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