src/vnet/fib/ip6_fib.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/fib/ip6_fib.h>
  17 #include <vnet/fib/fib_table.h>
  18
  19 static void
  20 vnet_ip6_fib_init (u32 fib_index)
  21 {
  22     fib_prefix_t pfx = {
  23         .fp_proto = FIB_PROTOCOL_IP6,
  24         .fp_len = 0,
  25         .fp_addr = {
  26             .ip6 = {
  27                 { 0, 0, },
  28             },
  29         }
  30     };
  31
  32     /*
  33      * Add the default route.
  34      */
  35     fib_table_entry_special_add(fib_index,
  36                                 &pfx,
  37                                 FIB_SOURCE_DEFAULT_ROUTE,
  38                                 FIB_ENTRY_FLAG_DROP);
  39
  40     /*
  41      * all link local for us
  42      */
  43     pfx.fp_addr.ip6.as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
  44     pfx.fp_addr.ip6.as_u64[1] = 0;
  45     pfx.fp_len = 10;
  46     fib_table_entry_special_add(fib_index,
  47                                 &pfx,
  48                                 FIB_SOURCE_SPECIAL,
  49                                 FIB_ENTRY_FLAG_LOCAL);
  50 }
  51
  52 static u32
  53 create_fib_with_table_id (u32 table_id)
  54 {
  55     fib_table_t *fib_table;
  56     ip6_fib_t *v6_fib;
  57
  58     pool_get_aligned(ip6_main.fibs, fib_table, CLIB_CACHE_LINE_BYTES);
  59     pool_get_aligned(ip6_main.v6_fibs, v6_fib, CLIB_CACHE_LINE_BYTES);
  60
  61     memset(fib_table, 0, sizeof(*fib_table));
  62     memset(v6_fib, 0, sizeof(*v6_fib));
  63
  64     ASSERT((fib_table - ip6_main.fibs) ==
  65            (v6_fib - ip6_main.v6_fibs));
  66
  67     fib_table->ft_proto = FIB_PROTOCOL_IP6;
  68     fib_table->ft_index =
  69             v6_fib->index =
  70                 (fib_table - ip6_main.fibs);
  71
  72     hash_set(ip6_main.fib_index_by_table_id, table_id, fib_table->ft_index);
  73
  74     fib_table->ft_table_id =
  75         v6_fib->table_id =
  76             table_id;
  77     fib_table->ft_flow_hash_config =
  78         v6_fib->flow_hash_config =
  79             IP_FLOW_HASH_DEFAULT;
  80
  81     vnet_ip6_fib_init(fib_table->ft_index);
  82     fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_IP6);
  83
  84     return (fib_table->ft_index);
  85 }
  86
  87 u32
  88 ip6_fib_table_find_or_create_and_lock (u32 table_id)
  89 {
  90     uword * p;
  91
  92     p = hash_get (ip6_main.fib_index_by_table_id, table_id);
  93     if (NULL == p)
  94         return create_fib_with_table_id(table_id);
  95
  96     fib_table_lock(p[0], FIB_PROTOCOL_IP6);
  97
  98     return (p[0]);
  99 }
 100
 101 u32
 102 ip6_fib_table_create_and_lock (void)
 103 {
 104     return (create_fib_with_table_id(~0));
 105 }
 106
 107 void
 108 ip6_fib_table_destroy (u32 fib_index)
 109 {
 110     fib_prefix_t pfx = {
 111         .fp_proto = FIB_PROTOCOL_IP6,
 112         .fp_len = 0,
 113         .fp_addr = {
 114             .ip6 = {
 115                 { 0, 0, },
 116             },
 117         }
 118     };
 119
 120     /*
 121      * the default route.
