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/fib/fib_entry_delegate.h>
21 #include <vnet/adj/adj.h>
22 #include <vnet/ip/ip.h>
23 #include <vnet/dpo/dpo.h>
26 * The different sources that can create a route.
27 * The sources are defined here the thier relative priority order.
28 * The lower the value the higher the priority
30 typedef enum fib_source_t_ {
32 * Marker. Add new values after this one.
36 * Special sources. These are for entries that are added to all
37 * FIBs by default, and should never be over-ridden (hence they
38 * are the highest priority)
40 FIB_SOURCE_SPECIAL = FIB_SOURCE_FIRST,
42 * Classify. A route that links directly to a classify adj
46 * A route the is being 'proxied' on behalf of another device
50 * Route added as a result of interface configuration.
51 * this will also come from the API/CLI, but the distinction is
52 * that is from confiiguration on an interface, not a 'ip route' command
60 * A high priority source a plugin can use
64 * From the BIER subsystem
68 * From the control plane API
90 FIB_SOURCE_IP6_ND_PROXY,
92 * IPv6 ND (seen in the link-local tables)
97 * routes created as a result of ARP/ND entries. This is lower priority
98 * then the API/CLI. This is on purpose. trust me.
102 * MPLS label. The prefix has been assigned a local label. This source
103 * never provides forwarding information, instead it acts as a place-holder
104 * so the association of label to prefix can be maintained
108 * Attached Export source.
109 * routes created as a result of attahced export. routes thus sourced
110 * will be present in the export tables
114 * Recursive resolution source.
115 * Used to install an entry that is the resolution traget of another.
119 * uRPF bypass/exemption.
120 * Used to install an entry that is exempt from the loose uRPF check
122 FIB_SOURCE_URPF_EXEMPT,
124 * The default route source.
125 * The default route is always added to the FIB table (like the
126 * special sources) but we need to be able to over-ride it with
127 * 'ip route' sources when provided
129 FIB_SOURCE_DEFAULT_ROUTE,
131 * The interpose source.
132 * This is not a real source, so don't use it to source a prefix.
133 * It exists here to provide a value against which to register to the
134 * VFT for providing the interpose actions to a real source.
136 FIB_SOURCE_INTERPOSE,
138 * Marker. add new entries before this one.
140 FIB_SOURCE_LAST = FIB_SOURCE_INTERPOSE,
141 } __attribute__ ((packed)) fib_source_t;
143 STATIC_ASSERT (sizeof(fib_source_t) == 1,
144 "FIB too many sources");
147 * The maximum number of sources
149 #define FIB_SOURCE_MAX (FIB_SOURCE_LAST+1)
151 #define FIB_SOURCES { \
152 [FIB_SOURCE_SPECIAL] = "special", \
153 [FIB_SOURCE_INTERFACE] = "interface", \
154 [FIB_SOURCE_PROXY] = "proxy", \
155 [FIB_SOURCE_BIER] = "BIER", \
156 [FIB_SOURCE_API] = "API", \
157 [FIB_SOURCE_CLI] = "CLI", \
158 [FIB_SOURCE_ADJ] = "adjacency", \
159 [FIB_SOURCE_MAP] = "MAP", \
160 [FIB_SOURCE_SR] = "SR", \
161 [FIB_SOURCE_LISP] = "LISP", \
162 [FIB_SOURCE_CLASSIFY] = "classify", \
163 [FIB_SOURCE_DHCP] = "DHCP", \
164 [FIB_SOURCE_IP6_ND_PROXY] = "IPv6-proxy-nd", \
165 [FIB_SOURCE_IP6_ND] = "IPv6-nd", \
166 [FIB_SOURCE_RR] = "recursive-resolution", \
167 [FIB_SOURCE_AE] = "attached_export", \
168 [FIB_SOURCE_MPLS] = "mpls", \
169 [FIB_SOURCE_URPF_EXEMPT] = "urpf-exempt", \
170 [FIB_SOURCE_DEFAULT_ROUTE] = "default-route", \
171 [FIB_SOURCE_PLUGIN_HI] = "plugin-hi", \
172 [FIB_SOURCE_INTERPOSE] = "interpose", \
175 #define FOR_EACH_FIB_SOURCE(_item) \
176 for (_item = FIB_SOURCE_FIRST; _item < FIB_SOURCE_MAX; _item++)
179 * The different sources that can create a route.
