sflq_allocator.h

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// Copyright (C) 2026 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef SFLQ_ALLOCATOR_H
#define SFLQ_ALLOCATOR_H
 
#include <dhcpsrv/allocator.h>
#include <dhcpsrv/sflq_allocation_state.h>
#include <dhcpsrv/lease.h>
#include <cstdint>
 
namespace isc {
namespace dhcp {

class SharedFlqAllocator : public Allocator {
public:

    SharedFlqAllocator(Lease::Type type, const WeakSubnetPtr& subnet);

    virtual std::string getType() const {
        return ("shared-flq");
    }

    static void setInUse(bool in_use);

    static bool inUse();

    SubnetSflqAllocationStatePtr getSubnetState() const;

    static void sanityChecksSflqAllocator4(Subnet4Ptr subnet);

    static void sanityChecksSflqAllocator6(Subnet6Ptr subnet);

    static constexpr size_t MAX_V4_POOL_SIZE = 16777216;

    static constexpr size_t MAX_V6_POOL_SIZE = 16777216;
 
private:

    virtual void initAfterConfigureInternal();

    virtual asiolink::IOAddress pickAddressInternal(const ClientClasses& client_classes,
                                                    const IdentifierBaseTypePtr& duid,
                                                    const asiolink::IOAddress& hint);

    virtual isc::asiolink::IOAddress
    pickPrefixInternal(const ClientClasses& client_classes,
                       Pool6Ptr& pool,
                       const IdentifierBaseTypePtr& duid,
                       PrefixLenMatchType prefix_length_match,
                       const isc::asiolink::IOAddress& hint,
                       uint8_t hint_prefix_length);

    uint64_t getRandomNumber(uint64_t limit);

    std::mt19937 generator_;
};
 
} // end of namespace isc::dhcp
} // end of namespace isc
 
#endif // SFLQ_ALLOCATOR_H