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/vnet.h>
18 #include <vnet/ip/format.h>
19 #include <vnet/ip/ip.h>
20 #include <vnet/dpo/drop_dpo.h>
21 #include <vnet/dpo/receive_dpo.h>
22 #include <vnet/dpo/load_balance_map.h>
23 #include <vnet/dpo/lookup_dpo.h>
24 #include <vnet/dpo/interface_rx_dpo.h>
25 #include <vnet/dpo/mpls_disposition.h>
26 #include <vnet/dpo/dvr_dpo.h>
27 #include <vnet/dpo/ip_null_dpo.h>
28 #include <vnet/dpo/classify_dpo.h>
29 #include <vnet/dpo/pw_cw.h>
31 #include <vnet/adj/adj.h>
32 #include <vnet/adj/adj_mcast.h>
34 #include <vnet/fib/fib_path.h>
35 #include <vnet/fib/fib_node.h>
36 #include <vnet/fib/fib_table.h>
37 #include <vnet/fib/fib_entry.h>
38 #include <vnet/fib/fib_path_list.h>
39 #include <vnet/fib/fib_internal.h>
40 #include <vnet/fib/fib_urpf_list.h>
41 #include <vnet/fib/mpls_fib.h>
42 #include <vnet/fib/fib_path_ext.h>
43 #include <vnet/udp/udp_encap.h>
44 #include <vnet/bier/bier_fmask.h>
45 #include <vnet/bier/bier_table.h>
46 #include <vnet/bier/bier_imp.h>
47 #include <vnet/bier/bier_disp_table.h>
50 * Enurmeration of path types
52 typedef enum fib_path_type_t_ {
54 * Marker. Add new types after this one.
56 FIB_PATH_TYPE_FIRST = 0,
58 * Attached-nexthop. An interface and a nexthop are known.
60 FIB_PATH_TYPE_ATTACHED_NEXT_HOP = FIB_PATH_TYPE_FIRST,
62 * attached. Only the interface is known.
64 FIB_PATH_TYPE_ATTACHED,
66 * recursive. Only the next-hop is known.
68 FIB_PATH_TYPE_RECURSIVE,
70 * special. nothing is known. so we drop.
72 FIB_PATH_TYPE_SPECIAL,
74 * exclusive. user provided adj.
76 FIB_PATH_TYPE_EXCLUSIVE,
78 * deag. Link to a lookup adj in the next table
84 FIB_PATH_TYPE_INTF_RX,
86 * Path resolves via a UDP encap object.
88 FIB_PATH_TYPE_UDP_ENCAP,
90 * receive. it's for-us.
92 FIB_PATH_TYPE_RECEIVE,
94 * bier-imp. it's via a BIER imposition.
96 FIB_PATH_TYPE_BIER_IMP,
98 * bier-fmask. it's via a BIER ECMP-table.
100 FIB_PATH_TYPE_BIER_TABLE,
102 * bier-fmask. it's via a BIER f-mask.
104 FIB_PATH_TYPE_BIER_FMASK,
109 } __attribute__ ((packed)) fib_path_type_t;
111 #define FIB_PATH_TYPES { \
112 [FIB_PATH_TYPE_ATTACHED_NEXT_HOP] = "attached-nexthop", \
113 [FIB_PATH_TYPE_ATTACHED] = "attached", \
114 [FIB_PATH_TYPE_RECURSIVE] = "recursive", \
115 [FIB_PATH_TYPE_SPECIAL] = "special", \
116 [FIB_PATH_TYPE_EXCLUSIVE] = "exclusive", \
117 [FIB_PATH_TYPE_DEAG] = "deag", \
118 [FIB_PATH_TYPE_INTF_RX] = "intf-rx", \
119 [FIB_PATH_TYPE_UDP_ENCAP] = "udp-encap", \
120 [FIB_PATH_TYPE_RECEIVE] = "receive", \
121 [FIB_PATH_TYPE_BIER_IMP] = "bier-imp", \
122 [FIB_PATH_TYPE_BIER_TABLE] = "bier-table", \
123 [FIB_PATH_TYPE_BIER_FMASK] = "bier-fmask", \
124 [FIB_PATH_TYPE_DVR] = "dvr", \
128 * Enurmeration of path operational (i.e. derived) attributes
130 typedef enum fib_path_oper_attribute_t_ {
132 * Marker. Add new types after this one.
134 FIB_PATH_OPER_ATTRIBUTE_FIRST = 0,
136 * The path forms part of a recursive loop.
138 FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP = FIB_PATH_OPER_ATTRIBUTE_FIRST,
140 * The path is resolved
142 FIB_PATH_OPER_ATTRIBUTE_RESOLVED,
144 * The path has become a permanent drop.
146 FIB_PATH_OPER_ATTRIBUTE_DROP,
148 * Marker. Add new types before this one, then update it.
150 FIB_PATH_OPER_ATTRIBUTE_LAST = FIB_PATH_OPER_ATTRIBUTE_DROP,
151 } __attribute__ ((packed)) fib_path_oper_attribute_t;
154 * The maximum number of path operational attributes
156 #define FIB_PATH_OPER_ATTRIBUTE_MAX (FIB_PATH_OPER_ATTRIBUTE_LAST + 1)
158 #define FIB_PATH_OPER_ATTRIBUTES { \
159 [FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP] = "recursive-loop", \
160 [FIB_PATH_OPER_ATTRIBUTE_RESOLVED] = "resolved", \
161 [FIB_PATH_OPER_ATTRIBUTE_DROP] = "drop", \
164 #define FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(_item) \
165 for (_item = FIB_PATH_OPER_ATTRIBUTE_FIRST; \
166 _item <= FIB_PATH_OPER_ATTRIBUTE_LAST; \
170 * Path flags from the attributes
172 typedef enum fib_path_oper_flags_t_ {
173 FIB_PATH_OPER_FLAG_NONE = 0,
174 FIB_PATH_OPER_FLAG_RECURSIVE_LOOP = (1 << FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP),
175 FIB_PATH_OPER_FLAG_DROP = (1 << FIB_PATH_OPER_ATTRIBUTE_DROP),
176 FIB_PATH_OPER_FLAG_RESOLVED = (1 << FIB_PATH_OPER_ATTRIBUTE_RESOLVED),
177 } __attribute__ ((packed)) fib_path_oper_flags_t;
182 typedef struct fib_path_t_ {
184 * A path is a node in the FIB graph.
189 * The index of the path-list to which this path belongs
194 * This marks the start of the memory area used to hash
197 STRUCT_MARK(path_hash_start);
200 * Configuration Flags
202 fib_path_cfg_flags_t fp_cfg_flags;
205 * The type of the path. This is the selector for the union
207 fib_path_type_t fp_type;
210 * The protocol of the next-hop, i.e. the address family of the
211 * next-hop's address. We can't derive this from the address itself
212 * since the address can be all zeros
214 dpo_proto_t fp_nh_proto;
217 * UCMP [unnormalised] weigth
222 * A path preference. 0 is the best.
223 * Only paths of the best preference, that are 'up', are considered
229 * per-type union of the data required to resolve the path
236 ip46_address_t fp_nh;
244 * The Connected local address
246 fib_prefix_t fp_connected;
258 ip46_address_t fp_ip;
261 * The local label to resolve through.
263 mpls_label_t fp_local_label;
265 * The EOS bit of the resolving label
267 mpls_eos_bit_t fp_eos;
271 * The FIB table index in which to find the next-hop.
273 fib_node_index_t fp_tbl_id;
279 index_t fp_bier_fmask;
283 * The BIER table's ID
285 bier_table_id_t fp_bier_tbl;
289 * The BIER imposition object
290 * this is part of the path's key, since the index_t
291 * of an imposition object is the object's key.
297 * The FIB index in which to perfom the next lookup
299 fib_node_index_t fp_tbl_id;
301 * The RPF-ID to tag the packets with
303 fib_rpf_id_t fp_rpf_id;
309 * The user provided 'exclusive' DPO
315 * The interface on which the local address is configured
321 ip46_address_t fp_addr;
325 * The interface on which the packets will be input.
331 * The UDP Encap object this path resolves through
337 * The UDP Encap object this path resolves through
339 u32 fp_classify_table_id;
348 STRUCT_MARK(path_hash_end);
351 * Members in this last section represent information that is
352 * dervied during resolution. It should not be copied to new paths
359 fib_path_oper_flags_t fp_oper_flags;
363 * the resolving via fib. not part of the union, since it it not part
364 * of the path's hash.
366 fib_node_index_t fp_via_fib;
368 * the resolving bier-table
370 index_t fp_via_bier_tbl;
372 * the resolving bier-fmask
374 index_t fp_via_bier_fmask;
378 * The Data-path objects through which this path resolves for IP.
383 * the index of this path in the parent's child list.
