf_nat_mangle_tcp_packet(), so the check should
probably happen before that. You also should be checking the
return value of nf_nat_mangle_tcp_packet() before setting up the
expectation.

> +			ip_vs_expect_related(skb, ct, n_cp,
> +					     IPPROTO_TCP, NULL, 0);

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