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
 133     fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_IP4, src);
 134
 135     ip4_mtrie_init(&v4_fib->mtrie);
 136
 137     /*
 138      * add the special entries into the new FIB
 139      */
 140     int ii;
 141
 142     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
 143     {
 144         fib_prefix_t prefix = ip4_specials[ii].ift_prefix;
 145
 146         prefix.fp_addr.ip4.data_u32 =
 147             clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32);
 148
 149         fib_table_entry_special_add(fib_table->ft_index,
 150                                     &prefix,
 151                                     ip4_specials[ii].ift_source,
 152                                     ip4_specials[ii].ift_flag);
 153     }
 154
 155     return (fib_table->ft_index);
 156 }
 157
 158 void
 159 ip4_fib_table_destroy (u32 fib_index)
 160 {
 161     fib_table_t *fib_table = pool_elt_at_index(ip4_main.fibs, fib_index);
 162     ip4_fib_t *v4_fib = pool_elt_at_index(ip4_main.v4_fibs, fib_index);
 163     int ii;
 164
 165     /*
 166      * remove all the specials we added when the table was created.
 167      * In reverse order so the default route is last.
 168      */
 169     for (ii = ARRAY_LEN(ip4_specials) - 1; ii >= 0; ii--)
 170     {
 171         fib_prefix_t prefix = ip4_specials[ii].ift_prefix;
 172
 173         prefix.fp_addr.ip4.data_u32 =
 174             clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32);
 175
 176         fib_table_entry_special_remove(fib_table->ft_index,
 177                                        &prefix,
 178                                        ip4_specials[ii].ift_source);
 179     }
 180
 181     /*
 182      * validate no more routes.
 183      */
 184     ASSERT(0 == fib_table->ft_total_route_counts);
 185     FOR_EACH_FIB_SOURCE(ii)
 186     {
 187         ASSERT(0 == fib_table->ft_src_route_counts[ii]);
 188     }
 189
 190     if (~0 != fib_table->ft_table_id)
 191     {
 192         hash_unset (ip4_main.fib_index_by_table_id, fib_table->ft_table_id);
 193     }
 194
 195     ip4_mtrie_free(&v4_fib->mtrie);
 196
 197     pool_put(ip4_main.v4_fibs, v4_fib);
 198     pool_put(ip4_main.fibs, fib_table);
 199 }
 200
 201
 202 u32
 203 ip4_fib_table_find_or_create_and_lock (u32 table_id,
 204                                        fib_source_t src)
 205 {
 206     u32 index;
 207
 208     index = ip4_fib_index_from_table_id(table_id);
 209     if (~0 == index)
 210         return ip4_create_fib_with_table_id(table_id, src);
 211
 212     fib_table_lock(index, FIB_PROTOCOL_IP4, src);
 213
 214     return (index);
 215 }
 216
 217 u32
 218 ip4_fib_table_create_and_lock (fib_source_t src)
 219 {
 220     return (ip4_create_fib_with_table_id(~0, src));
 221 }
 222
 223 u32
 224 ip4_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
 225 {
 226     if (sw_if_index >= vec_len(ip4_main.fib_index_by_sw_if_index))
 227     {
 228         /*
 229          * This is the case for interfaces that are not yet mapped to
 230          * a IP table
 231          */
 232         return (~0);
 233     }
 234     return (ip4_main.fib_index_by_sw_if_index[sw_if_index]);
 235 }
 236
 237 /*
 238  * ip4_fib_table_lookup_exact_match
 239  *
 240  * Exact match prefix lookup
 241  */
 242 fib_node_index_t