389 * Array of strings/names for the path types and attributes
391 static const char *fib_path_type_names[] = FIB_PATH_TYPES;
392 static const char *fib_path_oper_attribute_names[] = FIB_PATH_OPER_ATTRIBUTES;
393 static const char *fib_path_cfg_attribute_names[] = FIB_PATH_CFG_ATTRIBUTES;
396 * The memory pool from which we allocate all the paths
398 static fib_path_t *fib_path_pool;
403 vlib_log_class_t fib_path_logger;
408 #define FIB_PATH_DBG(_p, _fmt, _args...) \
410 vlib_log_debug (fib_path_logger, \
412 format_fib_path, fib_path_get_index(_p), 0, \
413 FIB_PATH_FORMAT_FLAGS_ONE_LINE, \
418 fib_path_get (fib_node_index_t index)
420 return (pool_elt_at_index(fib_path_pool, index));
423 static fib_node_index_t
424 fib_path_get_index (fib_path_t *path)
426 return (path - fib_path_pool);
430 fib_path_get_node (fib_node_index_t index)
432 return ((fib_node_t*)fib_path_get(index));
436 fib_path_from_fib_node (fib_node_t *node)
438 ASSERT(FIB_NODE_TYPE_PATH == node->fn_type);
439 return ((fib_path_t*)node);
443 format_fib_path (u8 * s, va_list * args)
445 fib_node_index_t path_index = va_arg (*args, fib_node_index_t);
446 u32 indent = va_arg (*args, u32);
447 fib_format_path_flags_t flags = va_arg (*args, fib_format_path_flags_t);
448 vnet_main_t * vnm = vnet_get_main();
449 fib_path_oper_attribute_t oattr;
450 fib_path_cfg_attribute_t cattr;
454 if (flags & FIB_PATH_FORMAT_FLAGS_ONE_LINE)
463 path = fib_path_get(path_index);
465 s = format (s, "%Upath:[%d] ", format_white_space, indent,
466 fib_path_get_index(path));
467 s = format (s, "pl-index:%d ", path->fp_pl_index);
468 s = format (s, "%U ", format_dpo_proto, path->fp_nh_proto);
469 s = format (s, "weight=%d ", path->fp_weight);
470 s = format (s, "pref=%d ", path->fp_preference);
471 s = format (s, "%s: ", fib_path_type_names[path->fp_type]);
472 if (FIB_PATH_OPER_FLAG_NONE != path->fp_oper_flags) {
473 s = format(s, " oper-flags:");
474 FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(oattr) {
475 if ((1<<oattr) & path->fp_oper_flags) {
476 s = format (s, "%s,", fib_path_oper_attribute_names[oattr]);
480 if (FIB_PATH_CFG_FLAG_NONE != path->fp_cfg_flags) {
481 s = format(s, " cfg-flags:");
482 FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(cattr) {
483 if ((1<<cattr) & path->fp_cfg_flags) {
484 s = format (s, "%s,", fib_path_cfg_attribute_names[cattr]);
488 if (!(flags & FIB_PATH_FORMAT_FLAGS_ONE_LINE))
489 s = format(s, "\n%U", format_white_space, indent+2);
491 switch (path->fp_type)
493 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
494 s = format (s, "%U", format_ip46_address,
495 &path->attached_next_hop.fp_nh,
497 if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP)
499 s = format (s, " if_index:%d", path->attached_next_hop.fp_interface);
503 s = format (s, " %U",
504 format_vnet_sw_interface_name,
506 vnet_get_sw_interface(
508 path->attached_next_hop.fp_interface));
509 if (vnet_sw_interface_is_p2p(vnet_get_main(),
510 path->attached_next_hop.fp_interface))
512 s = format (s, " (p2p)");
515 if (!dpo_id_is_valid(&path->fp_dpo))
517 s = format(s, "%s%Uunresolved", eol, format_white_space, indent+2);
521 s = format(s, "%s%U%U", eol,
522 format_white_space, indent,
527 case FIB_PATH_TYPE_ATTACHED:
528 if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP)
530 s = format (s, "if_index:%d", path->attached_next_hop.fp_interface);
534 s = format (s, " %U",
535 format_vnet_sw_interface_name,
537 vnet_get_sw_interface(
539 path->attached.fp_interface));
542 case FIB_PATH_TYPE_RECURSIVE:
543 if (DPO_PROTO_MPLS == path->fp_nh_proto)
545 s = format (s, "via %U %U",
546 format_mpls_unicast_label,
547 path->recursive.fp_nh.fp_local_label,
549 path->recursive.fp_nh.fp_eos);
553 s = format (s, "via %U",
555 &path->recursive.fp_nh.fp_ip,
558 s = format (s, " in fib:%d",
559 path->recursive.fp_tbl_id,
561 s = format (s, " via-fib:%d", path->fp_via_fib);
562 s = format (s, " via-dpo:[%U:%d]",
563 format_dpo_type, path->fp_dpo.dpoi_type,
564 path->fp_dpo.dpoi_index);
567 case FIB_PATH_TYPE_UDP_ENCAP:
568 s = format (s, "UDP-encap ID:%d", path->udp_encap.fp_udp_encap_id);
570 case FIB_PATH_TYPE_BIER_TABLE:
571 s = format (s, "via bier-table:[%U}",
572 format_bier_table_id,
573 &path->bier_table.fp_bier_tbl);
574 s = format (s, " via-dpo:[%U:%d]",
575 format_dpo_type, path->fp_dpo.dpoi_type,
576 path->fp_dpo.dpoi_index);
578 case FIB_PATH_TYPE_BIER_FMASK:
579 s = format (s, "via-fmask:%d", path->bier_fmask.fp_bier_fmask);
580 s = format (s, " via-dpo:[%U:%d]",
581 format_dpo_type, path->fp_dpo.dpoi_type,
582 path->fp_dpo.dpoi_index);
584 case FIB_PATH_TYPE_BIER_IMP:
585 s = format (s, "via %U", format_bier_imp,
586 path->bier_imp.fp_bier_imp, 0, BIER_SHOW_BRIEF);
588 case FIB_PATH_TYPE_DVR:
589 s = format (s, " %U",
590 format_vnet_sw_interface_name,
592 vnet_get_sw_interface(
594 path->dvr.fp_interface));
596 case FIB_PATH_TYPE_DEAG:
597 s = format (s, " %sfib-index:%d",
598 (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID ? "m" : ""),
599 path->deag.fp_tbl_id);
601 case FIB_PATH_TYPE_RECEIVE:
602 case FIB_PATH_TYPE_INTF_RX:
603 case FIB_PATH_TYPE_SPECIAL:
604 case FIB_PATH_TYPE_EXCLUSIVE:
605 if (dpo_id_is_valid(&path->fp_dpo))
607 s = format(s, "%U", format_dpo_id,
608 &path->fp_dpo, indent+2);
616 * fib_path_last_lock_gone
618 * We don't share paths, we share path lists, so the [un]lock functions
622 fib_path_last_lock_gone (fib_node_t *node)
628 fib_path_attached_next_hop_get_adj (fib_path_t *path,
632 fib_node_index_t fib_path_index;
633 fib_protocol_t nh_proto;
636 fib_path_index = fib_path_get_index(path);
637 nh_proto = dpo_proto_to_fib(path->fp_nh_proto);
639 if (vnet_sw_interface_is_p2p(vnet_get_main(),
640 path->attached_next_hop.fp_interface))
643 * if the interface is p2p then the adj for the specific
644 * neighbour on that link will never exist. on p2p links
645 * the subnet address (the attached route) links to the
646 * auto-adj (see below), we want that adj here too.
648 ai = adj_nbr_add_or_lock(nh_proto, link, &zero_addr,
649 path->attached_next_hop.fp_interface);
653 ai = adj_nbr_add_or_lock(nh_proto, link,
654 &path->attached_next_hop.fp_nh,
655 path->attached_next_hop.fp_interface);
658 dpo_set(dpo, DPO_ADJACENCY, vnet_link_to_dpo_proto(link), ai);
661 return (fib_path_get(fib_path_index));
665 fib_path_attached_next_hop_set (fib_path_t *path)
667 dpo_id_t tmp = DPO_INVALID;
670 * resolve directly via the adjacency discribed by the
671 * interface and next-hop
673 dpo_copy (&tmp, &path->fp_dpo);
674 path = fib_path_attached_next_hop_get_adj(path,
675 dpo_proto_to_link(path->fp_nh_proto),
677 dpo_copy(&path->fp_dpo, &tmp);
679 ASSERT(dpo_is_adj(&path->fp_dpo));
682 * become a child of the adjacency so we receive updates
683 * when its rewrite changes
685 path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index,
687 fib_path_get_index(path));
689 if (!vnet_sw_interface_is_up(vnet_get_main(),
690 path->attached_next_hop.fp_interface) ||
691 !adj_is_up(path->fp_dpo.dpoi_index))
693 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
698 fib_path_attached_get_adj (fib_path_t *path,
702 fib_protocol_t nh_proto;
704 nh_proto = dpo_proto_to_fib(path->fp_nh_proto);
706 if (vnet_sw_interface_is_p2p(vnet_get_main(),
707 path->attached.fp_interface))
710 * point-2-point interfaces do not require a glean, since
711 * there is nothing to ARP. Install a rewrite/nbr adj instead
715 ai = adj_nbr_add_or_lock(nh_proto, link, &zero_addr,
716 path->attached.fp_interface);
718 dpo_set(dpo, DPO_ADJACENCY, vnet_link_to_dpo_proto(link), ai);
721 else if (vnet_sw_interface_is_nbma(vnet_get_main(),
722 path->attached.fp_interface))
724 dpo_copy(dpo, drop_dpo_get(path->fp_nh_proto));
730 ai = adj_glean_add_or_lock(nh_proto, link,
731 path->attached.fp_interface,
732 &path->attached.fp_connected);
733 dpo_set(dpo, DPO_ADJACENCY_GLEAN, vnet_link_to_dpo_proto(link), ai);
739 * create of update the paths recursive adj
742 fib_path_recursive_adj_update (fib_path_t *path,
743 fib_forward_chain_type_t fct,
746 dpo_id_t via_dpo = DPO_INVALID;
749 * get the DPO to resolve through from the via-entry
751 fib_entry_contribute_forwarding(path->fp_via_fib,
757 * hope for the best - clear if restrictions apply.
759 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
762 * Validate any recursion constraints and over-ride the via
765 if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP)
767 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
768 dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
770 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST)
773 * the via FIB must be a host route.
774 * note the via FIB just added will always be a host route
775 * since it is an RR source added host route. So what we need to
776 * check is whether the route has other sources. If it does then
777 * some other source has added it as a host route. If it doesn't
778 * then it was added only here and inherits forwarding from a cover.
779 * the cover is not a host route.
780 * The RR source is the lowest priority source, so we check if it
781 * is the best. if it is there are no other sources.
