LISP: reject remote mappings that have as locators local IPs

Change-Id: Ifaf46554e45557ebf82009d9c46a9e905a46f884
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/vnet/lisp-cp/control.c b/src/vnet/lisp-cp/control.c
index 8d37cabc05c..cc73dfc5f02 100644
--- a/src/vnet/lisp-cp/control.c
+++ b/src/vnet/lisp-cp/control.c
@@ -993,6 +993,20 @@ mapping_delete_timer (lisp_cp_main_t * lcm, u32 mi)
   timing_wheel_delete (&lcm->wheel, mi);
 }
 
+static int
+is_local_ip (lisp_cp_main_t * lcm, ip_address_t * addr)
+{
+  fib_node_index_t fei;
+  fib_prefix_t prefix;
+  fib_entry_flag_t flags;
+
+  ip_address_to_fib_prefix (addr, &prefix);
+
+  fei = fib_table_lookup (0, &prefix);
+  flags = fib_entry_get_flags (fei);
+  return (FIB_ENTRY_FLAG_LOCAL & flags);
+}
+
 /**
  * Adds/removes/updates mapping. Does not program forwarding.
  *
@@ -1016,6 +1030,7 @@ vnet_lisp_add_del_mapping (gid_address_t * eid, locator_t * rlocs, u8 action,
   lisp_cp_main_t *lcm = vnet_lisp_cp_get_main ();
   u32 mi, ls_index = 0, dst_map_index;
   mapping_t *old_map;
+  locator_t *loc;
 
   if (vnet_lisp_enable_disable_status () == 0)
     {
@@ -1023,6 +1038,18 @@ vnet_lisp_add_del_mapping (gid_address_t * eid, locator_t * rlocs, u8 action,
       return VNET_API_ERROR_LISP_DISABLED;
     }
 
+  /* check if none of the locators match localy configured address */
+  vec_foreach (loc, rlocs)
+  {
+    ip_prefix_t *p = &gid_address_ippref (&loc->address);
+    if (is_local_ip (lcm, &ip_prefix_addr (p)))
+      {
+	clib_warning ("RLOC %U matches a local address!",
+		      format_gid_address, &loc->address);
+	return VNET_API_ERROR_LISP_RLOC_LOCAL;
+      }
+  }
+
   if (res_map_index)
     res_map_index[0] = ~0;