From dd8d5b8c5b22e31079b259b8bfb686f1fac1080a Mon Sep 17 00:00:00 2001 From: Haishuang Yan Date: Wed, 20 Dec 2017 10:21:46 +0800 Subject: [PATCH] ip_gre: fix error path when erspan_rcv failed 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 Cc: William Tu Signed-off-by: Haishuang Yan Signed-off-by: David S. Miller --- 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 fd4d6e96da7e..5c36b6745dbc 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -434,11 +434,13 @@ static int gre_rcv(struct sk_buff *skb) tpi.proto == htons(ETH_P_ERSPAN2))) { 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);