src/vnet/mfib/ip4_mfib.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2016 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.
  */

 #include <vnet/mfib/ip4_mfib.h>

 #include <vnet/mfib/mfib_table.h>
 #include <vnet/mfib/mfib_entry.h>

 static const mfib_prefix_t ip4_specials[] = {
     {
         /* (*,*)/0 */
         .fp_src_addr = {
             .ip4.data_u32 = 0,
         },
         .fp_grp_addr = {
             .ip4.data_u32 = 0,
         },
         .fp_len  = 0,
         .fp_proto = FIB_PROTOCOL_IP4,
     },
 };

 static u32
 ip4_create_mfib_with_table_id (u32 table_id)
 {
     mfib_table_t *mfib_table;

     pool_get_aligned(ip4_main.mfibs, mfib_table, CLIB_CACHE_LINE_BYTES);
     memset(mfib_table, 0, sizeof(*mfib_table));

     mfib_table->mft_proto = FIB_PROTOCOL_IP4;
     mfib_table->mft_index =
         mfib_table->v4.index =
             (mfib_table - ip4_main.mfibs);

     hash_set (ip4_main.mfib_index_by_table_id,
               table_id,
               mfib_table->mft_index);

     mfib_table->mft_table_id =
         mfib_table->v4.table_id =
             table_id;

     mfib_table_lock(mfib_table->mft_index, FIB_PROTOCOL_IP4);

     /*
      * add the special entries into the new FIB
      */
     int ii;

     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
     {
         mfib_prefix_t prefix = ip4_specials[ii];

         prefix.fp_src_addr.ip4.data_u32 =
             clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
         prefix.fp_grp_addr.ip4.data_u32 =
             clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);

         mfib_table_entry_update(mfib_table->mft_index,
                                 &prefix,
                                 MFIB_SOURCE_DEFAULT_ROUTE,
                                 MFIB_ENTRY_FLAG_DROP);
     }

     return (mfib_table->mft_index);
 }

 void
 ip4_mfib_table_destroy (ip4_mfib_t *mfib)
 {
     mfib_table_t *mfib_table = (mfib_table_t*)mfib;
     int ii;

     /*
      * remove all the specials we added when the table was created.
      */
     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
     {
         fib_node_index_t mfei;
         mfib_prefix_t prefix = ip4_specials[ii];

         prefix.fp_src_addr.ip4.data_u32 =
             clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
         prefix.fp_grp_addr.ip4.data_u32 =
             clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);

         mfei = mfib_table_lookup(mfib_table->mft_index, &prefix);
         mfib_table_entry_delete_index(mfei, MFIB_SOURCE_DEFAULT_ROUTE);
     }

     /*
      * validate no more routes.
      */
     ASSERT(0 == mfib_table->mft_total_route_counts);
     ASSERT(~0 != mfib_table->mft_table_id);

     hash_unset (ip4_main.mfib_index_by_table_id, mfib_table->mft_table_id);
     pool_put(ip4_main.mfibs, mfib_table);
 }

 u32
 ip4_mfib_table_find_or_create_and_lock (u32 table_id)
 {
     u32 index;

     index = ip4_mfib_index_from_table_id(table_id);
     if (~0 == index)
         return ip4_create_mfib_with_table_id(table_id);
     mfib_table_lock(index, FIB_PROTOCOL_IP4);

     return (index);
 }

 u32
 ip4_mfib_table_get_index_for_sw_if_index (u32 sw_if_index)
 {
     if (sw_if_index >= vec_len(ip4_main.mfib_index_by_sw_if_index))
     {
         /*
          * This is the case for interfaces that are not yet mapped to
          * a IP table
          */
         return (~0);
     }
     return (ip4_main.mfib_index_by_sw_if_index[sw_if_index]);
 }

 #define IPV4_MFIB_GRP_LEN(_len)\
     (_len > 32 ? 32 : _len)

