src/vnet/ip/ip6_neighbor.c

   1 /*
   2  * ip/ip6_neighbor.c: IP6 neighbor handling
   3  *
   4  * Copyright (c) 2010 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 <vnet/ip/ip.h>
  19 #include <vnet/ip/ip6_neighbor.h>
  20 #include <vnet/ethernet/ethernet.h>
  21 #include <vppinfra/mhash.h>
  22 #include <vppinfra/md5.h>
  23 #include <vnet/adj/adj.h>
  24 #include <vnet/adj/adj_mcast.h>
  25 #include <vnet/fib/fib_table.h>
  26 #include <vnet/fib/ip6_fib.h>
  27 #include <vnet/mfib/ip6_mfib.h>
  28
  29 /**
  30  * @file
  31  * @brief IPv6 Neighbor Adjacency and Neighbor Discovery.
  32  *
  33  * The files contains the API and CLI code for managing IPv6 neighbor
  34  * adjacency tables and neighbor discovery logic.
  35  */
  36
  37 /* can't use sizeof link_layer_address, that's 8 */
  38 #define ETHER_MAC_ADDR_LEN 6
  39
  40 /* advertised prefix option */
  41 typedef struct
  42 {
  43   /* basic advertised information */
  44   ip6_address_t prefix;
  45   u8 prefix_len;
  46   int adv_on_link_flag;
  47   int adv_autonomous_flag;
  48   u32 adv_valid_lifetime_in_secs;
  49   u32 adv_pref_lifetime_in_secs;
  50
  51   /* advertised values are computed from these times if decrementing */
  52   f64 valid_lifetime_expires;
  53   f64 pref_lifetime_expires;
  54
  55   /* local information */
  56   int enabled;
  57   int deprecated_prefix_flag;
  58   int decrement_lifetime_flag;
  59
  60 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  61 #define DEF_ADV_VALID_LIFETIME  2592000
  62 #define DEF_ADV_PREF_LIFETIME 604800
  63
  64   /* extensions are added here, mobile, DNS etc.. */
  65 } ip6_radv_prefix_t;
  66
  67
  68 typedef struct
  69 {
  70   /* group information */
  71   u8 type;
  72   ip6_address_t mcast_address;
  73   u16 num_sources;
  74   ip6_address_t *mcast_source_address_pool;
  75 } ip6_mldp_group_t;
  76
  77 /* configured router advertisement information per ipv6 interface */
  78 typedef struct
  79 {
  80
  81   /* advertised config information, zero means unspecified  */
  82   u8 curr_hop_limit;
  83   int adv_managed_flag;
  84   int adv_other_flag;
  85   u16 adv_router_lifetime_in_sec;
  86   u32 adv_neighbor_reachable_time_in_msec;
  87   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
  88
  89   /* mtu option */
  90   u32 adv_link_mtu;
  91
  92   /* source link layer option */
  93   u8 link_layer_address[8];
  94   u8 link_layer_addr_len;
  95
  96   /* prefix option */
  97   ip6_radv_prefix_t *adv_prefixes_pool;
  98
  99   /* Hash table mapping address to index in interface advertised  prefix pool. */
 100   mhash_t address_to_prefix_index;
 101
 102   /* MLDP  group information */
 103   ip6_mldp_group_t *mldp_group_pool;
 104
 105   /* Hash table mapping address to index in mldp address pool. */
 106   mhash_t address_to_mldp_index;
 107
 108   /* local information */
 109   u32 sw_if_index;
 110   int send_radv;                /* radv on/off on this interface -  set by config */
 111   int cease_radv;               /* we are ceasing  to send  - set byf config */
 112   int send_unicast;
 113   int adv_link_layer_address;
 114   int prefix_option;
 115   int failed_device_check;
 116   int all_routers_mcast;
 117   u32 seed;
 118   u64 randomizer;
 119   int ref_count;
 120   adj_index_t mcast_adj_index;
 121
 122   /* timing information */
 123 #define DEF_MAX_RADV_INTERVAL 200
 124 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
 125 #define DEF_CURR_HOP_LIMIT  64
 126 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
 127 #define MAX_DEF_RTR_LIFETIME   9000
 128
 129 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
 130 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
 131 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
 132 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
 133 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
 134
 135   f64 max_radv_interval;
 136   f64 min_radv_interval;
 137   f64 min_delay_between_radv;
 138   f64 max_delay_between_radv;
 139   f64 max_rtr_default_lifetime;
 140
 141   f64 last_radv_time;
 142   f64 last_multicast_time;
 143   f64 next_multicast_time;
 144
 145
 146   u32 initial_adverts_count;
 147   f64 initial_adverts_interval;
 148   u32 initial_adverts_sent;
 149
 150   /* stats */
 151   u32 n_advertisements_sent;
 152   u32 n_solicitations_rcvd;
 153   u32 n_solicitations_dropped;
 154
 155   /* Link local address to use (defaults to underlying physical for logical interfaces */
 156   ip6_address_t link_local_address;
 157 } ip6_radv_t;
 158
 159 typedef struct
 160 {
 161   u32 next_index;
 162   uword node_index;
 163   uword type_opaque;
 164   uword data;
 165   /* Used for nd event notification only */
 166   void *data_callback;
 167   u32 pid;
 168 } pending_resolution_t;
 169
 170
 171 typedef struct
 172 {
 173   /* Hash tables mapping name to opcode. */
 174   uword *opcode_by_name;
 175
 176   /* lite beer "glean" adjacency handling */
 177   mhash_t pending_resolutions_by_address;
 178   pending_resolution_t *pending_resolutions;
 179
 180   /* Mac address change notification */
 181   mhash_t mac_changes_by_address;
 182   pending_resolution_t *mac_changes;
 183
 184   u32 *neighbor_input_next_index_by_hw_if_index;
 185
 186   ip6_neighbor_t *neighbor_pool;
 187
 188   mhash_t neighbor_index_by_key;
 189
 190   u32 *if_radv_pool_index_by_sw_if_index;
 191
 192   ip6_radv_t *if_radv_pool;
 193
 194   /* Neighbor attack mitigation */
 195   u32 limit_neighbor_cache_size;
 196   u32 neighbor_delete_rotor;
 197
 198 } ip6_neighbor_main_t;
 199
 200 /* ipv6 neighbor discovery - timer/event types */
 201 typedef enum
 202 {
 203   ICMP6_ND_EVENT_INIT,
 204 } ip6_icmp_neighbor_discovery_event_type_t;
 205
 206 typedef union
 207 {
 208   u32 add_del_swindex;
 209   struct
 210   {
 211     u32 up_down_swindex;
 212     u32 fib_index;
 213   } up_down_event;
 214 } ip6_icmp_neighbor_discovery_event_data_t;
 215
 216 static ip6_neighbor_main_t ip6_neighbor_main;
 217 static ip6_address_t ip6a_zero; /* ip6 address 0 */
 218
 219 static u8 *
 220 format_ip6_neighbor_ip6_entry (u8 * s, va_list * va)
 221 {
 222   vlib_main_t *vm = va_arg (*va, vlib_main_t *);
 223   ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *);
 224   vnet_main_t *vnm = vnet_get_main ();
 225   vnet_sw_interface_t *si;
 226   u8 *flags = 0;
 227
 228   if (!n)
 229     return format (s, "%=12s%=20s%=6s%=20s%=40s", "Time", "Address", "Flags",
 230                    "Link layer", "Interface");
 231
 232   if (n->flags & IP6_NEIGHBOR_FLAG_DYNAMIC)
 233     flags = format (flags, "D");
 234
 235   if (n->flags & IP6_NEIGHBOR_FLAG_STATIC)
 236     flags = format (flags, "S");
 237
 238   if (n->flags & IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY)
 239     flags = format (flags, "N");
 240
 241   si = vnet_get_sw_interface (vnm, n->key.sw_if_index);
 242   s = format (s, "%=12U%=20U%=6s%=20U%=40U",
 243               format_vlib_cpu_time, vm, n->cpu_time_last_updated,
 244               format_ip6_address, &n->key.ip6_address,
 245               flags ? (char *) flags : "",
 246               format_ethernet_address, n->link_layer_address,
 247               format_vnet_sw_interface_name, vnm, si);
 248
 249   vec_free (flags);
 250   return s;
 251 }
 252
 253 static clib_error_t *
 254 ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
 255                                    u32 sw_if_index, u32 flags)
 256 {
 257   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 258   ip6_neighbor_t *n;
 259
 260   if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 261     {
 262       u32 i, *to_delete = 0;
 263
 264       /* *INDENT-OFF* */
 265       pool_foreach (n, nm->neighbor_pool,
 266       ({
 267         if (n->key.sw_if_index == sw_if_index)
 268           vec_add1 (to_delete, n - nm->neighbor_pool);
 269       }));
 270       /* *INDENT-ON* */
 271
 272       for (i = 0; i < vec_len (to_delete); i++)
 273         {
 274           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 275           mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 276           if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 277             {
 278               fib_prefix_t pfx = {
 279                 .fp_len = 128,
 280                 .fp_proto = FIB_PROTOCOL_IP6,
 281                 .fp_addr.ip6 = n->key.ip6_address,
 282               };
 283               fib_table_entry_path_remove
 284                 (ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index),
 285                  &pfx,
 286                  FIB_SOURCE_ADJ,
 287                  DPO_PROTO_IP6,
 288                  &pfx.fp_addr,
 289                  n->key.sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
 290               pool_put (nm->neighbor_pool, n);
 291             }
 292         }
 293       vec_free (to_delete);
 294     }
 295
 296   return 0;
 297 }
 298
 299 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down);
 300
 301 static void
 302 unset_random_neighbor_entry (void)
 303 {
 304   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 305   vnet_main_t *vnm = vnet_get_main ();
 306   vlib_main_t *vm = vnm->vlib_main;
 307   ip6_neighbor_t *e;
 308   u32 index;
 309
 310   index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 311   nm->neighbor_delete_rotor = index;
 312
 313   /* Try again from elt 0, could happen if an intfc goes down */
 314   if (index == ~0)
 315     {
 316       index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 317       nm->neighbor_delete_rotor = index;
 318     }
 319
 320   /* Nothing left in the pool */
 321   if (index == ~0)
 322     return;
 323
 324   e = pool_elt_at_index (nm->neighbor_pool, index);
 325
 326   vnet_unset_ip6_ethernet_neighbor (vm, e->key.sw_if_index,
 327                                     &e->key.ip6_address,
 328                                     e->link_layer_address,
 329                                     ETHER_MAC_ADDR_LEN);
 330 }
 331
 332 typedef struct
 333 {
 334   u8 is_add;
 335   u8 is_static;
 336   u8 is_no_fib_entry;
 337   u8 link_layer_address[6];
 338   u32 sw_if_index;
 339   ip6_address_t addr;
 340 } ip6_neighbor_set_unset_rpc_args_t;
 341
 342 static void ip6_neighbor_set_unset_rpc_callback
 343   (ip6_neighbor_set_unset_rpc_args_t * a);
 344
 345 static void set_unset_ip6_neighbor_rpc
 346   (vlib_main_t * vm,
 347    u32 sw_if_index,
 348    ip6_address_t * a, u8 * link_layer_address, int is_add, int is_static,
 349    int is_no_fib_entry)
 350 {
 351   ip6_neighbor_set_unset_rpc_args_t args;
 352   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 353
 354   args.sw_if_index = sw_if_index;
 355   args.is_add = is_add;
 356   args.is_static = is_static;
 357   args.is_no_fib_entry = is_no_fib_entry;
 358   clib_memcpy (&args.addr, a, sizeof (*a));
 359   if (NULL != link_layer_address)
 360     clib_memcpy (args.link_layer_address, link_layer_address, 6);
 361
 362   vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback,
 363                                (u8 *) & args, sizeof (args));
 364 }
 365
 366 static void
 367 ip6_nbr_probe (ip_adjacency_t * adj)
 368 {
 369   icmp6_neighbor_solicitation_header_t *h;
 370   vnet_main_t *vnm = vnet_get_main ();
 371   ip6_main_t *im = &ip6_main;
 372   ip_interface_address_t *ia;
 373   ip6_address_t *dst, *src;
 374   vnet_hw_interface_t *hi;
 375   vnet_sw_interface_t *si;
 376   vlib_buffer_t *b;
 377   int bogus_length;
 378   vlib_main_t *vm;
 379   u32 bi = 0;
 380
 381   vm = vlib_get_main ();
 382
 383   si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
 384   dst = &adj->sub_type.nbr.next_hop.ip6;
 385
 386   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 387     {
 388       return;
 389     }
 390   src = ip6_interface_address_matching_destination (im, dst,
 391                                                     adj->rewrite_header.
 392                                                     sw_if_index, &ia);
 393   if (!src)
 394     {
 395       return;
 396     }
 397
 398   h = vlib_packet_template_get_packet (vm,
 399                                        &im->discover_neighbor_packet_template,
 400                                        &bi);
 401
 402   hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
 403
 404   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
 405   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
 406   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
 407   h->ip.src_address = src[0];
 408   h->neighbor.target_address = dst[0];
 409
 410   clib_memcpy (h->link_layer_option.ethernet_address,
 411                hi->hw_address, vec_len (hi->hw_address));
 412
 413   h->neighbor.icmp.checksum =
 414     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
 415   ASSERT (bogus_length == 0);
 416
 417   b = vlib_get_buffer (vm, bi);
 418   vnet_buffer (b)->sw_if_index[VLIB_RX] =
 419     vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
 420
 421   /* Add encapsulation string for software interface (e.g. ethernet header). */
 422   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
 423   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
 424
 425   {
 426     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
 427     u32 *to_next = vlib_frame_vector_args (f);
 428     to_next[0] = bi;
 429     f->n_vectors = 1;
 430     vlib_put_frame_to_node (vm, hi->output_node_index, f);
 431   }
 432 }
 433
 434 static void
 435 ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr)
 436 {
 437   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 438                           ethernet_build_rewrite (vnet_get_main (),
 439                                                   nbr->key.sw_if_index,
 440                                                   adj_get_link_type (ai),
 441                                                   nbr->link_layer_address));
 442 }
 443
 444 static void
 445 ip6_nd_mk_incomplete (adj_index_t ai)
 446 {
 447   ip_adjacency_t *adj = adj_get (ai);
 448
 449   adj_nbr_update_rewrite (ai,
 450                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 451                           ethernet_build_rewrite (vnet_get_main (),
 452                                                   adj->rewrite_header.
 453                                                   sw_if_index,
 454                                                   adj_get_link_type (ai),
 455                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 456 }
 457
 458 #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \
 459 {                                            \
 460     k.sw_if_index = sw_if_index;             \
 461     k.ip6_address = *addr;                   \
 462     k.pad = 0;                               \
 463 }
 464
 465 static ip6_neighbor_t *
 466 ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr)
 467 {
 468   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 469   ip6_neighbor_t *n = NULL;
 470   ip6_neighbor_key_t k;
 471   uword *p;
 472
 473   IP6_NBR_MK_KEY (k, sw_if_index, addr);
 474
 475   p = mhash_get (&nm->neighbor_index_by_key, &k);
 476   if (p)
 477     {
 478       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 479     }
 480
 481   return (n);
 482 }
 483
 484 static adj_walk_rc_t
 485 ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx)
 486 {
 487   ip6_neighbor_t *nbr = ctx;
 488
 489   ip6_nd_mk_complete (ai, nbr);
 490
 491   return (ADJ_WALK_RC_CONTINUE);
 492 }
 493
 494 static adj_walk_rc_t
 495 ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx)
 496 {
 497   ip6_nd_mk_incomplete (ai);
 498
 499   return (ADJ_WALK_RC_CONTINUE);
 500 }
 501
 502 void
 503 ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 504 {
 505   ip6_neighbor_t *nbr;
 506   ip_adjacency_t *adj;
 507
 508   adj = adj_get (ai);
 509
 510   nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6);
 511
 512   switch (adj->lookup_next_index)
 513     {
 514     case IP_LOOKUP_NEXT_ARP:
 515     case IP_LOOKUP_NEXT_GLEAN:
 516       if (NULL != nbr)
 517         {
 518           adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
 519                             ip6_nd_mk_complete_walk, nbr);
 520         }
 521       else
 522         {
 523           /*
 524            * no matching ND entry.
