openvswitch: Fix push/pop ethernet validation

When there are both pop and push ethernet header actions among the
actions to be applied to a packet, an unexpected EINVAL (Invalid
argument) error is obtained. This is due to mac_proto not being reset
correctly when those actions are validated.

Reported-at:
https://mail.openvswitch.org/pipermail/ovs-discuss/2018-October/047554.html
Fixes: 91820da6ae85 ("openvswitch: add Ethernet push and pop actions")
Signed-off-by: Jaime Caamaño Ruiz <jcaamano@suse.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index a70097e..865ecef 100644 (file)
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -3030,7 +3030,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
                         * is already present */
                        if (mac_proto != MAC_PROTO_NONE)
                                return -EINVAL;
-                       mac_proto = MAC_PROTO_NONE;
+                       mac_proto = MAC_PROTO_ETHERNET;
                        break;
 
                case OVS_ACTION_ATTR_POP_ETH:
@@ -3038,7 +3038,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
                                return -EINVAL;
                        if (vlan_tci & htons(VLAN_TAG_PRESENT))
                                return -EINVAL;
-                       mac_proto = MAC_PROTO_ETHERNET;
+                       mac_proto = MAC_PROTO_NONE;
                        break;
 
                case OVS_ACTION_ATTR_PUSH_NSH: