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/*
* Copyright (c) 2020 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.
*/
#include "host_stack.h"
#include "route.h"
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_table.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/dpo/dpo.h>
#include <vnet/dpo/load_balance.h>
#include <vlib/global_funcs.h>
#include <vnet/dpo/drop_dpo.h>
#define FIB_SOURCE_HICN_HS 0x04 //Right after the FIB_SOURCE_INTERFACE priority
#define HICN_HS_FIB_TABLE 0
fib_source_t hicn_hs_fib_src;
void
hicn_hs_route_init ()
{
hicn_hs_fib_src = fib_source_allocate ("hicn_hs", FIB_SOURCE_HICN_HS, FIB_SOURCE_BH_API);
}
always_inline int
hicn_route_get_dpo (const fib_prefix_t * prefix,
const dpo_id_t ** hicn_dpo, u32 * fib_index)
{
//fib_prefix_t fib_pfx;
const dpo_id_t *load_balance_dpo_id;
const dpo_id_t *former_dpo_id;
int found = 0, ret = HICN_HS_ERROR_ROUTE_NOT_FOUND;
fib_node_index_t fib_entry_index;
/* Check if the route already exist in the fib */
/*
* ASSUMPTION: we use table 0 which is the default table and it is
* already existing and locked
*/
*fib_index = fib_table_find_or_create_and_lock (prefix->fp_proto,
HICN_HS_FIB_TABLE,
hicn_hs_fib_src);
fib_entry_index = fib_table_lookup_exact_match (*fib_index, prefix);
if (fib_entry_index != FIB_NODE_INDEX_INVALID)
{
/* Route already existing. We need to update the dpo. */
load_balance_dpo_id =
fib_entry_contribute_ip_forwarding (fib_entry_index);
/* The dpo is not a load balance dpo as expected */
if (load_balance_dpo_id->dpoi_type != DPO_LOAD_BALANCE)
ret = HICN_HS_ERROR_ROUTE_NO_LB_DPO;
else
{
/* former_dpo_id is a load_balance dpo */
load_balance_t *lb =
load_balance_get (load_balance_dpo_id->dpoi_index);
/* FIB entry exists but there is no hicn_hs dpo. */
ret = HICN_HS_ERROR_ROUTE_DPO_NO_HICN;
for (int i = 0; i < lb->lb_n_buckets && !found; i++)
{
former_dpo_id = load_balance_get_bucket_i (lb, i);
if (dpo_is_hicn_hs (former_dpo_id))
{
*hicn_dpo = former_dpo_id;
ret = HICN_HS_ERROR_NONE;
found = 1;
}
}
}
}
/*
* Remove the lock from the table. We keep one lock per route, not
* per dpo
*/
fib_table_unlock (*fib_index, prefix->fp_proto, hicn_hs_fib_src);
return ret;
}
/* Add a new route for a name prefix */
always_inline
int hicn_hs_route_add_flags (const fib_prefix_t * prefix, const dpo_id_t *dpo, fib_entry_flag_t flags)
{
CLIB_UNUSED(vlib_main_t *vm) = vlib_get_main ();
int ret = HICN_HS_ERROR_NONE;
u32 fib_index;
const dpo_id_t *_dpo;
ret = hicn_route_get_dpo (prefix, &_dpo, &fib_index);
if (ret == HICN_HS_ERROR_ROUTE_NOT_FOUND)
{
/* Here is where we create the "via" like route */
/*
* For the moment we use the global one the prefix you want
* to match Neale suggested -- FIB_SOURCE_HICN the client
* that is adding them -- no easy explanation at this time…
*/
fib_node_index_t new_fib_node_index =
fib_table_entry_special_dpo_add (fib_index,
prefix,
hicn_hs_fib_src,
flags,
dpo);
/* We added a route, therefore add one lock to the table */
fib_table_lock (fib_index, prefix->fp_proto, hicn_hs_fib_src);
ret =
(new_fib_node_index !=
FIB_NODE_INDEX_INVALID) ? HICN_HS_ERROR_NONE :
HICN_HS_ERROR_ROUTE_NO_INSERT;
}
return ret;
}
int
hicn_hs_route_add (const fib_prefix_t * prefix, const dpo_id_t *dpo)
{
return hicn_hs_route_add_flags(prefix, dpo, (FIB_ENTRY_FLAG_EXCLUSIVE |
FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
}
clib_error_t *
hicn_hs_set_local_prefix(const fib_prefix_t * prefix)
{
clib_error_t * ret = 0;
int rv;
const dpo_id_t *drop_dpo = drop_dpo_get(prefix->fp_proto == FIB_PROTOCOL_IP4 ? DPO_PROTO_IP4 : DPO_PROTO_IP6);
rv = hicn_hs_route_add_flags(prefix, drop_dpo, (FIB_ENTRY_FLAG_EXCLUSIVE | FIB_ENTRY_FLAG_LOCAL | FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
if (rv)
ret = clib_error_return (0, "Error: %s", hicn_hs_error_strings[rv]);
return ret;
}
int
hicn_route_del (fib_prefix_t * prefix)
{
const dpo_id_t *hicn_dpo_id;
int ret = HICN_HS_ERROR_NONE;
u32 fib_index;
/* Remove the fib entry only if the dpo is of type hicn */
ret = hicn_route_get_dpo (prefix, &hicn_dpo_id, &fib_index);
if (ret == HICN_HS_ERROR_NONE)
{
fib_table_entry_special_remove (HICN_HS_FIB_TABLE, prefix, hicn_hs_fib_src);
/*
* Remove the lock from the table. We keep one lock per route
*/
fib_table_unlock (fib_index, prefix->fp_proto, hicn_hs_fib_src);
}
// Remember to remove the lock from the table when removing the entry
return ret;
}
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