 525            * construct the rewrite required to for an ND packet, and stick
 526            * that in the adj's pipe to smoke.
 527            */
 528           adj_nbr_update_rewrite (ai,
 529                                   ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 530                                   ethernet_build_rewrite (vnm,
 531                                                           sw_if_index,
 532                                                           VNET_LINK_IP6,
 533                                                           VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 534
 535           /*
 536            * since the FIB has added this adj for a route, it makes sense it may
 537            * want to forward traffic sometime soon. Let's send a speculative ND.
 538            * just one. If we were to do periodically that wouldn't be bad either,
 539            * but that's more code than i'm prepared to write at this time for
 540            * relatively little reward.
 541            */
 542           ip6_nbr_probe (adj);
 543         }
 544       break;
 545     case IP_LOOKUP_NEXT_MCAST:
 546       {
 547         /*
 548          * Construct a partial rewrite from the known ethernet mcast dest MAC
 549          */
 550         u8 *rewrite;
 551         u8 offset;
 552
 553         rewrite = ethernet_build_rewrite (vnm,
 554                                           sw_if_index,
 555                                           adj->ia_link,
 556                                           ethernet_ip6_mcast_dst_addr ());
 557
 558         /*
 559          * Complete the remaining fields of the adj's rewrite to direct the
 560          * complete of the rewrite at switch time by copying in the IP
 561          * dst address's bytes.
 562          * Ofset is 2 bytes into the desintation address. And we write 4 bytes.
 563          */
 564         offset = vec_len (rewrite) - 2;
 565         adj_mcast_update_rewrite (ai, rewrite, offset, 0xffffffff);
 566
 567         break;
 568       }
 569     case IP_LOOKUP_NEXT_DROP:
 570     case IP_LOOKUP_NEXT_PUNT:
 571     case IP_LOOKUP_NEXT_LOCAL:
 572     case IP_LOOKUP_NEXT_REWRITE:
 573     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 574     case IP_LOOKUP_NEXT_MIDCHAIN:
 575     case IP_LOOKUP_NEXT_ICMP_ERROR:
 576     case IP_LOOKUP_N_NEXT:
 577       ASSERT (0);
 578       break;
 579     }
 580 }
 581
 582 int
 583 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 584                                 u32 sw_if_index,
 585                                 ip6_address_t * a,
 586                                 u8 * link_layer_address,
 587                                 uword n_bytes_link_layer_address,
 588                                 int is_static, int is_no_fib_entry)
 589 {
 590   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 591   ip6_neighbor_key_t k;
 592   ip6_neighbor_t *n = 0;
 593   int make_new_nd_cache_entry = 1;
 594   uword *p;
 595   u32 next_index;
 596   pending_resolution_t *pr, *mc;
 597
 598   if (vlib_get_thread_index ())
 599     {
 600       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, link_layer_address,
 601                                   1 /* set new neighbor */ , is_static,
 602                                   is_no_fib_entry);
 603       return 0;
 604     }
 605
 606   k.sw_if_index = sw_if_index;
 607   k.ip6_address = a[0];
 608   k.pad = 0;
 609
 610   p = mhash_get (&nm->neighbor_index_by_key, &k);
 611   if (p)
 612     {
 613       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 614       /* Refuse to over-write static neighbor entry. */
 615       if (!is_static && (n->flags & IP6_NEIGHBOR_FLAG_STATIC))
 616         return -2;
 617       make_new_nd_cache_entry = 0;
 618     }
 619
 620   if (make_new_nd_cache_entry)
 621     {
 622       pool_get (nm->neighbor_pool, n);
 623       mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
 624                  /* old value */ 0);
 625       n->key = k;
 626       n->fib_entry_index = FIB_NODE_INDEX_INVALID;
 627
 628       clib_memcpy (n->link_layer_address,
 629                    link_layer_address, n_bytes_link_layer_address);
 630
 631       /*
 632        * create the adj-fib. the entry in the FIB table for and to the peer.
 633        */
 634       if (!is_no_fib_entry)
 635         {
 636           fib_prefix_t pfx = {
 637             .fp_len = 128,
 638             .fp_proto = FIB_PROTOCOL_IP6,
 639             .fp_addr.ip6 = k.ip6_address,
 640           };
 641           u32 fib_index;
 642
 643           fib_index =
 644             ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index);
 645           n->fib_entry_index =
 646             fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 647                                       FIB_ENTRY_FLAG_ATTACHED,
 648                                       DPO_PROTO_IP6, &pfx.fp_addr,
 649                                       n->key.sw_if_index, ~0, 1, NULL,
 650                                       FIB_ROUTE_PATH_FLAG_NONE);
 651         }
 652       else
 653         {
 654           n->flags |= IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 655         }
 656     }
 657   else
 658     {
 659       /*
 660        * prevent a DoS attack from the data-plane that
 661        * spams us with no-op updates to the MAC address
 662        */
 663       if (0 == memcmp (n->link_layer_address,
 664                        link_layer_address, n_bytes_link_layer_address))
 665         return -1;
 666
 667       clib_memcpy (n->link_layer_address,
 668                    link_layer_address, n_bytes_link_layer_address);
 669     }
 670
 671   /* Update time stamp and flags. */
 672   n->cpu_time_last_updated = clib_cpu_time_now ();
 673   if (is_static)
 674     n->flags |= IP6_NEIGHBOR_FLAG_STATIC;
 675   else
 676     n->flags |= IP6_NEIGHBOR_FLAG_DYNAMIC;
 677
 678   adj_nbr_walk_nh6 (sw_if_index,
 679                     &n->key.ip6_address, ip6_nd_mk_complete_walk, n);
 680
 681   /* Customer(s) waiting for this address to be resolved? */
 682   p = mhash_get (&nm->pending_resolutions_by_address, a);
 683   if (p)
 684     {
 685       next_index = p[0];
 686
 687       while (next_index != (u32) ~ 0)
 688         {
 689           pr = pool_elt_at_index (nm->pending_resolutions, next_index);
 690           vlib_process_signal_event (vm, pr->node_index,
 691                                      pr->type_opaque, pr->data);
 692           next_index = pr->next_index;
 693           pool_put (nm->pending_resolutions, pr);
 694         }
 695
 696       mhash_unset (&nm->pending_resolutions_by_address, a, 0);
 697     }
 698
 699   /* Customer(s) requesting ND event for this address? */
 700   p = mhash_get (&nm->mac_changes_by_address, a);
 701   if (p)
 702     {
 703       next_index = p[0];
 704
 705       while (next_index != (u32) ~ 0)
 706         {
 707           int (*fp) (u32, u8 *, u32, ip6_address_t *);
 708           int rv = 1;
 709           mc = pool_elt_at_index (nm->mac_changes, next_index);
 710           fp = mc->data_callback;
 711
 712           /* Call the user's data callback, return 1 to suppress dup events */
 713           if (fp)
 714             rv =
 715               (*fp) (mc->data, link_layer_address, sw_if_index, &ip6a_zero);
 716           /*
 717            * Signal the resolver process, as long as the user
 718            * says they want to be notified
 719            */
 720           if (rv == 0)
 721             vlib_process_signal_event (vm, mc->node_index,
 722                                        mc->type_opaque, mc->data);
 723           next_index = mc->next_index;
 724         }
 725     }
 726
 727   return 0;
 728 }
 729
 730 int
 731 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 732                                   u32 sw_if_index,
 733                                   ip6_address_t * a,
 734                                   u8 * link_layer_address,
 735                                   uword n_bytes_link_layer_address)
 736 {
 737   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 738   ip6_neighbor_key_t k;
 739   ip6_neighbor_t *n;
 740   uword *p;
 741   int rv = 0;
 742
 743   if (vlib_get_thread_index ())
 744     {
 745       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, link_layer_address,
 746                                   0 /* unset */ , 0, 0);
 747       return 0;
 748     }
 749
 750   k.sw_if_index = sw_if_index;
 751   k.ip6_address = a[0];
 752   k.pad = 0;
 753
 754   p = mhash_get (&nm->neighbor_index_by_key, &k);
 755   if (p == 0)
 756     {
 757       rv = -1;
 758       goto out;
 759     }
 760
 761   n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 762   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 763
 764   adj_nbr_walk_nh6 (sw_if_index,
 765                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 766
 767
 768   if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 769     {
 770       fib_prefix_t pfx = {
 771         .fp_len = 128,
 772         .fp_proto = FIB_PROTOCOL_IP6,
 773         .fp_addr.ip6 = n->key.ip6_address,
 774       };
 775       fib_table_entry_path_remove
 776         (ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index),
 777          &pfx,
 778          FIB_SOURCE_ADJ,
 779          DPO_PROTO_IP6,
 780          &pfx.fp_addr, n->key.sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
 781     }
 782   pool_put (nm->neighbor_pool, n);
 783
 784 out:
 785   return rv;
 786 }
 787
 788 static void ip6_neighbor_set_unset_rpc_callback
 789   (ip6_neighbor_set_unset_rpc_args_t * a)
 790 {
 791   vlib_main_t *vm = vlib_get_main ();
 792   if (a->is_add)
 793     vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 794                                     a->link_layer_address, 6, a->is_static,
 795                                     a->is_no_fib_entry);
 796   else
 797     vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 798                                       a->link_layer_address, 6);
 799 }
 800
 801 static int
 802 ip6_neighbor_sort (void *a1, void *a2)
 803 {
 804   vnet_main_t *vnm = vnet_get_main ();
 805   ip6_neighbor_t *n1 = a1, *n2 = a2;
 806   int cmp;
 807   cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index,
 808                                    n2->key.sw_if_index);
 809   if (!cmp)
 810     cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address);
 811   return cmp;
 812 }
 813
 814 ip6_neighbor_t *
 815 ip6_neighbors_entries (u32 sw_if_index)
 816 {
 817   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 818   ip6_neighbor_t *n, *ns = 0;
 819
 820   /* *INDENT-OFF* */
 821   pool_foreach (n, nm->neighbor_pool,
 822   ({
 823     if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index)
 824       continue;
 825     vec_add1 (ns, n[0]);
 826   }));
 827   /* *INDENT-ON* */
 828
 829   if (ns)
 830     vec_sort_with_function (ns, ip6_neighbor_sort);
 831   return ns;
 832 }
 833
 834 static clib_error_t *
 835 show_ip6_neighbors (vlib_main_t * vm,
 836                     unformat_input_t * input, vlib_cli_command_t * cmd)
 837 {
 838   vnet_main_t *vnm = vnet_get_main ();
 839   ip6_neighbor_t *n, *ns;
 840   clib_error_t *error = 0;
 841   u32 sw_if_index;
 842
 843   /* Filter entries by interface if given. */
 844   sw_if_index = ~0;
 845   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
 846
 847   ns = ip6_neighbors_entries (sw_if_index);
 848   if (ns)
 849     {
 850       vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0);
 851       vec_foreach (n, ns)
 852       {
 853         vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n);
 854       }
 855       vec_free (ns);
 856     }
 857
 858   return error;
 859 }
 860
 861 /*?
 862  * This command is used to display the adjacent IPv6 hosts found via
 863  * neighbor discovery. Optionally, limit the output to the specified
 864  * interface.
 865  *
 866  * @cliexpar
 867  * Example of how to display the IPv6 neighbor adjacency table:
 868  * @cliexstart{show ip6 neighbors}
 869  *     Time           Address       Flags     Link layer                     Interface
 870  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
 871  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
 872  *     886.6654     ::1:1:c:0:9       S    02:fe:e4:45:27:5b                GigabitEthernet3/0/0
 873  * @cliexend
 874  * Example of how to display the IPv6 neighbor adjacency table for given interface:
 875  * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0}
 876  *     Time           Address       Flags     Link layer                     Interface
 877  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
 878  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
 879  * @cliexend
 880 ?*/
 881 /* *INDENT-OFF* */
 882 VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = {
 883   .path = "show ip6 neighbors",
 884   .function = show_ip6_neighbors,
 885   .short_help = "show ip6 neighbors [<interface>]",
 886 };
 887 /* *INDENT-ON* */
 888
 889 static clib_error_t *
 890 set_ip6_neighbor (vlib_main_t * vm,
 891                   unformat_input_t * input, vlib_cli_command_t * cmd)
 892 {
 893   vnet_main_t *vnm = vnet_get_main ();
 894   ip6_address_t addr;
 895   u8 mac_address[6];
 896   int addr_valid = 0;
 897   int is_del = 0;
 898   int is_static = 0;
 899   int is_no_fib_entry = 0;
 900   u32 sw_if_index;
 901
 902   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 903     {
 904       /* intfc, ip6-address, mac-address */
 905       if (unformat (input, "%U %U %U",
 906                     unformat_vnet_sw_interface, vnm, &sw_if_index,
 907                     unformat_ip6_address, &addr,
 908                     unformat_ethernet_address, mac_address))
 909         addr_valid = 1;
 910
 911       else if (unformat (input, "delete") || unformat (input, "del"))
 912         is_del = 1;
 913       else if (unformat (input, "static"))
 914         is_static = 1;
 915       else if (unformat (input, "no-fib-entry"))
 916         is_no_fib_entry = 1;
 917       else
 918         break;
 919     }
 920
 921   if (!addr_valid)
 922     return clib_error_return (0, "Missing interface, ip6 or hw address");
 923
 924   if (!is_del)
 925     vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr,
 926                                     mac_address, sizeof (mac_address),
 927                                     is_static, is_no_fib_entry);
 928   else
 929     vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr,
 930                                       mac_address, sizeof (mac_address));
 931   return 0;
 932 }
 933
 934 /*?
 935  * This command is used to manually add an entry to the IPv6 neighbor
 936  * adjacency table. Optionally, the entry can be added as static. It is
 937  * also used to remove an entry from the table. Use the '<em>show ip6
 938  * neighbors</em>' command to display all learned and manually entered entries.
 939  *
 940  * @cliexpar
 941  * Example of how to add a static entry to the IPv6 neighbor adjacency table:
 942  * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static}
 943  * Example of how to delete an entry from the IPv6 neighbor adjacency table:
 944  * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b}
 945 ?*/
 946 /* *INDENT-OFF* */
 947 VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) =
 948 {
 949   .path = "set ip6 neighbor",
 950   .function = set_ip6_neighbor,
 951   .short_help = "set ip6 neighbor [del] <interface> <ip6-address> <mac-address> [static]",
 952 };
 953 /* *INDENT-ON* */
 954
 955 typedef enum
 956 {
 957   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
 958   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
 959   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
 960 } icmp6_neighbor_solicitation_or_advertisement_next_t;
 961
 962 static_always_inline uword
 963 icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm,
 964                                               vlib_node_runtime_t * node,
 965                                               vlib_frame_t * frame,
 966                                               uword is_solicitation)
 967 {
 968   vnet_main_t *vnm = vnet_get_main ();
 969   ip6_main_t *im = &ip6_main;
 970   uword n_packets = frame->n_vectors;
 971   u32 *from, *to_next;
 972   u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent;
 973   icmp6_neighbor_discovery_option_type_t option_type;
 974   vlib_node_runtime_t *error_node =
 975     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
 976   int bogus_length;
 977
 978   from = vlib_frame_vector_args (frame);
 979   n_left_from = n_packets;
 980   next_index = node->cached_next_index;
 981
 982   if (node->flags & VLIB_NODE_FLAG_TRACE)
 983     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
 984                                    /* stride */ 1,
 985                                    sizeof (icmp6_input_trace_t));
 986
 987   option_type =
 988     (is_solicitation
 989      ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address
 990      : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address);
 991   n_advertisements_sent = 0;
 992
 993   while (n_left_from > 0)
 994     {
 995       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 996
 997       while (n_left_from > 0 && n_left_to_next > 0)
 998         {
 999           vlib_buffer_t *p0;
1000           ip6_header_t *ip0;
1001           icmp6_neighbor_solicitation_or_advertisement_header_t *h0;
1002           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1003           u32 bi0, options_len0, sw_if_index0, next0, error0;
1004           u32 ip6_sadd_link_local, ip6_sadd_unspecified;
1005           int is_rewrite0;
1006           u32 ni0;
1007
1008           bi0 = to_next[0] = from[0];
1009
1010           from += 1;
1011           to_next += 1;
1012           n_left_from -= 1;
1013           n_left_to_next -= 1;
1014
1015           p0 = vlib_get_buffer (vm, bi0);
1016           ip0 = vlib_buffer_get_current (p0);
1017           h0 = ip6_next_header (ip0);
1018           options_len0 =
1019             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1020
1021           error0 = ICMP6_ERROR_NONE;
1022           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1023           ip6_sadd_link_local =
1024             ip6_address_is_link_local_unicast (&ip0->src_address);
1025           ip6_sadd_unspecified =
1026             ip6_address_is_unspecified (&ip0->src_address);
1027
1028           /* Check that source address is unspecified, link-local or else on-link. */
1029           if (!ip6_sadd_unspecified && !ip6_sadd_link_local)
1030             {
1031               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1032
1033               if (ADJ_INDEX_INVALID != src_adj_index0)
1034                 {
1035                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1036
1037                   /* Allow all realistic-looking rewrite adjacencies to pass */
1038                   ni0 = adj0->lookup_next_index;
1039                   is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) &&
1040                     (ni0 < IP6_LOOKUP_N_NEXT);
1041
1042                   error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0
1043                              || !is_rewrite0)
1044                             ?
