src/vnet/fib/ip4_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/fib_table.h>
  17 #include <vnet/fib/fib_entry.h>
  18 #include <vnet/fib/ip4_fib.h>
  19
  20 /*
  21  * A table of pefixes to be added to tables and the sources for them
  22  */
  23 typedef struct ip4_fib_table_special_prefix_t_ {
  24     fib_prefix_t ift_prefix;
  25     fib_source_t ift_source;
  26     fib_entry_flag_t ift_flag;
  27 } ip4_fib_table_special_prefix_t;
  28
  29 static const ip4_fib_table_special_prefix_t ip4_specials[] = {
  30     {
  31         /* 0.0.0.0/0*/
  32         .ift_prefix = {
  33             .fp_addr = {
  34                 .ip4.data_u32 = 0,
  35             },
  36             .fp_len  = 0,
  37             .fp_proto = FIB_PROTOCOL_IP4,
  38         },
  39         .ift_source = FIB_SOURCE_DEFAULT_ROUTE,
  40         .ift_flag   = FIB_ENTRY_FLAG_DROP,
  41     },
  42     {
  43         /* 0.0.0.0/32*/
  44         .ift_prefix = {
  45             .fp_addr = {
  46                 .ip4.data_u32 = 0,
  47             },
  48             .fp_len  = 32,
  49             .fp_proto = FIB_PROTOCOL_IP4,
  50         },
  51         .ift_source = FIB_SOURCE_DEFAULT_ROUTE,
  52         .ift_flag   = FIB_ENTRY_FLAG_DROP,
  53     },
  54     {
  55         /*
  56          * 240.0.0.0/4
  57          * drop class E
  58          */
  59         .ift_prefix = {
  60             .fp_addr = {
  61                 .ip4.data_u32 = 0xf0000000,
  62             },
  63             .fp_len   = 4,
  64             .fp_proto = FIB_PROTOCOL_IP4,
  65         },
  66         .ift_source = FIB_SOURCE_SPECIAL,
  67         .ift_flag   = FIB_ENTRY_FLAG_DROP,
  68
  69     },
  70     {
  71         /*
  72          * 224.0.0.0/4
  73          * drop all mcast
  74          */
  75         .ift_prefix = {
  76             .fp_addr = {
  77                 .ip4.data_u32 = 0xe0000000,
  78             },
  79             .fp_len   = 4,
  80             .fp_proto = FIB_PROTOCOL_IP4,
  81         },
  82         .ift_source = FIB_SOURCE_SPECIAL,
  83         .ift_flag    = FIB_ENTRY_FLAG_DROP,
  84     },
  85     {
  86         /*
  87          * 255.255.255.255/32
  88          * drop, but we'll allow it to be usurped by the likes of DHCP
  89          */
  90         .ift_prefix = {
  91             .fp_addr = {
  92                 .ip4.data_u32 = 0xffffffff,
  93             },
  94             .fp_len   = 32,
  95             .fp_proto = FIB_PROTOCOL_IP4,
  96         },
  97         .ift_source = FIB_SOURCE_DEFAULT_ROUTE,
  98         .ift_flag   = FIB_ENTRY_FLAG_DROP,
  99     }
 100 };
 101
 102
 103 static u32
 104 ip4_create_fib_with_table_id (u32 table_id,
 105                               fib_source_t src)
 106 {
 107     fib_table_t *fib_table;
 108     ip4_fib_t *v4_fib;
 109     void *old_heap;
 110
 111     pool_get(ip4_main.fibs, fib_table);
 112     memset(fib_table, 0, sizeof(*fib_table));
 113
 114     old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);
 115     pool_get_aligned(ip4_main.v4_fibs, v4_fib, CLIB_CACHE_LINE_BYTES);
 116     clib_mem_set_heap (old_heap);
 117
 118     ASSERT((fib_table - ip4_main.fibs) ==
 119            (v4_fib - ip4_main.v4_fibs));
 120
 121     fib_table->ft_proto = FIB_PROTOCOL_IP4;
 122     fib_table->ft_index =
 123         v4_fib->index =
 124             (fib_table - ip4_main.fibs);
 125
 126     hash_set (ip4_main.fib_index_by_table_id, table_id, fib_table->ft_index);
 127
