Patch "ipip: Properly mark ipip GRO packets as encapsulated." has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    ipip: Properly mark ipip GRO packets as encapsulated.

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ipip-properly-mark-ipip-gro-packets-as-encapsulated.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b8cba75bdf6a48ea4811bbefb11a94a5c7281b68 Mon Sep 17 00:00:00 2001
From: Jesse Gross <jesse@kernel.org>
Date: Sat, 19 Mar 2016 09:32:00 -0700
Subject: ipip: Properly mark ipip GRO packets as encapsulated.

From: Jesse Gross <jesse@kernel.org>

commit b8cba75bdf6a48ea4811bbefb11a94a5c7281b68 upstream.

ipip encapsulated packets can be merged together by GRO but the result
does not have the proper GSO type set or even marked as being
encapsulated at all. Later retransmission of these packets will likely
fail if the device does not support ipip offloads. This is similar to
the issue resolved in IPv6 sit in feec0cb3
("ipv6: gro: support sit protocol").

Reported-by: Patrick Boutilier <boutilpj@ednet.ns.ca>
Fixes: 9667e9bb ("ipip: Add gro callbacks to ipip offload")
Tested-by: Patrick Boutilier <boutilpj@ednet.ns.ca>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jesse Gross <jesse@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Juerg Haefliger <juerg.haefliger@hpe.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/ipv4/af_inet.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1425,6 +1425,13 @@ out_unlock:
 	return err;
 }
 
+static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
+{
+	skb->encapsulation = 1;
+	skb_shinfo(skb)->gso_type |= SKB_GSO_IPIP;
+	return inet_gro_complete(skb, nhoff);
+}
+
 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
 			 unsigned short type, unsigned char protocol,
 			 struct net *net)
@@ -1653,7 +1660,7 @@ static const struct net_offload ipip_off
 	.callbacks = {
 		.gso_segment	= inet_gso_segment,
 		.gro_receive	= inet_gro_receive,
-		.gro_complete	= inet_gro_complete,
+		.gro_complete	= ipip_gro_complete,
 	},
 };
 


Patches currently in stable-queue which might be from jesse@kernel.org are

queue-4.4/tunnels-remove-encapsulation-offloads-on-decap.patch
queue-4.4/tunnels-don-t-apply-gro-to-multiple-layers-of-encapsulation.patch
queue-4.4/ipip-properly-mark-ipip-gro-packets-as-encapsulated.patch