netdev - [PATCH 1/3] netfilter: ipvs: don't check for presence of nat extension

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Date:   Mon, 10 Apr 2017 09:58:33 -0700
From:   Simon Horman <horms@...ge.net.au>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org,
        Wensong Zhang <wensong@...ux-vs.org>,
        Julian Anastasov <ja@....bg>, Florian Westphal <fw@...len.de>
Subject: [PATCH 1/3] netfilter: ipvs: don't check for presence of nat extension

From: Florian Westphal <fw@...len.de>

Check for the NAT status bits, they are set once conntrack needs NAT in source or
reply direction, this is slightly faster than nfct_nat() as that has to check the
extension area.

Signed-off-by: Florian Westphal <fw@...len.de>
---
 net/netfilter/ipvs/ip_vs_ftp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index d30c327bb578..2e2bf7428cd1 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -260,7 +260,7 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
 		buf_len = strlen(buf);
 
 		ct = nf_ct_get(skb, &ctinfo);
-		if (ct && !nf_ct_is_untracked(ct) && nfct_nat(ct)) {
+		if (ct && !nf_ct_is_untracked(ct) && (ct->status & IPS_NAT_MASK)) {
 			/* If mangling fails this function will return 0
 			 * which will cause the packet to be dropped.
 			 * Mangling can only fail under memory pressure,
-- 
2.7.0.rc3.207.g0ac5344