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/*
* Copyright (c) 2016 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 <vnet/mpls/mpls_types.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_entry_src.h>
#include <vnet/fib/mpls_fib.h>
/**
* Source initialisation Function
*/
static void
fib_entry_src_mpls_init (fib_entry_src_t *src)
{
mpls_eos_bit_t eos;
src->fes_flags = FIB_ENTRY_SRC_FLAG_NONE;
src->u.mpls.fesm_label = MPLS_LABEL_INVALID;
FOR_EACH_MPLS_EOS_BIT(eos)
{
src->u.mpls.fesm_lfes[eos] = FIB_NODE_INDEX_INVALID;
}
}
/**
* Source deinitialisation Function
*/
static void
fib_entry_src_mpls_deinit (fib_entry_src_t *src)
{
}
static void
fib_entry_src_mpls_remove (fib_entry_src_t *src)
{
src->fes_pl = FIB_NODE_INDEX_INVALID;
src->u.mpls.fesm_label = MPLS_LABEL_INVALID;
}
static void
fib_entry_src_mpls_add (fib_entry_src_t *src,
const fib_entry_t *entry,
fib_entry_flag_t flags,
dpo_proto_t proto,
const dpo_id_t *dpo)
{
src->fes_pl =
fib_path_list_create_special(proto,
FIB_PATH_LIST_FLAG_DROP,
drop_dpo_get(proto));
}
static void
fib_entry_src_mpls_set_data (fib_entry_src_t *src,
const fib_entry_t *entry,
const void *data)
{
fib_protocol_t payload_proto;
fib_node_index_t fei;
mpls_label_t label;
mpls_eos_bit_t eos;
/*
* post MPLS table alloc and the possible rea-alloc of fib entrys
* the entry pointer will no longer be valid. so save its index
*/
payload_proto = entry->fe_prefix.fp_proto;
fei = fib_entry_get_index(entry);
label = *(mpls_label_t*)data;
if (MPLS_LABEL_INVALID == label)
{
/*
* removing the local label
*/
FOR_EACH_MPLS_EOS_BIT(eos)
{
fib_table_entry_delete_index(src->u.mpls.fesm_lfes[eos],
FIB_SOURCE_SPECIAL);
}
fib_table_unlock(MPLS_FIB_DEFAULT_TABLE_ID,
FIB_PROTOCOL_MPLS,
FIB_SOURCE_MPLS);
src->u.mpls.fesm_label = label;
}
else
{
fib_prefix_t prefix = {
.fp_proto = FIB_PROTOCOL_MPLS,
.fp_label = label,
};
fib_node_index_t fib_index;
dpo_id_t dpo = DPO_INVALID;
/*
* adding a new local label. make sure the MPLS fib exists.
*/
if (MPLS_LABEL_INVALID == src->u.mpls.fesm_label)
{
fib_index =
fib_table_find_or_create_and_lock(FIB_PROTOCOL_MPLS,
MPLS_FIB_DEFAULT_TABLE_ID,
FIB_SOURCE_MPLS);
}
else
{
fib_index = mpls_fib_index_from_table_id(MPLS_FIB_DEFAULT_TABLE_ID);
/*
* if this is a change in label, reomve the old one first
*/
if (src->u.mpls.fesm_label != label)
{
FOR_EACH_MPLS_EOS_BIT(eos)
{
ASSERT(FIB_NODE_INDEX_INVALID != src->u.mpls.fesm_lfes[eos]);
fib_table_entry_delete_index(src->u.mpls.fesm_lfes[eos],
FIB_SOURCE_SPECIAL);
}
}
}
src->u.mpls.fesm_label = label;
FOR_EACH_MPLS_EOS_BIT(eos)
{
prefix.fp_eos = eos;
prefix.fp_payload_proto = fib_proto_to_dpo(payload_proto);
fib_entry_contribute_forwarding(fei,
(eos ?
FIB_FORW_CHAIN_TYPE_MPLS_EOS :
FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS),
&dpo);
src->u.mpls.fesm_lfes[eos] =
fib_table_entry_special_dpo_add(fib_index,
&prefix,
FIB_SOURCE_SPECIAL,
FIB_ENTRY_FLAG_EXCLUSIVE,
&dpo);
dpo_reset(&dpo);
}
}
}
static const void *
fib_entry_src_mpls_get_data (fib_entry_src_t *src,
const fib_entry_t *entry)
{
return (&(src->u.mpls.fesm_label));
}
static u8*
fib_entry_src_mpls_format (fib_entry_src_t *src,
u8* s)
{
return (format(s, " local-label:%d", src->u.mpls.fesm_label));
}
const static fib_entry_src_vft_t mpls_src_vft = {
.fesv_init = fib_entry_src_mpls_init,
.fesv_deinit = fib_entry_src_mpls_deinit,
.fesv_add = fib_entry_src_mpls_add,
.fesv_remove = fib_entry_src_mpls_remove,
.fesv_format = fib_entry_src_mpls_format,
.fesv_set_data = fib_entry_src_mpls_set_data,
.fesv_get_data = fib_entry_src_mpls_get_data,
/*
* .fesv_fwd_update = fib_entry_src_mpls_fwd_update,
* When the forwarding for the IP entry is updated, any MPLS chains
* it has created are also updated. Since the MPLS entry will have already
* installed that chain/load-balance there is no need to update the netry
* FIXME: later: propagate any walk to the children of the MPLS entry. for SR
*/
};
void
fib_entry_src_mpls_register (void)
{
fib_entry_src_register(FIB_SOURCE_MPLS, &mpls_src_vft);
}
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