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 Pool of free tunnel SW indices - i.e. recycled indices
37 static u32 * mpls_tunnel_free_hw_if_indices;
40 * @brief DB of SW index to tunnel index
42 static u32 *mpls_tunnel_db;
45 * @brief MPLS tunnel flags strings
47 static const char *mpls_tunnel_attribute_names[] = MPLS_TUNNEL_ATTRIBUTES;
50 * @brief Get a tunnel object from a SW interface index
53 mpls_tunnel_get_from_sw_if_index (u32 sw_if_index)
55 if ((vec_len(mpls_tunnel_db) < sw_if_index) ||
56 (~0 == mpls_tunnel_db[sw_if_index]))
59 return (pool_elt_at_index(mpls_tunnel_pool,
60 mpls_tunnel_db[sw_if_index]));
64 * @brief Build a rewrite string for the MPLS tunnel.
67 mpls_tunnel_build_rewrite_i (void)
70 * passing the adj code a NULL rewirte means 'i don't have one cos
71 * t'other end is unresolved'. That's not the case here. For the mpls
72 * tunnel there are just no bytes of encap to apply in the adj. We'll impose
73 * the label stack once we choose a path. So return a zero length rewrite.
77 vec_validate(rewrite, 0);
78 vec_reset_length(rewrite);
84 * @brief Build a rewrite string for the MPLS tunnel.
87 mpls_tunnel_build_rewrite (vnet_main_t * vnm,
89 vnet_link_t link_type,
90 const void *dst_address)
92 return (mpls_tunnel_build_rewrite_i());
95 typedef struct mpls_tunnel_collect_forwarding_ctx_t_
97 load_balance_path_t * next_hops;
98 const mpls_tunnel_t *mt;
99 fib_forward_chain_type_t fct;
100 } mpls_tunnel_collect_forwarding_ctx_t;
102 static fib_path_list_walk_rc_t
103 mpls_tunnel_collect_forwarding (fib_node_index_t pl_index,
104 fib_node_index_t path_index,
107 mpls_tunnel_collect_forwarding_ctx_t *ctx;
108 fib_path_ext_t *path_ext;
113 * if the path is not resolved, don't include it.
115 if (!fib_path_is_resolved(path_index))
117 return (FIB_PATH_LIST_WALK_CONTINUE);
121 * get the matching path-extension for the path being visited.
123 path_ext = fib_path_ext_list_find_by_path_index(&ctx->mt->mt_path_exts,
126 if (NULL != path_ext)
129 * found a matching extension. stack it to obtain the forwarding
130 * info for this path.
132 ctx->next_hops = fib_path_ext_stack(path_ext,
141 * There should be a path-extenios associated with each path
144 return (FIB_PATH_LIST_WALK_CONTINUE);
148 mpls_tunnel_mk_lb (mpls_tunnel_t *mt,
150 fib_forward_chain_type_t fct,
153 dpo_proto_t lb_proto;
156 * If the entry has path extensions then we construct a load-balance
157 * by stacking the extensions on the forwarding chains of the paths.
158 * Otherwise we use the load-balance of the path-list
160 mpls_tunnel_collect_forwarding_ctx_t ctx = {
167 * As an optimisation we allocate the vector of next-hops to be sized
168 * equal to the maximum nuber of paths we will need, which is also the
169 * most likely number we will need, since in most cases the paths are 'up'.
171 vec_validate(ctx.next_hops, fib_path_list_get_n_paths(mt->mt_path_list));
172 vec_reset_length(ctx.next_hops);
174 lb_proto = vnet_link_to_dpo_proto(linkt);
176 fib_path_list_walk(mt->mt_path_list,
177 mpls_tunnel_collect_forwarding,
180 if (!dpo_id_is_valid(dpo_lb))
185 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
190 replicate_create(0, lb_proto));
194 flow_hash_config_t fhc;
199 fhc = MPLS_FLOW_HASH_DEFAULT;
203 fhc = IP_FLOW_HASH_DEFAULT;
213 load_balance_create(0, lb_proto, fhc));
217 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
222 replicate_multipath_update(dpo_lb, ctx.next_hops);
226 load_balance_multipath_update(dpo_lb,
228 LOAD_BALANCE_FLAG_NONE);
229 vec_free(ctx.next_hops);
236 * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
239 mpls_tunnel_stack (adj_index_t ai)
246 sw_if_index = adj->rewrite_header.sw_if_index;
248 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
254 * while we're stacking the adj, remove the tunnel from the child list
255 * of the path list. this breaks a circular dependency of walk updates
256 * where the create of adjacencies in the children can lead to walks
257 * that get back here.
