1 files changed, 24 insertions, 9 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index f1c52cbd6ef..4f2014994a8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1190,11 +1190,14 @@ out:
 /**
  *      skb_gso_segment - Perform segmentation on skb.
  *      @skb: buffer to segment
- *      @sg: whether scatter-gather is supported on the target.
+ *      @features: features for the output path (see dev->features)
  *
  *      This function segments the given skb and returns a list of segments.
+ *
+ *      It may return NULL if the skb requires no segmentation.  This is
+ *      only possible when GSO is used for verifying header integrity.
  */
-struct sk_buff *skb_gso_segment(struct sk_buff *skb, int sg)
+struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
 {
         struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
         struct packet_type *ptype;
@@ -1210,12 +1213,14 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, int sg)
         rcu_read_lock();
         list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
                 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
-                        segs = ptype->gso_segment(skb, sg);
+                        segs = ptype->gso_segment(skb, features);
                         break;
                 }
         }
         rcu_read_unlock();
 
+        __skb_push(skb, skb->data - skb->mac.raw);
+
         return segs;
 }
 
@@ -1291,9 +1296,15 @@ static int dev_gso_segment(struct sk_buff *skb)
 {
         struct net_device *dev = skb->dev;
         struct sk_buff *segs;
+        int features = dev->features & ~(illegal_highdma(dev, skb) ?
+                                         NETIF_F_SG : 0);
+
+        segs = skb_gso_segment(skb, features);
+
+        /* Verifying header integrity only. */
+        if (!segs)
+                return 0;
 
-        segs = skb_gso_segment(skb, dev->features & NETIF_F_SG &&
-                                    !illegal_highdma(dev, skb));
         if (unlikely(IS_ERR(segs)))
                 return PTR_ERR(segs);
 
@@ -1310,13 +1321,17 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 if (netdev_nit)
                         dev_queue_xmit_nit(skb, dev);
 
-                if (!netif_needs_gso(dev, skb))
-                        return dev->hard_start_xmit(skb, dev);
+                if (netif_needs_gso(dev, skb)) {
+                        if (unlikely(dev_gso_segment(skb)))
+                                goto out_kfree_skb;
+                        if (skb->next)
+                                goto gso;
+                }
 
-                if (unlikely(dev_gso_segment(skb)))
-                        goto out_kfree_skb;
+                return dev->hard_start_xmit(skb, dev);
         }
 
+gso:
         do {
                 struct sk_buff *nskb = skb->next;
                 int rc;