 122      */
 123     fib_table_entry_special_remove(fib_index,
 124                                    &pfx,
 125                                    FIB_SOURCE_DEFAULT_ROUTE);
 126
 127
 128     /*
 129      * ff02::1:ff00:0/104
 130      */
 131     ip6_set_solicited_node_multicast_address(&pfx.fp_addr.ip6, 0);
 132     pfx.fp_len = 104;
 133     fib_table_entry_special_remove(fib_index,
 134                                    &pfx,
 135                                    FIB_SOURCE_SPECIAL);
 136
 137     /*
 138      * all-routers multicast address
 139      */
 140     ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
 141                                         IP6_MULTICAST_SCOPE_link_local,
 142                                         IP6_MULTICAST_GROUP_ID_all_routers);
 143     pfx.fp_len = 128;
 144     fib_table_entry_special_remove(fib_index,
 145                                    &pfx,
 146                                    FIB_SOURCE_SPECIAL);
 147
 148     /*
 149      * all-nodes multicast address
 150      */
 151     ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
 152                                         IP6_MULTICAST_SCOPE_link_local,
 153                                         IP6_MULTICAST_GROUP_ID_all_hosts);
 154     pfx.fp_len = 128;
 155     fib_table_entry_special_remove(fib_index,
 156                                    &pfx,
 157                                    FIB_SOURCE_SPECIAL);
 158
 159     /*
 160      * all-mldv2 multicast address
 161      */
 162     ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
 163                                         IP6_MULTICAST_SCOPE_link_local,
 164                                         IP6_MULTICAST_GROUP_ID_mldv2_routers);
 165     pfx.fp_len = 128;
 166     fib_table_entry_special_remove(fib_index,
 167                                    &pfx,
 168                                    FIB_SOURCE_SPECIAL);
 169
 170     /*
 171      * all link local
 172      */
 173     pfx.fp_addr.ip6.as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
 174     pfx.fp_addr.ip6.as_u64[1] = 0;
 175     pfx.fp_len = 10;
 176     fib_table_entry_special_remove(fib_index,
 177                                    &pfx,
 178                                    FIB_SOURCE_SPECIAL);
 179
 180     fib_table_t *fib_table = fib_table_get(fib_index, FIB_PROTOCOL_IP6);
 181     fib_source_t source;
 182
 183      /*
 184      * validate no more routes.
 185      */
 186     ASSERT(0 == fib_table->ft_total_route_counts);
 187     FOR_EACH_FIB_SOURCE(source)
 188     {
 189         ASSERT(0 == fib_table->ft_src_route_counts[source]);
 190     }
 191
 192     if (~0 != fib_table->ft_table_id)
 193     {
 194         hash_unset (ip6_main.fib_index_by_table_id, fib_table->ft_table_id);
 195     }
 196     pool_put_index(ip6_main.v6_fibs, fib_table->ft_index);
 197     pool_put(ip6_main.fibs, fib_table);
 198 }
 199
 200 fib_node_index_t
 201 ip6_fib_table_lookup (u32 fib_index,
 202                       const ip6_address_t *addr,
 203                       u32 len)
 204 {
 205     const ip6_fib_table_instance_t *table;
 206     BVT(clib_bihash_kv) kv, value;
 207     int i, n_p, rv;
 208     u64 fib;
 209
 210     table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
 211     n_p = vec_len (table->prefix_lengths_in_search_order);
 212
 213     kv.key[0] = addr->as_u64[0];
 214     kv.key[1] = addr->as_u64[1];
 215     fib = ((u64)((fib_index))<<32);
 216
 217     /*
 218      * start search from a mask length same length or shorter.
 219      * we don't want matches longer than the mask passed
 220      */
 221     i = 0;
 222     while (i < n_p && table->prefix_lengths_in_search_order[i] > len)
 223     {
 224         i++;
 225     }
 226
 227     for (; i < n_p; i++)
 228     {
 229         int dst_address_length = table->prefix_lengths_in_search_order[i];
 230         ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
 231
 232         ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
 233         //As lengths are decreasing, masks are increasingly specific.
