2 * mpls_tunnel.c: MPLS tunnel interfaces (i.e. for RSVP-TE)
4 * Copyright (c) 2012 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vnet/vnet.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/mpls/mpls_tunnel.h>
21 #include <vnet/mpls/mpls_types.h>
22 #include <vnet/ip/ip.h>
23 #include <vnet/fib/fib_path_list.h>
24 #include <vnet/adj/adj_midchain.h>
25 #include <vnet/adj/adj_mcast.h>
26 #include <vnet/dpo/replicate_dpo.h>
27 #include <vnet/fib/mpls_fib.h>
30 * @brief pool of tunnel instances
32 static mpls_tunnel_t *mpls_tunnel_pool;
35 * @brief DB of SW index to tunnel index
37 static u32 *mpls_tunnel_db;
40 * @brief MPLS tunnel flags strings
42 static const char *mpls_tunnel_attribute_names[] = MPLS_TUNNEL_ATTRIBUTES;
45 * @brief Get a tunnel object from a SW interface index
48 mpls_tunnel_get_from_sw_if_index (u32 sw_if_index)
50 if ((vec_len(mpls_tunnel_db) <= sw_if_index) ||
51 (~0 == mpls_tunnel_db[sw_if_index]))
54 return (pool_elt_at_index(mpls_tunnel_pool,
55 mpls_tunnel_db[sw_if_index]));
59 * @brief Build a rewrite string for the MPLS tunnel.
62 mpls_tunnel_build_rewrite_i (void)
65 * passing the adj code a NULL rewirte means 'i don't have one cos
66 * t'other end is unresolved'. That's not the case here. For the mpls
67 * tunnel there are just no bytes of encap to apply in the adj. We'll impose
68 * the label stack once we choose a path. So return a zero length rewrite.
72 vec_validate(rewrite, 0);
73 vec_reset_length(rewrite);
79 * @brief Build a rewrite string for the MPLS tunnel.
82 mpls_tunnel_build_rewrite (vnet_main_t * vnm,
84 vnet_link_t link_type,
85 const void *dst_address)
87 return (mpls_tunnel_build_rewrite_i());
90 typedef struct mpls_tunnel_collect_forwarding_ctx_t_
92 load_balance_path_t * next_hops;
93 const mpls_tunnel_t *mt;
94 fib_forward_chain_type_t fct;
95 } mpls_tunnel_collect_forwarding_ctx_t;
97 static fib_path_list_walk_rc_t
98 mpls_tunnel_collect_forwarding (fib_node_index_t pl_index,
99 fib_node_index_t path_index,
102 mpls_tunnel_collect_forwarding_ctx_t *ctx;
103 fib_path_ext_t *path_ext;
108 * if the path is not resolved, don't include it.
110 if (!fib_path_is_resolved(path_index))
112 return (FIB_PATH_LIST_WALK_CONTINUE);
116 * get the matching path-extension for the path being visited.
118 path_ext = fib_path_ext_list_find_by_path_index(&ctx->mt->mt_path_exts,
122 * we don't want IP TTL decrements for packets hitting the MPLS labels
123 * we stack on, since the IP TTL decrement is done by the adj
125 path_ext->fpe_mpls_flags |= FIB_PATH_EXT_MPLS_FLAG_NO_IP_TTL_DECR;
128 * found a matching extension. stack it to obtain the forwarding
129 * info for this path.
131 ctx->next_hops = fib_path_ext_stack(path_ext,
136 return (FIB_PATH_LIST_WALK_CONTINUE);
140 mpls_tunnel_mk_lb (mpls_tunnel_t *mt,
142 fib_forward_chain_type_t fct,
145 dpo_proto_t lb_proto;
148 * If the entry has path extensions then we construct a load-balance
149 * by stacking the extensions on the forwarding chains of the paths.
150 * Otherwise we use the load-balance of the path-list
152 mpls_tunnel_collect_forwarding_ctx_t ctx = {
159 * As an optimisation we allocate the vector of next-hops to be sized
160 * equal to the maximum nuber of paths we will need, which is also the
161 * most likely number we will need, since in most cases the paths are 'up'.
