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/*
* Copyright (c) 2021-2022 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* \file strategy_vft.h
* \brief hICN forwarding strategy VFT
*/
#ifndef HICNLIGHT_STRATEGY_VFT_H
#define HICNLIGHT_STRATEGY_VFT_H
#include "msgbuf.h"
#include "../strategies/best_path.h"
#include "../strategies/load_balancer.h"
#include "../strategies/random.h"
#include "../strategies/replication.h"
typedef union {
strategy_load_balancer_options_t load_balancer;
strategy_random_options_t random;
strategy_replication_options_t replication;
strategy_bestpath_options_t bestpath;
} strategy_options_t;
typedef struct {
#ifdef WITH_POLICY
int priority;
#endif /* WITH_POLICY */
union {
strategy_load_balancer_nexthop_state_t load_balancer;
strategy_random_nexthop_state_t random;
strategy_replication_nexthop_state_t replication;
strategy_bestpath_nexthop_state_t bestpath;
};
} strategy_nexthop_state_t;
#define STRATEGY_NEXTHOP_STATE_EMPTY \
{ \
0, { \
{ 0 } \
} \
}
typedef union {
strategy_load_balancer_state_t load_balancer;
strategy_random_state_t random;
strategy_replication_state_t replication;
strategy_bestpath_state_t bestpath;
} strategy_state_t;
// XXX This has to be merged with nexthops
// XXX How to avoid errors due to pool id reuse (eg on_data) ?
/**
* @typedef strategy_ops_t
* @abstract Forwarding strategy implementation
* @constant receiveObject is called when we receive an object and have a
* measured round trip time. This allows a strategy to update its performance
* data.
* @constant lookupNexthop Find the set of nexthops to use for the Interest.
* May be empty, should not be NULL. Must be destroyed.
* @constant addNexthop Add a nexthop to the list of available nexthops with a
* routing protocol-specific cost.
* @constant destroy cleans up the strategy, freeing all memory and state. A
* strategy is reference counted, so the final destruction only happens after
* the last reference is released.
* @discussion <#Discussion#>
*/
struct strategy_entry_s;
struct nexthops_s;
typedef struct {
const char *name;
int (*initialize)(struct strategy_entry_s *entry, const void *forwarder);
int (*finalize)(struct strategy_entry_s *entry);
struct nexthops_s *(*lookup_nexthops)(struct strategy_entry_s *entry,
struct nexthops_s *nexthops,
const msgbuf_t *msgbuf);
int (*add_nexthop)(struct strategy_entry_s *strategy,
struct nexthops_s *nexthops, off_t offset);
int (*remove_nexthop)(struct strategy_entry_s *entry,
struct nexthops_s *nexthops, off_t offset);
int (*on_data)(struct strategy_entry_s *entry, struct nexthops_s *nexthops,
const struct nexthops_s *data_nexthops, const msgbuf_t *msgbuf,
Ticks pitEntryCreation, Ticks objReception);
int (*on_timeout)(struct strategy_entry_s *entry, struct nexthops_s *nexthops,
const struct nexthops_s *timeout_nexthops);
} strategy_ops_t;
extern const strategy_ops_t *const strategy_vft[];
#define DECLARE_STRATEGY(NAME) \
const strategy_ops_t strategy_##NAME = { \
.name = #NAME, \
.initialize = strategy_##NAME##_initialize, \
.finalize = strategy_##NAME##_finalize, \
.add_nexthop = strategy_##NAME##_add_nexthop, \
.remove_nexthop = strategy_##NAME##_remove_nexthop, \
.lookup_nexthops = strategy_##NAME##_lookup_nexthops, \
.on_data = strategy_##NAME##_on_data, \
.on_timeout = strategy_##NAME##_on_timeout, \
}
#endif /* HICNLIGHT_STRATEGY_VFT_H */
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