4.15-stable review patch. If anyone has any objections, please let me know.
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From: Haishuang Yan yanhaishuang@cmss.chinamobile.com
[ Upstream commit dd8d5b8c5b22e31079b259b8bfb686f1fac1080a ]
When erspan_rcv call return PACKET_REJECT, we shoudn't call ipgre_rcv to process packets again, instead send icmp unreachable message in error path.
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN") Acked-by: William Tu u9012063@gmail.com Cc: William Tu u9012063@gmail.com Signed-off-by: Haishuang Yan yanhaishuang@cmss.chinamobile.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@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 @@ -408,11 +408,13 @@ static int gre_rcv(struct sk_buff *skb) if (unlikely(tpi.proto == htons(ETH_P_ERSPAN))) { if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) return 0; + goto out; }
if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) return 0;
+out: icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); drop: kfree_skb(skb);