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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.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_attached_export.h>
#include <vnet/fib/fib_entry_cover.h>
#include <vnet/fib/fib_entry_src.h>
#include <vnet/fib/fib_entry_delegate.h>
/**
* A description of the need to import routes from the export table
*/
typedef struct fib_ae_import_t_
{
/**
* The entry in the epxort table that this importer
* is importing covereds from
*/
fib_node_index_t faei_export_entry;
/**
* The attached entry in the import table
*/
fib_node_index_t faei_import_entry;
/**
* the sibling index on the cover
*/
u32 faei_export_sibling;
/**
* The index of the exporter tracker. Not set if the
* export entry is not valid for export
*/
fib_node_index_t faei_exporter;
/**
* A vector/list of imported entry indicies
*/
fib_node_index_t *faei_importeds;
/**
* The FIB index and prefix we are tracking
*/
fib_node_index_t faei_export_fib;
fib_prefix_t faei_prefix;
/**
* The FIB index we are importing into
*/
fib_node_index_t faei_import_fib;
} fib_ae_import_t;
/**
* A description of the need to export routes to one or more export tables
*/
typedef struct fib_ae_export_t_ {
/**
* The vector/list of import tracker indicies
*/
fib_node_index_t *faee_importers;
/**
* THe connected entry this export is acting on behalf of
*/
fib_node_index_t faee_ei;
/**
* Reference counting locks
*/
u32 faee_locks;
} fib_ae_export_t;
/*
* memory pools for the importers and exportes
*/
static fib_ae_import_t *fib_ae_import_pool;
static fib_ae_export_t *fib_ae_export_pool;
static fib_ae_export_t *
fib_entry_ae_add_or_lock (fib_node_index_t connected)
{
fib_entry_delegate_t *fed;
fib_ae_export_t *export;
fib_entry_t *entry;
entry = fib_entry_get(connected);
fed = fib_entry_delegate_get(entry,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
if (NULL == fed)
{
fed = fib_entry_delegate_find_or_add(entry,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
pool_get(fib_ae_export_pool, export);
memset(export, 0, sizeof(*export));
fed->fd_index = (export - fib_ae_export_pool);
export->faee_ei = connected;
}
else
{
export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
}
export->faee_locks++;
return (export);
}
static void
fib_entry_import_remove (fib_ae_import_t *import,
fib_node_index_t entry_index)
{
fib_prefix_t prefix;
u32 index;
/*
* find the index in the vector of the entry we are removing
*/
index = vec_search(import->faei_importeds, entry_index);
if (index < vec_len(import->faei_importeds))
{
/*
* this is an entry that was previsouly imported
*/
fib_entry_get_prefix(entry_index, &prefix);
fib_table_entry_special_remove(import->faei_import_fib,
&prefix,
FIB_SOURCE_AE);
fib_entry_unlock(entry_index);
vec_del1(import->faei_importeds, index);
}
}
static void
fib_entry_import_add (fib_ae_import_t *import,
fib_node_index_t entry_index)
{
fib_node_index_t *existing;
fib_prefix_t prefix;
/*
* ensure we only add the exported entry once, since
* sourcing prefixes in the table is reference counted
*/
vec_foreach(existing, import->faei_importeds)
{
if (*existing == entry_index)
{
return;
}
}
/*
* this is the first time this export entry has been imported
* Add it to the import FIB and to the list of importeds
*/
fib_entry_get_prefix(entry_index, &prefix);
/*
* don't import entries that have the same prefix the import entry
*/
if (0 != fib_prefix_cmp(&prefix,
&import->faei_prefix))
{
const dpo_id_t *dpo;
dpo = fib_entry_contribute_ip_forwarding(entry_index);
if (dpo_id_is_valid(dpo))
{
fib_table_entry_special_dpo_add(import->faei_import_fib,
&prefix,
FIB_SOURCE_AE,
(fib_entry_get_flags(entry_index) |
FIB_ENTRY_FLAG_EXCLUSIVE),
load_balance_get_bucket(dpo->dpoi_index, 0));