1045                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK
1046                             : error0);
1047                 }
1048               else
1049                 {
1050                   error0 =
1051                     ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK;
1052                 }
1053             }
1054
1055           o0 = (void *) (h0 + 1);
1056           o0 = ((options_len0 == 8 && o0->header.type == option_type
1057                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1058
1059           /* If src address unspecified or link local, donot learn neighbor MAC */
1060           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1061                             !ip6_sadd_unspecified))
1062             {
1063               ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1064               if (nm->limit_neighbor_cache_size &&
1065                   pool_elts (nm->neighbor_pool) >=
1066                   nm->limit_neighbor_cache_size)
1067                 unset_random_neighbor_entry ();
1068               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1069                                               is_solicitation ?
1070                                               &ip0->src_address :
1071                                               &h0->target_address,
1072                                               o0->ethernet_address,
1073                                               sizeof (o0->ethernet_address),
1074                                               0, ip6_sadd_link_local);
1075             }
1076
1077           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1078             {
1079               /* Check that target address is local to this router. */
1080               fib_node_index_t fei;
1081               u32 fib_index;
1082
1083               fib_index =
1084                 ip6_fib_table_get_index_for_sw_if_index (sw_if_index0);
1085
1086               if (~0 == fib_index)
1087                 {
1088                   error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1089                 }
1090               else
1091                 {
1092                   fei = ip6_fib_table_lookup_exact_match (fib_index,
1093                                                           &h0->target_address,
1094                                                           128);
1095
1096                   if (FIB_NODE_INDEX_INVALID == fei)
1097                     {
1098                       /* The target address is not in the FIB */
1099                       error0 =
1100                         ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1101                     }
1102                   else
1103                     {
1104                       if (FIB_ENTRY_FLAG_LOCAL &
1105                           fib_entry_get_flags_for_source (fei,
1106                                                           FIB_SOURCE_INTERFACE))
1107                         {
1108                           /* It's an address that belongs to one of our interfaces
1109                            * that's good. */
1110                         }
1111                       else
1112                         if (fib_entry_is_sourced
1113                             (fei, FIB_SOURCE_IP6_ND_PROXY))
1114                         {
1115                           /* The address was added by IPv6 Proxy ND config.
1116                            * We should only respond to these if the NS arrived on
1117                            * the link that has a matching covering prefix */
1118                         }
1119                       else
1120                         {
1121                           error0 =
1122                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1123                         }
1124                     }
1125                 }
1126             }
1127
1128           if (is_solicitation)
1129             next0 = (error0 != ICMP6_ERROR_NONE
1130                      ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP
1131                      : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY);
1132           else
1133             {
1134               next0 = 0;
1135               error0 = error0 == ICMP6_ERROR_NONE ?
1136                 ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0;
1137             }
1138
1139           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1140             {
1141               vnet_sw_interface_t *sw_if0;
1142               ethernet_interface_t *eth_if0;
1143               ethernet_header_t *eth0;
1144
1145               /* dst address is either source address or the all-nodes mcast addr */
1146               if (!ip6_sadd_unspecified)
1147                 ip0->dst_address = ip0->src_address;
1148               else
1149                 ip6_set_reserved_multicast_address (&ip0->dst_address,
1150                                                     IP6_MULTICAST_SCOPE_link_local,
1151                                                     IP6_MULTICAST_GROUP_ID_all_hosts);
1152
1153               ip0->src_address = h0->target_address;
1154               ip0->hop_limit = 255;
1155               h0->icmp.type = ICMP6_neighbor_advertisement;
1156
1157               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1158               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1159               eth_if0 =
1160                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1161               if (eth_if0 && o0)
1162                 {
1163                   clib_memcpy (o0->ethernet_address, eth_if0->address, 6);
1164                   o0->header.type =
1165                     ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
1166                 }
1167
1168               h0->advertisement_flags = clib_host_to_net_u32
1169                 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
1170                  | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
1171
1172               h0->icmp.checksum = 0;
1173               h0->icmp.checksum =
1174                 ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1175                                                    &bogus_length);
1176               ASSERT (bogus_length == 0);
1177
1178               /* Reuse current MAC header, copy SMAC to DMAC and
1179                * interface MAC to SMAC */
1180               vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0));
1181               eth0 = vlib_buffer_get_current (p0);
1182               clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1183               if (eth_if0)
1184                 clib_memcpy (eth0->src_address, eth_if0->address, 6);
1185
1186               /* Setup input and output sw_if_index for packet */
1187               ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0);
1188               vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1189               vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1190                 vnet_main.local_interface_sw_if_index;
1191
1192               n_advertisements_sent++;
1193             }
1194
1195           p0->error = error_node->errors[error0];
1196
1197           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1198                                            to_next, n_left_to_next,
1199                                            bi0, next0);
1200         }
1201
1202       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1203     }
1204
1205   /* Account for advertisements sent. */
1206   vlib_error_count (vm, error_node->node_index,
1207                     ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX,
1208                     n_advertisements_sent);
1209
1210   return frame->n_vectors;
1211 }
1212
1213 /* for "syslogging" - use elog for now */
1214 #define foreach_log_level            \
1215   _ (DEBUG, "DEBUG")                         \
1216   _ (INFO, "INFORMATION")            \
1217   _ (NOTICE, "NOTICE")               \
1218   _ (WARNING, "WARNING")             \
1219   _ (ERR, "ERROR")                                    \
1220   _ (CRIT, "CRITICAL")                        \
1221   _ (ALERT, "ALERT")                          \
1222   _ (EMERG,  "EMERGENCY")
1223
1224 typedef enum
1225 {
1226 #define _(f,s) LOG_##f,
1227   foreach_log_level
1228 #undef _
1229 } log_level_t;
1230
1231 static char *log_level_strings[] = {
1232 #define _(f,s) s,
1233   foreach_log_level
1234 #undef _
1235 };
1236
1237 static int logmask = 1 << LOG_DEBUG;
1238
1239 static void
1240 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
1241 {
1242   /* just use elog for now */
1243   u8 *what;
1244   va_list va;
1245
1246   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
1247     return;
1248
1249   va_start (va, fmt);
1250   if (fmt)
1251     {
1252       what = va_format (0, fmt, &va);
1253
1254       ELOG_TYPE_DECLARE (e) =
1255       {
1256       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
1257       struct
1258       {
1259         u32 s[2];
1260       } *ed;
1261       ed = ELOG_DATA (&vm->elog_main, e);
1262       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
1263       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
1264     }
1265   va_end (va);
1266   return;
1267 }
1268
1269 /* ipv6 neighbor discovery - router advertisements */
1270 typedef enum
1271 {
1272   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
1273   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
1274   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
1275   ICMP6_ROUTER_SOLICITATION_N_NEXT,
1276 } icmp6_router_solicitation_or_advertisement_next_t;
1277
1278 static_always_inline uword
1279 icmp6_router_solicitation (vlib_main_t * vm,
1280                            vlib_node_runtime_t * node, vlib_frame_t * frame)
1281 {
1282   vnet_main_t *vnm = vnet_get_main ();
1283   ip6_main_t *im = &ip6_main;
1284   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1285   uword n_packets = frame->n_vectors;
1286   u32 *from, *to_next;
1287   u32 n_left_from, n_left_to_next, next_index;
1288   u32 n_advertisements_sent = 0;
1289   int bogus_length;
1290
1291   icmp6_neighbor_discovery_option_type_t option_type;
1292
1293   vlib_node_runtime_t *error_node =
1294     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1295
1296   from = vlib_frame_vector_args (frame);
1297   n_left_from = n_packets;
1298   next_index = node->cached_next_index;
1299
1300   if (node->flags & VLIB_NODE_FLAG_TRACE)
1301     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1302                                    /* stride */ 1,
1303                                    sizeof (icmp6_input_trace_t));
1304
1305   /* source may append his LL address */
1306   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1307
1308   while (n_left_from > 0)
1309     {
1310       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1311
1312       while (n_left_from > 0 && n_left_to_next > 0)
1313         {
1314           vlib_buffer_t *p0;
1315           ip6_header_t *ip0;
1316           ip6_radv_t *radv_info = 0;
1317
1318           icmp6_neighbor_discovery_header_t *h0;
1319           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1320
1321           u32 bi0, options_len0, sw_if_index0, next0, error0;
1322           u32 is_solicitation = 1, is_dropped = 0;
1323           u32 is_unspecified, is_link_local;
1324
1325           bi0 = to_next[0] = from[0];
1326
1327           from += 1;
1328           to_next += 1;
1329           n_left_from -= 1;
1330           n_left_to_next -= 1;
1331
1332           p0 = vlib_get_buffer (vm, bi0);
1333           ip0 = vlib_buffer_get_current (p0);
1334           h0 = ip6_next_header (ip0);
1335           options_len0 =
1336             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1337           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
1338           is_link_local =
1339             ip6_address_is_link_local_unicast (&ip0->src_address);
1340
1341           error0 = ICMP6_ERROR_NONE;
1342           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1343
1344           /* check if solicitation  (not from nd_timer node) */
1345           if (ip6_address_is_unspecified (&ip0->dst_address))
1346             is_solicitation = 0;
1347
1348           /* Check that source address is unspecified, link-local or else on-link. */
1349           if (!is_unspecified && !is_link_local)
1350             {
1351               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1352
1353               if (ADJ_INDEX_INVALID != src_adj_index0)
1354                 {
1355                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1356
1357                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
1358                             ?
1359                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
1360                             : error0);
1361                 }
1362               else
1363                 {
1364                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
1365                 }
1366             }
1367
1368           /* check for source LL option and process */
1369           o0 = (void *) (h0 + 1);
1370           o0 = ((options_len0 == 8
1371                  && o0->header.type == option_type
1372                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1373
1374           /* if src address unspecified IGNORE any options */
1375           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1376                             !is_unspecified && !is_link_local))
1377             {
1378               ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1379               if (nm->limit_neighbor_cache_size &&
1380                   pool_elts (nm->neighbor_pool) >=
1381                   nm->limit_neighbor_cache_size)
1382                 unset_random_neighbor_entry ();
1383
1384               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1385                                               &ip0->src_address,
1386                                               o0->ethernet_address,
1387                                               sizeof (o0->ethernet_address),
1388                                               0, 0);
1389             }
1390
1391           /* default is to drop */
1392           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1393
1394           if (error0 == ICMP6_ERROR_NONE)
1395             {
1396               vnet_sw_interface_t *sw_if0;
1397               ethernet_interface_t *eth_if0;
1398               u32 adj_index0;
1399
1400               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1401               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1402               eth_if0 =
1403                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1404
1405               /* only support ethernet interface type for now */
1406               error0 =
1407                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1408                 : error0;
1409
1410               if (error0 == ICMP6_ERROR_NONE)
1411                 {
1412                   u32 ri;
1413
1414                   /* adjust the sizeof the buffer to just include the ipv6 header */
1415                   p0->current_length -=
1416                     (options_len0 +
1417                      sizeof (icmp6_neighbor_discovery_header_t));
1418
1419                   /* look up the radv_t information for this interface */
1420                   vec_validate_init_empty
1421                     (nm->if_radv_pool_index_by_sw_if_index, sw_if_index0, ~0);
1422
1423                   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1424
1425                   if (ri != ~0)
1426                     radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1427
1428                   error0 =
1429                     ((!radv_info) ?
1430                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1431                      error0);
1432
1433                   if (error0 == ICMP6_ERROR_NONE)
1434                     {
1435                       f64 now = vlib_time_now (vm);
1436
1437                       /* for solicited adverts - need to rate limit */
1438                       if (is_solicitation)
1439                         {
1440                           if (0 != radv_info->last_radv_time &&
1441                               (now - radv_info->last_radv_time) <
1442                               MIN_DELAY_BETWEEN_RAS)
1443                             is_dropped = 1;
1444                           else
1445                             radv_info->last_radv_time = now;
1446                         }
1447
1448                       /* send now  */
1449                       icmp6_router_advertisement_header_t rh;
1450
1451                       rh.icmp.type = ICMP6_router_advertisement;
1452                       rh.icmp.code = 0;
1453                       rh.icmp.checksum = 0;
1454
1455                       rh.current_hop_limit = radv_info->curr_hop_limit;
1456                       rh.router_lifetime_in_sec =
1457                         clib_host_to_net_u16
1458                         (radv_info->adv_router_lifetime_in_sec);
1459                       rh.
1460                         time_in_msec_between_retransmitted_neighbor_solicitations
1461                         =
1462                         clib_host_to_net_u32 (radv_info->
1463                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
1464                       rh.neighbor_reachable_time_in_msec =
1465                         clib_host_to_net_u32 (radv_info->
1466                                               adv_neighbor_reachable_time_in_msec);
1467
1468                       rh.flags =
1469                         (radv_info->adv_managed_flag) ?
1470                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
1471                         0;
1472                       rh.flags |=
1473                         ((radv_info->adv_other_flag) ?