783 if (fib_entry_get_best_source(path->fp_via_fib) >= FIB_SOURCE_RR)
785 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
786 dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
789 * PIC edge trigger. let the load-balance maps know
791 load_balance_map_path_state_change(fib_path_get_index(path));
794 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED)
797 * RR source entries inherit the flags from the cover, so
798 * we can check the via directly
800 if (!(FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags(path->fp_via_fib)))
802 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
803 dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
806 * PIC edge trigger. let the load-balance maps know
808 load_balance_map_path_state_change(fib_path_get_index(path));
812 * check for over-riding factors on the FIB entry itself
814 if (!fib_entry_is_resolved(path->fp_via_fib))
816 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
817 dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
820 * PIC edge trigger. let the load-balance maps know
822 load_balance_map_path_state_change(fib_path_get_index(path));
826 * If this path is contributing a drop, then it's not resolved
828 if (dpo_is_drop(&via_dpo) || load_balance_is_drop(&via_dpo))
830 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
834 * update the path's contributed DPO
836 dpo_copy(dpo, &via_dpo);
838 FIB_PATH_DBG(path, "recursive update:");
844 * re-evaulate the forwarding state for a via fmask path
847 fib_path_bier_fmask_update (fib_path_t *path,
850 bier_fmask_contribute_forwarding(path->bier_fmask.fp_bier_fmask, dpo);
853 * if we are stakcing on the drop, then the path is not resolved
855 if (dpo_is_drop(dpo))
857 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
861 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
866 * fib_path_is_permanent_drop
868 * Return !0 if the path is configured to permanently drop,
869 * despite other attributes.
872 fib_path_is_permanent_drop (fib_path_t *path)
874 return ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DROP) ||
875 (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP));
881 * Remove our dependency on the resolution target
884 fib_path_unresolve (fib_path_t *path)
887 * the forced drop path does not need unresolving
889 if (fib_path_is_permanent_drop(path))
894 switch (path->fp_type)
896 case FIB_PATH_TYPE_RECURSIVE:
897 if (FIB_NODE_INDEX_INVALID != path->fp_via_fib)
899 fib_entry_child_remove(path->fp_via_fib,
901 fib_table_entry_special_remove(path->recursive.fp_tbl_id,
902 fib_entry_get_prefix(path->fp_via_fib),
904 fib_table_unlock(path->recursive.fp_tbl_id,
905 dpo_proto_to_fib(path->fp_nh_proto),
907 path->fp_via_fib = FIB_NODE_INDEX_INVALID;
910 case FIB_PATH_TYPE_BIER_FMASK:
911 bier_fmask_child_remove(path->fp_via_bier_fmask,
914 case FIB_PATH_TYPE_BIER_IMP:
915 bier_imp_unlock(path->fp_dpo.dpoi_index);
917 case FIB_PATH_TYPE_BIER_TABLE:
918 bier_table_ecmp_unlock(path->fp_via_bier_tbl);
920 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
921 case FIB_PATH_TYPE_ATTACHED:
922 if (dpo_is_adj(&path->fp_dpo))
923 adj_child_remove(path->fp_dpo.dpoi_index,
926 case FIB_PATH_TYPE_UDP_ENCAP:
927 udp_encap_unlock(path->fp_dpo.dpoi_index);
929 case FIB_PATH_TYPE_EXCLUSIVE:
930 dpo_reset(&path->exclusive.fp_ex_dpo);
932 case FIB_PATH_TYPE_SPECIAL:
933 case FIB_PATH_TYPE_RECEIVE:
934 case FIB_PATH_TYPE_INTF_RX:
935 case FIB_PATH_TYPE_DEAG:
936 case FIB_PATH_TYPE_DVR:
938 * these hold only the path's DPO, which is reset below.
944 * release the adj we were holding and pick up the
947 dpo_reset(&path->fp_dpo);
948 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
953 static fib_forward_chain_type_t
954 fib_path_to_chain_type (const fib_path_t *path)
956 if (DPO_PROTO_MPLS == path->fp_nh_proto)
958 if (FIB_PATH_TYPE_RECURSIVE == path->fp_type &&
959 MPLS_EOS == path->recursive.fp_nh.fp_eos)
961 return (FIB_FORW_CHAIN_TYPE_MPLS_EOS);
965 return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
970 return (fib_forw_chain_type_from_dpo_proto(path->fp_nh_proto));
975 * fib_path_back_walk_notify
977 * A back walk has reach this path.
979 static fib_node_back_walk_rc_t
980 fib_path_back_walk_notify (fib_node_t *node,
981 fib_node_back_walk_ctx_t *ctx)
985 path = fib_path_from_fib_node(node);
987 FIB_PATH_DBG(path, "bw:%U",
988 format_fib_node_bw_reason, ctx->fnbw_reason);
990 switch (path->fp_type)
992 case FIB_PATH_TYPE_RECURSIVE:
993 if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason)
996 * modify the recursive adjacency to use the new forwarding
998 * this update is visible to packets in flight in the DP.
1000 fib_path_recursive_adj_update(
1002 fib_path_to_chain_type(path),
1005 if ((FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) ||
1006 (FIB_NODE_BW_REASON_FLAG_ADJ_MTU & ctx->fnbw_reason) ||
1007 (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason))
1010 * ADJ updates (complete<->incomplete) do not need to propagate to
1011 * recursive entries.
1012 * The only reason its needed as far back as here, is that the adj
1013 * and the incomplete adj are a different DPO type, so the LBs need
1015 * If this walk was quashed in the fib_entry, then any non-fib_path
1016 * children (like tunnels that collapse out the LB when they stack)
1017 * would not see the update.
1019 return (FIB_NODE_BACK_WALK_CONTINUE);
1022 case FIB_PATH_TYPE_BIER_FMASK:
1023 if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason)
1026 * update to use the BIER fmask's new forwading
1028 fib_path_bier_fmask_update(path, &path->fp_dpo);
1030 if ((FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) ||
1031 (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason))
1034 * ADJ updates (complete<->incomplete) do not need to propagate to
1035 * recursive entries.
1036 * The only reason its needed as far back as here, is that the adj
1037 * and the incomplete adj are a different DPO type, so the LBs need
1039 * If this walk was quashed in the fib_entry, then any non-fib_path
1040 * children (like tunnels that collapse out the LB when they stack)
1041 * would not see the update.
1043 return (FIB_NODE_BACK_WALK_CONTINUE);
1046 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
1049 * ADJ_UPDATE backwalk pass silently through here and up to
1050 * the path-list when the multipath adj collapse occurs.
1051 * The reason we do this is that the assumtption is that VPP
1052 * runs in an environment where the Control-Plane is remote
1053 * and hence reacts slowly to link up down. In order to remove
1054 * this down link from the ECMP set quickly, we back-walk.
1055 * VPP also has dedicated CPUs, so we are not stealing resources
1056 * from the CP to do so.
1058 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason)
1060 if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED)
1063 * alreday resolved. no need to walk back again
1065 return (FIB_NODE_BACK_WALK_CONTINUE);
1067 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
1069 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason)
1071 if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED))
1074 * alreday unresolved. no need to walk back again
1076 return (FIB_NODE_BACK_WALK_CONTINUE);
1078 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1080 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
1083 * The interface this path resolves through has been deleted.
1084 * This will leave the path in a permanent drop state. The route
1085 * needs to be removed and readded (and hence the path-list deleted)
1086 * before it can forward again.
1088 fib_path_unresolve(path);
1089 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP;
1091 if (FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason)
1094 * restack the DPO to pick up the correct DPO sub-type
1096 dpo_id_t tmp = DPO_INVALID;
1099 if_is_up = vnet_sw_interface_is_up(
1101 path->attached_next_hop.fp_interface);
1103 dpo_copy (&tmp, &path->fp_dpo);
1104 path = fib_path_attached_next_hop_get_adj(
1106 dpo_proto_to_link(path->fp_nh_proto),
1108 dpo_copy(&path->fp_dpo, &tmp);
1111 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1112 if (if_is_up && adj_is_up(path->fp_dpo.dpoi_index))
1114 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
1120 * If the interface is not up there is no reason to walk
1121 * back to children. if we did they would only evalute
1122 * that this path is unresolved and hence it would
1123 * not contribute the adjacency - so it would be wasted
1126 return (FIB_NODE_BACK_WALK_CONTINUE);
1129 if (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason)
1131 if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED))
1134 * alreday unresolved. no need to walk back again
1136 return (FIB_NODE_BACK_WALK_CONTINUE);
1139 * the adj has gone down. the path is no longer resolved.
1141 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1144 case FIB_PATH_TYPE_ATTACHED:
1145 case FIB_PATH_TYPE_DVR:
1147 * FIXME; this could schedule a lower priority walk, since attached
1148 * routes are not usually in ECMP configurations so the backwalk to
1149 * the FIB entry does not need to be high priority
1151 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason)
1153 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
1155 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason)
1157 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1159 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
1161 fib_path_unresolve(path);
1162 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP;
1164 if (FIB_NODE_BW_REASON_FLAG_INTERFACE_BIND & ctx->fnbw_reason)
1166 /* bind walks should appear here and pass silently up to
1167 * to the fib_entry */
1170 case FIB_PATH_TYPE_UDP_ENCAP:
1172 dpo_id_t via_dpo = DPO_INVALID;
1175 * hope for the best - clear if restrictions apply.
1177 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
1179 udp_encap_contribute_forwarding(path->udp_encap.fp_udp_encap_id,
1183 * If this path is contributing a drop, then it's not resolved
1185 if (dpo_is_drop(&via_dpo) || load_balance_is_drop(&via_dpo))
1187 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1191 * update the path's contributed DPO
1193 dpo_copy(&path->fp_dpo, &via_dpo);
1194 dpo_reset(&via_dpo);
1197 case FIB_PATH_TYPE_INTF_RX:
1199 case FIB_PATH_TYPE_DEAG:
1201 * FIXME When VRF delete is allowed this will need a poke.