180 * The sources are defined here the thier relative priority order.
181 * The lower the value the higher the priority
183 typedef enum fib_entry_attribute_t_ {
185 * Marker. Add new values after this one.
187 FIB_ENTRY_ATTRIBUTE_FIRST,
189 * Connected. The prefix is configured on an interface.
191 FIB_ENTRY_ATTRIBUTE_CONNECTED = FIB_ENTRY_ATTRIBUTE_FIRST,
193 * Attached. The prefix is attached to an interface.
195 FIB_ENTRY_ATTRIBUTE_ATTACHED,
197 * The route is an explicit drop.
199 FIB_ENTRY_ATTRIBUTE_DROP,
201 * The route is exclusive. The client creating the route is
202 * providing an exclusive adjacency.
204 FIB_ENTRY_ATTRIBUTE_EXCLUSIVE,
206 * The route is attached cross tables and thus imports covered
207 * prefixes from the other table.
209 FIB_ENTRY_ATTRIBUTE_IMPORT,
211 * The prefix/address is local to this device
213 FIB_ENTRY_ATTRIBUTE_LOCAL,
215 * The prefix/address is a multicast prefix.
216 * this aplies only to MPLS. IP multicast is handled by mfib
218 FIB_ENTRY_ATTRIBUTE_MULTICAST,
220 * The prefix/address exempted from loose uRPF check
221 * To be used with caution
223 FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT,
225 * The prefix/address exempted from attached export
227 FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT,
229 * This FIB entry imposes its source information on all prefixes
232 FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT,
234 * The interpose attribute.
235 * place the forwarding provided by the source infront of the forwarding
236 * provided by the best source, or failing that, by the cover.
238 FIB_ENTRY_ATTRIBUTE_INTERPOSE,
240 * Marker. add new entries before this one.
242 FIB_ENTRY_ATTRIBUTE_LAST = FIB_ENTRY_ATTRIBUTE_INTERPOSE,
243 } fib_entry_attribute_t;
245 #define FIB_ENTRY_ATTRIBUTES { \
246 [FIB_ENTRY_ATTRIBUTE_CONNECTED] = "connected", \
247 [FIB_ENTRY_ATTRIBUTE_ATTACHED] = "attached", \
248 [FIB_ENTRY_ATTRIBUTE_IMPORT] = "import", \
249 [FIB_ENTRY_ATTRIBUTE_DROP] = "drop", \
250 [FIB_ENTRY_ATTRIBUTE_EXCLUSIVE] = "exclusive", \
251 [FIB_ENTRY_ATTRIBUTE_LOCAL] = "local", \
252 [FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT] = "uRPF-exempt", \
253 [FIB_ENTRY_ATTRIBUTE_MULTICAST] = "multicast", \
254 [FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT] = "no-attached-export", \
255 [FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT] = "covered-inherit", \
256 [FIB_ENTRY_ATTRIBUTE_INTERPOSE] = "interpose", \
259 #define FOR_EACH_FIB_ATTRIBUTE(_item) \
260 for (_item = FIB_ENTRY_ATTRIBUTE_FIRST; \
261 _item <= FIB_ENTRY_ATTRIBUTE_LAST; \
264 typedef enum fib_entry_flag_t_ {
265 FIB_ENTRY_FLAG_NONE = 0,
266 FIB_ENTRY_FLAG_CONNECTED = (1 << FIB_ENTRY_ATTRIBUTE_CONNECTED),
267 FIB_ENTRY_FLAG_ATTACHED = (1 << FIB_ENTRY_ATTRIBUTE_ATTACHED),
268 FIB_ENTRY_FLAG_DROP = (1 << FIB_ENTRY_ATTRIBUTE_DROP),
269 FIB_ENTRY_FLAG_EXCLUSIVE = (1 << FIB_ENTRY_ATTRIBUTE_EXCLUSIVE),
270 FIB_ENTRY_FLAG_LOCAL = (1 << FIB_ENTRY_ATTRIBUTE_LOCAL),
271 FIB_ENTRY_FLAG_IMPORT = (1 << FIB_ENTRY_ATTRIBUTE_IMPORT),
272 FIB_ENTRY_FLAG_NO_ATTACHED_EXPORT = (1 << FIB_ENTRY_ATTRIBUTE_NO_ATTACHED_EXPORT),
273 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT = (1 << FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT),
