src/vnet/fib/mpls_fib.c - fdio/vpp - Gitiles

 /*
  * mpls_fib.h: The Label/MPLS FIB
  *
  * Copyright (c) 2012 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 /**
  * An MPLS_FIB table;
  *
  * The entries in the table are programmed wtih one or more MOIs. These MOIs
  * may result in different forwarding actions for end-of-stack (EOS) and non-EOS
  * packets. Whether the two actions are the same more often than they are
  * different, or vice versa, is a function of the deployment in which the router
  * is used and thus not predictable.
  * The desgin choice to make with an MPLS_FIB table is:
  *  1 - 20 bit key: label only.
  *      When the EOS and non-EOS actions differ the result is a 'EOS-choice' object.
  *  2 - 21 bit key: label and EOS-bit.
  *      The result is then the specific action based on EOS-bit.
  *
  * 20 bit key:
  *   Advantages:
  *    - lower memory overhead, since there are few DB entries.
  *   Disadvantages:
  *    - slower DP performance in the case the chains differ, as more objects are
  *      encounterd in the switch path
  *
  * 21 bit key:
  *   Advantages:
  *    - faster DP performance
  *   Disadvantages
  *    - increased memory footprint.
  *
  * Switching between schemes based on observed/measured action similarity is not
  * considered on the grounds of complexity and flip-flopping.
  *
  * VPP mantra - favour performance over memory. We choose a 21 bit key.
  */

 #include <vnet/fib/fib_table.h>
 #include <vnet/fib/mpls_fib.h>
 #include <vnet/dpo/load_balance.h>
 #include <vnet/dpo/drop_dpo.h>
 #include <vnet/dpo/punt_dpo.h>
 #include <vnet/dpo/lookup_dpo.h>
 #include <vnet/mpls/mpls.h>

 /**
  * All lookups in an MPLS_FIB table must result in a DPO of type load-balance.
  * This is the default result which links to drop
  */
 static index_t mpls_fib_drop_dpo_index = INDEX_INVALID;

 static inline u32
 mpls_fib_entry_mk_key (mpls_label_t label,
 		       mpls_eos_bit_t eos)
 {
     ASSERT(eos <= 1);
     return (label << 1 | eos);
 }

 u32
 mpls_fib_index_from_table_id (u32 table_id)
 {
     mpls_main_t *mm = &mpls_main;
     uword * p;

     p = hash_get (mm->fib_index_by_table_id, table_id);
     if (!p)
 	return FIB_NODE_INDEX_INVALID;

     return p[0];
 }

 static u32
 mpls_fib_create_with_table_id (u32 table_id)
 {
     dpo_id_t dpo = DPO_INVALID;
     fib_table_t *fib_table;
     mpls_eos_bit_t eos;
     mpls_fib_t *mf;
     int i;

     pool_get_aligned(mpls_main.fibs, fib_table, CLIB_CACHE_LINE_BYTES);
     pool_get_aligned(mpls_main.mpls_fibs, mf, CLIB_CACHE_LINE_BYTES);

     ASSERT((fib_table - mpls_main.fibs) ==
            (mf - mpls_main.mpls_fibs));

     memset(fib_table, 0, sizeof(*fib_table));

     fib_table->ft_proto = FIB_PROTOCOL_MPLS;
     fib_table->ft_index = (fib_table - mpls_main.fibs);

     hash_set (mpls_main.fib_index_by_table_id, table_id, fib_table->ft_index);

     fib_table->ft_table_id = table_id;
     fib_table->ft_flow_hash_config = MPLS_FLOW_HASH_DEFAULT;

     fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_MPLS);

     if (INDEX_INVALID == mpls_fib_drop_dpo_index)
     {
 	mpls_fib_drop_dpo_index = load_balance_create(1, DPO_PROTO_MPLS, 0);
 	load_balance_set_bucket(mpls_fib_drop_dpo_index,
 				0,
                                 drop_dpo_get(DPO_PROTO_MPLS));
     }

     mf->mf_entries = hash_create(0, sizeof(fib_node_index_t));
     for (i = 0; i < MPLS_FIB_DB_SIZE; i++)
     {
 	/*
 	 * initialise each DPO in the data-path lookup table
 	 * to be the special MPLS drop
 	 */
 	mf->mf_lbs[i] = mpls_fib_drop_dpo_index;
     }

