openvswitch: support MPLS push and pop for L3 packets

Update Ethernet header only if there is one.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index dc8bb97..064cbcb 100644 (file)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -187,7 +187,8 @@ static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
 
        skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN);
 
-       update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
+       if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET)
+               update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
        skb->protocol = mpls->mpls_ethertype;
 
        invalidate_flow_key(key);
@@ -197,7 +198,6 @@ static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
 static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
                    const __be16 ethertype)
 {
-       struct ethhdr *hdr;
        int err;
 
        err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
@@ -213,11 +213,15 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
        skb_reset_mac_header(skb);
        skb_set_network_header(skb, skb->mac_len);
 
-       /* mpls_hdr() is used to locate the ethertype field correctly in the
-        * presence of VLAN tags.
-        */
-       hdr = (struct ethhdr *)((void *)mpls_hdr(skb) - ETH_HLEN);
-       update_ethertype(skb, hdr, ethertype);
+       if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET) {
+               struct ethhdr *hdr;
+
+               /* mpls_hdr() is used to locate the ethertype field correctly in the
+                * presence of VLAN tags.
+                */
+               hdr = (struct ethhdr *)((void *)mpls_hdr(skb) - ETH_HLEN);
+               update_ethertype(skb, hdr, ethertype);
+       }
        if (eth_p_mpls(skb->protocol))
                skb->protocol = ethertype;