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diff --git a/vpp/plugins/vcgn-plugin/vcgn/index_list.h b/vpp/plugins/vcgn-plugin/vcgn/index_list.h
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+++ b/vpp/plugins/vcgn-plugin/vcgn/index_list.h
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+/* 
+ *------------------------------------------------------------------
+ * index_list.h - vector-index-based doubly-linked lists
+ *
+ * Copyright (c) 2008-2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#ifndef _INDEX_LIST_H_
+#define _INDEX_LIST_H_ 1
+
+/* An index we can't possibly see in practice... */
+#define EMPTY ((u32)~0)
+
+typedef struct index_slist_ {
+    u32 next;
+} index_slist_t;
+
+/*
+ * index_slist_addhead
+ *
+ * args:  headp -- pointer to e.g. a hash bucket
+ *       vector -- vector containing the list
+ *       elsize -- size of an element in this vector
+ *       offset -- offset in each vector element of this list thread
+ * index_to_add -- index in the vector to add to the list
+ *
+ * Adds new items to the head of the list. Try not to screw up the args!
+ */
+static inline void 
+              index_slist_addhead_inline (index_slist_t *headp,
+                                          u8 *vector, u32 elsize, 
+                                          u32 offset, u32 index_to_add)
+{
+    index_slist_t *addme;
+
+    addme = (index_slist_t *)(vector + offset + elsize*index_to_add);
+    addme->next = EMPTY;
+
+    if (headp->next == EMPTY) {
+        headp->next = index_to_add;
+        return;
+    } else {
+        addme->next = headp->next;
+        headp->next = index_to_add;
+    }
+}
+
+/*
+ * index_slist_remelem
+ *
+ * args:  headp -- pointer to e.g. a hash bucket
+ *       vector -- vector containing the list
+ *       elsize -- size of an element in this vector
+ *       offset -- offset in each vector element of this list thread
+ * index_to_del -- index in the vector to delete from the list
+ *
+ * Try not to screw up the args!
+ */
+
+static inline int 
+              index_slist_remelem_inline (index_slist_t *headp,
+                                              u8 *vector, u32 elsize, 
+                                              u32 offset, u32 index_to_delete)
+{
+    index_slist_t *findme;
+    index_slist_t *prev;
+    index_slist_t *cur;
+
+    findme = (index_slist_t *)(vector + offset + elsize*index_to_delete);
+
+    if (headp->next == index_to_delete) {
+        headp->next = findme->next;
+        findme->next = EMPTY;
+        return 0;
+    }
+
+    prev = (index_slist_t *)(vector + offset + elsize*headp->next);
+    cur = (index_slist_t *)(vector + offset + elsize*prev->next);
+    while (cur != findme) {
+        if (cur->next == EMPTY)
+            return (1);
+        prev = cur;
+        cur = (index_slist_t *)(vector + offset + elsize*cur->next);
+    }
+    prev->next = findme->next;
+    findme->next = EMPTY;
+    return 0;
+}
+
+void index_slist_addhead (index_slist_t *headp, 
+                          u8 *vector, u32 elsize, u32 offset, u32 index);
+int index_slist_remelem (index_slist_t *headp,
+                         u8 *vector, u32 elsize, u32 offset, u32 index);
+
+typedef struct index_dlist_ {
+    u32 next;
+    u32 prev;
+} index_dlist_t;
+
+void index_dlist_addtail (u32 head_index, u8 *vector, u32 elsize, 
+                          u32 offset, u32 index_to_add);
+
+u32 index_dlist_remelem (u32 head_index, 
+                         u8 *vector, u32 elsize, u32 offset, 
+                         u32 index_to_delete);
+#endif /* _INDEX_LIST_H_ */