src/vnet/ip-neighbor/ip_neighbor.c

   1 /*
   2  * src/vnet/ip/ip_neighboor.c: ip neighbor generic handling
   3  *
   4  * Copyright (c) 2018 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vppinfra/llist.h>
  19
  20 #include <vnet/ip-neighbor/ip_neighbor.h>
  21 #include <vnet/ip-neighbor/ip4_neighbor.h>
  22 #include <vnet/ip-neighbor/ip6_neighbor.h>
  23 #include <vnet/ip-neighbor/ip_neighbor_watch.h>
  24
  25 #include <vnet/ip/ip6_ll_table.h>
  26 #include <vnet/ip/ip46_address.h>
  27 #include <vnet/fib/fib_table.h>
  28 #include <vnet/adj/adj_mcast.h>
  29
  30 ip_neighbor_counters_t ip_neighbor_counters[] =
  31 {
  32  [AF_IP4] = {
  33    .ipnc = {
  34      [VLIB_RX] = {
  35         [IP_NEIGHBOR_CTR_REPLY] = {
  36           .name = "arp-rx-replies",
  37           .stat_segment_name = "/net/arp/rx/replies",
  38         },
  39         [IP_NEIGHBOR_CTR_REQUEST] = {
  40           .name = "arp-rx-requests",
  41           .stat_segment_name = "/net/arp/rx/requests",
  42         },
  43         [IP_NEIGHBOR_CTR_GRAT] = {
  44           .name = "arp-rx-gratuitous",
  45           .stat_segment_name = "/net/arp/rx/gratuitous",
  46         },
  47       },
  48       [VLIB_TX] = {
  49         [IP_NEIGHBOR_CTR_REPLY] = {
  50           .name = "arp-tx-replies",
  51           .stat_segment_name = "/net/arp/tx/replies",
  52         },
  53         [IP_NEIGHBOR_CTR_REQUEST] = {
  54           .name = "arp-tx-requests",
  55           .stat_segment_name = "/net/arp/tx/requests",
  56         },
  57         [IP_NEIGHBOR_CTR_GRAT] = {
  58           .name = "arp-tx-gratuitous",
  59           .stat_segment_name = "/net/arp/tx/gratuitous",
  60         },
  61       },
  62             },
  63  },
  64  [AF_IP6] = {
  65    .ipnc = {
  66      [VLIB_RX] = {
  67         [IP_NEIGHBOR_CTR_REPLY] = {
  68           .name = "ip6-nd-rx-replies",
  69           .stat_segment_name = "/net/ip6-nd/rx/replies",
  70         },
  71         [IP_NEIGHBOR_CTR_REQUEST] = {
  72           .name = "ip6-nd-rx-requests",
  73           .stat_segment_name = "/net/ip6-nd/rx/requests",
  74         },
  75         [IP_NEIGHBOR_CTR_GRAT] = {
  76           .name = "ip6-nd-rx-gratuitous",
  77           .stat_segment_name = "/net/ip6-nd/rx/gratuitous",
  78         },
  79       },
  80       [VLIB_TX] = {
  81         [IP_NEIGHBOR_CTR_REPLY] = {
  82           .name = "ip6-nd-tx-replies",
  83           .stat_segment_name = "/net/ip6-nd/tx/replies",
  84         },
  85         [IP_NEIGHBOR_CTR_REQUEST] = {
  86           .name = "ip6-nd-tx-requests",
  87           .stat_segment_name = "/net/ip6-nd/tx/requests",
  88         },
  89         [IP_NEIGHBOR_CTR_GRAT] = {
  90           .name = "ip6-nd-tx-gratuitous",
  91           .stat_segment_name = "/net/ip6-nd/tx/gratuitous",
  92         },
  93       },
  94     },
  95  },
  96 };
  97
  98 /** Pool for All IP neighbors */
  99 static ip_neighbor_t *ip_neighbor_pool;
 100
 101 /** protocol specific lists of time sorted neighbors */
 102 index_t ip_neighbor_list_head[N_AF];
 103
 104 typedef struct ip_neighbor_elt_t_
 105 {
 106   clib_llist_anchor_t ipne_anchor;
 107   index_t ipne_index;
 108 } ip_neighbor_elt_t;
 109
 110 /** Pool of linked list elemeents */
 111 ip_neighbor_elt_t *ip_neighbor_elt_pool;
 112
 113 typedef struct ip_neighbor_db_t_
 114 {
 115   /** per interface hash */
 116   uword **ipndb_hash;
 117   /** per-protocol limit - max number of neighbors*/
 118   u32 ipndb_limit;
 119   /** max age of a neighbor before it's forcibly evicted */
 120   u32 ipndb_age;
 121   /** when the limit is reached and new neighbors are created, should
 122    * we recycle an old one */
 123   bool ipndb_recycle;
 124   /** per-protocol number of elements */
 125   u32 ipndb_n_elts;
 126   /** per-protocol number of elements per-fib-index*/
 127   u32 *ipndb_n_elts_per_fib;
 128 } ip_neighbor_db_t;
 129
 130 static vlib_log_class_t ipn_logger;
 131
 132 /* DBs of neighbours one per AF */
 133 /* *INDENT-OFF* */
 134 static ip_neighbor_db_t ip_neighbor_db[N_AF] = {
 135   [AF_IP4] = {
 136     .ipndb_limit = 50000,
 137     /* Default to not aging and not recycling */
 138     .ipndb_age = 0,
 139     .ipndb_recycle = false,
 140   },
 141   [AF_IP6] = {
 142     .ipndb_limit = 50000,
 143     /* Default to not aging and not recycling */
 144     .ipndb_age = 0,
 145     .ipndb_recycle = false,
 146   }
 147 };
 148 /* *INDENT-ON* */
 149
 150 #define IP_NEIGHBOR_DBG(...)                           \
 151     vlib_log_debug (ipn_logger, __VA_ARGS__);
 152
 153 #define IP_NEIGHBOR_INFO(...)                          \
 154     vlib_log_notice (ipn_logger, __VA_ARGS__);
 155
 156 ip_neighbor_t *
 157 ip_neighbor_get (index_t ipni)
 158 {
 159   if (pool_is_free_index (ip_neighbor_pool, ipni))
 160     return (NULL);
 161
 162   return (pool_elt_at_index (ip_neighbor_pool, ipni));
 163 }
 164
 165 static index_t
 166 ip_neighbor_get_index (const ip_neighbor_t * ipn)
 167 {
 168   return (ipn - ip_neighbor_pool);
 169 }
 170
 171 static void
 172 ip_neighbor_touch (ip_neighbor_t * ipn)
 173 {
 174   ipn->ipn_flags &= ~IP_NEIGHBOR_FLAG_STALE;
 175 }
 176
 177 static bool
 178 ip_neighbor_is_dynamic (const ip_neighbor_t * ipn)
 179 {
 180   return (ipn->ipn_flags & IP_NEIGHBOR_FLAG_DYNAMIC);
 181 }
 182
 183 const ip_address_t *
 184 ip_neighbor_get_ip (const ip_neighbor_t * ipn)
 185 {
 186   return (&ipn->ipn_key->ipnk_ip);
 187 }
 188
 189 ip_address_family_t
 190 ip_neighbor_get_af (const ip_neighbor_t * ipn)
 191 {
 192   return (ip_addr_version (&ipn->ipn_key->ipnk_ip));
 193 }
 194
 195 const mac_address_t *
 196 ip_neighbor_get_mac (const ip_neighbor_t * ipn)
 197 {
 198   return (&ipn->ipn_mac);
 199 }
 200
 201 const u32
 202 ip_neighbor_get_sw_if_index (const ip_neighbor_t * ipn)
 203 {
 204   return (ipn->ipn_key->ipnk_sw_if_index);
 205 }
 206
 207 static void
 208 ip_neighbor_list_remove (ip_neighbor_t * ipn)
 209 {
 210   /* new neighbours, are added to the head of the list, since the
 211    * list is time sorted, newest first */
 212   ip_neighbor_elt_t *elt;
 213
 214   if (~0 != ipn->ipn_elt)
 215     {
 216       elt = pool_elt_at_index (ip_neighbor_elt_pool, ipn->ipn_elt);
 217
 218       clib_llist_remove (ip_neighbor_elt_pool, ipne_anchor, elt);
 219
 220       ipn->ipn_elt = ~0;
 221     }
 222 }
 223
 224 static void
 225 ip_neighbor_refresh (ip_neighbor_t * ipn)
 226 {
 227   /* new neighbours, are added to the head of the list, since the
 228    * list is time sorted, newest first */
 229   ip_neighbor_elt_t *elt, *head;
 230
 231   ip_neighbor_touch (ipn);
 232   ipn->ipn_time_last_updated = vlib_time_now (vlib_get_main ());
 233   ipn->ipn_n_probes = 0;
 234
 235   if (ip_neighbor_is_dynamic (ipn))
 236     {
 237       if (~0 == ipn->ipn_elt)
 238         /* first time insertion */
 239         pool_get_zero (ip_neighbor_elt_pool, elt);
 240       else
 241         {
 242           /* already inserted - extract first */
 243           elt = pool_elt_at_index (ip_neighbor_elt_pool, ipn->ipn_elt);
 244
 245           clib_llist_remove (ip_neighbor_elt_pool, ipne_anchor, elt);
 246         }
 247       head = pool_elt_at_index (ip_neighbor_elt_pool,
 248                                 ip_neighbor_list_head[ip_neighbor_get_af
 249                                                       (ipn)]);
 250
 251       elt->ipne_index = ip_neighbor_get_index (ipn);
 252       clib_llist_add (ip_neighbor_elt_pool, ipne_anchor, elt, head);
 253       ipn->ipn_elt = elt - ip_neighbor_elt_pool;
 254     }
 255 }
 256
 257 static void
 258 ip_neighbor_db_add (const ip_neighbor_t * ipn)
 259 {
 260   ip_address_family_t af;
 261   u32 sw_if_index;
 262
 263   af = ip_neighbor_get_af (ipn);
 264   sw_if_index = ipn->ipn_key->ipnk_sw_if_index;
