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 <vlib/vlib.h>
17 #include <vnet/ip/format.h>
18 #include <vnet/ip/lookup.h>
19 #include <vnet/adj/adj.h>
20 #include <vnet/dpo/load_balance.h>
21 #include <vnet/dpo/drop_dpo.h>
23 #include <vnet/fib/fib_entry.h>
24 #include <vnet/fib/fib_walk.h>
25 #include <vnet/fib/fib_entry_src.h>
26 #include <vnet/fib/fib_entry_cover.h>
27 #include <vnet/fib/fib_table.h>
28 #include <vnet/fib/fib_internal.h>
29 #include <vnet/fib/fib_attached_export.h>
30 #include <vnet/fib/fib_path_ext.h>
31 #include <vnet/fib/fib_entry_delegate.h>
32 #include <vnet/fib/fib_entry_track.h>
35 * Array of strings/names for the FIB sources
37 static const char *fib_source_names[] = FIB_SOURCES;
38 static const char *fib_attribute_names[] = FIB_ENTRY_ATTRIBUTES;
39 static const char *fib_src_attribute_names[] = FIB_ENTRY_SRC_ATTRIBUTES;
42 * Pool for all fib_entries
44 static fib_entry_t *fib_entry_pool;
49 vlib_log_class_t fib_entry_logger;
52 fib_entry_get (fib_node_index_t index)
54 return (pool_elt_at_index(fib_entry_pool, index));
58 fib_entry_get_node (fib_node_index_t index)
60 return ((fib_node_t*)fib_entry_get(index));
64 fib_entry_get_index (const fib_entry_t * fib_entry)
66 return (fib_entry - fib_entry_pool);
70 fib_entry_get_proto (const fib_entry_t * fib_entry)
72 return (fib_entry->fe_prefix.fp_proto);
76 fib_entry_get_dpo_proto (const fib_entry_t * fib_entry)
78 return (fib_proto_to_dpo(fib_entry->fe_prefix.fp_proto));
81 fib_forward_chain_type_t
82 fib_entry_get_default_chain_type (const fib_entry_t *fib_entry)
84 switch (fib_entry->fe_prefix.fp_proto)
86 case FIB_PROTOCOL_IP4:
87 return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
88 case FIB_PROTOCOL_IP6:
89 return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6);
90 case FIB_PROTOCOL_MPLS:
91 if (MPLS_EOS == fib_entry->fe_prefix.fp_eos)
92 return (FIB_FORW_CHAIN_TYPE_MPLS_EOS);
94 return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
97 return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
101 format_fib_source (u8 * s, va_list * args)
103 fib_source_t source = va_arg (*args, int);
105 s = format (s, "src:%s", fib_source_names[source]);
111 format_fib_entry_flags (u8 *s, va_list *args)
113 fib_entry_attribute_t attr;
114 fib_entry_flag_t flag = va_arg(*args, int);
116 FOR_EACH_FIB_ATTRIBUTE(attr) {
117 if ((1<<attr) & flag) {
118 s = format (s, "%s,", fib_attribute_names[attr]);
126 format_fib_entry_src_flags (u8 *s, va_list *args)
128 fib_entry_src_attribute_t sattr;
129 fib_entry_src_flag_t flag = va_arg(*args, int);
131 FOR_EACH_FIB_SRC_ATTRIBUTE(sattr) {
132 if ((1<<sattr) & flag) {
133 s = format (s, "%s,", fib_src_attribute_names[sattr]);
141 format_fib_entry (u8 * s, va_list * args)
143 fib_forward_chain_type_t fct;
144 fib_entry_t *fib_entry;
145 fib_entry_src_t *src;
146 fib_node_index_t fei;
150 fei = va_arg (*args, fib_node_index_t);
151 level = va_arg (*args, int);
152 fib_entry = fib_entry_get(fei);
154 s = format (s, "%U", format_fib_prefix, &fib_entry->fe_prefix);
156 if (level >= FIB_ENTRY_FORMAT_DETAIL)
158 s = format (s, " fib:%d", fib_entry->fe_fib_index);
159 s = format (s, " index:%d", fib_entry_get_index(fib_entry));
160 s = format (s, " locks:%d", fib_entry->fe_node.fn_locks);
162 FOR_EACH_SRC_ADDED(fib_entry, src, source,
164 s = format (s, "\n %U", format_fib_source, source);
165 s = format (s, " refs:%d", src->fes_ref_count);
166 if (FIB_ENTRY_FLAG_NONE != src->fes_entry_flags) {
167 s = format(s, " entry-flags:%U",
168 format_fib_entry_flags, src->fes_entry_flags);
170 if (FIB_ENTRY_SRC_FLAG_NONE != src->fes_flags) {
171 s = format(s, " src-flags:%U",
172 format_fib_entry_src_flags, src->fes_flags);
174 s = fib_entry_src_format(fib_entry, source, s);
175 s = format (s, "\n");
176 if (FIB_NODE_INDEX_INVALID != src->fes_pl)
178 s = fib_path_list_format(src->fes_pl, s);
180 s = format(s, "%U", format_fib_path_ext_list, &src->fes_path_exts);
183 s = format (s, "\n forwarding: ");
187 s = format (s, "\n");
190 fct = fib_entry_get_default_chain_type(fib_entry);
192 if (!dpo_id_is_valid(&fib_entry->fe_lb))
194 s = format (s, " UNRESOLVED\n");
199 s = format(s, " %U-chain\n %U",
200 format_fib_forw_chain_type, fct,
206 if (level >= FIB_ENTRY_FORMAT_DETAIL2)
210 s = format (s, " Delegates:\n");
211 vec_foreach(fedi, fib_entry->fe_delegates)
213 s = format(s, " %U\n", format_fib_entry_delegate, *fedi);
218 if (level >= FIB_ENTRY_FORMAT_DETAIL2)
220 s = format(s, " Children:");
221 s = fib_node_children_format(fib_entry->fe_node.fn_children, s);
228 fib_entry_from_fib_node (fib_node_t *node)
230 ASSERT(FIB_NODE_TYPE_ENTRY == node->fn_type);
231 return ((fib_entry_t*)node);
235 fib_entry_last_lock_gone (fib_node_t *node)