163 vec_validate(ctx.next_hops, fib_path_list_get_n_paths(mt->mt_path_list));
164 vec_reset_length(ctx.next_hops);
166 lb_proto = fib_forw_chain_type_to_dpo_proto(fct);
168 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
170 fib_path_list_walk(mt->mt_path_list,
171 mpls_tunnel_collect_forwarding,
175 if (!dpo_id_is_valid(dpo_lb))
180 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
185 replicate_create(0, lb_proto));
189 flow_hash_config_t fhc;
194 fhc = MPLS_FLOW_HASH_DEFAULT;
198 fhc = IP_FLOW_HASH_DEFAULT;
208 load_balance_create(0, lb_proto, fhc));
212 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
217 replicate_multipath_update(dpo_lb, ctx.next_hops);
221 load_balance_multipath_update(dpo_lb,
223 LOAD_BALANCE_FLAG_NONE);
224 vec_free(ctx.next_hops);
231 * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
234 mpls_tunnel_stack (adj_index_t ai)
241 sw_if_index = adj->rewrite_header.sw_if_index;
243 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
249 * while we're stacking the adj, remove the tunnel from the child list
250 * of the path list. this breaks a circular dependency of walk updates
251 * where the create of adjacencies in the children can lead to walks
252 * that get back here.
254 fib_path_list_lock(mt->mt_path_list);
256 fib_path_list_child_remove(mt->mt_path_list,
257 mt->mt_sibling_index);
260 * Construct the DPO (load-balance or replicate) that we can stack
261 * the tunnel's midchain on
263 if (vnet_hw_interface_get_flags(vnet_get_main(),
264 mt->mt_hw_if_index) &
265 VNET_HW_INTERFACE_FLAG_LINK_UP)
267 dpo_id_t dpo = DPO_INVALID;
269 mpls_tunnel_mk_lb(mt,
271 fib_forw_chain_type_from_link_type(
272 adj_get_link_type(ai)),
275 adj_nbr_midchain_stack(ai, &dpo);
280 adj_nbr_midchain_unstack(ai);
283 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
284 FIB_NODE_TYPE_MPLS_TUNNEL,
285 mt - mpls_tunnel_pool);
287 fib_path_list_unlock(mt->mt_path_list);
291 * @brief Call back when restacking all adjacencies on a MPLS interface
294 mpls_adj_walk_cb (adj_index_t ai,
297 mpls_tunnel_stack(ai);
299 return (ADJ_WALK_RC_CONTINUE);
303 mpls_tunnel_restack (mpls_tunnel_t *mt)
305 fib_protocol_t proto;
308 * walk all the adjacencies on the MPLS interface and restack them
310 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
313 * Stack a load-balance that drops, whilst we have no paths
315 vnet_hw_interface_t * hi;
316 dpo_id_t dpo = DPO_INVALID;
318 mpls_tunnel_mk_lb(mt,
320 FIB_FORW_CHAIN_TYPE_ETHERNET,
323 hi = vnet_get_hw_interface(vnet_get_main(), mt->mt_hw_if_index);
324 dpo_stack_from_node(hi->tx_node_index,
331 FOR_EACH_FIB_PROTOCOL(proto)
333 adj_nbr_walk(mt->mt_sw_if_index,
341 static clib_error_t *
342 mpls_tunnel_admin_up_down (vnet_main_t * vnm,
346 vnet_hw_interface_t * hi;
349 hi = vnet_get_hw_interface (vnm, hw_if_index);
351 mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
356 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
357 vnet_hw_interface_set_flags (vnm, hw_if_index,
358 VNET_HW_INTERFACE_FLAG_LINK_UP);
360 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
362 mpls_tunnel_restack(mt);
368 * @brief Fixup the adj rewrite post encap. This is a no-op since the
369 * rewrite is a stack of labels.