 243 ip4_fib_table_lookup_exact_match (const ip4_fib_t *fib,
 244                                   const ip4_address_t *addr,
 245                                   u32 len)
 246 {
 247     uword * hash, * result;
 248     u32 key;
 249
 250     hash = fib->fib_entry_by_dst_address[len];
 251     key  = (addr->data_u32 & ip4_main.fib_masks[len]);
 252
 253     result = hash_get(hash, key);
 254
 255     if (NULL != result) {
 256         return (result[0]);
 257     }
 258     return (FIB_NODE_INDEX_INVALID);
 259 }
 260
 261 /*
 262  * ip4_fib_table_lookup_adj
 263  *
 264  * Longest prefix match
 265  */
 266 index_t
 267 ip4_fib_table_lookup_lb (ip4_fib_t *fib,
 268                          const ip4_address_t *addr)
 269 {
 270     fib_node_index_t fei;
 271
 272     fei = ip4_fib_table_lookup(fib, addr, 32);
 273
 274     if (FIB_NODE_INDEX_INVALID != fei)
 275     {
 276         const dpo_id_t *dpo;
 277
 278         dpo = fib_entry_contribute_ip_forwarding(fei);
 279
 280         return (dpo->dpoi_index);
 281     }
 282     return (INDEX_INVALID);
 283 }
 284
 285 /*
 286  * ip4_fib_table_lookup
 287  *
 288  * Longest prefix match
 289  */
 290 fib_node_index_t
 291 ip4_fib_table_lookup (const ip4_fib_t *fib,
 292                       const ip4_address_t *addr,
 293                       u32 len)
 294 {
 295     uword * hash, * result;
 296     i32 mask_len;
 297     u32 key;
 298
 299     for (mask_len = len; mask_len >= 0; mask_len--)
 300     {
 301         hash = fib->fib_entry_by_dst_address[mask_len];
 302         key = (addr->data_u32 & ip4_main.fib_masks[mask_len]);
 303
 304         result = hash_get (hash, key);
 305
 306         if (NULL != result) {
 307             return (result[0]);
 308         }
 309     }
 310     return (FIB_NODE_INDEX_INVALID);
 311 }
 312
 313 void
 314 ip4_fib_table_entry_insert (ip4_fib_t *fib,
 315                             const ip4_address_t *addr,
 316                             u32 len,
 317                             fib_node_index_t fib_entry_index)
 318 {
 319     uword * hash, * result;
 320     u32 key;
 321
 322     key = (addr->data_u32 & ip4_main.fib_masks[len]);
 323     hash = fib->fib_entry_by_dst_address[len];
 324     result = hash_get (hash, key);
 325
 326     if (NULL == result) {
 327         /*
 328          * adding a new entry
 329          */
 330         uword *old_heap;
 331         old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);
 332
 333         if (NULL == hash) {
 334             hash = hash_create (32 /* elts */, sizeof (uword));
 335             hash_set_flags (hash, HASH_FLAG_NO_AUTO_SHRINK);
 336
 337         }
 338         hash = hash_set(hash, key, fib_entry_index);
 339         fib->fib_entry_by_dst_address[len] = hash;
 340         clib_mem_set_heap (old_heap);
 341     }
 342     else
 343     {
 344         ASSERT(0);
 345     }
 346 }
 347
 348 void
 349 ip4_fib_table_entry_remove (ip4_fib_t *fib,
 350                             const ip4_address_t *addr,
 351                             u32 len)
 352 {
 353     uword * hash, * result;
 354     u32 key;
 355
 356     key = (addr->data_u32 & ip4_main.fib_masks[len]);
 357     hash = fib->fib_entry_by_dst_address[len];
 358     result = hash_get (hash, key);
 359
 360     if (NULL == result)
 361     {
 362         /*
 363          * removing a non-existant entry. i'll allow it.
