+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+void
+__vlist_simple_init(struct vlist_simple_tree *tree, int offset)
+{
+ INIT_LIST_HEAD(&tree->list);
+ tree->version = 1;
+ tree->head_offset = offset;
+}
+
+void
+vlist_simple_delete(struct vlist_simple_tree *tree, struct vlist_simple_node *node)
+{
+ char *ptr;
+
+ list_del(&node->list);
+ ptr = (char *) node - tree->head_offset;
+ free(ptr);
+}
+
+void
+vlist_simple_flush(struct vlist_simple_tree *tree)
+{
+ struct vlist_simple_node *n, *tmp;
+
+ list_for_each_entry_safe(n, tmp, &tree->list, list) {
+ if ((n->version == tree->version || n->version == -1) &&
+ tree->version != -1)
+ continue;
+
+ vlist_simple_delete(tree, n);
+ }
+}
+
+void
+vlist_simple_replace(struct vlist_simple_tree *dest, struct vlist_simple_tree *old)
+{
+ struct vlist_simple_node *n, *tmp;
+
+ vlist_simple_update(dest);
+ list_for_each_entry_safe(n, tmp, &old->list, list) {
+ list_del(&n->list);
+ vlist_simple_add(dest, n);
+ }
+ vlist_simple_flush(dest);
+}
+
+void
+vlist_simple_flush_all(struct vlist_simple_tree *tree)
+{
+ tree->version = -1;
+ vlist_simple_flush(tree);
+}
+
+unsigned int
+parse_netmask_string(const char *str, bool v6)
+{
+ struct in_addr addr;
+ unsigned int ret;
+ char *err = NULL;
+
+ if (!strchr(str, '.')) {
+ ret = strtoul(str, &err, 0);
+ if (err && *err)
+ goto error;
+
+ return ret;
+ }
+
+ if (v6)
+ goto error;
+
+ if (inet_aton(str, &addr) != 1)
+ goto error;
+
+ return 32 - fls(~(ntohl(addr.s_addr)));
+
+error:
+ return ~0;
+}
+
+bool
+split_netmask(char *str, unsigned int *netmask, bool v6)