1474                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
1475                          0);
1476
1477
1478                       u16 payload_length =
1479                         sizeof (icmp6_router_advertisement_header_t);
1480
1481                       vlib_buffer_add_data (vm,
1482                                             vlib_buffer_get_free_list_index
1483                                             (p0), bi0, (void *) &rh,
1484                                             sizeof
1485                                             (icmp6_router_advertisement_header_t));
1486
1487                       if (radv_info->adv_link_layer_address)
1488                         {
1489                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1490                             h;
1491
1492                           h.header.type =
1493                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1494                           h.header.n_data_u64s = 1;
1495
1496                           /* copy ll address */
1497                           clib_memcpy (&h.ethernet_address[0],
1498                                        eth_if0->address, 6);
1499
1500                           vlib_buffer_add_data (vm,
1501                                                 vlib_buffer_get_free_list_index
1502                                                 (p0), bi0, (void *) &h,
1503                                                 sizeof
1504                                                 (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t));
1505
1506                           payload_length +=
1507                             sizeof
1508                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1509                         }
1510
1511                       /* add MTU option */
1512                       if (radv_info->adv_link_mtu)
1513                         {
1514                           icmp6_neighbor_discovery_mtu_option_t h;
1515
1516                           h.unused = 0;
1517                           h.mtu =
1518                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1519                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1520                           h.header.n_data_u64s = 1;
1521
1522                           payload_length +=
1523                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1524
1525                           vlib_buffer_add_data (vm,
1526                                                 vlib_buffer_get_free_list_index
1527                                                 (p0), bi0, (void *) &h,
1528                                                 sizeof
1529                                                 (icmp6_neighbor_discovery_mtu_option_t));
1530                         }
1531
1532                       /* add advertised prefix options  */
1533                       ip6_radv_prefix_t *pr_info;
1534
1535                       /* *INDENT-OFF* */
1536                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1537                       ({
1538                         if(pr_info->enabled &&
1539                            (!pr_info->decrement_lifetime_flag
1540                             || (pr_info->pref_lifetime_expires >0)))
1541                           {
1542                             /* advertise this prefix */
1543                             icmp6_neighbor_discovery_prefix_information_option_t h;
1544
1545                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1546                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1547
1548                             h.dst_address_length  = pr_info->prefix_len;
1549
1550                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1551                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1552
1553                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1554                               {
1555                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1556                                 h.preferred_time  = 0;
1557                               }
1558                             else
1559                               {
1560                                 if(pr_info->decrement_lifetime_flag)
1561                                   {
1562                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1563                                       (pr_info->valid_lifetime_expires  - now) : 0;
1564
1565                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1566                                       (pr_info->pref_lifetime_expires  - now) : 0;
1567                                   }
1568
1569                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1570                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1571                               }
1572                             h.unused  = 0;
1573
1574                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1575
1576                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1577
1578                             vlib_buffer_add_data (vm,
1579                                             vlib_buffer_get_free_list_index (p0),
1580                                                   bi0,
1581                                                   (void *)&h, sizeof(icmp6_neighbor_discovery_prefix_information_option_t));
1582
1583                           }
1584                       }));
1585                       /* *INDENT-ON* */
1586
1587                       /* add additional options before here */
1588
1589                       /* finish building the router advertisement... */
1590                       if (!is_unspecified && radv_info->send_unicast)
1591                         {
1592                           ip0->dst_address = ip0->src_address;
1593                         }
1594                       else
1595                         {
1596                           /* target address is all-nodes mcast addr */
1597                           ip6_set_reserved_multicast_address
1598                             (&ip0->dst_address,
1599                              IP6_MULTICAST_SCOPE_link_local,
1600                              IP6_MULTICAST_GROUP_ID_all_hosts);
1601                         }
1602
1603                       /* source address MUST be the link-local address */
1604                       ip0->src_address = radv_info->link_local_address;
1605
1606                       ip0->hop_limit = 255;
1607                       ip0->payload_length =
1608                         clib_host_to_net_u16 (payload_length);
1609
1610                       icmp6_router_advertisement_header_t *rh0 =
1611                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1612                       rh0->icmp.checksum =
1613                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1614                                                            &bogus_length);
1615                       ASSERT (bogus_length == 0);
1616
1617                       /* setup output if and adjacency */
1618                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1619                         vnet_main.local_interface_sw_if_index;
1620
1621                       if (is_solicitation)
1622                         {
1623                           ethernet_header_t *eth0;
1624                           /* Reuse current MAC header, copy SMAC to DMAC and
1625                            * interface MAC to SMAC */
1626                           vlib_buffer_reset (p0);
1627                           eth0 = vlib_buffer_get_current (p0);
1628                           clib_memcpy (eth0->dst_address, eth0->src_address,
1629                                        6);
1630                           clib_memcpy (eth0->src_address, eth_if0->address,
1631                                        6);
1632                           next0 =
1633                             is_dropped ? next0 :
1634                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1635                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1636                             sw_if_index0;
1637                         }
1638                       else
1639                         {
1640                           adj_index0 = radv_info->mcast_adj_index;
1641                           if (adj_index0 == 0)
1642                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1643                           else
1644                             {
1645                               next0 =
1646                                 is_dropped ? next0 :
1647                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1648                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1649                                 adj_index0;
1650                             }
1651                         }
1652                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1653
1654                       radv_info->n_solicitations_dropped += is_dropped;
1655                       radv_info->n_solicitations_rcvd += is_solicitation;
1656
1657                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1658                         {
1659                           radv_info->n_advertisements_sent++;
1660                           n_advertisements_sent++;
1661                         }
1662                     }
1663                 }
1664             }
1665
1666           p0->error = error_node->errors[error0];
1667
1668           if (error0 != ICMP6_ERROR_NONE)
1669             vlib_error_count (vm, error_node->node_index, error0, 1);
1670
1671           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1672                                            to_next, n_left_to_next,
1673                                            bi0, next0);
1674
1675         }
1676
1677       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1678     }
1679
1680   /* Account for router advertisements sent. */
1681   vlib_error_count (vm, error_node->node_index,
1682                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1683                     n_advertisements_sent);
1684
1685   return frame->n_vectors;
1686 }
1687
1688  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1689 static_always_inline uword
1690 icmp6_router_advertisement (vlib_main_t * vm,
1691                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1692 {
1693   vnet_main_t *vnm = vnet_get_main ();
1694   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1695   uword n_packets = frame->n_vectors;
1696   u32 *from, *to_next;
1697   u32 n_left_from, n_left_to_next, next_index;
1698   u32 n_advertisements_rcvd = 0;
1699
1700   vlib_node_runtime_t *error_node =
1701     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1702
1703   from = vlib_frame_vector_args (frame);
1704   n_left_from = n_packets;
1705   next_index = node->cached_next_index;
1706
1707   if (node->flags & VLIB_NODE_FLAG_TRACE)
1708     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1709                                    /* stride */ 1,
1710                                    sizeof (icmp6_input_trace_t));
1711
1712   while (n_left_from > 0)
1713     {
1714       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1715
1716       while (n_left_from > 0 && n_left_to_next > 0)
1717         {
1718           vlib_buffer_t *p0;
1719           ip6_header_t *ip0;
1720           ip6_radv_t *radv_info = 0;
1721           icmp6_router_advertisement_header_t *h0;
1722           u32 bi0, options_len0, sw_if_index0, next0, error0;
1723
1724           bi0 = to_next[0] = from[0];
1725
1726           from += 1;
1727           to_next += 1;
1728           n_left_from -= 1;
1729           n_left_to_next -= 1;
1730
1731           p0 = vlib_get_buffer (vm, bi0);
1732           ip0 = vlib_buffer_get_current (p0);
1733           h0 = ip6_next_header (ip0);
1734           options_len0 =
1735             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1736
1737           error0 = ICMP6_ERROR_NONE;
1738           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1739
1740           /* Check that source address is link-local */
1741           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1742             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1743
1744           /* default is to drop */
1745           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1746
1747           n_advertisements_rcvd++;
1748
1749           if (error0 == ICMP6_ERROR_NONE)
1750             {
1751               vnet_sw_interface_t *sw_if0;
1752               ethernet_interface_t *eth_if0;
1753
1754               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1755               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1756               eth_if0 =
1757                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1758
1759               /* only support ethernet interface type for now */
1760               error0 =
1761                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1762                 : error0;
1763
1764               if (error0 == ICMP6_ERROR_NONE)
1765                 {
1766                   u32 ri;
1767
1768                   /* look up the radv_t information for this interface */
1769                   vec_validate_init_empty
1770                     (nm->if_radv_pool_index_by_sw_if_index, sw_if_index0, ~0);
1771
1772                   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1773
1774                   if (ri != ~0)
1775                     radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1776
1777                   error0 =
1778                     ((!radv_info) ?
1779                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1780                      error0);
1781
1782                   if (error0 == ICMP6_ERROR_NONE)
1783                     {
1784                       /* validate advertised information */
1785                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
1786                           && (h0->current_hop_limit !=
1787                               radv_info->curr_hop_limit))
1788                         {
1789                           ip6_neighbor_syslog (vm, LOG_WARNING,
1790                                                "our AdvCurHopLimit on %U doesn't agree with %U",
1791                                                format_vnet_sw_if_index_name,
1792                                                vnm, sw_if_index0,
1793                                                format_ip6_address,
1794                                                &ip0->src_address);
1795                         }
1796
1797                       if ((h0->flags &
1798                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
1799                           != radv_info->adv_managed_flag)
1800                         {
1801                           ip6_neighbor_syslog (vm, LOG_WARNING,
1802                                                "our AdvManagedFlag on %U doesn't agree with %U",
1803                                                format_vnet_sw_if_index_name,
1804                                                vnm, sw_if_index0,
1805                                                format_ip6_address,
1806                                                &ip0->src_address);
1807                         }
1808
1809                       if ((h0->flags &
1810                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
1811                           != radv_info->adv_other_flag)
1812                         {
1813                           ip6_neighbor_syslog (vm, LOG_WARNING,
1814                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
1815                                                format_vnet_sw_if_index_name,
1816                                                vnm, sw_if_index0,
1817                                                format_ip6_address,
1818                                                &ip0->src_address);
1819                         }
1820
1821                       if ((h0->
1822                            time_in_msec_between_retransmitted_neighbor_solicitations
1823                            && radv_info->
1824                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
1825                           && (h0->
1826                               time_in_msec_between_retransmitted_neighbor_solicitations
1827                               !=
1828                               clib_host_to_net_u32 (radv_info->
1829                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
1830                         {
1831                           ip6_neighbor_syslog (vm, LOG_WARNING,
1832                                                "our AdvRetransTimer on %U doesn't agree with %U",
1833                                                format_vnet_sw_if_index_name,
1834                                                vnm, sw_if_index0,
1835                                                format_ip6_address,
1836                                                &ip0->src_address);
1837                         }
1838
1839                       if ((h0->neighbor_reachable_time_in_msec &&
1840                            radv_info->adv_neighbor_reachable_time_in_msec) &&
1841                           (h0->neighbor_reachable_time_in_msec !=
1842                            clib_host_to_net_u32
1843                            (radv_info->adv_neighbor_reachable_time_in_msec)))
1844                         {
1845                           ip6_neighbor_syslog (vm, LOG_WARNING,
1846                                                "our AdvReachableTime on %U doesn't agree with %U",
1847                                                format_vnet_sw_if_index_name,
1848                                                vnm, sw_if_index0,
1849                                                format_ip6_address,
1850                                                &ip0->src_address);
1851                         }
1852
1853                       /* check for MTU or prefix options or .. */
1854                       u8 *opt_hdr = (u8 *) (h0 + 1);
1855                       while (options_len0 > 0)
1856                         {
1857                           icmp6_neighbor_discovery_option_header_t *o0 =
1858                             (icmp6_neighbor_discovery_option_header_t *)
1859                             opt_hdr;
1860                           int opt_len = o0->n_data_u64s << 3;
1861                           icmp6_neighbor_discovery_option_type_t option_type =
1862                             o0->type;
1863
1864                           if (options_len0 < 2)
1865                             {
1866                               ip6_neighbor_syslog (vm, LOG_ERR,
1867                                                    "malformed RA packet on %U from %U",
1868                                                    format_vnet_sw_if_index_name,
1869                                                    vnm, sw_if_index0,
1870                                                    format_ip6_address,
1871                                                    &ip0->src_address);
1872                               break;
1873                             }
1874
1875                           if (opt_len == 0)
1876                             {
1877                               ip6_neighbor_syslog (vm, LOG_ERR,
1878                                                    " zero length option in RA on %U from %U",
1879                                                    format_vnet_sw_if_index_name,
1880                                                    vnm, sw_if_index0,
1881                                                    format_ip6_address,
1882                                                    &ip0->src_address);
1883                               break;
1884                             }
1885                           else if (opt_len > options_len0)
1886                             {
1887                               ip6_neighbor_syslog (vm, LOG_ERR,
1888                                                    "option length in RA packet  greater than total length on %U from %U",
1889                                                    format_vnet_sw_if_index_name,
1890                                                    vnm, sw_if_index0,
1891                                                    format_ip6_address,
1892                                                    &ip0->src_address);
1893                               break;
1894                             }
1895
1896                           options_len0 -= opt_len;
1897                           opt_hdr += opt_len;
1898
1899                           switch (option_type)
1900                             {
1901                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
1902                               {
1903                                 icmp6_neighbor_discovery_mtu_option_t *h =
1904                                   (icmp6_neighbor_discovery_mtu_option_t
1905                                    *) (o0);
1906
1907                                 if (opt_len < sizeof (*h))
1908                                   break;
1909
1910                                 if ((h->mtu && radv_info->adv_link_mtu) &&
1911                                     (h->mtu !=
1912                                      clib_host_to_net_u32
1913                                      (radv_info->adv_link_mtu)))
1914                                   {
1915                                     ip6_neighbor_syslog (vm, LOG_WARNING,
1916                                                          "our AdvLinkMTU on %U doesn't agree with %U",
1917                                                          format_vnet_sw_if_index_name,
1918                                                          vnm, sw_if_index0,
1919                                                          format_ip6_address,
1920                                                          &ip0->src_address);
1921                                   }
1922                               }
1923                               break;
1924
1925                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
1926                               {
1927                                 icmp6_neighbor_discovery_prefix_information_option_t
1928                                   * h =
1929                                   (icmp6_neighbor_discovery_prefix_information_option_t
1930                                    *) (o0);
1931
1932                                 /* validate advertised prefix options  */
1933                                 ip6_radv_prefix_t *pr_info;
1934                                 u32 preferred, valid;
1935
1936                                 if (opt_len < sizeof (*h))
1937                                   break;
1938
1939                                 preferred =
1940                                   clib_net_to_host_u32 (h->preferred_time);
1941                                 valid = clib_net_to_host_u32 (h->valid_time);
1942
1943                                 /* look for matching prefix - if we our advertising it, it better be consistant */
1944                                 /* *INDENT-OFF* */
1945                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1946                                 ({
1947
1948                                   ip6_address_t mask;
1949                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
1950
1951                                   if(pr_info->enabled &&
1952                                      (pr_info->prefix_len == h->dst_address_length) &&
1953                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
1954                                     {
1955                                       /* found it */
1956                                       if(!pr_info->decrement_lifetime_flag &&
