gre6: Call skb_checksum_simple_validate

Use skb_checksum_simple_validate to verify checksum.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 11 deletions

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 75277b739b04..3873181ed856 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -468,17 +468,7 @@ static int ip6gre_rcv(struct sk_buff *skb)
                         goto drop;
 
                 if (flags&GRE_CSUM) {
-                        switch (skb->ip_summed) {
-                        case CHECKSUM_COMPLETE:
-                                csum = csum_fold(skb->csum);
-                                if (!csum)
-                                        break;
-                                /* fall through */
-                        case CHECKSUM_NONE:
-                                skb->csum = 0;
-                                csum = __skb_checksum_complete(skb);
-                                skb->ip_summed = CHECKSUM_COMPLETE;
-                        }
+                        csum = skb_checksum_simple_validate(skb);
                         offset += 4;
                 }
                 if (flags&GRE_KEY) {