237 fib_entry_delegate_type_t fdt;
238 fib_entry_delegate_t *fed;
239 fib_entry_t *fib_entry;
241 fib_entry = fib_entry_from_fib_node(node);
243 ASSERT(!dpo_id_is_valid(&fib_entry->fe_lb));
245 FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
247 dpo_reset(&fed->fd_dpo);
248 fib_entry_delegate_remove(fib_entry, fdt);
251 FIB_ENTRY_DBG(fib_entry, "last-lock");
253 fib_node_deinit(&fib_entry->fe_node);
255 ASSERT(0 == vec_len(fib_entry->fe_delegates));
256 vec_free(fib_entry->fe_delegates);
257 vec_free(fib_entry->fe_srcs);
258 pool_put(fib_entry_pool, fib_entry);
261 static fib_entry_src_t*
262 fib_entry_get_best_src_i (const fib_entry_t *fib_entry)
264 fib_entry_src_t *bsrc;
267 * the enum of sources is deliberately arranged in priority order
269 if (0 == vec_len(fib_entry->fe_srcs))
275 bsrc = vec_elt_at_index(fib_entry->fe_srcs, 0);
282 fib_entry_src_get_source (const fib_entry_src_t *esrc)
286 return (esrc->fes_src);
288 return (FIB_SOURCE_MAX);
291 static fib_entry_flag_t
292 fib_entry_src_get_flags (const fib_entry_src_t *esrc)
296 return (esrc->fes_entry_flags);
298 return (FIB_ENTRY_FLAG_NONE);
302 fib_entry_get_flags (fib_node_index_t fib_entry_index)
304 return (fib_entry_get_flags_i(fib_entry_get(fib_entry_index)));
308 * fib_entry_back_walk_notify
310 * A back walk has reach this entry.
312 static fib_node_back_walk_rc_t
313 fib_entry_back_walk_notify (fib_node_t *node,
314 fib_node_back_walk_ctx_t *ctx)
316 fib_entry_t *fib_entry;
318 fib_entry = fib_entry_from_fib_node(node);
320 if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason ||
321 FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason ||
322 FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason ||
323 FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason ||
324 FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason ||
325 FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
327 fib_entry_src_action_reactivate(fib_entry,
328 fib_entry_get_best_source(
329 fib_entry_get_index(fib_entry)));
333 * all other walk types can be reclassifed to a re-evaluate to
334 * all recursive dependents.
335 * By reclassifying we ensure that should any of these walk types meet
336 * they can be merged.
338 ctx->fnbw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE;
341 * ... and nothing is forced sync from now on.
343 ctx->fnbw_flags &= ~FIB_NODE_BW_FLAG_FORCE_SYNC;
345 FIB_ENTRY_DBG(fib_entry, "bw:%U",
346 format_fib_node_bw_reason, ctx->fnbw_reason);
349 * propagate the backwalk further if we haven't already reached the
352 fib_walk_sync(FIB_NODE_TYPE_ENTRY,
353 fib_entry_get_index(fib_entry),
356 return (FIB_NODE_BACK_WALK_CONTINUE);
360 fib_entry_show_memory (void)
362 u32 n_srcs = 0, n_exts = 0;
363 fib_entry_src_t *esrc;
366 fib_show_memory_usage("Entry",
367 pool_elts(fib_entry_pool),
368 pool_len(fib_entry_pool),
369 sizeof(fib_entry_t));
371 pool_foreach(entry, fib_entry_pool,
373 n_srcs += vec_len(entry->fe_srcs);
374 vec_foreach(esrc, entry->fe_srcs)
376 n_exts += fib_path_ext_list_length(&esrc->fes_path_exts);
380 fib_show_memory_usage("Entry Source",
381 n_srcs, n_srcs, sizeof(fib_entry_src_t));
382 fib_show_memory_usage("Entry Path-Extensions",
384 sizeof(fib_path_ext_t));
388 * The FIB path-list's graph node virtual function table
390 static const fib_node_vft_t fib_entry_vft = {
391 .fnv_get = fib_entry_get_node,
392 .fnv_last_lock = fib_entry_last_lock_gone,
393 .fnv_back_walk = fib_entry_back_walk_notify,
394 .fnv_mem_show = fib_entry_show_memory,
398 * @brief Contribute the set of Adjacencies that this entry forwards with
399 * to build the uRPF list of its children
402 fib_entry_contribute_urpf (fib_node_index_t entry_index,
405 fib_entry_t *fib_entry;
407 fib_entry = fib_entry_get(entry_index);
409 return (fib_path_list_contribute_urpf(fib_entry->fe_parent, urpf));
413 * If the client is request a chain for multicast forwarding then swap
414 * the chain type to one that can provide such transport.
416 static fib_forward_chain_type_t
417 fib_entry_chain_type_mcast_to_ucast (fib_forward_chain_type_t fct)
421 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
422 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
424 * we can only transport IP multicast packets if there is an
427 fct = FIB_FORW_CHAIN_TYPE_MPLS_EOS;
429 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
430 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
431 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
432 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
433 case FIB_FORW_CHAIN_TYPE_ETHERNET:
434 case FIB_FORW_CHAIN_TYPE_NSH:
435 case FIB_FORW_CHAIN_TYPE_BIER:
443 * fib_entry_contribute_forwarding
445 * Get an lock the forwarding information (DPO) contributed by the FIB entry.