372 mpls_tunnel_fixup (vlib_main_t *vm,
378 * A no-op w.r.t. the header. but reset the 'have we pushed any
379 * MPLS labels onto the packet' flag. That way when we enter the
380 * tunnel we'll get a TTL set to 255
382 vnet_buffer(b0)->mpls.first = 0;
386 mpls_tunnel_update_adj (vnet_main_t * vnm,
392 ASSERT(ADJ_INDEX_INVALID != ai);
396 switch (adj->lookup_next_index)
398 case IP_LOOKUP_NEXT_ARP:
399 case IP_LOOKUP_NEXT_GLEAN:
400 case IP_LOOKUP_NEXT_BCAST:
401 adj_nbr_midchain_update_rewrite(ai, mpls_tunnel_fixup,
404 mpls_tunnel_build_rewrite_i());
406 case IP_LOOKUP_NEXT_MCAST:
408 * Construct a partial rewrite from the known ethernet mcast dest MAC
409 * There's no MAC fixup, so the last 2 parameters are 0
411 adj_mcast_midchain_update_rewrite(ai, mpls_tunnel_fixup,
414 mpls_tunnel_build_rewrite_i(),
418 case IP_LOOKUP_NEXT_DROP:
419 case IP_LOOKUP_NEXT_PUNT:
420 case IP_LOOKUP_NEXT_LOCAL:
421 case IP_LOOKUP_NEXT_REWRITE:
422 case IP_LOOKUP_NEXT_MIDCHAIN:
423 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
424 case IP_LOOKUP_NEXT_ICMP_ERROR:
425 case IP_LOOKUP_N_NEXT:
430 mpls_tunnel_stack(ai);
434 format_mpls_tunnel_name (u8 * s, va_list * args)
436 u32 dev_instance = va_arg (*args, u32);
437 return format (s, "mpls-tunnel%d", dev_instance);
441 format_mpls_tunnel_device (u8 * s, va_list * args)
443 u32 dev_instance = va_arg (*args, u32);
444 CLIB_UNUSED (int verbose) = va_arg (*args, int);
446 return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
450 * @brief Packet trace structure
452 typedef struct mpls_tunnel_trace_t_
455 * Tunnel-id / index in tunnel vector
458 } mpls_tunnel_trace_t;
461 format_mpls_tunnel_tx_trace (u8 * s,
464 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
465 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
466 mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
468 s = format (s, "MPLS: tunnel %d", t->tunnel_id);
473 * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
476 mpls_tunnel_tx (vlib_main_t * vm,
477 vlib_node_runtime_t * node,
478 vlib_frame_t * frame)
481 u32 * from, * to_next, n_left_from, n_left_to_next;
482 vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
483 const mpls_tunnel_t *mt;
485 mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
487 /* Vector of buffer / pkt indices we're supposed to process */
488 from = vlib_frame_vector_args (frame);
490 /* Number of buffers / pkts */
491 n_left_from = frame->n_vectors;
493 /* Speculatively send the first buffer to the last disposition we used */
494 next_index = node->cached_next_index;
496 while (n_left_from > 0)
498 /* set up to enqueue to our disposition with index = next_index */
499 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
504 while (n_left_from > 0 && n_left_to_next > 0)
516 b0 = vlib_get_buffer(vm, bi0);
518 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_lb.dpoi_index;
519 /* since we are coming out of the L2 world, where the vlib_buffer
520 * union is used for other things, make sure it is clean for
523 vnet_buffer(b0)->mpls.first = 0;
525 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
527 mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
529 tr->tunnel_id = rd->dev_instance;
532 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
533 to_next, n_left_to_next,
534 bi0, mt->mt_l2_lb.dpoi_next_node);
537 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
540 return frame->n_vectors;
543 VNET_DEVICE_CLASS (mpls_tunnel_class) = {
544 .name = "MPLS tunnel device",
545 .format_device_name = format_mpls_tunnel_name,
546 .format_device = format_mpls_tunnel_device,
547 .format_tx_trace = format_mpls_tunnel_tx_trace,
548 .tx_function = mpls_tunnel_tx,
549 .admin_up_down_function = mpls_tunnel_admin_up_down,
552 VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
553 .name = "MPLS-Tunnel",
554 .update_adjacency = mpls_tunnel_update_adj,
555 .build_rewrite = mpls_tunnel_build_rewrite,
556 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
559 const mpls_tunnel_t *
560 mpls_tunnel_get (u32 mti)
562 return (pool_elt_at_index(mpls_tunnel_pool, mti));
566 * @brief Walk all the MPLS tunnels
569 mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
574 pool_foreach_index(mti, mpls_tunnel_pool,
581 vnet_mpls_tunnel_del (u32 sw_if_index)
585 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
590 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
591 fib_path_list_child_remove(mt->mt_path_list,
592 mt->mt_sibling_index);
593 dpo_reset(&mt->mt_l2_lb);
