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,
127 * we don't want IP TTL decrements for packets hitting the MPLS labels
128 * we stack on, since the IP TTL decrement is done by the adj
130 path_ext->fpe_mpls_flags |= FIB_PATH_EXT_MPLS_FLAG_NO_IP_TTL_DECR;
133 * found a matching extension. stack it to obtain the forwarding
134 * info for this path.
136 ctx->next_hops = fib_path_ext_stack(path_ext,
141 return (FIB_PATH_LIST_WALK_CONTINUE);
145 mpls_tunnel_mk_lb (mpls_tunnel_t *mt,
147 fib_forward_chain_type_t fct,
150 dpo_proto_t lb_proto;
153 * If the entry has path extensions then we construct a load-balance
154 * by stacking the extensions on the forwarding chains of the paths.
155 * Otherwise we use the load-balance of the path-list
157 mpls_tunnel_collect_forwarding_ctx_t ctx = {
164 * As an optimisation we allocate the vector of next-hops to be sized
165 * equal to the maximum nuber of paths we will need, which is also the
166 * most likely number we will need, since in most cases the paths are 'up'.
168 vec_validate(ctx.next_hops, fib_path_list_get_n_paths(mt->mt_path_list));
169 vec_reset_length(ctx.next_hops);
171 lb_proto = fib_forw_chain_type_to_dpo_proto(fct);
173 fib_path_list_walk(mt->mt_path_list,
174 mpls_tunnel_collect_forwarding,
177 if (!dpo_id_is_valid(dpo_lb))
182 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
187 replicate_create(0, lb_proto));
191 flow_hash_config_t fhc;
196 fhc = MPLS_FLOW_HASH_DEFAULT;
200 fhc = IP_FLOW_HASH_DEFAULT;
210 load_balance_create(0, lb_proto, fhc));
214 if (mt->mt_flags & MPLS_TUNNEL_FLAG_MCAST)
219 replicate_multipath_update(dpo_lb, ctx.next_hops);
223 load_balance_multipath_update(dpo_lb,
225 LOAD_BALANCE_FLAG_NONE);
226 vec_free(ctx.next_hops);
233 * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
236 mpls_tunnel_stack (adj_index_t ai)
243 sw_if_index = adj->rewrite_header.sw_if_index;
245 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
251 * while we're stacking the adj, remove the tunnel from the child list
252 * of the path list. this breaks a circular dependency of walk updates
253 * where the create of adjacencies in the children can lead to walks
254 * that get back here.
256 fib_path_list_lock(mt->mt_path_list);
258 fib_path_list_child_remove(mt->mt_path_list,
259 mt->mt_sibling_index);
262 * Construct the DPO (load-balance or replicate) that we can stack
263 * the tunnel's midchain on
265 if (vnet_hw_interface_get_flags(vnet_get_main(),
266 mt->mt_hw_if_index) &
267 VNET_HW_INTERFACE_FLAG_LINK_UP)
269 dpo_id_t dpo = DPO_INVALID;
271 mpls_tunnel_mk_lb(mt,
273 fib_forw_chain_type_from_link_type(
274 adj_get_link_type(ai)),
277 adj_nbr_midchain_stack(ai, &dpo);
282 adj_nbr_midchain_unstack(ai);
285 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
286 FIB_NODE_TYPE_MPLS_TUNNEL,
287 mt - mpls_tunnel_pool);
289 fib_path_list_unlock(mt->mt_path_list);
293 * @brief Call back when restacking all adjacencies on a MPLS interface
296 mpls_adj_walk_cb (adj_index_t ai,
299 mpls_tunnel_stack(ai);
301 return (ADJ_WALK_RC_CONTINUE);
305 mpls_tunnel_restack (mpls_tunnel_t *mt)
307 fib_protocol_t proto;
310 * walk all the adjacencies on the MPLS interface and restack them
312 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
315 * Stack a load-balance that drops, whilst we have no paths
317 vnet_hw_interface_t * hi;
318 dpo_id_t dpo = DPO_INVALID;
320 mpls_tunnel_mk_lb(mt,
322 FIB_FORW_CHAIN_TYPE_ETHERNET,
325 hi = vnet_get_hw_interface(vnet_get_main(), mt->mt_hw_if_index);
326 dpo_stack_from_node(hi->tx_node_index,
333 FOR_EACH_FIB_PROTOCOL(proto)
335 adj_nbr_walk(mt->mt_sw_if_index,
343 static clib_error_t *
344 mpls_tunnel_admin_up_down (vnet_main_t * vnm,
348 vnet_hw_interface_t * hi;
351 hi = vnet_get_hw_interface (vnm, hw_if_index);
353 mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
358 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
359 vnet_hw_interface_set_flags (vnm, hw_if_index,
360 VNET_HW_INTERFACE_FLAG_LINK_UP);
362 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
364 mpls_tunnel_restack(mt);
370 * @brief Fixup the adj rewrite post encap. This is a no-op since the
371 * rewrite is a stack of labels.