 #define IP4_MFIB_MK_KEY(_grp, _src, _len, _key)                         \
 {                                                                       \
     _key  = ((u64)(_grp->data_u32 &                                     \
                    ip4_main.fib_masks[IPV4_MFIB_GRP_LEN(_len)])) << 32; \
     _key |= _src->data_u32;                                             \
 }
 #define IP4_MFIB_MK_GRP_KEY(_grp, _len, _key)                           \
 {                                                                       \
     _key  = ((u64)(_grp->data_u32 &                                     \
                    ip4_main.fib_masks[IPV4_MFIB_GRP_LEN(_len)])) << 32; \
 }

 /*
  * ip4_fib_table_lookup_exact_match
  *
  * Exact match prefix lookup
  */
 fib_node_index_t
 ip4_mfib_table_lookup_exact_match (const ip4_mfib_t *mfib,
                                    const ip4_address_t *grp,
                                    const ip4_address_t *src,
                                    u32 len)
 {
     uword * hash, * result;
     u64 key;

     hash = mfib->fib_entry_by_dst_address[len];
     IP4_MFIB_MK_KEY(grp, src, len, key);

     result = hash_get(hash, key);

     if (NULL != result) {
         return (result[0]);
     }
     return (FIB_NODE_INDEX_INVALID);
 }

 /*
  * ip4_fib_table_lookup
  *
  * Longest prefix match
  */
 fib_node_index_t
 ip4_mfib_table_lookup (const ip4_mfib_t *mfib,
                        const ip4_address_t *src,
                        const ip4_address_t *grp,
                        u32 len)
 {
     uword * hash, * result;
     i32 mask_len;
     u64 key;

     mask_len = len;

     if (PREDICT_TRUE(64 == mask_len))
     {
         hash = mfib->fib_entry_by_dst_address[mask_len];
         IP4_MFIB_MK_KEY(grp, src, mask_len, key);

         result = hash_get (hash, key);

         if (NULL != result) {
             return (result[0]);
         }
     }

     for (mask_len = 32; mask_len >= 0; mask_len--)
     {
         hash = mfib->fib_entry_by_dst_address[mask_len];
         IP4_MFIB_MK_GRP_KEY(grp, mask_len, key);

         result = hash_get (hash, key);

         if (NULL != result) {
             return (result[0]);
         }
     }
     return (FIB_NODE_INDEX_INVALID);
 }

 void
 ip4_mfib_table_entry_insert (ip4_mfib_t *mfib,
                              const ip4_address_t *grp,
                              const ip4_address_t *src,
                              u32 len,
                              fib_node_index_t fib_entry_index)
 {
     uword * hash, * result;
     u64 key;

     IP4_MFIB_MK_KEY(grp, src, len, key);
     hash = mfib->fib_entry_by_dst_address[len];
     result = hash_get (hash, key);

     if (NULL == result) {
         /*
          * adding a new entry
          */
         if (NULL == hash) {
             hash = hash_create (32 /* elts */, sizeof (uword));
             hash_set_flags (hash, HASH_FLAG_NO_AUTO_SHRINK);
         }
         hash = hash_set(hash, key, fib_entry_index);
         mfib->fib_entry_by_dst_address[len] = hash;
     }
     else
     {
         ASSERT(0);
     }
 }

 void
 ip4_mfib_table_entry_remove (ip4_mfib_t *mfib,
                              const ip4_address_t *grp,
                              const ip4_address_t *src,
                              u32 len)
 {
     uword * hash, * result;
     u64 key;