     /*
      * non-default forwarding for the special labels.
      */
     fib_prefix_t prefix = {
 	.fp_proto = FIB_PROTOCOL_MPLS,
 	.fp_payload_proto = DPO_PROTO_MPLS,
     };

     /*
      * PUNT the router alert, both EOS and non-eos
      */
     prefix.fp_label = MPLS_IETF_ROUTER_ALERT_LABEL;
     FOR_EACH_MPLS_EOS_BIT(eos)
     {
 	prefix.fp_eos = eos;
         fib_table_entry_special_dpo_add(fib_table->ft_index,
 					&prefix,
 					FIB_SOURCE_SPECIAL,
 					FIB_ENTRY_FLAG_EXCLUSIVE,
 					punt_dpo_get(DPO_PROTO_MPLS));
     }

     /*
      * IPv4 explicit NULL EOS lookup in the interface's IPv4 table
      */
     prefix.fp_label = MPLS_IETF_IPV4_EXPLICIT_NULL_LABEL;
     prefix.fp_payload_proto = DPO_PROTO_IP4;
     prefix.fp_eos = MPLS_EOS;

     lookup_dpo_add_or_lock_w_fib_index(0, // unused
                                        DPO_PROTO_IP4,
                                        LOOKUP_UNICAST,
                                        LOOKUP_INPUT_DST_ADDR,
                                        LOOKUP_TABLE_FROM_INPUT_INTERFACE,
                                        &dpo);
     fib_table_entry_special_dpo_add(fib_table->ft_index,
 				    &prefix,
 				    FIB_SOURCE_SPECIAL,
 				    FIB_ENTRY_FLAG_EXCLUSIVE,
                                     &dpo);

     prefix.fp_payload_proto = DPO_PROTO_MPLS;
     prefix.fp_eos = MPLS_NON_EOS;

     lookup_dpo_add_or_lock_w_fib_index(0, //unsued
                                        DPO_PROTO_MPLS,
                                        LOOKUP_UNICAST,
                                        LOOKUP_INPUT_DST_ADDR,
                                        LOOKUP_TABLE_FROM_INPUT_INTERFACE,
                                        &dpo);
     fib_table_entry_special_dpo_add(fib_table->ft_index,
 				    &prefix,
 				    FIB_SOURCE_SPECIAL,
 				    FIB_ENTRY_FLAG_EXCLUSIVE,
                                     &dpo);

     /*
      * IPv6 explicit NULL EOS lookup in the interface's IPv6 table
      */
     prefix.fp_label = MPLS_IETF_IPV6_EXPLICIT_NULL_LABEL;
     prefix.fp_payload_proto = DPO_PROTO_IP6;
     prefix.fp_eos = MPLS_EOS;

     lookup_dpo_add_or_lock_w_fib_index(0, //unused
                                        DPO_PROTO_IP6,
                                        LOOKUP_UNICAST,
                                        LOOKUP_INPUT_DST_ADDR,
                                        LOOKUP_TABLE_FROM_INPUT_INTERFACE,
                                        &dpo);
     fib_table_entry_special_dpo_add(fib_table->ft_index,
 				    &prefix,
 				    FIB_SOURCE_SPECIAL,
 				    FIB_ENTRY_FLAG_EXCLUSIVE,
                                     &dpo);

     prefix.fp_payload_proto = DPO_PROTO_MPLS;
     prefix.fp_eos = MPLS_NON_EOS;
     lookup_dpo_add_or_lock_w_fib_index(0, // unsued
                                        DPO_PROTO_MPLS,
                                        LOOKUP_UNICAST,
                                        LOOKUP_INPUT_DST_ADDR,
                                        LOOKUP_TABLE_FROM_INPUT_INTERFACE,
                                        &dpo);
     fib_table_entry_special_dpo_add(fib_table->ft_index,
 				    &prefix,
 				    FIB_SOURCE_SPECIAL,
 				    FIB_ENTRY_FLAG_EXCLUSIVE,
                                     &dpo);

     return (fib_table->ft_index);
 }

 u32
 mpls_fib_table_find_or_create_and_lock (u32 table_id)
 {
     u32 index;

     index = mpls_fib_index_from_table_id(table_id);
     if (~0 == index)
 	return mpls_fib_create_with_table_id(table_id);

     fib_table_lock(index, FIB_PROTOCOL_MPLS);