374 mpls_tunnel_fixup (vlib_main_t *vm,
380 * A no-op w.r.t. the header. but reset the 'have we pushed any
381 * MPLS labels onto the packet' flag. That way when we enter the
382 * tunnel we'll get a TTL set to 255
384 vnet_buffer(b0)->mpls.first = 0;
388 mpls_tunnel_update_adj (vnet_main_t * vnm,
394 ASSERT(ADJ_INDEX_INVALID != ai);
398 switch (adj->lookup_next_index)
400 case IP_LOOKUP_NEXT_ARP:
401 case IP_LOOKUP_NEXT_GLEAN:
402 adj_nbr_midchain_update_rewrite(ai, mpls_tunnel_fixup,
405 mpls_tunnel_build_rewrite_i());
407 case IP_LOOKUP_NEXT_MCAST:
409 * Construct a partial rewrite from the known ethernet mcast dest MAC
410 * There's no MAC fixup, so the last 2 parameters are 0
412 adj_mcast_midchain_update_rewrite(ai, mpls_tunnel_fixup,
415 mpls_tunnel_build_rewrite_i(),
419 case IP_LOOKUP_NEXT_DROP:
420 case IP_LOOKUP_NEXT_PUNT:
421 case IP_LOOKUP_NEXT_LOCAL:
422 case IP_LOOKUP_NEXT_REWRITE:
423 case IP_LOOKUP_NEXT_MIDCHAIN:
424 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
425 case IP_LOOKUP_NEXT_ICMP_ERROR:
426 case IP_LOOKUP_N_NEXT:
431 mpls_tunnel_stack(ai);
435 format_mpls_tunnel_name (u8 * s, va_list * args)
437 u32 dev_instance = va_arg (*args, u32);
438 return format (s, "mpls-tunnel%d", dev_instance);
442 format_mpls_tunnel_device (u8 * s, va_list * args)
444 u32 dev_instance = va_arg (*args, u32);
445 CLIB_UNUSED (int verbose) = va_arg (*args, int);
447 return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
451 * @brief Packet trace structure
453 typedef struct mpls_tunnel_trace_t_
456 * Tunnel-id / index in tunnel vector
459 } mpls_tunnel_trace_t;
462 format_mpls_tunnel_tx_trace (u8 * s,
465 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
466 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
467 mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
469 s = format (s, "MPLS: tunnel %d", t->tunnel_id);
474 * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
477 mpls_tunnel_tx (vlib_main_t * vm,
478 vlib_node_runtime_t * node,
479 vlib_frame_t * frame)
482 u32 * from, * to_next, n_left_from, n_left_to_next;
483 vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
484 const mpls_tunnel_t *mt;
486 mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
488 /* Vector of buffer / pkt indices we're supposed to process */
489 from = vlib_frame_vector_args (frame);
491 /* Number of buffers / pkts */
492 n_left_from = frame->n_vectors;
494 /* Speculatively send the first buffer to the last disposition we used */
495 next_index = node->cached_next_index;
497 while (n_left_from > 0)
499 /* set up to enqueue to our disposition with index = next_index */
500 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
505 while (n_left_from > 0 && n_left_to_next > 0)
517 b0 = vlib_get_buffer(vm, bi0);
519 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_lb.dpoi_index;
520 /* since we are coming out of the L2 world, where the vlib_buffer
521 * union is used for other things, make sure it is clean for
524 vnet_buffer(b0)->mpls.first = 0;
526 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
528 mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
530 tr->tunnel_id = rd->dev_instance;
533 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
534 to_next, n_left_to_next,
535 bi0, mt->mt_l2_lb.dpoi_next_node);
538 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
541 return frame->n_vectors;
544 VNET_DEVICE_CLASS (mpls_tunnel_class) = {
545 .name = "MPLS tunnel device",
546 .format_device_name = format_mpls_tunnel_name,
547 .format_device = format_mpls_tunnel_device,
548 .format_tx_trace = format_mpls_tunnel_tx_trace,
549 .tx_function = mpls_tunnel_tx,
550 .admin_up_down_function = mpls_tunnel_admin_up_down,
553 VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
554 .name = "MPLS-Tunnel",
555 .update_adjacency = mpls_tunnel_update_adj,
556 .build_rewrite = mpls_tunnel_build_rewrite,
557 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
560 const mpls_tunnel_t *
561 mpls_tunnel_get (u32 mti)
563 return (pool_elt_at_index(mpls_tunnel_pool, mti));
567 * @brief Walk all the MPLS tunnels
570 mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
575 pool_foreach_index(mti, mpls_tunnel_pool,
582 vnet_mpls_tunnel_del (u32 sw_if_index)
