linux-kernel - [PATCH 3.14 04/47] packet: always probe for transport header

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Message-Id: <20160120215508.255299977@linuxfoundation.org>
Date:	Wed, 20 Jan 2016 14:00:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Daniel Borkmann <daniel@...earbox.net>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.14 04/47] packet: always probe for transport header

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Borkmann <daniel@...earbox.net>

[ Upstream commit 8fd6c80d9dd938ca338c70698533a7e304752846 ]

We concluded that the skb_probe_transport_header() should better be
called unconditionally. Avoiding the call into the flow dissector has
also not really much to do with the direct xmit mode.

While it seems that only virtio_net code makes use of GSO from non
RX/TX ring packet socket paths, we should probe for a transport header
nevertheless before they hit devices.

Reference: http://thread.gmane.org/gmane.linux.network/386173/
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/packet/af_packet.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2210,8 +2210,7 @@ static int tpacket_fill_skb(struct packe
 		len = ((to_write > len_max) ? len_max : to_write);
 	}
 
-	if (!packet_use_direct_xmit(po))
-		skb_probe_transport_header(skb, 0);
+	skb_probe_transport_header(skb, 0);
 
 	return tp_len;
 }
@@ -2538,8 +2537,8 @@ static int packet_snd(struct socket *soc
 		len += vnet_hdr_len;
 	}
 
-	if (!packet_use_direct_xmit(po))
-		skb_probe_transport_header(skb, reserve);
+	skb_probe_transport_header(skb, reserve);
+
 	if (unlikely(extra_len == 4))
 		skb->no_fcs = 1;