     return (index);
 }
 u32
 mpls_fib_table_create_and_lock (void)
 {
     return (mpls_fib_create_with_table_id(~0));
 }

 void
 mpls_fib_table_destroy (u32 fib_index)
 {
     fib_table_t *fib_table = pool_elt_at_index(mpls_main.fibs, fib_index);
     mpls_fib_t *mf = pool_elt_at_index(mpls_main.mpls_fibs, fib_index);
     fib_prefix_t prefix = {
 	.fp_proto = FIB_PROTOCOL_MPLS,
     };
     mpls_label_t special_labels[] = {
 	MPLS_IETF_ROUTER_ALERT_LABEL,
 	MPLS_IETF_IPV6_EXPLICIT_NULL_LABEL,
 	MPLS_IETF_IPV4_EXPLICIT_NULL_LABEL,
     };
     mpls_eos_bit_t eos;
     u32 ii;

     for (ii = 0; ii < ARRAY_LEN(special_labels); ii++)
     {
 	FOR_EACH_MPLS_EOS_BIT(eos)
 	{
 	    prefix.fp_label = special_labels[ii];
 	    prefix.fp_eos   = eos;

 	    fib_table_entry_delete(fib_table->ft_index,
 				   &prefix,
 				   FIB_SOURCE_SPECIAL);
 	}
     }
     if (~0 != fib_table->ft_table_id)
     {
 	hash_unset(mpls_main.fib_index_by_table_id,
 		   fib_table->ft_table_id);
     }
     hash_free(mf->mf_entries);

     pool_put(mpls_main.mpls_fibs, mf);
     pool_put(mpls_main.fibs, fib_table);
 }

 fib_node_index_t
 mpls_fib_table_lookup (const mpls_fib_t *mf,
 		       mpls_label_t label,
 		       mpls_eos_bit_t eos)
 {
     uword *p;

     p = hash_get(mf->mf_entries, mpls_fib_entry_mk_key(label, eos));

     if (NULL == p)
 	return FIB_NODE_INDEX_INVALID;

     return p[0];
 }

 void
 mpls_fib_table_entry_insert (mpls_fib_t *mf,
 			     mpls_label_t label,
 			     mpls_eos_bit_t eos,
 			     fib_node_index_t lfei)
 {
     hash_set(mf->mf_entries, mpls_fib_entry_mk_key(label, eos), lfei);
 }

 void
 mpls_fib_table_entry_remove (mpls_fib_t *mf,
 			     mpls_label_t label,
 			     mpls_eos_bit_t eos)
 {
     hash_unset(mf->mf_entries, mpls_fib_entry_mk_key(label, eos));
 }

 void
 mpls_fib_forwarding_table_update (mpls_fib_t *mf,
 				  mpls_label_t label,
 				  mpls_eos_bit_t eos,
 				  const dpo_id_t *dpo)
 {
     mpls_label_t key;

     ASSERT((DPO_LOAD_BALANCE == dpo->dpoi_type) ||
            (DPO_REPLICATE == dpo->dpoi_type));
     if (CLIB_DEBUG > 0)
     {
         if (DPO_REPLICATE == dpo->dpoi_type)
             ASSERT(dpo->dpoi_index & MPLS_IS_REPLICATE);
         if (DPO_LOAD_BALANCE == dpo->dpoi_type)
             ASSERT(!(dpo->dpoi_index & MPLS_IS_REPLICATE));
     }
     key = mpls_fib_entry_mk_key(label, eos);

     mf->mf_lbs[key] = dpo->dpoi_index;
 }

 void
 mpls_fib_forwarding_table_reset (mpls_fib_t *mf,
 				 mpls_label_t label,
 				 mpls_eos_bit_t eos)
 {
     mpls_label_t key;

     key = mpls_fib_entry_mk_key(label, eos);

     mf->mf_lbs[key] = mpls_fib_drop_dpo_index;
 }

 void
 mpls_fib_table_walk (mpls_fib_t *mpls_fib,
                      fib_table_walk_fn_t fn,
                      void *ctx)
 {
     fib_node_index_t lfei;
     mpls_label_t key;

     hash_foreach(key, lfei, mpls_fib->mf_entries,
     ({
 	fn(lfei, ctx);
     }));
 }

 static void
 mpls_fib_table_show_all (const mpls_fib_t *mpls_fib,
 			 vlib_main_t * vm)
 {
     fib_node_index_t lfei, *lfeip, *lfeis = NULL;
     mpls_label_t key;