259 fib_path_list_lock(mt->mt_path_list);
261 fib_path_list_child_remove(mt->mt_path_list,
262 mt->mt_sibling_index);
265 * Construct the DPO (load-balance or replicate) that we can stack
266 * the tunnel's midchain on
268 if (vnet_hw_interface_get_flags(vnet_get_main(),
269 mt->mt_hw_if_index) &
270 VNET_HW_INTERFACE_FLAG_LINK_UP)
272 dpo_id_t dpo = DPO_INVALID;
274 mpls_tunnel_mk_lb(mt,
276 (VNET_LINK_MPLS == adj_get_link_type(ai) ?
277 FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
278 FIB_FORW_CHAIN_TYPE_MPLS_EOS),
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_lock(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 FOR_EACH_FIB_PROTOCOL(proto)
318 adj_nbr_walk(mt->mt_sw_if_index,
325 static clib_error_t *
326 mpls_tunnel_admin_up_down (vnet_main_t * vnm,
330 vnet_hw_interface_t * hi;
333 hi = vnet_get_hw_interface (vnm, hw_if_index);
335 mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
340 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
341 vnet_hw_interface_set_flags (vnm, hw_if_index,
342 VNET_HW_INTERFACE_FLAG_LINK_UP);
344 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
346 mpls_tunnel_restack(mt);
352 * @brief Fixup the adj rewrite post encap. This is a no-op since the
353 * rewrite is a stack of labels.
356 mpls_tunnel_fixup (vlib_main_t *vm,
361 * A no-op w.r.t. the header. but reset the 'have we pushed any
362 * MPLS labels onto the packet' flag. That way when we enter the
363 * tunnel we'll get a TTL set to 255
365 vnet_buffer(b0)->mpls.first = 0;
369 mpls_tunnel_update_adj (vnet_main_t * vnm,
375 ASSERT(ADJ_INDEX_INVALID != ai);
379 switch (adj->lookup_next_index)
381 case IP_LOOKUP_NEXT_ARP:
382 case IP_LOOKUP_NEXT_GLEAN:
383 adj_nbr_midchain_update_rewrite(ai, mpls_tunnel_fixup,
385 mpls_tunnel_build_rewrite_i());
387 case IP_LOOKUP_NEXT_MCAST:
389 * Construct a partial rewrite from the known ethernet mcast dest MAC
390 * There's no MAC fixup, so the last 2 parameters are 0
392 adj_mcast_midchain_update_rewrite(ai, mpls_tunnel_fixup,
394 mpls_tunnel_build_rewrite_i(),
398 case IP_LOOKUP_NEXT_DROP:
399 case IP_LOOKUP_NEXT_PUNT:
400 case IP_LOOKUP_NEXT_LOCAL:
401 case IP_LOOKUP_NEXT_REWRITE:
402 case IP_LOOKUP_NEXT_MIDCHAIN:
403 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
404 case IP_LOOKUP_NEXT_ICMP_ERROR:
405 case IP_LOOKUP_N_NEXT:
410 mpls_tunnel_stack(ai);
414 format_mpls_tunnel_name (u8 * s, va_list * args)
416 u32 dev_instance = va_arg (*args, u32);
417 return format (s, "mpls-tunnel%d", dev_instance);
421 format_mpls_tunnel_device (u8 * s, va_list * args)
423 u32 dev_instance = va_arg (*args, u32);
424 CLIB_UNUSED (int verbose) = va_arg (*args, int);
426 return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
430 * @brief Packet trace structure
432 typedef struct mpls_tunnel_trace_t_
435 * Tunnel-id / index in tunnel vector
438 } mpls_tunnel_trace_t;
441 format_mpls_tunnel_tx_trace (u8 * s,
444 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
445 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
446 mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
448 s = format (s, "MPLS: tunnel %d", t->tunnel_id);
453 * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
456 mpls_tunnel_tx (vlib_main_t * vm,
457 vlib_node_runtime_t * node,
458 vlib_frame_t * frame)
461 u32 * from, * to_next, n_left_from, n_left_to_next;
462 vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
463 const mpls_tunnel_t *mt;
465 mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
467 /* Vector of buffer / pkt indices we're supposed to process */
468 from = vlib_frame_vector_args (frame);
470 /* Number of buffers / pkts */
471 n_left_from = frame->n_vectors;
473 /* Speculatively send the first buffer to the last disposition we used */
