[PATCH 3.14 04/47] packet: always probe for transport header
From: Greg Kroah-Hartman
Date: Wed Jan 20 2016 - 17:14:42 EST
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;