 364          */
 365     }
 366     else
 367     {
 368         uword *old_heap;
 369
 370         old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);
 371         hash_unset(hash, key);
 372         clib_mem_set_heap (old_heap);
 373     }
 374
 375     fib->fib_entry_by_dst_address[len] = hash;
 376 }
 377
 378 void
 379 ip4_fib_table_fwding_dpo_update (ip4_fib_t *fib,
 380                                  const ip4_address_t *addr,
 381                                  u32 len,
 382                                  const dpo_id_t *dpo)
 383 {
 384     ip4_fib_mtrie_route_add(&fib->mtrie, addr, len, dpo->dpoi_index);
 385 }
 386
 387 void
 388 ip4_fib_table_fwding_dpo_remove (ip4_fib_t *fib,
 389                                  const ip4_address_t *addr,
 390                                  u32 len,
 391                                  const dpo_id_t *dpo,
 392                                  u32 cover_index)
 393 {
 394     fib_prefix_t cover_prefix = {
 395         .fp_len = 0,
 396     };
 397     const dpo_id_t *cover_dpo;
 398
 399     /*
 400      * We need to pass the MTRIE the LB index and address length of the
 401      * covering prefix, so it can fill the plys with the correct replacement
 402      * for the entry being removed
 403      */
 404     fib_entry_get_prefix(cover_index, &cover_prefix);
 405     cover_dpo = fib_entry_contribute_ip_forwarding(cover_index);
 406
 407     ip4_fib_mtrie_route_del(&fib->mtrie,
 408                             addr, len, dpo->dpoi_index,
 409                             cover_prefix.fp_len,
 410                             cover_dpo->dpoi_index);
 411 }
 412
 413 void
 414 ip4_fib_table_walk (ip4_fib_t *fib,
 415                     fib_table_walk_fn_t fn,
 416                     void *ctx)
 417 {
 418     fib_prefix_t root = {
 419         .fp_proto = FIB_PROTOCOL_IP4,
 420         // address and length default to all 0
 421     };
 422
 423     /*
 424      * A full tree walk is the dengenerate case of a sub-tree from
 425      * the very root
 426      */
 427     return (ip4_fib_table_sub_tree_walk(fib, &root, fn, ctx));
 428 }
 429
 430 void
 431 ip4_fib_table_sub_tree_walk (ip4_fib_t *fib,
 432                              const fib_prefix_t *root,
 433                              fib_table_walk_fn_t fn,
 434                              void *ctx)
 435 {
 436     fib_prefix_t *sub_trees = NULL;
 437     int i;
 438
 439     /*
 440      * There is no efficent way to walk this array of hash tables.
 441      * so we walk each table with a mask length greater than and equal to
 442      * the required root and check it is covered by the root.
 443      */
 444     for (i = root->fp_len;
 445          i < ARRAY_LEN (fib->fib_entry_by_dst_address);
 446          i++)
 447     {
 448         uword * hash = fib->fib_entry_by_dst_address[i];
 449
 450         if (NULL != hash)
 451         {
 452             ip4_address_t key;
 453             hash_pair_t * p;
 454
 455             hash_foreach_pair (p, hash,
 456             ({
 457                 key.as_u32 = p->key;
 458                 if (ip4_destination_matches_route(&ip4_main,
 459                                                   &key,
 460                                                   &root->fp_addr.ip4,
 461                                                   root->fp_len))
 462                 {
 463                     const fib_prefix_t *sub_tree;
 464                     int skip = 0;
 465
 466                     /*
 467                      * exclude sub-trees the walk does not want to explore
 468                      */
 469                     vec_foreach(sub_tree, sub_trees)
 470                     {
 471                         if (ip4_destination_matches_route(&ip4_main,
 472                                                           &key,
 473                                                           &sub_tree->fp_addr.ip4,
 474                                                           sub_tree->fp_len))
 475                         {
 476                             skip = 1;
 477                             break;
 478                         }
 479                     }
 480
 481                     if (!skip)
 482                     {