1957                                          valid != pr_info->adv_valid_lifetime_in_secs)
1958                                         {
1959                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1960                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
1961                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1962                                                               format_ip6_address, &h->dst_address);
1963                                         }
1964                                       if(!pr_info->decrement_lifetime_flag &&
1965                                          preferred != pr_info->adv_pref_lifetime_in_secs)
1966                                         {
1967                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1968                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
1969                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1970                                                               format_ip6_address, &h->dst_address);
1971                                         }
1972                                     }
1973                                   break;
1974                                 }));
1975                                 /* *INDENT-ON* */
1976                                 break;
1977                               }
1978                             default:
1979                               /* skip this one */
1980                               break;
1981                             }
1982                         }
1983                     }
1984                 }
1985             }
1986
1987           p0->error = error_node->errors[error0];
1988
1989           if (error0 != ICMP6_ERROR_NONE)
1990             vlib_error_count (vm, error_node->node_index, error0, 1);
1991
1992           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1993                                            to_next, n_left_to_next,
1994                                            bi0, next0);
1995         }
1996
1997       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1998     }
1999
2000   /* Account for router advertisements sent. */
2001   vlib_error_count (vm, error_node->node_index,
2002                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2003                     n_advertisements_rcvd);
2004
2005   return frame->n_vectors;
2006 }
2007
2008 /**
2009  * @brief Add a multicast Address to the advertised MLD set
2010  */
2011 static void
2012 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2013 {
2014   ip6_mldp_group_t *mcast_group_info;
2015   uword *p;
2016
2017   /* lookup  mldp info for this interface */
2018   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2019   mcast_group_info =
2020     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2021
2022   /* add address */
2023   if (!mcast_group_info)
2024     {
2025       /* add */
2026       u32 mi;
2027       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2028
2029       mi = mcast_group_info - radv_info->mldp_group_pool;
2030       mhash_set (&radv_info->address_to_mldp_index, &addr, mi,  /* old_value */
2031                  0);
2032
2033       mcast_group_info->type = 4;
2034       mcast_group_info->mcast_source_address_pool = 0;
2035       mcast_group_info->num_sources = 0;
2036       clib_memcpy (&mcast_group_info->mcast_address, &addr,
2037                    sizeof (ip6_address_t));
2038     }
2039 }
2040
2041 /**
2042  * @brief Delete a multicast Address from the advertised MLD set
2043  */
2044 static void
2045 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2046 {
2047   ip6_mldp_group_t *mcast_group_info;
2048   uword *p;
2049
2050   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2051   mcast_group_info =
2052     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2053
2054   if (mcast_group_info)
2055     {
2056       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2057                    /* old_value */ 0);
2058       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2059     }
2060 }
2061
2062 /**
2063  * @brief Add a multicast Address to the advertised MLD set
2064  */
2065 static void
2066 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2067                           ip6_multicast_address_scope_t scope,
2068                           ip6_multicast_link_local_group_id_t group)
2069 {
2070   ip6_address_t addr;
2071
2072   ip6_set_reserved_multicast_address (&addr, scope, group);
2073
2074   ip6_neighbor_add_mld_prefix (a, &addr);
2075 }
2076
2077 /**
2078  * @brief create and initialize router advertisement parameters with default
2079  * values for this intfc
2080  */
2081 u32
2082 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2083                                    u32 sw_if_index, u32 is_add)
2084 {
2085   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2086   ip6_radv_t *a = 0;
2087   u32 ri = ~0;
2088   vnet_sw_interface_t *sw_if0;
2089   ethernet_interface_t *eth_if0 = 0;
2090
2091   /* lookup radv container  - ethernet interfaces only */
2092   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2093   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2094     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2095
2096   if (!eth_if0)
2097     return ri;
2098
2099   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2100                            ~0);
2101   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2102
2103   if (ri != ~0)
2104     {
2105       a = pool_elt_at_index (nm->if_radv_pool, ri);
2106
2107       if (!is_add)
2108         {
2109           ip6_radv_prefix_t *p;
2110           ip6_mldp_group_t *m;
2111
2112           /* release the lock on the interface's mcast adj */
2113           adj_unlock (a->mcast_adj_index);
2114
2115           /* clean up prefix and MDP pools */
2116           /* *INDENT-OFF* */
2117           pool_flush(p, a->adv_prefixes_pool,
2118           ({
2119               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2120           }));
2121           pool_flush (m, a->mldp_group_pool,
2122           ({
2123               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2124           }));
2125           /* *INDENT-ON* */
2126
2127           pool_free (a->mldp_group_pool);
2128           pool_free (a->adv_prefixes_pool);
2129
2130           mhash_free (&a->address_to_prefix_index);
2131           mhash_free (&a->address_to_mldp_index);
2132
2133           pool_put (nm->if_radv_pool, a);
2134           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2135           ri = ~0;
2136         }
2137     }
2138   else
2139     {
2140       if (is_add)
2141         {
2142           vnet_hw_interface_t *hw_if0;
2143
2144           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index);
2145
2146           pool_get (nm->if_radv_pool, a);
2147
2148           ri = a - nm->if_radv_pool;
2149           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2150
2151           /* initialize default values (most of which are zero) */
2152           memset (a, 0, sizeof (a[0]));
2153
2154           a->sw_if_index = sw_if_index;
2155           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2156           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2157           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2158           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2159
2160           /* send ll address source address option */
2161           a->adv_link_layer_address = 1;
2162
2163           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2164           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2165           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2166           a->seed = (u32) clib_cpu_time_now ();
2167           (void) random_u32 (&a->seed);
2168           a->randomizer = clib_cpu_time_now ();
2169           (void) random_u64 (&a->randomizer);
2170
2171           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2172           a->initial_adverts_sent = a->initial_adverts_count - 1;
2173           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2174
2175           /* deafult is to send */
2176           a->send_radv = 1;
2177
2178           /* fill in radv_info for this interface that will be needed later */
2179           a->adv_link_mtu = hw_if0->max_l3_packet_bytes[VLIB_RX];
2180
2181           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2182
2183           /* fill in default link-local address  (this may be overridden) */
2184           ip6_link_local_address_from_ethernet_address
2185             (&a->link_local_address, eth_if0->address);
2186
2187           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2188                       sizeof (ip6_address_t));
2189           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2190                       sizeof (ip6_address_t));
2191
2192           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2193                                                       VNET_LINK_IP6,
2194                                                       sw_if_index);
2195
2196           /* add multicast groups we will always be reporting  */
2197           ip6_neighbor_add_mld_grp (a,
2198                                     IP6_MULTICAST_SCOPE_link_local,
2199                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2200           ip6_neighbor_add_mld_grp (a,
2201                                     IP6_MULTICAST_SCOPE_link_local,
2202                                     IP6_MULTICAST_GROUP_ID_all_routers);
2203           ip6_neighbor_add_mld_grp (a,
2204                                     IP6_MULTICAST_SCOPE_link_local,
2205                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2206         }
2207     }
2208   return ri;
2209 }
2210
2211 /* send an mldpv2 report  */
2212 static void
2213 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2214 {
2215   vnet_main_t *vnm = vnet_get_main ();
2216   vlib_main_t *vm = vnm->vlib_main;
2217   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2218   vnet_sw_interface_t *sw_if0;
2219   ethernet_interface_t *eth_if0;
2220   u32 ri;
2221   int bogus_length;
2222
2223   ip6_radv_t *radv_info;
2224   u16 payload_length;
2225   vlib_buffer_t *b0;
2226   ip6_header_t *ip0;
2227   u32 *to_next;
2228   vlib_frame_t *f;
2229   u32 bo0;
2230   u32 n_to_alloc = 1;
2231   u32 n_allocated;
2232
2233   icmp6_multicast_listener_report_header_t *rh0;
2234   icmp6_multicast_listener_report_packet_t *rp0;
2235
2236   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2237   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2238   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2239
2240   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2241     return;
2242
2243   /* look up the radv_t  information for this interface */
2244   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2245                            ~0);
2246
2247   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2248
2249   if (ri == ~0)
2250     return;
2251
2252   /* send report now - build a mldpv2 report packet  */
2253   n_allocated = vlib_buffer_alloc_from_free_list (vm,
2254                                                   &bo0,
2255                                                   n_to_alloc,
2256                                                   VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2257   if (PREDICT_FALSE (n_allocated == 0))
2258     {
2259       clib_warning ("buffer allocation failure");
2260       return;
2261     }
2262
2263   b0 = vlib_get_buffer (vm, bo0);
2264
2265   /* adjust the sizeof the buffer to just include the ipv6 header */
2266   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2267
2268   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2269
2270   b0->error = ICMP6_ERROR_NONE;
2271
2272   rp0 = vlib_buffer_get_current (b0);
2273   ip0 = (ip6_header_t *) & rp0->ip;
2274   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2275
2276   memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2277
2278   ip0->ip_version_traffic_class_and_flow_label =
2279     clib_host_to_net_u32 (0x6 << 28);
2280
2281   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2282   /* for DEBUG - vnet driver won't seem to emit router alerts */
2283   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2284   ip0->hop_limit = 1;
2285
2286   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2287
2288   /* source address MUST be the link-local address */
2289   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2290   ip0->src_address = radv_info->link_local_address;
2291
2292   /* destination is all mldpv2 routers */
2293   ip6_set_reserved_multicast_address (&ip0->dst_address,
2294                                       IP6_MULTICAST_SCOPE_link_local,
2295                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2296
2297   /* add reports here */
2298   ip6_mldp_group_t *m;
2299   int num_addr_records = 0;
2300   icmp6_multicast_address_record_t rr;
2301
2302   /* fill in the hop-by-hop extension header (router alert) info */
2303   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2304   rh0->ext_hdr.n_data_u64s = 0;
2305
2306   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2307   rh0->alert.len = 2;
2308   rh0->alert.value = 0;
2309
2310   rh0->pad.type = 1;
2311   rh0->pad.len = 0;
2312
2313   rh0->icmp.checksum = 0;
2314
2315   /* *INDENT-OFF* */
2316   pool_foreach (m, radv_info->mldp_group_pool,
2317   ({
2318     rr.type = m->type;
2319     rr.aux_data_len_u32s = 0;
2320     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2321     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2322
2323     num_addr_records++;
2324
2325     vlib_buffer_add_data
2326       (vm, vlib_buffer_get_free_list_index (b0), bo0,
2327        (void *)&rr, sizeof(icmp6_multicast_address_record_t));
2328
2329     payload_length += sizeof( icmp6_multicast_address_record_t);
2330   }));
2331   /* *INDENT-ON* */
2332
2333   rh0->rsvd = 0;
2334   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2335
2336   /* update lengths */
2337   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2338
2339   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2340                                                           &bogus_length);
2341   ASSERT (bogus_length == 0);
2342
2343   /*
2344    * OK to override w/ no regard for actual FIB, because
2345    * ip6-rewrite only looks at the adjacency.
2346    */
2347   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2348     vnet_main.local_interface_sw_if_index;
2349
2350   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2351   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2352
2353   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2354
2355   f = vlib_get_frame_to_node (vm, node->index);
2356   to_next = vlib_frame_vector_args (f);
2357   to_next[0] = bo0;
2358   f->n_vectors = 1;
2359
2360   vlib_put_frame_to_node (vm, node->index, f);
2361   return;
2362 }
2363
2364 /* *INDENT-OFF* */
2365 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2366 {
2367   .function = icmp6_router_solicitation,
2368   .name = "icmp6-router-solicitation",
2369
2370   .vector_size = sizeof (u32),
2371
2372   .format_trace = format_icmp6_input_trace,
2373
2374   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2375   .next_nodes = {
2376     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "error-drop",
2377     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2378     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2379   },
2380 };
2381 /* *INDENT-ON* */
2382
2383 /* send a RA or update the timer info etc.. */
2384 static uword
2385 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2386                                   vlib_node_runtime_t * node,
2387                                   vlib_frame_t * frame)
2388 {
2389   vnet_main_t *vnm = vnet_get_main ();
2390   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2391   ip6_radv_t *radv_info;
2392   vlib_frame_t *f = 0;
2393   u32 n_this_frame = 0;
2394   u32 n_left_to_next = 0;
2395   u32 *to_next = 0;
2396   u32 bo0;
2397   icmp6_router_solicitation_header_t *h0;
2398   vlib_buffer_t *b0;
2399   f64 now = vlib_time_now (vm);
2400
2401   /* Interface ip6 radv info list */
2402   /* *INDENT-OFF* */
2403   pool_foreach (radv_info, nm->if_radv_pool,
2404   ({
2405     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2406       {
2407         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2408         radv_info->next_multicast_time = now;
2409         radv_info->last_multicast_time = now;
2410         radv_info->last_radv_time = 0;
2411         radv_info->all_routers_mcast = 0;
2412         continue;
2413       }
2414
2415     /* Make sure that we've joined the all-routers multicast group */
2416     if(!radv_info->all_routers_mcast)
2417       {
2418         /* send MDLP_REPORT_EVENT message */
2419         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2420         radv_info->all_routers_mcast = 1;
2421       }
2422
2423     /* is it time to send a multicast  RA on this interface? */
2424     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2425       {
2426         u32 n_to_alloc = 1;
2427         u32 n_allocated;
2428
2429         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2430           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2431
2432         /* multicast send - compute next multicast send time */
2433         if( radv_info->initial_adverts_sent > 0)
2434           {
2435             radv_info->initial_adverts_sent--;
2436             if(rfn > radv_info-> initial_adverts_interval)
2437               rfn =  radv_info-> initial_adverts_interval;
2438
2439             /* check to see if we are ceasing to send */
2440             if( radv_info->initial_adverts_sent  == 0)
2441               if(radv_info->cease_radv)
2442                 radv_info->send_radv = 0;
2443           }
2444
2445         radv_info->next_multicast_time =  rfn + now;
2446         radv_info->last_multicast_time = now;
2447
2448         /* send advert now - build a "solicted" router advert with unspecified source address */
2449         n_allocated = vlib_buffer_alloc_from_free_list
2450           (vm, &bo0, n_to_alloc, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2451
2452         if (PREDICT_FALSE(n_allocated == 0))
2453           {
2454             clib_warning ("buffer allocation failure");
2455             continue;
2456           }
2457         b0 = vlib_get_buffer (vm, bo0);
2458         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2459         b0->error = ICMP6_ERROR_NONE;
2460         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2461
2462         h0 =  vlib_buffer_get_current (b0);
2463
2464         memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2465
2466         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2467         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2468                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2469         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2470         h0->ip.hop_limit = 255;
2471
2472         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
2473         h0->ip.src_address.as_u64[0] = 0;
2474         h0->ip.src_address.as_u64[1] = 0;
2475
2476         h0->ip.dst_address.as_u64[0] = 0;
2477         h0->ip.dst_address.as_u64[1] = 0;
2478
2479         h0->neighbor.icmp.type = ICMP6_router_solicitation;
2480
2481         if (PREDICT_FALSE(f == 0))
2482           {
2483             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
2484             to_next = vlib_frame_vector_args (f);
2485             n_left_to_next = VLIB_FRAME_SIZE;
2486             n_this_frame = 0;
2487           }
2488
2489         n_this_frame++;
2490         n_left_to_next--;
2491         to_next[0] = bo0;
2492         to_next += 1;
2493
2494         if (PREDICT_FALSE(n_left_to_next == 0))
2495           {
2496             f->n_vectors = n_this_frame;
2497             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
2498             f = 0;
2499           }
2500       }
2501   }));
2502   /* *INDENT-ON* */
2503
2504   if (f)
2505     {
2506       ASSERT (n_this_frame);
2507       f->n_vectors = n_this_frame;
2508       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
2509     }
2510   return 0;
2511 }
2512
2513 static uword
2514 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
2515                                            vlib_node_runtime_t * node,
2516                                            vlib_frame_t * frame)
2517 {
2518   uword event_type;
2519   ip6_icmp_neighbor_discovery_event_data_t *event_data;
2520
2521   /* init code here */
2522
2523   while (1)
2524     {
2525       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
2526
2527       event_data = vlib_process_get_event_data (vm, &event_type);
2528
2529       if (!event_data)
2530         {
2531           /* No events found: timer expired. */
2532           /* process interface list and send RAs as appropriate, update timer info */
2533           ip6_neighbor_process_timer_event (vm, node, frame);
2534         }
2535       else
2536         {
2537           switch (event_type)
2538             {
2539
2540             case ICMP6_ND_EVENT_INIT:
2541               break;
2542
2543             case ~0:
2544               break;
2545
2546             default:
2547               ASSERT (0);
2548             }
2549
2550           if (event_data)
2551             _vec_len (event_data) = 0;
2552         }
2553     }
2554   return frame->n_vectors;
2555 }
2556
2557 /* *INDENT-OFF* */
2558 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
2559 {
2560   .function = icmp6_router_advertisement,
2561   .name = "icmp6-router-advertisement",
2562
2563   .vector_size = sizeof (u32),
2564
2565   .format_trace = format_icmp6_input_trace,
2566
2567   .n_next_nodes = 1,
2568   .next_nodes = {
2569     [0] = "error-drop",
2570   },
2571 };
2572 /* *INDENT-ON* */
2573
2574 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
2575
2576   .function = ip6_icmp_neighbor_discovery_event_process,
2577   .name = "ip6-icmp-neighbor-discovery-event-process",
2578   .type = VLIB_NODE_TYPE_PROCESS,
2579 };
2580
2581 static uword
2582 icmp6_neighbor_solicitation (vlib_main_t * vm,
2583                              vlib_node_runtime_t * node, vlib_frame_t * frame)
2584 {
2585   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
2586                                                        /* is_solicitation */
2587                                                        1);
2588 }
2589
2590 static uword
2591 icmp6_neighbor_advertisement (vlib_main_t * vm,
2592                               vlib_node_runtime_t * node,
2593                               vlib_frame_t * frame)
2594 {
2595   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
2596                                                        /* is_solicitation */
2597                                                        0);
2598 }
2599
2600 /* *INDENT-OFF* */
2601 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
2602 {
2603   .function = icmp6_neighbor_solicitation,
2604   .name = "icmp6-neighbor-solicitation",
2605
2606   .vector_size = sizeof (u32),
2607
2608   .format_trace = format_icmp6_input_trace,
2609
2610   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
2611   .next_nodes = {
2612     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "error-drop",
2613     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
2614   },
2615 };
2616 /* *INDENT-ON* */
2617
2618 /* *INDENT-OFF* */
2619 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
2620 {
2621   .function = icmp6_neighbor_advertisement,
2622   .name = "icmp6-neighbor-advertisement",
2623
2624   .vector_size = sizeof (u32),
2625
2626   .format_trace = format_icmp6_input_trace,
2627
2628   .n_next_nodes = 1,
2629   .next_nodes = {
2630     [0] = "error-drop",
2631   },
2632 };
2633 /* *INDENT-ON* */
2634
2635 /* API support functions */