     IP4_MFIB_MK_KEY(grp, src, len, key);
     hash = mfib->fib_entry_by_dst_address[len];
     result = hash_get (hash, key);

     if (NULL == result)
     {
         /*
          * removing a non-existant entry. i'll allow it.
          */
     }
     else
     {
         hash_unset(hash, key);
     }

     mfib->fib_entry_by_dst_address[len] = hash;
 }

 void
 ip4_mfib_table_walk (ip4_mfib_t *mfib,
                      mfib_table_walk_fn_t fn,
                      void *ctx)
 {
     int i;

     for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
     {
 	uword * hash = mfib->fib_entry_by_dst_address[i];

 	if (NULL != hash)
 	{
 	    hash_pair_t * p;

 	    hash_foreach_pair (p, hash,
 	    ({
 		fn(p->value[0], ctx);
 	    }));
 	}
     }
 }

 static void
 ip4_mfib_table_show_all (ip4_mfib_t *mfib,
                          vlib_main_t * vm)
 {
     fib_node_index_t *mfib_entry_indicies;
     fib_node_index_t *mfib_entry_index;
     int i;

     mfib_entry_indicies = NULL;

     for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
     {
         uword * hash = mfib->fib_entry_by_dst_address[i];

         if (NULL != hash)
         {
             hash_pair_t * p;

             hash_foreach_pair (p, hash,
             ({
                 vec_add1(mfib_entry_indicies, p->value[0]);
             }));
         }
     }

     vec_sort_with_function(mfib_entry_indicies, mfib_entry_cmp_for_sort);

     vec_foreach(mfib_entry_index, mfib_entry_indicies)
     {
         vlib_cli_output(vm, "%U",
                         format_mfib_entry,
                         *mfib_entry_index,
                         MFIB_ENTRY_FORMAT_BRIEF);
     }

     vec_free(mfib_entry_indicies);
 }

 static void
 ip4_mfib_table_show_one (ip4_mfib_t *mfib,
                          vlib_main_t * vm,
                          ip4_address_t *src,
                          ip4_address_t *grp,
                          u32 mask_len)
 {
     vlib_cli_output(vm, "%U",
                     format_mfib_entry,
                     ip4_mfib_table_lookup(mfib, src, grp, mask_len),
                     MFIB_ENTRY_FORMAT_DETAIL);
 }

 static clib_error_t *
 ip4_show_mfib (vlib_main_t * vm,
                unformat_input_t * input,
                vlib_cli_command_t * cmd)
 {
     ip4_main_t * im4 = &ip4_main;
     mfib_table_t *mfib_table;
     int verbose, matching;
     ip4_address_t grp, src = {{0}};
     u32 mask = 32;
     int i, table_id = -1, fib_index = ~0;

     verbose = 1;
     matching = 0;

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

         else if (unformat (input, "%U %U",
                            unformat_ip4_address, &src,
                            unformat_ip4_address, &grp))
         {
             matching = 1;
             mask = 64;
         }
         else if (unformat (input, "%U", unformat_ip4_address, &grp))
         {
             matching = 1;
             mask = 32;
         }
         else if (unformat (input, "%U/%d",
                            unformat_ip4_address, &grp, &mask))
             matching = 1;
         else if (unformat (input, "table %d", &table_id))
             ;
         else if (unformat (input, "index %d", &fib_index))
             ;
         else
             break;
     }

     pool_foreach (mfib_table, im4->mfibs,
     ({
         ip4_mfib_t *mfib = &mfib_table->v4;

         if (table_id >= 0 && table_id != (int)mfib->table_id)
             continue;
         if (fib_index != ~0 && fib_index != (int)mfib->index)
             continue;

         vlib_cli_output (vm, "%U, fib_index %d",
                          format_mfib_table_name, mfib->index, FIB_PROTOCOL_IP4,
                          mfib->index);

