[PATCH 4.14 010/173] erspan: return PACKET_REJECT when the appropriate tunnel is not found

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>

[ Upstream commit 5a64506b5c2c3cdb29d817723205330378075448 ]

If erspan tunnel hasn't been established, we'd better send icmp port
unreachable message after receive erspan packets.

Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Cc: William Tu <u9012...@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
Acked-by: William Tu <u9012...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv4/ip_gre.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -322,6 +322,8 @@ static int erspan_rcv(struct sk_buff *sk
                ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
                return PACKET_RCVD;
        }
+       return PACKET_REJECT;
+
 drop:
        kfree_skb(skb);
        return PACKET_RCVD;