448 fib_entry_contribute_forwarding (fib_node_index_t fib_entry_index,
449 fib_forward_chain_type_t fct,
452 fib_entry_delegate_t *fed;
453 fib_entry_t *fib_entry;
455 fib_entry = fib_entry_get(fib_entry_index);
458 * mfib children ask for mcast chains. fix these to the appropriate ucast types.
460 fct = fib_entry_chain_type_mcast_to_ucast(fct);
462 if (fct == fib_entry_get_default_chain_type(fib_entry))
464 dpo_copy(dpo, &fib_entry->fe_lb);
468 fed = fib_entry_delegate_find(fib_entry,
469 fib_entry_chain_type_to_delegate_type(fct));
474 * use a temporary DPO lest the delegate realloc in the recursive
477 dpo_id_t tmp = DPO_INVALID;
480 * on-demand create eos/non-eos.
481 * There is no on-demand delete because:
482 * - memory versus complexity & reliability:
483 * leaving unrequired [n]eos LB arounds wastes memory, cleaning
484 * then up on the right trigger is more code. i favour the latter.
486 fib_entry_src_mk_lb(fib_entry,
487 fib_entry_get_best_src_i(fib_entry),
491 fed = fib_entry_delegate_find_or_add(
493 fib_entry_chain_type_to_delegate_type(fct));
495 dpo_copy(&fed->fd_dpo, &tmp);
499 dpo_copy(dpo, &fed->fd_dpo);
502 * use the drop DPO is nothing else is present
504 if (!dpo_id_is_valid(dpo))
506 dpo_copy(dpo, drop_dpo_get(fib_forw_chain_type_to_dpo_proto(fct)));
510 * don't allow the special index indicating replicate.vs.load-balance
511 * to escape to the clients
513 dpo->dpoi_index &= ~MPLS_IS_REPLICATE;
517 fib_entry_contribute_ip_forwarding (fib_node_index_t fib_entry_index)
519 fib_forward_chain_type_t fct;
520 fib_entry_t *fib_entry;
522 fib_entry = fib_entry_get(fib_entry_index);
523 fct = fib_entry_get_default_chain_type(fib_entry);
525 ASSERT((fct == FIB_FORW_CHAIN_TYPE_UNICAST_IP4 ||
526 fct == FIB_FORW_CHAIN_TYPE_UNICAST_IP6));
528 if (dpo_id_is_valid(&fib_entry->fe_lb))
530 return (&fib_entry->fe_lb);
533 return (drop_dpo_get(fib_forw_chain_type_to_dpo_proto(fct)));
537 fib_entry_get_adj (fib_node_index_t fib_entry_index)
541 dpo = fib_entry_contribute_ip_forwarding(fib_entry_index);
543 if (dpo_id_is_valid(dpo))
545 dpo = load_balance_get_bucket(dpo->dpoi_index, 0);
549 return (dpo->dpoi_index);
552 return (ADJ_INDEX_INVALID);
556 fib_entry_get_path_list (fib_node_index_t fib_entry_index)
558 fib_entry_t *fib_entry;
560 fib_entry = fib_entry_get(fib_entry_index);
562 return (fib_entry->fe_parent);
566 fib_entry_child_add (fib_node_index_t fib_entry_index,
567 fib_node_type_t child_type,
568 fib_node_index_t child_index)
570 return (fib_node_child_add(FIB_NODE_TYPE_ENTRY,
577 fib_entry_child_remove (fib_node_index_t fib_entry_index,
580 fib_node_child_remove(FIB_NODE_TYPE_ENTRY,
584 if (0 == fib_node_get_n_children(FIB_NODE_TYPE_ENTRY,
588 * if there are no children left then there is no reason to keep
589 * the non-default forwarding chains. those chains are built only
590 * because the children want them.
592 fib_entry_delegate_type_t fdt;
593 fib_entry_delegate_t *fed;
594 fib_entry_t *fib_entry;
596 fib_entry = fib_entry_get(fib_entry_index);
598 FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
600 dpo_reset(&fed->fd_dpo);
601 fib_entry_delegate_remove(fib_entry, fdt);
607 fib_entry_alloc (u32 fib_index,
608 const fib_prefix_t *prefix,
609 fib_node_index_t *fib_entry_index)
611 fib_entry_t *fib_entry;
614 pool_get(fib_entry_pool, fib_entry);
615 clib_memset(fib_entry, 0, sizeof(*fib_entry));
617 fib_node_init(&fib_entry->fe_node,
618 FIB_NODE_TYPE_ENTRY);
620 fib_entry->fe_fib_index = fib_index;
623 * the one time we need to update the const prefix is when
624 * the entry is first created
626 fep = (fib_prefix_t*)&(fib_entry->fe_prefix);
629 if (FIB_PROTOCOL_MPLS == fib_entry->fe_prefix.fp_proto)
632 if (MPLS_NON_EOS == fep->fp_eos)
634 fep->fp_payload_proto = DPO_PROTO_MPLS;
636 ASSERT(DPO_PROTO_NONE != fib_entry->fe_prefix.fp_payload_proto);
639 dpo_reset(&fib_entry->fe_lb);
641 *fib_entry_index = fib_entry_get_index(fib_entry);
647 fib_entry_post_flag_update_actions (fib_entry_t *fib_entry,
648 fib_entry_flag_t old_flags)
650 fib_node_index_t fei;
653 * save the index so we can recover from pool reallocs
655 fei = fib_entry_get_index(fib_entry);
658 * handle changes to attached export for import entries
660 int is_import = (FIB_ENTRY_FLAG_IMPORT & fib_entry_get_flags_i(fib_entry));
661 int was_import = (FIB_ENTRY_FLAG_IMPORT & old_flags);
663 if (!was_import && is_import)
666 * transition from not exported to exported
670 * there is an assumption here that the entry resolves via only
671 * one interface and that it is the cross VRF interface.