     hash_foreach(key, lfei, mpls_fib->mf_entries,
     ({
 	vec_add1(lfeis, lfei);
     }));

     vec_sort_with_function(lfeis, fib_entry_cmp_for_sort);

     vec_foreach(lfeip, lfeis)
     {
 	vlib_cli_output (vm, "%U",
 			 format_fib_entry, *lfeip,
 			 FIB_ENTRY_FORMAT_DETAIL);
     }
     vec_free(lfeis);
 }

 static void
 mpls_fib_table_show_one (const mpls_fib_t *mpls_fib,
 			 mpls_label_t label,
 			 vlib_main_t * vm)
 {
     fib_node_index_t lfei;
     mpls_eos_bit_t eos;

     FOR_EACH_MPLS_EOS_BIT(eos)
     {
 	lfei = mpls_fib_table_lookup(mpls_fib, label, eos);

 	if (FIB_NODE_INDEX_INVALID != lfei)
 	{
 	    vlib_cli_output (vm, "%U",
 			     format_fib_entry, lfei, FIB_ENTRY_FORMAT_DETAIL);
 	}
     }
 }

 static clib_error_t *
 mpls_fib_show (vlib_main_t * vm,
 	       unformat_input_t * input,
 	       vlib_cli_command_t * cmd)
 {
     fib_table_t * fib_table;
     mpls_label_t label;
     int table_id;

     table_id = -1;
     label = MPLS_LABEL_INVALID;

     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
 	/* if (unformat (input, "brief") || unformat (input, "summary") */
 	/*     || unformat (input, "sum")) */
 	/*     verbose = 0; */

 	if (unformat (input, "%d", &label))
 	    continue;
 	else if (unformat (input, "table %d", &table_id))
 	    ;
 	else
 	    break;
     }

     pool_foreach (fib_table, mpls_main.fibs,
     ({
 	if (table_id >= 0 && table_id != fib_table->ft_table_id)
 	    continue;

 	vlib_cli_output (vm, "%v, fib_index %d",
 			 fib_table->ft_desc, mpls_main.fibs - fib_table);

 	if (MPLS_LABEL_INVALID == label)
 	{
 	    mpls_fib_table_show_all(mpls_fib_get(fib_table->ft_index), vm);
 	}
 	else
 	{
 	    mpls_fib_table_show_one(mpls_fib_get(fib_table->ft_index), label, vm);
 	}
     }));

     return 0;
 }

 VLIB_CLI_COMMAND (mpls_fib_show_command, static) = {
     .path = "show mpls fib",
     .short_help = "show mpls fib [summary] [table <n>]",
     .function = mpls_fib_show,
 };
	/*
	* mpls_fib.h: The Label/MPLS FIB
	*
	* Copyright (c) 2012 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	/**
	* An MPLS_FIB table;
	*
	* The entries in the table are programmed wtih one or more MOIs. These MOIs
	* may result in different forwarding actions for end-of-stack (EOS) and non-EOS
	* packets. Whether the two actions are the same more often than they are
	* different, or vice versa, is a function of the deployment in which the router
	* is used and thus not predictable.
	* The desgin choice to make with an MPLS_FIB table is:
	* 1 - 20 bit key: label only.
	* When the EOS and non-EOS actions differ the result is a 'EOS-choice' object.
	* 2 - 21 bit key: label and EOS-bit.
	* The result is then the specific action based on EOS-bit.
	*
	* 20 bit key:
	* Advantages:
	* - lower memory overhead, since there are few DB entries.
	* Disadvantages:
	* - slower DP performance in the case the chains differ, as more objects are
	* encounterd in the switch path
	*
	* 21 bit key:
	* Advantages:
	* - faster DP performance
	* Disadvantages
	* - increased memory footprint.
	*
	* Switching between schemes based on observed/measured action similarity is not
	* considered on the grounds of complexity and flip-flopping.
	*
	* VPP mantra - favour performance over memory. We choose a 21 bit key.
	*/

	#include <vnet/fib/fib_table.h>
	#include <vnet/fib/mpls_fib.h>
	#include <vnet/dpo/load_balance.h>
	#include <vnet/dpo/drop_dpo.h>
	#include <vnet/dpo/punt_dpo.h>
	#include <vnet/dpo/lookup_dpo.h>
	#include <vnet/mpls/mpls.h>

