1 files changed, 54 insertions, 14 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index ffe9cb719c0e..93b0310317be 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -70,7 +70,7 @@ struct dst_entry {
 
         struct  dst_ops         *ops;
 
-        u32                     metrics[RTAX_MAX];
+        u32                     _metrics[RTAX_MAX];
 
 #ifdef CONFIG_NET_CLS_ROUTE
         __u32                   tclassid;
@@ -94,19 +94,59 @@ struct dst_entry {
         int                     __use;
         unsigned long           lastuse;
         union {
-                struct dst_entry *next;
-                struct rtable __rcu *rt_next;
-                struct rt6_info   *rt6_next;
-                struct dn_route  *dn_next;
+                struct dst_entry        *next;
+                struct rtable __rcu     *rt_next;
+                struct rt6_info         *rt6_next;
+                struct dn_route __rcu   *dn_next;
         };
 };
 
 #ifdef __KERNEL__
 
 static inline u32
-dst_metric(const struct dst_entry *dst, int metric)
+dst_metric_raw(const struct dst_entry *dst, const int metric)
 {
-        return dst->metrics[metric-1];
+        return dst->_metrics[metric-1];
+}
+
+static inline u32
+dst_metric(const struct dst_entry *dst, const int metric)
+{
+        WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
+                     metric == RTAX_ADVMSS ||
+                     metric == RTAX_MTU);
+        return dst_metric_raw(dst, metric);
+}
+
+static inline u32
+dst_metric_advmss(const struct dst_entry *dst)
+{
+        u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
+
+        if (!advmss)
+                advmss = dst->ops->default_advmss(dst);
+
+        return advmss;
+}
+
+static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
+{
+        dst->_metrics[metric-1] = val;
+}
+
+static inline void dst_import_metrics(struct dst_entry *dst, const u32 *src_metrics)
+{
+        memcpy(dst->_metrics, src_metrics, RTAX_MAX * sizeof(u32));
+}
+
+static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
+{
+        dst_import_metrics(dest, src->_metrics);
+}
+
+static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
+{
+        return dst->_metrics;
 }
 
 static inline u32
@@ -117,11 +157,11 @@ dst_feature(const struct dst_entry *dst, u32 feature)
 
 static inline u32 dst_mtu(const struct dst_entry *dst)
 {
-        u32 mtu = dst_metric(dst, RTAX_MTU);
-        /*
-         * Alexey put it here, so ask him about it :)
-         */
-        barrier();
+        u32 mtu = dst_metric_raw(dst, RTAX_MTU);
+
+        if (!mtu)
+                mtu = dst->ops->default_mtu(dst);
+
         return mtu;
 }
 
@@ -134,7 +174,7 @@ static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metr
 static inline void set_dst_metric_rtt(struct dst_entry *dst, int metric,
                                       unsigned long rtt)
 {
-        dst->metrics[metric-1] = jiffies_to_msecs(rtt);
+        dst_metric_set(dst, metric, jiffies_to_msecs(rtt));
 }
 
 static inline u32
@@ -147,7 +187,7 @@ dst_allfrag(const struct dst_entry *dst)
 }
 
 static inline int
-dst_metric_locked(struct dst_entry *dst, int metric)
+dst_metric_locked(const struct dst_entry *dst, int metric)
 {
         return dst_metric(dst, RTAX_LOCK) & (1<<metric);
 }