mlxsw: spectrum_router: Allow programming link-local host routes

Cited commit added the ability to program link-local prefix routes to
the ASIC so that relevant packets are routed and trapped correctly.

However, host routes were not included in the change and thus not
programmed to the ASIC. This can result in packets being trapped via an
external route trap instead of a local route trap as in IPv4.

Fix this by programming all the link-local routes to the ASIC.

Fixes: 10d3757f ("mlxsw: spectrum_router: Allow programming link-local prefix routes")
Reported-by: Alex Veber <alexve@mellanox.com>
Tested-by: Alex Veber <alexve@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -5001,15 +5001,6 @@ static void mlxsw_sp_router_fib4_del(struct mlxsw_sp *mlxsw_sp,
 
 static bool mlxsw_sp_fib6_rt_should_ignore(const struct fib6_info *rt)
 {
-	/* Packets with link-local destination IP arriving to the router
-	 * are trapped to the CPU, so no need to program specific routes
-	 * for them. Only allow prefix routes (usually one fe80::/64) so
-	 * that packets are trapped for the right reason.
-	 */
-	if ((ipv6_addr_type(&rt->fib6_dst.addr) & IPV6_ADDR_LINKLOCAL) &&
-	    (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)))
-		return true;
-
 	/* Multicast routes aren't supported, so ignore them. Neighbour
 	 * Discovery packets are specifically trapped.
 	 */