blob: 65e313bb792e204bc0dfffbfaa940b647e5565fb [file] [log] [blame]
From fb36cacba5d067ff045c7a6735161b23691b0c4f Mon Sep 17 00:00:00 2001
From: Yuki Taguchi <>
Date: Mon, 20 Jan 2020 13:48:37 +0900
Subject: [PATCH] ipv6: sr: remove SKB_GSO_IPXIP6 on End.D* actions
commit 62ebaeaedee7591c257543d040677a60e35c7aec upstream.
After LRO/GRO is applied, SRv6 encapsulated packets have
SKB_GSO_IPXIP6 feature flag, and this flag must be removed right after
decapulation procedure.
Currently, SKB_GSO_IPXIP6 flag is not removed on End.D* actions, which
creates inconsistent packet state, that is, a normal TCP/IP packets
have the SKB_GSO_IPXIP6 flag. This behavior can cause unexpected
fallback to GSO on routing to netdevices that do not support
SKB_GSO_IPXIP6. For example, on inter-VRF forwarding, decapsulated
packets separated into small packets by GSO because VRF devices do not
support TSO for packets with SKB_GSO_IPXIP6 flag, and this degrades
forwarding performance.
This patch removes encapsulation related GSO flags from the skb right
after the End.D* action is applied.
Fixes: d7a669dd2f8b ("ipv6: sr: add helper functions for seg6local")
Signed-off-by: Yuki Taguchi <>
Signed-off-by: David S. Miller <>
Signed-off-by: Paul Gortmaker <>
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 9d4f75e0d33a..af1091451316 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -23,6 +23,7 @@
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/dst_cache.h>
+#include <net/ip_tunnels.h>
#include <net/seg6_hmac.h>
@@ -130,7 +131,8 @@ static bool decap_and_validate(struct sk_buff *skb, int proto)
- skb->encapsulation = 0;
+ if (iptunnel_pull_offloads(skb))
+ return false;
return true;