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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_ROUTE__
#define __HICN_ROUTE__
#include <vlib/vlib.h>
#include <vppinfra/error.h>
#include "hicn.h"
#include "faces/face.h"
/**
* @file route.h
*
* hICN uses a specific vrf to install the routes for a prefix has been enabled
* to be hicn. It considers the vrf 0 (the default vrf) as the dominating vrf
* on which every route is stored. Enabling a prefix to be hICN will copy all
* the routes in the vrf 0 for the given prefi, in the vrf HICN. Every
* modification made on the vrf 0 on an hICN enabled prefix is reflected in the
* vrf hICN (through the use of the fib entry tracking functionality).
* Moreover, we use the lookup in the vrf hICN as a way for punting packet that
* must be processed as hICN. The implementation will install a special dpo as
* a single next hop for the vpp load balancer for each entry in the vrf hICN
* that we enabled. Such dpo will have two purposes: 1) to punt packets to the
* hICN forwarding pipeline, 2) to point to the righe strategy (the dpoi_index
* will be an index to the strategy context while the dpoi_type will be an
* index to the strategy vft).
*
* Additionally, hICN assign each interface to the vrf hICN; this is required
* for the interest lookup. Vpp performs a lookup in the vrf assigned to the
* interface, therefore if an interface is not assigned to the hICN vrf, the
* lookup will be done on the vrf 0 and the packet won't be processed through
* the hicn forwarding pipeline.
*/
/*
* Adding each interface to the vrf hICN has the side effect that to ping you
* need to specify the vrf hICN in the command.
*/
extern fib_source_t hicn_fib_src;
extern dpo_type_t udp_encap_dpo_types[FIB_PROTOCOL_MAX];
/**
* @Brief Return the hicn_dpo corresponding to the prefix in teh vrf HICN
*
* @param prefix Prefix for which we want to retrieve the hICN dpo
* @param hicn_dpo return value with the hicn_dpo
* @param fib_index return value with the fib index corresponding to the prefix
*/
int hicn_route_get_dpo (const fib_prefix_t *prefix, const dpo_id_t **hicn_dpo,
u32 *fib_index);
/**
* @Brief Set the strategy for a given prefix
*
* @param prefix Prefix for which we set the strategy
* @param stretegy_id Index of the strategy to set
*/
int hicn_route_set_strategy (fib_prefix_t *prefix, u32 strategy_id);
/**
* @Brief Helper to add an adj nex hop in the vrf 0. If there are no entries in
* the vrf 0 that matches with the prefix (epm), a new one is created.
*
* @param fib_proto FIB_PROTOCOL_IP6 or FIB_PROTOCOL_IP4 (mpls not supported)
* @param rpfx Prefix for which to add a next hop
* @param nh Next hop to add
* @param sw_if Software interface index to add in the next hop
*/
int ip_nh_adj_add_del_helper (fib_protocol_t fib_proto,
const fib_prefix_t *rpfx, ip46_address_t *nh,
u32 sw_if, u8 is_add);
/**
* @Brief Helper to add an udp-tunnel nex hop in the vrf 0. If there are no
* entries in the vrf 0 that matches with the prefix (epm), a new one is
* created.
*
* @param fib_proto FIB_PROTOCOL_IP6 or FIB_PROTOCOL_IP4 (mpls not supported)
* @param rpfx Prefix for which to add a next hop
* @param uei The UDP ENCAP ID
* @param proto The payload proto for this encap
*/
int ip_nh_udp_tunnel_add_del_helper (fib_protocol_t fib_proto,
const fib_prefix_t *rpfx, u32 uei,
dpo_proto_t proto, u8 is_add);
/**
* @Brief Enable an hICN for an ip prefix
*
* @param prefix Prefix for which we enable hICN
* @return HICN_ERROR_NONE if hICN was enabled on the prefix
* HICN_ERROR_ROUTE_NO_LD if the first dpo for the fib entry corresponding to
* the prefix is not a load_balancer HICN_ERROR_ROUTE_DPO_NO_HICN if the
* loadbalancer in the vrf HICN already contains a dpo which is not an hICN one
* HICN_ERROR_ROUTE_MLT_LD if there are more than a dpo in the vpp loadbalancer
*/
int hicn_route_enable (const fib_prefix_t *prefix,
fib_node_index_t *hicn_fib_node_index,
hicn_face_id_t **vec_faces);
/**
* @Brief Disable an hICN for an ip prefix. If hICN wasn't enable on the prefix
* nothing happens and it returns HICN_ERROR_ROUTE_NOT_FOUND
*
* @param prefix Prefix for which we disable hICN
*/
int hicn_route_disable (fib_prefix_t *prefix);
/* Init route internal strustures */
void hicn_route_init ();
#endif /* //__HICN_ROUTE__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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