 265
 266   vec_validate (ip_neighbor_db[af].ipndb_hash, sw_if_index);
 267
 268   if (!ip_neighbor_db[af].ipndb_hash[sw_if_index])
 269     ip_neighbor_db[af].ipndb_hash[sw_if_index]
 270       = hash_create_mem (0, sizeof (ip_neighbor_key_t), sizeof (index_t));
 271
 272   hash_set_mem (ip_neighbor_db[af].ipndb_hash[sw_if_index],
 273                 ipn->ipn_key, ip_neighbor_get_index (ipn));
 274
 275   ip_neighbor_db[af].ipndb_n_elts++;
 276 }
 277
 278 static void
 279 ip_neighbor_db_remove (const ip_neighbor_t * ipn)
 280 {
 281   ip_address_family_t af;
 282   u32 sw_if_index;
 283
 284   af = ip_neighbor_get_af (ipn);
 285   sw_if_index = ipn->ipn_key->ipnk_sw_if_index;
 286
 287   vec_validate (ip_neighbor_db[af].ipndb_hash, sw_if_index);
 288
 289   hash_unset_mem (ip_neighbor_db[af].ipndb_hash[sw_if_index], ipn->ipn_key);
 290
 291   ip_neighbor_db[af].ipndb_n_elts--;
 292 }
 293
 294 static ip_neighbor_t *
 295 ip_neighbor_db_find (const ip_neighbor_key_t * key)
 296 {
 297   ip_address_family_t af;
 298   uword *p;
 299
 300   af = ip_addr_version (&key->ipnk_ip);
 301
 302   if (key->ipnk_sw_if_index >= vec_len (ip_neighbor_db[af].ipndb_hash))
 303     return NULL;
 304
 305   p = hash_get_mem (ip_neighbor_db[af].ipndb_hash
 306                     [key->ipnk_sw_if_index], key);
 307
 308   if (p)
 309     return ip_neighbor_get (p[0]);
 310
 311   return (NULL);
 312 }
 313
 314 static u8
 315 ip_af_type_pfx_len (ip_address_family_t type)
 316 {
 317   return (type == AF_IP4 ? 32 : 128);
 318 }
 319
 320 static void
 321 ip_neighbor_adj_fib_add (ip_neighbor_t * ipn, u32 fib_index)
 322 {
 323   ip_address_family_t af;
 324
 325   af = ip_neighbor_get_af (ipn);
 326
 327   if (af == AF_IP6 &&
 328       ip6_address_is_link_local_unicast (&ip_addr_v6
 329                                          (&ipn->ipn_key->ipnk_ip)))
 330     {
 331       ip6_ll_prefix_t pfx = {
 332         .ilp_addr = ip_addr_v6 (&ipn->ipn_key->ipnk_ip),
 333         .ilp_sw_if_index = ipn->ipn_key->ipnk_sw_if_index,
 334       };
 335       ipn->ipn_fib_entry_index =
 336         ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE);
 337     }
 338   else
 339     {
 340       fib_protocol_t fproto;
 341
 342       fproto = ip_address_family_to_fib_proto (af);
 343
 344       fib_prefix_t pfx = {
 345         .fp_len = ip_af_type_pfx_len (af),
 346         .fp_proto = fproto,
 347         .fp_addr = ip_addr_46 (&ipn->ipn_key->ipnk_ip),
 348       };
 349
 350       ipn->ipn_fib_entry_index =
 351         fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 352                                   FIB_ENTRY_FLAG_ATTACHED,
 353                                   fib_proto_to_dpo (fproto),
 354                                   &pfx.fp_addr,
 355                                   ipn->ipn_key->ipnk_sw_if_index,
 356                                   ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 357
 358       vec_validate (ip_neighbor_db[af].ipndb_n_elts_per_fib, fib_index);
 359
 360       ip_neighbor_db[af].ipndb_n_elts_per_fib[fib_index]++;
 361
 362       if (1 == ip_neighbor_db[af].ipndb_n_elts_per_fib[fib_index])
 363         fib_table_lock (fib_index, fproto, FIB_SOURCE_ADJ);
 364     }
 365 }
 366
 367 static void
 368 ip_neighbor_adj_fib_remove (ip_neighbor_t * ipn, u32 fib_index)
 369 {
 370   ip_address_family_t af;
 371
 372   af = ip_neighbor_get_af (ipn);
 373
 374   if (FIB_NODE_INDEX_INVALID != ipn->ipn_fib_entry_index)
 375     {
 376       if (AF_IP6 == af &&
 377           ip6_address_is_link_local_unicast (&ip_addr_v6
 378                                              (&ipn->ipn_key->ipnk_ip)))
 379         {
 380           ip6_ll_prefix_t pfx = {
 381             .ilp_addr = ip_addr_v6 (&ipn->ipn_key->ipnk_ip),
 382             .ilp_sw_if_index = ipn->ipn_key->ipnk_sw_if_index,
 383           };
 384           ip6_ll_table_entry_delete (&pfx);
 385         }
 386       else
 387         {
 388           fib_protocol_t fproto;
 389
 390           fproto = ip_address_family_to_fib_proto (af);
 391
 392           fib_prefix_t pfx = {
 393             .fp_len = ip_af_type_pfx_len (af),
 394             .fp_proto = fproto,
 395             .fp_addr = ip_addr_46 (&ipn->ipn_key->ipnk_ip),
 396           };
 397
 398           fib_table_entry_path_remove (fib_index,
 399                                        &pfx,
 400                                        FIB_SOURCE_ADJ,
 401                                        fib_proto_to_dpo (fproto),
 402                                        &pfx.fp_addr,
 403                                        ipn->ipn_key->ipnk_sw_if_index,
 404                                        ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
 405
 406           ip_neighbor_db[af].ipndb_n_elts_per_fib[fib_index]--;
 407
 408           if (0 == ip_neighbor_db[af].ipndb_n_elts_per_fib[fib_index])
 409             fib_table_unlock (fib_index, fproto, FIB_SOURCE_ADJ);
 410         }
 411     }
 412 }
 413
 414 static void
 415 ip_neighbor_mk_complete (adj_index_t ai, ip_neighbor_t * ipn)
 416 {
 417   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 418                           ethernet_build_rewrite (vnet_get_main (),
 419                                                   ipn->
 420                                                   ipn_key->ipnk_sw_if_index,
 421                                                   adj_get_link_type (ai),
 422                                                   ipn->ipn_mac.bytes));
 423 }
 424
 425 static void
 426 ip_neighbor_mk_incomplete (adj_index_t ai)
 427 {
 428   ip_adjacency_t *adj = adj_get (ai);
 429
 430   adj_nbr_update_rewrite (ai,
 431                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 432                           ethernet_build_rewrite (vnet_get_main (),
 433                                                   adj->
 434                                                   rewrite_header.sw_if_index,
 435                                                   VNET_LINK_ARP,
 436                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 437 }
 438
 439 static adj_walk_rc_t
 440 ip_neighbor_mk_complete_walk (adj_index_t ai, void *ctx)
 441 {
 442   ip_neighbor_t *ipn = ctx;
 443
 444   ip_neighbor_mk_complete (ai, ipn);
 445
 446   return (ADJ_WALK_RC_CONTINUE);
 447 }
 448
 449 static adj_walk_rc_t
 450 ip_neighbor_mk_incomplete_walk (adj_index_t ai, void *ctx)
 451 {
 452   ip_neighbor_mk_incomplete (ai);
 453
 454   return (ADJ_WALK_RC_CONTINUE);
 455 }
 456
 457 static void
 458 ip_neighbor_destroy (ip_neighbor_t * ipn)
 459 {
 460   ip_address_family_t af;
 461
 462   af = ip_neighbor_get_af (ipn);
 463
 464   IP_NEIGHBOR_DBG ("free: %U", format_ip_neighbor,
 465                    ip_neighbor_get_index (ipn));
 466
 467   ip_neighbor_publish (ip_neighbor_get_index (ipn),
 468                        IP_NEIGHBOR_EVENT_REMOVED);
 469
 470   adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
 471                    ip_address_family_to_fib_proto (af),
 472                    &ip_addr_46 (&ipn->ipn_key->ipnk_ip),
 473                    ip_neighbor_mk_incomplete_walk, ipn);
 474   ip_neighbor_adj_fib_remove
 475     (ipn,
 476      fib_table_get_index_for_sw_if_index
 477      (ip_address_family_to_fib_proto (af), ipn->ipn_key->ipnk_sw_if_index));
 478
 479   ip_neighbor_list_remove (ipn);
 480   ip_neighbor_db_remove (ipn);
 481   clib_mem_free (ipn->ipn_key);
 482
 483   pool_put (ip_neighbor_pool, ipn);
 484 }
 485
 486 static bool
 487 ip_neighbor_force_reuse (ip_address_family_t af)
 488 {
 489   if (!ip_neighbor_db[af].ipndb_recycle)
 490     return false;
 491
 492   /* pluck the oldest entry, which is the one from the end of the list */
