[PATCH 4.4 249/312] openvswitch: update checksum in {push,pop}_mpls

[Greg Kroah-Hartman]

From: Simon Horman <simon.hor...@netronome.com>

commit bc7cc5999fd392cc799630d7e375b2f4e29cc398 upstream.

In the case of CHECKSUM_COMPLETE the skb checksum should be updated in
{push,pop}_mpls() as they the type in the ethernet header.

As suggested by Pravin Shelar.

Cc: Pravin Shelar <pshe...@nicira.com>
Fixes: 25cd9ba0abc0 ("openvswitch: Add basic MPLS support to kernel")
Signed-off-by: Simon Horman <simon.hor...@netronome.com>
Acked-by: Pravin B Shelar <pshe...@ovn.org>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/openvswitch/actions.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -137,11 +137,23 @@ static bool is_flow_key_valid(const stru
        return !!key->eth.type;
 }
 
+static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr,
+                            __be16 ethertype)
+{
+       if (skb->ip_summed == CHECKSUM_COMPLETE) {
+               __be16 diff[] = { ~(hdr->h_proto), ethertype };
+
+               skb->csum = ~csum_partial((char *)diff, sizeof(diff),
+                                       ~skb->csum);
+       }
+
+       hdr->h_proto = ethertype;
+}
+
 static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
                     const struct ovs_action_push_mpls *mpls)
 {
        __be32 *new_mpls_lse;
-       struct ethhdr *hdr;
 
        /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
        if (skb->encapsulation)
@@ -160,9 +172,7 @@ static int push_mpls(struct sk_buff *skb
 
        skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN);
 
-       hdr = eth_hdr(skb);
-       hdr->h_proto = mpls->mpls_ethertype;
-
+       update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
        if (!skb->inner_protocol)
                skb_set_inner_protocol(skb, skb->protocol);
        skb->protocol = mpls->mpls_ethertype;
@@ -193,7 +203,7 @@ static int pop_mpls(struct sk_buff *skb,
         * field correctly in the presence of VLAN tags.
         */
        hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN);
-       hdr->h_proto = ethertype;
+       update_ethertype(skb, hdr, ethertype);
        if (eth_p_mpls(skb->protocol))
                skb->protocol = ethertype;