 234         kv.key[0] &= mask->as_u64[0];
 235         kv.key[1] &= mask->as_u64[1];
 236         kv.key[2] = fib | dst_address_length;
 237
 238         rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
 239         if (rv == 0)
 240             return value.value;
 241     }
 242
 243     return (FIB_NODE_INDEX_INVALID);
 244 }
 245
 246 fib_node_index_t
 247 ip6_fib_table_lookup_exact_match (u32 fib_index,
 248                                   const ip6_address_t *addr,
 249                                   u32 len)
 250 {
 251     const ip6_fib_table_instance_t *table;
 252     BVT(clib_bihash_kv) kv, value;
 253     ip6_address_t *mask;
 254     u64 fib;
 255     int rv;
 256
 257     table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
 258     mask = &ip6_main.fib_masks[len];
 259     fib = ((u64)((fib_index))<<32);
 260
 261     kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
 262     kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
 263     kv.key[2] = fib | len;
 264
 265     rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
 266     if (rv == 0)
 267         return value.value;
 268
 269     return (FIB_NODE_INDEX_INVALID);
 270 }
 271
 272 static void
 273 compute_prefix_lengths_in_search_order (ip6_fib_table_instance_t *table)
 274 {
 275     int i;
 276     vec_reset_length (table->prefix_lengths_in_search_order);
 277     /* Note: bitmap reversed so this is in fact a longest prefix match */
 278     clib_bitmap_foreach (i, table->non_empty_dst_address_length_bitmap,
 279     ({
 280         int dst_address_length = 128 - i;
 281         vec_add1(table->prefix_lengths_in_search_order, dst_address_length);
 282     }));
 283 }
 284
 285 void
 286 ip6_fib_table_entry_remove (u32 fib_index,
 287                             const ip6_address_t *addr,
 288                             u32 len)
 289 {
 290     ip6_fib_table_instance_t *table;
 291     BVT(clib_bihash_kv) kv;
 292     ip6_address_t *mask;
 293     u64 fib;
 294
 295     table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
 296     mask = &ip6_main.fib_masks[len];
 297     fib = ((u64)((fib_index))<<32);
 298
 299     kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
 300     kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
 301     kv.key[2] = fib | len;
 302
 303     BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 0);
 304
 305     /* refcount accounting */
 306     ASSERT (table->dst_address_length_refcounts[len] > 0);
 307     if (--table->dst_address_length_refcounts[len] == 0)
 308     {
 309         table->non_empty_dst_address_length_bitmap =
 310             clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
 311                              128 - len, 0);
 312         compute_prefix_lengths_in_search_order (table);
 313     }
 314 }
 315
 316 void
 317 ip6_fib_table_entry_insert (u32 fib_index,
 318                             const ip6_address_t *addr,
 319                             u32 len,
 320                             fib_node_index_t fib_entry_index)
 321 {
 322     ip6_fib_table_instance_t *table;
 323     BVT(clib_bihash_kv) kv;
 324     ip6_address_t *mask;
 325     u64 fib;
 326
 327     table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
 328     mask = &ip6_main.fib_masks[len];
 329     fib = ((u64)((fib_index))<<32);
 330
 331     kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
 332     kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
 333     kv.key[2] = fib | len;
 334     kv.value = fib_entry_index;
 335
 336     BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 1);
 337
 338     table->dst_address_length_refcounts[len]++;
 339
 340     table->non_empty_dst_address_length_bitmap =
 341         clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
 342                          128 - len, 1);
 343     compute_prefix_lengths_in_search_order (table);
 344 }
 345
 346 u32
 347 ip6_fib_table_fwding_lookup (ip6_main_t * im,
 348                              u32 fib_index,
 349                              const ip6_address_t * dst)
 350 {
 351     const ip6_fib_table_instance_t *table;
 352     int i, len;
 353     int rv;
 354     BVT(clib_bihash_kv) kv, value;
 355     u64 fib;
 356
 357     table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
 358     len = vec_len (table->prefix_lengths_in_search_order);
 359
 360     kv.key[0] = dst->as_u64[0];
 361     kv.key[1] = dst->as_u64[1];
 362     fib = ((u64)((fib_index))<<32);
 363
 364     for (i = 0; i < len; i++)
 365     {
 366         int dst_address_length = table->prefix_lengths_in_search_order[i];
 367         ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
 368
 369         ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
 370         //As lengths are decreasing, masks are increasingly specific.