 493   ip_neighbor_elt_t *elt, *head;
 494
 495   head = pool_elt_at_index (ip_neighbor_elt_pool, ip_neighbor_list_head[af]);
 496
 497   if (clib_llist_is_empty (ip_neighbor_elt_pool, ipne_anchor, head))
 498     return (false);
 499
 500   elt = clib_llist_prev (ip_neighbor_elt_pool, ipne_anchor, head);
 501   ip_neighbor_destroy (ip_neighbor_get (elt->ipne_index));
 502
 503   return (true);
 504 }
 505
 506 static ip_neighbor_t *
 507 ip_neighbor_alloc (const ip_neighbor_key_t * key,
 508                    const mac_address_t * mac, ip_neighbor_flags_t flags)
 509 {
 510   ip_address_family_t af;
 511   ip_neighbor_t *ipn;
 512
 513   af = ip_addr_version (&key->ipnk_ip);
 514
 515   if (ip_neighbor_db[af].ipndb_limit &&
 516       (ip_neighbor_db[af].ipndb_n_elts >= ip_neighbor_db[af].ipndb_limit))
 517     {
 518       if (!ip_neighbor_force_reuse (af))
 519         return (NULL);
 520     }
 521
 522   pool_get_zero (ip_neighbor_pool, ipn);
 523
 524   ipn->ipn_key = clib_mem_alloc (sizeof (*ipn->ipn_key));
 525   clib_memcpy (ipn->ipn_key, key, sizeof (*ipn->ipn_key));
 526
 527   ipn->ipn_fib_entry_index = FIB_NODE_INDEX_INVALID;
 528   ipn->ipn_flags = flags;
 529   ipn->ipn_elt = ~0;
 530
 531   mac_address_copy (&ipn->ipn_mac, mac);
 532
 533   ip_neighbor_db_add (ipn);
 534
 535   /* create the adj-fib. the entry in the FIB table for the peer's interface */
 536   if (!(ipn->ipn_flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY))
 537     ip_neighbor_adj_fib_add
 538       (ipn, fib_table_get_index_for_sw_if_index
 539        (ip_address_family_to_fib_proto (af), ipn->ipn_key->ipnk_sw_if_index));
 540
 541   return (ipn);
 542 }
 543
 544 int
 545 ip_neighbor_add (const ip_address_t * ip,
 546                  const mac_address_t * mac,
 547                  u32 sw_if_index,
 548                  ip_neighbor_flags_t flags, u32 * stats_index)
 549 {
 550   fib_protocol_t fproto;
 551   ip_neighbor_t *ipn;
 552
 553   /* main thread only */
 554   ASSERT (0 == vlib_get_thread_index ());
 555
 556   fproto = ip_address_family_to_fib_proto (ip_addr_version (ip));
 557
 558   const ip_neighbor_key_t key = {
 559     .ipnk_ip = *ip,
 560     .ipnk_sw_if_index = sw_if_index,
 561   };
 562
 563   ipn = ip_neighbor_db_find (&key);
 564
 565   if (ipn)
 566     {
 567       IP_NEIGHBOR_DBG ("update: %U, %U",
 568                        format_vnet_sw_if_index_name, vnet_get_main (),
 569                        sw_if_index, format_ip_address, ip,
 570                        format_ip_neighbor_flags, flags, format_mac_address_t,
 571                        mac);
 572
 573       ip_neighbor_touch (ipn);
 574
 575       /* Refuse to over-write static neighbor entry. */
 576       if (!(flags & IP_NEIGHBOR_FLAG_STATIC) &&
 577           (ipn->ipn_flags & IP_NEIGHBOR_FLAG_STATIC))
 578         {
 579           /* if MAC address match, still check to send event */
 580           if (0 == mac_address_cmp (&ipn->ipn_mac, mac))
 581             goto check_customers;
 582           return -2;
 583         }
 584
 585       /* A dynamic entry can become static, but not vice-versa.
 586        * i.e. since if it was programmed by the CP then it must
 587        * be removed by the CP */
 588       if ((flags & IP_NEIGHBOR_FLAG_STATIC) &&
 589           !(ipn->ipn_flags & IP_NEIGHBOR_FLAG_STATIC))
 590         {
 591           ip_neighbor_list_remove (ipn);
 592           ipn->ipn_flags |= IP_NEIGHBOR_FLAG_STATIC;
 593           ipn->ipn_flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
 594         }
 595
 596       /*
 597        * prevent a DoS attack from the data-plane that
 598        * spams us with no-op updates to the MAC address
 599        */
 600       if (0 == mac_address_cmp (&ipn->ipn_mac, mac))
 601         {
 602           ip_neighbor_refresh (ipn);
 603           goto check_customers;
 604         }
 605
 606       mac_address_copy (&ipn->ipn_mac, mac);
 607     }
 608   else
 609     {
 610       IP_NEIGHBOR_INFO ("add: %U, %U",
 611                         format_vnet_sw_if_index_name, vnet_get_main (),
 612                         sw_if_index, format_ip_address, ip,
 613                         format_ip_neighbor_flags, flags, format_mac_address_t,
 614                         mac);
 615
 616       ipn = ip_neighbor_alloc (&key, mac, flags);
 617
 618       if (NULL == ipn)
 619         return VNET_API_ERROR_LIMIT_EXCEEDED;
 620     }
 621
 622   /* Update time stamp and flags. */
 623   ip_neighbor_refresh (ipn);
 624
 625   adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
 626                    fproto, &ip_addr_46 (&ipn->ipn_key->ipnk_ip),
 627                    ip_neighbor_mk_complete_walk, ipn);
 628
 629 check_customers:
 630   /* Customer(s) requesting event for this address? */
 631   ip_neighbor_publish (ip_neighbor_get_index (ipn), IP_NEIGHBOR_EVENT_ADDED);
 632
 633   if (stats_index)
 634     *stats_index = adj_nbr_find (fproto,
 635                                  fib_proto_to_link (fproto),
 636                                  &ip_addr_46 (&ipn->ipn_key->ipnk_ip),
 637                                  ipn->ipn_key->ipnk_sw_if_index);
 638   return 0;
 639 }
 640
 641 int
 642 ip_neighbor_del (const ip_address_t * ip, u32 sw_if_index)
 643 {
 644   ip_neighbor_t *ipn;
 645
 646   /* main thread only */
 647   ASSERT (0 == vlib_get_thread_index ());
 648
 649   IP_NEIGHBOR_INFO ("delete: %U, %U",
 650                     format_vnet_sw_if_index_name, vnet_get_main (),
 651                     sw_if_index, format_ip_address, ip);
 652
 653   const ip_neighbor_key_t key = {
 654     .ipnk_ip = *ip,
 655     .ipnk_sw_if_index = sw_if_index,
 656   };
 657
 658   ipn = ip_neighbor_db_find (&key);
 659
 660   if (NULL == ipn)
 661     return (VNET_API_ERROR_NO_SUCH_ENTRY);
 662
 663   ip_neighbor_destroy (ipn);
 664
 665   return (0);
 666 }
 667
 668 typedef struct ip_neighbor_del_all_ctx_t_
 669 {
 670   index_t *ipn_del;
 671 } ip_neighbor_del_all_ctx_t;
 672
 673 static walk_rc_t
 674 ip_neighbor_del_all_walk_cb (index_t ipni, void *arg)
 675 {
 676   ip_neighbor_del_all_ctx_t *ctx = arg;
 677
 678   vec_add1 (ctx->ipn_del, ipni);
 679
 680   return (WALK_CONTINUE);
 681 }
 682
 683 void
 684 ip_neighbor_del_all (ip_address_family_t af, u32 sw_if_index)
 685 {
 686   IP_NEIGHBOR_INFO ("delete-all: %U, %U",
 687                     format_ip_address_family, af,
 688                     format_vnet_sw_if_index_name, vnet_get_main (),
 689                     sw_if_index);
 690
 691   ip_neighbor_del_all_ctx_t ctx = {
 692     .ipn_del = NULL,
 693   };
 694   index_t *ipni;
 695
 696   ip_neighbor_walk (af, sw_if_index, ip_neighbor_del_all_walk_cb, &ctx);
 697
 698   vec_foreach (ipni,
 699                ctx.ipn_del) ip_neighbor_destroy (ip_neighbor_get (*ipni));
 700   vec_free (ctx.ipn_del);
 701 }
 702
 703 void
 704 ip_neighbor_update (vnet_main_t * vnm, adj_index_t ai)
 705 {
 706   ip_neighbor_t *ipn;
 707   ip_adjacency_t *adj;
 708
 709   adj = adj_get (ai);
 710
 711   ip_neighbor_key_t key = {
 712     .ipnk_sw_if_index = adj->rewrite_header.sw_if_index,
 713   };
 714
 715   ip_address_from_46 (&adj->sub_type.nbr.next_hop,
 716                       adj->ia_nh_proto, &key.ipnk_ip);
 717
 718   ipn = ip_neighbor_db_find (&key);
 719
 720   switch (adj->lookup_next_index)
 721     {
 722     case IP_LOOKUP_NEXT_ARP:
 723       if (NULL != ipn)
 724         {
 725           adj_nbr_walk_nh (adj->rewrite_header.sw_if_index,
 726                            adj->ia_nh_proto,
 727                            &adj->sub_type.nbr.next_hop,
 728                            ip_neighbor_mk_complete_walk, ipn);
 729         }
 730       else
 731         {
 732           /*
 733            * no matching ARP entry.