 128     fib_table->ft_table_id =
 129         v4_fib->table_id =
 130             table_id;
 131     fib_table->ft_flow_hash_config = IP_FLOW_HASH_DEFAULT;
 132     v4_fib->fwd_classify_table_index = ~0;
 133     v4_fib->rev_classify_table_index = ~0;
 134
 135     fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_IP4, src);
 136
 137     ip4_mtrie_init(&v4_fib->mtrie);
 138
 139     /*
 140      * add the special entries into the new FIB
 141      */
 142     int ii;
 143
 144     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
 145     {
 146         fib_prefix_t prefix = ip4_specials[ii].ift_prefix;
 147
 148         prefix.fp_addr.ip4.data_u32 =
 149             clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32);
 150
 151         fib_table_entry_special_add(fib_table->ft_index,
 152                                     &prefix,
 153                                     ip4_specials[ii].ift_source,
 154                                     ip4_specials[ii].ift_flag);
 155     }
 156
 157     return (fib_table->ft_index);
 158 }
 159
 160 void
 161 ip4_fib_table_destroy (u32 fib_index)
 162 {
 163     fib_table_t *fib_table = pool_elt_at_index(ip4_main.fibs, fib_index);
 164     ip4_fib_t *v4_fib = pool_elt_at_index(ip4_main.v4_fibs, fib_index);
 165     int ii;
 166
 167     /*
 168      * remove all the specials we added when the table was created.
 169      * In reverse order so the default route is last.
 170      */
 171     for (ii = ARRAY_LEN(ip4_specials) - 1; ii >= 0; ii--)
 172     {
 173         fib_prefix_t prefix = ip4_specials[ii].ift_prefix;
 174
 175         prefix.fp_addr.ip4.data_u32 =
 176             clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32);
 177
 178         fib_table_entry_special_remove(fib_table->ft_index,
 179                                        &prefix,
 180                                        ip4_specials[ii].ift_source);
 181     }
 182
 183     /*
 184      * validate no more routes.
 185      */
 186     ASSERT(0 == fib_table->ft_total_route_counts);
 187     FOR_EACH_FIB_SOURCE(ii)
 188     {
 189         ASSERT(0 == fib_table->ft_src_route_counts[ii]);
 190     }
 191
 192     if (~0 != fib_table->ft_table_id)
 193     {
 194         hash_unset (ip4_main.fib_index_by_table_id, fib_table->ft_table_id);
 195     }
 196
 197     ip4_mtrie_free(&v4_fib->mtrie);
 198
 199     pool_put(ip4_main.v4_fibs, v4_fib);
 200     pool_put(ip4_main.fibs, fib_table);
 201 }
 202
 203
 204 u32
 205 ip4_fib_table_find_or_create_and_lock (u32 table_id,
 206                                        fib_source_t src)
 207 {
 208     u32 index;
 209
 210     index = ip4_fib_index_from_table_id(table_id);
 211     if (~0 == index)
 212         return ip4_create_fib_with_table_id(table_id, src);
 213
 214     fib_table_lock(index, FIB_PROTOCOL_IP4, src);
 215
 216     return (index);
 217 }
 218
 219 u32
 220 ip4_fib_table_create_and_lock (fib_source_t src)
 221 {
 222     return (ip4_create_fib_with_table_id(~0, src));
 223 }
 224
 225 u32
 226 ip4_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
 227 {
 228     if (sw_if_index >= vec_len(ip4_main.fib_index_by_sw_if_index))
 229     {
 230         /*
 231          * This is the case for interfaces that are not yet mapped to
 232          * a IP table
 233          */
 234         return (~0);
 235     }
 236     return (ip4_main.fib_index_by_sw_if_index[sw_if_index]);
 237 }
 238
 239 /*
 240  * ip4_fib_table_lookup_exact_match