673 u32 sw_if_index = fib_path_list_get_resolving_interface(fib_entry->fe_parent);
675 fib_attached_export_import(fib_entry,
676 fib_table_get_index_for_sw_if_index(
677 fib_entry_get_proto(fib_entry),
680 else if (was_import && !is_import)
683 * transition from exported to not exported
685 fib_attached_export_purge(fib_entry);
689 * no change. nothing to do.
693 * reload the entry address post possible pool realloc
695 fib_entry = fib_entry_get(fei);
698 * handle changes to attached export for export entries
700 int is_attached = (FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags_i(fib_entry));
701 int was_attached = (FIB_ENTRY_FLAG_ATTACHED & old_flags);
703 if (!was_attached && is_attached)
706 * transition to attached. time to export
716 fib_entry_post_install_actions (fib_entry_t *fib_entry,
718 fib_entry_flag_t old_flags)
720 fib_entry = fib_entry_post_flag_update_actions(fib_entry,
722 fib_entry_src_action_installed(fib_entry, source);
726 fib_entry_create (u32 fib_index,
727 const fib_prefix_t *prefix,
729 fib_entry_flag_t flags,
730 const fib_route_path_t *paths)
732 fib_node_index_t fib_entry_index;
733 fib_entry_t *fib_entry;
735 ASSERT(0 < vec_len(paths));
737 fib_entry = fib_entry_alloc(fib_index, prefix, &fib_entry_index);
740 * since this is a new entry create, we don't need to check for winning
741 * sources - there is only one.
743 fib_entry = fib_entry_src_action_add(fib_entry, source, flags,
746 fib_entry_get_proto(fib_entry))));
747 fib_entry_src_action_path_swap(fib_entry,
752 * handle possible realloc's by refetching the pointer
754 fib_entry = fib_entry_get(fib_entry_index);
755 fib_entry_src_action_activate(fib_entry, source);
757 fib_entry_post_install_actions(fib_entry, source, FIB_ENTRY_FLAG_NONE);
759 FIB_ENTRY_DBG(fib_entry, "create");
761 return (fib_entry_index);
765 fib_entry_create_special (u32 fib_index,
766 const fib_prefix_t *prefix,
768 fib_entry_flag_t flags,
771 fib_node_index_t fib_entry_index;
772 fib_entry_t *fib_entry;
775 * create and initialize the new enty
777 fib_entry = fib_entry_alloc(fib_index, prefix, &fib_entry_index);
780 * create the path-list
782 fib_entry = fib_entry_src_action_add(fib_entry, source, flags, dpo);
783 fib_entry_src_action_activate(fib_entry, source);
785 fib_entry_post_install_actions(fib_entry, source, FIB_ENTRY_FLAG_NONE);
787 FIB_ENTRY_DBG(fib_entry, "create-special");
789 return (fib_entry_index);
793 fib_entry_post_update_actions (fib_entry_t *fib_entry,
795 fib_entry_flag_t old_flags)
798 * backwalk to children to inform then of the change to forwarding.
800 fib_node_back_walk_ctx_t bw_ctx = {
801 .fnbw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE,
804 fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_get_index(fib_entry), &bw_ctx);
807 * then inform any covered prefixes
809 fib_entry_cover_update_notify(fib_entry);
811 fib_entry_post_install_actions(fib_entry, source, old_flags);
815 fib_entry_recalculate_forwarding (fib_node_index_t fib_entry_index)
817 fib_source_t best_source;
818 fib_entry_t *fib_entry;
819 fib_entry_src_t *bsrc;
821 fib_entry = fib_entry_get(fib_entry_index);
823 bsrc = fib_entry_get_best_src_i(fib_entry);
824 best_source = fib_entry_src_get_source(bsrc);
826 fib_entry_src_action_reactivate(fib_entry, best_source);
830 fib_entry_source_change_w_flags (fib_entry_t *fib_entry,
831 fib_source_t old_source,
832 fib_entry_flag_t old_flags,
833 fib_source_t new_source)
835 if (new_source < old_source)
838 * we have a new winning source.
840 fib_entry_src_action_deactivate(fib_entry, old_source);
841 fib_entry_src_action_activate(fib_entry, new_source);
843 else if (new_source > old_source)
846 * the new source loses. Re-activate the winning sources
847 * in case it is an interposer and hence relied on the losing
848 * source's path-list.
850 fib_entry_src_action_reactivate(fib_entry, old_source);
856 * the new source is one this entry already has.