 734            * construct the rewrite required to for an ARP packet, and stick
 735            * that in the adj's pipe to smoke.
 736            */
 737           adj_nbr_update_rewrite
 738             (ai,
 739              ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 740              ethernet_build_rewrite
 741              (vnm,
 742               adj->rewrite_header.sw_if_index,
 743               VNET_LINK_ARP,
 744               VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 745
 746           /*
 747            * since the FIB has added this adj for a route, it makes sense it
 748            * may want to forward traffic sometime soon. Let's send a
 749            * speculative ARP. just one. If we were to do periodically that
 750            * wouldn't be bad either, but that's more code than i'm prepared to
 751            * write at this time for relatively little reward.
 752            */
 753           /*
 754            * adj_nbr_update_rewrite may actually call fib_walk_sync.
 755            * fib_walk_sync may allocate a new adjacency and potentially cause
 756            * a realloc for adj_pool. When that happens, adj pointer is no
 757            * longer valid here.x We refresh adj pointer accordingly.
 758            */
 759           adj = adj_get (ai);
 760           ip_neighbor_probe (adj);
 761         }
 762       break;
 763     case IP_LOOKUP_NEXT_REWRITE:
 764       /* Update of an existing rewrite adjacency happens e.g. when the
 765        * interface's MAC address changes */
 766       if (NULL != ipn)
 767         ip_neighbor_mk_complete (ai, ipn);
 768       break;
 769     case IP_LOOKUP_NEXT_GLEAN:
 770     case IP_LOOKUP_NEXT_BCAST:
 771     case IP_LOOKUP_NEXT_MCAST:
 772     case IP_LOOKUP_NEXT_DROP:
 773     case IP_LOOKUP_NEXT_PUNT:
 774     case IP_LOOKUP_NEXT_LOCAL:
 775     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 776     case IP_LOOKUP_NEXT_MIDCHAIN:
 777     case IP_LOOKUP_NEXT_ICMP_ERROR:
 778     case IP_LOOKUP_N_NEXT:
 779       ASSERT (0);
 780       break;
 781     }
 782 }
 783
 784 void
 785 ip_neighbor_learn (const ip_neighbor_learn_t * l)
 786 {
 787   ip_neighbor_add (&l->ip, &l->mac, l->sw_if_index,
 788                    IP_NEIGHBOR_FLAG_DYNAMIC, NULL);
 789 }
 790
 791 static clib_error_t *
 792 ip_neighbor_cmd (vlib_main_t * vm,
 793                  unformat_input_t * input, vlib_cli_command_t * cmd)
 794 {
 795   ip_address_t ip = IP_ADDRESS_V6_ALL_0S;
 796   mac_address_t mac = ZERO_MAC_ADDRESS;
 797   vnet_main_t *vnm = vnet_get_main ();
 798   ip_neighbor_flags_t flags;
 799   u32 sw_if_index = ~0;
 800   int is_add = 1;
 801   int count = 1;
 802
 803   flags = IP_NEIGHBOR_FLAG_DYNAMIC;
 804
 805   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 806     {
 807       /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
 808       if (unformat (input, "%U %U %U",
 809                     unformat_vnet_sw_interface, vnm, &sw_if_index,
 810                     unformat_ip_address, &ip, unformat_mac_address_t, &mac))
 811         ;
 812       else if (unformat (input, "delete") || unformat (input, "del"))
 813         is_add = 0;
 814       else if (unformat (input, "static"))
 815         {
 816           flags |= IP_NEIGHBOR_FLAG_STATIC;
 817           flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
 818         }
 819       else if (unformat (input, "no-fib-entry"))
 820         flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 821       else if (unformat (input, "count %d", &count))
 822         ;
 823       else
 824         break;
 825     }
 826
 827   if (sw_if_index == ~0 ||
 828       ip_address_is_zero (&ip) || mac_address_is_zero (&mac))
 829     return clib_error_return (0,
 830                               "specify interface, IP address and MAC: `%U'",
 831                               format_unformat_error, input);
 832
 833   while (count)
 834     {
 835       if (is_add)
 836         ip_neighbor_add (&ip, &mac, sw_if_index, flags, NULL);
 837       else
 838         ip_neighbor_del (&ip, sw_if_index);
 839
 840       ip_address_increment (&ip);
 841       mac_address_increment (&mac);
 842
 843       --count;
 844     }
 845
 846   return NULL;
 847 }
 848
 849 /* *INDENT-OFF* */
 850 /*?
 851  * Add or delete IPv4 ARP cache entries.
 852  *
 853  * @note 'set ip neighbor' options (e.g. delete, static,
 854  * 'count <number>', 'interface ip4_addr mac_addr') can be added in
 855  * any order and combination.
 856  *
 857  * @cliexpar
 858  * @parblock
 859  * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
 860  * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
 861  * @cliexcmd{set ip neighbor GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
 862  * @cliexcmd{set ip neighbor delete GigabitEthernet2/0/0 6.0.0.3
 863  * de:ad:be:ef:ba:be}
 864  *
 865  * To add or delete an IPv4 ARP cache entry
 866  * table:
 867  * @cliexcmd{set ip neighbor GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
 868  * @cliexcmd{set ip neighbor delete GigabitEthernet2/0/0 6.0.0.3
 869  * dead.beef.babe}
 870  *
 871  * Add or delete IPv4 static ARP cache entries as follows:
 872  * @cliexcmd{set ip neighbor static GigabitEthernet2/0/0 6.0.0.3
 873  * dead.beef.babe}
 874  * @cliexcmd{set ip neighbor static delete GigabitEthernet2/0/0 6.0.0.3
 875  * dead.beef.babe}
 876  *
 877  * For testing / debugging purposes, the 'set ip neighbor' command can add or
 878  * delete multiple entries. Supply the 'count N' parameter:
 879  * @cliexcmd{set ip neighbor count 10 GigabitEthernet2/0/0 6.0.0.3
 880  * dead.beef.babe}
 881  * @endparblock
 882  ?*/
 883 VLIB_CLI_COMMAND (ip_neighbor_command, static) = {
 884   .path = "set ip neighbor",
 885   .short_help = "set ip neighbor [del] <intfc> <ip-address> <mac-address> "
 886                 "[static] [no-fib-entry] [count <count>]",
 887   .function = ip_neighbor_cmd,
 888 };
 889 VLIB_CLI_COMMAND (ip_neighbor_command2, static) = {
 890   .path = "ip neighbor",
 891   .short_help = "ip neighbor [del] <intfc> <ip-address> <mac-address> "
 892                 "[static] [no-fib-entry] [count <count>]",
 893   .function = ip_neighbor_cmd,
 894 };
 895 /* *INDENT-ON* */
 896
 897 static int
 898 ip_neighbor_sort (void *a1, void *a2)
 899 {
 900   index_t *ipni1 = a1, *ipni2 = a2;
 901   ip_neighbor_t *ipn1, *ipn2;
 902   int cmp;
 903
 904   ipn1 = ip_neighbor_get (*ipni1);
 905   ipn2 = ip_neighbor_get (*ipni2);
 906
 907   cmp = vnet_sw_interface_compare (vnet_get_main (),
 908                                    ipn1->ipn_key->ipnk_sw_if_index,
 909                                    ipn2->ipn_key->ipnk_sw_if_index);
 910   if (!cmp)
 911     cmp = ip_address_cmp (&ipn1->ipn_key->ipnk_ip, &ipn2->ipn_key->ipnk_ip);
 912   return cmp;
 913 }
 914
 915 static index_t *
 916 ip_neighbor_entries (u32 sw_if_index, ip_address_family_t af)
 917 {
 918   index_t *ipnis = NULL;
 919   ip_neighbor_t *ipn;
 920
 921   /* *INDENT-OFF* */
 922   pool_foreach (ipn, ip_neighbor_pool)
 923    {
 924     if ((sw_if_index == ~0 ||
 925         ipn->ipn_key->ipnk_sw_if_index == sw_if_index) &&
 926         (N_AF == af ||
 927          ip_neighbor_get_af(ipn) == af))
 928        vec_add1 (ipnis, ip_neighbor_get_index(ipn));
 929   }
 930
 931   /* *INDENT-ON* */
 932
 933   if (ipnis)
 934     vec_sort_with_function (ipnis, ip_neighbor_sort);
 935   return ipnis;
 936 }
 937
 938 static clib_error_t *
 939 ip_neighbor_show_sorted_i (vlib_main_t * vm,
 940                            unformat_input_t * input,
 941                            vlib_cli_command_t * cmd, ip_address_family_t af)
 942 {
 943   ip_neighbor_elt_t *elt, *head;
 944
 945   head = pool_elt_at_index (ip_neighbor_elt_pool, ip_neighbor_list_head[af]);
 946
 947
 948   vlib_cli_output (vm, "%=12s%=40s%=6s%=20s%=24s", "Time", "IP",
 949                    "Flags", "Ethernet", "Interface");
 950
 951   /* *INDENT-OFF*/
 952   /* the list is time sorted, newest first, so start from the back
 953    * and work forwards. Stop when we get to one that is alive */
 954   clib_llist_foreach_reverse(ip_neighbor_elt_pool,
 955                              ipne_anchor, head, elt,
 956   ({
 957     vlib_cli_output (vm, "%U", format_ip_neighbor, elt->ipne_index);
 958   }));
 959   /* *INDENT-ON*/
 960
 961   return (NULL);
 962 }
 963
 964 static clib_error_t *
 965 ip_neighbor_show_i (vlib_main_t * vm,
 966                     unformat_input_t * input,
 967                     vlib_cli_command_t * cmd, ip_address_family_t af)
 968 {
 969   index_t *ipni, *ipnis = NULL;
 970   u32 sw_if_index;
 971
 972   /* Filter entries by interface if given. */
 973   sw_if_index = ~0;
 974   (void) unformat_user (input, unformat_vnet_sw_interface, vnet_get_main (),
 975                         &sw_if_index);
 976
 977   ipnis = ip_neighbor_entries (sw_if_index, af);
 978
 979   if (ipnis)
 980     vlib_cli_output (vm, "%=12s%=40s%=6s%=20s%=24s", "Time", "IP",
 981                      "Flags", "Ethernet", "Interface");
 982
 983   vec_foreach (ipni, ipnis)
 984   {
 985     vlib_cli_output (vm, "%U", format_ip_neighbor, *ipni);
 986   }
 987   vec_free (ipnis);
 988
 989   return (NULL);
 990 }
 991
 992 static clib_error_t *
 993 ip_neighbor_show (vlib_main_t * vm,
 994                   unformat_input_t * input, vlib_cli_command_t * cmd)
 995 {
 996   return (ip_neighbor_show_i (vm, input, cmd, N_AF));
 997 }
 998
 999 static clib_error_t *
1000 ip6_neighbor_show (vlib_main_t * vm,
1001                    unformat_input_t * input, vlib_cli_command_t * cmd)
1002 {
1003   return (ip_neighbor_show_i (vm, input, cmd, AF_IP6));
1004 }
1005
1006 static clib_error_t *
1007 ip4_neighbor_show (vlib_main_t * vm,
1008                    unformat_input_t * input, vlib_cli_command_t * cmd)
1009 {
1010   return (ip_neighbor_show_i (vm, input, cmd, AF_IP4));
1011 }
1012
1013 static clib_error_t *
1014 ip6_neighbor_show_sorted (vlib_main_t * vm,
1015                           unformat_input_t * input, vlib_cli_command_t * cmd)
1016 {
1017   return (ip_neighbor_show_sorted_i (vm, input, cmd, AF_IP6));
1018 }
1019
1020 static clib_error_t *
1021 ip4_neighbor_show_sorted (vlib_main_t * vm,
1022                           unformat_input_t * input, vlib_cli_command_t * cmd)
1023 {
1024   return (ip_neighbor_show_sorted_i (vm, input, cmd, AF_IP4));
1025 }
1026
1027 /*?
