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 <vnet/adj/adj.h>
  23 #include <vnet/adj/adj_mcast.h>
  24 #include <vnet/fib/fib_table.h>
  25 #include <vnet/fib/ip6_fib.h>
  26 #include <vnet/mfib/ip6_mfib.h>
  27 #include <vnet/ip/ip6_ll_table.h>
  28 #include <vnet/l2/l2_input.h>
  29 #include <vlibmemory/api.h>
  30
  31 /**
  32  * @file
  33  * @brief IPv6 Neighbor Adjacency and Neighbor Discovery.
  34  *
  35  * The files contains the API and CLI code for managing IPv6 neighbor
  36  * adjacency tables and neighbor discovery logic.
  37  */
  38
  39 /* can't use sizeof link_layer_address, that's 8 */
  40 #define ETHER_MAC_ADDR_LEN 6
  41
  42 /* advertised prefix option */
  43 typedef struct
  44 {
  45   /* basic advertised information */
  46   ip6_address_t prefix;
  47   u8 prefix_len;
  48   int adv_on_link_flag;
  49   int adv_autonomous_flag;
  50   u32 adv_valid_lifetime_in_secs;
  51   u32 adv_pref_lifetime_in_secs;
  52
  53   /* advertised values are computed from these times if decrementing */
  54   f64 valid_lifetime_expires;
  55   f64 pref_lifetime_expires;
  56
  57   /* local information */
  58   int enabled;
  59   int deprecated_prefix_flag;
  60   int decrement_lifetime_flag;
  61
  62 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  63 #define DEF_ADV_VALID_LIFETIME  2592000
  64 #define DEF_ADV_PREF_LIFETIME 604800
  65
  66   /* extensions are added here, mobile, DNS etc.. */
  67 } ip6_radv_prefix_t;
  68
  69
  70 typedef struct
  71 {
  72   /* group information */
  73   u8 type;
  74   ip6_address_t mcast_address;
  75   u16 num_sources;
  76   ip6_address_t *mcast_source_address_pool;
  77 } ip6_mldp_group_t;
  78
  79 /* configured router advertisement information per ipv6 interface */
  80 typedef struct
  81 {
  82
  83   /* advertised config information, zero means unspecified  */
  84   u8 curr_hop_limit;
  85   int adv_managed_flag;
  86   int adv_other_flag;
  87   u16 adv_router_lifetime_in_sec;
  88   u32 adv_neighbor_reachable_time_in_msec;
  89   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
  90
  91   /* mtu option */
  92   u32 adv_link_mtu;
  93
  94   /* source link layer option */
  95   u8 link_layer_address[8];
  96   u8 link_layer_addr_len;
  97
  98   /* prefix option */
  99   ip6_radv_prefix_t *adv_prefixes_pool;
 100
 101   /* Hash table mapping address to index in interface advertised  prefix pool. */
 102   mhash_t address_to_prefix_index;
 103
 104   /* MLDP  group information */
 105   ip6_mldp_group_t *mldp_group_pool;
 106
 107   /* Hash table mapping address to index in mldp address pool. */
 108   mhash_t address_to_mldp_index;
 109
 110   /* local information */
 111   u32 sw_if_index;
 112   int send_radv;                /* radv on/off on this interface -  set by config */
 113   int cease_radv;               /* we are ceasing  to send  - set byf config */
 114   int send_unicast;
 115   int adv_link_layer_address;
 116   int prefix_option;
 117   int failed_device_check;
 118   int all_routers_mcast;
 119   u32 seed;
 120   u64 randomizer;
 121   int ref_count;
 122   adj_index_t mcast_adj_index;
 123
 124   /* timing information */
 125 #define DEF_MAX_RADV_INTERVAL 200
 126 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
 127 #define DEF_CURR_HOP_LIMIT  64
 128 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
 129 #define MAX_DEF_RTR_LIFETIME   9000
 130
 131 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
 132 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
 133 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
 134 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
 135 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
 136
 137   f64 max_radv_interval;
 138   f64 min_radv_interval;
 139   f64 min_delay_between_radv;
 140   f64 max_delay_between_radv;
 141   f64 max_rtr_default_lifetime;
 142
 143   f64 last_radv_time;
 144   f64 last_multicast_time;
 145   f64 next_multicast_time;
 146
 147
 148   u32 initial_adverts_count;
 149   f64 initial_adverts_interval;
 150   u32 initial_adverts_sent;
 151
 152   /* stats */
 153   u32 n_advertisements_sent;
 154   u32 n_solicitations_rcvd;
 155   u32 n_solicitations_dropped;
 156
 157   /* Link local address to use (defaults to underlying physical for logical interfaces */
 158   ip6_address_t link_local_address;
 159
 160   /* router solicitations sending state */
 161   u8 keep_sending_rs;           /* when true then next fields are valid */
 162   icmp6_send_router_solicitation_params_t params;
 163   f64 sleep_interval;
 164   f64 due_time;
 165   u32 n_left;
 166   f64 start_time;
 167   vlib_buffer_t *buffer;
 168 } ip6_radv_t;
 169
 170 typedef struct
 171 {
 172   u32 next_index;
 173   uword node_index;
 174   uword type_opaque;
 175   uword data;
 176   /* Used for nd event notification only */
 177   ip6_nd_change_event_cb_t data_callback;
 178   u32 pid;
 179 } pending_resolution_t;
 180
 181
 182 typedef struct
 183 {
 184   /* Hash tables mapping name to opcode. */
 185   uword *opcode_by_name;
 186
 187   /* lite beer "glean" adjacency handling */
 188   mhash_t pending_resolutions_by_address;
 189   pending_resolution_t *pending_resolutions;
 190
 191   /* Mac address change notification */
 192   mhash_t mac_changes_by_address;
 193   pending_resolution_t *mac_changes;
 194
 195   u32 *neighbor_input_next_index_by_hw_if_index;
 196
 197   ip6_neighbor_t *neighbor_pool;
 198
 199   mhash_t neighbor_index_by_key;
 200
 201   u32 *if_radv_pool_index_by_sw_if_index;
 202
 203   ip6_radv_t *if_radv_pool;
 204
 205   /* Neighbor attack mitigation */
 206   u32 limit_neighbor_cache_size;
 207   u32 neighbor_delete_rotor;
 208
 209   /* Wildcard nd report publisher */
 210   uword wc_ip6_nd_publisher_node;
 211   uword wc_ip6_nd_publisher_et;
 212
 213   /* Router advertisement report publisher */
 214   uword ip6_ra_publisher_node;
 215   uword ip6_ra_publisher_et;
 216 } ip6_neighbor_main_t;
 217
 218 /* ipv6 neighbor discovery - timer/event types */
 219 typedef enum
 220 {
 221   ICMP6_ND_EVENT_INIT,
 222 } ip6_icmp_neighbor_discovery_event_type_t;
 223
 224 typedef union
 225 {
 226   u32 add_del_swindex;
 227   struct
 228   {
 229     u32 up_down_swindex;
 230     u32 fib_index;
 231   } up_down_event;
 232 } ip6_icmp_neighbor_discovery_event_data_t;
 233
 234 static ip6_neighbor_main_t ip6_neighbor_main;
 235 ip6_neighbor_public_main_t ip6_neighbor_public_main;
 236 static ip6_address_t ip6a_zero; /* ip6 address 0 */
 237
 238 static void wc_nd_signal_report (wc_nd_report_t * r);
 239 static void ra_signal_report (ra_report_t * r);
 240
 241 ip6_address_t
 242 ip6_neighbor_get_link_local_address (u32 sw_if_index)
 243 {
 244   static ip6_address_t empty_address = { {0} };
 245   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 246   ip6_radv_t *radv_info;
 247   u32 ri = ~0;
 248
 249   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index)
 250     ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
 251   if (ri == ~0)
 252     {
 253       clib_warning ("IPv6 is not enabled for sw_if_index %d", sw_if_index);
 254       return empty_address;
 255     }
 256   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
 257   if (radv_info == NULL)
 258     {
 259       clib_warning ("Internal error");
 260       return empty_address;
 261     }
 262   return radv_info->link_local_address;
 263 }
 264
 265 /**
 266  * @brief publish wildcard arp event
 267  * @param sw_if_index The interface on which the ARP entries are acted
 268  */
 269 static int
 270 vnet_nd_wc_publish (u32 sw_if_index,
 271                     const mac_address_t * mac, const ip6_address_t * ip6)
 272 {
 273   wc_nd_report_t r = {
 274     .sw_if_index = sw_if_index,
 275     .ip6 = *ip6,
 276     .mac = *mac,
 277   };
 278
 279   vl_api_rpc_call_main_thread (wc_nd_signal_report, (u8 *) & r, sizeof r);
 280   return 0;
 281 }
 282
 283 static void
 284 wc_nd_signal_report (wc_nd_report_t * r)
 285 {
 286   vlib_main_t *vm = vlib_get_main ();
 287   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 288   uword ni = nm->wc_ip6_nd_publisher_node;
 289   uword et = nm->wc_ip6_nd_publisher_et;
 290
 291   if (ni == (uword) ~ 0)
 292     return;
 293   wc_nd_report_t *q =
 294     vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 295
 296   *q = *r;
 297 }
 298
 299 void
 300 wc_nd_set_publisher_node (uword node_index, uword event_type)
 301 {
 302   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 303   nm->wc_ip6_nd_publisher_node = node_index;
 304   nm->wc_ip6_nd_publisher_et = event_type;
 305 }
 306
 307 static int
 308 ra_publish (ra_report_t * r)
 309 {
 310   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 311   vl_api_rpc_call_main_thread (ra_signal_report, (u8 *) r, sizeof *r);
 312   return 0;
 313 }
 314
 315 static void
 316 ra_signal_report (ra_report_t * r)
 317 {
 318   vlib_main_t *vm = vlib_get_main ();
 319   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 320   uword ni = nm->ip6_ra_publisher_node;
 321   uword et = nm->ip6_ra_publisher_et;
 322
 323   if (ni == (uword) ~ 0)
 324     return;
 325   ra_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 326
 327   *q = *r;
 328 }
 329
 330 void
 331 ra_set_publisher_node (uword node_index, uword event_type)
 332 {
 333   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 334   nm->ip6_ra_publisher_node = node_index;
 335   nm->ip6_ra_publisher_et = event_type;
 336 }
 337
 338 static u8 *
 339 format_ip6_neighbor_ip6_entry (u8 * s, va_list * va)
 340 {
 341   vlib_main_t *vm = va_arg (*va, vlib_main_t *);
 342   ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *);
 343   vnet_main_t *vnm = vnet_get_main ();
 344   vnet_sw_interface_t *si;
 345
 346   if (!n)
 347     return format (s, "%=12s%=45s%=6s%=20s%=40s", "Time", "Address", "Flags",
 348                    "Link layer", "Interface");
 349
 350   si = vnet_get_sw_interface (vnm, n->key.sw_if_index);
 351
 352   return format (s, "%=12U%=45U%=6U%=20U%=40U",
 353                  format_vlib_time, vm, n->time_last_updated,
 354                  format_ip6_address, &n->key.ip6_address,
 355                  format_ip_neighbor_flags, n->flags,
 356                  format_mac_address_t, &n->mac,