274 FIB_ENTRY_FLAG_MULTICAST = (1 << FIB_ENTRY_ATTRIBUTE_MULTICAST),
275 FIB_ENTRY_FLAG_COVERED_INHERIT = (1 << FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT),
276 FIB_ENTRY_FLAG_INTERPOSE = (1 << FIB_ENTRY_ATTRIBUTE_INTERPOSE),
277 } __attribute__((packed)) fib_entry_flag_t;
280 * Flags for the source data
282 typedef enum fib_entry_src_attribute_t_ {
284 * Marker. Add new values after this one.
286 FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
288 * the source has been added to the entry
290 FIB_ENTRY_SRC_ATTRIBUTE_ADDED = FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
292 * the source is contributing forwarding
294 FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING,
296 * the source is active/best
298 FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE,
300 * the source is inherited from its cover
302 FIB_ENTRY_SRC_ATTRIBUTE_INHERITED,
304 * Marker. add new entries before this one.
306 FIB_ENTRY_SRC_ATTRIBUTE_LAST = FIB_ENTRY_SRC_ATTRIBUTE_INHERITED,
307 } fib_entry_src_attribute_t;
310 #define FIB_ENTRY_SRC_ATTRIBUTES { \
311 [FIB_ENTRY_SRC_ATTRIBUTE_ADDED] = "added", \
312 [FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING] = "contributing", \
313 [FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE] = "active", \
314 [FIB_ENTRY_SRC_ATTRIBUTE_INHERITED] = "inherited", \
317 #define FOR_EACH_FIB_SRC_ATTRIBUTE(_item) \
318 for (_item = FIB_ENTRY_SRC_ATTRIBUTE_FIRST; \
319 _item <= FIB_ENTRY_SRC_ATTRIBUTE_LAST; \
322 typedef enum fib_entry_src_flag_t_ {
323 FIB_ENTRY_SRC_FLAG_NONE = 0,
324 FIB_ENTRY_SRC_FLAG_ADDED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ADDED),
325 FIB_ENTRY_SRC_FLAG_CONTRIBUTING = (1 << FIB_ENTRY_SRC_ATTRIBUTE_CONTRIBUTING),
326 FIB_ENTRY_SRC_FLAG_ACTIVE = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE),
327 FIB_ENTRY_SRC_FLAG_INHERITED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_INHERITED),
328 } __attribute__ ((packed)) fib_entry_src_flag_t;
331 * Keep the size of the flags field to 2 bytes, so it
332 * can be placed next to the 2 bytes reference count
334 STATIC_ASSERT (sizeof(fib_entry_src_flag_t) <= 2,
335 "FIB entry flags field size too big");
338 * Information related to the source of a FIB entry
340 typedef struct fib_entry_src_t_ {
342 * A vector of path extensions
344 fib_path_ext_list_t fes_path_exts;
347 * The path-list created by the source
349 fib_node_index_t fes_pl;
352 * Flags the source contributes to the entry
354 fib_entry_flag_t fes_entry_flags;
357 * Which source this info block is for
359 fib_source_t fes_src;
362 * Flags on the source
364 fib_entry_src_flag_t fes_flags;
367 * 1 bytes ref count. This is not the number of users of the Entry
368 * (which is itself not large, due to path-list sharing), but the number
369 * of times a given source has been added. Which is even fewer
374 * Source specific info
379 * the index of the FIB entry that is the covering entry
381 fib_node_index_t fesr_cover;
383 * This source's index in the cover's list
389 * the index of the FIB entry that is the covering entry
391 fib_node_index_t fesi_cover;
393 * This source's index in the cover's list
397 * DPO type to interpose. The dpo type needs to have registered
398 * it's 'contribute interpose' callback function.
