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 fib_path_list_walk(mt->mt_path_list,
169 mpls_tunnel_collect_forwarding,
172 if (!dpo_id_is_valid(dpo_lb))
177 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
182 replicate_create(0, lb_proto));
186 flow_hash_config_t fhc;
191 fhc = MPLS_FLOW_HASH_DEFAULT;
195 fhc = IP_FLOW_HASH_DEFAULT;
205 load_balance_create(0, lb_proto, fhc));
209 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
214 replicate_multipath_update(dpo_lb, ctx.next_hops);
218 load_balance_multipath_update(dpo_lb,
220 LOAD_BALANCE_FLAG_NONE);
221 vec_free(ctx.next_hops);
228 * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
231 mpls_tunnel_stack (adj_index_t ai)
238 sw_if_index = adj->rewrite_header.sw_if_index;
240 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
246 * while we're stacking the adj, remove the tunnel from the child list
247 * of the path list. this breaks a circular dependency of walk updates
248 * where the create of adjacencies in the children can lead to walks
249 * that get back here.
251 fib_path_list_lock(mt->mt_path_list);
253 fib_path_list_child_remove(mt->mt_path_list,
254 mt->mt_sibling_index);
257 * Construct the DPO (load-balance or replicate) that we can stack
258 * the tunnel's midchain on
260 if (vnet_hw_interface_get_flags(vnet_get_main(),
261 mt->mt_hw_if_index) &
262 VNET_HW_INTERFACE_FLAG_LINK_UP)
264 dpo_id_t dpo = DPO_INVALID;
266 mpls_tunnel_mk_lb(mt,
268 fib_forw_chain_type_from_link_type(
269 adj_get_link_type(ai)),
272 adj_nbr_midchain_stack(ai, &dpo);
277 adj_nbr_midchain_unstack(ai);
280 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
281 FIB_NODE_TYPE_MPLS_TUNNEL,
282 mt - mpls_tunnel_pool);
284 fib_path_list_unlock(mt->mt_path_list);
288 * @brief Call back when restacking all adjacencies on a MPLS interface
291 mpls_adj_walk_cb (adj_index_t ai,
294 mpls_tunnel_stack(ai);
296 return (ADJ_WALK_RC_CONTINUE);
300 mpls_tunnel_restack (mpls_tunnel_t *mt)
302 fib_protocol_t proto;
305 * walk all the adjacencies on the MPLS interface and restack them
307 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
310 * Stack a load-balance that drops, whilst we have no paths
312 vnet_hw_interface_t * hi;
313 dpo_id_t dpo = DPO_INVALID;
315 mpls_tunnel_mk_lb(mt,
317 FIB_FORW_CHAIN_TYPE_ETHERNET,
320 hi = vnet_get_hw_interface(vnet_get_main(), mt->mt_hw_if_index);
321 dpo_stack_from_node(hi->tx_node_index,
328 FOR_EACH_FIB_PROTOCOL(proto)
330 adj_nbr_walk(mt->mt_sw_if_index,
338 static clib_error_t *
339 mpls_tunnel_admin_up_down (vnet_main_t * vnm,
343 vnet_hw_interface_t * hi;
346 hi = vnet_get_hw_interface (vnm, hw_if_index);
348 mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
353 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
354 vnet_hw_interface_set_flags (vnm, hw_if_index,
355 VNET_HW_INTERFACE_FLAG_LINK_UP);
357 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
359 mpls_tunnel_restack(mt);
365 * @brief Fixup the adj rewrite post encap. This is a no-op since the
366 * rewrite is a stack of labels.