2636 int
2637 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
2638                         u8 suppress, u8 managed, u8 other,
2639                         u8 ll_option, u8 send_unicast, u8 cease,
2640                         u8 use_lifetime, u32 lifetime,
2641                         u32 initial_count, u32 initial_interval,
2642                         u32 max_interval, u32 min_interval, u8 is_no)
2643 {
2644   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2645   int error;
2646   u32 ri;
2647
2648   /* look up the radv_t  information for this interface */
2649   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2650                            ~0);
2651   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2652   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
2653
2654   if (!error)
2655     {
2656
2657       ip6_radv_t *radv_info;
2658       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2659
2660       if ((max_interval != 0) && (min_interval == 0))
2661         min_interval = .75 * max_interval;
2662
2663       max_interval =
2664         (max_interval !=
2665          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
2666         radv_info->max_radv_interval;
2667       min_interval =
2668         (min_interval !=
2669          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
2670         radv_info->min_radv_interval;
2671       lifetime =
2672         (use_lifetime !=
2673          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
2674         radv_info->adv_router_lifetime_in_sec;
2675
2676       if (lifetime)
2677         {
2678           if (lifetime > MAX_DEF_RTR_LIFETIME)
2679             lifetime = MAX_DEF_RTR_LIFETIME;
2680
2681           if (lifetime <= max_interval)
2682             return VNET_API_ERROR_INVALID_VALUE;
2683         }
2684
2685       if (min_interval != 0)
2686         {
2687           if ((min_interval > .75 * max_interval) || (min_interval < 3))
2688             return VNET_API_ERROR_INVALID_VALUE;
2689         }
2690
2691       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
2692           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
2693         return VNET_API_ERROR_INVALID_VALUE;
2694
2695       /*
2696          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
2697          if "flag" is clear  don't change corresponding value
2698        */
2699       radv_info->send_radv =
2700         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
2701       radv_info->adv_managed_flag =
2702         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
2703       radv_info->adv_other_flag =
2704         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
2705       radv_info->adv_link_layer_address =
2706         (ll_option !=
2707          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
2708       radv_info->send_unicast =
2709         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
2710       radv_info->cease_radv =
2711         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
2712
2713       radv_info->min_radv_interval = min_interval;
2714       radv_info->max_radv_interval = max_interval;
2715       radv_info->adv_router_lifetime_in_sec = lifetime;
2716
2717       radv_info->initial_adverts_count =
2718         (initial_count !=
2719          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
2720         radv_info->initial_adverts_count;
2721       radv_info->initial_adverts_interval =
2722         (initial_interval !=
2723          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
2724         radv_info->initial_adverts_interval;
2725
2726       /* restart */
2727       if ((cease != 0) && (is_no))
2728         radv_info->send_radv = 1;
2729
2730       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
2731       radv_info->next_multicast_time = vlib_time_now (vm);
2732       radv_info->last_multicast_time = vlib_time_now (vm);
2733       radv_info->last_radv_time = 0;
2734     }
2735   return (error);
2736 }
2737
2738 int
2739 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
2740                         ip6_address_t * prefix_addr, u8 prefix_len,
2741                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
2742                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
2743                         u8 no_onlink, u8 is_no)
2744 {
2745   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2746   int error;
2747
2748   u32 ri;
2749
2750   /* look up the radv_t  information for this interface */
2751   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2752                            ~0);
2753
2754   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2755
2756   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
2757
2758   if (!error)
2759     {
2760       f64 now = vlib_time_now (vm);
2761       ip6_radv_t *radv_info;
2762       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2763
2764       /* prefix info add, delete or update */
2765       ip6_radv_prefix_t *prefix;
2766
2767       /* lookup  prefix info for this  address on this interface */
2768       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
2769
2770       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
2771
2772       if (is_no)
2773         {
2774           /* delete */
2775           if (!prefix)
2776             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
2777
2778           if (prefix->prefix_len != prefix_len)
2779             return VNET_API_ERROR_INVALID_VALUE_2;
2780
2781           /* FIXME - Should the DP do this or the CP ? */
2782           /* do specific delete processing here before returning */
2783           /* try to remove from routing table */
2784
2785           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
2786                        /* old_value */ 0);
2787           pool_put (radv_info->adv_prefixes_pool, prefix);
2788
2789           radv_info->initial_adverts_sent =
2790             radv_info->initial_adverts_count - 1;
2791           radv_info->next_multicast_time = vlib_time_now (vm);
2792           radv_info->last_multicast_time = vlib_time_now (vm);
2793           radv_info->last_radv_time = 0;
2794           return (error);
2795         }
2796
2797       /* adding or changing */
2798       if (!prefix)
2799         {
2800           /* add */
2801           u32 pi;
2802           pool_get (radv_info->adv_prefixes_pool, prefix);
2803           pi = prefix - radv_info->adv_prefixes_pool;
2804           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
2805                      /* old_value */ 0);
2806
2807           memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
2808
2809           prefix->prefix_len = prefix_len;
2810           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
2811
2812           /* initialize default values */
2813           prefix->adv_on_link_flag = 1; /* L bit set */
2814           prefix->adv_autonomous_flag = 1;      /* A bit set */
2815           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
2816           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
2817           prefix->enabled = 1;
2818           prefix->decrement_lifetime_flag = 1;
2819           prefix->deprecated_prefix_flag = 1;
2820
2821           if (off_link == 0)
2822             {
2823               /* FIXME - Should the DP do this or the CP ? */
2824               /* insert prefix into routing table as a connected prefix */
2825             }
2826
2827           if (use_default)
2828             goto restart;
2829         }
2830       else
2831         {
2832
2833           if (prefix->prefix_len != prefix_len)
2834             return VNET_API_ERROR_INVALID_VALUE_2;
2835
2836           if (off_link != 0)
2837             {
2838               /* FIXME - Should the DP do this or the CP ? */
2839               /* remove from routing table if already there */
2840             }
2841         }
2842
2843       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
2844         {
2845           prefix->adv_valid_lifetime_in_secs = ~0;
2846           prefix->adv_pref_lifetime_in_secs = ~0;
2847           prefix->decrement_lifetime_flag = 0;
2848         }
2849       else
2850         {
2851           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
2852           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
2853         }
2854
2855       /* copy  remaining */
2856       prefix->enabled = !(no_advertise != 0);
2857       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
2858       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
2859
2860     restart:
2861       /* restart */
2862       /* fill in the expiration times  */
2863       prefix->valid_lifetime_expires =
2864         now + prefix->adv_valid_lifetime_in_secs;
2865       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
2866
2867       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
2868       radv_info->next_multicast_time = vlib_time_now (vm);
2869       radv_info->last_multicast_time = vlib_time_now (vm);
2870       radv_info->last_radv_time = 0;
2871     }
2872   return (error);
2873 }
2874
2875 clib_error_t *
2876 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
2877                   vlib_cli_command_t * cmd)
2878 {
2879   vnet_main_t *vnm = vnet_get_main ();
2880   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2881   clib_error_t *error = 0;
2882   u8 is_no = 0;
2883   u8 suppress = 0, managed = 0, other = 0;
2884   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
2885   u8 use_lifetime = 0;
2886   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
2887     0, ra_initial_interval = 0;
2888   u32 ra_max_interval = 0, ra_min_interval = 0;
2889
2890   unformat_input_t _line_input, *line_input = &_line_input;
2891   vnet_sw_interface_t *sw_if0;
2892
2893   int add_radv_info = 1;
2894   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
2895   ip6_address_t ip6_addr;
2896   u32 addr_len;
2897
2898
2899   /* Get a line of input. */
2900   if (!unformat_user (main_input, unformat_line_input, line_input))
2901     return 0;
2902
2903   /* get basic radv info for this interface */
2904   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2905     {
2906
2907       if (unformat_user (line_input,
2908                          unformat_vnet_sw_interface, vnm, &sw_if_index))
2909         {
2910           u32 ri;
2911           ethernet_interface_t *eth_if0 = 0;
2912
2913           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2914           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2915             eth_if0 =
2916               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2917
2918           if (!eth_if0)
2919             {
2920               error =
2921                 clib_error_return (0, "Interface must be of ethernet type");
2922               goto done;
2923             }
2924
2925           /* look up the radv_t  information for this interface */
2926           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
2927                                    sw_if_index, ~0);
2928
2929           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2930
2931           if (ri != ~0)
2932             {
2933               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2934             }
2935           else
2936             {
2937               error = clib_error_return (0, "unknown interface %U'",
2938                                          format_unformat_error, line_input);
2939               goto done;
2940             }
2941         }
2942       else
2943         {
2944           error = clib_error_return (0, "invalid interface name %U'",
2945                                      format_unformat_error, line_input);
2946           goto done;
2947         }
2948     }
2949
2950   /* get the rest of the command */
2951   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2952     {
2953       if (unformat (line_input, "no"))
2954         is_no = 1;
2955       else if (unformat (line_input, "prefix %U/%d",
2956                          unformat_ip6_address, &ip6_addr, &addr_len))
2957         {
2958           add_radv_info = 0;
2959           break;
2960         }
2961       else if (unformat (line_input, "ra-managed-config-flag"))
2962         {
2963           managed = 1;
2964           break;
2965         }
2966       else if (unformat (line_input, "ra-other-config-flag"))
2967         {
2968           other = 1;
2969           break;
2970         }
2971       else if (unformat (line_input, "ra-suppress") ||
2972                unformat (line_input, "ra-surpress"))
2973         {
2974           suppress = 1;
2975           break;
2976         }
2977       else if (unformat (line_input, "ra-suppress-link-layer") ||
2978                unformat (line_input, "ra-surpress-link-layer"))
2979         {
2980           suppress_ll_option = 1;
2981           break;
2982         }
2983       else if (unformat (line_input, "ra-send-unicast"))
2984         {
2985           send_unicast = 1;
2986           break;
2987         }
2988       else if (unformat (line_input, "ra-lifetime"))
2989         {
2990           if (!unformat (line_input, "%d", &ra_lifetime))
2991             {
2992               error = unformat_parse_error (line_input);
2993               goto done;
2994             }
2995           use_lifetime = 1;
2996           break;
2997         }
2998       else if (unformat (line_input, "ra-initial"))
2999         {
3000           if (!unformat
3001               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3002             {
3003               error = unformat_parse_error (line_input);
3004               goto done;
3005             }
3006           break;
3007         }
3008       else if (unformat (line_input, "ra-interval"))
3009         {
3010           if (!unformat (line_input, "%d", &ra_max_interval))
3011             {
3012               error = unformat_parse_error (line_input);
3013               goto done;
3014             }
3015
3016           if (!unformat (line_input, "%d", &ra_min_interval))
3017             ra_min_interval = 0;
3018           break;
3019         }
3020       else if (unformat (line_input, "ra-cease"))
3021         {
3022           cease = 1;
3023           break;
3024         }
3025       else
3026         {
3027           error = unformat_parse_error (line_input);
3028           goto done;
3029         }
3030     }
3031
3032   if (add_radv_info)
3033     {
3034       ip6_neighbor_ra_config (vm, sw_if_index,
3035                               suppress, managed, other,
3036                               suppress_ll_option, send_unicast, cease,
3037                               use_lifetime, ra_lifetime,
3038                               ra_initial_count, ra_initial_interval,
3039                               ra_max_interval, ra_min_interval, is_no);
3040     }
3041   else
3042     {
3043       u32 valid_lifetime_in_secs = 0;
3044       u32 pref_lifetime_in_secs = 0;
3045       u8 use_prefix_default_values = 0;
3046       u8 no_advertise = 0;
3047       u8 off_link = 0;
3048       u8 no_autoconfig = 0;
3049       u8 no_onlink = 0;
3050
3051       /* get the rest of the command */
3052       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3053         {
3054           if (unformat (line_input, "default"))
3055             {
3056               use_prefix_default_values = 1;
3057               break;
3058             }
3059           else if (unformat (line_input, "infinite"))
3060             {
3061               valid_lifetime_in_secs = ~0;
3062               pref_lifetime_in_secs = ~0;
3063               break;
3064             }
3065           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3066                              &pref_lifetime_in_secs))
3067             break;
3068           else
3069             break;
3070         }
3071
3072
3073       /* get the rest of the command */
3074       while (!use_prefix_default_values &&
3075              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3076         {
3077           if (unformat (line_input, "no-advertise"))
3078             no_advertise = 1;
3079           else if (unformat (line_input, "off-link"))
3080             off_link = 1;
3081           else if (unformat (line_input, "no-autoconfig"))
3082             no_autoconfig = 1;
3083           else if (unformat (line_input, "no-onlink"))
3084             no_onlink = 1;
3085           else
3086             {
3087               error = unformat_parse_error (line_input);
3088               goto done;
3089             }
3090         }
3091
3092       ip6_neighbor_ra_prefix (vm, sw_if_index,
3093                               &ip6_addr, addr_len,
3094                               use_prefix_default_values,
3095                               valid_lifetime_in_secs,
3096                               pref_lifetime_in_secs,
3097                               no_advertise,
3098                               off_link, no_autoconfig, no_onlink, is_no);
3099     }
3100
3101 done:
3102   unformat_free (line_input);
3103
3104   return error;
3105 }
3106
3107 static void
3108 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3109 {
3110   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3111   u32 i;
3112
3113   for (i = 0; i < vec_len (addrs); i++)
3114     {
3115       ip_interface_address_t *a =
3116         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3117       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3118
3119       vlib_cli_output (vm, "\t\t%U/%d",
3120                        format_ip6_address, address, a->address_length);
3121     }
3122 }
3123
3124 static clib_error_t *
3125 show_ip6_interface_cmd (vlib_main_t * vm,
3126                         unformat_input_t * input, vlib_cli_command_t * cmd)
3127 {
3128   vnet_main_t *vnm = vnet_get_main ();
3129   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3130   clib_error_t *error = 0;
3131   u32 sw_if_index;
3132
3133   sw_if_index = ~0;
3134
3135   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3136     {
3137       u32 ri;
3138
3139       /* look up the radv_t  information for this interface */
3140       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3141                                sw_if_index, ~0);
3142
3143       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3144
3145       if (ri != ~0)
3146         {
3147           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3148           ip6_radv_t *radv_info;
3149           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3150
3151           vlib_cli_output (vm, "%U is admin %s\n",
3152                            format_vnet_sw_interface_name, vnm,
3153                            vnet_get_sw_interface (vnm, sw_if_index),
3154                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3155                             "up" : "down"));
3156
3157           u32 ai;
3158           u32 *link_scope = 0, *global_scope = 0;
3159           u32 *local_scope = 0, *unknown_scope = 0;
3160           ip_interface_address_t *a;
3161
3162           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3163                                    sw_if_index, ~0);
3164           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3165
3166           while (ai != (u32) ~ 0)
3167             {
3168               a = pool_elt_at_index (lm->if_address_pool, ai);
3169               ip6_address_t *address =
3170                 ip_interface_address_get_address (lm, a);
3171
3172               if (ip6_address_is_link_local_unicast (address))
3173                 vec_add1 (link_scope, ai);
3174               else if (ip6_address_is_global_unicast (address))
3175                 vec_add1 (global_scope, ai);
3176               else if (ip6_address_is_local_unicast (address))
3177                 vec_add1 (local_scope, ai);
3178               else
3179                 vec_add1 (unknown_scope, ai);
3180
3181               ai = a->next_this_sw_interface;
3182             }
3183
3184           if (vec_len (link_scope))
3185             {
3186               vlib_cli_output (vm, "\tLink-local address(es):\n");
3187               ip6_print_addrs (vm, link_scope);
3188               vec_free (link_scope);
3189             }
3190
3191           if (vec_len (local_scope))
3192             {
3193               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3194               ip6_print_addrs (vm, local_scope);
3195               vec_free (local_scope);
3196             }
3197
3198           if (vec_len (global_scope))
3199             {
3200               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3201               ip6_print_addrs (vm, global_scope);
3202               vec_free (global_scope);
3203             }
3204
3205           if (vec_len (unknown_scope))
3206             {
3207               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3208               ip6_print_addrs (vm, unknown_scope);
3209               vec_free (unknown_scope);
3210             }
3211
3212           vlib_cli_output (vm, "\tJoined group address(es):\n");
3213           ip6_mldp_group_t *m;
3214           /* *INDENT-OFF* */
3215           pool_foreach (m, radv_info->mldp_group_pool,
3216           ({
3217             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3218                              &m->mcast_address);
3219           }));
3220           /* *INDENT-ON* */
3221
3222           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3223           ip6_radv_prefix_t *p;
3224           /* *INDENT-OFF* */
3225           pool_foreach (p, radv_info->adv_prefixes_pool,
3226           ({
3227             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
3228                              format_ip6_address, &p->prefix, p->prefix_len);
3229           }));
3230           /* *INDENT-ON* */
3231
3232           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
3233           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
3234           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
3235           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
3236           vlib_cli_output (vm, "\tND DAD is disabled\n");
3237           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
3238           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
3239                            radv_info->adv_neighbor_reachable_time_in_msec);
3240           vlib_cli_output (vm,
3241                            "\tND advertised retransmit interval is %d (msec)\n",
3242                            radv_info->
3243                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
3244
3245           u32 ra_interval = radv_info->max_radv_interval;
3246           u32 ra_interval_min = radv_info->min_radv_interval;
3247           vlib_cli_output (vm,
3248                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
3249                            ra_interval, ra_interval_min);
3250           vlib_cli_output (vm,
3251                            "\tND router advertisements live for %d seconds\n",
3252                            radv_info->adv_router_lifetime_in_sec);
3253           vlib_cli_output (vm,
3254                            "\tHosts %s stateless autoconfig for addresses\n",
3255                            (radv_info->adv_managed_flag) ? "use" :
3256                            " don't use");
3257           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
3258                            radv_info->n_advertisements_sent);
3259           vlib_cli_output (vm, "\tND router solicitations received %d\n",
3260                            radv_info->n_solicitations_rcvd);
3261           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
3262                            radv_info->n_solicitations_dropped);
3263         }
3264       else
3265         {
3266           error = clib_error_return (0, "IPv6 not enabled on interface",
3267                                      format_unformat_error, input);
3268
3269         }
3270     }
3271   return error;
3272 }
3273
3274 /*?