 357                  format_vnet_sw_interface_name, vnm, si);
 358 }
 359
 360 static void
 361 ip6_neighbor_adj_fib_remove (ip6_neighbor_t * n, u32 fib_index)
 362 {
 363   if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 364     {
 365       if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 366         {
 367           ip6_ll_prefix_t pfx = {
 368             .ilp_addr = n->key.ip6_address,
 369             .ilp_sw_if_index = n->key.sw_if_index,
 370           };
 371           ip6_ll_table_entry_delete (&pfx);
 372         }
 373       else
 374         {
 375           fib_prefix_t pfx = {
 376             .fp_len = 128,
 377             .fp_proto = FIB_PROTOCOL_IP6,
 378             .fp_addr.ip6 = n->key.ip6_address,
 379           };
 380           fib_table_entry_path_remove (fib_index,
 381                                        &pfx,
 382                                        FIB_SOURCE_ADJ,
 383                                        DPO_PROTO_IP6,
 384                                        &pfx.fp_addr,
 385                                        n->key.sw_if_index, ~0,
 386                                        1, FIB_ROUTE_PATH_FLAG_NONE);
 387         }
 388     }
 389 }
 390
 391 typedef struct
 392 {
 393   u8 is_add;
 394   ip_neighbor_flags_t flags;
 395   mac_address_t mac;
 396   u32 sw_if_index;
 397   ip6_address_t addr;
 398 } ip6_neighbor_set_unset_rpc_args_t;
 399
 400 static void ip6_neighbor_set_unset_rpc_callback
 401   (ip6_neighbor_set_unset_rpc_args_t * a);
 402
 403 static void set_unset_ip6_neighbor_rpc
 404   (vlib_main_t * vm,
 405    u32 sw_if_index,
 406    const ip6_address_t * a,
 407    const mac_address_t * mac, int is_add, ip_neighbor_flags_t flags)
 408 {
 409   ip6_neighbor_set_unset_rpc_args_t args;
 410   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 411
 412   args.sw_if_index = sw_if_index;
 413   args.is_add = is_add;
 414   args.flags = flags;
 415   ip6_address_copy (&args.addr, a);
 416   mac_address_copy (&args.mac, mac);
 417
 418   vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback,
 419                                (u8 *) & args, sizeof (args));
 420 }
 421
 422 static void
 423 ip6_nbr_probe (ip_adjacency_t * adj)
 424 {
 425   icmp6_neighbor_solicitation_header_t *h;
 426   vnet_main_t *vnm = vnet_get_main ();
 427   ip6_main_t *im = &ip6_main;
 428   ip_interface_address_t *ia;
 429   ip6_address_t *dst, *src;
 430   vnet_hw_interface_t *hi;
 431   vnet_sw_interface_t *si;
 432   vlib_buffer_t *b;
 433   int bogus_length;
 434   vlib_main_t *vm;
 435   u32 bi = 0;
 436
 437   vm = vlib_get_main ();
 438
 439   si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
 440   dst = &adj->sub_type.nbr.next_hop.ip6;
 441
 442   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 443     {
 444       return;
 445     }
 446   src = ip6_interface_address_matching_destination (im, dst,
 447                                                     adj->rewrite_header.
 448                                                     sw_if_index, &ia);
 449   if (!src)
 450     {
 451       return;
 452     }
 453
 454   h = vlib_packet_template_get_packet (vm,
 455                                        &im->discover_neighbor_packet_template,
 456                                        &bi);
 457   if (!h)
 458     return;
 459
 460   hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
 461
 462   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
 463   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
 464   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
 465   h->ip.src_address = src[0];
 466   h->neighbor.target_address = dst[0];
 467
 468   clib_memcpy (h->link_layer_option.ethernet_address,
 469                hi->hw_address, vec_len (hi->hw_address));
 470
 471   h->neighbor.icmp.checksum =
 472     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
 473   ASSERT (bogus_length == 0);
 474
 475   b = vlib_get_buffer (vm, bi);
 476   vnet_buffer (b)->sw_if_index[VLIB_RX] =
 477     vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
 478
 479   /* Add encapsulation string for software interface (e.g. ethernet header). */
 480   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
 481   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
 482
 483   {
 484     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
 485     u32 *to_next = vlib_frame_vector_args (f);
 486     to_next[0] = bi;
 487     f->n_vectors = 1;
 488     vlib_put_frame_to_node (vm, hi->output_node_index, f);
 489   }
 490 }
 491
 492 static void
 493 ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr)
 494 {
 495   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 496                           ethernet_build_rewrite (vnet_get_main (),
 497                                                   nbr->key.sw_if_index,
 498                                                   adj_get_link_type (ai),
 499                                                   nbr->mac.bytes));
 500 }
 501
 502 static void
 503 ip6_nd_mk_incomplete (adj_index_t ai)
 504 {
 505   ip_adjacency_t *adj = adj_get (ai);
 506
 507   adj_nbr_update_rewrite (ai,
 508                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 509                           ethernet_build_rewrite (vnet_get_main (),
 510                                                   adj->rewrite_header.
 511                                                   sw_if_index,
 512                                                   adj_get_link_type (ai),
 513                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 514 }
 515
 516 #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \
 517 {                                            \
 518     k.sw_if_index = sw_if_index;             \
 519     k.ip6_address = *addr;                   \
 520     k.pad = 0;                               \
 521 }
 522
 523 static ip6_neighbor_t *
 524 ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr)
 525 {
 526   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 527   ip6_neighbor_t *n = NULL;
 528   ip6_neighbor_key_t k;
 529   uword *p;
 530
 531   IP6_NBR_MK_KEY (k, sw_if_index, addr);
 532
 533   p = mhash_get (&nm->neighbor_index_by_key, &k);
 534   if (p)
 535     {
 536       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 537     }
 538
 539   return (n);
 540 }
 541
 542 static adj_walk_rc_t
 543 ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx)
 544 {
 545   ip6_neighbor_t *nbr = ctx;
 546
 547   ip6_nd_mk_complete (ai, nbr);
 548
 549   return (ADJ_WALK_RC_CONTINUE);
 550 }
 551
 552 static adj_walk_rc_t
 553 ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx)
 554 {
 555   ip6_nd_mk_incomplete (ai);
 556
 557   return (ADJ_WALK_RC_CONTINUE);
 558 }
 559
 560 static clib_error_t *
 561 ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
 562                                    u32 sw_if_index, u32 flags)
 563 {
 564   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 565   ip6_neighbor_t *n;
 566   u32 i, *to_delete = 0;
 567
 568   /* *INDENT-OFF* */
 569   pool_foreach (n, nm->neighbor_pool,
 570   ({
 571     if (n->key.sw_if_index == sw_if_index)
 572       vec_add1 (to_delete, n - nm->neighbor_pool);
 573   }));
 574   /* *INDENT-ON* */
 575
 576   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
 577     {
 578       for (i = 0; i < vec_len (to_delete); i++)
 579         {
 580           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 581           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 582                             ip6_nd_mk_complete_walk, n);
 583         }
 584     }
 585   else
 586     {
 587       for (i = 0; i < vec_len (to_delete); i++)
 588         {
 589           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 590           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 591                             ip6_nd_mk_incomplete_walk, NULL);
 592           if (n->flags & IP_NEIGHBOR_FLAG_STATIC)
 593             continue;
 594           ip6_neighbor_adj_fib_remove (n,
 595                                        ip6_fib_table_get_index_for_sw_if_index
 596                                        (n->key.sw_if_index));
 597           mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 598           pool_put (nm->neighbor_pool, n);
 599         }
 600     }
 601
 602   vec_free (to_delete);
 603   return 0;
 604 }
 605
 606 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down);
 607
 608 void
 609 ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 610 {
 611   ip6_neighbor_t *nbr;
 612   ip_adjacency_t *adj;
 613
 614   adj = adj_get (ai);
 615
 616   nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6);
 617
 618   switch (adj->lookup_next_index)
 619     {
 620     case IP_LOOKUP_NEXT_GLEAN:
 621       adj_glean_update_rewrite (ai);
 622       break;
 623     case IP_LOOKUP_NEXT_ARP:
 624       if (NULL != nbr)
 625         {
 626           adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
 627                             ip6_nd_mk_complete_walk, nbr);
 628         }
 629       else
 630         {
 631           /*
 632            * no matching ND entry.
 633            * construct the rewrite required to for an ND packet, and stick
 634            * that in the adj's pipe to smoke.
 635            */
 636           adj_nbr_update_rewrite (ai,
 637                                   ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 638                                   ethernet_build_rewrite (vnm,
 639                                                           sw_if_index,
 640                                                           VNET_LINK_IP6,
 641                                                           VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 642
 643           /*
 644            * since the FIB has added this adj for a route, it makes sense it may
 645            * want to forward traffic sometime soon. Let's send a speculative ND.
 646            * just one. If we were to do periodically that wouldn't be bad either,
 647            * but that's more code than i'm prepared to write at this time for
 648            * relatively little reward.
