[PATCH v2,net-next 1/2] 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 <redacted>
Cc: William Tu <redacted>
Signed-off-by: Haishuang Yan <redacted>

Change since v2:
  * Rebase on latest master branch.
---
 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 33af55a..ccfc5bc 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);

-- 
1.8.3.1

Same as ipv4 code, when ip6erspan_rcv call return PACKET_REJECT, we
should call icmpv6_send to send icmp unreachable message in error path.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Acked-by: William Tu <redacted>
Cc: William Tu <redacted>
Signed-off-by: Haishuang Yan <redacted>

Change since v2:
  * Rebase on latest master branch.
---
 net/ipv6/ip6_gre.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 8ce9d42..f210f9c 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c

@@ -603,12 +603,13 @@ static int gre_rcv(struct sk_buff *skb)
 		     tpi.proto == htons(ETH_P_ERSPAN2))) {
 		if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
 			return 0;
-		goto drop;
+		goto out;
 	}
 
 	if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 		return 0;
 
+out:
 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 drop:
 	kfree_skb(skb);

-- 
1.8.3.1