 483                         switch (fn(p->value[0], ctx))
 484                         {
 485                         case FIB_TABLE_WALK_CONTINUE:
 486                             break;
 487                         case FIB_TABLE_WALK_SUB_TREE_STOP: {
 488                             fib_prefix_t pfx = {
 489                                 .fp_proto = FIB_PROTOCOL_IP4,
 490                                 .fp_len = i,
 491                                 .fp_addr.ip4 = key,
 492                             };
 493                             vec_add1(sub_trees, pfx);
 494                             break;
 495                         }
 496                         case FIB_TABLE_WALK_STOP:
 497                             goto done;
 498                         }
 499                     }
 500                 }
 501             }));
 502         }
 503     }
 504 done:
 505     vec_free(sub_trees);
 506     return;
 507 }
 508
 509 /**
 510  * Walk show context
 511  */
 512 typedef struct ip4_fib_show_walk_ctx_t_
 513 {
 514     fib_node_index_t *ifsw_indicies;
 515 } ip4_fib_show_walk_ctx_t;
 516
 517 static fib_table_walk_rc_t
 518 ip4_fib_show_walk_cb (fib_node_index_t fib_entry_index,
 519                       void *arg)
 520 {
 521     ip4_fib_show_walk_ctx_t *ctx = arg;
 522
 523     vec_add1(ctx->ifsw_indicies, fib_entry_index);
 524
 525     return (FIB_TABLE_WALK_CONTINUE);
 526 }
 527
 528 static void
 529 ip4_fib_table_show_all (ip4_fib_t *fib,
 530                         vlib_main_t * vm)
 531 {
 532     ip4_fib_show_walk_ctx_t ctx = {
 533         .ifsw_indicies = NULL,
 534     };
 535     fib_node_index_t *fib_entry_index;
 536
 537     ip4_fib_table_walk(fib, ip4_fib_show_walk_cb, &ctx);
 538     vec_sort_with_function(ctx.ifsw_indicies,
 539                            fib_entry_cmp_for_sort);
 540
 541     vec_foreach(fib_entry_index, ctx.ifsw_indicies)
 542     {
 543         vlib_cli_output(vm, "%U",
 544                         format_fib_entry,
 545                         *fib_entry_index,
 546                         FIB_ENTRY_FORMAT_BRIEF);
 547     }
 548
 549     vec_free(ctx.ifsw_indicies);
 550 }
 551
 552 static void
 553 ip4_fib_table_show_one (ip4_fib_t *fib,
 554                         vlib_main_t * vm,
 555                         ip4_address_t *address,
 556                         u32 mask_len,
 557                         int detail)
 558 {
 559     vlib_cli_output(vm, "%U",
 560                     format_fib_entry,
 561                     ip4_fib_table_lookup(fib, address, mask_len),
 562                     (detail ?
 563                      FIB_ENTRY_FORMAT_DETAIL2 :
 564                      FIB_ENTRY_FORMAT_DETAIL));
 565 }
 566
 567 u8 *
 568 format_ip4_fib_table_memory (u8 * s, va_list * args)
 569 {
 570     s = format(s, "%=30s %=6d %=8ld\n",
 571                "IPv4 unicast",
 572                pool_elts(ip4_main.fibs),
 573                mheap_bytes(ip4_main.mtrie_mheap));
 574
 575     return (s);
 576 }
 577
 578 static clib_error_t *
 579 ip4_show_fib (vlib_main_t * vm,
 580               unformat_input_t * input,
 581               vlib_cli_command_t * cmd)
 582 {
 583     ip4_main_t * im4 = &ip4_main;
 584     fib_table_t * fib_table;
 585     u64 total_mtrie_memory, total_hash_memory;
 586     int verbose, matching, mtrie, memory;
 587     ip4_address_t matching_address;
 588     u32 matching_mask = 32;
 589     int i, table_id = -1, fib_index = ~0;
 590     int detail = 0;
 591
 592     verbose = 1;
 593     matching = mtrie = memory = 0;
 594     total_hash_memory = total_mtrie_memory = 0;
 595
 596     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 597     {
 598         if (unformat (input, "brief") || unformat (input, "summary")
 599             || unformat (input, "sum"))
 600             verbose = 0;
 601
 602         else if (unformat (input, "detail") || unformat (input, "det"))
 603             detail = 1;
 604
 605         else if (unformat (input, "mtrie"))
 606             mtrie = 1;
 607
 608         else if (unformat (input, "mem") ||
 609                  unformat (input, "memory"))
 610             memory = 1;
 611
 612         else if (unformat (input, "%U/%d",
