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Date:	Wed, 19 Sep 2012 08:44:49 +0200
From:	Eric Dumazet <>
To:	Jamie Gloudon <>
Subject: [PATCH net-next] net: more accurate network taps in transmit path

From: Eric Dumazet <>

dev_queue_xmit_nit() should be called right before ndo_start_xmit()
calls or we might give wrong packet contents to taps users :

Packet checksum can be changed, or packet can be linearized or
segmented, and segments partially sent for the later case.

Also a memory allocation can fail and packet never really hit the
driver entry point.

Reported-by: Jamie Gloudon <>
Signed-off-by: Eric Dumazet <>
 net/core/dev.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index dcc673d..52cd1d7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2213,9 +2213,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
-		if (!list_empty(&ptype_all))
-			dev_queue_xmit_nit(skb, dev);
 		features = netif_skb_features(skb);
 		if (vlan_tx_tag_present(skb) &&
@@ -2250,6 +2247,9 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
+		if (!list_empty(&ptype_all))
+			dev_queue_xmit_nit(skb, dev);
 		skb_len = skb->len;
 		rc = ops->ndo_start_xmit(skb, dev);
 		trace_net_dev_xmit(skb, rc, dev, skb_len);
@@ -2272,6 +2272,9 @@ gso:
 		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
+		if (!list_empty(&ptype_all))
+			dev_queue_xmit_nit(nskb, dev);
 		skb_len = nskb->len;
 		rc = ops->ndo_start_xmit(nskb, dev);
 		trace_net_dev_xmit(nskb, rc, dev, skb_len);

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