857 * But the path-list was updated, which will contribute new forwarding,
860 fib_entry_src_action_reactivate(fib_entry, new_source);
863 fib_entry_post_update_actions(fib_entry, new_source, old_flags);
867 fib_entry_source_change (fib_entry_t *fib_entry,
868 fib_source_t old_source,
869 fib_source_t new_source)
871 fib_entry_flag_t old_flags;
873 old_flags = fib_entry_get_flags_for_source(
874 fib_entry_get_index(fib_entry), old_source);
876 return (fib_entry_source_change_w_flags(fib_entry, old_source,
877 old_flags, new_source));
881 fib_entry_special_add (fib_node_index_t fib_entry_index,
883 fib_entry_flag_t flags,
886 fib_source_t best_source;
887 fib_entry_t *fib_entry;
889 fib_entry = fib_entry_get(fib_entry_index);
890 best_source = fib_entry_get_best_source(fib_entry_index);
892 fib_entry = fib_entry_src_action_add(fib_entry, source, flags, dpo);
893 fib_entry_source_change(fib_entry, best_source, source);
894 FIB_ENTRY_DBG(fib_entry, "special-add:%U", format_fib_source, source);
898 fib_entry_special_update (fib_node_index_t fib_entry_index,
900 fib_entry_flag_t flags,
903 fib_source_t best_source;
904 fib_entry_t *fib_entry;
906 fib_entry = fib_entry_get(fib_entry_index);
907 best_source = fib_entry_get_best_source(fib_entry_index);
909 fib_entry = fib_entry_src_action_update(fib_entry, source, flags, dpo);
910 fib_entry_source_change(fib_entry, best_source, source);
912 FIB_ENTRY_DBG(fib_entry, "special-updated:%U", format_fib_source, source);
917 fib_entry_path_add (fib_node_index_t fib_entry_index,
919 fib_entry_flag_t flags,
920 const fib_route_path_t *rpaths)
922 fib_source_t best_source;
923 fib_entry_t *fib_entry;
924 fib_entry_src_t *bsrc;
926 fib_entry = fib_entry_get(fib_entry_index);
927 ASSERT(NULL != fib_entry);
929 bsrc = fib_entry_get_best_src_i(fib_entry);
930 best_source = fib_entry_src_get_source(bsrc);
932 fib_entry = fib_entry_src_action_path_add(fib_entry, source, flags, rpaths);
934 fib_entry_source_change(fib_entry, best_source, source);
936 FIB_ENTRY_DBG(fib_entry, "path add:%U", format_fib_source, source);
939 static fib_entry_src_flag_t
940 fib_entry_src_burn_only_inherited (fib_entry_t *fib_entry)
942 fib_entry_src_t *src;
944 int has_only_inherited_sources = 1;
946 FOR_EACH_SRC_ADDED(fib_entry, src, source,
948 if (!(src->fes_flags & FIB_ENTRY_SRC_FLAG_INHERITED))
950 has_only_inherited_sources = 0;
954 if (has_only_inherited_sources)
956 FOR_EACH_SRC_ADDED(fib_entry, src, source,
958 fib_entry_src_action_remove(fib_entry, source);
960 return (FIB_ENTRY_SRC_FLAG_NONE);
964 return (FIB_ENTRY_SRC_FLAG_ADDED);
968 static fib_entry_src_flag_t
969 fib_entry_source_removed (fib_entry_t *fib_entry,
970 fib_entry_flag_t old_flags)
972 const fib_entry_src_t *bsrc;
973 fib_source_t best_source;
976 * if all that is left are inherited sources, then burn them
978 fib_entry_src_burn_only_inherited(fib_entry);
980 bsrc = fib_entry_get_best_src_i(fib_entry);
981 best_source = fib_entry_src_get_source(bsrc);
983 if (FIB_SOURCE_MAX == best_source)
986 * no more sources left. this entry is toast.
988 fib_entry = fib_entry_post_flag_update_actions(fib_entry, old_flags);
989 fib_entry_src_action_uninstall(fib_entry);
991 return (FIB_ENTRY_SRC_FLAG_NONE);
995 fib_entry_src_action_activate(fib_entry, best_source);
998 fib_entry_post_update_actions(fib_entry, best_source, old_flags);
1001 * still have sources
1003 return (FIB_ENTRY_SRC_FLAG_ADDED);
1007 * fib_entry_path_remove
1009 * remove a path from the entry.
1010 * return the fib_entry's index if it is still present, INVALID otherwise.
1012 fib_entry_src_flag_t
1013 fib_entry_path_remove (fib_node_index_t fib_entry_index,
1014 fib_source_t source,
1015 const fib_route_path_t *rpaths)
1017 fib_entry_src_flag_t sflag;
1018 fib_source_t best_source;
1019 fib_entry_flag_t bflags;
1020 fib_entry_t *fib_entry;
1021 fib_entry_src_t *bsrc;
1023 fib_entry = fib_entry_get(fib_entry_index);
1024 ASSERT(NULL != fib_entry);
1026 bsrc = fib_entry_get_best_src_i(fib_entry);
1027 best_source = fib_entry_src_get_source(bsrc);
1028 bflags = fib_entry_src_get_flags(bsrc);
1030 sflag = fib_entry_src_action_path_remove(fib_entry, source, rpaths);
1032 FIB_ENTRY_DBG(fib_entry, "path remove:%U", format_fib_source, source);
1035 * if the path list for the source passed is invalid,
1036 * then we need to create a new one. else we are updating
1039 if (source < best_source)
1042 * Que! removing a path from a source that is better than the
1043 * one this entry is using.
1047 else if (source > best_source )
1050 * the source is not the best. no need to update forwarding
1052 if (FIB_ENTRY_SRC_FLAG_ADDED & sflag)
1055 * the source being removed still has paths
1057 return (FIB_ENTRY_SRC_FLAG_ADDED);
1062 * that was the last path from this source, check if those
1063 * that remain are non-inherited
1065 return (fib_entry_src_burn_only_inherited(fib_entry));
1071 * removing a path from the path-list we were using.
1073 if (!(FIB_ENTRY_SRC_FLAG_ADDED & sflag))
1076 * the last path from the source was removed.
1077 * fallback to lower source
1079 return (fib_entry_source_removed(fib_entry, bflags));
1084 * re-install the new forwarding information
1086 fib_entry_src_action_reactivate(fib_entry, source);
1090 fib_entry_post_update_actions(fib_entry, source, bflags);
1093 * still have sources
1095 return (FIB_ENTRY_SRC_FLAG_ADDED);
1099 * fib_entry_special_remove
1101 * remove a special source from the entry.
1102 * return the fib_entry's index if it is still present, INVALID otherwise.
