+/**
+ * Configure Proxy-ETR
+ *
+ * @param ip PETR's IP address
+ * @param is_add Flag that indicates if this is an addition or removal
+ *
+ * return 0 on success
+ */
+int
+vnet_lisp_use_petr (ip_address_t * ip, u8 is_add)
+{
+ lisp_cp_main_t *lcm = vnet_lisp_cp_get_main ();
+ u32 ls_index = ~0;
+ mapping_t *m;
+ vnet_lisp_add_del_locator_set_args_t _ls_args, *ls_args = &_ls_args;
+ locator_t loc;
+
+ if (vnet_lisp_enable_disable_status () == 0)
+ {
+ clib_warning ("LISP is disabled!");
+ return VNET_API_ERROR_LISP_DISABLED;
+ }
+
+ memset (ls_args, 0, sizeof (*ls_args));
+
+ if (is_add)
+ {
+ /* Create dummy petr locator-set */
+ memset (&loc, 0, sizeof (loc));
+ gid_address_from_ip (&loc.address, ip);
+ loc.priority = 1;
+ loc.state = loc.weight = 1;
+ loc.local = 0;
+
+ ls_args->is_add = 1;
+ ls_args->index = ~0;
+ vec_add1 (ls_args->locators, loc);
+ vnet_lisp_add_del_locator_set (ls_args, &ls_index);
+
+ /* Add petr mapping */
+ pool_get (lcm->mapping_pool, m);
+ m->locator_set_index = ls_index;
+ lcm->petr_map_index = m - lcm->mapping_pool;
+
+ /* Enable use-petr */
+ lcm->flags |= LISP_FLAG_USE_PETR;
+ }
+ else
+ {
+ m = pool_elt_at_index (lcm->mapping_pool, lcm->petr_map_index);
+
+ /* Remove petr locator */
+ ls_args->is_add = 0;
+ ls_args->index = m->locator_set_index;
+ vnet_lisp_add_del_locator_set (ls_args, 0);
+
+ /* Remove petr mapping */
+ pool_put_index (lcm->mapping_pool, lcm->petr_map_index);
+
+ /* Disable use-petr */
+ lcm->flags &= ~LISP_FLAG_USE_PETR;
+ }
+ return 0;
+}
+