 241  *
 242  * Exact match prefix lookup
 243  */
 244 fib_node_index_t
 245 ip4_fib_table_lookup_exact_match (const ip4_fib_t *fib,
 246                                   const ip4_address_t *addr,
 247                                   u32 len)
 248 {
 249     uword * hash, * result;
 250     u32 key;
 251
 252     hash = fib->fib_entry_by_dst_address[len];
 253     key  = (addr->data_u32 & ip4_main.fib_masks[len]);
 254
 255     result = hash_get(hash, key);
 256
 257     if (NULL != result) {
 258         return (result[0]);
 259     }
 260     return (FIB_NODE_INDEX_INVALID);
 261 }
 262
 263 /*
 264  * ip4_fib_table_lookup_adj
 265  *
 266  * Longest prefix match
 267  */
 268 index_t
 269 ip4_fib_table_lookup_lb (ip4_fib_t *fib,
 270                          const ip4_address_t *addr)
 271 {
 272     fib_node_index_t fei;
 273
 274     fei = ip4_fib_table_lookup(fib, addr, 32);
 275
 276     if (FIB_NODE_INDEX_INVALID != fei)
 277     {
 278         const dpo_id_t *dpo;
 279
 280         dpo = fib_entry_contribute_ip_forwarding(fei);
 281
 282         return (dpo->dpoi_index);
 283     }
 284     return (INDEX_INVALID);
 285 }
 286
 287 /*
 288  * ip4_fib_table_lookup
 289  *
 290  * Longest prefix match
 291  */
 292 fib_node_index_t
 293 ip4_fib_table_lookup (const ip4_fib_t *fib,
 294                       const ip4_address_t *addr,
 295                       u32 len)
 296 {
 297     uword * hash, * result;
 298     i32 mask_len;
 299     u32 key;
 300
 301     for (mask_len = len; mask_len >= 0; mask_len--)
 302     {
 303         hash = fib->fib_entry_by_dst_address[mask_len];
 304         key = (addr->data_u32 & ip4_main.fib_masks[mask_len]);
 305
 306         result = hash_get (hash, key);
 307
 308         if (NULL != result) {
 309             return (result[0]);
 310         }
 311     }
 312     return (FIB_NODE_INDEX_INVALID);
 313 }
 314
 315 void
 316 ip4_fib_table_entry_insert (ip4_fib_t *fib,
 317                             const ip4_address_t *addr,
 318                             u32 len,
 319                             fib_node_index_t fib_entry_index)
 320 {
 321     uword * hash, * result;
 322     u32 key;
 323
 324     key = (addr->data_u32 & ip4_main.fib_masks[len]);
 325     hash = fib->fib_entry_by_dst_address[len];
 326     result = hash_get (hash, key);
 327
 328     if (NULL == result) {
 329         /*
 330          * adding a new entry
 331          */
 332         uword *old_heap;
 333         old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);
 334
 335         if (NULL == hash) {
 336             hash = hash_create (32 /* elts */, sizeof (uword));
 337             hash_set_flags (hash, HASH_FLAG_NO_AUTO_SHRINK);
 338
 339         }
 340         hash = hash_set(hash, key, fib_entry_index);
 341         fib->fib_entry_by_dst_address[len] = hash;
 342         clib_mem_set_heap (old_heap);
 343     }
 344     else
 345     {
 346         ASSERT(0);
 347     }
 348 }
 349
 350 void
 351 ip4_fib_table_entry_remove (ip4_fib_t *fib,
 352                             const ip4_address_t *addr,
 353                             u32 len)
 354 {
 355     uword * hash, * result;
 356     u32 key;
 357
 358     key = (addr->data_u32 & ip4_main.fib_masks[len]);
 359     hash = fib->fib_entry_by_dst_address[len];
 360     result = hash_get (hash, key);
 361
 362     if (NULL == result)
 363     {
 364         /*
 365          * removing a non-existant entry. i'll allow it.
