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[4.2.y-ckt,stable] Patch "net: Copy inner L3 and L4 headers as unaligned on GRE TEB" has been added to the 4.2.y-ckt tree

Message ID 1457390162-3569-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 7, 2016, 10:36 p.m. UTC
This is a note to let you know that I have just added a patch titled

    net: Copy inner L3 and L4 headers as unaligned on GRE TEB

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

From 7c5ef379a56a409cfc4c67c64f66f4bdf2fc1727 Mon Sep 17 00:00:00 2001
From: Alexander Duyck <aduyck@mirantis.com>
Date: Tue, 9 Feb 2016 06:14:43 -0800
Subject: net: Copy inner L3 and L4 headers as unaligned on GRE TEB

[ Upstream commit 78565208d73ca9b654fb9a6b142214d52eeedfd1 ]

This patch corrects the unaligned accesses seen on GRE TEB tunnels when
generating hash keys.  Specifically what this patch does is make it so that
we force the use of skb_copy_bits when the GRE inner headers will be
unaligned due to NET_IP_ALIGNED being a non-zero value.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/core/flow_dissector.c | 7 +++++++
 1 file changed, 7 insertions(+)

--
2.7.0
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Patch

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index bb98f8b..7b25277 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -381,6 +381,13 @@  ip_proto_again:
 				return false;
 			proto = eth->h_proto;
 			nhoff += sizeof(*eth);
+
+			/* Cap headers that we access via pointers at the
+			 * end of the Ethernet header as our maximum alignment
+			 * at that point is only 2 bytes.
+			 */
+			if (NET_IP_ALIGN)
+				hlen = nhoff;
 		}
 		goto again;
 	}