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 rewrite 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);
248 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
250 adj_nbr_midchain_unstack(ai);
255 * while we're stacking the adj, remove the tunnel from the child list
256 * of the path list. this breaks a circular dependency of walk updates
257 * where the create of adjacencies in the children can lead to walks
258 * that get back here.
260 fib_path_list_lock(mt->mt_path_list);
262 fib_path_list_child_remove(mt->mt_path_list,
263 mt->mt_sibling_index);
266 * Construct the DPO (load-balance or replicate) that we can stack
267 * the tunnel's midchain on
269 if (vnet_hw_interface_get_flags(vnet_get_main(),
270 mt->mt_hw_if_index) &
271 VNET_HW_INTERFACE_FLAG_LINK_UP)
273 dpo_id_t dpo = DPO_INVALID;
275 mpls_tunnel_mk_lb(mt,
277 fib_forw_chain_type_from_link_type(
278 adj_get_link_type(ai)),
281 adj_nbr_midchain_stack(ai, &dpo);
286 adj_nbr_midchain_unstack(ai);
289 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
290 FIB_NODE_TYPE_MPLS_TUNNEL,
291 mt - mpls_tunnel_pool);
293 fib_path_list_unlock(mt->mt_path_list);
297 * @brief Call back when restacking all adjacencies on a MPLS interface
300 mpls_adj_walk_cb (adj_index_t ai,
303 mpls_tunnel_stack(ai);
305 return (ADJ_WALK_RC_CONTINUE);
309 mpls_tunnel_restack (mpls_tunnel_t *mt)
311 fib_protocol_t proto;
314 * walk all the adjacencies on the MPLS interface and restack them
316 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
319 * Stack a load-balance that drops, whilst we have no paths
321 vnet_hw_interface_t * hi;
322 dpo_id_t dpo = DPO_INVALID;
324 mpls_tunnel_mk_lb(mt,
326 FIB_FORW_CHAIN_TYPE_ETHERNET,
329 hi = vnet_get_hw_interface(vnet_get_main(), mt->mt_hw_if_index);
330 dpo_stack_from_node(hi->tx_node_index,
337 FOR_EACH_FIB_PROTOCOL(proto)
339 adj_nbr_walk(mt->mt_sw_if_index,
347 static clib_error_t *
348 mpls_tunnel_admin_up_down (vnet_main_t * vnm,
352 vnet_hw_interface_t * hi;
355 hi = vnet_get_hw_interface (vnm, hw_if_index);
357 mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
362 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
363 vnet_hw_interface_set_flags (vnm, hw_if_index,
364 VNET_HW_INTERFACE_FLAG_LINK_UP);
366 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
368 mpls_tunnel_restack(mt);
374 * @brief Fixup the adj rewrite post encap. This is a no-op since the
375 * rewrite is a stack of labels.
378 mpls_tunnel_fixup (vlib_main_t *vm,
384 * A no-op w.r.t. the header. but reset the 'have we pushed any
385 * MPLS labels onto the packet' flag. That way when we enter the
386 * tunnel we'll get a TTL set to 255
388 vnet_buffer(b0)->mpls.first = 0;
392 mpls_tunnel_update_adj (vnet_main_t * vnm,
398 ASSERT(ADJ_INDEX_INVALID != ai);
402 switch (adj->lookup_next_index)
404 case IP_LOOKUP_NEXT_ARP:
405 case IP_LOOKUP_NEXT_GLEAN:
406 case IP_LOOKUP_NEXT_BCAST:
407 adj_nbr_midchain_update_rewrite(ai, mpls_tunnel_fixup,
410 mpls_tunnel_build_rewrite_i());
412 case IP_LOOKUP_NEXT_MCAST:
414 * Construct a partial rewrite from the known ethernet mcast dest MAC
415 * There's no MAC fixup, so the last 2 parameters are 0
417 adj_mcast_midchain_update_rewrite(ai, mpls_tunnel_fixup,
420 mpls_tunnel_build_rewrite_i(),
424 case IP_LOOKUP_NEXT_DROP:
425 case IP_LOOKUP_NEXT_PUNT:
426 case IP_LOOKUP_NEXT_LOCAL:
427 case IP_LOOKUP_NEXT_REWRITE:
428 case IP_LOOKUP_NEXT_MIDCHAIN:
429 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
430 case IP_LOOKUP_NEXT_ICMP_ERROR:
431 case IP_LOOKUP_N_NEXT:
436 mpls_tunnel_stack(ai);
440 format_mpls_tunnel_name (u8 * s, va_list * args)
442 u32 dev_instance = va_arg (*args, u32);
443 return format (s, "mpls-tunnel%d", dev_instance);
447 format_mpls_tunnel_device (u8 * s, va_list * args)
449 u32 dev_instance = va_arg (*args, u32);
450 CLIB_UNUSED (int verbose) = va_arg (*args, int);
452 return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