 366          */
 367     }
 368     else
 369     {
 370         uword *old_heap;
 371
 372         old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);
 373         hash_unset(hash, key);
 374         clib_mem_set_heap (old_heap);
 375     }
 376
 377     fib->fib_entry_by_dst_address[len] = hash;
 378 }
 379
 380 void
 381 ip4_fib_table_fwding_dpo_update (ip4_fib_t *fib,
 382                                  const ip4_address_t *addr,
 383                                  u32 len,
 384                                  const dpo_id_t *dpo)
 385 {
 386     ip4_fib_mtrie_route_add(&fib->mtrie, addr, len, dpo->dpoi_index);
 387 }
 388
 389 void
 390 ip4_fib_table_fwding_dpo_remove (ip4_fib_t *fib,
 391                                  const ip4_address_t *addr,
 392                                  u32 len,
 393                                  const dpo_id_t *dpo,
 394                                  u32 cover_index)
 395 {
 396     fib_prefix_t cover_prefix = {
 397         .fp_len = 0,
 398     };
 399     const dpo_id_t *cover_dpo;
 400
 401     /*
 402      * We need to pass the MTRIE the LB index and address length of the
 403      * covering prefix, so it can fill the plys with the correct replacement
 404      * for the entry being removed
 405      */
 406     fib_entry_get_prefix(cover_index, &cover_prefix);
 407     cover_dpo = fib_entry_contribute_ip_forwarding(cover_index);
 408
 409     ip4_fib_mtrie_route_del(&fib->mtrie,
 410                             addr, len, dpo->dpoi_index,
 411                             cover_prefix.fp_len,
 412                             cover_dpo->dpoi_index);
 413 }
 414
 415 void
 416 ip4_fib_table_walk (ip4_fib_t *fib,
 417                     fib_table_walk_fn_t fn,
 418                     void *ctx)
 419 {
 420     fib_prefix_t root = {
 421         .fp_proto = FIB_PROTOCOL_IP4,
 422         // address and length default to all 0
 423     };
 424
 425     /*
 426      * A full tree walk is the dengenerate case of a sub-tree from
 427      * the very root
 428      */
 429     return (ip4_fib_table_sub_tree_walk(fib, &root, fn, ctx));
 430 }
 431
 432 void
 433 ip4_fib_table_sub_tree_walk (ip4_fib_t *fib,
 434                              const fib_prefix_t *root,
 435                              fib_table_walk_fn_t fn,
 436                              void *ctx)
 437 {
 438     fib_prefix_t *sub_trees = NULL;
 439     int i;
 440
 441     /*
 442      * There is no efficent way to walk this array of hash tables.
 443      * so we walk each table with a mask length greater than and equal to
 444      * the required root and check it is covered by the root.
 445      */
 446     for (i = root->fp_len;
 447          i < ARRAY_LEN (fib->fib_entry_by_dst_address);
 448          i++)
 449     {
 450         uword * hash = fib->fib_entry_by_dst_address[i];
 451
 452         if (NULL != hash)
 453         {
 454             ip4_address_t key;
 455             hash_pair_t * p;
 456
 457             hash_foreach_pair (p, hash,
 458             ({
 459                 key.as_u32 = p->key;
 460                 if (ip4_destination_matches_route(&ip4_main,
 461                                                   &key,
 462                                                   &root->fp_addr.ip4,
 463                                                   root->fp_len))
 464                 {
 465                     const fib_prefix_t *sub_tree;
 466                     int skip = 0;
 467
 468                     /*
 469                      * exclude sub-trees the walk does not want to explore
 470                      */
 471                     vec_foreach(sub_tree, sub_trees)
 472                     {
 473                         if (ip4_destination_matches_route(&ip4_main,
 474                                                           &key,
 475                                                           &sub_tree->fp_addr.ip4,
 476                                                           sub_tree->fp_len))
 477                         {
 478                             skip = 1;
 479                             break;
 480                         }