595 vnet_delete_hw_interface (vnet_get_main(), mt->mt_hw_if_index);
597 pool_put(mpls_tunnel_pool, mt);
598 mpls_tunnel_db[sw_if_index] = ~0;
602 vnet_mpls_tunnel_create (u8 l2_only,
605 vnet_hw_interface_t * hi;
610 vnm = vnet_get_main();
611 pool_get(mpls_tunnel_pool, mt);
612 clib_memset (mt, 0, sizeof (*mt));
613 mti = mt - mpls_tunnel_pool;
614 fib_node_init(&mt->mt_node, FIB_NODE_TYPE_MPLS_TUNNEL);
615 mt->mt_path_list = FIB_NODE_INDEX_INVALID;
616 mt->mt_sibling_index = FIB_NODE_INDEX_INVALID;
619 mt->mt_flags |= MPLS_TUNNEL_FLAG_MCAST;
621 mt->mt_flags |= MPLS_TUNNEL_FLAG_L2;
624 * Create a new tunnel HW interface
626 mt->mt_hw_if_index = vnet_register_interface(
628 mpls_tunnel_class.index,
630 mpls_tunnel_hw_interface_class.index,
632 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
634 /* Standard default MPLS tunnel MTU. */
635 vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
638 * Add the new tunnel to the tunnel DB - key:SW if index
640 mt->mt_sw_if_index = hi->sw_if_index;
641 vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
642 mpls_tunnel_db[mt->mt_sw_if_index] = mti;
644 return (mt->mt_sw_if_index);
648 vnet_mpls_tunnel_path_add (u32 sw_if_index,
649 fib_route_path_t *rpaths)
654 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
659 mti = mt - mpls_tunnel_pool;
662 * construct a path-list from the path provided
664 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
666 mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
667 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
668 FIB_NODE_TYPE_MPLS_TUNNEL,
673 fib_node_index_t old_pl_index;
675 old_pl_index = mt->mt_path_list;
678 fib_path_list_copy_and_path_add(old_pl_index,
679 FIB_PATH_LIST_FLAG_SHARED,
682 fib_path_list_child_remove(old_pl_index,
683 mt->mt_sibling_index);
684 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
685 FIB_NODE_TYPE_MPLS_TUNNEL,
688 * re-resolve all the path-extensions with the new path-list
690 fib_path_ext_list_resolve(&mt->mt_path_exts, mt->mt_path_list);
692 fib_path_ext_list_insert(&mt->mt_path_exts,
696 mpls_tunnel_restack(mt);
700 vnet_mpls_tunnel_path_remove (u32 sw_if_index,
701 fib_route_path_t *rpaths)
706 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
711 mti = mt - mpls_tunnel_pool;
714 * construct a path-list from the path provided
716 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
718 /* can't remove a path if we have onoe */
723 fib_node_index_t old_pl_index;
725 old_pl_index = mt->mt_path_list;
728 fib_path_list_copy_and_path_remove(old_pl_index,
729 FIB_PATH_LIST_FLAG_SHARED,
732 fib_path_list_child_remove(old_pl_index,
733 mt->mt_sibling_index);
735 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
742 mt->mt_sibling_index =
743 fib_path_list_child_add(mt->mt_path_list,
744 FIB_NODE_TYPE_MPLS_TUNNEL,
748 * find the matching path extension and remove it
750 fib_path_ext_list_remove(&mt->mt_path_exts,
755 * re-resolve all the path-extensions with the new path-list
757 fib_path_ext_list_resolve(&mt->mt_path_exts,
760 mpls_tunnel_restack(mt);
763 return (fib_path_list_get_n_paths(mt->mt_path_list));
767 vnet_mpls_tunnel_get_index (u32 sw_if_index)
771 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
776 return (mt - mpls_tunnel_pool);
779 static clib_error_t *
780 vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
781 unformat_input_t * input,
782 vlib_cli_command_t * cmd)
784 unformat_input_t _line_input, * line_input = &_line_input;
785 vnet_main_t * vnm = vnet_get_main();
786 u8 is_del = 0, l2_only = 0, is_multicast =0;
787 fib_route_path_t rpath, *rpaths = NULL;
788 u32 sw_if_index = ~0, payload_proto;
789 clib_error_t *error = NULL;
791 clib_memset(&rpath, 0, sizeof(rpath));
792 payload_proto = DPO_PROTO_MPLS;
794 /* Get a line of input. */
795 if (! unformat_user (input, unformat_line_input, line_input))
798 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
800 if (unformat (line_input, "del %U",
801 unformat_vnet_sw_interface, vnm,
804 else if (unformat (line_input, "add %U",
805 unformat_vnet_sw_interface, vnm,
808 else if (unformat (line_input, "add"))
810 else if (unformat (line_input, "l2-only"))
812 else if (unformat (line_input, "multicast"))
814 else if (unformat (line_input, "via %U",
815 unformat_fib_route_path,
816 &rpath, &payload_proto))
817 vec_add1(rpaths, rpath);
820 error = clib_error_return (0, "unknown input '%U'",
821 format_unformat_error, line_input);
830 vnet_mpls_tunnel_del(sw_if_index);
