erspan: fix error handling for erspan tunnel

[ Upstream commit 51dc63e3 ]

When processing icmp unreachable message for erspan tunnel, tunnel id
should be erspan_net_id instead of ipgre_net_id.

Fixes: 84e54fe0 ("gre: introduce native tunnel support for ERSPAN")
Cc: William Tu <u9012063@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/ipv4/ip_gre.c

@@ -177,6 +177,8 @@ static void ipgre_err(struct sk_buff *skb, u32 info,
 
 	if (tpi->proto == htons(ETH_P_TEB))
 		itn = net_generic(net, gre_tap_net_id);
+	else if (tpi->proto == htons(ETH_P_ERSPAN))
+		itn = net_generic(net, erspan_net_id);
 	else
 		itn = net_generic(net, ipgre_net_id);