 481                     }
 482
 483                     if (!skip)
 484                     {
 485                         switch (fn(p->value[0], ctx))
 486                         {
 487                         case FIB_TABLE_WALK_CONTINUE:
 488                             break;
 489                         case FIB_TABLE_WALK_SUB_TREE_STOP: {
 490                             fib_prefix_t pfx = {
 491                                 .fp_proto = FIB_PROTOCOL_IP4,
 492                                 .fp_len = i,
 493                                 .fp_addr.ip4 = key,
 494                             };
 495                             vec_add1(sub_trees, pfx);
 496                             break;
 497                         }
 498                         case FIB_TABLE_WALK_STOP:
 499                             goto done;
 500                         }
 501                     }
 502                 }
 503             }));
 504         }
 505     }
 506 done:
 507     vec_free(sub_trees);
 508     return;
 509 }
 510
 511 /**
 512  * Walk show context
 513  */
 514 typedef struct ip4_fib_show_walk_ctx_t_
 515 {
 516     fib_node_index_t *ifsw_indicies;
 517 } ip4_fib_show_walk_ctx_t;
 518
 519 static fib_table_walk_rc_t
 520 ip4_fib_show_walk_cb (fib_node_index_t fib_entry_index,
 521                       void *arg)
 522 {
 523     ip4_fib_show_walk_ctx_t *ctx = arg;
 524
 525     vec_add1(ctx->ifsw_indicies, fib_entry_index);
 526
 527     return (FIB_TABLE_WALK_CONTINUE);
 528 }
 529
 530 static void
 531 ip4_fib_table_show_all (ip4_fib_t *fib,
 532                         vlib_main_t * vm)
 533 {
 534     ip4_fib_show_walk_ctx_t ctx = {
 535         .ifsw_indicies = NULL,
 536     };
 537     fib_node_index_t *fib_entry_index;
 538
 539     ip4_fib_table_walk(fib, ip4_fib_show_walk_cb, &ctx);
 540     vec_sort_with_function(ctx.ifsw_indicies,
 541                            fib_entry_cmp_for_sort);
 542
 543     vec_foreach(fib_entry_index, ctx.ifsw_indicies)
 544     {
 545         vlib_cli_output(vm, "%U",
 546                         format_fib_entry,
 547                         *fib_entry_index,
 548                         FIB_ENTRY_FORMAT_BRIEF);
 549     }
 550
 551     vec_free(ctx.ifsw_indicies);
 552 }
 553
 554 static void
 555 ip4_fib_table_show_one (ip4_fib_t *fib,
 556                         vlib_main_t * vm,
 557                         ip4_address_t *address,
 558                         u32 mask_len,
 559                         int detail)
 560 {
 561     vlib_cli_output(vm, "%U",
 562                     format_fib_entry,
 563                     ip4_fib_table_lookup(fib, address, mask_len),
 564                     (detail ?
 565                      FIB_ENTRY_FORMAT_DETAIL2 :
 566                      FIB_ENTRY_FORMAT_DETAIL));
 567 }
 568
 569 u8 *
 570 format_ip4_fib_table_memory (u8 * s, va_list * args)
 571 {
 572     s = format(s, "%=30s %=6d %=8ld\n",
 573                "IPv4 unicast",
 574                pool_elts(ip4_main.fibs),
 575                mheap_bytes(ip4_main.mtrie_mheap));
 576
 577     return (s);
 578 }
 579
 580 static clib_error_t *
 581 ip4_show_fib (vlib_main_t * vm,
 582               unformat_input_t * input,
 583               vlib_cli_command_t * cmd)
 584 {
 585     ip4_main_t * im4 = &ip4_main;
 586     fib_table_t * fib_table;
 587     u64 total_mtrie_memory, total_hash_memory;
 588     int verbose, matching, mtrie, memory;
 589     ip4_address_t matching_address;
 590     u32 matching_mask = 32;
 591     int i, table_id = -1, fib_index = ~0;
 592     int detail = 0;
 593
 594     verbose = 1;
 595     matching = mtrie = memory = 0;
 596     total_hash_memory = total_mtrie_memory = 0;
 597
 598     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 599     {
 600         if (unformat (input, "brief") || unformat (input, "summary")
 601             || unformat (input, "sum"))
 602             verbose = 0;
 603
 604         else if (unformat (input, "detail") || unformat (input, "det"))
 605             detail = 1;
 606
 607         else if (unformat (input, "mtrie"))
 608             mtrie = 1;
 609