 649            */
 650           ip6_nbr_probe (adj);
 651         }
 652       break;
 653     case IP_LOOKUP_NEXT_BCAST:
 654       adj_nbr_update_rewrite (ai,
 655                               ADJ_NBR_REWRITE_FLAG_COMPLETE,
 656                               ethernet_build_rewrite (vnm,
 657                                                       sw_if_index,
 658                                                       VNET_LINK_IP6,
 659                                                       VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 660       break;
 661     case IP_LOOKUP_NEXT_MCAST:
 662       {
 663         /*
 664          * Construct a partial rewrite from the known ethernet mcast dest MAC
 665          */
 666         u8 *rewrite;
 667         u8 offset;
 668
 669         rewrite = ethernet_build_rewrite (vnm,
 670                                           sw_if_index,
 671                                           adj->ia_link,
 672                                           ethernet_ip6_mcast_dst_addr ());
 673
 674         /*
 675          * Complete the remaining fields of the adj's rewrite to direct the
 676          * complete of the rewrite at switch time by copying in the IP
 677          * dst address's bytes.
 678          * Ofset is 2 bytes into the destintation address.
 679          */
 680         offset = vec_len (rewrite) - 2;
 681         adj_mcast_update_rewrite (ai, rewrite, offset);
 682
 683         break;
 684       }
 685     case IP_LOOKUP_NEXT_DROP:
 686     case IP_LOOKUP_NEXT_PUNT:
 687     case IP_LOOKUP_NEXT_LOCAL:
 688     case IP_LOOKUP_NEXT_REWRITE:
 689     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 690     case IP_LOOKUP_NEXT_MIDCHAIN:
 691     case IP_LOOKUP_NEXT_ICMP_ERROR:
 692     case IP_LOOKUP_N_NEXT:
 693       ASSERT (0);
 694       break;
 695     }
 696 }
 697
 698
 699 static void
 700 ip6_neighbor_adj_fib_add (ip6_neighbor_t * n, u32 fib_index)
 701 {
 702   if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 703     {
 704       ip6_ll_prefix_t pfx = {
 705         .ilp_addr = n->key.ip6_address,
 706         .ilp_sw_if_index = n->key.sw_if_index,
 707       };
 708       n->fib_entry_index =
 709         ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE);
 710     }
 711   else
 712     {
 713       fib_prefix_t pfx = {
 714         .fp_len = 128,
 715         .fp_proto = FIB_PROTOCOL_IP6,
 716         .fp_addr.ip6 = n->key.ip6_address,
 717       };
 718
 719       n->fib_entry_index =
 720         fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 721                                   FIB_ENTRY_FLAG_ATTACHED,
 722                                   DPO_PROTO_IP6, &pfx.fp_addr,
 723                                   n->key.sw_if_index, ~0, 1, NULL,
 724                                   FIB_ROUTE_PATH_FLAG_NONE);
 725     }
 726 }
 727
 728 static ip6_neighbor_t *
 729 force_reuse_neighbor_entry (void)
 730 {
 731   ip6_neighbor_t *n;
 732   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 733   u32 count = 0;
 734   u32 index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 735   if (index == ~0)              /* Try again from elt 0 */
 736     index = pool_next_index (nm->neighbor_pool, index);
 737
 738   /* Find a non-static random entry to free up for reuse */
 739   do
 740     {
 741       if ((count++ == 100) || (index == ~0))
 742         return NULL;            /* give up after 100 entries */
 743       n = pool_elt_at_index (nm->neighbor_pool, index);
 744       nm->neighbor_delete_rotor = index;
 745       index = pool_next_index (nm->neighbor_pool, index);
 746     }
 747   while (n->flags & IP_NEIGHBOR_FLAG_STATIC);
 748
 749   /* Remove ARP entry from its interface and update fib */
 750   adj_nbr_walk_nh6 (n->key.sw_if_index,
 751                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 752   ip6_neighbor_adj_fib_remove
 753     (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 754   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 755
 756   return n;
 757 }
 758
 759 int
 760 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 761                                 u32 sw_if_index,
 762                                 const ip6_address_t * a,
 763                                 const mac_address_t * mac,
 764                                 ip_neighbor_flags_t flags)
 765 {
 766   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 767   ip6_neighbor_key_t k;
 768   ip6_neighbor_t *n = 0;
 769   int make_new_nd_cache_entry = 1;
 770   uword *p;
 771   u32 next_index;
 772   pending_resolution_t *pr, *mc;
 773
 774   if (vlib_get_thread_index ())
 775     {
 776       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, mac, 1, flags);
 777       return 0;
 778     }
 779
 780   k.sw_if_index = sw_if_index;
 781   k.ip6_address = a[0];
 782   k.pad = 0;
 783
 784   p = mhash_get (&nm->neighbor_index_by_key, &k);
 785   if (p)
 786     {
 787       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 788       /* Refuse to over-write static neighbor entry. */
 789       if (!(flags & IP_NEIGHBOR_FLAG_STATIC) &&
 790           (n->flags & IP_NEIGHBOR_FLAG_STATIC))
 791         {
 792           /* if MAC address match, still check to send event */
 793           if (0 == mac_address_cmp (&n->mac, mac))
 794             goto check_customers;
 795           return -2;
 796         }
 797       make_new_nd_cache_entry = 0;
 798     }
 799
 800   if (make_new_nd_cache_entry)
 801     {
 802       if (nm->limit_neighbor_cache_size &&
 803           pool_elts (nm->neighbor_pool) >= nm->limit_neighbor_cache_size)
 804         {
 805           n = force_reuse_neighbor_entry ();
 806           if (NULL == n)
 807             return -2;
 808         }
 809       else
 810         pool_get (nm->neighbor_pool, n);
 811
 812       mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
 813                  /* old value */ 0);
 814       n->key = k;
 815       n->fib_entry_index = FIB_NODE_INDEX_INVALID;
 816
 817       mac_address_copy (&n->mac, mac);
 818
 819       /*
 820        * create the adj-fib. the entry in the FIB table for and to the peer.
 821        */
 822       if (!(flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY))
 823         {
 824           ip6_neighbor_adj_fib_add
 825             (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 826         }
 827       else
 828         {
 829           n->flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 830         }
 831     }
 832   else
 833     {
 834       /*
 835        * prevent a DoS attack from the data-plane that
 836        * spams us with no-op updates to the MAC address
 837        */
 838       if (0 == mac_address_cmp (&n->mac, mac))
 839         {
 840           n->time_last_updated = vlib_time_now (vm);
 841           goto check_customers;
 842         }
 843
 844       mac_address_copy (&n->mac, mac);
 845     }
 846
 847   /* Update time stamp and flags. */
 848   n->time_last_updated = vlib_time_now (vm);
 849   if (flags & IP_NEIGHBOR_FLAG_STATIC)
 850     {
 851       n->flags |= IP_NEIGHBOR_FLAG_STATIC;
 852       n->flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
 853     }
 854   else
 855     {
 856       n->flags |= IP_NEIGHBOR_FLAG_DYNAMIC;
 857       n->flags &= ~IP_NEIGHBOR_FLAG_STATIC;
 858     }
 859
 860   adj_nbr_walk_nh6 (sw_if_index,
 861                     &n->key.ip6_address, ip6_nd_mk_complete_walk, n);
 862
 863 check_customers:
 864   /* Customer(s) waiting for this address to be resolved? */
 865   p = mhash_get (&nm->pending_resolutions_by_address, a);
 866   if (p)
 867     {
 868       next_index = p[0];
 869
 870       while (next_index != (u32) ~ 0)
 871         {
 872           pr = pool_elt_at_index (nm->pending_resolutions, next_index);
 873           vlib_process_signal_event (vm, pr->node_index,
 874                                      pr->type_opaque, pr->data);
 875           next_index = pr->next_index;
 876           pool_put (nm->pending_resolutions, pr);
 877         }
 878
 879       mhash_unset (&nm->pending_resolutions_by_address, (void *) a, 0);
 880     }
 881
 882   /* Customer(s) requesting ND event for this address? */
 883   p = mhash_get (&nm->mac_changes_by_address, a);
 884   if (p)
 885     {
 886       next_index = p[0];
 887
 888       while (next_index != (u32) ~ 0)
 889         {
 890           int rv = 1;
 891
 892           mc = pool_elt_at_index (nm->mac_changes, next_index);
 893
 894           /* Call the user's data callback, return 1 to suppress dup events */
 895           if (mc->data_callback)
 896             rv = (mc->data_callback) (mc->data, mac, sw_if_index, &ip6a_zero);
 897           /*
 898            * Signal the resolver process, as long as the user
 899            * says they want to be notified
 900            */
 901           if (rv == 0)
 902             vlib_process_signal_event (vm, mc->node_index,
 903                                        mc->type_opaque, mc->data);
 904           next_index = mc->next_index;
 905         }
 906     }
 907
 908   return 0;
 909 }
 910
 911 int
 912 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 913                                   u32 sw_if_index, const ip6_address_t * a)
 914 {
 915   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 916   ip6_neighbor_key_t k;
 917   ip6_neighbor_t *n;
 918   uword *p;
 919   int rv = 0;
 920
 921   if (vlib_get_thread_index ())
 922     {
 923       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, NULL, 0,
 924                                   IP_NEIGHBOR_FLAG_NONE);
 925       return 0;
 926     }
 927
 928   k.sw_if_index = sw_if_index;
 929   k.ip6_address = a[0];
 930   k.pad = 0;
 931
 932   p = mhash_get (&nm->neighbor_index_by_key, &k);
 933   if (p == 0)
 934     {
 935       rv = -1;
 936       goto out;
 937     }
 938
 939   n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 940
 941   adj_nbr_walk_nh6 (sw_if_index,
 942                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 943   ip6_neighbor_adj_fib_remove
 944     (n, ip6_fib_table_get_index_for_sw_if_index (sw_if_index));
 945
 946   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 947   pool_put (nm->neighbor_pool, n);
 948
 949 out:
 950   return rv;
 951 }
 952
 953 static void ip6_neighbor_set_unset_rpc_callback
 954   (ip6_neighbor_set_unset_rpc_args_t * a)
 955 {
 956   vlib_main_t *vm = vlib_get_main ();
 957   if (a->is_add)
 958     vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 959                                     &a->mac, a->flags);
 960   else
 961     vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr);
 962 }
 963
 964 static int
 965 ip6_neighbor_sort (void *a1, void *a2)
 966 {
 967   vnet_main_t *vnm = vnet_get_main ();
 968   ip6_neighbor_t *n1 = a1, *n2 = a2;
 969   int cmp;
 970   cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index,
 971                                    n2->key.sw_if_index);
 972   if (!cmp)
 973     cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address);
 974   return cmp;
 975 }
 976
 977 ip6_neighbor_t *
 978 ip6_neighbors_pool (void)
 979 {
 980   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 981   return nm->neighbor_pool;
 982 }
 983
 984 ip6_neighbor_t *
 985 ip6_neighbors_entries (u32 sw_if_index)
 986 {
 987   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 988   ip6_neighbor_t *n, *ns = NULL;
 989
 990   /* *INDENT-OFF* */
 991   pool_foreach (n, nm->neighbor_pool,
 992   ({
 993     if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index)
 994       continue;
 995     vec_add1 (ns, n[0]);
 996   }));
 997   /* *INDENT-ON* */
 998
 999   if (ns)
1000     vec_sort_with_function (ns, ip6_neighbor_sort);
1001   return ns;
1002 }
1003
1004 static clib_error_t *
1005 show_ip6_neighbors (vlib_main_t * vm,
1006                     unformat_input_t * input, vlib_cli_command_t * cmd)
1007 {
1008   vnet_main_t *vnm = vnet_get_main ();
1009   ip6_neighbor_t *n, *ns;
1010   clib_error_t *error = 0;
1011   u32 sw_if_index;
1012   int verbose = 0;
1013
1014   if (unformat (input, "verbose"))
1015     verbose = 1;
1016
1017   /* Filter entries by interface if given. */
1018   sw_if_index = ~0;
1019   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1020
1021   ns = ip6_neighbors_entries (sw_if_index);
1022   if (ns)
1023     {
1024       /*
1025        * Show the entire table if it's not too big, otherwise just
1026        * show the size of the table.