fib_entry_lock(entry_index);
vec_add1(import->faei_importeds, entry_index);
}
/*
* else
* the entry currently has no valid forwarding. when it
* does it will export itself
*/
}
}
/**
* Call back when walking a connected prefix's covered prefixes for import
*/
static int
fib_entry_covered_walk_import (fib_entry_t *cover,
fib_node_index_t covered,
void *ctx)
{
fib_ae_import_t *import = ctx;
fib_entry_import_add(import, covered);
return (0);
}
/*
* fib_entry_ae_import_add
*
* Add an importer to a connected entry
*/
static void
fib_ae_export_import_add (fib_ae_export_t *export,
fib_ae_import_t *import)
{
fib_entry_t *entry;
import->faei_exporter = (export - fib_ae_export_pool);
entry = fib_entry_get(export->faee_ei);
fib_entry_cover_walk(entry,
fib_entry_covered_walk_import,
import);
}
void
fib_attached_export_import (fib_entry_t *fib_entry,
fib_node_index_t export_fib)
{
fib_entry_delegate_t *fed;
fib_ae_import_t *import;
fib_node_index_t fei;
/*
* save index for later post-realloc retreival
*/
fei = fib_entry_get_index(fib_entry);
pool_get(fib_ae_import_pool, import);
import->faei_import_fib = fib_entry->fe_fib_index;
import->faei_export_fib = export_fib;
import->faei_prefix = fib_entry->fe_prefix;
import->faei_import_entry = fib_entry_get_index(fib_entry);
import->faei_export_sibling = ~0;
/*
* do an exact match in the export table
*/
import->faei_export_entry =
fib_table_lookup_exact_match(import->faei_export_fib,
&import->faei_prefix);
if (FIB_NODE_INDEX_INVALID == import->faei_export_entry)
{
/*
* no exact matching entry in the export table. can't be good.
* track the next best thing
*/
import->faei_export_entry =
fib_table_lookup(import->faei_export_fib,
&import->faei_prefix);
import->faei_exporter = FIB_NODE_INDEX_INVALID;
}
else
{
/*
* found the entry in the export table. import the
* the prefixes that it covers.
* only if the prefix found in the export FIB really is
* attached do we want to import its covered
*/
if (FIB_ENTRY_FLAG_ATTACHED &
fib_entry_get_flags_i(fib_entry_get(import->faei_export_entry)))
{
fib_ae_export_t *export;
export = fib_entry_ae_add_or_lock(import->faei_export_entry);
vec_add1(export->faee_importers, (import - fib_ae_import_pool));
fib_ae_export_import_add(export, import);
}
}
/*
* track the entry in the export table so we can update appropriately
* when it changes.
* Exporting prefixes will have allocated new fib_entry_t objects, so the pool
* may have realloc'd.
*/
fib_entry = fib_entry_get(fei);
import->faei_export_sibling =
fib_entry_cover_track(fib_entry_get(import->faei_export_entry), fei);
fed = fib_entry_delegate_find_or_add(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
fed->fd_index = (import - fib_ae_import_pool);
}
/**
* \brief All the imported entries need to be pruged
*/
void
fib_attached_export_purge (fib_entry_t *fib_entry)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
if (NULL != fed)
{
fib_node_index_t *import_index;
fib_entry_t *export_entry;
fib_ae_import_t *import;
fib_ae_export_t *export;
import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
/*
* remove each imported entry
*/
vec_foreach(import_index, import->faei_importeds)
{
fib_prefix_t prefix;
fib_entry_get_prefix(*import_index, &prefix);
fib_table_entry_delete(import->faei_import_fib,
&prefix,
FIB_SOURCE_AE);
fib_entry_unlock(*import_index);
}
vec_free(import->faei_importeds);
/*
* stop tracking the export entry
*/
if (~0 != import->faei_export_sibling)
{
fib_entry_cover_untrack(fib_entry_get(import->faei_export_entry),
import->faei_export_sibling);
}
import->faei_export_sibling = ~0;
/*
* remove this import tracker from the export's list,
* if it is attached to one. It won't be in the case the tracked
* export entry is not an attached exact match.