1203 case FIB_PATH_TYPE_SPECIAL:
1204 case FIB_PATH_TYPE_RECEIVE:
1205 case FIB_PATH_TYPE_EXCLUSIVE:
1206 case FIB_PATH_TYPE_BIER_TABLE:
1207 case FIB_PATH_TYPE_BIER_IMP:
1209 * these path types have no parents. so to be
1210 * walked from one is unexpected.
1217 * propagate the backwalk further to the path-list
1219 fib_path_list_back_walk(path->fp_pl_index, ctx);
1221 return (FIB_NODE_BACK_WALK_CONTINUE);
1225 fib_path_memory_show (void)
1227 fib_show_memory_usage("Path",
1228 pool_elts(fib_path_pool),
1229 pool_len(fib_path_pool),
1230 sizeof(fib_path_t));
1234 * The FIB path's graph node virtual function table
1236 static const fib_node_vft_t fib_path_vft = {
1237 .fnv_get = fib_path_get_node,
1238 .fnv_last_lock = fib_path_last_lock_gone,
1239 .fnv_back_walk = fib_path_back_walk_notify,
1240 .fnv_mem_show = fib_path_memory_show,
1243 static fib_path_cfg_flags_t
1244 fib_path_route_flags_to_cfg_flags (const fib_route_path_t *rpath)
1246 fib_path_cfg_flags_t cfg_flags = FIB_PATH_CFG_FLAG_NONE;
1248 if (rpath->frp_flags & FIB_ROUTE_PATH_POP_PW_CW)
1249 cfg_flags |= FIB_PATH_CFG_FLAG_POP_PW_CW;
1250 if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_HOST)
1251 cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_HOST;
1252 if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED)
1253 cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED;
1254 if (rpath->frp_flags & FIB_ROUTE_PATH_LOCAL)
1255 cfg_flags |= FIB_PATH_CFG_FLAG_LOCAL;
1256 if (rpath->frp_flags & FIB_ROUTE_PATH_ATTACHED)
1257 cfg_flags |= FIB_PATH_CFG_FLAG_ATTACHED;
1258 if (rpath->frp_flags & FIB_ROUTE_PATH_INTF_RX)
1259 cfg_flags |= FIB_PATH_CFG_FLAG_INTF_RX;
1260 if (rpath->frp_flags & FIB_ROUTE_PATH_RPF_ID)
1261 cfg_flags |= FIB_PATH_CFG_FLAG_RPF_ID;
1262 if (rpath->frp_flags & FIB_ROUTE_PATH_EXCLUSIVE)
1263 cfg_flags |= FIB_PATH_CFG_FLAG_EXCLUSIVE;
1264 if (rpath->frp_flags & FIB_ROUTE_PATH_DROP)
1265 cfg_flags |= FIB_PATH_CFG_FLAG_DROP;
1266 if (rpath->frp_flags & FIB_ROUTE_PATH_SOURCE_LOOKUP)
1267 cfg_flags |= FIB_PATH_CFG_FLAG_DEAG_SRC;
1268 if (rpath->frp_flags & FIB_ROUTE_PATH_ICMP_UNREACH)
1269 cfg_flags |= FIB_PATH_CFG_FLAG_ICMP_UNREACH;
1270 if (rpath->frp_flags & FIB_ROUTE_PATH_ICMP_PROHIBIT)
1271 cfg_flags |= FIB_PATH_CFG_FLAG_ICMP_PROHIBIT;
1272 if (rpath->frp_flags & FIB_ROUTE_PATH_GLEAN)
1273 cfg_flags |= FIB_PATH_CFG_FLAG_GLEAN;
1281 * Create and initialise a new path object.
1282 * return the index of the path.
1285 fib_path_create (fib_node_index_t pl_index,
1286 const fib_route_path_t *rpath)
1290 pool_get(fib_path_pool, path);
1291 clib_memset(path, 0, sizeof(*path));
1293 fib_node_init(&path->fp_node,
1294 FIB_NODE_TYPE_PATH);
1296 dpo_reset(&path->fp_dpo);
1297 path->fp_pl_index = pl_index;
1298 path->fp_nh_proto = rpath->frp_proto;
1299 path->fp_via_fib = FIB_NODE_INDEX_INVALID;
1300 path->fp_weight = rpath->frp_weight;
1301 if (0 == path->fp_weight)
1304 * a weight of 0 is a meaningless value. We could either reject it, and thus force
1305 * clients to always use 1, or we can accept it and fixup approrpiately.
1307 path->fp_weight = 1;
1309 path->fp_preference = rpath->frp_preference;
1310 path->fp_cfg_flags = fib_path_route_flags_to_cfg_flags(rpath);
1313 * deduce the path's tpye from the parementers and save what is needed.
1315 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_LOCAL)
1317 path->fp_type = FIB_PATH_TYPE_RECEIVE;
1318 path->receive.fp_interface = rpath->frp_sw_if_index;
1319 path->receive.fp_addr = rpath->frp_addr;
1321 else if (rpath->frp_flags & FIB_ROUTE_PATH_UDP_ENCAP)
1323 path->fp_type = FIB_PATH_TYPE_UDP_ENCAP;
1324 path->udp_encap.fp_udp_encap_id = rpath->frp_udp_encap_id;
1326 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_INTF_RX)
1328 path->fp_type = FIB_PATH_TYPE_INTF_RX;
1329 path->intf_rx.fp_interface = rpath->frp_sw_if_index;
1331 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID)
1333 path->fp_type = FIB_PATH_TYPE_DEAG;
1334 path->deag.fp_tbl_id = rpath->frp_fib_index;
1335 path->deag.fp_rpf_id = rpath->frp_rpf_id;
1337 else if (rpath->frp_flags & FIB_ROUTE_PATH_BIER_FMASK)
1339 path->fp_type = FIB_PATH_TYPE_BIER_FMASK;
1340 path->bier_fmask.fp_bier_fmask = rpath->frp_bier_fmask;
1342 else if (rpath->frp_flags & FIB_ROUTE_PATH_BIER_IMP)
1344 path->fp_type = FIB_PATH_TYPE_BIER_IMP;
1345 path->bier_imp.fp_bier_imp = rpath->frp_bier_imp;
1347 else if (rpath->frp_flags & FIB_ROUTE_PATH_BIER_TABLE)
1349 path->fp_type = FIB_PATH_TYPE_BIER_TABLE;
1350 path->bier_table.fp_bier_tbl = rpath->frp_bier_tbl;
1352 else if (rpath->frp_flags & FIB_ROUTE_PATH_DEAG)
1354 path->fp_type = FIB_PATH_TYPE_DEAG;
1355 path->deag.fp_tbl_id = rpath->frp_fib_index;
1357 else if (rpath->frp_flags & FIB_ROUTE_PATH_DVR)
1359 path->fp_type = FIB_PATH_TYPE_DVR;
1360 path->dvr.fp_interface = rpath->frp_sw_if_index;
1362 else if (rpath->frp_flags & FIB_ROUTE_PATH_EXCLUSIVE)
1364 path->fp_type = FIB_PATH_TYPE_EXCLUSIVE;
1365 dpo_copy(&path->exclusive.fp_ex_dpo, &rpath->dpo);
1367 else if ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_PROHIBIT) ||
1368 (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_UNREACH) ||
1369 (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DROP))
1371 path->fp_type = FIB_PATH_TYPE_SPECIAL;
1373 else if ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_CLASSIFY))
1375 path->fp_type = FIB_PATH_TYPE_SPECIAL;
1376 path->classify.fp_classify_table_id = rpath->frp_classify_table_id;
1378 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_GLEAN)
1380 path->fp_type = FIB_PATH_TYPE_ATTACHED;
1381 path->attached.fp_interface = rpath->frp_sw_if_index;
1382 path->attached.fp_connected = rpath->frp_connected;
1384 else if (~0 != rpath->frp_sw_if_index)
1386 if (ip46_address_is_zero(&rpath->frp_addr))
1388 path->fp_type = FIB_PATH_TYPE_ATTACHED;
1389 path->attached.fp_interface = rpath->frp_sw_if_index;
1393 path->fp_type = FIB_PATH_TYPE_ATTACHED_NEXT_HOP;
1394 path->attached_next_hop.fp_interface = rpath->frp_sw_if_index;
1395 path->attached_next_hop.fp_nh = rpath->frp_addr;
1400 if (ip46_address_is_zero(&rpath->frp_addr))
1402 if (~0 == rpath->frp_fib_index)
1404 path->fp_type = FIB_PATH_TYPE_SPECIAL;
1408 path->fp_type = FIB_PATH_TYPE_DEAG;
1409 path->deag.fp_tbl_id = rpath->frp_fib_index;
1410 path->deag.fp_rpf_id = ~0;
1415 path->fp_type = FIB_PATH_TYPE_RECURSIVE;
1416 if (DPO_PROTO_MPLS == path->fp_nh_proto)
1418 path->recursive.fp_nh.fp_local_label = rpath->frp_local_label;
1419 path->recursive.fp_nh.fp_eos = rpath->frp_eos;
1423 path->recursive.fp_nh.fp_ip = rpath->frp_addr;
1425 path->recursive.fp_tbl_id = rpath->frp_fib_index;
1429 FIB_PATH_DBG(path, "create");
1431 return (fib_path_get_index(path));
1435 * fib_path_create_special
1437 * Create and initialise a new path object.
1438 * return the index of the path.