         /* Show summary? */
         if (! verbose)
         {
             vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
             for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
             {
                 uword * hash = mfib->fib_entry_by_dst_address[i];
                 uword n_elts = hash_elts (hash);
                 if (n_elts > 0)
                     vlib_cli_output (vm, "%20d%16d", i, n_elts);
             }
             continue;
         }

         if (!matching)
         {
             ip4_mfib_table_show_all(mfib, vm);
         }
         else
         {
             ip4_mfib_table_show_one(mfib, vm, &src, &grp, mask);
         }
     }));

     return 0;
 }

 /*?
  * This command displays the IPv4 MulticasrFIB Tables (VRF Tables) and
  * the route entries for each table.
  *
  * @note This command will run for a long time when the FIB tables are
  * comprised of millions of entries. For those senarios, consider displaying
  * a single table or summary mode.
  *
  * @cliexpar
  * Example of how to display all the IPv4 Multicast FIB tables:
  * @cliexstart{show ip fib}
  * ipv4-VRF:0, fib_index 0
  * (*, 0.0.0.0/0):  flags:D,
  *  Interfaces:
  *  multicast-ip4-chain
  *   [@1]: dpo-drop ip4
  * (*, 232.1.1.1/32):
  * Interfaces:
  *  test-eth1: Forward,
  *  test-eth2: Forward,
  *  test-eth0: Accept,
  * multicast-ip4-chain
  * [@2]: dpo-replicate: [index:1 buckets:2 to:[0:0]]
  *   [0] [@1]: ipv4-mcast: test-eth1: IP4: d0:d1:d2:d3:d4:01 -> 01:00:05:00:00:00
  *   [1] [@1]: ipv4-mcast: test-eth2: IP4: d0:d1:d2:d3:d4:02 -> 01:00:05:00:00:00
  *
  * @cliexend
  * Example of how to display a summary of all IPv4 FIB tables:
  * @cliexstart{show ip fib summary}
  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
  *     Prefix length         Count
  *                    0               1
  *                    8               2
  *                   32               4
  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
  *     Prefix length         Count
  *                    0               1
  *                    8               2
  *                   24               2
  *                   32               4
  * @cliexend
  ?*/
 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (ip4_show_mfib_command, static) = {
     .path = "show ip mfib",
     .short_help = "show ip mfib [summary] [table <table-id>] [index <fib-id>] [<grp-addr>[/<mask>]] [<grp-addr>] [<src-addr> <grp-addr>]",
     .function = ip4_show_mfib,
 };
 /* *INDENT-ON* */
	/*
	* Copyright (c) 2016 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.
	*/

	#include <vnet/mfib/ip4_mfib.h>

	#include <vnet/mfib/mfib_table.h>
	#include <vnet/mfib/mfib_entry.h>

	static const mfib_prefix_t ip4_specials[] = {
	{
	/* (,)/0 */
	.fp_src_addr = {
	.ip4.data_u32 = 0,
	},
	.fp_grp_addr = {
	.ip4.data_u32 = 0,
	},
	.fp_len = 0,
	.fp_proto = FIB_PROTOCOL_IP4,
	},
	};

	static u32
	ip4_create_mfib_with_table_id (u32 table_id)
	{
	mfib_table_t *mfib_table;

	pool_get_aligned(ip4_main.mfibs, mfib_table, CLIB_CACHE_LINE_BYTES);
	memset(mfib_table, 0, sizeof(*mfib_table));

	mfib_table->mft_proto = FIB_PROTOCOL_IP4;
	mfib_table->mft_index =
	mfib_table->v4.index =
	(mfib_table - ip4_main.mfibs);

	hash_set (ip4_main.mfib_index_by_table_id,
	table_id,
	mfib_table->mft_index);

	mfib_table->mft_table_id =
	mfib_table->v4.table_id =
	table_id;

	mfib_table_lock(mfib_table->mft_index, FIB_PROTOCOL_IP4);

	/*
	* add the special entries into the new FIB
	*/
	int ii;

	for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
	{
	mfib_prefix_t prefix = ip4_specials[ii];

	prefix.fp_src_addr.ip4.data_u32 =
	clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
	prefix.fp_grp_addr.ip4.data_u32 =
	clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);

	mfib_table_entry_update(mfib_table->mft_index,
	&prefix,
	MFIB_SOURCE_DEFAULT_ROUTE,
	MFIB_ENTRY_FLAG_DROP);
	}

	return (mfib_table->mft_index);
	}

	void
	ip4_mfib_table_destroy (ip4_mfib_t *mfib)
	{
	mfib_table_t mfib_table = (mfib_table_t)mfib;
	int ii;