3275  * This command is used to display various IPv6 attributes on a given
3276  * interface.
3277  *
3278  * @cliexpar
3279  * Example of how to display IPv6 settings:
3280  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
3281  * GigabitEthernet2/0/0 is admin up
3282  *         Link-local address(es):
3283  *                 fe80::ab8/64
3284  *         Joined group address(es):
3285  *                 ff02::1
3286  *                 ff02::2
3287  *                 ff02::16
3288  *                 ff02::1:ff00:ab8
3289  *         Advertised Prefixes:
3290  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
3291  *         MTU is 1500
3292  *         ICMP error messages are unlimited
3293  *         ICMP redirects are disabled
3294  *         ICMP unreachables are not sent
3295  *         ND DAD is disabled
3296  *         ND advertised reachable time is 0
3297  *         ND advertised retransmit interval is 0 (msec)
3298  *         ND router advertisements are sent every 200 seconds (min interval is 150)
3299  *         ND router advertisements live for 600 seconds
3300  *         Hosts use stateless autoconfig for addresses
3301  *         ND router advertisements sent 19336
3302  *         ND router solicitations received 0
3303  *         ND router solicitations dropped 0
3304  * @cliexend
3305  * Example of output if IPv6 is not enabled on the interface:
3306  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
3307  * show ip6 interface: IPv6 not enabled on interface
3308  * @cliexend
3309 ?*/
3310 /* *INDENT-OFF* */
3311 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
3312 {
3313   .path = "show ip6 interface",
3314   .function = show_ip6_interface_cmd,
3315   .short_help = "show ip6 interface <interface>",
3316 };
3317 /* *INDENT-ON* */
3318
3319 clib_error_t *
3320 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
3321 {
3322   clib_error_t *error = 0;
3323   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3324   u32 ri;
3325
3326   /* look up the radv_t  information for this interface */
3327   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3328                            ~0);
3329   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3330
3331   /* if not created - do nothing */
3332   if (ri != ~0)
3333     {
3334       vnet_main_t *vnm = vnet_get_main ();
3335       ip6_radv_t *radv_info;
3336
3337       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3338
3339       /* check radv_info ref count for other ip6 addresses on this interface */
3340       /* This implicitly excludes the link local address */
3341       if (radv_info->ref_count == 0)
3342         {
3343           /* essentially "disables" ipv6 on this interface */
3344           error = ip6_add_del_interface_address (vm, sw_if_index,
3345                                                  &radv_info->
3346                                                  link_local_address, 128,
3347                                                  1 /* is_del */ );
3348
3349           ip6_neighbor_sw_interface_add_del (vnm, sw_if_index,
3350                                              0 /* is_add */ );
3351           ip6_mfib_interface_enable_disable (sw_if_index, 0);
3352         }
3353     }
3354   return error;
3355 }
3356
3357 int
3358 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
3359 {
3360   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3361   u32 ri = ~0;
3362
3363   /* look up the radv_t  information for this interface */
3364   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3365                            ~0);
3366
3367   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3368
3369   return ri != ~0;
3370 }
3371
3372 clib_error_t *
3373 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
3374 {
3375   clib_error_t *error = 0;
3376   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3377   u32 ri;
3378   int is_add = 1;
3379
3380   /* look up the radv_t  information for this interface */
3381   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3382                            ~0);
3383
3384   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3385
3386   /* if not created yet */
3387   if (ri == ~0)
3388     {
3389       vnet_main_t *vnm = vnet_get_main ();
3390       vnet_sw_interface_t *sw_if0;
3391
3392       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3393       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3394         {
3395           ethernet_interface_t *eth_if0;
3396
3397           eth_if0 =
3398             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3399           if (eth_if0)
3400             {
3401               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
3402               ri =
3403                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
3404
3405               if (ri != ~0)
3406                 {
3407                   ip6_radv_t *radv_info;
3408                   ip6_address_t link_local_address;
3409
3410                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3411
3412                   ip6_link_local_address_from_ethernet_mac_address
3413                     (&link_local_address, eth_if0->address);
3414
3415                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
3416                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB)
3417                     {
3418                       /* make up  an interface id */
3419                       md5_context_t m;
3420                       u8 digest[16];
3421
3422                       link_local_address.as_u64[0] = radv_info->randomizer;
3423
3424                       md5_init (&m);
3425                       md5_add (&m, &link_local_address, 16);
3426                       md5_finish (&m, digest);
3427
3428                       clib_memcpy (&link_local_address, digest, 16);
3429
3430                       radv_info->randomizer = link_local_address.as_u64[0];
3431
3432                       link_local_address.as_u64[0] =
3433                         clib_host_to_net_u64 (0xFE80000000000000ULL);
3434                       /* clear u bit */
3435                       link_local_address.as_u8[8] &= 0xfd;
3436                     }
3437
3438                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
3439
3440                   /* essentially "enables" ipv6 on this interface */
3441                   error = ip6_add_del_interface_address (vm, sw_if_index,
3442                                                          &link_local_address,
3443                                                          128
3444                                                          /* address width */ ,
3445                                                          0 /* is_del */ );
3446
3447                   if (error)
3448                     ip6_neighbor_sw_interface_add_del (vnm, sw_if_index,
3449                                                        !is_add);
3450                   else
3451                     {
3452                       radv_info->link_local_address = link_local_address;
3453                     }
3454                 }
3455             }
3456         }
3457     }
3458   return error;
3459 }
3460
3461 static clib_error_t *
3462 enable_ip6_interface_cmd (vlib_main_t * vm,
3463                           unformat_input_t * input, vlib_cli_command_t * cmd)
3464 {
3465   vnet_main_t *vnm = vnet_get_main ();
3466   clib_error_t *error = 0;
3467   u32 sw_if_index;
3468
3469   sw_if_index = ~0;
3470
3471   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3472     {
3473       enable_ip6_interface (vm, sw_if_index);
3474     }
3475   else
3476     {
3477       error = clib_error_return (0, "unknown interface\n'",
3478                                  format_unformat_error, input);
3479
3480     }
3481   return error;
3482 }
3483
3484 /*?
3485  * This command is used to enable IPv6 on a given interface.
3486  *
3487  * @cliexpar
3488  * Example of how enable IPv6 on a given interface:
3489  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
3490 ?*/
3491 /* *INDENT-OFF* */
3492 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
3493 {
3494   .path = "enable ip6 interface",
3495   .function = enable_ip6_interface_cmd,
3496   .short_help = "enable ip6 interface <interface>",
3497 };
3498 /* *INDENT-ON* */
3499
3500 static clib_error_t *
3501 disable_ip6_interface_cmd (vlib_main_t * vm,
3502                            unformat_input_t * input, vlib_cli_command_t * cmd)
3503 {
3504   vnet_main_t *vnm = vnet_get_main ();
3505   clib_error_t *error = 0;
3506   u32 sw_if_index;
3507
3508   sw_if_index = ~0;
3509
3510   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3511     {
3512       error = disable_ip6_interface (vm, sw_if_index);
3513     }
3514   else
3515     {
3516       error = clib_error_return (0, "unknown interface\n'",
3517                                  format_unformat_error, input);
3518
3519     }
3520   return error;
3521 }
3522
3523 /*?
3524  * This command is used to disable IPv6 on a given interface.
3525  *
3526  * @cliexpar
3527  * Example of how disable IPv6 on a given interface:
3528  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
3529 ?*/
3530 /* *INDENT-OFF* */
3531 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
3532 {
3533   .path = "disable ip6 interface",
3534   .function = disable_ip6_interface_cmd,
3535   .short_help = "disable ip6 interface <interface>",
3536 };
3537 /* *INDENT-ON* */
3538
3539 /*?
3540  * This command is used to configure the neighbor discovery
3541  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
3542  * command to display some of the current neighbor discovery parameters
3543  * on a given interface. This command has three formats:
3544  *
3545  *
3546  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
3547  *
3548  * '<em><b>ip6 nd <interface> [no] [ra-managed-config-flag] | [ra-other-config-flag] | [ra-suppress] | [ra-suppress-link-layer] | [ra-send-unicast] | [ra-lifetime <lifetime>] | [ra-initial <cnt> <interval>] | [ra-interval <max-interval> [<min-interval>]] | [ra-cease]</b></em>'
3549  *
3550  * Where:
3551  *
3552  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
3553  * router-advertisement messages to use stateful address
3554  * auto-configuration to obtain address information (sets the M-bit).
3555  * Default is the M-bit is not set and the '<em>no</em>' option
3556  * returns it to this default state.
3557  *
3558  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
3559  * router-advertisement messages that hosts use stateful auto
3560  * configuration to obtain nonaddress related information (sets
3561  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
3562  * option returns it to this default state.
3563  *
3564  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
3565  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
3566  * router-advertisement messages.
3567  *
3568  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
3569  * optional source link-layer address in the ICMPv6 router-advertisement
3570  * messages. Default is to include the optional source link-layer address
3571  * and the '<em>no</em>' option returns it to this default state.
3572  *
3573  * <em>[no] ra-send-unicast</em> - Use the source address of the
3574  * router-solicitation message if availiable. The default is to use
3575  * multicast address of all nodes, and the '<em>no</em>' option returns
3576  * it to this default state.
3577  *
3578  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
3579  * default router in ICMPv6 router-advertisement messages. The range is
3580  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
3581  * '<em><max-interval></em>'. The default value is 600 seconds and the
3582  * '<em>no</em>' option returns it to this default value.
3583  *
3584  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
3585  * router-advertisement messages sent and the interval between each
3586  * message. Range for count is 1 - 3 and default is 3. Range for interval
3587  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
3588  * returns both to their default value.
3589  *
3590  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
3591  * interval between sending ICMPv6 router-advertisement messages. The
3592  * range for max-interval is from 4 to 200 seconds. min-interval can not
3593  * be more than 75% of max-interval. If not set, min-interval will be
3594  * set to 75% of max-interval. The range for min-interval is from 3 to
3595  * 150 seconds.  The '<em>no</em>' option returns both to their default
3596  * value.
3597  *
3598  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
3599  * The '<em>no</em>' options implies to start (or restart) sending
3600  * ICMPv6 router-advertisement messages.
3601  *
3602  *
3603  * <b>Format 2 - Prefix Options:</b>
3604  *
3605  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> [<valid-lifetime> <pref-lifetime> | infinite] [no-advertise] [off-link] [no-autoconfig] [no-onlink]</b></em>'
3606  *
3607  * Where:
3608  *
3609  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
3610  *
3611  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
3612  * length of time in seconds during what the prefix is valid for the purpose of
3613  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
3614  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
3615  * length of time in seconds during what addresses generated from the prefix remain
3616  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
3617  *
3618  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
3619  * are inifinte, no timeout.
3620  *
3621  * <em>no-advertise</em> - Do not send full router address in prefix
3622  * advertisement. Default is to advertise (i.e. - This flag is off by default).
3623  *
3624  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
3625  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
3626  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
3627  *
3628  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
3629  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
3630  *
3631  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
3632  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
3633  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
3634  * the L-bit.
3635  *
3636  *
3637  * <b>Format 3: - Default of Prefix:</b>
3638  *
3639  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
3640  *
3641  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
3642  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
3643  * is ignored and the prefix is deleted.
3644  *
3645  *
3646  * @cliexpar
3647  * Example of how set a router advertisement option:
3648  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
3649  * Example of how to add a prefix:
3650  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
3651  * Example of how to delete a prefix:
3652  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
3653 ?*/
3654 /* *INDENT-OFF* */
3655 VLIB_CLI_COMMAND (ip6_nd_command, static) =
3656 {
3657   .path = "ip6 nd",
3658   .short_help = "ip6 nd <interface> ...",
3659   .function = ip6_neighbor_cmd,
3660 };
3661 /* *INDENT-ON* */
3662
3663 clib_error_t *
3664 set_ip6_link_local_address (vlib_main_t * vm,
3665                             u32 sw_if_index, ip6_address_t * address)
3666 {
3667   clib_error_t *error = 0;
3668   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3669   u32 ri;
3670   ip6_radv_t *radv_info;
3671   vnet_main_t *vnm = vnet_get_main ();
3672
3673   if (!ip6_address_is_link_local_unicast (address))
3674     {
3675       vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_LINK_LOCAL;
3676       return (error = clib_error_return (0, "address not link-local",
3677                                          format_unformat_error));
3678     }
3679
3680   /* call enable ipv6  */
3681   enable_ip6_interface (vm, sw_if_index);
3682
3683   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3684
3685   if (ri != ~0)
3686     {
3687       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3688
3689       /* save if link local address (overwrite default) */
3690
3691       /* delete the old one */
3692       error = ip6_add_del_interface_address (vm, sw_if_index,
3693                                              &radv_info->link_local_address,
3694                                              128, 1 /* is_del */ );
3695
3696       if (!error)
3697         {
3698           /* add the new one */
3699           error = ip6_add_del_interface_address (vm, sw_if_index,
3700                                                  address, 128,
3701                                                  0 /* is_del */ );
3702
3703           if (!error)
3704             {
3705               radv_info->link_local_address = *address;
3706             }
3707         }
3708     }
3709   else
3710     {
3711       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
3712       error = clib_error_return (0, "ip6 not enabled for interface",
3713                                  format_unformat_error);
3714     }
3715   return error;
3716 }
3717
3718 clib_error_t *
3719 set_ip6_link_local_address_cmd (vlib_main_t * vm,
3720                                 unformat_input_t * input,
3721                                 vlib_cli_command_t * cmd)
3722 {
3723   vnet_main_t *vnm = vnet_get_main ();
3724   clib_error_t *error = 0;
3725   u32 sw_if_index;
3726   ip6_address_t ip6_addr;
3727
3728   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3729     {
3730       /* get the rest of the command */
3731       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3732         {
3733           if (unformat (input, "%U", unformat_ip6_address, &ip6_addr))
3734             break;
3735           else
3736             return (unformat_parse_error (input));
3737         }
3738     }
3739   error = set_ip6_link_local_address (vm, sw_if_index, &ip6_addr);
3740   return error;
3741 }
3742
3743 /*?
3744  * This command is used to assign an IPv6 Link-local address to an
3745  * interface. This command will enable IPv6 on an interface if it
3746  * is not already enabled. Use the '<em>show ip6 interface</em>' command
3747  * to display the assigned Link-local address.