1441 fib_path_create_special (fib_node_index_t pl_index,
1442 dpo_proto_t nh_proto,
1443 fib_path_cfg_flags_t flags,
1444 const dpo_id_t *dpo)
1448 pool_get(fib_path_pool, path);
1449 clib_memset(path, 0, sizeof(*path));
1451 fib_node_init(&path->fp_node,
1452 FIB_NODE_TYPE_PATH);
1453 dpo_reset(&path->fp_dpo);
1455 path->fp_pl_index = pl_index;
1456 path->fp_weight = 1;
1457 path->fp_preference = 0;
1458 path->fp_nh_proto = nh_proto;
1459 path->fp_via_fib = FIB_NODE_INDEX_INVALID;
1460 path->fp_cfg_flags = flags;
1462 if (FIB_PATH_CFG_FLAG_DROP & flags)
1464 path->fp_type = FIB_PATH_TYPE_SPECIAL;
1466 else if (FIB_PATH_CFG_FLAG_LOCAL & flags)
1468 path->fp_type = FIB_PATH_TYPE_RECEIVE;
1469 path->attached.fp_interface = FIB_NODE_INDEX_INVALID;
1473 path->fp_type = FIB_PATH_TYPE_EXCLUSIVE;
1474 ASSERT(NULL != dpo);
1475 dpo_copy(&path->exclusive.fp_ex_dpo, dpo);
1478 return (fib_path_get_index(path));
1484 * Copy a path. return index of new path.
1487 fib_path_copy (fib_node_index_t path_index,
1488 fib_node_index_t path_list_index)
1490 fib_path_t *path, *orig_path;
1492 pool_get(fib_path_pool, path);
1494 orig_path = fib_path_get(path_index);
1495 ASSERT(NULL != orig_path);
1497 clib_memcpy(path, orig_path, sizeof(*path));
1499 FIB_PATH_DBG(path, "create-copy:%d", path_index);
1502 * reset the dynamic section
1504 fib_node_init(&path->fp_node, FIB_NODE_TYPE_PATH);
1505 path->fp_oper_flags = FIB_PATH_OPER_FLAG_NONE;
1506 path->fp_pl_index = path_list_index;
1507 path->fp_via_fib = FIB_NODE_INDEX_INVALID;
1508 clib_memset(&path->fp_dpo, 0, sizeof(path->fp_dpo));
1509 dpo_reset(&path->fp_dpo);
1511 if (path->fp_type == FIB_PATH_TYPE_EXCLUSIVE)
1513 clib_memset(&path->exclusive.fp_ex_dpo, 0, sizeof(dpo_id_t));
1514 dpo_copy(&path->exclusive.fp_ex_dpo, &orig_path->exclusive.fp_ex_dpo);
1517 return (fib_path_get_index(path));
1523 * destroy a path that is no longer required
1526 fib_path_destroy (fib_node_index_t path_index)
1530 path = fib_path_get(path_index);
1532 ASSERT(NULL != path);
1533 FIB_PATH_DBG(path, "destroy");
1535 fib_path_unresolve(path);
1537 fib_node_deinit(&path->fp_node);
1538 pool_put(fib_path_pool, path);
1544 * destroy a path that is no longer required
1547 fib_path_hash (fib_node_index_t path_index)
1551 path = fib_path_get(path_index);
1553 return (hash_memory(STRUCT_MARK_PTR(path, path_hash_start),
1554 (STRUCT_OFFSET_OF(fib_path_t, path_hash_end) -
1555 STRUCT_OFFSET_OF(fib_path_t, path_hash_start)),
1562 * Compare two paths for equivalence.
1565 fib_path_cmp_i (const fib_path_t *path1,
1566 const fib_path_t *path2)
1573 * paths of different types and protocol are not equal.
1574 * different weights and/or preference only are the same path.
1576 if (path1->fp_type != path2->fp_type)
1578 res = (path1->fp_type - path2->fp_type);
1580 else if (path1->fp_nh_proto != path2->fp_nh_proto)
1582 res = (path1->fp_nh_proto - path2->fp_nh_proto);
1587 * both paths are of the same type.
1588 * consider each type and its attributes in turn.
1590 switch (path1->fp_type)
1592 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
1593 res = ip46_address_cmp(&path1->attached_next_hop.fp_nh,
1594 &path2->attached_next_hop.fp_nh);
1596 res = (path1->attached_next_hop.fp_interface -
1597 path2->attached_next_hop.fp_interface);
1600 case FIB_PATH_TYPE_ATTACHED:
1601 res = (path1->attached.fp_interface -
1602 path2->attached.fp_interface);
1604 case FIB_PATH_TYPE_RECURSIVE:
1605 res = ip46_address_cmp(&path1->recursive.fp_nh.fp_ip,
1606 &path2->recursive.fp_nh.fp_ip);
1610 res = (path1->recursive.fp_tbl_id - path2->recursive.fp_tbl_id);
1613 case FIB_PATH_TYPE_BIER_FMASK:
1614 res = (path1->bier_fmask.fp_bier_fmask -
1615 path2->bier_fmask.fp_bier_fmask);
1617 case FIB_PATH_TYPE_BIER_IMP:
1618 res = (path1->bier_imp.fp_bier_imp -
1619 path2->bier_imp.fp_bier_imp);
1621 case FIB_PATH_TYPE_BIER_TABLE:
1622 res = bier_table_id_cmp(&path1->bier_table.fp_bier_tbl,
1623 &path2->bier_table.fp_bier_tbl);
1625 case FIB_PATH_TYPE_DEAG:
1626 res = (path1->deag.fp_tbl_id - path2->deag.fp_tbl_id);
1629 res = (path1->deag.fp_rpf_id - path2->deag.fp_rpf_id);
1632 case FIB_PATH_TYPE_INTF_RX:
1633 res = (path1->intf_rx.fp_interface - path2->intf_rx.fp_interface);
1635 case FIB_PATH_TYPE_UDP_ENCAP:
1636 res = (path1->udp_encap.fp_udp_encap_id - path2->udp_encap.fp_udp_encap_id);
1638 case FIB_PATH_TYPE_DVR:
1639 res = (path1->dvr.fp_interface - path2->dvr.fp_interface);
1641 case FIB_PATH_TYPE_EXCLUSIVE:
1642 res = dpo_cmp(&path1->exclusive.fp_ex_dpo, &path2->exclusive.fp_ex_dpo);
1644 case FIB_PATH_TYPE_SPECIAL:
1645 case FIB_PATH_TYPE_RECEIVE:
1654 * fib_path_cmp_for_sort
1656 * Compare two paths for equivalence. Used during path sorting.
1657 * As usual 0 means equal.
1660 fib_path_cmp_for_sort (void * v1,
1663 fib_node_index_t *pi1 = v1, *pi2 = v2;
1664 fib_path_t *path1, *path2;
1666 path1 = fib_path_get(*pi1);
1667 path2 = fib_path_get(*pi2);
1670 * when sorting paths we want the highest preference paths
1671 * first, so that the choices set built is in prefernce order
1673 if (path1->fp_preference != path2->fp_preference)
1675 return (path1->fp_preference - path2->fp_preference);
1678 return (fib_path_cmp_i(path1, path2));
1684 * Compare two paths for equivalence.
1687 fib_path_cmp (fib_node_index_t pi1,
1688 fib_node_index_t pi2)
1690 fib_path_t *path1, *path2;
1692 path1 = fib_path_get(pi1);
1693 path2 = fib_path_get(pi2);
1695 return (fib_path_cmp_i(path1, path2));
1699 fib_path_cmp_w_route_path (fib_node_index_t path_index,
1700 const fib_route_path_t *rpath)
1705 path = fib_path_get(path_index);
1709 if (path->fp_weight != rpath->frp_weight)
1711 res = (path->fp_weight - rpath->frp_weight);
1716 * both paths are of the same type.
1717 * consider each type and its attributes in turn.
1719 switch (path->fp_type)
1721 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
1722 res = ip46_address_cmp(&path->attached_next_hop.fp_nh,
1726 res = (path->attached_next_hop.fp_interface -
1727 rpath->frp_sw_if_index);
1730 case FIB_PATH_TYPE_ATTACHED:
1731 res = (path->attached.fp_interface - rpath->frp_sw_if_index);
1733 case FIB_PATH_TYPE_RECURSIVE:
1734 if (DPO_PROTO_MPLS == path->fp_nh_proto)
1736 res = path->recursive.fp_nh.fp_local_label - rpath->frp_local_label;
1740 res = path->recursive.fp_nh.fp_eos - rpath->frp_eos;
1745 res = ip46_address_cmp(&path->recursive.fp_nh.fp_ip,
1751 res = (path->recursive.fp_tbl_id - rpath->frp_fib_index);
1754 case FIB_PATH_TYPE_BIER_FMASK:
1755 res = (path->bier_fmask.fp_bier_fmask - rpath->frp_bier_fmask);
1757 case FIB_PATH_TYPE_BIER_IMP:
1758 res = (path->bier_imp.fp_bier_imp - rpath->frp_bier_imp);
1760 case FIB_PATH_TYPE_BIER_TABLE:
1761 res = bier_table_id_cmp(&path->bier_table.fp_bier_tbl,
1762 &rpath->frp_bier_tbl);
1764 case FIB_PATH_TYPE_INTF_RX:
1765 res = (path->intf_rx.fp_interface - rpath->frp_sw_if_index);
1767 case FIB_PATH_TYPE_UDP_ENCAP:
1768 res = (path->udp_encap.fp_udp_encap_id - rpath->frp_udp_encap_id);
1770 case FIB_PATH_TYPE_DEAG:
1771 res = (path->deag.fp_tbl_id - rpath->frp_fib_index);
1774 res = (path->deag.fp_rpf_id - rpath->frp_rpf_id);
1777 case FIB_PATH_TYPE_DVR:
1778 res = (path->dvr.fp_interface - rpath->frp_sw_if_index);
1780 case FIB_PATH_TYPE_EXCLUSIVE:
1781 res = dpo_cmp(&path->exclusive.fp_ex_dpo, &rpath->dpo);
1783 case FIB_PATH_TYPE_RECEIVE:
1784 if (rpath->frp_flags & FIB_ROUTE_PATH_LOCAL)
1793 case FIB_PATH_TYPE_SPECIAL:
1802 * fib_path_recursive_loop_detect
1804 * A forward walk of the FIB object graph to detect for a cycle/loop. This
1805 * walk is initiated when an entry is linking to a new path list or from an old.