1028  * Display all the IP neighbor entries.
1029  *
1030  * @cliexpar
1031  * Example of how to display the IPv4 ARP table:
1032  * @cliexstart{show ip neighbor}
1033  *    Time      FIB        IP4       Flags      Ethernet              Interface
1034  *    346.3028   0       6.1.1.3            de:ad:be:ef:ba:be   GigabitEthernet2/0/0
1035  *   3077.4271   0       6.1.1.4       S    de:ad:be:ef:ff:ff   GigabitEthernet2/0/0
1036  *   2998.6409   1       6.2.2.3            de:ad:be:ef:00:01   GigabitEthernet2/0/0
1037  * Proxy arps enabled for:
1038  * Fib_index 0   6.0.0.1 - 6.0.0.11
1039  * @cliexend
1040  ?*/
1041 /* *INDENT-OFF* */
1042 VLIB_CLI_COMMAND (show_ip_neighbors_cmd_node, static) = {
1043   .path = "show ip neighbors",
1044   .function = ip_neighbor_show,
1045   .short_help = "show ip neighbors [interface]",
1046 };
1047 VLIB_CLI_COMMAND (show_ip4_neighbors_cmd_node, static) = {
1048   .path = "show ip4 neighbors",
1049   .function = ip4_neighbor_show,
1050   .short_help = "show ip4 neighbors [interface]",
1051 };
1052 VLIB_CLI_COMMAND (show_ip6_neighbors_cmd_node, static) = {
1053   .path = "show ip6 neighbors",
1054   .function = ip6_neighbor_show,
1055   .short_help = "show ip6 neighbors [interface]",
1056 };
1057 VLIB_CLI_COMMAND (show_ip_neighbor_cmd_node, static) = {
1058   .path = "show ip neighbor",
1059   .function = ip_neighbor_show,
1060   .short_help = "show ip neighbor [interface]",
1061 };
1062 VLIB_CLI_COMMAND (show_ip4_neighbor_cmd_node, static) = {
1063   .path = "show ip4 neighbor",
1064   .function = ip4_neighbor_show,
1065   .short_help = "show ip4 neighbor [interface]",
1066 };
1067 VLIB_CLI_COMMAND (show_ip6_neighbor_cmd_node, static) = {
1068   .path = "show ip6 neighbor",
1069   .function = ip6_neighbor_show,
1070   .short_help = "show ip6 neighbor [interface]",
1071 };
1072 VLIB_CLI_COMMAND (show_ip4_neighbor_sorted_cmd_node, static) = {
1073   .path = "show ip4 neighbor-sorted",
1074   .function = ip4_neighbor_show_sorted,
1075   .short_help = "show ip4 neighbor-sorted",
1076 };
1077 VLIB_CLI_COMMAND (show_ip6_neighbor_sorted_cmd_node, static) = {
1078   .path = "show ip6 neighbor-sorted",
1079   .function = ip6_neighbor_show_sorted,
1080   .short_help = "show ip6 neighbor-sorted",
1081 };
1082 /* *INDENT-ON* */
1083
1084 static ip_neighbor_vft_t ip_nbr_vfts[N_AF];
1085
1086 void
1087 ip_neighbor_register (ip_address_family_t af, const ip_neighbor_vft_t * vft)
1088 {
1089   ip_nbr_vfts[af] = *vft;
1090 }
1091
1092 void
1093 ip_neighbor_probe_dst (u32 sw_if_index, u32 thread_index,
1094                        ip_address_family_t af, const ip46_address_t *dst)
1095 {
1096   if (!vnet_sw_interface_is_admin_up (vnet_get_main (), sw_if_index))
1097     return;
1098
1099   switch (af)
1100     {
1101     case AF_IP6:
1102       ip6_neighbor_probe_dst (sw_if_index, thread_index, &dst->ip6);
1103       break;
1104     case AF_IP4:
1105       ip4_neighbor_probe_dst (sw_if_index, thread_index, &dst->ip4);
1106       break;
1107     }
1108 }
1109
1110 void
1111 ip_neighbor_probe (const ip_adjacency_t * adj)
1112 {
1113   ip_neighbor_probe_dst (adj->rewrite_header.sw_if_index,
1114                          vlib_get_thread_index (),
1115                          ip_address_family_from_fib_proto (adj->ia_nh_proto),
1116                          &adj->sub_type.nbr.next_hop);
1117 }
1118
1119 void
1120 ip_neighbor_walk (ip_address_family_t af,
1121                   u32 sw_if_index, ip_neighbor_walk_cb_t cb, void *ctx)
1122 {
1123   ip_neighbor_key_t *key;
1124   index_t ipni;
1125
1126   if (~0 == sw_if_index)
1127     {
1128       uword **hash;
1129
1130       vec_foreach (hash, ip_neighbor_db[af].ipndb_hash)
1131       {
1132           /* *INDENT-OFF* */
1133           hash_foreach (key, ipni, *hash,
1134           ({
1135             if (WALK_STOP == cb (ipni, ctx))
1136               break;
1137           }));
1138           /* *INDENT-ON* */
1139       }
1140     }
1141   else
1142     {
1143       uword *hash;
1144
1145       if (vec_len (ip_neighbor_db[af].ipndb_hash) <= sw_if_index)
1146         return;
1147       hash = ip_neighbor_db[af].ipndb_hash[sw_if_index];
1148
1149       /* *INDENT-OFF* */
1150       hash_foreach (key, ipni, hash,
1151       ({
1152         if (WALK_STOP == cb (ipni, ctx))
1153           break;
1154       }));
1155       /* *INDENT-ON* */
1156     }
1157 }
1158
1159 int
1160 ip4_neighbor_proxy_add (u32 fib_index,
1161                         const ip4_address_t * start,
1162                         const ip4_address_t * end)
1163 {
1164   if (ip_nbr_vfts[AF_IP4].inv_proxy4_add)
1165     {
1166       return (ip_nbr_vfts[AF_IP4].inv_proxy4_add (fib_index, start, end));
1167     }
1168
1169   return (-1);
1170 }
1171
1172 int
1173 ip4_neighbor_proxy_delete (u32 fib_index,
1174                            const ip4_address_t * start,
1175                            const ip4_address_t * end)
1176 {
1177   if (ip_nbr_vfts[AF_IP4].inv_proxy4_del)
1178     {
1179       return (ip_nbr_vfts[AF_IP4].inv_proxy4_del (fib_index, start, end));
1180     }
1181   return -1;
1182 }
1183
1184 int
1185 ip4_neighbor_proxy_enable (u32 sw_if_index)
1186 {
1187   if (ip_nbr_vfts[AF_IP4].inv_proxy4_enable)
1188     {
1189       return (ip_nbr_vfts[AF_IP4].inv_proxy4_enable (sw_if_index));
1190     }
1191   return -1;
1192 }
1193
1194 int
1195 ip4_neighbor_proxy_disable (u32 sw_if_index)
1196 {
1197   if (ip_nbr_vfts[AF_IP4].inv_proxy4_disable)
1198     {
1199       return (ip_nbr_vfts[AF_IP4].inv_proxy4_disable (sw_if_index));
1200     }
1201   return -1;
1202 }
1203
1204 int
1205 ip6_neighbor_proxy_add (u32 sw_if_index, const ip6_address_t * addr)
1206 {
1207   if (ip_nbr_vfts[AF_IP6].inv_proxy6_add)
1208     {
1209       return (ip_nbr_vfts[AF_IP6].inv_proxy6_add (sw_if_index, addr));
1210     }
1211   return -1;
1212 }
1213
1214 int
1215 ip6_neighbor_proxy_del (u32 sw_if_index, const ip6_address_t * addr)
1216 {
1217   if (ip_nbr_vfts[AF_IP6].inv_proxy6_del)
1218     {
1219       return (ip_nbr_vfts[AF_IP6].inv_proxy6_del (sw_if_index, addr));
1220     }
1221   return -1;
1222 }
1223
1224 void
1225 ip_neighbor_populate (ip_address_family_t af, u32 sw_if_index)
1226 {
1227   index_t *ipnis = NULL, *ipni;
1228   ip_neighbor_t *ipn;
1229
1230   IP_NEIGHBOR_DBG ("populate: %U %U",
1231                    format_vnet_sw_if_index_name, vnet_get_main (),
1232                    sw_if_index, format_ip_address_family, af);
1233
1234   /* *INDENT-OFF* */
1235   pool_foreach (ipn, ip_neighbor_pool)
1236    {
1237     if (ip_neighbor_get_af(ipn) == af &&