	/*
	* remove all the specials we added when the table was created.
	*/
	for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
	{
	fib_node_index_t mfei;
	mfib_prefix_t prefix = ip4_specials[ii];

	prefix.fp_src_addr.ip4.data_u32 =
	clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
	prefix.fp_grp_addr.ip4.data_u32 =
	clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);

	mfei = mfib_table_lookup(mfib_table->mft_index, &prefix);
	mfib_table_entry_delete_index(mfei, MFIB_SOURCE_DEFAULT_ROUTE);
	}

	/*
	* validate no more routes.
	*/
	ASSERT(0 == mfib_table->mft_total_route_counts);
	ASSERT(~0 != mfib_table->mft_table_id);

	hash_unset (ip4_main.mfib_index_by_table_id, mfib_table->mft_table_id);
	pool_put(ip4_main.mfibs, mfib_table);
	}

	u32
	ip4_mfib_table_find_or_create_and_lock (u32 table_id)
	{
	u32 index;

	index = ip4_mfib_index_from_table_id(table_id);
	if (~0 == index)
	return ip4_create_mfib_with_table_id(table_id);
	mfib_table_lock(index, FIB_PROTOCOL_IP4);

	return (index);
	}

	u32
	ip4_mfib_table_get_index_for_sw_if_index (u32 sw_if_index)
	{
	if (sw_if_index >= vec_len(ip4_main.mfib_index_by_sw_if_index))
	{
	/*
	* This is the case for interfaces that are not yet mapped to
	* a IP table
	*/
	return (~0);
	}
	return (ip4_main.mfib_index_by_sw_if_index[sw_if_index]);
	}

	#define IPV4_MFIB_GRP_LEN(_len)\
	(_len > 32 ? 32 : _len)

	#define IP4_MFIB_MK_KEY(_grp, _src, _len, _key) \
	{ \
	_key = ((u64)(_grp->data_u32 & \
	ip4_main.fib_masks[IPV4_MFIB_GRP_LEN(_len)])) << 32; \
	_key \|= _src->data_u32; \
	}
	#define IP4_MFIB_MK_GRP_KEY(_grp, _len, _key) \
	{ \
	_key = ((u64)(_grp->data_u32 & \
	ip4_main.fib_masks[IPV4_MFIB_GRP_LEN(_len)])) << 32; \
	}

	/*
	* ip4_fib_table_lookup_exact_match
	*
	* Exact match prefix lookup
	*/
	fib_node_index_t
	ip4_mfib_table_lookup_exact_match (const ip4_mfib_t *mfib,
	const ip4_address_t *grp,
	const ip4_address_t *src,
	u32 len)
	{
	uword * hash, * result;
	u64 key;

	hash = mfib->fib_entry_by_dst_address[len];
	IP4_MFIB_MK_KEY(grp, src, len, key);

	result = hash_get(hash, key);

	if (NULL != result) {
	return (result[0]);
	}
	return (FIB_NODE_INDEX_INVALID);
	}

	/*
	* ip4_fib_table_lookup
	*
	* Longest prefix match
	*/
	fib_node_index_t
	ip4_mfib_table_lookup (const ip4_mfib_t *mfib,
	const ip4_address_t *src,
	const ip4_address_t *grp,
	u32 len)
	{
	uword * hash, * result;
	i32 mask_len;
	u64 key;

	mask_len = len;

	if (PREDICT_TRUE(64 == mask_len))
	{
	hash = mfib->fib_entry_by_dst_address[mask_len];
	IP4_MFIB_MK_KEY(grp, src, mask_len, key);

	result = hash_get (hash, key);

