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Add netlink attributes for controlling gratuitous ARP and unsolicited NA forwarding when neighbor suppression is enabled. Add IFLA_BRPORT_NEIGH_FORWARD_GRAT for port-level control and BRIDGE_VLANDB_ENTRY_NEIGH_FORWARD_GRAT for per-VLAN control. The new attributes provide independent control of gratuitous ARP and unsolicited NA packets. Operators can enable forwarding for those packets for fast mobility across VTEPs while keeping general neighbor suppression active. Reviewed-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: Danielle Ratson <danieller@nvidia.com> Link: https://patch.msgid.link/20260511065936.4173106-2-danieller@nvidia.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>