1 files changed, 69 insertions, 23 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index 39c4a5963e12..02386505033d 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -83,8 +83,6 @@ struct dst_entry {
          * (L1_CACHE_SIZE would be too much)
          */
 #ifdef CONFIG_64BIT
-        long                    __pad_to_align_refcnt[2];
-#else
         long                    __pad_to_align_refcnt[1];
 #endif
         /*
@@ -170,6 +168,12 @@ static inline void dst_use(struct dst_entry *dst, unsigned long time)
         dst->lastuse = time;
 }
 
+static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
+{
+        dst->__use++;
+        dst->lastuse = time;
+}
+
 static inline
 struct dst_entry * dst_clone(struct dst_entry * dst)
 {
@@ -179,22 +183,79 @@ struct dst_entry * dst_clone(struct dst_entry * dst)
 }
 
 extern void dst_release(struct dst_entry *dst);
+
+static inline void refdst_drop(unsigned long refdst)
+{
+        if (!(refdst & SKB_DST_NOREF))
+                dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
+}
+
+/**
+ * skb_dst_drop - drops skb dst
+ * @skb: buffer
+ *
+ * Drops dst reference count if a reference was taken.
+ */
 static inline void skb_dst_drop(struct sk_buff *skb)
 {
-        if (skb->_skb_dst)
-                dst_release(skb_dst(skb));
-        skb->_skb_dst = 0UL;
+        if (skb->_skb_refdst) {
+                refdst_drop(skb->_skb_refdst);
+                skb->_skb_refdst = 0UL;
+        }
+}
+
+static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
+{
+        nskb->_skb_refdst = oskb->_skb_refdst;
+        if (!(nskb->_skb_refdst & SKB_DST_NOREF))
+                dst_clone(skb_dst(nskb));
+}
+
+/**
+ * skb_dst_force - makes sure skb dst is refcounted
+ * @skb: buffer
+ *
+ * If dst is not yet refcounted, let's do it
+ */
+static inline void skb_dst_force(struct sk_buff *skb)
+{
+        if (skb_dst_is_noref(skb)) {
+                WARN_ON(!rcu_read_lock_held());
+                skb->_skb_refdst &= ~SKB_DST_NOREF;
+                dst_clone(skb_dst(skb));
+        }
+}
+
+
+/**
+ *      skb_tunnel_rx - prepare skb for rx reinsert
+ *      @skb: buffer
+ *      @dev: tunnel device
+ *
+ *      After decapsulation, packet is going to re-enter (netif_rx()) our stack,
+ *      so make some cleanups, and perform accounting.
+ */
+static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev)
+{
+        skb->dev = dev;
+        /* TODO : stats should be SMP safe */
+        dev->stats.rx_packets++;
+        dev->stats.rx_bytes += skb->len;
+        skb->rxhash = 0;
+        skb_set_queue_mapping(skb, 0);
+        skb_dst_drop(skb);
+        nf_reset(skb);
 }
 
 /* Children define the path of the packet through the
  * Linux networking.  Thus, destinations are stackable.
  */
 
-static inline struct dst_entry *dst_pop(struct dst_entry *dst)
+static inline struct dst_entry *skb_dst_pop(struct sk_buff *skb)
 {
-        struct dst_entry *child = dst_clone(dst->child);
+        struct dst_entry *child = skb_dst(skb)->child;
 
-        dst_release(dst);
+        skb_dst_drop(skb);
         return child;
 }
 
@@ -227,21 +288,6 @@ static inline void dst_confirm(struct dst_entry *dst)
                 neigh_confirm(dst->neighbour);
 }
 
-static inline void dst_negative_advice(struct dst_entry **dst_p,
-                                       struct sock *sk)
-{
-        struct dst_entry * dst = *dst_p;
-        if (dst && dst->ops->negative_advice) {
-                *dst_p = dst->ops->negative_advice(dst);
-
-                if (dst != *dst_p) {
-                        extern void sk_reset_txq(struct sock *sk);
-
-                        sk_reset_txq(sk);
-                }
-        }
-}
-
 static inline void dst_link_failure(struct sk_buff *skb)
 {
         struct dst_entry *dst = skb_dst(skb);