2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/fib/fib_entry.h>
17 #include <vnet/fib/fib_table.h>
19 #include <vnet/fib/fib_attached_export.h>
20 #include <vnet/fib/fib_entry_cover.h>
21 #include <vnet/fib/fib_entry_src.h>
22 #include <vnet/fib/fib_entry_delegate.h>
25 * A description of the need to import routes from the export table
27 typedef struct fib_ae_import_t_
30 * The entry in the epxort table that this importer
31 * is importing covereds from
33 fib_node_index_t faei_export_entry;
36 * The attached entry in the import table
38 fib_node_index_t faei_import_entry;
40 * the sibling index on the cover
42 u32 faei_export_sibling;
45 * The index of the exporter tracker. Not set if the
46 * export entry is not valid for export
48 fib_node_index_t faei_exporter;
51 * A vector/list of imported entry indicies
53 fib_node_index_t *faei_importeds;
56 * The FIB index and prefix we are tracking
58 fib_node_index_t faei_export_fib;
59 fib_prefix_t faei_prefix;
62 * The FIB index we are importing into
64 fib_node_index_t faei_import_fib;
68 * A description of the need to export routes to one or more export tables
70 typedef struct fib_ae_export_t_ {
72 * The vector/list of import tracker indicies
74 fib_node_index_t *faee_importers;
77 * THe connected entry this export is acting on behalf of
79 fib_node_index_t faee_ei;
82 * Reference counting locks
88 * memory pools for the importers and exportes
90 static fib_ae_import_t *fib_ae_import_pool;
91 static fib_ae_export_t *fib_ae_export_pool;
93 static fib_ae_export_t *
94 fib_entry_ae_add_or_lock (fib_node_index_t connected)
96 fib_entry_delegate_t *fed;
97 fib_ae_export_t *export;
100 entry = fib_entry_get(connected);
101 fed = fib_entry_delegate_get(entry,
102 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
106 fed = fib_entry_delegate_find_or_add(entry,
107 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
108 pool_get(fib_ae_export_pool, export);
109 memset(export, 0, sizeof(*export));
111 fed->fd_index = (export - fib_ae_export_pool);
112 export->faee_ei = connected;
116 export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
119 export->faee_locks++;
125 fib_entry_import_remove (fib_ae_import_t *import,
126 fib_node_index_t entry_index)
132 * find the index in the vector of the entry we are removing
134 index = vec_search(import->faei_importeds, entry_index);
136 if (index < vec_len(import->faei_importeds))
139 * this is an entry that was previsouly imported
141 fib_entry_get_prefix(entry_index, &prefix);
143 fib_table_entry_special_remove(import->faei_import_fib,
147 fib_entry_unlock(entry_index);
148 vec_del1(import->faei_importeds, index);
153 fib_entry_import_add (fib_ae_import_t *import,
154 fib_node_index_t entry_index)
156 fib_node_index_t *existing;
160 * ensure we only add the exported entry once, since
161 * sourcing prefixes in the table is reference counted
163 vec_foreach(existing, import->faei_importeds)
165 if (*existing == entry_index)
172 * this is the first time this export entry has been imported
173 * Add it to the import FIB and to the list of importeds
175 fib_entry_get_prefix(entry_index, &prefix);
178 * don't import entries that have the same prefix the import entry
180 if (0 != fib_prefix_cmp(&prefix,
181 &import->faei_prefix))
185 dpo = fib_entry_contribute_ip_forwarding(entry_index);
187 if (dpo_id_is_valid(dpo))
189 fib_table_entry_special_dpo_add(import->faei_import_fib,
192 FIB_ENTRY_FLAG_EXCLUSIVE,
193 load_balance_get_bucket(dpo->dpoi_index, 0));
195 fib_entry_lock(entry_index);
196 vec_add1(import->faei_importeds, entry_index);
200 * the entry currently has no valid forwarding. when it
201 * does it will export itself
207 * Call back when walking a connected prefix's covered prefixes for import
210 fib_entry_covered_walk_import (fib_entry_t *cover,
211 fib_node_index_t covered,
214 fib_ae_import_t *import = ctx;
216 fib_entry_import_add(import, covered);
222 * fib_entry_ae_import_add
224 * Add an importer to a connected entry
227 fib_ae_export_import_add (fib_ae_export_t *export,
228 fib_ae_import_t *import)
232 import->faei_exporter = (export - fib_ae_export_pool);
233 entry = fib_entry_get(export->faee_ei);
235 fib_entry_cover_walk(entry,
236 fib_entry_covered_walk_import,
241 fib_attached_export_import (fib_entry_t *fib_entry,
242 fib_node_index_t export_fib)
244 fib_entry_delegate_t *fed;
245 fib_ae_import_t *import;
247 pool_get(fib_ae_import_pool, import);
249 import->faei_import_fib = fib_entry->fe_fib_index;
250 import->faei_export_fib = export_fib;
251 import->faei_prefix = fib_entry->fe_prefix;
252 import->faei_import_entry = fib_entry_get_index(fib_entry);
253 import->faei_export_sibling = ~0;
256 * do an exact match in the export table
258 import->faei_export_entry =
259 fib_table_lookup_exact_match(import->faei_export_fib,
260 &import->faei_prefix);
262 if (FIB_NODE_INDEX_INVALID == import->faei_export_entry)
265 * no exact matching entry in the export table. can't be good.
