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From:   Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
To:     "David S. Miller" <davem@davemloft.net>,
        Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Haishuang Yan <yanhaishuang@cmss.chinamobile.com>,
        William Tu <u9012063@gmail.com>
Subject: [PATCH 1/2] erspan: return PACKET_REJECT when the appropriate tunnel is not found
Date:   Mon, 10 Sep 2018 22:19:47 +0800
Message-Id: <1536589188-27550-1-git-send-email-yanhaishuang@cmss.chinamobile.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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 <u9012063@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
---
 net/ipv4/ip_gre.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index ae714ae..85a714d 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -328,6 +328,8 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 		ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 		return PACKET_RCVD;
 	}
+	return PACKET_REJECT;
+
 drop:
 	kfree_skb(skb);
 	return PACKET_RCVD;
-- 
1.8.3.1