datapath: Better handle vlan packets sent to userspace.

[openvswitch] / datapath / datapath.c

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 54248e2e6fab35a907ef9ca901147f5d45f3f351..1ea5d1e9a7c2d850cf989b34c6a5f3e7b53d25ac 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -437,17 +437,28 @@ static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
                                  const struct dp_upcall_info *upcall_info)
 {
        struct ovs_header *upcall;
+       struct sk_buff *nskb = NULL;
        struct sk_buff *user_skb; /* to be queued to userspace */
        struct nlattr *nla;
        unsigned int len;
        int err;
 
-       err = vlan_deaccel_tag(skb);
-       if (unlikely(err))
-               return err;
+       if (vlan_tx_tag_present(skb)) {
+               nskb = skb_clone(skb, GFP_ATOMIC);
+               if (!nskb)
+                       return -ENOMEM;
+               
+               err = vlan_deaccel_tag(nskb);
+               if (err)
+                       return err;
+
+               skb = nskb;
+       }
 
-       if (nla_attr_size(skb->len) > USHRT_MAX)
-               return -EFBIG;
+       if (nla_attr_size(skb->len) > USHRT_MAX) {
+               err = -EFBIG;
+               goto out;
+       }
 
        len = sizeof(struct ovs_header);
        len += nla_total_size(skb->len);
@@ -456,8 +467,10 @@ static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
                len += nla_total_size(8);
 
        user_skb = genlmsg_new(len, GFP_ATOMIC);
-       if (!user_skb)
-               return -ENOMEM;
+       if (!user_skb) {
+               err = -ENOMEM;
+               goto out;
+       }
 
        upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
                             0, upcall_info->cmd);
@@ -475,7 +488,11 @@ static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
 
        skb_copy_and_csum_dev(skb, nla_data(nla));
 
-       return genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
+       err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
+
+out:
+       kfree_skb(nskb);
+       return err;
 }
 
 /* Called with genl_mutex. */