1238         ipn->ipn_key->ipnk_sw_if_index == sw_if_index)
1239       vec_add1 (ipnis, ipn - ip_neighbor_pool);
1240   }
1241   /* *INDENT-ON* */
1242
1243   vec_foreach (ipni, ipnis)
1244   {
1245     ipn = ip_neighbor_get (*ipni);
1246
1247     adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
1248                      ip_address_family_to_fib_proto (ip_neighbor_get_af
1249                                                      (ipn)),
1250                      &ip_addr_46 (&ipn->ipn_key->ipnk_ip),
1251                      ip_neighbor_mk_complete_walk, ipn);
1252   }
1253   vec_free (ipnis);
1254 }
1255
1256 void
1257 ip_neighbor_flush (ip_address_family_t af, u32 sw_if_index)
1258 {
1259   index_t *ipnis = NULL, *ipni;
1260   ip_neighbor_t *ipn;
1261
1262
1263   IP_NEIGHBOR_DBG ("flush: %U %U",
1264                    format_vnet_sw_if_index_name, vnet_get_main (),
1265                    sw_if_index, format_ip_address_family, af);
1266
1267   /* *INDENT-OFF* */
1268   pool_foreach (ipn, ip_neighbor_pool)
1269    {
1270     if (ip_neighbor_get_af(ipn) == af &&
1271         ipn->ipn_key->ipnk_sw_if_index == sw_if_index &&
1272         ip_neighbor_is_dynamic (ipn))
1273       vec_add1 (ipnis, ipn - ip_neighbor_pool);
1274   }
1275   /* *INDENT-ON* */
1276
1277   vec_foreach (ipni, ipnis) ip_neighbor_destroy (ip_neighbor_get (*ipni));
1278   vec_free (ipnis);
1279 }
1280
1281 walk_rc_t
1282 ip_neighbor_mark_one (index_t ipni, void *ctx)
1283 {
1284   ip_neighbor_t *ipn;
1285
1286   ipn = ip_neighbor_get (ipni);
1287
1288   ipn->ipn_flags |= IP_NEIGHBOR_FLAG_STALE;
1289
1290   return (WALK_CONTINUE);
1291 }
1292
1293 void
1294 ip_neighbor_mark (ip_address_family_t af)
1295 {
1296   ip_neighbor_walk (af, ~0, ip_neighbor_mark_one, NULL);
1297 }
1298
1299 typedef struct ip_neighbor_sweep_ctx_t_
1300 {
1301   index_t *ipnsc_stale;
1302 } ip_neighbor_sweep_ctx_t;
1303
1304 static walk_rc_t
1305 ip_neighbor_sweep_one (index_t ipni, void *arg)
1306 {
1307   ip_neighbor_sweep_ctx_t *ctx = arg;
1308   ip_neighbor_t *ipn;
1309
1310   ipn = ip_neighbor_get (ipni);
1311
1312   if (ipn->ipn_flags & IP_NEIGHBOR_FLAG_STALE)
1313     {
1314       vec_add1 (ctx->ipnsc_stale, ipni);
1315     }
1316
1317   return (WALK_CONTINUE);
1318 }
1319
1320 void
1321 ip_neighbor_sweep (ip_address_family_t af)
1322 {
1323   ip_neighbor_sweep_ctx_t ctx = { };
1324   index_t *ipni;
1325
1326   ip_neighbor_walk (af, ~0, ip_neighbor_sweep_one, &ctx);
1327
1328   vec_foreach (ipni, ctx.ipnsc_stale)
1329   {
1330     ip_neighbor_destroy (ip_neighbor_get (*ipni));
1331   }
1332   vec_free (ctx.ipnsc_stale);
1333 }
1334
1335 /*
1336  * Remove any arp entries associated with the specified interface
1337  */
1338 static clib_error_t *
1339 ip_neighbor_interface_admin_change (vnet_main_t * vnm,
1340                                     u32 sw_if_index, u32 flags)
1341 {
1342   ip_address_family_t af;
1343
1344   IP_NEIGHBOR_DBG ("interface-admin: %U  %s",
1345                    format_vnet_sw_if_index_name, vnet_get_main (),
1346                    sw_if_index,
1347                    (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ? "up" : "down"));
1348
1349   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1350     {
1351       FOR_EACH_IP_ADDRESS_FAMILY (af) ip_neighbor_populate (af, sw_if_index);
1352     }
1353   else
1354     {
1355       /* admin down, flush all neighbours */
1356       FOR_EACH_IP_ADDRESS_FAMILY (af) ip_neighbor_flush (af, sw_if_index);
1357     }
1358
1359   return (NULL);
1360 }
1361
1362 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip_neighbor_interface_admin_change);
1363
1364 /*
1365  * Remove any arp entries associated with the specified interface
1366  */
1367 static clib_error_t *
1368 ip_neighbor_add_del_sw_interface (vnet_main_t *vnm, u32 sw_if_index,
1369                                   u32 is_add)
1370 {
1371   IP_NEIGHBOR_DBG ("interface-change: %U  %s",
1372                    format_vnet_sw_if_index_name, vnet_get_main (),
1373                    sw_if_index, (is_add ? "add" : "del"));
1374
1375   if (!is_add && sw_if_index != ~0)
1376     {
1377       ip_address_family_t af;
1378
1379       FOR_EACH_IP_ADDRESS_FAMILY (af) ip_neighbor_flush (af, sw_if_index);
1380     }
1381
1382   if (is_add)
1383     {
1384       ip_neighbor_alloc_ctr (&ip_neighbor_counters[AF_IP4], sw_if_index);
1385       ip_neighbor_alloc_ctr (&ip_neighbor_counters[AF_IP6], sw_if_index);
1386     }
1387
1388   return (NULL);
1389 }
1390
1391 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip_neighbor_add_del_sw_interface);
1392
1393 typedef struct ip_neighbor_walk_covered_ctx_t_
1394 {
1395   ip_address_t addr;
1396   u32 length;
1397   index_t *ipnis;
1398 } ip_neighbor_walk_covered_ctx_t;
1399
1400 static walk_rc_t
1401 ip_neighbor_walk_covered (index_t ipni, void *arg)
1402 {
1403   ip_neighbor_walk_covered_ctx_t *ctx = arg;
1404   ip_neighbor_t *ipn;
1405
1406   ipn = ip_neighbor_get (ipni);
1407
1408   if (AF_IP4 == ip_addr_version (&ctx->addr))
1409     {
1410       if (ip4_destination_matches_route (&ip4_main,
1411                                          &ip_addr_v4 (&ipn->ipn_key->ipnk_ip),
1412                                          &ip_addr_v4 (&ctx->addr),
1413                                          ctx->length) &&
1414           ip_neighbor_is_dynamic (ipn))
1415         {
1416           vec_add1 (ctx->ipnis, ip_neighbor_get_index (ipn));
1417         }
1418     }
1419   else if (AF_IP6 == ip_addr_version (&ctx->addr))
1420     {
1421       if (ip6_destination_matches_route (&ip6_main,
1422                                          &ip_addr_v6 (&ipn->ipn_key->ipnk_ip),
1423                                          &ip_addr_v6 (&ctx->addr),
1424                                          ctx->length) &&
1425           ip_neighbor_is_dynamic (ipn))
1426         {
1427           vec_add1 (ctx->ipnis, ip_neighbor_get_index (ipn));
1428         }
1429     }
1430   return (WALK_CONTINUE);
1431 }
1432
1433
1434 /*
1435  * callback when an interface address is added or deleted
1436  */
1437 static void
1438 ip_neighbor_add_del_interface_address_v4 (ip4_main_t * im,
1439                                           uword opaque,
1440                                           u32 sw_if_index,
1441                                           ip4_address_t * address,
1442                                           u32 address_length,
1443                                           u32 if_address_index, u32 is_del)
1444 {
1445   /*
1446    * Flush the ARP cache of all entries covered by the address
1447    * that is being removed.