 610         else if (unformat (input, "mem") ||
 611                  unformat (input, "memory"))
 612             memory = 1;
 613
 614         else if (unformat (input, "%U/%d",
 615                            unformat_ip4_address, &matching_address, &matching_mask))
 616             matching = 1;
 617
 618         else if (unformat (input, "%U", unformat_ip4_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, im4->fibs,
 630     ({
 631         ip4_fib_t *fib = pool_elt_at_index(im4->v4_fibs, fib_table->ft_index);
 632         fib_source_t source;
 633         u8 *s = NULL;
 634
 635         if (table_id >= 0 && table_id != (int)fib->table_id)
 636             continue;
 637         if (fib_index != ~0 && fib_index != (int)fib->index)
 638             continue;
 639
 640         if (memory)
 641         {
 642             uword mtrie_size, hash_size;
 643
 644             mtrie_size = ip4_fib_mtrie_memory_usage(&fib->mtrie);
 645             hash_size = 0;
 646
 647             for (i = 0; i < ARRAY_LEN (fib->fib_entry_by_dst_address); i++)
 648             {
 649                 uword * hash = fib->fib_entry_by_dst_address[i];
 650                 if (NULL != hash)
 651                 {
 652                     hash_size += hash_bytes(hash);
 653                 }
 654             }
 655             if (verbose)
 656                 vlib_cli_output (vm, "%U mtrie:%d hash:%d",
 657                                  format_fib_table_name, fib->index,
 658                                  FIB_PROTOCOL_IP4,
 659                                  mtrie_size,
 660                                  hash_size);
 661             total_mtrie_memory += mtrie_size;
 662             total_hash_memory += hash_size;
 663             continue;
 664         }
 665
 666         s = format(s, "%U, fib_index:%d, flow hash:[%U] locks:[",
 667                    format_fib_table_name, fib->index,
 668                    FIB_PROTOCOL_IP4,
 669                    fib->index,
 670                    format_ip_flow_hash_config,
 671                    fib_table->ft_flow_hash_config);
 672         FOR_EACH_FIB_SOURCE(source)
 673         {
 674             if (0 != fib_table->ft_locks[source])
 675             {
 676                 s = format(s, "%U:%d, ",
 677                            format_fib_source, source,
 678                            fib_table->ft_locks[source]);
 679             }
 680         }
 681         s = format (s, "]");
 682         vlib_cli_output (vm, "%v", s);
 683         vec_free(s);
 684
 685         /* Show summary? */
 686         if (mtrie)
 687         {
 688             vlib_cli_output (vm, "%U", format_ip4_fib_mtrie, &fib->mtrie, verbose);
 689             continue;
 690         }
 691         if (! verbose)
 692         {
 693             vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
 694             for (i = 0; i < ARRAY_LEN (fib->fib_entry_by_dst_address); i++)
 695             {
 696                 uword * hash = fib->fib_entry_by_dst_address[i];
 697                 uword n_elts = hash_elts (hash);
 698                 if (n_elts > 0)
 699                     vlib_cli_output (vm, "%20d%16d", i, n_elts);
 700             }
 701             continue;
 702         }
 703
 704         if (!matching)
 705         {
 706             ip4_fib_table_show_all(fib, vm);
 707         }
 708         else
 709         {
 710             ip4_fib_table_show_one(fib, vm, &matching_address,
 711                                    matching_mask, detail);
 712         }
 713     }));
 714
 715     if (memory)
 716         vlib_cli_output (vm, "totals: mtrie:%ld hash:%ld all:%ld",
 717                          total_mtrie_memory,
 718                          total_hash_memory,
 719                          total_mtrie_memory + total_hash_memory);
 720
 721     return 0;
 722 }
 723
 724 /*?
 725  * This command displays the IPv4 FIB Tables (VRF Tables) and the route
 726  * entries for each table.
 727  *
 728  * @note This command will run for a long time when the FIB tables are
 729  * comprised of millions of entries. For those senarios, consider displaying
 730  * a single table or summary mode.
