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 #ifndef __FIB_ENTRY_H__
17 #define __FIB_ENTRY_H__
19 #include <vnet/fib/fib_node.h>
20 #include <vnet/adj/adj.h>
21 #include <vnet/ip/ip.h>
22 #include <vnet/dpo/dpo.h>
25 * The different sources that can create a route.
26 * The sources are defined here the thier relative priority order.
27 * The lower the value the higher the priority
29 typedef enum fib_source_t_ {
31 * Marker. Add new values after this one.
35 * Special sources. These are for entries that are added to all
36 * FIBs by default, and should never be over-ridden (hence they
37 * are the highest priority)
39 FIB_SOURCE_SPECIAL = FIB_SOURCE_FIRST,
41 * Classify. A route that links directly to a classify adj
45 * A route the is being 'proxied' on behalf of another device
49 * Route added as a result of interface configuration.
50 * this will also come from the API/CLI, but the distinction is
51 * that is from confiiguration on an interface, not a 'ip route' command
59 * A high priority source a plugin can use
63 * From the BIER subsystem
71 * From the control plane API
79 * A low (below routing) priority source a plugin can use
81 FIB_SOURCE_PLUGIN_LOW,
97 FIB_SOURCE_IP6_ND_PROXY,
99 * IPv6 ND (seen in the link-local tables)
104 * routes created as a result of ARP/ND entries. This is lower priority
105 * then the API/CLI. This is on purpose. trust me.
109 * MPLS label. The prefix has been assigned a local label. This source
110 * never provides forwarding information, instead it acts as a place-holder
111 * so the association of label to prefix can be maintained
115 * Attached Export source.
116 * routes created as a result of attahced export. routes thus sourced
117 * will be present in the export tables
121 * Recursive resolution source.
122 * Used to install an entry that is the resolution traget of another.
126 * uRPF bypass/exemption.
127 * Used to install an entry that is exempt from the loose uRPF check
129 FIB_SOURCE_URPF_EXEMPT,
131 * The default route source.
132 * The default route is always added to the FIB table (like the
133 * special sources) but we need to be able to over-ride it with
134 * 'ip route' sources when provided
136 FIB_SOURCE_DEFAULT_ROUTE,
138 * The interpose source.
139 * This is not a real source, so don't use it to source a prefix.
140 * It exists here to provide a value against which to register to the
141 * VFT for providing the interpose actions to a real source.
143 FIB_SOURCE_INTERPOSE,
145 * Marker. add new entries before this one.
147 FIB_SOURCE_LAST = FIB_SOURCE_INTERPOSE,
148 } __attribute__ ((packed)) fib_source_t;
150 STATIC_ASSERT (sizeof(fib_source_t) == 1,
151 "FIB too many sources");
154 * The maximum number of sources
156 #define FIB_SOURCE_MAX (FIB_SOURCE_LAST+1)
158 #define FIB_SOURCES { \
159 [FIB_SOURCE_SPECIAL] = "special", \
160 [FIB_SOURCE_INTERFACE] = "interface", \
161 [FIB_SOURCE_PROXY] = "proxy", \
162 [FIB_SOURCE_BIER] = "BIER", \
163 [FIB_SOURCE_6RD] = "6RD", \
164 [FIB_SOURCE_API] = "API", \
165 [FIB_SOURCE_CLI] = "CLI", \
166 [FIB_SOURCE_ADJ] = "adjacency", \
167 [FIB_SOURCE_MAP] = "MAP", \
168 [FIB_SOURCE_SR] = "SR", \
169 [FIB_SOURCE_LISP] = "LISP", \
170 [FIB_SOURCE_CLASSIFY] = "classify", \
171 [FIB_SOURCE_DHCP] = "DHCP", \
172 [FIB_SOURCE_IP6_ND_PROXY] = "IPv6-proxy-nd", \
173 [FIB_SOURCE_IP6_ND] = "IPv6-nd", \
174 [FIB_SOURCE_RR] = "recursive-resolution", \
175 [FIB_SOURCE_AE] = "attached_export", \
176 [FIB_SOURCE_MPLS] = "mpls", \
177 [FIB_SOURCE_URPF_EXEMPT] = "urpf-exempt", \
178 [FIB_SOURCE_DEFAULT_ROUTE] = "default-route", \
179 [FIB_SOURCE_PLUGIN_HI] = "plugin-hi", \
180 [FIB_SOURCE_PLUGIN_LOW] = "plugin-low", \
181 [FIB_SOURCE_INTERPOSE] = "interpose", \
184 #define FOR_EACH_FIB_SOURCE(_item) \
185 for (_item = FIB_SOURCE_FIRST; _item < FIB_SOURCE_MAX; _item++)
188 * The different sources that can create a route.