1027        */
1028       if (vec_len (ns) < 50)
1029         verbose = 1;
1030       if (verbose)
1031         {
1032           vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0);
1033           vec_foreach (n, ns)
1034           {
1035             vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n);
1036           }
1037         }
1038       else
1039         vlib_cli_output
1040           (vm, "There are %u ip6 neighbors, "
1041            "'show ip6 neighbors verbose' to display the entire table...",
1042            vec_len (ns));
1043       vec_free (ns);
1044     }
1045   else
1046     vlib_cli_output (vm, "No ip6 neighbors");
1047
1048   return error;
1049 }
1050
1051 /*?
1052  * This command is used to display the adjacent IPv6 hosts found via
1053  * neighbor discovery. Optionally, limit the output to the specified
1054  * interface.
1055  *
1056  * @cliexpar
1057  * Example of how to display the IPv6 neighbor adjacency table:
1058  * @cliexstart{show ip6 neighbors}
1059  *     Time           Address       Flags     Link layer                     Interface
1060  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
1061  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
1062  *     886.6654     ::1:1:c:0:9       S    02:fe:e4:45:27:5b                GigabitEthernet3/0/0
1063  * @cliexend
1064  * Example of how to display the IPv6 neighbor adjacency table for given interface:
1065  * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0}
1066  *     Time           Address       Flags     Link layer                     Interface
1067  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
1068  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
1069  * @cliexend
1070 ?*/
1071 /* *INDENT-OFF* */
1072 VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = {
1073   .path = "show ip6 neighbors",
1074   .function = show_ip6_neighbors,
1075   .short_help = "show ip6 neighbors [<interface>]",
1076 };
1077 /* *INDENT-ON* */
1078
1079 static clib_error_t *
1080 set_ip6_neighbor (vlib_main_t * vm,
1081                   unformat_input_t * input, vlib_cli_command_t * cmd)
1082 {
1083   ip_neighbor_flags_t flags = IP_NEIGHBOR_FLAG_NONE;
1084   vnet_main_t *vnm = vnet_get_main ();
1085   ip6_address_t addr;
1086   mac_address_t mac;
1087   int addr_valid = 0;
1088   int is_del = 0;
1089   u32 sw_if_index;
1090
1091   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1092     {
1093       /* intfc, ip6-address, mac-address */
1094       if (unformat (input, "%U %U %U",
1095                     unformat_vnet_sw_interface, vnm, &sw_if_index,
1096                     unformat_ip6_address, &addr,
1097                     unformat_mac_address_t, &mac))
1098         addr_valid = 1;
1099
1100       else if (unformat (input, "delete") || unformat (input, "del"))
1101         is_del = 1;
1102       else if (unformat (input, "static"))
1103         flags |= IP_NEIGHBOR_FLAG_STATIC;
1104       else if (unformat (input, "no-fib-entry"))
1105         flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
1106       else
1107         break;
1108     }
1109
1110   if (!addr_valid)
1111     return clib_error_return (0, "Missing interface, ip6 or hw address");
1112
1113   if (!is_del)
1114     vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr, &mac, flags);
1115   else
1116     vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr);
1117   return 0;
1118 }
1119
1120 /*?
1121  * This command is used to manually add an entry to the IPv6 neighbor
1122  * adjacency table. Optionally, the entry can be added as static. It is
1123  * also used to remove an entry from the table. Use the '<em>show ip6
1124  * neighbors</em>' command to display all learned and manually entered entries.
1125  *
1126  * @cliexpar
1127  * Example of how to add a static entry to the IPv6 neighbor adjacency table:
1128  * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static}
1129  * Example of how to delete an entry from the IPv6 neighbor adjacency table:
1130  * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b}
1131 ?*/
1132 /* *INDENT-OFF* */
1133 VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) =
1134 {
1135   .path = "set ip6 neighbor",
1136   .function = set_ip6_neighbor,
1137   .short_help = "set ip6 neighbor [del] <interface> <ip6-address> <mac-address> [static]",
1138 };
1139 /* *INDENT-ON* */
1140
1141 typedef enum
1142 {
1143   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
1144   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
1145   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
1146 } icmp6_neighbor_solicitation_or_advertisement_next_t;
1147
1148 static_always_inline uword
1149 icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm,
1150                                               vlib_node_runtime_t * node,
1151                                               vlib_frame_t * frame,
1152                                               uword is_solicitation)
1153 {
1154   vnet_main_t *vnm = vnet_get_main ();
1155   ip6_main_t *im = &ip6_main;
1156   uword n_packets = frame->n_vectors;
1157   u32 *from, *to_next;
1158   u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent;
1159   icmp6_neighbor_discovery_option_type_t option_type;
1160   vlib_node_runtime_t *error_node =
1161     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1162   int bogus_length;
1163
1164   from = vlib_frame_vector_args (frame);
1165   n_left_from = n_packets;
1166   next_index = node->cached_next_index;
1167
1168   if (node->flags & VLIB_NODE_FLAG_TRACE)
1169     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1170                                    /* stride */ 1,
1171                                    sizeof (icmp6_input_trace_t));
1172
1173   option_type =
1174     (is_solicitation
1175      ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address
1176      : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address);
1177   n_advertisements_sent = 0;
1178
1179   while (n_left_from > 0)
1180     {
1181       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1182
1183       while (n_left_from > 0 && n_left_to_next > 0)
1184         {
1185           vlib_buffer_t *p0;
1186           ip6_header_t *ip0;
1187           icmp6_neighbor_solicitation_or_advertisement_header_t *h0;
1188           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1189           u32 bi0, options_len0, sw_if_index0, next0, error0;
1190           u32 ip6_sadd_link_local, ip6_sadd_unspecified;
1191           int is_rewrite0;
1192           u32 ni0;
1193
1194           bi0 = to_next[0] = from[0];
1195
1196           from += 1;
1197           to_next += 1;
1198           n_left_from -= 1;
1199           n_left_to_next -= 1;
1200
1201           p0 = vlib_get_buffer (vm, bi0);
1202           ip0 = vlib_buffer_get_current (p0);
1203           h0 = ip6_next_header (ip0);
1204           options_len0 =
1205             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1206
1207           error0 = ICMP6_ERROR_NONE;
1208           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1209           ip6_sadd_link_local =
1210             ip6_address_is_link_local_unicast (&ip0->src_address);
1211           ip6_sadd_unspecified =
1212             ip6_address_is_unspecified (&ip0->src_address);
1213
1214           /* Check that source address is unspecified, link-local or else on-link. */
1215           if (!ip6_sadd_unspecified && !ip6_sadd_link_local)
1216             {
1217               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1218
1219               if (ADJ_INDEX_INVALID != src_adj_index0)
1220                 {
1221                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1222
1223                   /* Allow all realistic-looking rewrite adjacencies to pass */
1224                   ni0 = adj0->lookup_next_index;
1225                   is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) &&
1226                     (ni0 < IP6_LOOKUP_N_NEXT);
1227
1228                   error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0
1229                              || !is_rewrite0)
1230                             ?
1231                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK
1232                             : error0);
1233                 }
1234               else
1235                 {
1236                   error0 =
1237                     ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK;
1238                 }
1239             }
1240
1241           o0 = (void *) (h0 + 1);
1242           o0 = ((options_len0 == 8 && o0->header.type == option_type
1243                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1244
1245           /* If src address unspecified or link local, donot learn neighbor MAC */
1246           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1247                             !ip6_sadd_unspecified))
1248             {
1249               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1250                                               is_solicitation ?
