netdev - [PATCH nf-next 06/14] netfilter: bridge: rename and resize 'data' field

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Date:	Wed,  1 Apr 2015 22:36:32 +0200
From:	Florian Westphal <fw@...len.de>
To:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Cc:	Florian Westphal <fw@...len.de>
Subject: [PATCH nf-next 06/14] netfilter: bridge: rename and resize 'data' field

Only user left is neigh resolution when DNAT is detected, to hold
the original source mac address (neigh resolution builds new mac header
using bridge mac).

Signed-off-by: Florian Westphal <fw@...len.de>
---
 include/linux/skbuff.h    | 2 +-
 net/bridge/br_netfilter.c | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index afa53e4..0991259 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -175,7 +175,7 @@ struct nf_bridge_info {
 	unsigned int		mask;
 	struct net_device	*physindev;
 	struct net_device	*physoutdev;
-	unsigned long		data[32 / sizeof(unsigned long)];
+	char			neigh_header[8];
 };
 #endif
 
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 02ccf38..947a2f6 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -329,7 +329,7 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
 			 */
 			skb_copy_from_linear_data_offset(skb,
 							 -(ETH_HLEN-ETH_ALEN),
-							 skb->nf_bridge->data,
+							 nf_bridge->neigh_header,
 							 ETH_HLEN-ETH_ALEN);
 			/* tell br_dev_xmit to continue with forwarding */
 			nf_bridge->mask |= BRNF_BRIDGED_DNAT;
@@ -991,8 +991,11 @@ static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
 	skb_pull(skb, ETH_HLEN);
 	nf_bridge->mask &= ~BRNF_BRIDGED_DNAT;
 
-	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
-				       skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
+	BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN));
+
+	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN),
+				       nf_bridge->neigh_header,
+				       ETH_HLEN - ETH_ALEN);
 	skb->dev = nf_bridge->physindev;
 	br_handle_frame_finish(skb);
 }
-- 
2.0.5

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