1448    */
1449   IP_NEIGHBOR_DBG ("addr-%s: %U, %U/%d", (is_del ? "del" : "add"),
1450                    format_vnet_sw_if_index_name, vnet_get_main (), sw_if_index,
1451                    format_ip4_address, address, address_length);
1452
1453   if (is_del)
1454     {
1455       /* *INDENT-OFF* */
1456       ip_neighbor_walk_covered_ctx_t ctx = {
1457         .addr = {
1458           .ip.ip4 = *address,
1459           .version = AF_IP4,
1460         },
1461         .length = address_length,
1462       };
1463       /* *INDENT-ON* */
1464       index_t *ipni;
1465
1466       ip_neighbor_walk (AF_IP4, sw_if_index, ip_neighbor_walk_covered, &ctx);
1467
1468       vec_foreach (ipni, ctx.ipnis)
1469         ip_neighbor_destroy (ip_neighbor_get (*ipni));
1470
1471       vec_free (ctx.ipnis);
1472     }
1473 }
1474
1475 /*
1476  * callback when an interface address is added or deleted
1477  */
1478 static void
1479 ip_neighbor_add_del_interface_address_v6 (ip6_main_t * im,
1480                                           uword opaque,
1481                                           u32 sw_if_index,
1482                                           ip6_address_t * address,
1483                                           u32 address_length,
1484                                           u32 if_address_index, u32 is_del)
1485 {
1486   /*
1487    * Flush the ARP cache of all entries covered by the address
1488    * that is being removed.
1489    */
1490   IP_NEIGHBOR_DBG ("addr-change: %U, %U/%d %s",
1491                    format_vnet_sw_if_index_name, vnet_get_main (),
1492                    sw_if_index, format_ip6_address, address, address_length,
1493                    (is_del ? "del" : "add"));
1494
1495   if (is_del)
1496     {
1497       /* *INDENT-OFF* */
1498       ip_neighbor_walk_covered_ctx_t ctx = {
1499         .addr = {
1500           .ip.ip6 = *address,
1501           .version = AF_IP6,
1502         },
1503         .length = address_length,
1504       };
1505       /* *INDENT-ON* */
1506       index_t *ipni;
1507
1508       ip_neighbor_walk (AF_IP6, sw_if_index, ip_neighbor_walk_covered, &ctx);
1509
1510       vec_foreach (ipni, ctx.ipnis)
1511         ip_neighbor_destroy (ip_neighbor_get (*ipni));
1512
1513       vec_free (ctx.ipnis);
1514     }
1515 }
1516
1517 typedef struct ip_neighbor_table_bind_ctx_t_
1518 {
1519   u32 new_fib_index;
1520   u32 old_fib_index;
1521 } ip_neighbor_table_bind_ctx_t;
1522
1523 static walk_rc_t
1524 ip_neighbor_walk_table_bind (index_t ipni, void *arg)
1525 {
1526   ip_neighbor_table_bind_ctx_t *ctx = arg;
1527   ip_neighbor_t *ipn;
1528
1529   ipn = ip_neighbor_get (ipni);
1530   ip_neighbor_adj_fib_remove (ipn, ctx->old_fib_index);
1531   ip_neighbor_adj_fib_add (ipn, ctx->new_fib_index);
1532
1533   return (WALK_CONTINUE);
1534 }
1535
1536 static void
1537 ip_neighbor_table_bind_v4 (ip4_main_t * im,
1538                            uword opaque,
1539                            u32 sw_if_index,
1540                            u32 new_fib_index, u32 old_fib_index)
1541 {
1542   ip_neighbor_table_bind_ctx_t ctx = {
1543     .old_fib_index = old_fib_index,
1544     .new_fib_index = new_fib_index,
1545   };
1546
1547   ip_neighbor_walk (AF_IP4, sw_if_index, ip_neighbor_walk_table_bind, &ctx);
1548 }
1549
1550 static void
1551 ip_neighbor_table_bind_v6 (ip6_main_t * im,
1552                            uword opaque,
1553                            u32 sw_if_index,
1554                            u32 new_fib_index, u32 old_fib_index)
1555 {
1556   ip_neighbor_table_bind_ctx_t ctx = {
1557     .old_fib_index = old_fib_index,
1558     .new_fib_index = new_fib_index,
1559   };
1560
1561   ip_neighbor_walk (AF_IP6, sw_if_index, ip_neighbor_walk_table_bind, &ctx);
1562 }
1563
1564 typedef enum ip_neighbor_age_state_t_
1565 {
1566   IP_NEIGHBOR_AGE_ALIVE,
1567   IP_NEIGHBOR_AGE_PROBE,
1568   IP_NEIGHBOR_AGE_DEAD,
1569 } ip_neighbor_age_state_t;
1570
1571 #define IP_NEIGHBOR_PROCESS_SLEEP_LONG (0)
1572
1573 static ip_neighbor_age_state_t
1574 ip_neighbour_age_out (index_t ipni, f64 now, f64 * wait)
1575 {
1576   ip_address_family_t af;
1577   ip_neighbor_t *ipn;
1578   u32 ipndb_age;
1579   u32 ttl;
1580
1581   ipn = ip_neighbor_get (ipni);
1582   af = ip_neighbor_get_af (ipn);
1583   ipndb_age = ip_neighbor_db[af].ipndb_age;
1584   ttl = now - ipn->ipn_time_last_updated;
1585   *wait = ipndb_age;
1586
1587   if (ttl > ipndb_age)
1588     {
1589       IP_NEIGHBOR_DBG ("aged: %U @%f - %f > %d",
1590                        format_ip_neighbor, ipni, now,
1591                        ipn->ipn_time_last_updated, ipndb_age);
1592       if (ipn->ipn_n_probes > 2)
1593         {
1594           /* 3 strikes and yea-re out */
1595           IP_NEIGHBOR_DBG ("dead: %U", format_ip_neighbor, ipni);
1596           *wait = 1;
1597           return (IP_NEIGHBOR_AGE_DEAD);
1598         }
1599       else
1600         {
1601           ip_neighbor_probe_dst (ip_neighbor_get_sw_if_index (ipn),
1602                                  vlib_get_thread_index (), af,
1603                                  &ip_addr_46 (&ipn->ipn_key->ipnk_ip));
1604
1605           ipn->ipn_n_probes++;
1606           *wait = 1;
1607         }
1608     }
1609   else
1610     {
1611       /* here we are sure that ttl <= ipndb_age */
1612       *wait = ipndb_age - ttl + 1;
1613       return (IP_NEIGHBOR_AGE_ALIVE);
1614     }
1615
1616   return (IP_NEIGHBOR_AGE_PROBE);
1617 }
1618
1619 typedef enum ip_neighbor_process_event_t_
1620 {
1621   IP_NEIGHBOR_AGE_PROCESS_WAKEUP,
1622 } ip_neighbor_process_event_t;
1623
1624 static uword
1625 ip_neighbor_age_loop (vlib_main_t * vm,
1626                       vlib_node_runtime_t * rt,
1627                       vlib_frame_t * f, ip_address_family_t af)
1628 {
1629   uword event_type, *event_data = NULL;
1630   f64 timeout;
1631
1632   /* Set the timeout to an effectively infinite value when the process starts */
1633   timeout = IP_NEIGHBOR_PROCESS_SLEEP_LONG;
1634
1635   while (1)
1636     {
1637       f64 now;
1638
1639       if (!timeout)
1640         vlib_process_wait_for_event (vm);
1641       else
1642         vlib_process_wait_for_event_or_clock (vm, timeout);
1643
1644       event_type = vlib_process_get_events (vm, &event_data);
1645       vec_reset_length (event_data);
1646
1647       now = vlib_time_now (vm);
1648
1649       switch (event_type)
1650         {
1651         case ~0:
1652           {
1653             /* timer expired */
1654             ip_neighbor_elt_t *elt, *head;
1655             f64 wait;
1656
1657             timeout = ip_neighbor_db[af].ipndb_age;
1658             head = pool_elt_at_index (ip_neighbor_elt_pool,
1659                                       ip_neighbor_list_head[af]);
1660
1661           /* *INDENT-OFF*/
1662           /* the list is time sorted, newest first, so start from the back
1663            * and work forwards. Stop when we get to one that is alive */
1664           restart:
1665           clib_llist_foreach_reverse(ip_neighbor_elt_pool,
1666                                      ipne_anchor, head, elt,
1667           ({
1668             ip_neighbor_age_state_t res;
1669
1670             res = ip_neighbour_age_out(elt->ipne_index, now, &wait);
1671
1672             if (IP_NEIGHBOR_AGE_ALIVE == res) {
1673               /* the oldest neighbor has not yet expired, go back to sleep */
1674               timeout = clib_min (wait, timeout);
1675               break;
1676             }
1677             else if (IP_NEIGHBOR_AGE_DEAD == res) {
1678               /* the oldest neighbor is dead, pop it, then restart the walk
1679                * again from the back */
1680               ip_neighbor_destroy (ip_neighbor_get(elt->ipne_index));
1681               goto restart;
1682             }
1683
1684             timeout = clib_min (wait, timeout);
1685           }));
1686           /* *INDENT-ON* */
1687             break;
1688           }
1689         case IP_NEIGHBOR_AGE_PROCESS_WAKEUP:
1690           {
1691
1692             if (!ip_neighbor_db[af].ipndb_age)
1693               {
1694                 /* aging has been disabled */
1695                 timeout = 0;
1696                 break;
1697               }
1698             ip_neighbor_elt_t *elt, *head;
1699
1700             head = pool_elt_at_index (ip_neighbor_elt_pool,
1701                                       ip_neighbor_list_head[af]);
1702             /* no neighbors yet */
1703             if (clib_llist_is_empty (ip_neighbor_elt_pool, ipne_anchor, head))
1704               {
1705                 timeout = ip_neighbor_db[af].ipndb_age;
1706                 break;
1707               }
1708
1709             /* poke the oldset neighbour for aging, which returns how long we sleep for */
1710             elt = clib_llist_prev (ip_neighbor_elt_pool, ipne_anchor, head);
1711             ip_neighbour_age_out (elt->ipne_index, now, &timeout);
1712             break;
1713           }
1714         }
1715     }
1716   return 0;
1717 }
1718
1719 static uword
1720 ip4_neighbor_age_process (vlib_main_t * vm,
1721                           vlib_node_runtime_t * rt, vlib_frame_t * f)
1722 {
1723   return (ip_neighbor_age_loop (vm, rt, f, AF_IP4));
1724 }
1725
1726 static uword
1727 ip6_neighbor_age_process (vlib_main_t * vm,
1728                           vlib_node_runtime_t * rt, vlib_frame_t * f)
1729 {
1730   return (ip_neighbor_age_loop (vm, rt, f, AF_IP6));
1731 }
1732
1733 /* *INDENT-OFF* */
1734 VLIB_REGISTER_NODE (ip4_neighbor_age_process_node,static) = {
1735   .function = ip4_neighbor_age_process,
1736   .type = VLIB_NODE_TYPE_PROCESS,
1737   .name = "ip4-neighbor-age-process",
1738 };
1739 VLIB_REGISTER_NODE (ip6_neighbor_age_process_node,static) = {
1740   .function = ip6_neighbor_age_process,
1741   .type = VLIB_NODE_TYPE_PROCESS,
1742   .name = "ip6-neighbor-age-process",
1743 };
1744 /* *INDENT-ON* */
1745
1746 int
1747 ip_neighbor_config (ip_address_family_t af, u32 limit, u32 age, bool recycle)
1748 {
1749   ip_neighbor_db[af].ipndb_limit = limit;
1750   ip_neighbor_db[af].ipndb_recycle = recycle;
1751   ip_neighbor_db[af].ipndb_age = age;
1752
1753   vlib_process_signal_event (vlib_get_main (),
1754                              (AF_IP4 == af ?