	if (NULL != result) {
	return (result[0]);
	}
	}

	for (mask_len = 32; mask_len >= 0; mask_len--)
	{
	hash = mfib->fib_entry_by_dst_address[mask_len];
	IP4_MFIB_MK_GRP_KEY(grp, mask_len, key);

	result = hash_get (hash, key);

	if (NULL != result) {
	return (result[0]);
	}
	}
	return (FIB_NODE_INDEX_INVALID);
	}

	void
	ip4_mfib_table_entry_insert (ip4_mfib_t *mfib,
	const ip4_address_t *grp,
	const ip4_address_t *src,
	u32 len,
	fib_node_index_t fib_entry_index)
	{
	uword * hash, * result;
	u64 key;

	IP4_MFIB_MK_KEY(grp, src, len, key);
	hash = mfib->fib_entry_by_dst_address[len];
	result = hash_get (hash, key);

	if (NULL == result) {
	/*
	* adding a new entry
	*/
	if (NULL == hash) {
	hash = hash_create (32 /* elts */, sizeof (uword));
	hash_set_flags (hash, HASH_FLAG_NO_AUTO_SHRINK);
	}
	hash = hash_set(hash, key, fib_entry_index);
	mfib->fib_entry_by_dst_address[len] = hash;
	}
	else
	{
	ASSERT(0);
	}
	}

	void
	ip4_mfib_table_entry_remove (ip4_mfib_t *mfib,
	const ip4_address_t *grp,
	const ip4_address_t *src,
	u32 len)
	{
	uword * hash, * result;
	u64 key;

	IP4_MFIB_MK_KEY(grp, src, len, key);
	hash = mfib->fib_entry_by_dst_address[len];
	result = hash_get (hash, key);

	if (NULL == result)
	{
	/*
	* removing a non-existant entry. i'll allow it.
	*/
	}
	else
	{
	hash_unset(hash, key);
	}

	mfib->fib_entry_by_dst_address[len] = hash;
	}

	void
	ip4_mfib_table_walk (ip4_mfib_t *mfib,
	mfib_table_walk_fn_t fn,
	void *ctx)
	{
	int i;

	for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
	{
	uword * hash = mfib->fib_entry_by_dst_address[i];

	if (NULL != hash)
	{
	hash_pair_t * p;

	hash_foreach_pair (p, hash,
	({
	fn(p->value[0], ctx);
	}));
	}
	}
	}

	static void
	ip4_mfib_table_show_all (ip4_mfib_t *mfib,
	vlib_main_t * vm)
	{
	fib_node_index_t *mfib_entry_indicies;
	fib_node_index_t *mfib_entry_index;
	int i;

	mfib_entry_indicies = NULL;

	for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
	{
	uword * hash = mfib->fib_entry_by_dst_address[i];

	if (NULL != hash)
	{
	hash_pair_t * p;

	hash_foreach_pair (p, hash,
	({
	vec_add1(mfib_entry_indicies, p->value[0]);
	}));
	}
	}

	vec_sort_with_function(mfib_entry_indicies, mfib_entry_cmp_for_sort);

	vec_foreach(mfib_entry_index, mfib_entry_indicies)
	{
	vlib_cli_output(vm, "%U",
	format_mfib_entry,
	*mfib_entry_index,
	MFIB_ENTRY_FORMAT_BRIEF);
	}

	vec_free(mfib_entry_indicies);
	}

	static void
	ip4_mfib_table_show_one (ip4_mfib_t *mfib,
	vlib_main_t * vm,
	ip4_address_t *src,
	ip4_address_t *grp,
	u32 mask_len)
	{
	vlib_cli_output(vm, "%U",
	format_mfib_entry,
	ip4_mfib_table_lookup(mfib, src, grp, mask_len),
	MFIB_ENTRY_FORMAT_DETAIL);
	}

	static clib_error_t *
	ip4_show_mfib (vlib_main_t * vm,
	unformat_input_t * input,
	vlib_cli_command_t * cmd)
	{
	ip4_main_t * im4 = &ip4_main;
	mfib_table_t *mfib_table;
	int verbose, matching;
	ip4_address_t grp, src = {{0}};
	u32 mask = 32;
	int i, table_id = -1, fib_index = ~0;

	verbose = 1;
	matching = 0;