404 * the index of the FIB entry that is the covering entry
406 fib_node_index_t fesa_cover;
408 * This source's index in the cover's list
414 * the index of the FIB entry that is the covering entry
416 fib_node_index_t fesi_cover;
418 * This source's index in the cover's list
424 * This MPLS local label associated with the prefix.
426 mpls_label_t fesm_label;
429 * the indicies of the LFIB entries created
431 fib_node_index_t fesm_lfes[2];
435 * The source FIB index.
437 fib_node_index_t fesl_fib_index;
443 * An entry in a FIB table.
445 * This entry represents a route added to the FIB that is stored
446 * in one of the FIB tables.
448 typedef struct fib_entry_t_ {
450 * Base class. The entry's node representation in the graph.
454 * The prefix of the route. this is const just to be sure.
455 * It is the entry's key/identity and so should never change.
457 const fib_prefix_t fe_prefix;
459 * The index of the FIB table this entry is in
463 * The load-balance used for forwarding.
465 * We don't share the EOS and non-EOS even in case when they could be
467 * - complexity & reliability v. memory
468 * determining the conditions where sharing is possible is non-trivial.
469 * - separate LBs means we can get the EOS bit right in the MPLS label DPO
470 * and so save a few clock cycles in the DP imposition node since we can
471 * paint the header straight on without the need to check the packet
472 * type to derive the EOS bit value.
476 * Vector of source infos.
477 * Most entries will only have 1 source. So we optimise for memory usage,
478 * which is preferable since we have many entries.
480 fib_entry_src_t *fe_srcs;
482 * the path-list for which this entry is a child. This is also the path-list
483 * that is contributing forwarding for this entry.
485 fib_node_index_t fe_parent;
487 * index of this entry in the parent's child list.
488 * This is set when this entry is added as a child, but can also
489 * be changed by the parent as it manages its list.
494 * A vector of delegates.
496 fib_entry_delegate_t *fe_delegates;
499 #define FOR_EACH_FIB_ENTRY_FLAG(_item) \
500 for (_item = FIB_ENTRY_FLAG_FIRST; _item < FIB_ENTRY_FLAG_MAX; _item++)
502 #define FIB_ENTRY_FORMAT_BRIEF (0x0)
503 #define FIB_ENTRY_FORMAT_DETAIL (0x1)
504 #define FIB_ENTRY_FORMAT_DETAIL2 (0x2)
506 extern u8 *format_fib_entry (u8 * s, va_list * args);
507 extern u8 *format_fib_source (u8 * s, va_list * args);
509 extern fib_node_index_t fib_entry_create_special(u32 fib_index,
510 const fib_prefix_t *prefix,
512 fib_entry_flag_t flags,
513 const dpo_id_t *dpo);
515 extern fib_node_index_t fib_entry_create (u32 fib_index,
516 const fib_prefix_t *prefix,
518 fib_entry_flag_t flags,
519 const fib_route_path_t *paths);
520 extern void fib_entry_update (fib_node_index_t fib_entry_index,
522 fib_entry_flag_t flags,
523 const fib_route_path_t *paths);
525 extern void fib_entry_path_add(fib_node_index_t fib_entry_index,
527 fib_entry_flag_t flags,
528 const fib_route_path_t *rpath);
529 extern void fib_entry_special_add(fib_node_index_t fib_entry_index,
531 fib_entry_flag_t flags,
532 const dpo_id_t *dpo);
533 extern void fib_entry_special_update(fib_node_index_t fib_entry_index,
535 fib_entry_flag_t flags,
536 const dpo_id_t *dpo);
537 extern fib_entry_src_flag_t fib_entry_special_remove(fib_node_index_t fib_entry_index,