1104 fib_entry_src_flag_t
1105 fib_entry_special_remove (fib_node_index_t fib_entry_index,
1106 fib_source_t source)
1108 fib_entry_src_flag_t sflag;
1109 fib_source_t best_source;
1110 fib_entry_flag_t bflags;
1111 fib_entry_t *fib_entry;
1112 fib_entry_src_t *bsrc;
1114 fib_entry = fib_entry_get(fib_entry_index);
1115 ASSERT(NULL != fib_entry);
1117 bsrc = fib_entry_get_best_src_i(fib_entry);
1118 best_source = fib_entry_src_get_source(bsrc);
1119 bflags = fib_entry_src_get_flags(bsrc);
1121 FIB_ENTRY_DBG(fib_entry, "special remove:%U", format_fib_source, source);
1123 sflag = fib_entry_src_action_remove_or_update_inherit(fib_entry, source);
1126 * if the path list for the source passed is invalid,
1127 * then we need to create a new one. else we are updating
1130 if (source < best_source )
1133 * Que! removing a path from a source that is better than the
1134 * one this entry is using. This can only mean it is a source
1135 * this prefix does not have.
1137 return (FIB_ENTRY_SRC_FLAG_ADDED);
1139 else if (source > best_source ) {
1141 * the source is not the best. no need to update forwarding
1143 if (FIB_ENTRY_SRC_FLAG_ADDED & sflag)
1146 * the source being removed still has paths
1148 return (FIB_ENTRY_SRC_FLAG_ADDED);
1153 * that was the last path from this source, check if those
1154 * that remain are non-inherited
1156 if (FIB_ENTRY_SRC_FLAG_NONE == fib_entry_src_burn_only_inherited(fib_entry))
1159 * no more sources left. this entry is toast.
1161 fib_entry = fib_entry_post_flag_update_actions(fib_entry, bflags);
1162 fib_entry_src_action_uninstall(fib_entry);
1163 return (FIB_ENTRY_SRC_FLAG_NONE);
1167 * reactivate the best source so the interposer gets restacked
1169 fib_entry_src_action_reactivate(fib_entry, best_source);
1171 return (FIB_ENTRY_SRC_FLAG_ADDED);
1176 if (!(FIB_ENTRY_SRC_FLAG_ADDED & sflag))
1179 * the source was removed. use the next best.
1181 return (fib_entry_source_removed(fib_entry, bflags));
1186 * re-install the new forwarding information
1188 fib_entry_src_action_reactivate(fib_entry, source);
1192 fib_entry_post_update_actions(fib_entry, source, bflags);
1195 * still have sources
1197 return (FIB_ENTRY_SRC_FLAG_ADDED);
1203 * If the source on the cover is inheriting then push this source
1204 * down to the covered.
1207 fib_entry_inherit (fib_node_index_t cover,
1208 fib_node_index_t covered)
1210 fib_entry_src_inherit(fib_entry_get(cover),
1211 fib_entry_get(covered));
1217 * The source is withdrawing all the paths it provided
1219 fib_entry_src_flag_t
1220 fib_entry_delete (fib_node_index_t fib_entry_index,
1221 fib_source_t source)
1223 return (fib_entry_special_remove(fib_entry_index, source));
1229 * The source has provided a new set of paths that will replace the old.
1232 fib_entry_update (fib_node_index_t fib_entry_index,
1233 fib_source_t source,
1234 fib_entry_flag_t flags,
1235 const fib_route_path_t *paths)
1237 fib_source_t best_source;
1238 fib_entry_flag_t bflags;
1239 fib_entry_t *fib_entry;
1240 fib_entry_src_t *bsrc;
1242 fib_entry = fib_entry_get(fib_entry_index);
1243 ASSERT(NULL != fib_entry);
1245 bsrc = fib_entry_get_best_src_i(fib_entry);
1246 best_source = fib_entry_src_get_source(bsrc);
1247 bflags = fib_entry_get_flags_i(fib_entry);
1249 fib_entry = fib_entry_src_action_path_swap(fib_entry,
1254 fib_entry_source_change_w_flags(fib_entry, best_source, bflags, source);
1255 FIB_ENTRY_DBG(fib_entry, "update");
1260 * fib_entry_cover_changed
1262 * this entry is tracking its cover and that cover has changed.
1265 fib_entry_cover_changed (fib_node_index_t fib_entry_index)
1267 fib_entry_src_cover_res_t res = {
1269 .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
1271 CLIB_UNUSED(fib_source_t source);
1272 fib_source_t best_source;
1273 fib_entry_flag_t bflags;
1274 fib_entry_t *fib_entry;
1275 fib_entry_src_t *esrc;
1278 bflags = FIB_ENTRY_FLAG_NONE;
1279 best_source = FIB_SOURCE_FIRST;
1280 fib_entry = fib_entry_get(fib_entry_index);
1282 fib_attached_export_cover_change(fib_entry);
1285 * propagate the notification to each of the added sources
1288 FOR_EACH_SRC_ADDED(fib_entry, esrc, source,
1293 * only the best source gets to set the back walk flags
1295 res = fib_entry_src_action_cover_change(fib_entry, esrc);
1296 bflags = fib_entry_src_get_flags(esrc);
1297 best_source = fib_entry_src_get_source(esrc);
1301 fib_entry_src_action_cover_change(fib_entry, esrc);
1308 fib_entry_src_action_reactivate(fib_entry,
1309 fib_entry_src_get_source(
1310 fib_entry_get_best_src_i(fib_entry)));
1311 fib_entry_post_install_actions(fib_entry, best_source, bflags);
1315 fib_entry_src_action_uninstall(fib_entry);
1318 if (FIB_NODE_BW_REASON_FLAG_NONE != res.bw_reason)
1321 * time for walkies fido.