1251                                               &ip0->src_address :
1252                                               &h0->target_address,
1253                                               (mac_address_t *)
1254                                               o0->ethernet_address,
1255                                               IP_NEIGHBOR_FLAG_NONE);
1256             }
1257
1258           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1259             {
1260               /* Check that target address is local to this router. */
1261               fib_node_index_t fei;
1262               u32 fib_index;
1263
1264               fib_index =
1265                 ip6_fib_table_get_index_for_sw_if_index (sw_if_index0);
1266
1267               if (~0 == fib_index)
1268                 {
1269                   error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1270                 }
1271               else
1272                 {
1273                   if (ip6_address_is_link_local_unicast (&h0->target_address))
1274                     {
1275                       fei = ip6_fib_table_lookup_exact_match
1276                         (ip6_ll_fib_get (sw_if_index0),
1277                          &h0->target_address, 128);
1278                     }
1279                   else
1280                     {
1281                       fei = ip6_fib_table_lookup_exact_match (fib_index,
1282                                                               &h0->target_address,
1283                                                               128);
1284                     }
1285
1286                   if (FIB_NODE_INDEX_INVALID == fei)
1287                     {
1288                       /* The target address is not in the FIB */
1289                       error0 =
1290                         ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1291                     }
1292                   else
1293                     {
1294                       if (FIB_ENTRY_FLAG_LOCAL &
1295                           fib_entry_get_flags_for_source (fei,
1296                                                           FIB_SOURCE_INTERFACE))
1297                         {
1298                           /* It's an address that belongs to one of our interfaces
1299                            * that's good. */
1300                         }
1301                       else
1302                         if (fib_entry_is_sourced
1303                             (fei, FIB_SOURCE_IP6_ND_PROXY) ||
1304                             fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND))
1305                         {
1306                           /* The address was added by IPv6 Proxy ND config.
1307                            * We should only respond to these if the NS arrived on
1308                            * the link that has a matching covering prefix */
1309                         }
1310                       else
1311                         {
1312                           error0 =
1313                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1314                         }
1315                     }
1316                 }
1317             }
1318
1319           if (is_solicitation)
1320             next0 = (error0 != ICMP6_ERROR_NONE
1321                      ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP
1322                      : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY);
1323           else
1324             {
1325               next0 = 0;
1326               error0 = error0 == ICMP6_ERROR_NONE ?
1327                 ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0;
1328             }
1329
1330           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1331             {
1332               vnet_sw_interface_t *sw_if0;
1333               ethernet_interface_t *eth_if0;
1334               ethernet_header_t *eth0;
1335
1336               /* dst address is either source address or the all-nodes mcast addr */
1337               if (!ip6_sadd_unspecified)
1338                 ip0->dst_address = ip0->src_address;
1339               else
1340                 ip6_set_reserved_multicast_address (&ip0->dst_address,
1341                                                     IP6_MULTICAST_SCOPE_link_local,
1342                                                     IP6_MULTICAST_GROUP_ID_all_hosts);
1343
1344               ip0->src_address = h0->target_address;
1345               ip0->hop_limit = 255;
1346               h0->icmp.type = ICMP6_neighbor_advertisement;
1347
1348               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1349               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1350               eth_if0 =
1351                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1352               if (eth_if0 && o0)
1353                 {
1354                   clib_memcpy (o0->ethernet_address, eth_if0->address, 6);
1355                   o0->header.type =
1356                     ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
1357                 }
1358
1359               h0->advertisement_flags = clib_host_to_net_u32
1360                 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
1361                  | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
1362
1363               h0->icmp.checksum = 0;
1364               h0->icmp.checksum =
1365                 ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1366                                                    &bogus_length);
1367               ASSERT (bogus_length == 0);
1368
1369               /* Reuse current MAC header, copy SMAC to DMAC and
1370                * interface MAC to SMAC */
1371               vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0));
1372               eth0 = vlib_buffer_get_current (p0);
1373               clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1374               if (eth_if0)
1375                 clib_memcpy (eth0->src_address, eth_if0->address, 6);
1376
1377               /* Setup input and output sw_if_index for packet */
1378               ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0);
1379               vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1380               vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1381                 vnet_main.local_interface_sw_if_index;
1382
1383               n_advertisements_sent++;
1384             }
1385
1386           p0->error = error_node->errors[error0];
1387
1388           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1389                                            to_next, n_left_to_next,
1390                                            bi0, next0);
1391         }
1392
1393       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1394     }
1395
1396   /* Account for advertisements sent. */
1397   vlib_error_count (vm, error_node->node_index,
1398                     ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX,
1399                     n_advertisements_sent);
1400
1401   return frame->n_vectors;
1402 }
1403
1404 /* for "syslogging" - use elog for now */
1405 #define foreach_log_level            \
1406   _ (DEBUG, "DEBUG")                         \
1407   _ (INFO, "INFORMATION")            \
1408   _ (NOTICE, "NOTICE")               \
1409   _ (WARNING, "WARNING")             \
1410   _ (ERR, "ERROR")                                    \
1411   _ (CRIT, "CRITICAL")                        \
1412   _ (ALERT, "ALERT")                          \
1413   _ (EMERG,  "EMERGENCY")
1414
1415 typedef enum
1416 {
1417 #define _(f,s) LOG_##f,
1418   foreach_log_level
1419 #undef _
1420 } log_level_t;
1421
1422 static char *log_level_strings[] = {
1423 #define _(f,s) s,
1424   foreach_log_level
1425 #undef _
1426 };
1427
1428 static int logmask = 1 << LOG_DEBUG;
1429
1430 static void
1431 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
1432 {
1433   /* just use elog for now */
1434   u8 *what;
1435   va_list va;
1436
1437   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
1438     return;
1439
1440   va_start (va, fmt);
1441   if (fmt)
1442     {
1443       what = va_format (0, fmt, &va);
1444
1445       ELOG_TYPE_DECLARE (e) =
1446       {
1447       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
1448       struct
1449       {
1450         u32 s[2];
1451       } *ed;
1452       ed = ELOG_DATA (&vm->elog_main, e);
1453       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
1454       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
1455     }
1456   va_end (va);
1457   return;
1458 }
1459
1460 clib_error_t *
1461 call_ip6_neighbor_callbacks (void *data,
1462                              _vnet_ip6_neighbor_function_list_elt_t * elt)
1463 {
1464   clib_error_t *error = 0;
1465
1466   while (elt)
1467     {
1468       error = elt->fp (data);
1469       if (error)
1470         return error;
1471       elt = elt->next_ip6_neighbor_function;
1472     }
1473
1474   return error;
1475 }
1476
1477 /* ipv6 neighbor discovery - router advertisements */
1478 typedef enum
1479 {
1480   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
1481   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
1482   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
1483   ICMP6_ROUTER_SOLICITATION_N_NEXT,
1484 } icmp6_router_solicitation_or_advertisement_next_t;
1485
1486 static_always_inline uword
1487 icmp6_router_solicitation (vlib_main_t * vm,
1488                            vlib_node_runtime_t * node, vlib_frame_t * frame)
1489 {
1490   vnet_main_t *vnm = vnet_get_main ();
1491   ip6_main_t *im = &ip6_main;
1492   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1493   uword n_packets = frame->n_vectors;
1494   u32 *from, *to_next;
1495   u32 n_left_from, n_left_to_next, next_index;
1496   u32 n_advertisements_sent = 0;
1497   int bogus_length;
1498
1499   icmp6_neighbor_discovery_option_type_t option_type;
1500
1501   vlib_node_runtime_t *error_node =
1502     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1503
1504   from = vlib_frame_vector_args (frame);
1505   n_left_from = n_packets;
1506   next_index = node->cached_next_index;
1507
1508   if (node->flags & VLIB_NODE_FLAG_TRACE)
1509     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1510                                    /* stride */ 1,
1511                                    sizeof (icmp6_input_trace_t));
1512
1513   /* source may append his LL address */
1514   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1515
1516   while (n_left_from > 0)
1517     {
1518       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1519
1520       while (n_left_from > 0 && n_left_to_next > 0)
1521         {
1522           vlib_buffer_t *p0;
1523           ip6_header_t *ip0;
1524           ip6_radv_t *radv_info = 0;
1525
1526           icmp6_neighbor_discovery_header_t *h0;
1527           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1528
1529           u32 bi0, options_len0, sw_if_index0, next0, error0;
1530           u32 is_solicitation = 1, is_dropped = 0;
1531           u32 is_unspecified, is_link_local;
1532
1533           bi0 = to_next[0] = from[0];
1534
1535           from += 1;
1536           to_next += 1;
1537           n_left_from -= 1;
1538           n_left_to_next -= 1;
1539
1540           p0 = vlib_get_buffer (vm, bi0);
1541           ip0 = vlib_buffer_get_current (p0);
1542           h0 = ip6_next_header (ip0);
1543           options_len0 =
1544             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1545           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
1546           is_link_local =
1547             ip6_address_is_link_local_unicast (&ip0->src_address);
1548
1549           error0 = ICMP6_ERROR_NONE;
1550           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1551
1552           /* check if solicitation  (not from nd_timer node) */
1553           if (ip6_address_is_unspecified (&ip0->dst_address))
1554             is_solicitation = 0;
1555
1556           /* Check that source address is unspecified, link-local or else on-link. */
1557           if (!is_unspecified && !is_link_local)
1558             {
1559               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1560
1561               if (ADJ_INDEX_INVALID != src_adj_index0)
1562                 {
1563                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1564
1565                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
1566                             ?
1567                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
1568                             : error0);
1569                 }
1570               else
1571                 {
1572                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
1573                 }
1574             }
1575
1576           /* check for source LL option and process */
1577           o0 = (void *) (h0 + 1);
1578           o0 = ((options_len0 == 8
1579                  && o0->header.type == option_type
1580                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1581
1582           /* if src address unspecified IGNORE any options */
1583           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1584                             !is_unspecified && !is_link_local))
1585             {
1586               vnet_set_ip6_ethernet_neighbor
1587                 (vm, sw_if_index0,
1588                  &ip0->src_address,
1589                  (mac_address_t *) o0->ethernet_address,
1590                  IP_NEIGHBOR_FLAG_NONE);
1591             }
1592
1593           /* default is to drop */
1594           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1595
1596           if (error0 == ICMP6_ERROR_NONE)
1597             {
1598               vnet_sw_interface_t *sw_if0;
1599               ethernet_interface_t *eth_if0;
1600               u32 adj_index0;
1601
1602               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1603               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1604               eth_if0 =
1605                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1606
1607               /* only support ethernet interface type for now */
1608               error0 =
1609                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1610                 : error0;
1611
1612               if (error0 == ICMP6_ERROR_NONE)
1613                 {
1614                   u32 ri;
1615
1616                   /* adjust the sizeof the buffer to just include the ipv6 header */
1617                   p0->current_length -=
1618                     (options_len0 +
1619                      sizeof (icmp6_neighbor_discovery_header_t));
1620
1621                   /* look up the radv_t information for this interface */
1622                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1623                       sw_if_index0)
1624                     {
1625                       ri =
1626                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1627
1628                       if (ri != ~0)
1629                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1630                     }
1631
1632                   error0 =
1633                     ((!radv_info) ?
