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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/fib/fib_entry_cover.h>
#include <vnet/fib/fib_entry_src.h>
#include <vnet/fib/fib_node_list.h>
u32
fib_entry_cover_track (fib_entry_t* cover,
fib_node_index_t covered)
{
fib_entry_delegate_t *fed;
FIB_ENTRY_DBG(cover, "cover-track %d", covered);
ASSERT(fib_entry_get_index(cover) != covered);
fed = fib_entry_delegate_get(cover, FIB_ENTRY_DELEGATE_COVERED);
if (NULL == fed)
{
fed = fib_entry_delegate_find_or_add(cover, FIB_ENTRY_DELEGATE_COVERED);
fed->fd_list = fib_node_list_create();
}
return (fib_node_list_push_front(fed->fd_list,
0, FIB_NODE_TYPE_ENTRY,
covered));
}
void
fib_entry_cover_untrack (fib_entry_t* cover,
u32 tracked_index)
{
fib_entry_delegate_t *fed;
FIB_ENTRY_DBG(cover, "cover-untrack @ %d", tracked_index);
fed = fib_entry_delegate_get(cover, FIB_ENTRY_DELEGATE_COVERED);
if (NULL == fed)
return;
fib_node_list_remove(fed->fd_list, tracked_index);
if (0 == fib_node_list_get_size(fed->fd_list))
{
fib_node_list_destroy(&fed->fd_list);
fib_entry_delegate_remove(cover, FIB_ENTRY_DELEGATE_COVERED);
}
}
/**
* Internal struct to hold user supplied paraneters for the cover walk
*/
typedef struct fib_enty_cover_walk_ctx_t_ {
fib_entry_t *cover;
fib_entry_covered_walk_t walk;
void *ctx;
} fib_enty_cover_walk_ctx_t;
static int
fib_entry_cover_walk_node_ptr (fib_node_ptr_t *depend,
void *args)
{
fib_enty_cover_walk_ctx_t *ctx = args;
ctx->walk(ctx->cover, depend->fnp_index, ctx->ctx);
/* continue */
return (1);
}
void
fib_entry_cover_walk (fib_entry_t *cover,
fib_entry_covered_walk_t walk,
void *args)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(cover, FIB_ENTRY_DELEGATE_COVERED);
if (NULL == fed)
return;
fib_enty_cover_walk_ctx_t ctx = {
.cover = cover,
.walk = walk,
.ctx = args,
};
fib_node_list_walk(fed->fd_list,
fib_entry_cover_walk_node_ptr,
&ctx);
}
static int
fib_entry_cover_change_one (fib_entry_t *cover,
fib_node_index_t covered,
void *args)
{
fib_node_index_t new_cover;
/*
* The 3 entries involved here are:
* cover - the least specific. It will cover both the others
* new_cover - the enty just inserted below the cover
* covered - the entry that was tracking the cover.
*
* The checks below are to determine if new_cover is a cover for covered.
*/
new_cover = pointer_to_uword(args);
if (FIB_NODE_INDEX_INVALID == new_cover)
{
/*
* nothing has been inserted, which implies the cover was removed.
* 'cover' is thus the new cover.
*/
fib_entry_cover_changed(covered);
}
else if (new_cover != covered)
{
const fib_prefix_t *pfx_covered, *pfx_new_cover;
pfx_covered = fib_entry_get_prefix(covered);
pfx_new_cover = fib_entry_get_prefix(new_cover);
if (fib_prefix_is_cover(pfx_new_cover, pfx_covered))
{
fib_entry_cover_changed(covered);
}
}
/* continue */
return (1);
}
void
fib_entry_cover_change_notify (fib_node_index_t cover_index,
fib_node_index_t covered)
{
fib_entry_t *cover;
cover = fib_entry_get(cover_index);
fib_entry_cover_walk(cover,
fib_entry_cover_change_one,
uword_to_pointer(covered, void*));
}
static int
fib_entry_cover_update_one (fib_entry_t *cover,
fib_node_index_t covered,
void *args)
{
fib_entry_cover_updated(covered);
/* continue */
return (1);
}
void
fib_entry_cover_update_notify (fib_entry_t *fib_entry)
{
fib_entry_cover_walk(fib_entry,
fib_entry_cover_update_one,
NULL);
}
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