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/*
* Copyright (c) 2021 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.
*/
#ifndef __HICN_STRATEGY__
#define __HICN_STRATEGY__
#include "hicn.h"
#include "hashtb.h"
#include "mgmt.h"
#include "faces/face.h"
/**
* @file strategy.h
*
* A strategy is defined as a dpo and a set of function (vft) that will be
* called during the packet processing. A strategy is associated to an entry in
* the fib by assigning the corresponding dpo to the fib entry. The dpo points
* to a hICN dpo context (ctx) which contains the information needed by the
* strategy to compute the next hop. Each strategy hash its own dpo type, which
* means that the dpo_type uniquely identifies a strategy and its vft. The
* strategy node will use the dpo_type to retrieve the corresponding vft. Here
* we provide:
* - a template for the callbacks to implement in order to create a new
* strategy (hicn_fwd_strategy_t)
* - a default implementation for the strategy node which will call the
* strategy functions while processing the interest packets
*/
/* Trace context struct */
typedef struct
{
u32 next_index;
u32 sw_if_index;
u8 pkt_type;
dpo_type_t dpo_type;
} hicn_strategy_trace_t;
typedef struct hicn_strategy_vft_s
{
void (*hicn_receive_data) (index_t dpo_idx, int nh_idx);
void (*hicn_on_interest_timeout) (index_t dpo_idx);
void (*hicn_add_interest) (index_t dpo_idx, hicn_hash_entry_t *pit_entry);
u32 (*hicn_select_next_hop) (index_t dpo_idx, int *nh_idx,
hicn_face_id_t *outfaces, uint32_t *len);
u8 *(*hicn_format_strategy_trace) (u8 *, hicn_strategy_trace_t *);
u8 *(*hicn_format_strategy) (u8 *s, va_list *ap);
/**< Format an hICN dpo*/
} hicn_strategy_vft_t;
typedef enum
{
HICN_STRATEGY_NEXT_INTEREST_HITPIT,
HICN_STRATEGY_NEXT_INTEREST_HITCS,
HICN_STRATEGY_NEXT_INTEREST_FACE4,
HICN_STRATEGY_NEXT_INTEREST_FACE6,
HICN_STRATEGY_NEXT_ERROR_DROP,
HICN_STRATEGY_N_NEXT,
} hicn_strategy_next_t;
const static char *const hicn_ip6_nodes[] = {
"hicn6-iface-input", // this is the name you give your node in
// VLIB_REGISTER_NODE
NULL,
};
const static char *const hicn_ip4_nodes[] = {
"hicn4-iface-input", // this is the name you give your node in
// VLIB_REGISTER_NODE
NULL,
};
const static char *const *const hicn_nodes_strategy[DPO_PROTO_NUM] = {
[DPO_PROTO_IP6] = hicn_ip6_nodes,
[DPO_PROTO_IP4] = hicn_ip4_nodes,
};
const static uint32_t MAX_OUT_FACES = 8;
extern vlib_node_registration_t hicn_strategy_node;
#endif /* //__HICN_STRATEGY__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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