832 else if (!vnet_mpls_tunnel_path_remove(sw_if_index, rpaths))
834 vnet_mpls_tunnel_del(sw_if_index);
839 if (0 == vec_len(rpath.frp_label_stack))
841 error = clib_error_return (0, "No Output Labels '%U'",
842 format_unformat_error, line_input);
846 if (~0 == sw_if_index)
848 sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
850 vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
855 unformat_free (line_input);
861 * This command create a uni-directional MPLS tunnel
864 * @cliexstart{create mpls tunnel}
865 * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
868 VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
869 .path = "mpls tunnel",
871 "mpls tunnel [multicast] [l2-only] via [next-hop-address] [next-hop-interface] [next-hop-table <value>] [weight <value>] [preference <value>] [udp-encap-id <value>] [ip4-lookup-in-table <value>] [ip6-lookup-in-table <value>] [mpls-lookup-in-table <value>] [resolve-via-host] [resolve-via-connected] [rx-ip4 <interface>] [out-labels <value value value>]",
872 .function = vnet_create_mpls_tunnel_command_fn,
876 format_mpls_tunnel (u8 * s, va_list * args)
878 mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
879 mpls_tunnel_attribute_t attr;
881 s = format(s, "mpls_tunnel%d: sw_if_index:%d hw_if_index:%d",
882 mt - mpls_tunnel_pool,
885 if (MPLS_TUNNEL_FLAG_NONE != mt->mt_flags) {
886 s = format(s, " \n flags:");
887 FOR_EACH_MPLS_TUNNEL_ATTRIBUTE(attr) {
888 if ((1<<attr) & mt->mt_flags) {
889 s = format (s, "%s,", mpls_tunnel_attribute_names[attr]);
893 s = format(s, "\n via:\n");
894 s = fib_path_list_format(mt->mt_path_list, s);
895 s = format(s, "%U", format_fib_path_ext_list, &mt->mt_path_exts);
898 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
900 s = format(s, " forwarding: %U\n",
901 format_fib_forw_chain_type,
902 FIB_FORW_CHAIN_TYPE_ETHERNET);
903 s = format(s, " %U\n", format_dpo_id, &mt->mt_l2_lb, 2);
909 static clib_error_t *
910 show_mpls_tunnel_command_fn (vlib_main_t * vm,
911 unformat_input_t * input,
912 vlib_cli_command_t * cmd)
917 if (pool_elts (mpls_tunnel_pool) == 0)
918 vlib_cli_output (vm, "No MPLS tunnels configured...");
920 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
922 if (unformat (input, "%d", &mti))
930 pool_foreach (mt, mpls_tunnel_pool,
932 vlib_cli_output (vm, "[@%d] %U",
933 mt - mpls_tunnel_pool,
934 format_mpls_tunnel, mt);
939 if (pool_is_free_index(mpls_tunnel_pool, mti))
940 return clib_error_return (0, "Not a tunnel index %d", mti);
942 mt = pool_elt_at_index(mpls_tunnel_pool, mti);
944 vlib_cli_output (vm, "[@%d] %U",
945 mt - mpls_tunnel_pool,
946 format_mpls_tunnel, mt);
953 * This command to show MPLS tunnels
956 * @cliexstart{sh mpls tunnel 2}
957 * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
961 * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
962 * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
964 * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
967 VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
968 .path = "show mpls tunnel",
969 .function = show_mpls_tunnel_command_fn,
972 static mpls_tunnel_t *
973 mpls_tunnel_from_fib_node (fib_node_t *node)
975 ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
976 return ((mpls_tunnel_t*) (((char*)node) -
977 STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
981 * Function definition to backwalk a FIB node
983 static fib_node_back_walk_rc_t
984 mpls_tunnel_back_walk (fib_node_t *node,
985 fib_node_back_walk_ctx_t *ctx)
987 mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
989 return (FIB_NODE_BACK_WALK_CONTINUE);
993 * Function definition to get a FIB node from its index
996 mpls_tunnel_fib_node_get (fib_node_index_t index)
1000 mt = pool_elt_at_index(mpls_tunnel_pool, index);
1002 return (&mt->mt_node);
1006 * Function definition to inform the FIB node that its last lock has gone.
1009 mpls_tunnel_last_lock_gone (fib_node_t *node)
1012 * The MPLS MPLS tunnel is a root of the graph. As such
1013 * it never has children and thus is never locked.
1019 * Virtual function table registered by MPLS MPLS tunnels
1020 * for participation in the FIB object graph.
1022 const static fib_node_vft_t mpls_vft = {
1023 .fnv_get = mpls_tunnel_fib_node_get,
1024 .fnv_last_lock = mpls_tunnel_last_lock_gone,
1025 .fnv_back_walk = mpls_tunnel_back_walk,
1028 static clib_error_t *
1029 mpls_tunnel_init (vlib_main_t *vm)
1031 fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
1035 VLIB_INIT_FUNCTION(mpls_tunnel_init);