 613                            unformat_ip4_address, &matching_address, &matching_mask))
 614             matching = 1;
 615
 616         else if (unformat (input, "%U", unformat_ip4_address, &matching_address))
 617             matching = 1;
 618
 619         else if (unformat (input, "table %d", &table_id))
 620             ;
 621         else if (unformat (input, "index %d", &fib_index))
 622             ;
 623         else
 624             break;
 625     }
 626
 627     pool_foreach (fib_table, im4->fibs,
 628     ({
 629         ip4_fib_t *fib = pool_elt_at_index(im4->v4_fibs, fib_table->ft_index);
 630         fib_source_t source;
 631         u8 *s = NULL;
 632
 633         if (table_id >= 0 && table_id != (int)fib->table_id)
 634             continue;
 635         if (fib_index != ~0 && fib_index != (int)fib->index)
 636             continue;
 637
 638         if (memory)
 639         {
 640             uword mtrie_size, hash_size;
 641
 642             mtrie_size = ip4_fib_mtrie_memory_usage(&fib->mtrie);
 643             hash_size = 0;
 644
 645             for (i = 0; i < ARRAY_LEN (fib->fib_entry_by_dst_address); i++)
 646             {
 647                 uword * hash = fib->fib_entry_by_dst_address[i];
 648                 if (NULL != hash)
 649                 {
 650                     hash_size += hash_bytes(hash);
 651                 }
 652             }
 653             if (verbose)
 654                 vlib_cli_output (vm, "%U mtrie:%d hash:%d",
 655                                  format_fib_table_name, fib->index,
 656                                  FIB_PROTOCOL_IP4,
 657                                  mtrie_size,
 658                                  hash_size);
 659             total_mtrie_memory += mtrie_size;
 660             total_hash_memory += hash_size;
 661             continue;
 662         }
 663
 664         s = format(s, "%U, fib_index:%d, flow hash:[%U] locks:[",
 665                    format_fib_table_name, fib->index,
 666                    FIB_PROTOCOL_IP4,
 667                    fib->index,
 668                    format_ip_flow_hash_config,
 669                    fib_table->ft_flow_hash_config);
 670         FOR_EACH_FIB_SOURCE(source)
 671         {
 672             if (0 != fib_table->ft_locks[source])
 673             {
 674                 s = format(s, "%U:%d, ",
 675                            format_fib_source, source,
 676                            fib_table->ft_locks[source]);
 677             }
 678         }
 679         s = format (s, "]");
 680         vlib_cli_output (vm, "%v", s);
 681         vec_free(s);
 682
 683         /* Show summary? */
 684         if (mtrie)
 685         {
 686             vlib_cli_output (vm, "%U", format_ip4_fib_mtrie, &fib->mtrie, verbose);
 687             continue;
 688         }
 689         if (! verbose)
 690         {
 691             vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
 692             for (i = 0; i < ARRAY_LEN (fib->fib_entry_by_dst_address); i++)
 693             {
 694                 uword * hash = fib->fib_entry_by_dst_address[i];
 695                 uword n_elts = hash_elts (hash);
 696                 if (n_elts > 0)
 697                     vlib_cli_output (vm, "%20d%16d", i, n_elts);
 698             }
 699             continue;
 700         }
 701
 702         if (!matching)
 703         {
 704             ip4_fib_table_show_all(fib, vm);
 705         }
 706         else
 707         {
 708             ip4_fib_table_show_one(fib, vm, &matching_address,
 709                                    matching_mask, detail);
 710         }
 711     }));
 712
 713     if (memory)
 714         vlib_cli_output (vm, "totals: mtrie:%ld hash:%ld all:%ld",
 715                          total_mtrie_memory,
 716                          total_hash_memory,
 717                          total_mtrie_memory + total_hash_memory);
 718
 719     return 0;
 720 }
 721
 722 /*?
 723  * This command displays the IPv4 FIB Tables (VRF Tables) and the route
 724  * entries for each table.
 725  *
 726  * @note This command will run for a long time when the FIB tables are
 727  * comprised of millions of entries. For those senarios, consider displaying
 728  * a single table or summary mode.