1755                               ip4_neighbor_age_process_node.index :
1756                               ip6_neighbor_age_process_node.index),
1757                              IP_NEIGHBOR_AGE_PROCESS_WAKEUP, 0);
1758
1759   return (0);
1760 }
1761
1762 int
1763 ip_neighbor_get_config (ip_address_family_t af, u32 *limit, u32 *age,
1764                         bool *recycle)
1765 {
1766   *limit = ip_neighbor_db[af].ipndb_limit;
1767   *age = ip_neighbor_db[af].ipndb_age;
1768   *recycle = ip_neighbor_db[af].ipndb_recycle;
1769
1770   return (0);
1771 }
1772
1773 static clib_error_t *
1774 ip_neighbor_config_show (vlib_main_t * vm,
1775                          unformat_input_t * input, vlib_cli_command_t * cmd)
1776 {
1777   ip_address_family_t af;
1778
1779   /* *INDENT-OFF* */
1780   FOR_EACH_IP_ADDRESS_FAMILY(af) {
1781     vlib_cli_output (vm, "%U:", format_ip_address_family, af);
1782     vlib_cli_output (vm, "  limit:%d, age:%d, recycle:%d",
1783                      ip_neighbor_db[af].ipndb_limit,
1784                      ip_neighbor_db[af].ipndb_age,
1785                      ip_neighbor_db[af].ipndb_recycle);
1786   }
1787
1788   /* *INDENT-ON* */
1789   return (NULL);
1790 }
1791
1792 static clib_error_t *
1793 ip_neighbor_config_set (vlib_main_t *vm, unformat_input_t *input,
1794                         vlib_cli_command_t *cmd)
1795 {
1796   unformat_input_t _line_input, *line_input = &_line_input;
1797   clib_error_t *error = NULL;
1798   ip_address_family_t af;
1799   u32 limit, age;
1800   bool recycle;
1801
1802   if (!unformat_user (input, unformat_line_input, line_input))
1803     return 0;
1804
1805   if (!unformat (line_input, "%U", unformat_ip_address_family, &af))
1806     {
1807       error = unformat_parse_error (line_input);
1808       goto done;
1809     }
1810
1811   limit = ip_neighbor_db[af].ipndb_limit;
1812   age = ip_neighbor_db[af].ipndb_age;
1813   recycle = ip_neighbor_db[af].ipndb_recycle;
1814
1815   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1816     {
1817       if (unformat (line_input, "limit %u", &limit))
1818         ;
1819       else if (unformat (line_input, "age %u", &age))
1820         ;
1821       else if (unformat (line_input, "recycle"))
1822         recycle = true;
1823       else if (unformat (line_input, "norecycle"))
1824         recycle = false;
1825       else
1826         {
1827           error = unformat_parse_error (line_input);
1828           goto done;
1829         }
1830     }
1831
1832   ip_neighbor_config (af, limit, age, recycle);
1833
1834 done:
1835   unformat_free (line_input);
1836   return error;
1837 }
1838
1839 static void
1840 ip_neighbor_stats_show_one (vlib_main_t *vm, vnet_main_t *vnm, u32 sw_if_index)
1841 {
1842   vlib_cli_output (vm, "  %U", format_vnet_sw_if_index_name, vnm, sw_if_index);
1843   vlib_cli_output (vm, "    arp:%U", format_ip_neighbor_counters,
1844                    &ip_neighbor_counters[AF_IP4], sw_if_index);
1845   vlib_cli_output (vm, "    nd: %U", format_ip_neighbor_counters,
1846                    &ip_neighbor_counters[AF_IP6], sw_if_index);
1847 }
1848
1849 static walk_rc_t
1850 ip_neighbor_stats_show_cb (vnet_main_t *vnm, vnet_sw_interface_t *si,
1851                            void *ctx)
1852 {
1853   ip_neighbor_stats_show_one (ctx, vnm, si->sw_if_index);
1854
1855   return (WALK_CONTINUE);
1856 }
1857
1858 static clib_error_t *
1859 ip_neighbor_stats_show (vlib_main_t *vm, unformat_input_t *input,
1860                         vlib_cli_command_t *cmd)
1861 {
1862   vnet_main_t *vnm;
1863   u32 sw_if_index;
1864
1865   vnm = vnet_get_main ();
1866   sw_if_index = ~0;
1867   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1868
1869   if (~0 == sw_if_index)
1870     {
1871       vnet_sw_interface_walk (vnm, ip_neighbor_stats_show_cb, vm);
1872     }
1873   else
1874     {
1875       ip_neighbor_stats_show_one (vm, vnm, sw_if_index);
1876     }
1877   return (NULL);
1878 }
1879
1880 /* *INDENT-OFF* */
1881 VLIB_CLI_COMMAND (show_ip_neighbor_cfg_cmd_node, static) = {
1882   .path = "show ip neighbor-config",
1883   .function = ip_neighbor_config_show,
1884   .short_help = "show ip neighbor-config",
1885 };
1886 VLIB_CLI_COMMAND (set_ip_neighbor_cfg_cmd_node, static) = {
1887   .path = "set ip neighbor-config",
1888   .function = ip_neighbor_config_set,
1889   .short_help = "set ip neighbor-config ip4|ip6 [limit <limit>] [age <age>] "
1890                 "[recycle|norecycle]",
1891 };
1892 VLIB_CLI_COMMAND (show_ip_neighbor_stats_cmd_node, static) = {
1893   .path = "show ip neighbor-stats",
1894   .function = ip_neighbor_stats_show,
1895   .short_help = "show ip neighbor-stats [interface]",
1896 };
1897 /* *INDENT-ON* */
1898
1899 static clib_error_t *
1900 ip_neighbor_init (vlib_main_t * vm)
1901 {
1902   {
1903     ip4_add_del_interface_address_callback_t cb = {
1904       .function = ip_neighbor_add_del_interface_address_v4,
1905     };
1906     vec_add1 (ip4_main.add_del_interface_address_callbacks, cb);
1907   }
1908   {
1909     ip6_add_del_interface_address_callback_t cb = {
1910       .function = ip_neighbor_add_del_interface_address_v6,
1911     };
1912     vec_add1 (ip6_main.add_del_interface_address_callbacks, cb);
1913   }
1914   {
1915     ip4_table_bind_callback_t cb = {
1916       .function = ip_neighbor_table_bind_v4,
1917     };
1918     vec_add1 (ip4_main.table_bind_callbacks, cb);
1919   }
1920   {
1921     ip6_table_bind_callback_t cb = {
1922       .function = ip_neighbor_table_bind_v6,
1923     };
1924     vec_add1 (ip6_main.table_bind_callbacks, cb);
1925   }
1926   ipn_logger = vlib_log_register_class ("ip", "neighbor");
1927
1928   ip_address_family_t af;
1929
1930   FOR_EACH_IP_ADDRESS_FAMILY (af)
1931     ip_neighbor_list_head[af] =
1932     clib_llist_make_head (ip_neighbor_elt_pool, ipne_anchor);
1933
1934   return (NULL);
1935 }
1936
1937 /* *INDENT-OFF* */
1938 VLIB_INIT_FUNCTION (ip_neighbor_init) =
1939 {
1940   .runs_after = VLIB_INITS("ip_main_init"),
1941 };
1942 /* *INDENT-ON* */
1943
1944 /*
1945  * fd.io coding-style-patch-verification: ON
1946  *
1947  * Local Variables:
1948  * eval: (c-set-style "gnu")
1949  * End:
1950  */