474 next_index = node->cached_next_index;
476 while (n_left_from > 0)
478 /* set up to enqueue to our disposition with index = next_index */
479 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
484 while (n_left_from > 0 && n_left_to_next > 0)
496 b0 = vlib_get_buffer(vm, bi0);
498 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_adj;
500 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
502 mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
504 tr->tunnel_id = rd->dev_instance;
507 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
508 to_next, n_left_to_next,
509 bi0, mt->mt_l2_tx_arc);
512 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
515 return frame->n_vectors;
518 VNET_DEVICE_CLASS (mpls_tunnel_class) = {
519 .name = "MPLS tunnel device",
520 .format_device_name = format_mpls_tunnel_name,
521 .format_device = format_mpls_tunnel_device,
522 .format_tx_trace = format_mpls_tunnel_tx_trace,
523 .tx_function = mpls_tunnel_tx,
524 .admin_up_down_function = mpls_tunnel_admin_up_down,
527 VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
528 .name = "MPLS-Tunnel",
529 // .format_header = format_mpls_eth_header_with_length,
530 // .unformat_header = unformat_mpls_eth_header,
531 .update_adjacency = mpls_tunnel_update_adj,
532 .build_rewrite = mpls_tunnel_build_rewrite,
533 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
536 const mpls_tunnel_t *
537 mpls_tunnel_get (u32 mti)
539 return (pool_elt_at_index(mpls_tunnel_pool, mti));
543 * @brief Walk all the MPLS tunnels
546 mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
551 pool_foreach_index(mti, mpls_tunnel_pool,
558 vnet_mpls_tunnel_del (u32 sw_if_index)
562 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
567 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
568 fib_path_list_child_remove(mt->mt_path_list,
569 mt->mt_sibling_index);
570 if (ADJ_INDEX_INVALID != mt->mt_l2_adj)
571 adj_unlock(mt->mt_l2_adj);
573 vec_add1 (mpls_tunnel_free_hw_if_indices, mt->mt_hw_if_index);
574 pool_put(mpls_tunnel_pool, mt);
575 mpls_tunnel_db[sw_if_index] = ~0;
579 vnet_mpls_tunnel_create (u8 l2_only,
582 vnet_hw_interface_t * hi;
587 vnm = vnet_get_main();
588 pool_get(mpls_tunnel_pool, mt);
589 memset (mt, 0, sizeof (*mt));
590 mti = mt - mpls_tunnel_pool;
591 fib_node_init(&mt->mt_node, FIB_NODE_TYPE_MPLS_TUNNEL);
592 mt->mt_l2_adj = ADJ_INDEX_INVALID;
593 mt->mt_path_list = FIB_NODE_INDEX_INVALID;
594 mt->mt_sibling_index = FIB_NODE_INDEX_INVALID;
597 mt->mt_flags |= MPLS_TUNNEL_FLAG_MCAST;
600 * Create a new, or re=use and old, tunnel HW interface
602 if (vec_len (mpls_tunnel_free_hw_if_indices) > 0)
605 mpls_tunnel_free_hw_if_indices[vec_len(mpls_tunnel_free_hw_if_indices)-1];
606 _vec_len (mpls_tunnel_free_hw_if_indices) -= 1;
607 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
608 hi->hw_instance = mti;
609 hi->dev_instance = mti;
613 mt->mt_hw_if_index = vnet_register_interface(
615 mpls_tunnel_class.index,
617 mpls_tunnel_hw_interface_class.index,
619 hi = vnet_get_hw_interface(vnm, mt->mt_hw_if_index);
623 * Add the new tunnel to the tunnel DB - key:SW if index
625 mt->mt_sw_if_index = hi->sw_if_index;
626 vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
627 mpls_tunnel_db[mt->mt_sw_if_index] = mti;
632 adj_nbr_add_or_lock(fib_path_list_get_proto(mt->mt_path_list),
637 mt->mt_l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
642 return (mt->mt_sw_if_index);
646 vnet_mpls_tunnel_path_add (u32 sw_if_index,
647 fib_route_path_t *rpaths)
652 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
657 mti = mt - mpls_tunnel_pool;
660 * construct a path-list from the path provided
662 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
