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Subject[PATCH v3,net-next 1/2] ip_gre: fix error path when erspan_rcv failed
Date
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>

---
Change since v3:
* Rebase on latest master branch.
* Fix wrong commit information.
---
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 3029e3e..90c9123 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -436,11 +436,13 @@ 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


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