1 files changed, 13 insertions, 1 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index 755ac6c1aa03..03a1c3d52d80 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -112,10 +112,22 @@ dst_metric_raw(const struct dst_entry *dst, const int metric)
 static inline u32
 dst_metric(const struct dst_entry *dst, const int metric)
 {
-        WARN_ON_ONCE(metric == RTAX_HOPLIMIT);
+        WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
+                     metric == RTAX_ADVMSS);
         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;