1323 fib_node_back_walk_ctx_t bw_ctx = {
1324 .fnbw_reason = res.bw_reason,
1327 fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_index, &bw_ctx);
1329 FIB_ENTRY_DBG(fib_entry, "cover-changed");
1333 * fib_entry_cover_updated
1335 * this entry is tracking its cover and that cover has been updated
1336 * (i.e. its forwarding information has changed).
1339 fib_entry_cover_updated (fib_node_index_t fib_entry_index)
1341 fib_entry_src_cover_res_t res = {
1343 .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
1345 CLIB_UNUSED(fib_source_t source);
1346 fib_source_t best_source;
1347 fib_entry_flag_t bflags;
1348 fib_entry_t *fib_entry;
1349 fib_entry_src_t *esrc;
1352 bflags = FIB_ENTRY_FLAG_NONE;
1353 best_source = FIB_SOURCE_FIRST;
1354 fib_entry = fib_entry_get(fib_entry_index);
1356 fib_attached_export_cover_update(fib_entry);
1359 * propagate the notification to each of the added sources
1362 FOR_EACH_SRC_ADDED(fib_entry, esrc, source,
1367 * only the best source gets to set the back walk flags
1369 res = fib_entry_src_action_cover_update(fib_entry, esrc);
1370 bflags = fib_entry_src_get_flags(esrc);
1371 best_source = fib_entry_src_get_source(esrc);
1375 fib_entry_src_action_cover_update(fib_entry, esrc);
1382 fib_entry_src_action_reactivate(fib_entry,
1383 fib_entry_src_get_source(
1384 fib_entry_get_best_src_i(fib_entry)));
1385 fib_entry_post_install_actions(fib_entry, best_source, bflags);
1389 fib_entry_src_action_uninstall(fib_entry);
1392 if (FIB_NODE_BW_REASON_FLAG_NONE != res.bw_reason)
1395 * time for walkies fido.
1397 fib_node_back_walk_ctx_t bw_ctx = {
1398 .fnbw_reason = res.bw_reason,
1401 fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_index, &bw_ctx);
1403 FIB_ENTRY_DBG(fib_entry, "cover-updated");
1407 fib_entry_recursive_loop_detect (fib_node_index_t entry_index,
1408 fib_node_index_t **entry_indicies)
1410 fib_entry_t *fib_entry;
1411 int was_looped, is_looped;
1413 fib_entry = fib_entry_get(entry_index);
1415 if (FIB_NODE_INDEX_INVALID != fib_entry->fe_parent)
1417 fib_node_index_t *entries = *entry_indicies;
1419 vec_add1(entries, entry_index);
1420 was_looped = fib_path_list_is_looped(fib_entry->fe_parent);
1421 is_looped = fib_path_list_recursive_loop_detect(fib_entry->fe_parent,
1424 *entry_indicies = entries;
1426 if (!!was_looped != !!is_looped)
1429 * re-evaluate all the entry's forwarding
1430 * NOTE: this is an inplace modify
1432 fib_entry_delegate_type_t fdt;
1433 fib_entry_delegate_t *fed;
1435 FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
1437 fib_entry_src_mk_lb(fib_entry,
1438 fib_entry_get_best_src_i(fib_entry),
1439 fib_entry_delegate_type_to_chain_type(fdt),
1447 * the entry is currently not linked to a path-list. this happens
1448 * when it is this entry that is re-linking path-lists and has thus
1458 fib_entry_get_resolving_interface (fib_node_index_t entry_index)
1460 fib_entry_t *fib_entry;
1462 fib_entry = fib_entry_get(entry_index);
1464 return (fib_path_list_get_resolving_interface(fib_entry->fe_parent));
1468 fib_entry_get_best_source (fib_node_index_t entry_index)
1470 fib_entry_t *fib_entry;
1471 fib_entry_src_t *bsrc;
1473 fib_entry = fib_entry_get(entry_index);
1475 bsrc = fib_entry_get_best_src_i(fib_entry);
1476 return (fib_entry_src_get_source(bsrc));
1480 * Return !0 is the entry represents a host prefix
1483 fib_entry_is_host (fib_node_index_t fib_entry_index)
1485 return (fib_prefix_is_host(fib_entry_get_prefix(fib_entry_index)));
1489 * Return !0 is the entry is resolved, i.e. will return a valid forwarding
1493 fib_entry_is_resolved (fib_node_index_t fib_entry_index)
1495 fib_entry_delegate_t *fed;
1496 fib_entry_t *fib_entry;
1498 fib_entry = fib_entry_get(fib_entry_index);
1500 fed = fib_entry_delegate_find(fib_entry, FIB_ENTRY_DELEGATE_BFD);
1505 * no BFD tracking - consider it resolved.
1512 * defer to the state of the BFD tracking
1514 return (FIB_BFD_STATE_UP == fed->fd_bfd_state);
1519 fib_entry_set_flow_hash_config (fib_node_index_t fib_entry_index,
1520 flow_hash_config_t hash_config)
1522 fib_entry_t *fib_entry;
1524 fib_entry = fib_entry_get(fib_entry_index);
1527 * pass the hash-config on to the load-balance object where it is cached.
1528 * we can ignore LBs in the delegate chains, since they will not be of the
1529 * correct protocol type (i.e. they are not IP)
1530 * There's no way, nor need, to change the hash config for MPLS.