1806 * The entry vector passed contains all the FIB entrys that are children of this
1807 * path (it is all the entries encountered on the walk so far). If this vector
1808 * contains the entry this path resolve via, then a loop is about to form.
1809 * The loop must be allowed to form, since we need the dependencies in place
1810 * so that we can track when the loop breaks.
1811 * However, we MUST not produce a loop in the forwarding graph (else packets
1812 * would loop around the switch path until the loop breaks), so we mark recursive
1813 * paths as looped so that they do not contribute forwarding information.
1814 * By marking the path as looped, an etry such as;
1816 * via a.a.a.a (looped)
1817 * via b.b.b.b (not looped)
1818 * can still forward using the info provided by b.b.b.b only
1821 fib_path_recursive_loop_detect (fib_node_index_t path_index,
1822 fib_node_index_t **entry_indicies)
1826 path = fib_path_get(path_index);
1829 * the forced drop path is never looped, cos it is never resolved.
1831 if (fib_path_is_permanent_drop(path))
1836 switch (path->fp_type)
1838 case FIB_PATH_TYPE_RECURSIVE:
1840 fib_node_index_t *entry_index, *entries;
1842 entries = *entry_indicies;
1844 vec_foreach(entry_index, entries) {
1845 if (*entry_index == path->fp_via_fib)
1848 * the entry that is about to link to this path-list (or
1849 * one of this path-list's children) is the same entry that
1850 * this recursive path resolves through. this is a cycle.
1860 FIB_PATH_DBG(path, "recursive loop formed");
1861 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
1863 dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
1868 * no loop here yet. keep forward walking the graph.
1870 if (fib_entry_recursive_loop_detect(path->fp_via_fib, entry_indicies))
1872 FIB_PATH_DBG(path, "recursive loop formed");
1873 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
1877 FIB_PATH_DBG(path, "recursive loop cleared");
1878 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
1883 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
1884 case FIB_PATH_TYPE_ATTACHED:
1885 if (dpo_is_adj(&path->fp_dpo) &&
1886 adj_recursive_loop_detect(path->fp_dpo.dpoi_index,
1889 FIB_PATH_DBG(path, "recursive loop formed");
1890 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
1894 FIB_PATH_DBG(path, "recursive loop cleared");
1895 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
1898 case FIB_PATH_TYPE_SPECIAL:
1899 case FIB_PATH_TYPE_DEAG:
1900 case FIB_PATH_TYPE_DVR:
1901 case FIB_PATH_TYPE_RECEIVE:
1902 case FIB_PATH_TYPE_INTF_RX:
1903 case FIB_PATH_TYPE_UDP_ENCAP:
1904 case FIB_PATH_TYPE_EXCLUSIVE:
1905 case FIB_PATH_TYPE_BIER_FMASK:
1906 case FIB_PATH_TYPE_BIER_TABLE:
1907 case FIB_PATH_TYPE_BIER_IMP:
1909 * these path types cannot be part of a loop, since they are the leaves
1915 return (fib_path_is_looped(path_index));
1919 fib_path_resolve (fib_node_index_t path_index)
1923 path = fib_path_get(path_index);
1926 * hope for the best.
1928 path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
1931 * the forced drop path resolves via the drop adj
1933 if (fib_path_is_permanent_drop(path))
1935 dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
1936 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1937 return (fib_path_is_resolved(path_index));
1940 switch (path->fp_type)
1942 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
1943 fib_path_attached_next_hop_set(path);
1945 case FIB_PATH_TYPE_ATTACHED:
1947 dpo_id_t tmp = DPO_INVALID;
1950 * path->attached.fp_interface
1952 if (!vnet_sw_interface_is_up(vnet_get_main(),
1953 path->attached.fp_interface))
1955 path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
1957 fib_path_attached_get_adj(path,
1958 dpo_proto_to_link(path->fp_nh_proto),
1962 * re-fetch after possible mem realloc
1964 path = fib_path_get(path_index);
1965 dpo_copy(&path->fp_dpo, &tmp);
1968 * become a child of the adjacency so we receive updates
1969 * when the interface state changes
1971 if (dpo_is_adj(&path->fp_dpo))
1973 path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index,
1975 fib_path_get_index(path));
1980 case FIB_PATH_TYPE_RECURSIVE:
1983 * Create a RR source entry in the table for the address
1984 * that this path recurses through.
1985 * This resolve action is recursive, hence we may create
1986 * more paths in the process. more creates mean maybe realloc
1989 fib_node_index_t fei;
1992 ASSERT(FIB_NODE_INDEX_INVALID == path->fp_via_fib);
1994 if (DPO_PROTO_MPLS == path->fp_nh_proto)
1996 fib_prefix_from_mpls_label(path->recursive.fp_nh.fp_local_label,
1997 path->recursive.fp_nh.fp_eos,
2002 ASSERT(!ip46_address_is_zero(&path->recursive.fp_nh.fp_ip));
2004 fib_protocol_t fp = (ip46_address_is_ip4(&path->recursive.fp_nh.fp_ip) ?
2005 FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
2006 fib_prefix_from_ip46_addr(fp, &path->recursive.fp_nh.fp_ip, &pfx);
2009 fib_table_lock(path->recursive.fp_tbl_id,
2010 dpo_proto_to_fib(path->fp_nh_proto),
2012 fei = fib_table_entry_special_add(path->recursive.fp_tbl_id,
2015 FIB_ENTRY_FLAG_NONE);
2017 path = fib_path_get(path_index);
2018 path->fp_via_fib = fei;
2021 * become a dependent child of the entry so the path is
2022 * informed when the forwarding for the entry changes.
2024 path->fp_sibling = fib_entry_child_add(path->fp_via_fib,
2026 fib_path_get_index(path));
2029 * create and configure the IP DPO
2031 fib_path_recursive_adj_update(
2033 fib_path_to_chain_type(path),
2038 case FIB_PATH_TYPE_BIER_FMASK:
2041 * become a dependent child of the entry so the path is
2042 * informed when the forwarding for the entry changes.
2044 path->fp_sibling = bier_fmask_child_add(path->bier_fmask.fp_bier_fmask,
2046 fib_path_get_index(path));
2048 path->fp_via_bier_fmask = path->bier_fmask.fp_bier_fmask;
2049 fib_path_bier_fmask_update(path, &path->fp_dpo);
2053 case FIB_PATH_TYPE_BIER_IMP:
2054 bier_imp_lock(path->bier_imp.fp_bier_imp);
2055 bier_imp_contribute_forwarding(path->bier_imp.fp_bier_imp,
2059 case FIB_PATH_TYPE_BIER_TABLE:
2062 * Find/create the BIER table to link to
2064 ASSERT(FIB_NODE_INDEX_INVALID == path->fp_via_bier_tbl);
2066 path->fp_via_bier_tbl =
2067 bier_table_ecmp_create_and_lock(&path->bier_table.fp_bier_tbl);
2069 bier_table_contribute_forwarding(path->fp_via_bier_tbl,
2073 case FIB_PATH_TYPE_SPECIAL:
2074 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_PROHIBIT)
2076 ip_null_dpo_add_and_lock (path->fp_nh_proto,
2077 IP_NULL_ACTION_SEND_ICMP_PROHIBIT,
2080 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_UNREACH)
2082 ip_null_dpo_add_and_lock (path->fp_nh_proto,
2083 IP_NULL_ACTION_SEND_ICMP_UNREACH,
2086 else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_CLASSIFY)
2088 dpo_set (&path->fp_dpo, DPO_CLASSIFY,
2090 classify_dpo_create (path->fp_nh_proto,
2091 path->classify.fp_classify_table_id));
2096 * Resolve via the drop
2098 dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
2101 case FIB_PATH_TYPE_DEAG:
2103 if (DPO_PROTO_BIER == path->fp_nh_proto)
2105 bier_disp_table_contribute_forwarding(path->deag.fp_tbl_id,
2111 * Resolve via a lookup DPO.
2112 * FIXME. control plane should add routes with a table ID
2114 lookup_input_t input;
2117 cast = (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID ?
2120 input = (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DEAG_SRC ?
2121 LOOKUP_INPUT_SRC_ADDR :
2122 LOOKUP_INPUT_DST_ADDR);
2124 lookup_dpo_add_or_lock_w_fib_index(path->deag.fp_tbl_id,
2128 LOOKUP_TABLE_FROM_CONFIG,
2133 case FIB_PATH_TYPE_DVR:
2134 dvr_dpo_add_or_lock(path->dvr.fp_interface,
2138 case FIB_PATH_TYPE_RECEIVE:
2140 * Resolve via a receive DPO.
2142 receive_dpo_add_or_lock(path->fp_nh_proto,
2143 path->receive.fp_interface,
2144 &path->receive.fp_addr,
2147 case FIB_PATH_TYPE_UDP_ENCAP:
2148 udp_encap_lock(path->udp_encap.fp_udp_encap_id);
2149 udp_encap_contribute_forwarding(path->udp_encap.fp_udp_encap_id,
2153 case FIB_PATH_TYPE_INTF_RX: {
2155 * Resolve via a receive DPO.