538 fib_source_t source);
540 extern fib_entry_src_flag_t fib_entry_path_remove(fib_node_index_t fib_entry_index,
542 const fib_route_path_t *rpath);
544 extern void fib_entry_inherit(fib_node_index_t cover,
545 fib_node_index_t covered);
547 extern fib_entry_src_flag_t fib_entry_delete(fib_node_index_t fib_entry_index,
548 fib_source_t source);
550 extern void fib_entry_recalculate_forwarding(
551 fib_node_index_t fib_entry_index);
552 extern void fib_entry_contribute_urpf(fib_node_index_t path_index,
554 extern void fib_entry_contribute_forwarding(
555 fib_node_index_t fib_entry_index,
556 fib_forward_chain_type_t type,
558 extern const dpo_id_t * fib_entry_contribute_ip_forwarding(
559 fib_node_index_t fib_entry_index);
560 extern adj_index_t fib_entry_get_adj_for_source(
561 fib_node_index_t fib_entry_index,
562 fib_source_t source);
563 extern const int fib_entry_get_dpo_for_source (
564 fib_node_index_t fib_entry_index,
568 extern adj_index_t fib_entry_get_adj(fib_node_index_t fib_entry_index);
570 extern int fib_entry_cmp_for_sort(void *i1, void *i2);
572 extern void fib_entry_cover_changed(fib_node_index_t fib_entry);
573 extern void fib_entry_cover_updated(fib_node_index_t fib_entry);
574 extern int fib_entry_recursive_loop_detect(fib_node_index_t entry_index,
575 fib_node_index_t **entry_indicies);
577 extern void fib_entry_lock(fib_node_index_t fib_entry_index);
578 extern void fib_entry_unlock(fib_node_index_t fib_entry_index);
580 extern u32 fib_entry_child_add(fib_node_index_t fib_entry_index,
581 fib_node_type_t type,
582 fib_node_index_t child_index);
583 extern void fib_entry_child_remove(fib_node_index_t fib_entry_index,
585 extern u32 fib_entry_get_resolving_interface(fib_node_index_t fib_entry_index);
586 extern u32 fib_entry_get_resolving_interface_for_source(
587 fib_node_index_t fib_entry_index,
588 fib_source_t source);
590 extern void fib_entry_encode(fib_node_index_t fib_entry_index,
591 fib_route_path_encode_t **api_rpaths);
592 extern void fib_entry_get_prefix(fib_node_index_t fib_entry_index,
594 extern u32 fib_entry_get_fib_index(fib_node_index_t fib_entry_index);
595 extern void fib_entry_set_source_data(fib_node_index_t fib_entry_index,
598 extern const void* fib_entry_get_source_data(fib_node_index_t fib_entry_index,
599 fib_source_t source);
601 extern fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index);
602 extern fib_entry_flag_t fib_entry_get_flags_for_source(
603 fib_node_index_t fib_entry_index,
604 fib_source_t source);
605 extern fib_source_t fib_entry_get_best_source(fib_node_index_t fib_entry_index);
606 extern int fib_entry_is_sourced(fib_node_index_t fib_entry_index,
607 fib_source_t source);
609 extern fib_node_index_t fib_entry_get_path_list(fib_node_index_t fib_entry_index);
610 extern int fib_entry_is_resolved(fib_node_index_t fib_entry_index);
611 extern void fib_entry_set_flow_hash_config(fib_node_index_t fib_entry_index,
612 flow_hash_config_t hash_config);
614 extern void fib_entry_module_init(void);
617 * unsafe... beware the raw pointer.
619 extern fib_node_index_t fib_entry_get_index(const fib_entry_t * fib_entry);
620 extern fib_entry_t * fib_entry_get(fib_node_index_t fib_entry_index);
623 * for testing purposes.
625 extern u32 fib_entry_pool_size(void);