1634                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1635                      error0);
1636
1637                   if (error0 == ICMP6_ERROR_NONE)
1638                     {
1639                       f64 now = vlib_time_now (vm);
1640
1641                       /* for solicited adverts - need to rate limit */
1642                       if (is_solicitation)
1643                         {
1644                           if (0 != radv_info->last_radv_time &&
1645                               (now - radv_info->last_radv_time) <
1646                               MIN_DELAY_BETWEEN_RAS)
1647                             is_dropped = 1;
1648                           else
1649                             radv_info->last_radv_time = now;
1650                         }
1651
1652                       /* send now  */
1653                       icmp6_router_advertisement_header_t rh;
1654
1655                       rh.icmp.type = ICMP6_router_advertisement;
1656                       rh.icmp.code = 0;
1657                       rh.icmp.checksum = 0;
1658
1659                       rh.current_hop_limit = radv_info->curr_hop_limit;
1660                       rh.router_lifetime_in_sec =
1661                         clib_host_to_net_u16
1662                         (radv_info->adv_router_lifetime_in_sec);
1663                       rh.
1664                         time_in_msec_between_retransmitted_neighbor_solicitations
1665                         =
1666                         clib_host_to_net_u32 (radv_info->
1667                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
1668                       rh.neighbor_reachable_time_in_msec =
1669                         clib_host_to_net_u32 (radv_info->
1670                                               adv_neighbor_reachable_time_in_msec);
1671
1672                       rh.flags =
1673                         (radv_info->adv_managed_flag) ?
1674                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
1675                         0;
1676                       rh.flags |=
1677                         ((radv_info->adv_other_flag) ?
1678                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
1679                          0);
1680
1681
1682                       u16 payload_length =
1683                         sizeof (icmp6_router_advertisement_header_t);
1684
1685                       if (vlib_buffer_add_data
1686                           (vm, &bi0, (void *) &rh,
1687                            sizeof (icmp6_router_advertisement_header_t)))
1688                         {
1689                           /* buffer allocation failed, drop the pkt */
1690                           error0 = ICMP6_ERROR_ALLOC_FAILURE;
1691                           goto drop0;
1692                         }
1693
1694                       if (radv_info->adv_link_layer_address)
1695                         {
1696                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1697                             h;
1698
1699                           h.header.type =
1700                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1701                           h.header.n_data_u64s = 1;
1702
1703                           /* copy ll address */
1704                           clib_memcpy (&h.ethernet_address[0],
1705                                        eth_if0->address, 6);
1706
1707                           if (vlib_buffer_add_data
1708                               (vm, &bi0, (void *) &h,
1709                                sizeof
1710                                (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
1711                             {
1712                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1713                               goto drop0;
1714                             }
1715
1716                           payload_length +=
1717                             sizeof
1718                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1719                         }
1720
1721                       /* add MTU option */
1722                       if (radv_info->adv_link_mtu)
1723                         {
1724                           icmp6_neighbor_discovery_mtu_option_t h;
1725
1726                           h.unused = 0;
1727                           h.mtu =
1728                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1729                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1730                           h.header.n_data_u64s = 1;
1731
1732                           payload_length +=
1733                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1734
1735                           if (vlib_buffer_add_data
1736                               (vm, &bi0, (void *) &h,
1737                                sizeof
1738                                (icmp6_neighbor_discovery_mtu_option_t)))
1739                             {
1740                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1741                               goto drop0;
1742                             }
1743                         }
1744
1745                       /* add advertised prefix options  */
1746                       ip6_radv_prefix_t *pr_info;
1747
1748                       /* *INDENT-OFF* */
1749                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1750                       ({
1751                         if(pr_info->enabled &&
1752                            (!pr_info->decrement_lifetime_flag
1753                             || (pr_info->pref_lifetime_expires >0)))
1754                           {
1755                             /* advertise this prefix */
1756                             icmp6_neighbor_discovery_prefix_information_option_t h;
1757
1758                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1759                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1760
1761                             h.dst_address_length  = pr_info->prefix_len;
1762
1763                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1764                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1765
1766                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1767                               {
1768                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1769                                 h.preferred_time  = 0;
1770                               }
1771                             else
1772                               {
1773                                 if(pr_info->decrement_lifetime_flag)
1774                                   {
1775                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1776                                       (pr_info->valid_lifetime_expires  - now) : 0;
1777
1778                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1779                                       (pr_info->pref_lifetime_expires  - now) : 0;
1780                                   }
1781
1782                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1783                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1784                               }
1785                             h.unused  = 0;
1786
1787                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1788
1789                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1790
1791                             if (vlib_buffer_add_data
1792                                 (vm, &bi0, (void *)&h,
1793                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
1794                               {
1795                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
1796                                 goto drop0;
1797                               }
1798
1799                           }
1800                       }));
1801                       /* *INDENT-ON* */
1802
1803                       /* add additional options before here */
1804
1805                       /* finish building the router advertisement... */
1806                       if (!is_unspecified && radv_info->send_unicast)
1807                         {
1808                           ip0->dst_address = ip0->src_address;
1809                         }
1810                       else
1811                         {
1812                           /* target address is all-nodes mcast addr */
1813                           ip6_set_reserved_multicast_address
1814                             (&ip0->dst_address,
1815                              IP6_MULTICAST_SCOPE_link_local,
1816                              IP6_MULTICAST_GROUP_ID_all_hosts);
1817                         }
1818
1819                       /* source address MUST be the link-local address */
1820                       ip0->src_address = radv_info->link_local_address;
1821
1822                       ip0->hop_limit = 255;
1823                       ip0->payload_length =
1824                         clib_host_to_net_u16 (payload_length);
1825
1826                       icmp6_router_advertisement_header_t *rh0 =
1827                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1828                       rh0->icmp.checksum =
1829                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1830                                                            &bogus_length);
1831                       ASSERT (bogus_length == 0);
1832
1833                       /* setup output if and adjacency */
1834                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1835                         vnet_main.local_interface_sw_if_index;
1836
1837                       if (is_solicitation)
1838                         {
1839                           ethernet_header_t *eth0;
1840                           /* Reuse current MAC header, copy SMAC to DMAC and
1841                            * interface MAC to SMAC */
1842                           vlib_buffer_reset (p0);
1843                           eth0 = vlib_buffer_get_current (p0);
1844                           clib_memcpy (eth0->dst_address, eth0->src_address,
1845                                        6);
1846                           clib_memcpy (eth0->src_address, eth_if0->address,
1847                                        6);
1848                           next0 =
1849                             is_dropped ? next0 :
1850                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1851                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1852                             sw_if_index0;
1853                         }
1854                       else
1855                         {
1856                           adj_index0 = radv_info->mcast_adj_index;
1857                           if (adj_index0 == 0)
1858                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1859                           else
1860                             {
1861                               next0 =
1862                                 is_dropped ? next0 :
1863                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1864                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1865                                 adj_index0;
1866                             }
1867                         }
1868                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1869
1870                       radv_info->n_solicitations_dropped += is_dropped;
1871                       radv_info->n_solicitations_rcvd += is_solicitation;
1872
1873                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1874                         {
1875                           radv_info->n_advertisements_sent++;
1876                           n_advertisements_sent++;
1877                         }
1878                     }
1879                 }
1880             }
1881
1882         drop0:
1883           p0->error = error_node->errors[error0];
1884
1885           if (error0 != ICMP6_ERROR_NONE)
1886             vlib_error_count (vm, error_node->node_index, error0, 1);
1887
1888           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1889                                            to_next, n_left_to_next,
1890                                            bi0, next0);
1891
1892         }
1893
1894       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1895     }
1896
1897   /* Account for router advertisements sent. */
1898   vlib_error_count (vm, error_node->node_index,
1899                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1900                     n_advertisements_sent);
1901
1902   return frame->n_vectors;
1903 }
1904
1905  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1906 static_always_inline uword
1907 icmp6_router_advertisement (vlib_main_t * vm,
1908                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1909 {
1910   vnet_main_t *vnm = vnet_get_main ();
1911   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1912   uword n_packets = frame->n_vectors;
1913   u32 *from, *to_next;
1914   u32 n_left_from, n_left_to_next, next_index;
1915   u32 n_advertisements_rcvd = 0;
1916
1917   vlib_node_runtime_t *error_node =
1918     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1919
1920   from = vlib_frame_vector_args (frame);
1921   n_left_from = n_packets;
1922   next_index = node->cached_next_index;
1923
1924   if (node->flags & VLIB_NODE_FLAG_TRACE)
1925     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1926                                    /* stride */ 1,
1927                                    sizeof (icmp6_input_trace_t));
1928
1929   while (n_left_from > 0)
1930     {
1931       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1932
1933       while (n_left_from > 0 && n_left_to_next > 0)
1934         {
1935           vlib_buffer_t *p0;
1936           ip6_header_t *ip0;
1937           ip6_radv_t *radv_info = 0;
1938           icmp6_router_advertisement_header_t *h0;
1939           u32 bi0, options_len0, sw_if_index0, next0, error0;
1940
1941           bi0 = to_next[0] = from[0];
1942
1943           from += 1;
1944           to_next += 1;
1945           n_left_from -= 1;
1946           n_left_to_next -= 1;
1947
1948           p0 = vlib_get_buffer (vm, bi0);
1949           ip0 = vlib_buffer_get_current (p0);
1950           h0 = ip6_next_header (ip0);
1951           options_len0 =
1952             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1953
1954           error0 = ICMP6_ERROR_NONE;
1955           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1956
1957           /* Check that source address is link-local */
1958           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1959             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1960
1961           /* default is to drop */
1962           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1963
1964           n_advertisements_rcvd++;
1965
1966           if (error0 == ICMP6_ERROR_NONE)
1967             {
1968               vnet_sw_interface_t *sw_if0;
1969               ethernet_interface_t *eth_if0;
1970
1971               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1972               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1973               eth_if0 =
1974                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1975
1976               /* only support ethernet interface type for now */
1977               error0 =
1978                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1979                 : error0;
1980
1981               if (error0 == ICMP6_ERROR_NONE)
1982                 {
1983                   u32 ri;
1984
1985                   /* look up the radv_t information for this interface */
1986                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1987                       sw_if_index0)
1988                     {
1989                       ri =
1990                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1991
1992                       if (ri != ~0)
1993                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1994                     }
1995
1996                   error0 =
1997                     ((!radv_info) ?
