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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/adj/adj_delegate.h>
#include <vnet/adj/adj_midchain.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry_track.h>
/**
* Midchain stacker delegate
*/
typedef struct adj_midchain_delegate_t_
{
/**
* the Fib Entry we are stacked on
*/
fib_node_index_t amd_fei;
/**
* The sibling entry on the FIB entry
*/
u32 amd_sibling;
} adj_midchain_delegate_t;
/**
* Pool of delegates
*/
static adj_midchain_delegate_t *amd_pool;
static inline const adj_midchain_delegate_t*
adj_midchain_from_const_base (const adj_delegate_t *ad)
{
if (NULL != ad)
{
return (pool_elt_at_index(amd_pool, ad->ad_index));
}
return (NULL);
}
static void
adj_midchain_delegate_restack_i (adj_index_t ai,
adj_midchain_delegate_t *amd)
{
if (vnet_sw_interface_is_admin_up (vnet_get_main (),
adj_get_sw_if_index(ai)) &&
(FIB_NODE_INDEX_INVALID != amd->amd_fei))
{
const fib_prefix_t *pfx;
pfx = fib_entry_get_prefix(amd->amd_fei);
adj_nbr_midchain_stack_on_fib_entry (
ai,
amd->amd_fei,
fib_forw_chain_type_from_fib_proto(pfx->fp_proto));
}
else
{
adj_nbr_midchain_unstack (ai);
}
}
void
adj_midchain_delegate_restack (adj_index_t ai)
{
adj_midchain_delegate_t *amd;
ip_adjacency_t *adj;
adj_delegate_t *ad;
/*
* if there's a delegate already use that
*/
adj = adj_get(ai);
ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
if (NULL != ad)
{
amd = pool_elt_at_index(amd_pool, ad->ad_index);
adj_midchain_delegate_restack_i(ai, amd);
}
/*
* else
* nothing to stack
*/
}
void
adj_midchain_delegate_stack (adj_index_t ai,
u32 fib_index,
const fib_prefix_t *pfx)
{
adj_midchain_delegate_t *amd;
ip_adjacency_t *adj;
adj_delegate_t *ad;
/*
* if there's a delegate already use that
*/
adj = adj_get(ai);
ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
if (NULL != ad)
{
amd = pool_elt_at_index(amd_pool, ad->ad_index);
}
else
{
pool_get(amd_pool, amd);
amd->amd_fei = FIB_NODE_INDEX_INVALID;
adj_delegate_add(adj, ADJ_DELEGATE_MIDCHAIN, amd - amd_pool);
amd->amd_fei = fib_entry_track(fib_index,
pfx,
FIB_NODE_TYPE_ADJ,
ai,
&amd->amd_sibling);
}
adj_midchain_delegate_restack_i(ai, amd);
}
void
adj_midchain_delegate_remove (adj_index_t ai)
{
adj_midchain_delegate_t *amd;
ip_adjacency_t *adj;
adj_delegate_t *ad;
/*
* if there's a delegate, it can be removed
*/
adj = adj_get(ai);
ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
if (NULL != ad)
{
adj_nbr_midchain_unstack(ai);
amd = pool_elt_at_index(amd_pool, ad->ad_index);
fib_entry_untrack(amd->amd_fei, amd->amd_sibling);
pool_put(amd_pool, amd);
adj_delegate_remove (ai, ADJ_DELEGATE_MIDCHAIN);
}
}
void
adj_midchain_delegate_unstack (adj_index_t ai)
{
adj_nbr_midchain_unstack(ai);
}
static void
adj_midchain_delegate_adj_deleted (adj_delegate_t *ad)
{
adj_midchain_delegate_t *amd;
amd = pool_elt_at_index(amd_pool, ad->ad_index);
fib_entry_untrack(amd->amd_fei, amd->amd_sibling);
pool_put(amd_pool, amd);
}
/**
* Print a delegate that represents MIDCHAIN tracking
*/
static u8 *
adj_midchain_delegate_fmt (const adj_delegate_t *aed, u8 *s)
{
const adj_midchain_delegate_t *amd = adj_midchain_from_const_base(aed);
s = format(s, "MIDCHAIN:[fib-entry:%d]", amd->amd_fei);
return (s);
}
const static adj_delegate_vft_t adj_delegate_vft = {
.adv_format = adj_midchain_delegate_fmt,
.adv_adj_deleted = adj_midchain_delegate_adj_deleted,
};
static clib_error_t *
adj_midchain_delegate_module_init (vlib_main_t * vm)
{
clib_error_t * error = NULL;
adj_delegate_register_type (ADJ_DELEGATE_MIDCHAIN, &adj_delegate_vft);
return (error);
}
VLIB_INIT_FUNCTION (adj_midchain_delegate_module_init);
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