1532 if (dpo_id_is_valid(&fib_entry->fe_lb))
1536 ASSERT(DPO_LOAD_BALANCE == fib_entry->fe_lb.dpoi_type);
1538 lb = load_balance_get(fib_entry->fe_lb.dpoi_index);
1541 * atomic update for packets in flight
1543 lb->lb_hash_config = hash_config;
1548 fib_entry_get_stats_index (fib_node_index_t fib_entry_index)
1550 fib_entry_t *fib_entry;
1552 fib_entry = fib_entry_get(fib_entry_index);
1554 return (fib_entry->fe_lb.dpoi_index);
1558 fib_ip4_address_compare (const ip4_address_t * a1,
1559 const ip4_address_t * a2)
1562 * IP addresses are unsigned ints. the return value here needs to be signed
1563 * a simple subtraction won't cut it.
1564 * If the addresses are the same, the sort order is undefined, so phoey.
1566 return ((clib_net_to_host_u32(a1->data_u32) >
1567 clib_net_to_host_u32(a2->data_u32) ) ?
1572 fib_ip6_address_compare (const ip6_address_t * a1,
1573 const ip6_address_t * a2)
1576 for (i = 0; i < ARRAY_LEN (a1->as_u16); i++)
1578 int cmp = (clib_net_to_host_u16 (a1->as_u16[i]) -
1579 clib_net_to_host_u16 (a2->as_u16[i]));
1587 fib_entry_cmp (fib_node_index_t fib_entry_index1,
1588 fib_node_index_t fib_entry_index2)
1590 fib_entry_t *fib_entry1, *fib_entry2;
1593 fib_entry1 = fib_entry_get(fib_entry_index1);
1594 fib_entry2 = fib_entry_get(fib_entry_index2);
1596 switch (fib_entry1->fe_prefix.fp_proto)
1598 case FIB_PROTOCOL_IP4:
1599 cmp = fib_ip4_address_compare(&fib_entry1->fe_prefix.fp_addr.ip4,
1600 &fib_entry2->fe_prefix.fp_addr.ip4);
1602 case FIB_PROTOCOL_IP6:
1603 cmp = fib_ip6_address_compare(&fib_entry1->fe_prefix.fp_addr.ip6,
1604 &fib_entry2->fe_prefix.fp_addr.ip6);
1606 case FIB_PROTOCOL_MPLS:
1607 cmp = (fib_entry1->fe_prefix.fp_label - fib_entry2->fe_prefix.fp_label);
1611 cmp = (fib_entry1->fe_prefix.fp_eos - fib_entry2->fe_prefix.fp_eos);
1617 cmp = (fib_entry1->fe_prefix.fp_len - fib_entry2->fe_prefix.fp_len);
1623 fib_entry_cmp_for_sort (void *i1, void *i2)
1625 fib_node_index_t *fib_entry_index1 = i1, *fib_entry_index2 = i2;
1627 return (fib_entry_cmp(*fib_entry_index1,
1628 *fib_entry_index2));
1632 fib_entry_lock (fib_node_index_t fib_entry_index)
1634 fib_entry_t *fib_entry;
1636 fib_entry = fib_entry_get(fib_entry_index);
1638 fib_node_lock(&fib_entry->fe_node);
1642 fib_entry_unlock (fib_node_index_t fib_entry_index)
1644 fib_entry_t *fib_entry;
1646 fib_entry = fib_entry_get(fib_entry_index);
1648 fib_node_unlock(&fib_entry->fe_node);
1652 fib_entry_module_init (void)
1654 fib_node_register_type(FIB_NODE_TYPE_ENTRY, &fib_entry_vft);
1655 fib_entry_logger = vlib_log_register_class("fib", "entry");
1657 fib_entry_track_module_init();
1661 fib_entry_encode (fib_node_index_t fib_entry_index)
1663 fib_path_ext_list_t *ext_list;
1664 fib_path_encode_ctx_t ctx = {
1667 fib_entry_t *fib_entry;
1668 fib_entry_src_t *bsrc;
1671 fib_entry = fib_entry_get(fib_entry_index);
1672 bsrc = fib_entry_get_best_src_i(fib_entry);
1676 ext_list = &bsrc->fes_path_exts;
1679 if (FIB_NODE_INDEX_INVALID != fib_entry->fe_parent)
1681 fib_path_list_walk_w_ext(fib_entry->fe_parent,
1687 return (ctx.rpaths);
1690 const fib_prefix_t *
1691 fib_entry_get_prefix (fib_node_index_t fib_entry_index)
1693 fib_entry_t *fib_entry;
1695 fib_entry = fib_entry_get(fib_entry_index);
1697 return (&fib_entry->fe_prefix);
1701 fib_entry_get_fib_index (fib_node_index_t fib_entry_index)
1703 fib_entry_t *fib_entry;
1705 fib_entry = fib_entry_get(fib_entry_index);
1707 return (fib_entry->fe_fib_index);
1711 fib_entry_pool_size (void)
1713 return (pool_elts(fib_entry_pool));
1716 static clib_error_t *
1717 show_fib_entry_command (vlib_main_t * vm,
1718 unformat_input_t * input,
1719 vlib_cli_command_t * cmd)
1721 fib_node_index_t fei;
1723 if (unformat (input, "%d", &fei))
1726 * show one in detail
1728 if (!pool_is_free_index(fib_entry_pool, fei))
1730 vlib_cli_output (vm, "%d@%U",
1732 format_fib_entry, fei,
1733 FIB_ENTRY_FORMAT_DETAIL2);
1737 vlib_cli_output (vm, "entry %d invalid", fei);
1745 vlib_cli_output (vm, "FIB Entries:");
1746 pool_foreach_index(fei, fib_entry_pool,
1748 vlib_cli_output (vm, "%d@%U",
1750 format_fib_entry, fei,
1751 FIB_ENTRY_FORMAT_BRIEF);
1758 VLIB_CLI_COMMAND (show_fib_entry, static) = {
1759 .path = "show fib entry",
1760 .function = show_fib_entry_command,
1761 .short_help = "show fib entry",