 371         kv.key[0] &= mask->as_u64[0];
 372         kv.key[1] &= mask->as_u64[1];
 373         kv.key[2] = fib | dst_address_length;
 374
 375         rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
 376         if (rv == 0)
 377             return value.value;
 378     }
 379
 380     /* default route is always present */
 381     ASSERT(0);
 382     return 0;
 383 }
 384
 385 u32 ip6_fib_table_fwding_lookup_with_if_index (ip6_main_t * im,
 386                                                u32 sw_if_index,
 387                                                const ip6_address_t * dst)
 388 {
 389     u32 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 390     return ip6_fib_table_fwding_lookup(im, fib_index, dst);
 391 }
 392
 393 flow_hash_config_t
 394 ip6_fib_table_get_flow_hash_config (u32 fib_index)
 395 {
 396     return (ip6_fib_get(fib_index)->flow_hash_config);
 397 }
 398
 399 u32
 400 ip6_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
 401 {
 402     if (sw_if_index >= vec_len(ip6_main.fib_index_by_sw_if_index))
 403     {
 404         /*
 405          * This is the case for interfaces that are not yet mapped to
 406          * a IP table
 407          */
 408         return (~0);
 409     }
 410     return (ip6_main.fib_index_by_sw_if_index[sw_if_index]);
 411 }
 412
 413 void
 414 ip6_fib_table_fwding_dpo_update (u32 fib_index,
 415                                  const ip6_address_t *addr,
 416                                  u32 len,
 417                                  const dpo_id_t *dpo)
 418 {
 419     ip6_fib_table_instance_t *table;
 420     BVT(clib_bihash_kv) kv;
 421     ip6_address_t *mask;
 422     u64 fib;
 423
 424     table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
 425     mask = &ip6_main.fib_masks[len];
 426     fib = ((u64)((fib_index))<<32);
 427
 428     kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
 429     kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
 430     kv.key[2] = fib | len;
 431     kv.value = dpo->dpoi_index;
 432
 433     BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 1);
 434
 435     table->dst_address_length_refcounts[len]++;
 436
 437     table->non_empty_dst_address_length_bitmap =
 438         clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
 439                          128 - len, 1);
 440     compute_prefix_lengths_in_search_order (table);
 441 }
 442
 443 void
 444 ip6_fib_table_fwding_dpo_remove (u32 fib_index,
 445                                  const ip6_address_t *addr,
 446                                  u32 len,
 447                                  const dpo_id_t *dpo)
 448 {
 449     ip6_fib_table_instance_t *table;
 450     BVT(clib_bihash_kv) kv;
 451     ip6_address_t *mask;
 452     u64 fib;
 453
 454     table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
 455     mask = &ip6_main.fib_masks[len];
 456     fib = ((u64)((fib_index))<<32);
 457
 458     kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
 459     kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
 460     kv.key[2] = fib | len;
 461     kv.value = dpo->dpoi_index;
 462
 463     BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 0);
 464
 465     /* refcount accounting */
 466     ASSERT (table->dst_address_length_refcounts[len] > 0);
 467     if (--table->dst_address_length_refcounts[len] == 0)
 468     {
 469         table->non_empty_dst_address_length_bitmap =
 470             clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
 471                              128 - len, 0);
 472         compute_prefix_lengths_in_search_order (table);
 473     }
 474 }
 475
 476 /**
 477  * @brief Context when walking the IPv6 table. Since all VRFs are in the
 478  * same hash table, we need to filter only those we need as we walk
 479  */
 480 typedef struct ip6_fib_walk_ctx_t_
 481 {
 482     u32 i6w_fib_index;
 483     fib_table_walk_fn_t i6w_fn;
 484     void *i6w_ctx;
 485 } ip6_fib_walk_ctx_t;
 486
 487 static int
 488 ip6_fib_walk_cb (clib_bihash_kv_24_8_t * kvp,
 489                  void *arg)
 490 {
 491     ip6_fib_walk_ctx_t *ctx = arg;
 492
 493     if ((kvp->key[2] >> 32) == ctx->i6w_fib_index)
 494     {
 495         ctx->i6w_fn(kvp->value, ctx->i6w_ctx);
 496     }
 497
 498     return (1);
 499 }
 500
 501 void
 502 ip6_fib_table_walk (u32 fib_index,
 503                     fib_table_walk_fn_t fn,
 504                     void *arg)
 505 {
 506     ip6_fib_walk_ctx_t ctx = {
 507         .i6w_fib_index = fib_index,
 508         .i6w_fn = fn,
 509         .i6w_ctx = arg,
 510     };
 511     ip6_main_t *im = &ip6_main;
 512
 513     BV(clib_bihash_foreach_key_value_pair)(&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
 514                                            ip6_fib_walk_cb,
 515                                            &ctx);
 516
 517 }
 518
 519 typedef struct ip6_fib_show_ctx_t_ {
 520     fib_node_index_t *entries;
 521 } ip6_fib_show_ctx_t;
 522
 523 static int
 524 ip6_fib_table_show_walk (fib_node_index_t fib_entry_index,
 525                          void *arg)
 526 {
 527     ip6_fib_show_ctx_t *ctx = arg;
 528
 529     vec_add1(ctx->entries, fib_entry_index);
 530
 531     return (1);
 532 }
 533
 534 static void
 535 ip6_fib_table_show_all (ip6_fib_t *fib,
 536                         vlib_main_t * vm)
 537 {
 538     fib_node_index_t *fib_entry_index;
 539     ip6_fib_show_ctx_t ctx = {
 540         .entries = NULL,
 541     };
 542
 543     ip6_fib_table_walk(fib->index, ip6_fib_table_show_walk, &ctx);
 544     vec_sort_with_function(ctx.entries, fib_entry_cmp_for_sort);
 545
 546     vec_foreach(fib_entry_index, ctx.entries)
 547     {
 548         vlib_cli_output(vm, "%U",
 549                         format_fib_entry,
 550                         *fib_entry_index,
 551                         FIB_ENTRY_FORMAT_BRIEF);
 552     }
 553
 554     vec_free(ctx.entries);
 555 }
 556
 557 static void
 558 ip6_fib_table_show_one (ip6_fib_t *fib,
 559                         vlib_main_t * vm,
 560                         ip6_address_t *address,
 561                         u32 mask_len,
 562                         int detail)
 563 {
 564     vlib_cli_output(vm, "%U",
 565                     format_fib_entry,
 566                     ip6_fib_table_lookup(fib->index, address, mask_len),
 567                     (detail ?