664 mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
665 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
666 FIB_NODE_TYPE_MPLS_TUNNEL,
671 fib_node_index_t old_pl_index;
673 old_pl_index = mt->mt_path_list;
676 fib_path_list_copy_and_path_add(old_pl_index,
677 FIB_PATH_LIST_FLAG_SHARED,
680 fib_path_list_child_remove(old_pl_index,
681 mt->mt_sibling_index);
682 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
683 FIB_NODE_TYPE_MPLS_TUNNEL,
686 * re-resolve all the path-extensions with the new path-list
688 fib_path_ext_list_resolve(&mt->mt_path_exts, mt->mt_path_list);
690 fib_path_ext_list_insert(&mt->mt_path_exts,
694 mpls_tunnel_restack(mt);
698 vnet_mpls_tunnel_path_remove (u32 sw_if_index,
699 fib_route_path_t *rpaths)
704 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
709 mti = mt - mpls_tunnel_pool;
712 * construct a path-list from the path provided
714 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
716 /* can't remove a path if we have onoe */
721 fib_node_index_t old_pl_index;
723 old_pl_index = mt->mt_path_list;
726 fib_path_list_copy_and_path_remove(old_pl_index,
727 FIB_PATH_LIST_FLAG_SHARED,
730 fib_path_list_child_remove(old_pl_index,
731 mt->mt_sibling_index);
733 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
740 mt->mt_sibling_index =
741 fib_path_list_child_add(mt->mt_path_list,
742 FIB_NODE_TYPE_MPLS_TUNNEL,
746 * find the matching path extension and remove it
748 fib_path_ext_list_remove(&mt->mt_path_exts,
753 * re-resolve all the path-extensions with the new path-list
755 fib_path_ext_list_resolve(&mt->mt_path_exts,
758 mpls_tunnel_restack(mt);
761 return (fib_path_list_get_n_paths(mt->mt_path_list));
765 static clib_error_t *
766 vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
767 unformat_input_t * input,
768 vlib_cli_command_t * cmd)
770 unformat_input_t _line_input, * line_input = &_line_input;
771 vnet_main_t * vnm = vnet_get_main();
772 u8 is_del = 0, l2_only = 0, is_multicast =0;
773 fib_route_path_t rpath, *rpaths = NULL;
774 mpls_label_t out_label = MPLS_LABEL_INVALID;
776 clib_error_t *error = NULL;
778 memset(&rpath, 0, sizeof(rpath));
780 /* Get a line of input. */
781 if (! unformat_user (input, unformat_line_input, line_input))
784 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
786 if (unformat (line_input, "del %U",
787 unformat_vnet_sw_interface, vnm,
790 else if (unformat (line_input, "add"))
792 else if (unformat (line_input, "out-label %U",
793 unformat_mpls_unicast_label, &out_label))
795 vec_add1(rpath.frp_label_stack, out_label);
797 else if (unformat (line_input, "via %U %U",
798 unformat_ip4_address,
800 unformat_vnet_sw_interface, vnm,
801 &rpath.frp_sw_if_index))
803 rpath.frp_weight = 1;
804 rpath.frp_proto = FIB_PROTOCOL_IP4;
807 else if (unformat (line_input, "via %U %U",
808 unformat_ip6_address,
810 unformat_vnet_sw_interface, vnm,
811 &rpath.frp_sw_if_index))
813 rpath.frp_weight = 1;
814 rpath.frp_proto = FIB_PROTOCOL_IP6;
816 else if (unformat (line_input, "via %U",
817 unformat_ip6_address,
818 &rpath.frp_addr.ip6))
820 rpath.frp_fib_index = 0;
821 rpath.frp_weight = 1;
822 rpath.frp_sw_if_index = ~0;
823 rpath.frp_proto = FIB_PROTOCOL_IP6;
825 else if (unformat (line_input, "via %U",
826 unformat_ip4_address,
827 &rpath.frp_addr.ip4))
829 rpath.frp_fib_index = 0;
830 rpath.frp_weight = 1;
831 rpath.frp_sw_if_index = ~0;
832 rpath.frp_proto = FIB_PROTOCOL_IP4;
834 else if (unformat (line_input, "l2-only"))
836 else if (unformat (line_input, "multicast"))
840 error = clib_error_return (0, "unknown input '%U'",
841 format_unformat_error, line_input);
848 vnet_mpls_tunnel_del(sw_if_index);
852 if (0 == vec_len(rpath.frp_label_stack))
854 error = clib_error_return (0, "No Output Labels '%U'",