189 * The sources are defined here the thier relative priority order.
190 * The lower the value the higher the priority
192 typedef enum fib_entry_attribute_t_ {
194 * Marker. Add new values after this one.
196 FIB_ENTRY_ATTRIBUTE_FIRST,
198 * Connected. The prefix is configured on an interface.
200 FIB_ENTRY_ATTRIBUTE_CONNECTED = FIB_ENTRY_ATTRIBUTE_FIRST,
202 * Attached. The prefix is attached to an interface.
204 FIB_ENTRY_ATTRIBUTE_ATTACHED,
206 * The route is an explicit drop.
208 FIB_ENTRY_ATTRIBUTE_DROP,
210 * The route is exclusive. The client creating the route is
211 * providing an exclusive adjacency.
213 FIB_ENTRY_ATTRIBUTE_EXCLUSIVE,
215 * The route is attached cross tables and thus imports covered
216 * prefixes from the other table.
218 FIB_ENTRY_ATTRIBUTE_IMPORT,
220 * The prefix/address is local to this device
222 FIB_ENTRY_ATTRIBUTE_LOCAL,
224 * The prefix/address is a multicast prefix.
225 * this aplies only to MPLS. IP multicast is handled by mfib
227 FIB_ENTRY_ATTRIBUTE_MULTICAST,
229 * The prefix/address exempted from loose uRPF check
230 * To be used with caution
232 FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT,
234 * The prefix/address exempted from attached export
236 FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT,
238 * This FIB entry imposes its source information on all prefixes
241 FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT,
243 * The interpose attribute.
244 * place the forwarding provided by the source infront of the forwarding
245 * provided by the best source, or failing that, by the cover.
247 FIB_ENTRY_ATTRIBUTE_INTERPOSE,
249 * Marker. add new entries before this one.
251 FIB_ENTRY_ATTRIBUTE_LAST = FIB_ENTRY_ATTRIBUTE_INTERPOSE,
252 } fib_entry_attribute_t;
254 #define FIB_ENTRY_ATTRIBUTES { \
255 [FIB_ENTRY_ATTRIBUTE_CONNECTED] = "connected", \
256 [FIB_ENTRY_ATTRIBUTE_ATTACHED] = "attached", \
257 [FIB_ENTRY_ATTRIBUTE_IMPORT] = "import", \
258 [FIB_ENTRY_ATTRIBUTE_DROP] = "drop", \
259 [FIB_ENTRY_ATTRIBUTE_EXCLUSIVE] = "exclusive", \
260 [FIB_ENTRY_ATTRIBUTE_LOCAL] = "local", \
261 [FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT] = "uRPF-exempt", \
262 [FIB_ENTRY_ATTRIBUTE_MULTICAST] = "multicast", \
263 [FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT] = "no-attached-export", \
264 [FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT] = "covered-inherit", \
265 [FIB_ENTRY_ATTRIBUTE_INTERPOSE] = "interpose", \
268 #define FOR_EACH_FIB_ATTRIBUTE(_item) \
269 for (_item = FIB_ENTRY_ATTRIBUTE_FIRST; \
270 _item <= FIB_ENTRY_ATTRIBUTE_LAST; \
273 typedef enum fib_entry_flag_t_ {
274 FIB_ENTRY_FLAG_NONE = 0,
275 FIB_ENTRY_FLAG_CONNECTED = (1 << FIB_ENTRY_ATTRIBUTE_CONNECTED),
276 FIB_ENTRY_FLAG_ATTACHED = (1 << FIB_ENTRY_ATTRIBUTE_ATTACHED),
277 FIB_ENTRY_FLAG_DROP = (1 << FIB_ENTRY_ATTRIBUTE_DROP),
278 FIB_ENTRY_FLAG_EXCLUSIVE = (1 << FIB_ENTRY_ATTRIBUTE_EXCLUSIVE),
279 FIB_ENTRY_FLAG_LOCAL = (1 << FIB_ENTRY_ATTRIBUTE_LOCAL),
280 FIB_ENTRY_FLAG_IMPORT = (1 << FIB_ENTRY_ATTRIBUTE_IMPORT),
281 FIB_ENTRY_FLAG_NO_ATTACHED_EXPORT = (1 << FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT),
282 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT = (1 << FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT),
283 FIB_ENTRY_FLAG_MULTICAST = (1 << FIB_ENTRY_ATTRIBUTE_MULTICAST),