266 * track the next best thing
268 import->faei_export_entry =
269 fib_table_lookup(import->faei_export_fib,
270 &import->faei_prefix);
271 import->faei_exporter = FIB_NODE_INDEX_INVALID;
276 * found the entry in the export table. import the
277 * the prefixes that it covers.
278 * only if the prefix found in the export FIB really is
279 * attached do we want to import its covered
281 if (FIB_ENTRY_FLAG_ATTACHED &
282 fib_entry_get_flags_i(fib_entry_get(import->faei_export_entry)))
284 fib_ae_export_t *export;
286 export = fib_entry_ae_add_or_lock(import->faei_export_entry);
287 vec_add1(export->faee_importers, (import - fib_ae_import_pool));
288 fib_ae_export_import_add(export, import);
293 * track the entry in the export table so we can update appropriately
296 import->faei_export_sibling =
297 fib_entry_cover_track(fib_entry_get(import->faei_export_entry),
298 fib_entry_get_index(fib_entry));
300 fed = fib_entry_delegate_find_or_add(fib_entry,
301 FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
302 fed->fd_index = (import - fib_ae_import_pool);
306 * \brief All the imported entries need to be pruged
309 fib_attached_export_purge (fib_entry_t *fib_entry)
311 fib_entry_delegate_t *fed;
313 fed = fib_entry_delegate_get(fib_entry,
314 FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
318 fib_node_index_t *import_index;
319 fib_entry_t *export_entry;
320 fib_ae_import_t *import;
321 fib_ae_export_t *export;
323 import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
326 * remove each imported entry
328 vec_foreach(import_index, import->faei_importeds)
332 fib_entry_get_prefix(*import_index, &prefix);
334 fib_table_entry_delete(import->faei_import_fib,
337 fib_entry_unlock(*import_index);
339 vec_free(import->faei_importeds);
342 * stop tracking the export entry
344 if (~0 != import->faei_export_sibling)
346 fib_entry_cover_untrack(fib_entry_get(import->faei_export_entry),
347 import->faei_export_sibling);
349 import->faei_export_sibling = ~0;
352 * remove this import tracker from the export's list,
353 * if it is attached to one. It won't be in the case the tracked
354 * export entry is not an attached exact match.