	/**
	* All lookups in an MPLS_FIB table must result in a DPO of type load-balance.
	* This is the default result which links to drop
	*/
	static index_t mpls_fib_drop_dpo_index = INDEX_INVALID;

	static inline u32
	mpls_fib_entry_mk_key (mpls_label_t label,
	mpls_eos_bit_t eos)
	{
	ASSERT(eos <= 1);
	return (label << 1 \| eos);
	}

	u32
	mpls_fib_index_from_table_id (u32 table_id)
	{
	mpls_main_t *mm = &mpls_main;
	uword * p;

	p = hash_get (mm->fib_index_by_table_id, table_id);
	if (!p)
	return FIB_NODE_INDEX_INVALID;

	return p[0];
	}

	static u32
	mpls_fib_create_with_table_id (u32 table_id)
	{
	dpo_id_t dpo = DPO_INVALID;
	fib_table_t *fib_table;
	mpls_eos_bit_t eos;
	mpls_fib_t *mf;
	int i;

	pool_get_aligned(mpls_main.fibs, fib_table, CLIB_CACHE_LINE_BYTES);
	pool_get_aligned(mpls_main.mpls_fibs, mf, CLIB_CACHE_LINE_BYTES);

	ASSERT((fib_table - mpls_main.fibs) ==
	(mf - mpls_main.mpls_fibs));

	memset(fib_table, 0, sizeof(*fib_table));

	fib_table->ft_proto = FIB_PROTOCOL_MPLS;
	fib_table->ft_index = (fib_table - mpls_main.fibs);

	hash_set (mpls_main.fib_index_by_table_id, table_id, fib_table->ft_index);

	fib_table->ft_table_id = table_id;
	fib_table->ft_flow_hash_config = MPLS_FLOW_HASH_DEFAULT;

	fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_MPLS);

	if (INDEX_INVALID == mpls_fib_drop_dpo_index)
	{
	mpls_fib_drop_dpo_index = load_balance_create(1, DPO_PROTO_MPLS, 0);
	load_balance_set_bucket(mpls_fib_drop_dpo_index,
	0,
	drop_dpo_get(DPO_PROTO_MPLS));
	}

	mf->mf_entries = hash_create(0, sizeof(fib_node_index_t));
	for (i = 0; i < MPLS_FIB_DB_SIZE; i++)
	{
	/*
	* initialise each DPO in the data-path lookup table
	* to be the special MPLS drop
	*/
	mf->mf_lbs[i] = mpls_fib_drop_dpo_index;
	}

	/*
	* non-default forwarding for the special labels.
	*/
	fib_prefix_t prefix = {
	.fp_proto = FIB_PROTOCOL_MPLS,
	.fp_payload_proto = DPO_PROTO_MPLS,
	};

	/*
	* PUNT the router alert, both EOS and non-eos
	*/
	prefix.fp_label = MPLS_IETF_ROUTER_ALERT_LABEL;
	FOR_EACH_MPLS_EOS_BIT(eos)
	{
	prefix.fp_eos = eos;
	fib_table_entry_special_dpo_add(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL,
	FIB_ENTRY_FLAG_EXCLUSIVE,
	punt_dpo_get(DPO_PROTO_MPLS));
	}

	/*
	* IPv4 explicit NULL EOS lookup in the interface's IPv4 table
	*/
	prefix.fp_label = MPLS_IETF_IPV4_EXPLICIT_NULL_LABEL;
	prefix.fp_payload_proto = DPO_PROTO_IP4;
	prefix.fp_eos = MPLS_EOS;

	lookup_dpo_add_or_lock_w_fib_index(0, // unused
	DPO_PROTO_IP4,
	LOOKUP_UNICAST,
	LOOKUP_INPUT_DST_ADDR,
	LOOKUP_TABLE_FROM_INPUT_INTERFACE,
	&dpo);
	fib_table_entry_special_dpo_add(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL,
	FIB_ENTRY_FLAG_EXCLUSIVE,
	&dpo);

	prefix.fp_payload_proto = DPO_PROTO_MPLS;
	prefix.fp_eos = MPLS_NON_EOS;

	lookup_dpo_add_or_lock_w_fib_index(0, //unsued
	DPO_PROTO_MPLS,
	LOOKUP_UNICAST,
	LOOKUP_INPUT_DST_ADDR,
	LOOKUP_TABLE_FROM_INPUT_INTERFACE,
	&dpo);
	fib_table_entry_special_dpo_add(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL,
	FIB_ENTRY_FLAG_EXCLUSIVE,
	&dpo);