2157 interface_rx_dpo_add_or_lock(path->fp_nh_proto,
2158 path->intf_rx.fp_interface,
2162 case FIB_PATH_TYPE_EXCLUSIVE:
2164 * Resolve via the user provided DPO
2166 dpo_copy(&path->fp_dpo, &path->exclusive.fp_ex_dpo);
2170 return (fib_path_is_resolved(path_index));
2174 fib_path_get_resolving_interface (fib_node_index_t path_index)
2178 path = fib_path_get(path_index);
2180 switch (path->fp_type)
2182 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2183 return (path->attached_next_hop.fp_interface);
2184 case FIB_PATH_TYPE_ATTACHED:
2185 return (path->attached.fp_interface);
2186 case FIB_PATH_TYPE_RECEIVE:
2187 return (path->receive.fp_interface);
2188 case FIB_PATH_TYPE_RECURSIVE:
2189 if (fib_path_is_resolved(path_index))
2191 return (fib_entry_get_resolving_interface(path->fp_via_fib));
2194 case FIB_PATH_TYPE_DVR:
2195 return (path->dvr.fp_interface);
2196 case FIB_PATH_TYPE_INTF_RX:
2197 case FIB_PATH_TYPE_UDP_ENCAP:
2198 case FIB_PATH_TYPE_SPECIAL:
2199 case FIB_PATH_TYPE_DEAG:
2200 case FIB_PATH_TYPE_EXCLUSIVE:
2201 case FIB_PATH_TYPE_BIER_FMASK:
2202 case FIB_PATH_TYPE_BIER_TABLE:
2203 case FIB_PATH_TYPE_BIER_IMP:
2206 return (dpo_get_urpf(&path->fp_dpo));
2210 fib_path_get_resolving_index (fib_node_index_t path_index)
2214 path = fib_path_get(path_index);
2216 switch (path->fp_type)
2218 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2219 case FIB_PATH_TYPE_ATTACHED:
2220 case FIB_PATH_TYPE_RECEIVE:
2221 case FIB_PATH_TYPE_INTF_RX:
2222 case FIB_PATH_TYPE_SPECIAL:
2223 case FIB_PATH_TYPE_DEAG:
2224 case FIB_PATH_TYPE_DVR:
2225 case FIB_PATH_TYPE_EXCLUSIVE:
2227 case FIB_PATH_TYPE_UDP_ENCAP:
2228 return (path->udp_encap.fp_udp_encap_id);
2229 case FIB_PATH_TYPE_RECURSIVE:
2230 return (path->fp_via_fib);
2231 case FIB_PATH_TYPE_BIER_FMASK:
2232 return (path->bier_fmask.fp_bier_fmask);
2233 case FIB_PATH_TYPE_BIER_TABLE:
2234 return (path->fp_via_bier_tbl);
2235 case FIB_PATH_TYPE_BIER_IMP:
2236 return (path->bier_imp.fp_bier_imp);
2242 fib_path_get_adj (fib_node_index_t path_index)
2246 path = fib_path_get(path_index);
2248 if (dpo_is_adj(&path->fp_dpo))
2250 return (path->fp_dpo.dpoi_index);
2252 return (ADJ_INDEX_INVALID);
2256 fib_path_get_weight (fib_node_index_t path_index)
2260 path = fib_path_get(path_index);
2264 return (path->fp_weight);
2268 fib_path_get_preference (fib_node_index_t path_index)
2272 path = fib_path_get(path_index);
2276 return (path->fp_preference);
2280 fib_path_get_rpf_id (fib_node_index_t path_index)
2284 path = fib_path_get(path_index);
2288 if (FIB_PATH_CFG_FLAG_RPF_ID & path->fp_cfg_flags)
2290 return (path->deag.fp_rpf_id);
2297 * @brief Contribute the path's adjacency to the list passed.
2298 * By calling this function over all paths, recursively, a child
2299 * can construct its full set of forwarding adjacencies, and hence its
2303 fib_path_contribute_urpf (fib_node_index_t path_index,
2308 path = fib_path_get(path_index);
2311 * resolved and unresolved paths contribute to the RPF list.
2313 switch (path->fp_type)
2315 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2316 fib_urpf_list_append(urpf, path->attached_next_hop.fp_interface);
2319 case FIB_PATH_TYPE_ATTACHED:
2320 fib_urpf_list_append(urpf, path->attached.fp_interface);
2323 case FIB_PATH_TYPE_RECURSIVE:
2324 if (FIB_NODE_INDEX_INVALID != path->fp_via_fib &&
2325 !fib_path_is_looped(path_index))
2328 * there's unresolved due to constraints, and there's unresolved
2329 * due to ain't got no via. can't do nowt w'out via.
2331 fib_entry_contribute_urpf(path->fp_via_fib, urpf);
2335 case FIB_PATH_TYPE_EXCLUSIVE:
2336 case FIB_PATH_TYPE_SPECIAL:
2339 * these path types may link to an adj, if that's what
2342 u32 rpf_sw_if_index;
2344 rpf_sw_if_index = dpo_get_urpf(&path->fp_dpo);
2346 if (~0 != rpf_sw_if_index)
2348 fib_urpf_list_append(urpf, rpf_sw_if_index);
2352 case FIB_PATH_TYPE_DVR:
2353 fib_urpf_list_append(urpf, path->dvr.fp_interface);
2355 case FIB_PATH_TYPE_UDP_ENCAP:
2356 fib_urpf_list_append(urpf, path->udp_encap.fp_udp_encap_id);
2358 case FIB_PATH_TYPE_DEAG:
2359 case FIB_PATH_TYPE_RECEIVE:
2360 case FIB_PATH_TYPE_INTF_RX:
2361 case FIB_PATH_TYPE_BIER_FMASK:
2362 case FIB_PATH_TYPE_BIER_TABLE:
2363 case FIB_PATH_TYPE_BIER_IMP:
2365 * these path types don't link to an adj
2372 fib_path_stack_mpls_disp (fib_node_index_t path_index,
2373 dpo_proto_t payload_proto,
2374 fib_mpls_lsp_mode_t mode,
2379 path = fib_path_get(path_index);
2383 switch (path->fp_type)
2385 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2387 dpo_id_t tmp = DPO_INVALID;
2389 dpo_copy(&tmp, dpo);
2391 mpls_disp_dpo_create(payload_proto, ~0, mode, &tmp, dpo);
2395 case FIB_PATH_TYPE_DEAG:
2397 dpo_id_t tmp = DPO_INVALID;
2399 dpo_copy(&tmp, dpo);
2401 mpls_disp_dpo_create(payload_proto,
2402 path->deag.fp_rpf_id,
2407 case FIB_PATH_TYPE_RECEIVE:
2408 case FIB_PATH_TYPE_ATTACHED:
2409 case FIB_PATH_TYPE_RECURSIVE:
2410 case FIB_PATH_TYPE_INTF_RX:
2411 case FIB_PATH_TYPE_UDP_ENCAP:
2412 case FIB_PATH_TYPE_EXCLUSIVE:
2413 case FIB_PATH_TYPE_SPECIAL:
2414 case FIB_PATH_TYPE_BIER_FMASK:
2415 case FIB_PATH_TYPE_BIER_TABLE:
2416 case FIB_PATH_TYPE_BIER_IMP:
2417 case FIB_PATH_TYPE_DVR:
2421 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_POP_PW_CW)
2423 dpo_id_t tmp = DPO_INVALID;
2425 dpo_copy(&tmp, dpo);
2427 pw_cw_dpo_create(&tmp, dpo);
2433 fib_path_contribute_forwarding (fib_node_index_t path_index,
2434 fib_forward_chain_type_t fct,
2435 dpo_proto_t payload_proto,
2440 path = fib_path_get(path_index);
2445 * The DPO stored in the path was created when the path was resolved.
2446 * This then represents the path's 'native' protocol; IP.
2447 * For all others will need to go find something else.