 731  *
 732  * @cliexpar
 733  * Example of how to display all the IPv4 FIB tables:
 734  * @cliexstart{show ip fib}
 735  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 736  * 0.0.0.0/0
 737  *   unicast-ip4-chain
 738  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
 739  *     [0] [@0]: dpo-drop ip6
 740  * 0.0.0.0/32
 741  *   unicast-ip4-chain
 742  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
 743  *     [0] [@0]: dpo-drop ip6
 744  * 6.0.1.2/32
 745  *   unicast-ip4-chain
 746  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
 747  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
 748  * 7.0.0.1/32
 749  *   unicast-ip4-chain
 750  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
 751  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 752  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 753  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 754  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
 755  * 224.0.0.0/8
 756  *   unicast-ip4-chain
 757  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
 758  *     [0] [@0]: dpo-drop ip6
 759  * 240.0.0.0/8
 760  *   unicast-ip4-chain
 761  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
 762  *     [0] [@0]: dpo-drop ip6
 763  * 255.255.255.255/32
 764  *   unicast-ip4-chain
 765  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
 766  *     [0] [@0]: dpo-drop ip6
 767  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 768  * 0.0.0.0/0
 769  *   unicast-ip4-chain
 770  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
 771  *     [0] [@0]: dpo-drop ip6
 772  * 0.0.0.0/32
 773  *   unicast-ip4-chain
 774  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
 775  *     [0] [@0]: dpo-drop ip6
 776  * 172.16.1.0/24
 777  *   unicast-ip4-chain
 778  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
 779  *     [0] [@4]: ipv4-glean: af_packet0
 780  * 172.16.1.1/32
 781  *   unicast-ip4-chain
 782  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
 783  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
 784  * 172.16.1.2/32
 785  *   unicast-ip4-chain
 786  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
 787  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
 788  * 172.16.2.0/24
 789  *   unicast-ip4-chain
 790  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
 791  *     [0] [@4]: ipv4-glean: af_packet1
 792  * 172.16.2.1/32
 793  *   unicast-ip4-chain
 794  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
 795  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
 796  * 224.0.0.0/8
 797  *   unicast-ip4-chain
 798  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
 799  *     [0] [@0]: dpo-drop ip6
 800  * 240.0.0.0/8
 801  *   unicast-ip4-chain
 802  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
 803  *     [0] [@0]: dpo-drop ip6
 804  * 255.255.255.255/32
 805  *   unicast-ip4-chain
 806  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
 807  *     [0] [@0]: dpo-drop ip6
 808  * @cliexend
 809  * Example of how to display a single IPv4 FIB table:
 810  * @cliexstart{show ip fib table 7}
 811  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 812  * 0.0.0.0/0
 813  *   unicast-ip4-chain
 814  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
 815  *     [0] [@0]: dpo-drop ip6
 816  * 0.0.0.0/32
 817  *   unicast-ip4-chain
 818  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
 819  *     [0] [@0]: dpo-drop ip6
 820  * 172.16.1.0/24
 821  *   unicast-ip4-chain
 822  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
 823  *     [0] [@4]: ipv4-glean: af_packet0
 824  * 172.16.1.1/32
 825  *   unicast-ip4-chain
 826  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
 827  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
 828  * 172.16.1.2/32
 829  *   unicast-ip4-chain
 830  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
 831  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
 832  * 172.16.2.0/24
 833  *   unicast-ip4-chain
 834  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
 835  *     [0] [@4]: ipv4-glean: af_packet1
 836  * 172.16.2.1/32
 837  *   unicast-ip4-chain
 838  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
 839  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
 840  * 224.0.0.0/8
 841  *   unicast-ip4-chain
 842  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
 843  *     [0] [@0]: dpo-drop ip6
 844  * 240.0.0.0/8
 845  *   unicast-ip4-chain
 846  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
 847  *     [0] [@0]: dpo-drop ip6
 848  * 255.255.255.255/32
 849  *   unicast-ip4-chain
 850  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
 851  *     [0] [@0]: dpo-drop ip6
 852  * @cliexend
 853  * Example of how to display a summary of all IPv4 FIB tables:
 854  * @cliexstart{show ip fib summary}
 855  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 856  *     Prefix length         Count
 857  *                    0               1
 858  *                    8               2
 859  *                   32               4
 860  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 861  *     Prefix length         Count
 862  *                    0               1
 863  *                    8               2
 864  *                   24               2
 865  *                   32               4
 866  * @cliexend
 867  ?*/
 868 /* *INDENT-OFF* */
 869 VLIB_CLI_COMMAND (ip4_show_fib_command, static) = {
 870     .path = "show ip fib",
 871     .short_help = "show ip fib [summary] [table <table-id>] [index <fib-id>] [<ip4-addr>[/<mask>]] [mtrie] [detail]",
 872     .function = ip4_show_fib,
 873 };
 874 /* *INDENT-ON* */