356 if (FIB_NODE_INDEX_INVALID != import->faei_exporter)
358 fib_entry_delegate_t *fed;
360 export_entry = fib_entry_get(import->faei_export_entry);
362 fed = fib_entry_delegate_get(export_entry,
363 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
366 export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
368 u32 index = vec_search(export->faee_importers,
369 (import - fib_ae_import_pool));
371 ASSERT(index < vec_len(export->faee_importers));
372 vec_del1(export->faee_importers, index);
375 * free the exporter if there are no longer importers
377 if (0 == --export->faee_locks)
379 pool_put(fib_ae_export_pool, export);
380 fib_entry_delegate_remove(export_entry,
381 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
386 * free the import tracker
388 pool_put(fib_ae_import_pool, import);
389 fib_entry_delegate_remove(fib_entry,
390 FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
395 fib_attached_export_covered_added (fib_entry_t *cover,
396 fib_node_index_t covered)
398 fib_entry_delegate_t *fed;
400 fed = fib_entry_delegate_get(cover,
401 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
406 * the covering prefix is exporting to other tables
408 fib_node_index_t *import_index;
409 fib_ae_import_t *import;
410 fib_ae_export_t *export;
412 export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
415 * export the covered entry to each of the importers
417 vec_foreach(import_index, export->faee_importers)
419 import = pool_elt_at_index(fib_ae_import_pool, *import_index);
421 fib_entry_import_add(import, covered);
427 fib_attached_export_covered_removed (fib_entry_t *cover,
428 fib_node_index_t covered)
430 fib_entry_delegate_t *fed;
432 fed = fib_entry_delegate_get(cover,
433 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
438 * the covering prefix is exporting to other tables
440 fib_node_index_t *import_index;
441 fib_ae_import_t *import;
442 fib_ae_export_t *export;
444 export = pool_elt_at_index(fib_ae_export_pool, fed->fd_index);
447 * remove the covered entry from each of the importers
449 vec_foreach(import_index, export->faee_importers)
451 import = pool_elt_at_index(fib_ae_import_pool, *import_index);
453 fib_entry_import_remove(import, covered);
459 fib_attached_export_cover_modified_i (fib_entry_t *fib_entry)
461 fib_entry_delegate_t *fed;
463 fed = fib_entry_delegate_get(fib_entry,
464 FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
468 fib_ae_import_t *import;
472 * safe the temporaries we need from the existing import
473 * since it will be toast after the purge.
475 import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
476 export_fib = import->faei_export_fib;
479 * keep it simple. purge anything that was previously imported.
480 * then re-evaluate the need to import.
482 fib_attached_export_purge(fib_entry);
483 fib_attached_export_import(fib_entry, export_fib);
488 * \brief If this entry is tracking a cover (in another table)
489 * then that cover has changed. re-evaluate import.
492 fib_attached_export_cover_change (fib_entry_t *fib_entry)
494 fib_attached_export_cover_modified_i(fib_entry);
498 * \brief If this entry is tracking a cover (in another table)
499 * then that cover has been updated. re-evaluate import.
502 fib_attached_export_cover_update (fib_entry_t *fib_entry)
504 fib_attached_export_cover_modified_i(fib_entry);
508 fib_ae_import_format (fib_entry_t *fib_entry,
511 fib_entry_delegate_t *fed;
513 fed = fib_entry_delegate_get(fib_entry,
514 FIB_ENTRY_DELEGATE_ATTACHED_IMPORT);
518 fib_node_index_t *index;
519 fib_ae_import_t *import;
521 import = pool_elt_at_index(fib_ae_import_pool, fed->fd_index);
523 s = format(s, "\n Attached-Import:%d:[", (import - fib_ae_import_pool));
524 s = format(s, "export-prefix:%U ", format_fib_prefix, &import->faei_prefix);
525 s = format(s, "export-entry:%d ", import->faei_export_entry);
526 s = format(s, "export-sibling:%d ", import->faei_export_sibling);
527 s = format(s, "exporter:%d ", import->faei_exporter);
528 s = format(s, "export-fib:%d ", import->faei_export_fib);
530 s = format(s, "import-entry:%d ", import->faei_import_entry);
531 s = format(s, "import-fib:%d ", import->faei_import_fib);
533 s = format(s, "importeds:[");
534 vec_foreach(index, import->faei_importeds)
536 s = format(s, "%d, ", *index);
545 fib_ae_export_format (fib_entry_t *fib_entry,
548 fib_entry_delegate_t *fed;
550 fed = fib_entry_delegate_get(fib_entry,
551 FIB_ENTRY_DELEGATE_ATTACHED_EXPORT);
555 fib_node_index_t *index;
556 fib_ae_export_t *export;
558 export = pool_elt_at_index(fib_ae_export_pool, fed->fd_list);
560 s = format(s, "\n Attached-Export:%d:[", (export - fib_ae_export_pool));
561 s = format(s, "export-entry:%d ", export->faee_ei);
563 s = format(s, "importers:[");
564 vec_foreach(index, export->faee_importers)
566 s = format(s, "%d, ", *index);