456 * @brief Packet trace structure
458 typedef struct mpls_tunnel_trace_t_
461 * Tunnel-id / index in tunnel vector
464 } mpls_tunnel_trace_t;
467 format_mpls_tunnel_tx_trace (u8 * s,
470 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
471 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
472 mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
474 s = format (s, "MPLS: tunnel %d", t->tunnel_id);
479 * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
482 mpls_tunnel_tx (vlib_main_t * vm,
483 vlib_node_runtime_t * node,
484 vlib_frame_t * frame)
487 u32 * from, * to_next, n_left_from, n_left_to_next;
488 vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
489 const mpls_tunnel_t *mt;
491 mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
493 /* Vector of buffer / pkt indices we're supposed to process */
494 from = vlib_frame_vector_args (frame);
496 /* Number of buffers / pkts */
497 n_left_from = frame->n_vectors;
499 /* Speculatively send the first buffer to the last disposition we used */
500 next_index = node->cached_next_index;
502 while (n_left_from > 0)
504 /* set up to enqueue to our disposition with index = next_index */
505 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
510 while (n_left_from > 0 && n_left_to_next > 0)
522 b0 = vlib_get_buffer(vm, bi0);
524 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_lb.dpoi_index;
525 /* since we are coming out of the L2 world, where the vlib_buffer
526 * union is used for other things, make sure it is clean for
529 vnet_buffer(b0)->mpls.first = 0;
531 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
533 mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
535 tr->tunnel_id = rd->dev_instance;
538 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
539 to_next, n_left_to_next,
540 bi0, mt->mt_l2_lb.dpoi_next_node);
543 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
546 return frame->n_vectors;
549 VNET_DEVICE_CLASS (mpls_tunnel_class) = {
550 .name = "MPLS tunnel device",
551 .format_device_name = format_mpls_tunnel_name,
552 .format_device = format_mpls_tunnel_device,
553 .format_tx_trace = format_mpls_tunnel_tx_trace,
554 .tx_function = mpls_tunnel_tx,
555 .admin_up_down_function = mpls_tunnel_admin_up_down,
558 VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
559 .name = "MPLS-Tunnel",
560 .update_adjacency = mpls_tunnel_update_adj,
561 .build_rewrite = mpls_tunnel_build_rewrite,
562 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
565 const mpls_tunnel_t *
566 mpls_tunnel_get (u32 mti)
568 return (pool_elt_at_index(mpls_tunnel_pool, mti));
572 * @brief Walk all the MPLS tunnels
575 mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
580 pool_foreach_index(mti, mpls_tunnel_pool,
587 vnet_mpls_tunnel_del (u32 sw_if_index)
591 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
596 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
597 fib_path_list_child_remove(mt->mt_path_list,
598 mt->mt_sibling_index);
599 dpo_reset(&mt->mt_l2_lb);
601 vnet_delete_hw_interface (vnet_get_main(), mt->mt_hw_if_index);
603 pool_put(mpls_tunnel_pool, mt);
604 mpls_tunnel_db[sw_if_index] = ~0;
608 vnet_mpls_tunnel_create (u8 l2_only,
611 vnet_hw_interface_t * hi;
616 vnm = vnet_get_main();
617 pool_get(mpls_tunnel_pool, mt);
618 clib_memset (mt, 0, sizeof (*mt));
619 mti = mt - mpls_tunnel_pool;
620 fib_node_init(&mt->mt_node, FIB_NODE_TYPE_MPLS_TUNNEL);
621 mt->mt_path_list = FIB_NODE_INDEX_INVALID;
622 mt->mt_sibling_index = FIB_NODE_INDEX_INVALID;
625 mt->mt_flags |= MPLS_TUNNEL_FLAG_MCAST;
627 mt->mt_flags |= MPLS_TUNNEL_FLAG_L2;
630 * Create a new tunnel HW interface
632 mt->mt_hw_if_index = vnet_register_interface(
634 mpls_tunnel_class.index,
636 mpls_tunnel_hw_interface_class.index,
638 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
640 /* Standard default MPLS tunnel MTU. */
641 vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