2449 if (fib_path_to_chain_type(path) == fct)
2451 dpo_copy(dpo, &path->fp_dpo);
2455 switch (path->fp_type)
2457 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2460 case FIB_FORW_CHAIN_TYPE_MPLS_EOS: {
2461 dpo_id_t tmp = DPO_INVALID;
2462 dpo_copy (&tmp, dpo);
2463 path = fib_path_attached_next_hop_get_adj(
2465 dpo_proto_to_link(payload_proto),
2467 dpo_copy (dpo, &tmp);
2471 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2472 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2473 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2474 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2475 case FIB_FORW_CHAIN_TYPE_NSH:
2476 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2477 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2479 dpo_id_t tmp = DPO_INVALID;
2480 dpo_copy (&tmp, dpo);
2481 path = fib_path_attached_next_hop_get_adj(
2483 fib_forw_chain_type_to_link_type(fct),
2485 dpo_copy (dpo, &tmp);
2489 case FIB_FORW_CHAIN_TYPE_BIER:
2493 case FIB_PATH_TYPE_RECURSIVE:
2496 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
2497 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2498 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2499 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2500 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2501 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2502 case FIB_FORW_CHAIN_TYPE_BIER:
2503 fib_path_recursive_adj_update(path, fct, dpo);
2505 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2506 case FIB_FORW_CHAIN_TYPE_NSH:
2511 case FIB_PATH_TYPE_BIER_TABLE:
2514 case FIB_FORW_CHAIN_TYPE_BIER:
2515 bier_table_contribute_forwarding(path->fp_via_bier_tbl, dpo);
2517 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
2518 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2519 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2520 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2521 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2522 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2523 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2524 case FIB_FORW_CHAIN_TYPE_NSH:
2529 case FIB_PATH_TYPE_BIER_FMASK:
2532 case FIB_FORW_CHAIN_TYPE_BIER:
2533 fib_path_bier_fmask_update(path, dpo);
2535 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
2536 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2537 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2538 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2539 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2540 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2541 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2542 case FIB_FORW_CHAIN_TYPE_NSH:
2547 case FIB_PATH_TYPE_BIER_IMP:
2548 bier_imp_contribute_forwarding(path->bier_imp.fp_bier_imp,
2549 fib_forw_chain_type_to_dpo_proto(fct),
2552 case FIB_PATH_TYPE_DEAG:
2555 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2556 lookup_dpo_add_or_lock_w_table_id(MPLS_FIB_DEFAULT_TABLE_ID,
2559 LOOKUP_INPUT_DST_ADDR,
2560 LOOKUP_TABLE_FROM_CONFIG,
2563 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
2564 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2565 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2566 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2567 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2568 dpo_copy(dpo, &path->fp_dpo);
2570 case FIB_FORW_CHAIN_TYPE_BIER:
2572 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2573 case FIB_FORW_CHAIN_TYPE_NSH:
2578 case FIB_PATH_TYPE_EXCLUSIVE:
2579 dpo_copy(dpo, &path->exclusive.fp_ex_dpo);
2581 case FIB_PATH_TYPE_ATTACHED:
2584 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
2586 * End of stack traffic via an attacehd path (a glean)
2587 * must forace an IP lookup so that the IP packet can
2588 * match against any installed adj-fibs
2590 lookup_dpo_add_or_lock_w_fib_index(
2591 fib_table_get_index_for_sw_if_index(
2592 dpo_proto_to_fib(payload_proto),
2593 path->attached.fp_interface),
2596 LOOKUP_INPUT_DST_ADDR,
2597 LOOKUP_TABLE_FROM_CONFIG,
2600 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
2601 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
2602 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
2603 case FIB_FORW_CHAIN_TYPE_ETHERNET:
2604 case FIB_FORW_CHAIN_TYPE_NSH:
2605 case FIB_FORW_CHAIN_TYPE_BIER:
2606 fib_path_attached_get_adj(path,
2607 fib_forw_chain_type_to_link_type(fct),
2610 case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
2611 case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
2616 * Create the adj needed for sending IP multicast traffic
2618 if (vnet_sw_interface_is_p2p(vnet_get_main(),
2619 path->attached.fp_interface))
2622 * point-2-point interfaces do not require a glean, since
2623 * there is nothing to ARP. Install a rewrite/nbr adj instead
2625 ai = adj_nbr_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
2626 fib_forw_chain_type_to_link_type(fct),
2628 path->attached.fp_interface);
2632 ai = adj_mcast_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
2633 fib_forw_chain_type_to_link_type(fct),
2634 path->attached.fp_interface);
2636 dpo_set(dpo, DPO_ADJACENCY,
2637 fib_forw_chain_type_to_dpo_proto(fct),
2644 case FIB_PATH_TYPE_INTF_RX:
2646 * Create the adj needed for sending IP multicast traffic
2648 interface_rx_dpo_add_or_lock(payload_proto,
2649 path->intf_rx.fp_interface,
2652 case FIB_PATH_TYPE_UDP_ENCAP:
2653 udp_encap_contribute_forwarding(path->udp_encap.fp_udp_encap_id,
2657 case FIB_PATH_TYPE_RECEIVE:
2658 case FIB_PATH_TYPE_SPECIAL:
2659 case FIB_PATH_TYPE_DVR:
2660 dpo_copy(dpo, &path->fp_dpo);
2666 load_balance_path_t *
2667 fib_path_append_nh_for_multipath_hash (fib_node_index_t path_index,
2668 fib_forward_chain_type_t fct,
2669 dpo_proto_t payload_proto,
2670 load_balance_path_t *hash_key)
2672 load_balance_path_t *mnh;
2675 path = fib_path_get(path_index);
2679 vec_add2(hash_key, mnh, 1);
2681 mnh->path_weight = path->fp_weight;
2682 mnh->path_index = path_index;
2684 if (fib_path_is_resolved(path_index))
2686 fib_path_contribute_forwarding(path_index, fct, payload_proto, &mnh->path_dpo);
2690 dpo_copy(&mnh->path_dpo,
2691 drop_dpo_get(fib_forw_chain_type_to_dpo_proto(fct)));
2697 fib_path_is_recursive_constrained (fib_node_index_t path_index)
2701 path = fib_path_get(path_index);
2703 return ((FIB_PATH_TYPE_RECURSIVE == path->fp_type) &&
2704 ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED) ||
2705 (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST)));
2709 fib_path_is_exclusive (fib_node_index_t path_index)
2713 path = fib_path_get(path_index);
2715 return (FIB_PATH_TYPE_EXCLUSIVE == path->fp_type);
2719 fib_path_is_deag (fib_node_index_t path_index)
2723 path = fib_path_get(path_index);
2725 return (FIB_PATH_TYPE_DEAG == path->fp_type);
2729 fib_path_is_resolved (fib_node_index_t path_index)
2733 path = fib_path_get(path_index);
2735 return (dpo_id_is_valid(&path->fp_dpo) &&
2736 (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED) &&
2737 !fib_path_is_looped(path_index) &&
2738 !fib_path_is_permanent_drop(path));
2742 fib_path_is_looped (fib_node_index_t path_index)
2746 path = fib_path_get(path_index);
2748 return (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP);
2751 fib_path_list_walk_rc_t
2752 fib_path_encode (fib_node_index_t path_list_index,
2753 fib_node_index_t path_index,
2754 const fib_path_ext_t *path_ext,
2757 fib_path_encode_ctx_t *ctx = args;
2758 fib_route_path_t *rpath;
2761 path = fib_path_get(path_index);
2763 return (FIB_PATH_LIST_WALK_CONTINUE);
2765 vec_add2(ctx->rpaths, rpath, 1);
2766 rpath->frp_weight = path->fp_weight;
2767 rpath->frp_preference = path->fp_preference;
2768 rpath->frp_proto = path->fp_nh_proto;
2769 rpath->frp_sw_if_index = ~0;
2770 rpath->frp_fib_index = 0;
2772 switch (path->fp_type)
2774 case FIB_PATH_TYPE_RECEIVE:
2775 rpath->frp_addr = path->receive.fp_addr;
2776 rpath->frp_sw_if_index = path->receive.fp_interface;
2777 rpath->frp_flags |= FIB_ROUTE_PATH_LOCAL;
2779 case FIB_PATH_TYPE_ATTACHED:
2780 rpath->frp_sw_if_index = path->attached.fp_interface;
2782 case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
2783 rpath->frp_sw_if_index = path->attached_next_hop.fp_interface;
2784 rpath->frp_addr = path->attached_next_hop.fp_nh;
2786 case FIB_PATH_TYPE_BIER_FMASK:
2787 rpath->frp_bier_fmask = path->bier_fmask.fp_bier_fmask;
2789 case FIB_PATH_TYPE_SPECIAL:
2791 case FIB_PATH_TYPE_DEAG:
2792 rpath->frp_fib_index = path->deag.fp_tbl_id;
2793 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID)
2795 rpath->frp_flags |= FIB_ROUTE_PATH_RPF_ID;
2798 case FIB_PATH_TYPE_RECURSIVE:
2799 rpath->frp_addr = path->recursive.fp_nh.fp_ip;
2800 rpath->frp_fib_index = path->recursive.fp_tbl_id;
2802 case FIB_PATH_TYPE_DVR:
2803 rpath->frp_sw_if_index = path->dvr.fp_interface;
2804 rpath->frp_flags |= FIB_ROUTE_PATH_DVR;
2806 case FIB_PATH_TYPE_UDP_ENCAP:
2807 rpath->frp_udp_encap_id = path->udp_encap.fp_udp_encap_id;
2808 rpath->frp_flags |= FIB_ROUTE_PATH_UDP_ENCAP;
2810 case FIB_PATH_TYPE_INTF_RX:
2811 rpath->frp_sw_if_index = path->receive.fp_interface;
2812 rpath->frp_flags |= FIB_ROUTE_PATH_INTF_RX;
2814 case FIB_PATH_TYPE_EXCLUSIVE:
2815 rpath->frp_flags |= FIB_ROUTE_PATH_EXCLUSIVE;
2820 if (path_ext && path_ext->fpe_type == FIB_PATH_EXT_MPLS)
2822 rpath->frp_label_stack = path_ext->fpe_path.frp_label_stack;
2825 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DROP)
2826 rpath->frp_flags |= FIB_ROUTE_PATH_DROP;
2827 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_UNREACH)
2828 rpath->frp_flags |= FIB_ROUTE_PATH_ICMP_UNREACH;
2829 if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_ICMP_PROHIBIT)
2830 rpath->frp_flags |= FIB_ROUTE_PATH_ICMP_PROHIBIT;
2832 return (FIB_PATH_LIST_WALK_CONTINUE);
2836 fib_path_get_proto (fib_node_index_t path_index)
2840 path = fib_path_get(path_index);
2842 return (path->fp_nh_proto);
2846 fib_path_module_init (void)
2848 fib_node_register_type (FIB_NODE_TYPE_PATH, &fib_path_vft);
2849 fib_path_logger = vlib_log_register_class ("fib", "path");
2852 static clib_error_t *
2853 show_fib_path_command (vlib_main_t * vm,
2854 unformat_input_t * input,
2855 vlib_cli_command_t * cmd)
2857 fib_node_index_t pi;
2860 if (unformat (input, "%d", &pi))
2863 * show one in detail
2865 if (!pool_is_free_index(fib_path_pool, pi))
2867 path = fib_path_get(pi);
2868 u8 *s = format(NULL, "%U", format_fib_path, pi, 1,
2869 FIB_PATH_FORMAT_FLAGS_NONE);
2870 s = format(s, "\n children:");
2871 s = fib_node_children_format(path->fp_node.fn_children, s);
2872 vlib_cli_output (vm, "%v", s);
2877 vlib_cli_output (vm, "path %d invalid", pi);
2882 vlib_cli_output (vm, "FIB Paths");
2883 pool_foreach_index (pi, fib_path_pool)
2885 vlib_cli_output (vm, "%U", format_fib_path, pi, 0,
2886 FIB_PATH_FORMAT_FLAGS_NONE);
2893 VLIB_CLI_COMMAND (show_fib_path, static) = {
2894 .path = "show fib paths",
2895 .function = show_fib_path_command,
2896 .short_help = "show fib paths",