*/
if (FIB_NODE_INDEX_INVALID != import->faei_exporter)
{
fib_entry_delegate_t *fed;
export_entry = fib_entry_get(import->faei_export_entry);
fed = fib_entry_delegate_get(export_entry,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
ASSERT(NULL != fed);
export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
u32 index = vec_search(export->faee_importers,
(import - fib_ae_import_pool));
ASSERT(index < vec_len(export->faee_importers));
vec_del1(export->faee_importers, index);
/*
* free the exporter if there are no longer importers
*/
if (0 == --export->faee_locks)
{
pool_put(fib_ae_export_pool, export);
fib_entry_delegate_remove(export_entry,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
}
}
/*
* free the import tracker
*/
pool_put(fib_ae_import_pool, import);
fib_entry_delegate_remove(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
}
}
void
fib_attached_export_covered_added (fib_entry_t *cover,
fib_node_index_t covered)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(cover,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
if (NULL != fed)
{
/*
* the covering prefix is exporting to other tables
*/
fib_node_index_t *import_index;
fib_ae_import_t *import;
fib_ae_export_t *export;
export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
/*
* export the covered entry to each of the importers
*/
vec_foreach(import_index, export->faee_importers)
{
import = pool_elt_at_index(fib_ae_import_pool, *import_index);
fib_entry_import_add(import, covered);
}
}
}
void
fib_attached_export_covered_removed (fib_entry_t *cover,
fib_node_index_t covered)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(cover,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
if (NULL != fed)
{
/*
* the covering prefix is exporting to other tables
*/
fib_node_index_t *import_index;
fib_ae_import_t *import;
fib_ae_export_t *export;
export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
/*
* remove the covered entry from each of the importers
*/
vec_foreach(import_index, export->faee_importers)
{
import = pool_elt_at_index(fib_ae_import_pool, *import_index);
fib_entry_import_remove(import, covered);
}
}
}
static void
fib_attached_export_cover_modified_i (fib_entry_t *fib_entry)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
if (NULL != fed)
{
fib_ae_import_t *import;
u32 export_fib;
/*
* safe the temporaries we need from the existing import
* since it will be toast after the purge.
*/
import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
export_fib = import->faei_export_fib;
/*
* keep it simple. purge anything that was previously imported.
* then re-evaluate the need to import.
*/
fib_attached_export_purge(fib_entry);
fib_attached_export_import(fib_entry, export_fib);
}
}
/**
* \brief If this entry is tracking a cover (in another table)
* then that cover has changed. re-evaluate import.
*/
void
fib_attached_export_cover_change (fib_entry_t *fib_entry)
{
fib_attached_export_cover_modified_i(fib_entry);
}
/**
* \brief If this entry is tracking a cover (in another table)
* then that cover has been updated. re-evaluate import.
*/
void
fib_attached_export_cover_update (fib_entry_t *fib_entry)
{
fib_attached_export_cover_modified_i(fib_entry);
}
u8*
fib_ae_import_format (fib_entry_t *fib_entry,
u8* s)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
if (NULL != fed)
{
fib_node_index_t *index;
fib_ae_import_t *import;
import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
s = format(s, "\n Attached-Import:%d:[", (import - fib_ae_import_pool));
s = format(s, "export-prefix:%U ", format_fib_prefix, &import->faei_prefix);
s = format(s, "export-entry:%d ", import->faei_export_entry);
s = format(s, "export-sibling:%d ", import->faei_export_sibling);
s = format(s, "exporter:%d ", import->faei_exporter);
s = format(s, "export-fib:%d ", import->faei_export_fib);
s = format(s, "import-entry:%d ", import->faei_import_entry);
s = format(s, "import-fib:%d ", import->faei_import_fib);
s = format(s, "importeds:[");
vec_foreach(index, import->faei_importeds)
{
s = format(s, "%d, ", *index);
}
s = format(s, "]]");
}
return (s);
}
u8*
fib_ae_export_format (fib_entry_t *fib_entry,
u8* s)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(fib_entry,
FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
if (NULL != fed)
{
fib_node_index_t *index;
fib_ae_export_t *export;
export = pool_elt_at_index(fib_ae_export_pool, fed->fd_list);
s = format(s, "\n Attached-Export:%d:[", (export - fib_ae_export_pool));
s = format(s, "export-entry:%d ", export->faee_ei);
s = format(s, "importers:[");
vec_foreach(index, export->faee_importers)
{
s = format(s, "%d, ", *index);
}
s = format(s, "]]");
}
return (s);
}