586 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
591 if (FIB_NODE_INDEX_INVALID != mt->mt_path_list)
592 fib_path_list_child_remove(mt->mt_path_list,
593 mt->mt_sibling_index);
594 dpo_reset(&mt->mt_l2_lb);
596 vec_add1 (mpls_tunnel_free_hw_if_indices, 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 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, or re=use and old, tunnel HW interface
626 if (vec_len (mpls_tunnel_free_hw_if_indices) > 0)
629 mpls_tunnel_free_hw_if_indices[vec_len(mpls_tunnel_free_hw_if_indices)-1];
630 _vec_len (mpls_tunnel_free_hw_if_indices) -= 1;
631 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
632 hi->hw_instance = mti;
633 hi->dev_instance = mti;
637 mt->mt_hw_if_index = vnet_register_interface(
639 mpls_tunnel_class.index,
641 mpls_tunnel_hw_interface_class.index,
643 hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
647 * Add the new tunnel to the tunnel DB - key:SW if index
649 mt->mt_sw_if_index = hi->sw_if_index;
650 vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
651 mpls_tunnel_db[mt->mt_sw_if_index] = mti;
653 return (mt->mt_sw_if_index);
657 vnet_mpls_tunnel_path_add (u32 sw_if_index,
658 fib_route_path_t *rpaths)
663 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
668 mti = mt - mpls_tunnel_pool;
671 * construct a path-list from the path provided
673 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
675 mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
676 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
677 FIB_NODE_TYPE_MPLS_TUNNEL,
682 fib_node_index_t old_pl_index;
684 old_pl_index = mt->mt_path_list;
687 fib_path_list_copy_and_path_add(old_pl_index,
688 FIB_PATH_LIST_FLAG_SHARED,
691 fib_path_list_child_remove(old_pl_index,
692 mt->mt_sibling_index);
693 mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
694 FIB_NODE_TYPE_MPLS_TUNNEL,
697 * re-resolve all the path-extensions with the new path-list
699 fib_path_ext_list_resolve(&mt->mt_path_exts, mt->mt_path_list);
701 fib_path_ext_list_insert(&mt->mt_path_exts,
705 mpls_tunnel_restack(mt);
709 vnet_mpls_tunnel_path_remove (u32 sw_if_index,
710 fib_route_path_t *rpaths)
715 mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
720 mti = mt - mpls_tunnel_pool;
723 * construct a path-list from the path provided
725 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
727 /* can't remove a path if we have onoe */
732 fib_node_index_t old_pl_index;
734 old_pl_index = mt->mt_path_list;
737 fib_path_list_copy_and_path_remove(old_pl_index,
738 FIB_PATH_LIST_FLAG_SHARED,
741 fib_path_list_child_remove(old_pl_index,
742 mt->mt_sibling_index);
744 if (FIB_NODE_INDEX_INVALID == mt->mt_path_list)
751 mt->mt_sibling_index =
752 fib_path_list_child_add(mt->mt_path_list,
753 FIB_NODE_TYPE_MPLS_TUNNEL,
757 * find the matching path extension and remove it
759 fib_path_ext_list_remove(&mt->mt_path_exts,
764 * re-resolve all the path-extensions with the new path-list
766 fib_path_ext_list_resolve(&mt->mt_path_exts,
769 mpls_tunnel_restack(mt);
772 return (fib_path_list_get_n_paths(mt->mt_path_list));
776 static clib_error_t *
777 vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
778 unformat_input_t * input,
779 vlib_cli_command_t * cmd)
781 unformat_input_t _line_input, * line_input = &_line_input;
782 vnet_main_t * vnm = vnet_get_main();
783 u8 is_del = 0, l2_only = 0, is_multicast =0;
784 fib_route_path_t rpath, *rpaths = NULL;
785 u32 sw_if_index = ~0, payload_proto;
786 clib_error_t *error = NULL;
788 memset(&rpath, 0, sizeof(rpath));
789 payload_proto = DPO_PROTO_MPLS;
791 /* Get a line of input. */
792 if (! unformat_user (input, unformat_line_input, line_input))
795 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
797 if (unformat (line_input, "del %U",
798 unformat_vnet_sw_interface, vnm,
801 else if (unformat (line_input, "add %U",
802 unformat_vnet_sw_interface, vnm,
805 else if (unformat (line_input, "add"))
807 else if (unformat (line_input, "l2-only"))
809 else if (unformat (line_input, "multicast"))
811 else if (unformat (line_input, "via %U",
812 unformat_fib_route_path,
813 &rpath, &payload_proto))
814 vec_add1(rpaths, rpath);
817 error = clib_error_return (0, "unknown input '%U'",
