include: update kernel headers from v6.17-rc1

src/include/uapi/linux/neighbour.h

@@ -54,6 +54,7 @@ enum {
 /* Extended flags under NDA_FLAGS_EXT: */
 #define NTF_EXT_MANAGED		(1 << 0)
 #define NTF_EXT_LOCKED		(1 << 1)
+#define NTF_EXT_EXT_VALIDATED	(1 << 2)
 
 /*
  *	Neighbor Cache Entry States.
@@ -92,6 +93,10 @@ enum {
  * bridge in response to a host trying to communicate via a locked bridge port
  * with MAB enabled. Their purpose is to notify user space that a host requires
  * authentication.
+ *
+ * NTF_EXT_EXT_VALIDATED flagged neighbor entries were externally validated by
+ * a user space control plane. The kernel will not remove or invalidate them,
+ * but it can probe them and notify user space when they become reachable.
  */
 
 struct nda_cacheinfo {