1998                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1999                      error0);
2000
2001                   if (error0 == ICMP6_ERROR_NONE)
2002                     {
2003                       radv_info->keep_sending_rs = 0;
2004
2005                       ra_report_t r;
2006
2007                       r.sw_if_index = sw_if_index0;
2008                       memcpy (&r.router_address, &ip0->src_address, 16);
2009                       r.current_hop_limit = h0->current_hop_limit;
2010                       r.flags = h0->flags;
2011                       r.router_lifetime_in_sec =
2012                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
2013                       r.neighbor_reachable_time_in_msec =
2014                         clib_net_to_host_u32
2015                         (h0->neighbor_reachable_time_in_msec);
2016                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
2017                       r.prefixes = 0;
2018
2019                       /* validate advertised information */
2020                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
2021                           && (h0->current_hop_limit !=
2022                               radv_info->curr_hop_limit))
2023                         {
2024                           ip6_neighbor_syslog (vm, LOG_WARNING,
2025                                                "our AdvCurHopLimit on %U doesn't agree with %U",
2026                                                format_vnet_sw_if_index_name,
2027                                                vnm, sw_if_index0,
2028                                                format_ip6_address,
2029                                                &ip0->src_address);
2030                         }
2031
2032                       if ((h0->flags &
2033                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
2034                           != radv_info->adv_managed_flag)
2035                         {
2036                           ip6_neighbor_syslog (vm, LOG_WARNING,
2037                                                "our AdvManagedFlag on %U doesn't agree with %U",
2038                                                format_vnet_sw_if_index_name,
2039                                                vnm, sw_if_index0,
2040                                                format_ip6_address,
2041                                                &ip0->src_address);
2042                         }
2043
2044                       if ((h0->flags &
2045                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
2046                           != radv_info->adv_other_flag)
2047                         {
2048                           ip6_neighbor_syslog (vm, LOG_WARNING,
2049                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
2050                                                format_vnet_sw_if_index_name,
2051                                                vnm, sw_if_index0,
2052                                                format_ip6_address,
2053                                                &ip0->src_address);
2054                         }
2055
2056                       if ((h0->
2057                            time_in_msec_between_retransmitted_neighbor_solicitations
2058                            && radv_info->
2059                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
2060                           && (h0->
2061                               time_in_msec_between_retransmitted_neighbor_solicitations
2062                               !=
2063                               clib_host_to_net_u32 (radv_info->
2064                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
2065                         {
2066                           ip6_neighbor_syslog (vm, LOG_WARNING,
2067                                                "our AdvRetransTimer on %U doesn't agree with %U",
2068                                                format_vnet_sw_if_index_name,
2069                                                vnm, sw_if_index0,
2070                                                format_ip6_address,
2071                                                &ip0->src_address);
2072                         }
2073
2074                       if ((h0->neighbor_reachable_time_in_msec &&
2075                            radv_info->adv_neighbor_reachable_time_in_msec) &&
2076                           (h0->neighbor_reachable_time_in_msec !=
2077                            clib_host_to_net_u32
2078                            (radv_info->adv_neighbor_reachable_time_in_msec)))
2079                         {
2080                           ip6_neighbor_syslog (vm, LOG_WARNING,
2081                                                "our AdvReachableTime on %U doesn't agree with %U",
2082                                                format_vnet_sw_if_index_name,
2083                                                vnm, sw_if_index0,
2084                                                format_ip6_address,
2085                                                &ip0->src_address);
2086                         }
2087
2088                       /* check for MTU or prefix options or .. */
2089                       u8 *opt_hdr = (u8 *) (h0 + 1);
2090                       while (options_len0 > 0)
2091                         {
2092                           icmp6_neighbor_discovery_option_header_t *o0 =
2093                             (icmp6_neighbor_discovery_option_header_t *)
2094                             opt_hdr;
2095                           int opt_len = o0->n_data_u64s << 3;
2096                           icmp6_neighbor_discovery_option_type_t option_type =
2097                             o0->type;
2098
2099                           if (options_len0 < 2)
2100                             {
2101                               ip6_neighbor_syslog (vm, LOG_ERR,
2102                                                    "malformed RA packet on %U from %U",
2103                                                    format_vnet_sw_if_index_name,
2104                                                    vnm, sw_if_index0,
2105                                                    format_ip6_address,
2106                                                    &ip0->src_address);
2107                               break;
2108                             }
2109
2110                           if (opt_len == 0)
2111                             {
2112                               ip6_neighbor_syslog (vm, LOG_ERR,
2113                                                    " zero length option in RA on %U from %U",
2114                                                    format_vnet_sw_if_index_name,
2115                                                    vnm, sw_if_index0,
2116                                                    format_ip6_address,
2117                                                    &ip0->src_address);
2118                               break;
2119                             }
2120                           else if (opt_len > options_len0)
2121                             {
2122                               ip6_neighbor_syslog (vm, LOG_ERR,
2123                                                    "option length in RA packet  greater than total length on %U from %U",
2124                                                    format_vnet_sw_if_index_name,
2125                                                    vnm, sw_if_index0,
2126                                                    format_ip6_address,
2127                                                    &ip0->src_address);
2128                               break;
2129                             }
2130
2131                           options_len0 -= opt_len;
2132                           opt_hdr += opt_len;
2133
2134                           switch (option_type)
2135                             {
2136                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
2137                               {
2138                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2139                                   * h =
2140                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2141                                    *) (o0);
2142
2143                                 if (opt_len < sizeof (*h))
2144                                   break;
2145
2146                                 memcpy (r.slla, h->ethernet_address, 6);
2147                               }
2148                               break;
2149
2150                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
2151                               {
2152                                 icmp6_neighbor_discovery_mtu_option_t *h =
2153                                   (icmp6_neighbor_discovery_mtu_option_t
2154                                    *) (o0);
2155
2156                                 if (opt_len < sizeof (*h))
2157                                   break;
2158
2159                                 r.mtu = clib_net_to_host_u32 (h->mtu);
2160
2161                                 if ((h->mtu && radv_info->adv_link_mtu) &&
2162                                     (h->mtu !=
2163                                      clib_host_to_net_u32
2164                                      (radv_info->adv_link_mtu)))
2165                                   {
2166                                     ip6_neighbor_syslog (vm, LOG_WARNING,
2167                                                          "our AdvLinkMTU on %U doesn't agree with %U",
2168                                                          format_vnet_sw_if_index_name,
2169                                                          vnm, sw_if_index0,
2170                                                          format_ip6_address,
2171                                                          &ip0->src_address);
2172                                   }
2173                               }
2174                               break;
2175
2176                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
2177                               {
2178                                 icmp6_neighbor_discovery_prefix_information_option_t
2179                                   * h =
2180                                   (icmp6_neighbor_discovery_prefix_information_option_t
2181                                    *) (o0);
2182
2183                                 /* validate advertised prefix options  */
2184                                 ip6_radv_prefix_t *pr_info;
2185                                 u32 preferred, valid;
2186
2187                                 if (opt_len < sizeof (*h))
2188                                   break;
2189
2190                                 vec_validate (r.prefixes,
2191                                               vec_len (r.prefixes));
2192                                 ra_report_prefix_info_t *prefix =
2193                                   vec_elt_at_index (r.prefixes,
2194                                                     vec_len (r.prefixes) - 1);
2195
2196                                 preferred =
2197                                   clib_net_to_host_u32 (h->preferred_time);
2198                                 valid = clib_net_to_host_u32 (h->valid_time);
2199
2200                                 prefix->preferred_time = preferred;
2201                                 prefix->valid_time = valid;
2202                                 prefix->flags = h->flags & 0xc0;
2203                                 prefix->prefix.fp_len = h->dst_address_length;
2204                                 prefix->prefix.fp_addr.ip6 = h->dst_address;
2205                                 prefix->prefix.fp_proto = FIB_PROTOCOL_IP6;
2206
2207                                 /* look for matching prefix - if we our advertising it, it better be consistant */
2208                                 /* *INDENT-OFF* */
2209                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
2210                                 ({
2211
2212                                   ip6_address_t mask;
2213                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
2214