284 FIB_ENTRY_FLAG_COVERED_INHERIT = (1 << FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT),
285 FIB_ENTRY_FLAG_INTERPOSE = (1 << FIB_ENTRY_ATTRIBUTE_INTERPOSE),
286 } __attribute__((packed)) fib_entry_flag_t;
288 extern u8 * format_fib_entry_flags(u8 *s, va_list *args);
291 * Flags for the source data
293 typedef enum fib_entry_src_attribute_t_ {
295 * Marker. Add new values after this one.
297 FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
299 * the source has been added to the entry
301 FIB_ENTRY_SRC_ATTRIBUTE_ADDED = FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
303 * the source is contributing forwarding
305 FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING,
307 * the source is active/best
309 FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE,
311 * the source is inherited from its cover
313 FIB_ENTRY_SRC_ATTRIBUTE_INHERITED,
315 * Marker. add new entries before this one.
317 FIB_ENTRY_SRC_ATTRIBUTE_LAST = FIB_ENTRY_SRC_ATTRIBUTE_INHERITED,
318 } fib_entry_src_attribute_t;
321 #define FIB_ENTRY_SRC_ATTRIBUTES { \
322 [FIB_ENTRY_SRC_ATTRIBUTE_ADDED] = "added", \
323 [FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING] = "contributing", \
324 [FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE] = "active", \
325 [FIB_ENTRY_SRC_ATTRIBUTE_INHERITED] = "inherited", \
328 #define FOR_EACH_FIB_SRC_ATTRIBUTE(_item) \
329 for (_item = FIB_ENTRY_SRC_ATTRIBUTE_FIRST; \
330 _item <= FIB_ENTRY_SRC_ATTRIBUTE_LAST; \
333 typedef enum fib_entry_src_flag_t_ {
334 FIB_ENTRY_SRC_FLAG_NONE = 0,
335 FIB_ENTRY_SRC_FLAG_ADDED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ADDED),
336 FIB_ENTRY_SRC_FLAG_CONTRIBUTING = (1 << FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING),
337 FIB_ENTRY_SRC_FLAG_ACTIVE = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE),
338 FIB_ENTRY_SRC_FLAG_INHERITED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_INHERITED),
339 } __attribute__ ((packed)) fib_entry_src_flag_t;
341 extern u8 * format_fib_entry_src_flags(u8 *s, va_list *args);
344 * Keep the size of the flags field to 2 bytes, so it
345 * can be placed next to the 2 bytes reference count
347 STATIC_ASSERT (sizeof(fib_entry_src_flag_t) <= 2,
348 "FIB entry flags field size too big");
351 * Information related to the source of a FIB entry
353 typedef struct fib_entry_src_t_ {
355 * A vector of path extensions
357 fib_path_ext_list_t fes_path_exts;
360 * The path-list created by the source
362 fib_node_index_t fes_pl;
365 * Flags the source contributes to the entry
367 fib_entry_flag_t fes_entry_flags;
370 * Which source this info block is for
372 fib_source_t fes_src;
375 * Flags on the source
377 fib_entry_src_flag_t fes_flags;
380 * 1 bytes ref count. This is not the number of users of the Entry
381 * (which is itself not large, due to path-list sharing), but the number
382 * of times a given source has been added. Which is even fewer
387 * Source specific info
392 * the index of the FIB entry that is the covering entry
394 fib_node_index_t fesr_cover;
396 * This source's index in the cover's list
402 * the index of the FIB entry that is the covering entry
404 fib_node_index_t fesi_cover;
406 * This source's index in the cover's list
410 * DPO type to interpose. The dpo type needs to have registered
411 * it's 'contribute interpose' callback function.