369 mpls_tunnel_fixup (vlib_main_t *vm,
375 * A no-op w.r.t. the header. but reset the 'have we pushed any
376 * MPLS labels onto the packet' flag. That way when we enter the
377 * tunnel we'll get a TTL set to 255
379 vnet_buffer(b0)->mpls.first = 0;
383 mpls_tunnel_update_adj (vnet_main_t * vnm,
389 ASSERT(ADJ_INDEX_INVALID != ai);
393 switch (adj->lookup_next_index)
395 case IP_LOOKUP_NEXT_ARP:
396 case IP_LOOKUP_NEXT_GLEAN:
397 case IP_LOOKUP_NEXT_BCAST:
398 adj_nbr_midchain_update_rewrite(ai, mpls_tunnel_fixup,
401 mpls_tunnel_build_rewrite_i());
403 case IP_LOOKUP_NEXT_MCAST:
405 * Construct a partial rewrite from the known ethernet mcast dest MAC
406 * There's no MAC fixup, so the last 2 parameters are 0
408 adj_mcast_midchain_update_rewrite(ai, mpls_tunnel_fixup,
411 mpls_tunnel_build_rewrite_i(),
415 case IP_LOOKUP_NEXT_DROP:
416 case IP_LOOKUP_NEXT_PUNT:
417 case IP_LOOKUP_NEXT_LOCAL:
418 case IP_LOOKUP_NEXT_REWRITE:
419 case IP_LOOKUP_NEXT_MIDCHAIN:
420 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
421 case IP_LOOKUP_NEXT_ICMP_ERROR:
422 case IP_LOOKUP_N_NEXT:
427 mpls_tunnel_stack(ai);
431 format_mpls_tunnel_name (u8 * s, va_list * args)
433 u32 dev_instance = va_arg (*args, u32);
434 return format (s, "mpls-tunnel%d", dev_instance);
438 format_mpls_tunnel_device (u8 * s, va_list * args)
440 u32 dev_instance = va_arg (*args, u32);
441 CLIB_UNUSED (int verbose) = va_arg (*args, int);
443 return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
447 * @brief Packet trace structure
449 typedef struct mpls_tunnel_trace_t_
452 * Tunnel-id / index in tunnel vector
455 } mpls_tunnel_trace_t;
458 format_mpls_tunnel_tx_trace (u8 * s,
461 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
462 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
463 mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
465 s = format (s, "MPLS: tunnel %d", t->tunnel_id);
470 * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
473 mpls_tunnel_tx (vlib_main_t * vm,
474 vlib_node_runtime_t * node,
475 vlib_frame_t * frame)
478 u32 * from, * to_next, n_left_from, n_left_to_next;
479 vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
480 const mpls_tunnel_t *mt;
482 mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
484 /* Vector of buffer / pkt indices we're supposed to process */
485 from = vlib_frame_vector_args (frame);
487 /* Number of buffers / pkts */
488 n_left_from = frame->n_vectors;
490 /* Speculatively send the first buffer to the last disposition we used */
491 next_index = node->cached_next_index;
493 while (n_left_from > 0)
495 /* set up to enqueue to our disposition with index = next_index */
496 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
501 while (n_left_from > 0 && n_left_to_next > 0)
513 b0 = vlib_get_buffer(vm, bi0);
515 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_lb.dpoi_index;
516 /* since we are coming out of the L2 world, where the vlib_buffer
517 * union is used for other things, make sure it is clean for
520 vnet_buffer(b0)->mpls.first = 0;
522 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
524 mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
526 tr->tunnel_id = rd->dev_instance;
529 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
530 to_next, n_left_to_next,
531 bi0, mt->mt_l2_lb.dpoi_next_node);
534 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
537 return frame->n_vectors;
540 VNET_DEVICE_CLASS (mpls_tunnel_class) = {
541 .name = "MPLS tunnel device",
542 .format_device_name = format_mpls_tunnel_name,
543 .format_device = format_mpls_tunnel_device,
544 .format_tx_trace = format_mpls_tunnel_tx_trace,
545 .tx_function = mpls_tunnel_tx,
546 .admin_up_down_function = mpls_tunnel_admin_up_down,
549 VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
550 .name = "MPLS-Tunnel",
551 .update_adjacency = mpls_tunnel_update_adj,
552 .build_rewrite = mpls_tunnel_build_rewrite,
553 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
556 const mpls_tunnel_t *
557 mpls_tunnel_get (u32 mti)
559 return (pool_elt_at_index(mpls_tunnel_pool, mti));
563 * @brief Walk all the MPLS tunnels
566 mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
571 pool_foreach_index(mti, mpls_tunnel_pool,
578 vnet_mpls_tunnel_del (u32 sw_if_index)
582 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
