netdev - [PATCH 2/7] netfilter: do not omit re-route check on NF

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Date:	Thu, 20 Jan 2011 21:22:41 +0100
From:	kaber@...sh.net
To:	davem@...emloft.net
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Florian Westphal <fw@...len.de>,
	Patrick McHardy <kaber@...sh.net>
Subject: [PATCH 2/7] netfilter: do not omit re-route check on NF_QUEUE verdict

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

ret != NF_QUEUE only works in the "--queue-num 0" case; for
queues > 0 the test should be '(ret & NF_VERDICT_MASK) != NF_QUEUE'.

However, NF_QUEUE no longer DROPs the skb unconditionally if queueing
fails (due to NF_VERDICT_FLAG_QUEUE_BYPASS verdict flag), so the
re-route test should also be performed if this flag is set in the
verdict.

The full test would then look something like

&& ((ret & NF_VERDICT_MASK) == NF_QUEUE && (ret & NF_VERDICT_FLAG_QUEUE_BYPASS))

This is rather ugly, so just remove the NF_QUEUE test altogether.

The only effect is that we might perform an unnecessary route lookup
in the NF_QUEUE case.

ip6table_mangle did not have such a check.

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
---
 net/ipv4/netfilter/iptable_mangle.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index 294a2a3..aef5d1f 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -60,7 +60,7 @@ ipt_mangle_out(struct sk_buff *skb, const struct net_device *out)
 	ret = ipt_do_table(skb, NF_INET_LOCAL_OUT, NULL, out,
 			   dev_net(out)->ipv4.iptable_mangle);
 	/* Reroute for ANY change. */
-	if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE) {
+	if (ret != NF_DROP && ret != NF_STOLEN) {
 		iph = ip_hdr(skb);
 
 		if (iph->saddr != saddr ||
-- 
1.7.3.4

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