neighbour: send netlink notification if NTF_ROUTER changes

send netlink notification if neigh_update results in NTF_ROUTER
change and if NEIGH_UPDATE_F_ISROUTER is on. Also move the
NTF_ROUTER change function into a helper.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 6c1eecd56a4d..0874f7fcd859 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -544,4 +544,19 @@ static inline void neigh_update_ext_learned(struct neighbour *neigh, u32 flags,
                 *notify = 1;
         }
 }
+
+static inline void neigh_update_is_router(struct neighbour *neigh, u32 flags,
+                                          int *notify)
+{
+        u8 ndm_flags = 0;
+
+        ndm_flags |= (flags & NEIGH_UPDATE_F_ISROUTER) ? NTF_ROUTER : 0;
+        if ((neigh->flags ^ ndm_flags) & NTF_ROUTER) {
+                if (ndm_flags & NTF_ROUTER)
+                        neigh->flags |= NTF_ROUTER;
+                else
+                        neigh->flags &= ~NTF_ROUTER;
+                *notify = 1;
+        }
+}
 #endif