 729  *
 730  * @cliexpar
 731  * Example of how to display all the IPv4 FIB tables:
 732  * @cliexstart{show ip fib}
 733  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 734  * 0.0.0.0/0
 735  *   unicast-ip4-chain
 736  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
 737  *     [0] [@0]: dpo-drop ip6
 738  * 0.0.0.0/32
 739  *   unicast-ip4-chain
 740  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
 741  *     [0] [@0]: dpo-drop ip6
 742  * 6.0.1.2/32
 743  *   unicast-ip4-chain
 744  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
 745  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
 746  * 7.0.0.1/32
 747  *   unicast-ip4-chain
 748  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
 749  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 750  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 751  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
 752  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
 753  * 224.0.0.0/8
 754  *   unicast-ip4-chain
 755  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
 756  *     [0] [@0]: dpo-drop ip6
 757  * 240.0.0.0/8
 758  *   unicast-ip4-chain
 759  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
 760  *     [0] [@0]: dpo-drop ip6
 761  * 255.255.255.255/32
 762  *   unicast-ip4-chain
 763  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
 764  *     [0] [@0]: dpo-drop ip6
 765  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 766  * 0.0.0.0/0
 767  *   unicast-ip4-chain
 768  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
 769  *     [0] [@0]: dpo-drop ip6
 770  * 0.0.0.0/32
 771  *   unicast-ip4-chain
 772  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
 773  *     [0] [@0]: dpo-drop ip6
 774  * 172.16.1.0/24
 775  *   unicast-ip4-chain
 776  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
 777  *     [0] [@4]: ipv4-glean: af_packet0
 778  * 172.16.1.1/32
 779  *   unicast-ip4-chain
 780  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
 781  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
 782  * 172.16.1.2/32
 783  *   unicast-ip4-chain
 784  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
 785  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
 786  * 172.16.2.0/24
 787  *   unicast-ip4-chain
 788  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
 789  *     [0] [@4]: ipv4-glean: af_packet1
 790  * 172.16.2.1/32
 791  *   unicast-ip4-chain
 792  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
 793  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
 794  * 224.0.0.0/8
 795  *   unicast-ip4-chain
 796  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
 797  *     [0] [@0]: dpo-drop ip6
 798  * 240.0.0.0/8
 799  *   unicast-ip4-chain
 800  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
 801  *     [0] [@0]: dpo-drop ip6
 802  * 255.255.255.255/32
 803  *   unicast-ip4-chain
 804  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
 805  *     [0] [@0]: dpo-drop ip6
 806  * @cliexend
 807  * Example of how to display a single IPv4 FIB table:
 808  * @cliexstart{show ip fib table 7}
 809  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 810  * 0.0.0.0/0
 811  *   unicast-ip4-chain
 812  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
 813  *     [0] [@0]: dpo-drop ip6
 814  * 0.0.0.0/32
 815  *   unicast-ip4-chain
 816  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
 817  *     [0] [@0]: dpo-drop ip6
 818  * 172.16.1.0/24
 819  *   unicast-ip4-chain
 820  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
 821  *     [0] [@4]: ipv4-glean: af_packet0
 822  * 172.16.1.1/32
 823  *   unicast-ip4-chain
 824  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
 825  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
 826  * 172.16.1.2/32
 827  *   unicast-ip4-chain
 828  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
 829  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
 830  * 172.16.2.0/24
 831  *   unicast-ip4-chain
 832  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
 833  *     [0] [@4]: ipv4-glean: af_packet1
 834  * 172.16.2.1/32
 835  *   unicast-ip4-chain
 836  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
 837  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
 838  * 224.0.0.0/8
 839  *   unicast-ip4-chain
 840  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
 841  *     [0] [@0]: dpo-drop ip6
 842  * 240.0.0.0/8
 843  *   unicast-ip4-chain
 844  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
 845  *     [0] [@0]: dpo-drop ip6
 846  * 255.255.255.255/32
 847  *   unicast-ip4-chain
 848  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
 849  *     [0] [@0]: dpo-drop ip6
 850  * @cliexend
 851  * Example of how to display a summary of all IPv4 FIB tables:
 852  * @cliexstart{show ip fib summary}
 853  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
 854  *     Prefix length         Count
 855  *                    0               1
 856  *                    8               2
 857  *                   32               4
 858  * ipv4-VRF:7, fib_index 1, flow hash: src dst sport dport proto
 859  *     Prefix length         Count
 860  *                    0               1
 861  *                    8               2
 862  *                   24               2
 863  *                   32               4
 864  * @cliexend
 865  ?*/
 866 /* *INDENT-OFF* */
 867 VLIB_CLI_COMMAND (ip4_show_fib_command, static) = {
 868     .path = "show ip fib",
 869     .short_help = "show ip fib [summary] [table <table-id>] [index <fib-id>] [<ip4-addr>[/<mask>]] [mtrie] [detail]",
 870     .function = ip4_show_fib,
 871 };
 872 /* *INDENT-ON* */