818 format_unformat_error, line_input);
825 if (!vnet_mpls_tunnel_path_remove(sw_if_index, rpaths))
827 vnet_mpls_tunnel_del(sw_if_index);
832 if (0 == vec_len(rpath.frp_label_stack))
834 error = clib_error_return (0, "No Output Labels '%U'",
835 format_unformat_error, line_input);
839 if (~0 == sw_if_index)
841 sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
843 vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
848 unformat_free (line_input);
854 * This command create a uni-directional MPLS tunnel
857 * @cliexstart{create mpls tunnel}
858 * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
861 VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
862 .path = "mpls tunnel",
864 "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>]",
865 .function = vnet_create_mpls_tunnel_command_fn,
869 format_mpls_tunnel (u8 * s, va_list * args)
871 mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
872 mpls_tunnel_attribute_t attr;
874 s = format(s, "mpls_tunnel%d: sw_if_index:%d hw_if_index:%d",
875 mt - mpls_tunnel_pool,
878 if (MPLS_TUNNEL_FLAG_NONE != mt->mt_flags) {
879 s = format(s, " \n flags:");
880 FOR_EACH_MPLS_TUNNEL_ATTRIBUTE(attr) {
881 if ((1<<attr) & mt->mt_flags) {
882 s = format (s, "%s,", mpls_tunnel_attribute_names[attr]);
886 s = format(s, "\n via:\n");
887 s = fib_path_list_format(mt->mt_path_list, s);
888 s = format(s, "%U", format_fib_path_ext_list, &mt->mt_path_exts);
891 if (mt->mt_flags & MPLS_TUNNEL_FLAG_L2)
893 s = format(s, " forwarding: %U\n",
894 format_fib_forw_chain_type,
895 FIB_FORW_CHAIN_TYPE_ETHERNET);
896 s = format(s, " %U\n", format_dpo_id, &mt->mt_l2_lb, 2);
902 static clib_error_t *
903 show_mpls_tunnel_command_fn (vlib_main_t * vm,
904 unformat_input_t * input,
905 vlib_cli_command_t * cmd)
910 if (pool_elts (mpls_tunnel_pool) == 0)
911 vlib_cli_output (vm, "No MPLS tunnels configured...");
913 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
915 if (unformat (input, "%d", &mti))
923 pool_foreach (mt, mpls_tunnel_pool,
925 vlib_cli_output (vm, "[@%d] %U",
926 mt - mpls_tunnel_pool,
927 format_mpls_tunnel, mt);
932 if (pool_is_free_index(mpls_tunnel_pool, mti))
933 return clib_error_return (0, "Not atunnel index %d", mti);
935 mt = pool_elt_at_index(mpls_tunnel_pool, mti);
937 vlib_cli_output (vm, "[@%d] %U",
938 mt - mpls_tunnel_pool,
939 format_mpls_tunnel, mt);
946 * This command to show MPLS tunnels
949 * @cliexstart{sh mpls tunnel 2}
950 * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
954 * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
955 * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
957 * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
960 VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
961 .path = "show mpls tunnel",
962 .function = show_mpls_tunnel_command_fn,
965 static mpls_tunnel_t *
966 mpls_tunnel_from_fib_node (fib_node_t *node)
968 ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
969 return ((mpls_tunnel_t*) (((char*)node) -
970 STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
974 * Function definition to backwalk a FIB node
976 static fib_node_back_walk_rc_t
977 mpls_tunnel_back_walk (fib_node_t *node,
978 fib_node_back_walk_ctx_t *ctx)
980 mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
982 return (FIB_NODE_BACK_WALK_CONTINUE);
986 * Function definition to get a FIB node from its index
989 mpls_tunnel_fib_node_get (fib_node_index_t index)
993 mt = pool_elt_at_index(mpls_tunnel_pool, index);
995 return (&mt->mt_node);
999 * Function definition to inform the FIB node that its last lock has gone.
1002 mpls_tunnel_last_lock_gone (fib_node_t *node)
1005 * The MPLS MPLS tunnel is a root of the graph. As such
1006 * it never has children and thus is never locked.
1012 * Virtual function table registered by MPLS MPLS tunnels
1013 * for participation in the FIB object graph.
1015 const static fib_node_vft_t mpls_vft = {
1016 .fnv_get = mpls_tunnel_fib_node_get,
1017 .fnv_last_lock = mpls_tunnel_last_lock_gone,
1018 .fnv_back_walk = mpls_tunnel_back_walk,
1021 static clib_error_t *
1022 mpls_tunnel_init (vlib_main_t *vm)
1024 fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
1028 VLIB_INIT_FUNCTION(mpls_tunnel_init);