diff --git a/src/vppinfra/vec.h b/src/vppinfra/vec.h
index f233ae1..1b0378f 100644
--- a/src/vppinfra/vec.h
+++ b/src/vppinfra/vec.h
@@ -953,6 +953,27 @@
   _v(i);						\
 })
 
+/** \brief Search a vector for the index of the entry that matches.
+
+    @param v1 Pointer to a vector
+    @param v2 Pointer to entry to match
+    @param fn Comparison function !0 => match
+    @return index of match or ~0
+*/
+#define vec_search_with_function(v,E,fn)                \
+({							\
+  word _v(i) = 0;					\
+  while (_v(i) < vec_len(v))				\
+  {							\
+    if (0 != fn(&(v)[_v(i)], (E)))                      \
+      break;						\
+    _v(i)++;						\
+  }							\
+  if (_v(i) == vec_len(v))				\
+    _v(i) = ~0;					        \
+  _v(i);						\
+})
+
 /** \brief Sort a vector using the supplied element comparison function
 
     @param vec vector to sort