netdev - [PATCH 56/84] netfilter: only do skb_checksum_help on CHECKSUM_PARTIAL in ip

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Date:	Mon, 10 May 2010 22:18:27 +0200
From:	kaber@...sh.net
To:	davem@...emloft.net
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 56/84] netfilter: only do skb_checksum_help on CHECKSUM_PARTIAL in ip_queue

From: Herbert Xu <herbert@...dor.apana.org.au>

While doing yet another audit on ip_summed I noticed ip_queue
calling skb_checksum_help unnecessarily.  As we will set ip_summed
to CHECKSUM_NONE when necessary in ipq_mangle_ipv4, there is no
need to zap CHECKSUM_COMPLETE in ipq_build_packet_message.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
---
 net/ipv4/netfilter/ip_queue.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 2855f1f..d781513 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -160,8 +160,7 @@ ipq_build_packet_message(struct nf_queue_entry *entry, int *errp)
 		break;
 
 	case IPQ_COPY_PACKET:
-		if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
-		     entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
+		if (entry->skb->ip_summed == CHECKSUM_PARTIAL &&
 		    (*errp = skb_checksum_help(entry->skb))) {
 			read_unlock_bh(&queue_lock);
 			return NULL;
-- 
1.7.0.4

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