3748  *
3749  * @cliexpar
3750  * Example of how to assign an IPv6 Link-local address to an interface:
3751  * @cliexcmd{set ip6 link-local address GigabitEthernet2/0/0 FE80::AB8}
3752 ?*/
3753 /* *INDENT-OFF* */
3754 VLIB_CLI_COMMAND (set_ip6_link_local_address_command, static) =
3755 {
3756   .path = "set ip6 link-local address",
3757   .short_help = "set ip6 link-local address <interface> <ip6-address>",
3758   .function = set_ip6_link_local_address_cmd,
3759 };
3760 /* *INDENT-ON* */
3761
3762 /**
3763  * @brief callback when an interface address is added or deleted
3764  */
3765 static void
3766 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
3767                                         uword opaque,
3768                                         u32 sw_if_index,
3769                                         ip6_address_t * address,
3770                                         u32 address_length,
3771                                         u32 if_address_index, u32 is_delete)
3772 {
3773   vnet_main_t *vnm = vnet_get_main ();
3774   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3775   u32 ri;
3776   vlib_main_t *vm = vnm->vlib_main;
3777   ip6_radv_t *radv_info;
3778   ip6_address_t a;
3779
3780   /* create solicited node multicast address for this interface adddress */
3781   ip6_set_solicited_node_multicast_address (&a, 0);
3782
3783   a.as_u8[0xd] = address->as_u8[0xd];
3784   a.as_u8[0xe] = address->as_u8[0xe];
3785   a.as_u8[0xf] = address->as_u8[0xf];
3786
3787   if (!is_delete)
3788     {
3789       /* try to  create radv_info - does nothing if ipv6 already enabled */
3790       enable_ip6_interface (vm, sw_if_index);
3791
3792       /* look up the radv_t  information for this interface */
3793       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3794                                sw_if_index, ~0);
3795       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3796       if (ri != ~0)
3797         {
3798           /* get radv_info */
3799           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3800
3801           /* add address */
3802           if (!ip6_address_is_link_local_unicast (address))
3803             radv_info->ref_count++;
3804
3805           ip6_neighbor_add_mld_prefix (radv_info, &a);
3806         }
3807     }
3808   else
3809     {
3810
3811       /* delete */
3812       /* look up the radv_t  information for this interface */
3813       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3814                                sw_if_index, ~0);
3815       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3816
3817       if (ri != ~0)
3818         {
3819           /* get radv_info */
3820           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3821
3822           ip6_neighbor_del_mld_prefix (radv_info, &a);
3823
3824           /* if interface up send MLDP "report" */
3825           radv_info->all_routers_mcast = 0;
3826
3827           /* add address */
3828           if (!ip6_address_is_link_local_unicast (address))
3829             radv_info->ref_count--;
3830         }
3831       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
3832       disable_ip6_interface (vm, sw_if_index);
3833     }
3834 }
3835
3836 clib_error_t *
3837 ip6_set_neighbor_limit (u32 neighbor_limit)
3838 {
3839   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3840
3841   nm->limit_neighbor_cache_size = neighbor_limit;
3842   return 0;
3843 }
3844
3845 static clib_error_t *
3846 ip6_neighbor_init (vlib_main_t * vm)
3847 {
3848   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3849   ip6_main_t *im = &ip6_main;
3850
3851   mhash_init (&nm->neighbor_index_by_key,
3852               /* value size */ sizeof (uword),
3853               /* key size */ sizeof (ip6_neighbor_key_t));
3854
3855   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
3856                        ip6_icmp_neighbor_solicitation_node.index);
3857   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
3858                        ip6_icmp_neighbor_advertisement_node.index);
3859   icmp6_register_type (vm, ICMP6_router_solicitation,
3860                        ip6_icmp_router_solicitation_node.index);
3861   icmp6_register_type (vm, ICMP6_router_advertisement,
3862                        ip6_icmp_router_advertisement_node.index);
3863
3864   /* handler node for ip6 neighbor discovery events and timers */
3865   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
3866
3867   /* add call backs */
3868   ip6_add_del_interface_address_callback_t cb;
3869   memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
3870
3871   /* when an interface address changes... */
3872   cb.function = ip6_neighbor_add_del_interface_address;
3873   cb.function_opaque = 0;
3874   vec_add1 (im->add_del_interface_address_callbacks, cb);
3875
3876   mhash_init (&nm->pending_resolutions_by_address,
3877               /* value size */ sizeof (uword),
3878               /* key size */ sizeof (ip6_address_t));
3879
3880   mhash_init (&nm->mac_changes_by_address,
3881               /* value size */ sizeof (uword),
3882               /* key size */ sizeof (ip6_address_t));
3883
3884   /* default, configurable */
3885   nm->limit_neighbor_cache_size = 50000;
3886
3887 #if 0
3888   /* $$$$ Hack fix for today */
3889   vec_validate_init_empty
3890     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
3891 #endif
3892
3893   return 0;
3894 }
3895
3896 VLIB_INIT_FUNCTION (ip6_neighbor_init);
3897
3898
3899 void
3900 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
3901                                              void *address_arg,
3902                                              uword node_index,
3903                                              uword type_opaque, uword data)
3904 {
3905   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3906   ip6_address_t *address = address_arg;
3907   uword *p;
3908   pending_resolution_t *pr;
3909
3910   pool_get (nm->pending_resolutions, pr);
3911
3912   pr->next_index = ~0;
3913   pr->node_index = node_index;
3914   pr->type_opaque = type_opaque;
3915   pr->data = data;
3916
3917   p = mhash_get (&nm->pending_resolutions_by_address, address);
3918   if (p)
3919     {
3920       /* Insert new resolution at the head of the list */
3921       pr->next_index = p[0];
3922       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
3923     }
3924
3925   mhash_set (&nm->pending_resolutions_by_address, address,
3926              pr - nm->pending_resolutions, 0 /* old value */ );
3927 }
3928
3929 int
3930 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
3931                                   void *data_callback,
3932                                   u32 pid,
3933                                   void *address_arg,
3934                                   uword node_index,
3935                                   uword type_opaque, uword data, int is_add)
3936 {
3937   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3938   ip6_address_t *address = address_arg;
3939
3940   /* Try to find an existing entry */
3941   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
3942   u32 *p = first;
3943   pending_resolution_t *mc;
3944   while (p && *p != ~0)
3945     {
3946       mc = pool_elt_at_index (nm->mac_changes, *p);
3947       if (mc->node_index == node_index && mc->type_opaque == type_opaque
3948           && mc->pid == pid)
3949         break;
3950       p = &mc->next_index;
3951     }
3952
3953   int found = p && *p != ~0;
3954   if (is_add)
3955     {
3956       if (found)
3957         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
3958
3959       pool_get (nm->mac_changes, mc);
3960       *mc = (pending_resolution_t)
3961       {
3962       .next_index = ~0,.node_index = node_index,.type_opaque =
3963           type_opaque,.data = data,.data_callback = data_callback,.pid =
3964           pid,};
3965
3966       /* Insert new resolution at the end of the list */
3967       u32 new_idx = mc - nm->mac_changes;
3968       if (p)
3969         p[0] = new_idx;
3970       else
3971         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
3972     }
3973   else
3974     {
3975       if (!found)
3976         return VNET_API_ERROR_NO_SUCH_ENTRY;
3977
3978       /* Clients may need to clean up pool entries, too */
3979       void (*fp) (u32, u8 *) = data_callback;
3980       if (fp)
3981         (*fp) (mc->data, 0 /* no new mac addrs */ );
3982
3983       /* Remove the entry from the list and delete the entry */
3984       *p = mc->next_index;
3985       pool_put (nm->mac_changes, mc);
3986
3987       /* Remove from hash if we deleted the last entry */
3988       if (*p == ~0 && p == first)
3989         mhash_unset (&nm->mac_changes_by_address, address, 0);
3990     }
3991   return 0;
3992 }
3993
3994 int
3995 vnet_ip6_nd_term (vlib_main_t * vm,
3996                   vlib_node_runtime_t * node,
3997                   vlib_buffer_t * p0,
3998                   ethernet_header_t * eth,
3999                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4000 {
4001   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4002   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4003   pending_resolution_t *mc;
4004
4005   ndh = ip6_next_header (ip);
4006   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4007       ndh->icmp.type != ICMP6_neighbor_advertisement)
4008     return 0;
4009
4010   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4011                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4012     {
4013       u8 *t0 = vlib_add_trace (vm, node, p0,
4014                                sizeof (icmp6_input_trace_t));
4015       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4016     }
4017
4018   /* Check if anyone want ND events for L2 BDs */
4019   uword *p = mhash_get (&nm->mac_changes_by_address, &ip6a_zero);
4020   if (p && !ip6_address_is_link_local_unicast (&ip->src_address))
4021     {
4022       u32 next_index = p[0];
4023       while (next_index != (u32) ~ 0)
4024         {
4025           int (*fp) (u32, u8 *, u32, ip6_address_t *);
4026           int rv = 1;
4027           mc = pool_elt_at_index (nm->mac_changes, next_index);
4028           fp = mc->data_callback;
4029           /* Call the callback, return 1 to suppress dup events */
4030           if (fp)
4031             rv = (*fp) (mc->data,
4032                         eth->src_address, sw_if_index, &ip->src_address);
4033           /* Signal the resolver process */
4034           if (rv == 0)
4035             vlib_process_signal_event (vm, mc->node_index,
4036                                        mc->type_opaque, mc->data);
4037           next_index = mc->next_index;
4038         }
4039     }
4040
4041   /* Check if MAC entry exsist for solicited target IP */
4042   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4043     {
4044       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4045       l2_bridge_domain_t *bd_config;
4046       u8 *macp;
4047
4048       opt = (void *) (ndh + 1);
4049       if ((opt->header.type !=
4050            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4051           (opt->header.n_data_u64s != 1))
4052         return 0;               /* source link layer address option not present */
4053
4054       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4055       macp =
4056         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4057       if (macp)
4058         {                       /* found ip-mac entry, generate eighbor advertisement response */
4059           int bogus_length;
4060           vlib_node_runtime_t *error_node =
4061             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4062           ip->dst_address = ip->src_address;
4063           ip->src_address = ndh->target_address;
4064           ip->hop_limit = 255;
4065           opt->header.type =
4066             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4067           clib_memcpy (opt->ethernet_address, macp, 6);
4068           ndh->icmp.type = ICMP6_neighbor_advertisement;
4069           ndh->advertisement_flags = clib_host_to_net_u32
4070             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4071              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4072           ndh->icmp.checksum = 0;
4073           ndh->icmp.checksum =
4074             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4075           clib_memcpy (eth->dst_address, eth->src_address, 6);
4076           clib_memcpy (eth->src_address, macp, 6);
4077           vlib_error_count (vm, error_node->node_index,
4078                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4079           return 1;
4080         }
4081     }
4082
4083   return 0;
4084
4085 }
4086
4087 int
4088 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4089 {
4090   u32 fib_index;
4091
4092   fib_prefix_t pfx = {
4093     .fp_len = 128,
4094     .fp_proto = FIB_PROTOCOL_IP6,
4095     .fp_addr = {
4096                 .ip6 = *addr,
4097                 },
4098   };
4099   ip46_address_t nh = {
4100     .ip6 = *addr,
4101   };
4102
4103   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4104
4105   if (~0 == fib_index)
4106     return VNET_API_ERROR_NO_SUCH_FIB;
4107
4108   if (is_del)
4109     {
4110       fib_table_entry_path_remove (fib_index,
4111                                    &pfx,
4112                                    FIB_SOURCE_IP6_ND_PROXY,
4113                                    DPO_PROTO_IP6,
4114                                    &nh,
4115                                    sw_if_index,
4116                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4117       /* flush the ND cache of this address if it's there */
4118       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (),
4119                                         sw_if_index, addr, NULL, 0);
4120     }
4121   else
4122     {
4123       fib_table_entry_path_add (fib_index,
4124                                 &pfx,
4125                                 FIB_SOURCE_IP6_ND_PROXY,
4126                                 FIB_ENTRY_FLAG_NONE,
4127                                 DPO_PROTO_IP6,
4128                                 &nh,
4129                                 sw_if_index,
4130                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4131     }
4132   return (0);
4133 }
4134
4135 static clib_error_t *
4136 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4137                       unformat_input_t * input, vlib_cli_command_t * cmd)
4138 {
4139   vnet_main_t *vnm = vnet_get_main ();
4140   clib_error_t *error = 0;
4141   ip6_address_t addr;
4142   u32 sw_if_index;
4143   u8 is_del = 0;
4144
4145   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4146     {
4147       /* get the rest of the command */
4148       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4149         {
4150           if (unformat (input, "%U", unformat_ip6_address, &addr))
4151             break;
4152           else if (unformat (input, "delete") || unformat (input, "del"))
4153             is_del = 1;
4154           else
4155             return (unformat_parse_error (input));
4156         }
4157     }
4158
4159   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4160
4161   return error;
4162 }
4163
4164 /* *INDENT-OFF* */
4165 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4166 {
4167   .path = "set ip6 nd proxy",
4168   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4169   .function = set_ip6_nd_proxy_cmd,
4170 };
4171 /* *INDENT-ON* */
4172
4173 void
4174 ethernet_ndp_change_mac (u32 sw_if_index)
4175 {
4176   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4177   ip6_neighbor_t *n;
4178
4179   /* *INDENT-OFF* */
4180   pool_foreach (n, nm->neighbor_pool,
4181   ({
4182     if (n->key.sw_if_index == sw_if_index)
4183       {
4184         adj_nbr_walk_nh6 (sw_if_index,
4185                           &n->key.ip6_address,
4186                           ip6_nd_mk_complete_walk, n);
4187       }
4188   }));
4189   /* *INDENT-ON* */
4190 }
4191
4192 void
4193 send_ip6_na (vlib_main_t * vm, vnet_hw_interface_t * hi)
4194 {
4195   ip6_main_t *i6m = &ip6_main;
4196   u32 sw_if_index = hi->sw_if_index;
4197   ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index);
4198   if (ip6_addr)
4199     {
4200       clib_warning
4201         ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
4202          format_ip6_address, ip6_addr, sw_if_index);
4203
4204       /* Form unsolicited neighbor advertisement packet from NS pkt template */
4205       int bogus_length;
4206       u32 bi = 0;
4207       icmp6_neighbor_solicitation_header_t *h =
4208         vlib_packet_template_get_packet (vm,
4209                                          &i6m->discover_neighbor_packet_template,
4210                                          &bi);
4211       ip6_set_reserved_multicast_address (&h->ip.dst_address,
4212                                           IP6_MULTICAST_SCOPE_link_local,
4213                                           IP6_MULTICAST_GROUP_ID_all_hosts);
4214       h->ip.src_address = ip6_addr[0];
4215       h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
4216       h->neighbor.target_address = ip6_addr[0];
4217       h->neighbor.advertisement_flags = clib_host_to_net_u32
4218         (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4219       clib_memcpy (h->link_layer_option.ethernet_address,
4220                    hi->hw_address, vec_len (hi->hw_address));
4221       h->neighbor.icmp.checksum =
4222         ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
4223       ASSERT (bogus_length == 0);
4224
4225       /* Setup MAC header with IP6 Etype and mcast DMAC */
4226       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
4227       vlib_buffer_advance (b, -sizeof (ethernet_header_t));
4228       ethernet_header_t *e = vlib_buffer_get_current (b);
4229       e->type = clib_host_to_net_u16 (ETHERNET_TYPE_IP6);
4230       clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
4231       ip6_multicast_ethernet_address (e->dst_address,
4232                                       IP6_MULTICAST_GROUP_ID_all_hosts);
4233
4234       /* Send unsolicited ND advertisement packet out the specified interface */
4235       vnet_buffer (b)->sw_if_index[VLIB_RX] =
4236         vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
4237       vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
4238       u32 *to_next = vlib_frame_vector_args (f);
4239       to_next[0] = bi;
4240       f->n_vectors = 1;
4241       vlib_put_frame_to_node (vm, hi->output_node_index, f);
4242     }
4243 }
4244
4245 /*
4246  * fd.io coding-style-patch-verification: ON
4247  *
4248  * Local Variables:
4249  * eval: (c-set-style "gnu")
4250  * End:
4251  */