From: Xin Long <>

Upstream commit:
    commit 935a9749a36828af0e8be224a5cd4bc758112c34
    Author: Xin Long <>
    Date:   Sun Oct 1 22:00:53 2017 +0800

    ip_gre: get key from session_id correctly in erspan_rcv

    erspan only uses the first 10 bits of session_id as the key to look
    up the tunnel. But in erspan_rcv, it missed 'session_id & ID_MASK'
    when getting the key from session_id.

    If any other flag is also set in session_id in a packet, it would
    fail to find the tunnel due to incorrect key in erspan_rcv.

    This patch is to add 'session_id & ID_MASK' there and also remove
    the unnecessary variable session_id.

    Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
    Signed-off-by: Xin Long <>
    Signed-off-by: David S. Miller <>

Cc: Xin Long <>
Signed-off-by: Greg Rose <>
 datapath/linux/compat/ip_gre.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/datapath/linux/compat/ip_gre.c b/datapath/linux/compat/ip_gre.c
index 77d430e..1a8dc76 100644
--- a/datapath/linux/compat/ip_gre.c
+++ b/datapath/linux/compat/ip_gre.c
@@ -195,7 +195,6 @@ static int erspan_rcv(struct sk_buff *skb, struct 
tnl_ptk_info *tpi,
        struct ip_tunnel *tunnel;
        struct erspanhdr *ershdr;
        const struct iphdr *iph;
-       __be32 session_id;
        __be32 index;
        int len;

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