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

	else if (unformat (input, "%U %U",
	unformat_ip4_address, &src,
	unformat_ip4_address, &grp))
	{
	matching = 1;
	mask = 64;
	}
	else if (unformat (input, "%U", unformat_ip4_address, &grp))
	{
	matching = 1;
	mask = 32;
	}
	else if (unformat (input, "%U/%d",
	unformat_ip4_address, &grp, &mask))
	matching = 1;
	else if (unformat (input, "table %d", &table_id))
	;
	else if (unformat (input, "index %d", &fib_index))
	;
	else
	break;
	}

	pool_foreach (mfib_table, im4->mfibs,
	({
	ip4_mfib_t *mfib = &mfib_table->v4;

	if (table_id >= 0 && table_id != (int)mfib->table_id)
	continue;
	if (fib_index != ~0 && fib_index != (int)mfib->index)
	continue;

	vlib_cli_output (vm, "%U, fib_index %d",
	format_mfib_table_name, mfib->index, FIB_PROTOCOL_IP4,
	mfib->index);

	/* Show summary? */
	if (! verbose)
	{
	vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
	for (i = 0; i < ARRAY_LEN (mfib->fib_entry_by_dst_address); i++)
	{
	uword * hash = mfib->fib_entry_by_dst_address[i];
	uword n_elts = hash_elts (hash);
	if (n_elts > 0)
	vlib_cli_output (vm, "%20d%16d", i, n_elts);
	}
	continue;
	}

	if (!matching)
	{
	ip4_mfib_table_show_all(mfib, vm);
	}
	else
	{
	ip4_mfib_table_show_one(mfib, vm, &src, &grp, mask);
	}
	}));

	return 0;
	}

	/*?
	* This command displays the IPv4 MulticasrFIB Tables (VRF Tables) and
	* the route entries for each table.
	*
	* @note This command will run for a long time when the FIB tables are
	* comprised of millions of entries. For those senarios, consider displaying
	* a single table or summary mode.
	*
	* @cliexpar
	* Example of how to display all the IPv4 Multicast FIB tables:
	* @cliexstart{show ip fib}
	* ipv4-VRF:0, fib_index 0
	* (*, 0.0.0.0/0): flags:D,
	* Interfaces:
	* multicast-ip4-chain
	* [@1]: dpo-drop ip4
	* (*, 232.1.1.1/32):
	* Interfaces:
	* test-eth1: Forward,
	* test-eth2: Forward,
	* test-eth0: Accept,
	* multicast-ip4-chain
	* [@2]: dpo-replicate: [index:1 buckets:2 to:[0:0]]
	* [0] [@1]: ipv4-mcast: test-eth1: IP4: d0:d1:d2:d3:d4:01 -> 01:00:05:00:00:00
	* [1] [@1]: ipv4-mcast: test-eth2: IP4: d0:d1:d2:d3:d4:02 -> 01:00:05:00:00:00
	*
	* @cliexend
	* Example of how to display a summary of all IPv4 FIB tables:
	* @cliexstart{show ip fib summary}
	* ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
	* Prefix length Count
	* 0 1
	* 8 2
	* 32 4
	* ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
	* Prefix length Count
	* 0 1
	* 8 2
	* 24 2
	* 32 4
	* @cliexend
	?*/
	/* INDENT-OFF */
	VLIB_CLI_COMMAND (ip4_show_mfib_command, static) = {
	.path = "show ip mfib",
	.short_help = "show ip mfib [summary] [table <table-id>] [index <fib-id>] [<grp-addr>[/<mask>]] [<grp-addr>] [<src-addr> <grp-addr>]",
	.function = ip4_show_mfib,
	};
	/* INDENT-ON */