587 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
588 fib_path_list_child_remove(mt->mt_path_list,
589 mt->mt_sibling_index);
590 dpo_reset(&mt->mt_l2_lb);
592 vnet_delete_hw_interface (vnet_get_main(), mt->mt_hw_if_index);
594 pool_put(mpls_tunnel_pool, mt);
595 mpls_tunnel_db[sw_if_index] = ~0;
599 vnet_mpls_tunnel_create (u8 l2_only,
602 vnet_hw_interface_t * hi;
607 vnm = vnet_get_main();
608 pool_get(mpls_tunnel_pool, mt);
609 memset (mt, 0, sizeof (*mt));
610 mti = mt - mpls_tunnel_pool;
611 fib_node_init(&mt->mt_node, FIB_NODE_TYPE_MPLS_TUNNEL);
612 mt->mt_path_list = FIB_NODE_INDEX_INVALID;
613 mt->mt_sibling_index = FIB_NODE_INDEX_INVALID;
616 mt->mt_flags |= MPLS_TUNNEL_FLAG_MCAST;
618 mt->mt_flags |= MPLS_TUNNEL_FLAG_L2;
621 * Create a new tunnel HW interface
623 mt->mt_hw_if_index = vnet_register_interface(
625 mpls_tunnel_class.index,
627 mpls_tunnel_hw_interface_class.index,
629 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
631 /* Standard default MPLS tunnel MTU. */
632 vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
635 * Add the new tunnel to the tunnel DB - key:SW if index
637 mt->mt_sw_if_index = hi->sw_if_index;
638 vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
639 mpls_tunnel_db[mt->mt_sw_if_index] = mti;
641 return (mt->mt_sw_if_index);
645 vnet_mpls_tunnel_path_add (u32 sw_if_index,
646 fib_route_path_t *rpaths)
651 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
656 mti = mt - mpls_tunnel_pool;
659 * construct a path-list from the path provided
661 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
663 mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
664 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
665 FIB_NODE_TYPE_MPLS_TUNNEL,
670 fib_node_index_t old_pl_index;
672 old_pl_index = mt->mt_path_list;
675 fib_path_list_copy_and_path_add(old_pl_index,
676 FIB_PATH_LIST_FLAG_SHARED,
679 fib_path_list_child_remove(old_pl_index,
680 mt->mt_sibling_index);
681 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
682 FIB_NODE_TYPE_MPLS_TUNNEL,
685 * re-resolve all the path-extensions with the new path-list
687 fib_path_ext_list_resolve(&mt->mt_path_exts, mt->mt_path_list);
689 fib_path_ext_list_insert(&mt->mt_path_exts,
693 mpls_tunnel_restack(mt);
697 vnet_mpls_tunnel_path_remove (u32 sw_if_index,
698 fib_route_path_t *rpaths)
703 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
708 mti = mt - mpls_tunnel_pool;
711 * construct a path-list from the path provided
713 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
715 /* can't remove a path if we have onoe */
720 fib_node_index_t old_pl_index;
722 old_pl_index = mt->mt_path_list;
725 fib_path_list_copy_and_path_remove(old_pl_index,
726 FIB_PATH_LIST_FLAG_SHARED,
729 fib_path_list_child_remove(old_pl_index,
730 mt->mt_sibling_index);
732 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
739 mt->mt_sibling_index =
740 fib_path_list_child_add(mt->mt_path_list,
741 FIB_NODE_TYPE_MPLS_TUNNEL,
745 * find the matching path extension and remove it
747 fib_path_ext_list_remove(&mt->mt_path_exts,
752 * re-resolve all the path-extensions with the new path-list
754 fib_path_ext_list_resolve(&mt->mt_path_exts,
757 mpls_tunnel_restack(mt);
760 return (fib_path_list_get_n_paths(mt->mt_path_list));
764 static clib_error_t *
765 vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
766 unformat_input_t * input,
767 vlib_cli_command_t * cmd)
769 unformat_input_t _line_input, * line_input = &_line_input;
770 vnet_main_t * vnm = vnet_get_main();
771 u8 is_del = 0, l2_only = 0, is_multicast =0;
772 fib_route_path_t rpath, *rpaths = NULL;
773 u32 sw_if_index = ~0, payload_proto;
774 clib_error_t *error = NULL;
776 memset(&rpath, 0, sizeof(rpath));
777 payload_proto = DPO_PROTO_MPLS;
779 /* Get a line of input. */
780 if (! unformat_user (input, unformat_line_input, line_input))
783 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
785 if (unformat (line_input, "del %U",
786 unformat_vnet_sw_interface, vnm,
789 else if (unformat (line_input, "add %U",
790 unformat_vnet_sw_interface, vnm,
793 else if (unformat (line_input, "add"))
795 else if (unformat (line_input, "l2-only"))
797 else if (unformat (line_input, "multicast"))
799 else if (unformat (line_input, "via %U",
800 unformat_fib_route_path,
801 &rpath, &payload_proto))
802 vec_add1(rpaths, rpath);