855 format_unformat_error, line_input);
859 vec_add1(rpaths, rpath);
860 sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
861 vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
866 unformat_free (line_input);
872 * This command create a uni-directional MPLS tunnel
875 * @cliexstart{create mpls tunnel}
876 * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
879 VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
880 .path = "mpls tunnel",
882 "mpls tunnel via [addr] [interface] [out-labels]",
883 .function = vnet_create_mpls_tunnel_command_fn,
887 format_mpls_tunnel (u8 * s, va_list * args)
889 mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
890 mpls_tunnel_attribute_t attr;
892 s = format(s, "mpls_tunnel%d: sw_if_index:%d hw_if_index:%d",
893 mt - mpls_tunnel_pool,
896 if (MPLS_TUNNEL_FLAG_NONE != mt->mt_flags) {
897 s = format(s, " \n flags:");
898 FOR_EACH_MPLS_TUNNEL_ATTRIBUTE(attr) {
899 if ((1<<attr) & mt->mt_flags) {
900 s = format (s, "%s,", mpls_tunnel_attribute_names[attr]);
904 s = format(s, "\n via:\n");
905 s = fib_path_list_format(mt->mt_path_list, s);
906 s = format(s, "%U", format_fib_path_ext_list, &mt->mt_path_exts);
912 static clib_error_t *
913 show_mpls_tunnel_command_fn (vlib_main_t * vm,
914 unformat_input_t * input,
915 vlib_cli_command_t * cmd)
920 if (pool_elts (mpls_tunnel_pool) == 0)
921 vlib_cli_output (vm, "No MPLS tunnels configured...");
923 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
925 if (unformat (input, "%d", &mti))
933 pool_foreach (mt, mpls_tunnel_pool,
935 vlib_cli_output (vm, "[@%d] %U",
936 mt - mpls_tunnel_pool,
937 format_mpls_tunnel, mt);
942 if (pool_is_free_index(mpls_tunnel_pool, mti))
943 return clib_error_return (0, "Not atunnel index %d", mti);
945 mt = pool_elt_at_index(mpls_tunnel_pool, mti);
947 vlib_cli_output (vm, "[@%d] %U",
948 mt - mpls_tunnel_pool,
949 format_mpls_tunnel, mt);
956 * This command to show MPLS tunnels
959 * @cliexstart{sh mpls tunnel 2}
960 * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
964 * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
965 * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
967 * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
970 VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
971 .path = "show mpls tunnel",
972 .function = show_mpls_tunnel_command_fn,
975 static mpls_tunnel_t *
976 mpls_tunnel_from_fib_node (fib_node_t *node)
979 ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
981 return ((mpls_tunnel_t*) (((char*)node) -
982 STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
986 * Function definition to backwalk a FIB node
988 static fib_node_back_walk_rc_t
989 mpls_tunnel_back_walk (fib_node_t *node,
990 fib_node_back_walk_ctx_t *ctx)
992 mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
994 return (FIB_NODE_BACK_WALK_CONTINUE);
998 * Function definition to get a FIB node from its index
1001 mpls_tunnel_fib_node_get (fib_node_index_t index)
1005 mt = pool_elt_at_index(mpls_tunnel_pool, index);
1007 return (&mt->mt_node);
1011 * Function definition to inform the FIB node that its last lock has gone.
1014 mpls_tunnel_last_lock_gone (fib_node_t *node)
1017 * The MPLS MPLS tunnel is a root of the graph. As such
1018 * it never has children and thus is never locked.
1024 * Virtual function table registered by MPLS MPLS tunnels
1025 * for participation in the FIB object graph.
1027 const static fib_node_vft_t mpls_vft = {
1028 .fnv_get = mpls_tunnel_fib_node_get,
1029 .fnv_last_lock = mpls_tunnel_last_lock_gone,
1030 .fnv_back_walk = mpls_tunnel_back_walk,
1033 static clib_error_t *
1034 mpls_tunnel_init (vlib_main_t *vm)
1036 fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
1040 VLIB_INIT_FUNCTION(mpls_tunnel_init);