417 * the index of the FIB entry that is the covering entry
419 fib_node_index_t fesa_cover;
421 * This source's index in the cover's list
427 * the index of the FIB entry that is the covering entry
429 fib_node_index_t fesi_cover;
431 * This source's index in the cover's list
437 * This MPLS local label associated with the prefix.
439 mpls_label_t fesm_label;
442 * the indicies of the LFIB entries created
444 fib_node_index_t fesm_lfes[2];
448 * The source FIB index.
450 fib_node_index_t fesl_fib_index;
456 * An entry in a FIB table.
458 * This entry represents a route added to the FIB that is stored
459 * in one of the FIB tables.
461 typedef struct fib_entry_t_ {
463 * Base class. The entry's node representation in the graph.
467 * The prefix of the route. this is const just to be sure.
468 * It is the entry's key/identity and so should never change.
470 const fib_prefix_t fe_prefix;
472 * The index of the FIB table this entry is in
476 * The load-balance used for forwarding.
478 * We don't share the EOS and non-EOS even in case when they could be
480 * - complexity & reliability v. memory
481 * determining the conditions where sharing is possible is non-trivial.
482 * - separate LBs means we can get the EOS bit right in the MPLS label DPO
483 * and so save a few clock cycles in the DP imposition node since we can
484 * paint the header straight on without the need to check the packet
485 * type to derive the EOS bit value.
489 * Vector of source infos.
490 * Most entries will only have 1 source. So we optimise for memory usage,
491 * which is preferable since we have many entries.
493 fib_entry_src_t *fe_srcs;
495 * the path-list for which this entry is a child. This is also the path-list
496 * that is contributing forwarding for this entry.
498 fib_node_index_t fe_parent;
500 * index of this entry in the parent's child list.
501 * This is set when this entry is added as a child, but can also
502 * be changed by the parent as it manages its list.
507 * A vector of delegate indices.
509 index_t *fe_delegates;
512 #define FOR_EACH_FIB_ENTRY_FLAG(_item) \
513 for (_item = FIB_ENTRY_FLAG_FIRST; _item < FIB_ENTRY_FLAG_MAX; _item++)
515 #define FIB_ENTRY_FORMAT_BRIEF (0x0)
516 #define FIB_ENTRY_FORMAT_DETAIL (0x1)
517 #define FIB_ENTRY_FORMAT_DETAIL2 (0x2)
519 extern u8 *format_fib_entry (u8 * s, va_list * args);
520 extern u8 *format_fib_source (u8 * s, va_list * args);
522 extern fib_node_index_t fib_entry_create_special(u32 fib_index,
523 const fib_prefix_t *prefix,
525 fib_entry_flag_t flags,
526 const dpo_id_t *dpo);
528 extern fib_node_index_t fib_entry_create (u32 fib_index,
529 const fib_prefix_t *prefix,
531 fib_entry_flag_t flags,
532 const fib_route_path_t *paths);
533 extern void fib_entry_update (fib_node_index_t fib_entry_index,
535 fib_entry_flag_t flags,
536 const fib_route_path_t *paths);
538 extern void fib_entry_path_add(fib_node_index_t fib_entry_index,
540 fib_entry_flag_t flags,
541 const fib_route_path_t *rpaths);
542 extern void fib_entry_special_add(fib_node_index_t fib_entry_index,
544 fib_entry_flag_t flags,
545 const dpo_id_t *dpo);
546 extern void fib_entry_special_update(fib_node_index_t fib_entry_index,
548 fib_entry_flag_t flags,
549 const dpo_id_t *dpo);
550 extern fib_entry_src_flag_t fib_entry_special_remove(fib_node_index_t fib_entry_index,
551 fib_source_t source);