	/*
	* IPv6 explicit NULL EOS lookup in the interface's IPv6 table
	*/
	prefix.fp_label = MPLS_IETF_IPV6_EXPLICIT_NULL_LABEL;
	prefix.fp_payload_proto = DPO_PROTO_IP6;
	prefix.fp_eos = MPLS_EOS;

	lookup_dpo_add_or_lock_w_fib_index(0, //unused
	DPO_PROTO_IP6,
	LOOKUP_UNICAST,
	LOOKUP_INPUT_DST_ADDR,
	LOOKUP_TABLE_FROM_INPUT_INTERFACE,
	&dpo);
	fib_table_entry_special_dpo_add(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL,
	FIB_ENTRY_FLAG_EXCLUSIVE,
	&dpo);

	prefix.fp_payload_proto = DPO_PROTO_MPLS;
	prefix.fp_eos = MPLS_NON_EOS;
	lookup_dpo_add_or_lock_w_fib_index(0, // unsued
	DPO_PROTO_MPLS,
	LOOKUP_UNICAST,
	LOOKUP_INPUT_DST_ADDR,
	LOOKUP_TABLE_FROM_INPUT_INTERFACE,
	&dpo);
	fib_table_entry_special_dpo_add(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL,
	FIB_ENTRY_FLAG_EXCLUSIVE,
	&dpo);

	return (fib_table->ft_index);
	}

	u32
	mpls_fib_table_find_or_create_and_lock (u32 table_id)
	{
	u32 index;

	index = mpls_fib_index_from_table_id(table_id);
	if (~0 == index)
	return mpls_fib_create_with_table_id(table_id);

	fib_table_lock(index, FIB_PROTOCOL_MPLS);

	return (index);
	}
	u32
	mpls_fib_table_create_and_lock (void)
	{
	return (mpls_fib_create_with_table_id(~0));
	}

	void
	mpls_fib_table_destroy (u32 fib_index)
	{
	fib_table_t *fib_table = pool_elt_at_index(mpls_main.fibs, fib_index);
	mpls_fib_t *mf = pool_elt_at_index(mpls_main.mpls_fibs, fib_index);
	fib_prefix_t prefix = {
	.fp_proto = FIB_PROTOCOL_MPLS,
	};
	mpls_label_t special_labels[] = {
	MPLS_IETF_ROUTER_ALERT_LABEL,
	MPLS_IETF_IPV6_EXPLICIT_NULL_LABEL,
	MPLS_IETF_IPV4_EXPLICIT_NULL_LABEL,
	};
	mpls_eos_bit_t eos;
	u32 ii;

	for (ii = 0; ii < ARRAY_LEN(special_labels); ii++)
	{
	FOR_EACH_MPLS_EOS_BIT(eos)
	{
	prefix.fp_label = special_labels[ii];
	prefix.fp_eos = eos;

	fib_table_entry_delete(fib_table->ft_index,
	&prefix,
	FIB_SOURCE_SPECIAL);
	}
	}
	if (~0 != fib_table->ft_table_id)
	{
	hash_unset(mpls_main.fib_index_by_table_id,
	fib_table->ft_table_id);
	}
	hash_free(mf->mf_entries);

	pool_put(mpls_main.mpls_fibs, mf);
	pool_put(mpls_main.fibs, fib_table);
	}

	fib_node_index_t
	mpls_fib_table_lookup (const mpls_fib_t *mf,
	mpls_label_t label,
	mpls_eos_bit_t eos)
	{
	uword *p;

	p = hash_get(mf->mf_entries, mpls_fib_entry_mk_key(label, eos));

	if (NULL == p)
	return FIB_NODE_INDEX_INVALID;

	return p[0];
	}

	void
	mpls_fib_table_entry_insert (mpls_fib_t *mf,
	mpls_label_t label,
	mpls_eos_bit_t eos,
	fib_node_index_t lfei)
	{
	hash_set(mf->mf_entries, mpls_fib_entry_mk_key(label, eos), lfei);
	}

	void
	mpls_fib_table_entry_remove (mpls_fib_t *mf,
	mpls_label_t label,
	mpls_eos_bit_t eos)
	{
	hash_unset(mf->mf_entries, mpls_fib_entry_mk_key(label, eos));
	}

	void
	mpls_fib_forwarding_table_update (mpls_fib_t *mf,
	mpls_label_t label,
	mpls_eos_bit_t eos,
	const dpo_id_t *dpo)
	{
	mpls_label_t key;