 568                      FIB_ENTRY_FORMAT_DETAIL2:
 569                      FIB_ENTRY_FORMAT_DETAIL));
 570 }
 571
 572 typedef struct {
 573   u32 fib_index;
 574   u64 count_by_prefix_length[129];
 575 } count_routes_in_fib_at_prefix_length_arg_t;
 576
 577 static void
 578 count_routes_in_fib_at_prefix_length (BVT(clib_bihash_kv) * kvp,
 579                                       void *arg)
 580 {
 581   count_routes_in_fib_at_prefix_length_arg_t * ap = arg;
 582   int mask_width;
 583
 584   if ((kvp->key[2]>>32) != ap->fib_index)
 585     return;
 586
 587   mask_width = kvp->key[2] & 0xFF;
 588
 589   ap->count_by_prefix_length[mask_width]++;
 590 }
 591
 592 static clib_error_t *
 593 ip6_show_fib (vlib_main_t * vm,
 594               unformat_input_t * input,
 595               vlib_cli_command_t * cmd)
 596 {
 597     count_routes_in_fib_at_prefix_length_arg_t _ca, *ca = &_ca;
 598     ip6_main_t * im6 = &ip6_main;
 599     fib_table_t *fib_table;
 600     ip6_fib_t * fib;
 601     int verbose, matching;
 602     ip6_address_t matching_address;
 603     u32 mask_len  = 128;
 604     int table_id = -1, fib_index = ~0;
 605     int detail = 0;
 606
 607     verbose = 1;
 608     matching = 0;
 609
 610     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 611     {
 612         if (unformat (input, "brief")   ||
 613             unformat (input, "summary") ||
 614             unformat (input, "sum"))
 615             verbose = 0;
 616
 617         else if (unformat (input, "detail")   ||
 618                  unformat (input, "det"))
 619             detail = 1;
 620
 621         else if (unformat (input, "%U/%d",
 622                            unformat_ip6_address, &matching_address, &mask_len))
 623             matching = 1;
 624
 625         else if (unformat (input, "%U", unformat_ip6_address, &matching_address))
 626             matching = 1;
 627
 628         else if (unformat (input, "table %d", &table_id))
 629             ;
 630         else if (unformat (input, "index %d", &fib_index))
 631             ;
 632         else
 633             break;
 634     }
 635
 636     pool_foreach (fib_table, im6->fibs,
 637     ({
 638         fib = pool_elt_at_index(im6->v6_fibs, fib_table->ft_index);
 639         if (table_id >= 0 && table_id != (int)fib->table_id)
 640             continue;
 641         if (fib_index != ~0 && fib_index != (int)fib->index)
 642             continue;
 643
 644         vlib_cli_output (vm, "%s, fib_index %d, flow hash: %U",
 645                          fib_table->ft_desc, fib->index,
 646                          format_ip_flow_hash_config, fib->flow_hash_config);
 647
 648         /* Show summary? */
 649         if (! verbose)
 650         {
 651             BVT(clib_bihash) * h = &im6->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash;
 652             int len;
 653
 654             vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
 655
 656             memset (ca, 0, sizeof(*ca));
 657             ca->fib_index = fib->index;
 658
 659             BV(clib_bihash_foreach_key_value_pair)
 660                 (h, count_routes_in_fib_at_prefix_length, ca);
 661
 662             for (len = 128; len >= 0; len--)
 663             {
 664                 if (ca->count_by_prefix_length[len])
 665                     vlib_cli_output (vm, "%=20d%=16lld",
 666                                      len, ca->count_by_prefix_length[len]);
 667             }
 668             continue;
 669         }
 670
 671         if (!matching)
 672         {
 673             ip6_fib_table_show_all(fib, vm);
 674         }
 675         else
 676         {
 677             ip6_fib_table_show_one(fib, vm, &matching_address, mask_len, detail);
 678         }
 679     }));
 680
 681     return 0;
 682 }
 683
 684 /*?
