From 7047ddb92115dab5603ab61c51730d9413e92980 Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Thu, 17 Jan 2013 18:43:41 +0100
Subject: [PATCH] --- yaml --- r: 351694 b: refs/heads/master c:
 d904d3edcbb26efc86ea3575bb4265559801a94b h: refs/heads/master v: v3

---
 [refs]                            | 2 +-
 trunk/include/uapi/linux/can/gw.h | 1 +
 trunk/net/can/gw.c                | 8 ++++++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index dd5b770c1255..c3084bd3bee6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 156c2bb9f88065c8da78814f98fde665a5cbb527
+refs/heads/master: d904d3edcbb26efc86ea3575bb4265559801a94b
diff --git a/trunk/include/uapi/linux/can/gw.h b/trunk/include/uapi/linux/can/gw.h
index 8e1db18c3cb6..0505c7f86213 100644
--- a/trunk/include/uapi/linux/can/gw.h
+++ b/trunk/include/uapi/linux/can/gw.h
@@ -51,6 +51,7 @@ enum {
 
 #define CGW_FLAGS_CAN_ECHO 0x01
 #define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
+#define CGW_FLAGS_CAN_IIF_TX_OK 0x04
 
 #define CGW_MOD_FUNCS 4 /* AND OR XOR SET */
 
diff --git a/trunk/net/can/gw.c b/trunk/net/can/gw.c
index 574dda78eb0f..37a3efb7cc9d 100644
--- a/trunk/net/can/gw.c
+++ b/trunk/net/can/gw.c
@@ -52,6 +52,7 @@
 #include <linux/skbuff.h>
 #include <linux/can.h>
 #include <linux/can/core.h>
+#include <linux/can/skb.h>
 #include <linux/can/gw.h>
 #include <net/rtnetlink.h>
 #include <net/net_namespace.h>
@@ -347,6 +348,13 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
 		return;
 	}
 
+	/* is sending the skb back to the incoming interface not allowed? */
+	if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
+	    skb_headroom(skb) == sizeof(struct can_skb_priv) &&
+	    (((struct can_skb_priv *)(skb->head))->ifindex ==
+	     gwj->dst.dev->ifindex))
+		return;
+
 	/*
 	 * clone the given skb, which has not been done in can_rcv()
 	 *