	ASSERT((DPO_LOAD_BALANCE == dpo->dpoi_type) \|\|
	(DPO_REPLICATE == dpo->dpoi_type));
	if (CLIB_DEBUG > 0)
	{
	if (DPO_REPLICATE == dpo->dpoi_type)
	ASSERT(dpo->dpoi_index & MPLS_IS_REPLICATE);
	if (DPO_LOAD_BALANCE == dpo->dpoi_type)
	ASSERT(!(dpo->dpoi_index & MPLS_IS_REPLICATE));
	}
	key = mpls_fib_entry_mk_key(label, eos);

	mf->mf_lbs[key] = dpo->dpoi_index;
	}

	void
	mpls_fib_forwarding_table_reset (mpls_fib_t *mf,
	mpls_label_t label,
	mpls_eos_bit_t eos)
	{
	mpls_label_t key;

	key = mpls_fib_entry_mk_key(label, eos);

	mf->mf_lbs[key] = mpls_fib_drop_dpo_index;
	}

	void
	mpls_fib_table_walk (mpls_fib_t *mpls_fib,
	fib_table_walk_fn_t fn,
	void *ctx)
	{
	fib_node_index_t lfei;
	mpls_label_t key;

	hash_foreach(key, lfei, mpls_fib->mf_entries,
	({
	fn(lfei, ctx);
	}));
	}

	static void
	mpls_fib_table_show_all (const mpls_fib_t *mpls_fib,
	vlib_main_t * vm)
	{
	fib_node_index_t lfei, lfeip, lfeis = NULL;
	mpls_label_t key;

	hash_foreach(key, lfei, mpls_fib->mf_entries,
	({
	vec_add1(lfeis, lfei);
	}));

	vec_sort_with_function(lfeis, fib_entry_cmp_for_sort);

	vec_foreach(lfeip, lfeis)
	{
	vlib_cli_output (vm, "%U",
	format_fib_entry, *lfeip,
	FIB_ENTRY_FORMAT_DETAIL);
	}
	vec_free(lfeis);
	}

	static void
	mpls_fib_table_show_one (const mpls_fib_t *mpls_fib,
	mpls_label_t label,
	vlib_main_t * vm)
	{
	fib_node_index_t lfei;
	mpls_eos_bit_t eos;

	FOR_EACH_MPLS_EOS_BIT(eos)
	{
	lfei = mpls_fib_table_lookup(mpls_fib, label, eos);

	if (FIB_NODE_INDEX_INVALID != lfei)
	{
	vlib_cli_output (vm, "%U",
	format_fib_entry, lfei, FIB_ENTRY_FORMAT_DETAIL);
	}
	}
	}

	static clib_error_t *
	mpls_fib_show (vlib_main_t * vm,
	unformat_input_t * input,
	vlib_cli_command_t * cmd)
	{
	fib_table_t * fib_table;
	mpls_label_t label;
	int table_id;

	table_id = -1;
	label = MPLS_LABEL_INVALID;

	while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
	{
	/* if (unformat (input, "brief") \|\| unformat (input, "summary") */
	/* \|\| unformat (input, "sum")) */
	/* verbose = 0; */

	if (unformat (input, "%d", &label))
	continue;
	else if (unformat (input, "table %d", &table_id))
	;
	else
	break;
	}

	pool_foreach (fib_table, mpls_main.fibs,
	({
	if (table_id >= 0 && table_id != fib_table->ft_table_id)
	continue;

	vlib_cli_output (vm, "%v, fib_index %d",
	fib_table->ft_desc, mpls_main.fibs - fib_table);

	if (MPLS_LABEL_INVALID == label)
	{
	mpls_fib_table_show_all(mpls_fib_get(fib_table->ft_index), vm);
	}
	else
	{
	mpls_fib_table_show_one(mpls_fib_get(fib_table->ft_index), label, vm);
	}
	}));

	return 0;
	}

	VLIB_CLI_COMMAND (mpls_fib_show_command, static) = {
	.path = "show mpls fib",
	.short_help = "show mpls fib [summary] [table <n>]",
	.function = mpls_fib_show,
	};