553 extern fib_entry_src_flag_t fib_entry_path_remove(fib_node_index_t fib_entry_index,
555 const fib_route_path_t *rpaths);
557 extern void fib_entry_inherit(fib_node_index_t cover,
558 fib_node_index_t covered);
560 extern fib_entry_src_flag_t fib_entry_delete(fib_node_index_t fib_entry_index,
561 fib_source_t source);
563 extern void fib_entry_recalculate_forwarding(
564 fib_node_index_t fib_entry_index);
565 extern void fib_entry_contribute_urpf(fib_node_index_t path_index,
567 extern void fib_entry_contribute_forwarding(
568 fib_node_index_t fib_entry_index,
569 fib_forward_chain_type_t type,
571 extern const dpo_id_t * fib_entry_contribute_ip_forwarding(
572 fib_node_index_t fib_entry_index);
573 extern adj_index_t fib_entry_get_adj_for_source(
574 fib_node_index_t fib_entry_index,
575 fib_source_t source);
576 extern const int fib_entry_get_dpo_for_source (
577 fib_node_index_t fib_entry_index,
581 extern adj_index_t fib_entry_get_adj(fib_node_index_t fib_entry_index);
583 extern int fib_entry_cmp_for_sort(void *i1, void *i2);
585 extern void fib_entry_cover_changed(fib_node_index_t fib_entry);
586 extern void fib_entry_cover_updated(fib_node_index_t fib_entry);
587 extern int fib_entry_recursive_loop_detect(fib_node_index_t entry_index,
588 fib_node_index_t **entry_indicies);
590 extern void fib_entry_lock(fib_node_index_t fib_entry_index);
591 extern void fib_entry_unlock(fib_node_index_t fib_entry_index);
593 extern u32 fib_entry_child_add(fib_node_index_t fib_entry_index,
594 fib_node_type_t type,
595 fib_node_index_t child_index);
596 extern void fib_entry_child_remove(fib_node_index_t fib_entry_index,
598 extern u32 fib_entry_get_resolving_interface(fib_node_index_t fib_entry_index);
599 extern u32 fib_entry_get_resolving_interface_for_source(
600 fib_node_index_t fib_entry_index,
601 fib_source_t source);
603 extern fib_route_path_t* fib_entry_encode(fib_node_index_t fib_entry_index);
604 extern const fib_prefix_t* fib_entry_get_prefix(fib_node_index_t fib_entry_index);
605 extern u32 fib_entry_get_fib_index(fib_node_index_t fib_entry_index);
606 extern void fib_entry_set_source_data(fib_node_index_t fib_entry_index,
609 extern const void* fib_entry_get_source_data(fib_node_index_t fib_entry_index,
610 fib_source_t source);
612 extern fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index);
613 extern fib_entry_flag_t fib_entry_get_flags_for_source(
614 fib_node_index_t fib_entry_index,
615 fib_source_t source);
616 extern fib_source_t fib_entry_get_best_source(fib_node_index_t fib_entry_index);
617 extern int fib_entry_is_sourced(fib_node_index_t fib_entry_index,
618 fib_source_t source);
620 extern fib_node_index_t fib_entry_get_path_list(fib_node_index_t fib_entry_index);
621 extern int fib_entry_is_resolved(fib_node_index_t fib_entry_index);
622 extern int fib_entry_is_host(fib_node_index_t fib_entry_index);
623 extern void fib_entry_set_flow_hash_config(fib_node_index_t fib_entry_index,
624 flow_hash_config_t hash_config);
626 extern void fib_entry_module_init(void);
628 extern u32 fib_entry_get_stats_index(fib_node_index_t fib_entry_index);
631 * unsafe... beware the raw pointer.
633 extern fib_node_index_t fib_entry_get_index(const fib_entry_t * fib_entry);
634 extern fib_entry_t * fib_entry_get(fib_node_index_t fib_entry_index);
637 * for testing purposes.
639 extern u32 fib_entry_pool_size(void);