644 * Add the new tunnel to the tunnel DB - key:SW if index
646 mt->mt_sw_if_index = hi->sw_if_index;
647 vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
648 mpls_tunnel_db[mt->mt_sw_if_index] = mti;
650 return (mt->mt_sw_if_index);
654 vnet_mpls_tunnel_path_add (u32 sw_if_index,
655 fib_route_path_t *rpaths)
660 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
665 mti = mt - mpls_tunnel_pool;
668 * construct a path-list from the path provided
670 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
672 mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
673 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
674 FIB_NODE_TYPE_MPLS_TUNNEL,
679 fib_node_index_t old_pl_index;
681 old_pl_index = mt->mt_path_list;
684 fib_path_list_copy_and_path_add(old_pl_index,
685 FIB_PATH_LIST_FLAG_SHARED,
688 fib_path_list_child_remove(old_pl_index,
689 mt->mt_sibling_index);
690 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
691 FIB_NODE_TYPE_MPLS_TUNNEL,
694 * re-resolve all the path-extensions with the new path-list
696 fib_path_ext_list_resolve(&mt->mt_path_exts, mt->mt_path_list);
698 fib_path_ext_list_insert(&mt->mt_path_exts,
702 mpls_tunnel_restack(mt);
706 vnet_mpls_tunnel_path_remove (u32 sw_if_index,
707 fib_route_path_t *rpaths)
712 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
717 mti = mt - mpls_tunnel_pool;
720 * construct a path-list from the path provided
722 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
724 /* can't remove a path if we have onoe */
729 fib_node_index_t old_pl_index;
731 old_pl_index = mt->mt_path_list;
733 fib_path_list_lock(old_pl_index);
735 fib_path_list_copy_and_path_remove(old_pl_index,
736 FIB_PATH_LIST_FLAG_SHARED,
739 fib_path_list_child_remove(old_pl_index,
740 mt->mt_sibling_index);
742 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
745 fib_path_list_unlock(old_pl_index);
750 mt->mt_sibling_index =
751 fib_path_list_child_add(mt->mt_path_list,
752 FIB_NODE_TYPE_MPLS_TUNNEL,
756 * find the matching path extension and remove it
758 fib_path_ext_list_remove(&mt->mt_path_exts,
763 * re-resolve all the path-extensions with the new path-list
765 fib_path_ext_list_resolve(&mt->mt_path_exts,
768 mpls_tunnel_restack(mt);
769 fib_path_list_unlock(old_pl_index);
772 return (fib_path_list_get_n_paths(mt->mt_path_list));
776 vnet_mpls_tunnel_get_index (u32 sw_if_index)
780 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
785 return (mt - mpls_tunnel_pool);
788 static clib_error_t *
789 vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
790 unformat_input_t * input,
791 vlib_cli_command_t * cmd)
793 unformat_input_t _line_input, * line_input = &_line_input;
794 vnet_main_t * vnm = vnet_get_main();
795 u8 is_del = 0, l2_only = 0, is_multicast =0;
796 fib_route_path_t rpath, *rpaths = NULL;
797 u32 sw_if_index = ~0, payload_proto;
798 clib_error_t *error = NULL;
800 clib_memset(&rpath, 0, sizeof(rpath));
801 payload_proto = DPO_PROTO_MPLS;
803 /* Get a line of input. */
804 if (! unformat_user (input, unformat_line_input, line_input))
807 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
809 if (unformat (line_input, "del %U",
810 unformat_vnet_sw_interface, vnm,
813 else if (unformat (line_input, "add %U",
814 unformat_vnet_sw_interface, vnm,
817 else if (unformat (line_input, "add"))
819 else if (unformat (line_input, "l2-only"))
821 else if (unformat (line_input, "multicast"))
823 else if (unformat (line_input, "via %U",
824 unformat_fib_route_path,
825 &rpath, &payload_proto))
826 vec_add1(rpaths, rpath);
829 error = clib_error_return (0, "unknown input '%U'",
830 format_unformat_error, line_input);
839 vnet_mpls_tunnel_del(sw_if_index);
841 else if (!vnet_mpls_tunnel_path_remove(sw_if_index, rpaths))
843 vnet_mpls_tunnel_del(sw_if_index);
848 if (0 == vec_len(rpath.frp_label_stack))
850 error = clib_error_return (0, "No Output Labels '%U'",
851 format_unformat_error, line_input);
855 if (~0 == sw_if_index)
