From: Jesse Gross <jesse@kernel.org>
Date: Sat, 19 Mar 2016 16:32:01 +0000 (-0700)
Subject: tunnels: Don't apply GRO to multiple layers of encapsulation.
X-Git-Tag: v3.16.35~88
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=23cca87ff225c1c7327a715db1bcc98a241b0efa;p=thirdparty%2Fkernel%2Fstable.git

tunnels: Don't apply GRO to multiple layers of encapsulation.

commit fac8e0f579695a3ecbc4d3cac369139d7f819971 upstream.

When drivers express support for TSO of encapsulated packets, they
only mean that they can do it for one layer of encapsulation.
Supporting additional levels would mean updating, at a minimum,
more IP length fields and they are unaware of this.

No encapsulation device expresses support for handling offloaded
encapsulated packets, so we won't generate these types of frames
in the transmit path. However, GRO doesn't have a check for
multiple levels of encapsulation and will attempt to build them.

UDP tunnel GRO actually does prevent this situation but it only
handles multiple UDP tunnels stacked on top of each other. This
generalizes that solution to prevent any kind of tunnel stacking
that would cause problems.

Fixes: bf5a755f ("net-gre-gro: Add GRE support to the GRO stack")
Signed-off-by: Jesse Gross <jesse@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.16:
 - Drop the ipip and sit cases
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ab4ce78c5bb85..b3404718fda18 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1759,8 +1759,8 @@ struct napi_gro_cb {
 	/* Used in ipv6_gro_receive() */
 	u16	proto;
 
-	/* Used in udp_gro_receive */
-	u16	udp_mark;
+	/* Used in tunnel GRO receive */
+	u16	encap_mark;
 
 	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
 	__wsum	csum;
diff --git a/net/core/dev.c b/net/core/dev.c
index e12823e68bb07..75be7e2262687 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3974,7 +3974,7 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 		NAPI_GRO_CB(skb)->same_flow = 0;
 		NAPI_GRO_CB(skb)->flush = 0;
 		NAPI_GRO_CB(skb)->free = 0;
-		NAPI_GRO_CB(skb)->udp_mark = 0;
+		NAPI_GRO_CB(skb)->encap_mark = 0;
 
 		pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
 		break;
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 85c84f487d595..7ff682f7e1c36 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -154,6 +154,11 @@ static struct sk_buff **gre_gro_receive(struct sk_buff **head,
 	struct packet_offload *ptype;
 	__be16 type;
 
+	if (NAPI_GRO_CB(skb)->encap_mark)
+		goto out;
+
+	NAPI_GRO_CB(skb)->encap_mark = 1;
+
 	off = skb_gro_offset(skb);
 	hlen = off + sizeof(*greh);
 	greh = skb_gro_header_fast(skb, off);
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 546d2d439dda6..ca41bcbea39c3 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -160,12 +160,12 @@ static struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *s
 	unsigned int hlen, off;
 	int flush = 1;
 
-	if (NAPI_GRO_CB(skb)->udp_mark ||
+	if (NAPI_GRO_CB(skb)->encap_mark ||
 	    (!skb->encapsulation && skb->ip_summed != CHECKSUM_COMPLETE))
 		goto out;
 
-	/* mark that this skb passed once through the udp gro layer */
-	NAPI_GRO_CB(skb)->udp_mark = 1;
+	/* mark that this skb passed once through the tunnel gro layer */
+	NAPI_GRO_CB(skb)->encap_mark = 1;
 
 	off  = skb_gro_offset(skb);
 	hlen = off + sizeof(*uh);