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>
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