857 sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
859 vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
864 unformat_free (line_input);
870 * This command create a uni-directional MPLS tunnel
873 * @cliexstart{create mpls tunnel}
874 * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
877 VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
878 .path = "mpls tunnel",
880 "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>]",
881 .function = vnet_create_mpls_tunnel_command_fn,
885 format_mpls_tunnel (u8 * s, va_list * args)
887 mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
888 mpls_tunnel_attribute_t attr;
890 s = format(s, "mpls-tunnel%d: sw_if_index:%d hw_if_index:%d",
891 mt - mpls_tunnel_pool,
894 if (MPLS_TUNNEL_FLAG_NONE != mt->mt_flags) {
895 s = format(s, " \n flags:");
896 FOR_EACH_MPLS_TUNNEL_ATTRIBUTE(attr) {
897 if ((1<<attr) & mt->mt_flags) {
898 s = format (s, "%s,", mpls_tunnel_attribute_names[attr]);
902 s = format(s, "\n via:\n");
903 s = fib_path_list_format(mt->mt_path_list, s);
904 s = format(s, "%U", format_fib_path_ext_list, &mt->mt_path_exts);
907 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
909 s = format(s, " forwarding: %U\n",
910 format_fib_forw_chain_type,
911 FIB_FORW_CHAIN_TYPE_ETHERNET);
912 s = format(s, " %U\n", format_dpo_id, &mt->mt_l2_lb, 2);
918 static clib_error_t *
919 show_mpls_tunnel_command_fn (vlib_main_t * vm,
920 unformat_input_t * input,
921 vlib_cli_command_t * cmd)
926 if (pool_elts (mpls_tunnel_pool) == 0)
927 vlib_cli_output (vm, "No MPLS tunnels configured...");
929 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
931 if (unformat (input, "%d", &mti))
939 pool_foreach (mt, mpls_tunnel_pool,
941 vlib_cli_output (vm, "[@%d] %U",
942 mt - mpls_tunnel_pool,
943 format_mpls_tunnel, mt);
948 if (pool_is_free_index(mpls_tunnel_pool, mti))
949 return clib_error_return (0, "Not a tunnel index %d", mti);
951 mt = pool_elt_at_index(mpls_tunnel_pool, mti);
953 vlib_cli_output (vm, "[@%d] %U",
954 mt - mpls_tunnel_pool,
955 format_mpls_tunnel, mt);
962 * This command to show MPLS tunnels
965 * @cliexstart{sh mpls tunnel 2}
966 * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
970 * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
971 * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
973 * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
976 VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
977 .path = "show mpls tunnel",
978 .function = show_mpls_tunnel_command_fn,
981 static mpls_tunnel_t *
982 mpls_tunnel_from_fib_node (fib_node_t *node)
984 ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
985 return ((mpls_tunnel_t*) (((char*)node) -
986 STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
990 * Function definition to backwalk a FIB node
992 static fib_node_back_walk_rc_t
993 mpls_tunnel_back_walk (fib_node_t *node,
994 fib_node_back_walk_ctx_t *ctx)
996 mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
998 return (FIB_NODE_BACK_WALK_CONTINUE);
1002 * Function definition to get a FIB node from its index
1005 mpls_tunnel_fib_node_get (fib_node_index_t index)
1009 mt = pool_elt_at_index(mpls_tunnel_pool, index);
1011 return (&mt->mt_node);
1015 * Function definition to inform the FIB node that its last lock has gone.
1018 mpls_tunnel_last_lock_gone (fib_node_t *node)
1021 * The MPLS MPLS tunnel is a root of the graph. As such
1022 * it never has children and thus is never locked.
1028 * Virtual function table registered by MPLS MPLS tunnels
1029 * for participation in the FIB object graph.
1031 const static fib_node_vft_t mpls_vft = {
1032 .fnv_get = mpls_tunnel_fib_node_get,
1033 .fnv_last_lock = mpls_tunnel_last_lock_gone,
1034 .fnv_back_walk = mpls_tunnel_back_walk,
1037 static clib_error_t *
1038 mpls_tunnel_init (vlib_main_t *vm)
1040 fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
1044 VLIB_INIT_FUNCTION(mpls_tunnel_init);