805 error = clib_error_return (0, "unknown input '%U'",
806 format_unformat_error, line_input);
815 vnet_mpls_tunnel_del(sw_if_index);
817 else if (!vnet_mpls_tunnel_path_remove(sw_if_index, rpaths))
819 vnet_mpls_tunnel_del(sw_if_index);
824 if (0 == vec_len(rpath.frp_label_stack))
826 error = clib_error_return (0, "No Output Labels '%U'",
827 format_unformat_error, line_input);
831 if (~0 == sw_if_index)
833 sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
835 vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
840 unformat_free (line_input);
846 * This command create a uni-directional MPLS tunnel
849 * @cliexstart{create mpls tunnel}
850 * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
853 VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
854 .path = "mpls tunnel",
856 "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>]",
857 .function = vnet_create_mpls_tunnel_command_fn,
861 format_mpls_tunnel (u8 * s, va_list * args)
863 mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
864 mpls_tunnel_attribute_t attr;
866 s = format(s, "mpls_tunnel%d: sw_if_index:%d hw_if_index:%d",
867 mt - mpls_tunnel_pool,
870 if (MPLS_TUNNEL_FLAG_NONE != mt->mt_flags) {
871 s = format(s, " \n flags:");
872 FOR_EACH_MPLS_TUNNEL_ATTRIBUTE(attr) {
873 if ((1<<attr) & mt->mt_flags) {
874 s = format (s, "%s,", mpls_tunnel_attribute_names[attr]);
878 s = format(s, "\n via:\n");
879 s = fib_path_list_format(mt->mt_path_list, s);
880 s = format(s, "%U", format_fib_path_ext_list, &mt->mt_path_exts);
883 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
885 s = format(s, " forwarding: %U\n",
886 format_fib_forw_chain_type,
887 FIB_FORW_CHAIN_TYPE_ETHERNET);
888 s = format(s, " %U\n", format_dpo_id, &mt->mt_l2_lb, 2);
894 static clib_error_t *
895 show_mpls_tunnel_command_fn (vlib_main_t * vm,
896 unformat_input_t * input,
897 vlib_cli_command_t * cmd)
902 if (pool_elts (mpls_tunnel_pool) == 0)
903 vlib_cli_output (vm, "No MPLS tunnels configured...");
905 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
907 if (unformat (input, "%d", &mti))
915 pool_foreach (mt, mpls_tunnel_pool,
917 vlib_cli_output (vm, "[@%d] %U",
918 mt - mpls_tunnel_pool,
919 format_mpls_tunnel, mt);
924 if (pool_is_free_index(mpls_tunnel_pool, mti))
925 return clib_error_return (0, "Not atunnel index %d", mti);
927 mt = pool_elt_at_index(mpls_tunnel_pool, mti);
929 vlib_cli_output (vm, "[@%d] %U",
930 mt - mpls_tunnel_pool,
931 format_mpls_tunnel, mt);
938 * This command to show MPLS tunnels
941 * @cliexstart{sh mpls tunnel 2}
942 * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
946 * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
947 * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
949 * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
952 VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
953 .path = "show mpls tunnel",
954 .function = show_mpls_tunnel_command_fn,
957 static mpls_tunnel_t *
958 mpls_tunnel_from_fib_node (fib_node_t *node)
960 ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
961 return ((mpls_tunnel_t*) (((char*)node) -
962 STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
966 * Function definition to backwalk a FIB node
968 static fib_node_back_walk_rc_t
969 mpls_tunnel_back_walk (fib_node_t *node,
970 fib_node_back_walk_ctx_t *ctx)
972 mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
974 return (FIB_NODE_BACK_WALK_CONTINUE);
978 * Function definition to get a FIB node from its index
981 mpls_tunnel_fib_node_get (fib_node_index_t index)
985 mt = pool_elt_at_index(mpls_tunnel_pool, index);
987 return (&mt->mt_node);
991 * Function definition to inform the FIB node that its last lock has gone.
994 mpls_tunnel_last_lock_gone (fib_node_t *node)
997 * The MPLS MPLS tunnel is a root of the graph. As such
998 * it never has children and thus is never locked.
1004 * Virtual function table registered by MPLS MPLS tunnels
1005 * for participation in the FIB object graph.
1007 const static fib_node_vft_t mpls_vft = {
1008 .fnv_get = mpls_tunnel_fib_node_get,
1009 .fnv_last_lock = mpls_tunnel_last_lock_gone,
1010 .fnv_back_walk = mpls_tunnel_back_walk,
1013 static clib_error_t *
1014 mpls_tunnel_init (vlib_main_t *vm)
1016 fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
1020 VLIB_INIT_FUNCTION(mpls_tunnel_init);