 685  * This command displays the IPv6 FIB Tables (VRF Tables) and the route
 686  * entries for each table.
 687  *
 688  * @note This command will run for a long time when the FIB tables are
 689  * comprised of millions of entries. For those senarios, consider displaying
 690  * in summary mode.
 691  *
 692  * @cliexpar
 693  * @parblock
 694  * Example of how to display all the IPv6 FIB tables:
 695  * @cliexstart{show ip6 fib}
 696  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 697  * @::/0
 698  *   unicast-ip6-chain
 699  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
 700  *     [0] [@0]: dpo-drop ip6
 701  * fe80::/10
 702  *   unicast-ip6-chain
 703  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
 704  *     [0] [@2]: dpo-receive
 705  * ff02::1/128
 706  *   unicast-ip6-chain
 707  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
 708  *     [0] [@2]: dpo-receive
 709  * ff02::2/128
 710  *   unicast-ip6-chain
 711  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
 712  *     [0] [@2]: dpo-receive
 713  * ff02::16/128
 714  *   unicast-ip6-chain
 715  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
 716  *     [0] [@2]: dpo-receive
 717  * ff02::1:ff00:0/104
 718  *   unicast-ip6-chain
 719  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
 720  *     [0] [@2]: dpo-receive
 721  * ipv6-VRF:8, fib_index 1, flow hash: src dst sport dport proto
 722  * @::/0
 723  *   unicast-ip6-chain
 724  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
 725  *     [0] [@0]: dpo-drop ip6
 726  * @::a:1:1:0:4/126
 727  *   unicast-ip6-chain
 728  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
 729  *     [0] [@4]: ipv6-glean: af_packet0
 730  * @::a:1:1:0:7/128
 731  *   unicast-ip6-chain
 732  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
 733  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
 734  * fe80::/10
 735  *   unicast-ip6-chain
 736  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
 737  *     [0] [@2]: dpo-receive
 738  * fe80::fe:3eff:fe3e:9222/128
 739  *   unicast-ip6-chain
 740  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
 741  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
 742  * ff02::1/128
 743  *   unicast-ip6-chain
 744  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
 745  *     [0] [@2]: dpo-receive
 746  * ff02::2/128
 747  *   unicast-ip6-chain
 748  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
 749  *     [0] [@2]: dpo-receive
 750  * ff02::16/128
 751  *   unicast-ip6-chain
 752  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
 753  *     [0] [@2]: dpo-receive
 754  * ff02::1:ff00:0/104
 755  *   unicast-ip6-chain
 756  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
 757  *     [0] [@2]: dpo-receive
 758  * @cliexend
 759  *
 760  * Example of how to display a summary of all IPv6 FIB tables:
 761  * @cliexstart{show ip6 fib summary}
 762  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 763  *     Prefix length         Count
 764  *          128                3
 765  *          104                1
 766  *          10                 1
 767  *           0                 1
 768  * ipv6-VRF:8, fib_index 1, flow hash: src dst sport dport proto
 769  *     Prefix length         Count
 770  *          128                5
 771  *          126                1
 772  *          104                1
 773  *          10                 1
 774  *           0                 1
 775  * @cliexend
 776  * @endparblock
 777  ?*/
 778 /* *INDENT-OFF* */
 779 VLIB_CLI_COMMAND (ip6_show_fib_command, static) = {
 780     .path = "show ip6 fib",
 781     .short_help = "show ip6 fib [summary] [table <table-id>] [index <fib-id>] [<ip6-addr>[/<width>]] [detail]",
 782     .function = ip6_show_fib,
 783 };
 784 /* *INDENT-ON* */