2215                                   if(pr_info->enabled &&
2216                                      (pr_info->prefix_len == h->dst_address_length) &&
2217                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
2218                                     {
2219                                       /* found it */
2220                                       if(!pr_info->decrement_lifetime_flag &&
2221                                          valid != pr_info->adv_valid_lifetime_in_secs)
2222                                         {
2223                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2224                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
2225                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2226                                                               format_ip6_address, &h->dst_address);
2227                                         }
2228                                       if(!pr_info->decrement_lifetime_flag &&
2229                                          preferred != pr_info->adv_pref_lifetime_in_secs)
2230                                         {
2231                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2232                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
2233                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2234                                                               format_ip6_address, &h->dst_address);
2235                                         }
2236                                     }
2237                                   break;
2238                                 }));
2239                                 /* *INDENT-ON* */
2240                                 break;
2241                               }
2242                             default:
2243                               /* skip this one */
2244                               break;
2245                             }
2246                         }
2247                       ra_publish (&r);
2248                     }
2249                 }
2250             }
2251
2252           p0->error = error_node->errors[error0];
2253
2254           if (error0 != ICMP6_ERROR_NONE)
2255             vlib_error_count (vm, error_node->node_index, error0, 1);
2256
2257           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2258                                            to_next, n_left_to_next,
2259                                            bi0, next0);
2260         }
2261
2262       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2263     }
2264
2265   /* Account for router advertisements received. */
2266   vlib_error_count (vm, error_node->node_index,
2267                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2268                     n_advertisements_rcvd);
2269
2270   return frame->n_vectors;
2271 }
2272
2273 static inline f64
2274 random_f64_from_to (f64 from, f64 to)
2275 {
2276   static u32 seed = 0;
2277   static u8 seed_set = 0;
2278   if (!seed_set)
2279     {
2280       seed = random_default_seed ();
2281       seed_set = 1;
2282     }
2283   return random_f64 (&seed) * (to - from) + from;
2284 }
2285
2286 static inline u8
2287 get_mac_address (u32 sw_if_index, u8 * address)
2288 {
2289   vnet_main_t *vnm = vnet_get_main ();
2290   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
2291   if (!hw_if->hw_address)
2292     return 1;
2293   clib_memcpy (address, hw_if->hw_address, 6);
2294   return 0;
2295 }
2296
2297 static inline vlib_buffer_t *
2298 create_buffer_for_rs (vlib_main_t * vm, ip6_radv_t * radv_info)
2299 {
2300   u32 bi0;
2301   vlib_buffer_t *p0;
2302   icmp6_router_solicitation_header_t *rh;
2303   u16 payload_length;
2304   int bogus_length;
2305   u32 sw_if_index;
2306
2307   sw_if_index = radv_info->sw_if_index;
2308
2309   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
2310     {
2311       clib_warning ("buffer allocation failure");
2312       return 0;
2313     }
2314
2315   p0 = vlib_get_buffer (vm, bi0);
2316   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
2317   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2318
2319   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
2320   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
2321
2322   vnet_buffer (p0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2323
2324   rh = vlib_buffer_get_current (p0);
2325   p0->current_length = sizeof (*rh);
2326
2327   rh->neighbor.icmp.type = ICMP6_router_solicitation;
2328   rh->neighbor.icmp.code = 0;
2329   rh->neighbor.icmp.checksum = 0;
2330   rh->neighbor.reserved_must_be_zero = 0;
2331
2332   rh->link_layer_option.header.type =
2333     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2334   if (0 != get_mac_address (sw_if_index,
2335                             rh->link_layer_option.ethernet_address))
2336     {
2337       clib_warning ("interface with sw_if_index %u has no mac address",
2338                     sw_if_index);
2339       vlib_buffer_free (vm, &bi0, 1);
2340       return 0;
2341     }
2342   rh->link_layer_option.header.n_data_u64s = 1;
2343
2344   payload_length = sizeof (rh->neighbor) + sizeof (u64);
2345
2346   rh->ip.ip_version_traffic_class_and_flow_label =
2347     clib_host_to_net_u32 (0x6 << 28);
2348   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
2349   rh->ip.protocol = IP_PROTOCOL_ICMP6;
2350   rh->ip.hop_limit = 255;
2351   rh->ip.src_address = radv_info->link_local_address;
2352   /* set address ff02::2 */
2353   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
2354   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
2355
2356   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
2357                                                                   &rh->ip,
2358                                                                   &bogus_length);
2359
2360   return p0;
2361 }
2362
2363 static inline void
2364 stop_sending_rs (vlib_main_t * vm, ip6_radv_t * ra)
2365 {
2366   u32 bi0;
2367
2368   ra->keep_sending_rs = 0;
2369   if (ra->buffer)
2370     {
2371       bi0 = vlib_get_buffer_index (vm, ra->buffer);
2372       vlib_buffer_free (vm, &bi0, 1);
2373       ra->buffer = 0;
2374     }
2375 }
2376
2377 static inline bool
2378 check_send_rs (vlib_main_t * vm, ip6_radv_t * radv_info, f64 current_time,
2379                f64 * due_time)
2380 {
2381   vlib_buffer_t *p0;
2382   vlib_frame_t *f;
2383   u32 *to_next;
2384   u32 next_index;
2385   vlib_buffer_t *c0;
2386   u32 ci0;
2387
2388   icmp6_send_router_solicitation_params_t *params;
2389
2390   if (!radv_info->keep_sending_rs)
2391     return false;
2392
2393   params = &radv_info->params;
2394
2395   if (radv_info->due_time > current_time)
2396     {
2397       *due_time = radv_info->due_time;
2398       return true;
2399     }
2400
2401   p0 = radv_info->buffer;
2402
2403   next_index = ip6_rewrite_mcast_node.index;
2404
2405   c0 = vlib_buffer_copy (vm, p0);
2406   if (c0 == 0)
2407     return radv_info->keep_sending_rs;
2408
2409   ci0 = vlib_get_buffer_index (vm, c0);
2410
2411   f = vlib_get_frame_to_node (vm, next_index);
2412   to_next = vlib_frame_vector_args (f);
2413   to_next[0] = ci0;
2414   f->n_vectors = 1;
2415   vlib_put_frame_to_node (vm, next_index, f);
2416
2417   if (params->mrc != 0 && --radv_info->n_left == 0)
2418     stop_sending_rs (vm, radv_info);
2419   else
2420     {
2421       radv_info->sleep_interval =
2422         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
2423       if (radv_info->sleep_interval > params->mrt)
2424         radv_info->sleep_interval =
2425           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
2426
2427       radv_info->due_time = current_time + radv_info->sleep_interval;
2428
2429       if (params->mrd != 0
2430           && current_time > radv_info->start_time + params->mrd)
2431         stop_sending_rs (vm, radv_info);
2432       else
2433         *due_time = radv_info->due_time;
2434     }
2435
2436   return radv_info->keep_sending_rs;
2437 }
2438
2439 static uword
2440 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
2441                  vlib_frame_t * f0)
2442 {
2443   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2444   ip6_radv_t *radv_info;
2445   uword *event_data = 0;
2446   f64 sleep_time = 1e9;
2447   f64 current_time;
2448   f64 due_time;
2449   f64 dt = 0;
2450
2451   while (true)
2452     {
2453       vlib_process_wait_for_event_or_clock (vm, sleep_time);
2454       vlib_process_get_events (vm, &event_data);
2455       vec_reset_length (event_data);
2456
2457       current_time = vlib_time_now (vm);
2458       do
2459         {
2460           due_time = current_time + 1e9;
2461         /* *INDENT-OFF* */
2462         pool_foreach (radv_info, nm->if_radv_pool,
2463         ({
2464             if (check_send_rs (vm, radv_info, current_time, &dt)
2465                 && (dt < due_time))
2466               due_time = dt;
2467         }));
2468         /* *INDENT-ON* */
2469           current_time = vlib_time_now (vm);
2470         }
2471       while (due_time < current_time);
2472
2473       sleep_time = due_time - current_time;
2474     }
2475
2476   return 0;
2477 }
2478
2479 /* *INDENT-OFF* */
2480 VLIB_REGISTER_NODE (send_rs_process_node) = {
2481     .function = send_rs_process,
2482     .type = VLIB_NODE_TYPE_PROCESS,
2483     .name = "send-rs-process",
2484 };
2485 /* *INDENT-ON* */
2486
2487 void
2488 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
2489                                 icmp6_send_router_solicitation_params_t *
2490                                 params)
2491 {
2492   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2493   u32 rai;
2494   ip6_radv_t *ra = 0;
2495
2496   ASSERT (~0 != sw_if_index);
2497
2498   rai = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2499   ra = pool_elt_at_index (nm->if_radv_pool, rai);
2500
2501   stop_sending_rs (vm, ra);
2502
2503   if (!stop)
2504     {
2505       ra->keep_sending_rs = 1;
2506       ra->params = *params;
2507       ra->n_left = params->mrc;
2508       ra->start_time = vlib_time_now (vm);
2509       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
2510       ra->due_time = 0;         /* send first packet ASAP */
2511       ra->buffer = create_buffer_for_rs (vm, ra);
2512       if (!ra->buffer)
2513         ra->keep_sending_rs = 0;
2514       else
2515         vlib_process_signal_event (vm, send_rs_process_node.index, 1, 0);
2516     }
2517 }
2518
2519 /**
2520  * @brief Add a multicast Address to the advertised MLD set
2521  */
2522 static void
2523 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2524 {
2525   ip6_mldp_group_t *mcast_group_info;
2526   uword *p;
2527
2528   /* lookup  mldp info for this interface */
2529   p = mhash_get (&radv_info->address_to_mldp_index, addr);
2530   mcast_group_info =
2531     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2532
2533   /* add address */
2534   if (!mcast_group_info)
2535     {
2536       /* add */
2537       u32 mi;
2538       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2539
2540       mi = mcast_group_info - radv_info->mldp_group_pool;
2541       mhash_set (&radv_info->address_to_mldp_index, addr, mi,   /* old_value */
2542                  0);
2543
2544       mcast_group_info->type = 4;
2545       mcast_group_info->mcast_source_address_pool = 0;
2546       mcast_group_info->num_sources = 0;
2547       clib_memcpy (&mcast_group_info->mcast_address, addr,
2548                    sizeof (ip6_address_t));
2549     }
2550 }
2551
2552 /**
2553  * @brief Delete a multicast Address from the advertised MLD set
2554  */
2555 static void
2556 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2557 {
2558   ip6_mldp_group_t *mcast_group_info;
2559   uword *p;
2560
2561   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2562   mcast_group_info =
2563     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2564
2565   if (mcast_group_info)
2566     {
2567       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2568                    /* old_value */ 0);
2569       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2570     }
2571 }
2572
2573 /**
2574  * @brief Add a multicast Address to the advertised MLD set
2575  */
2576 static void
2577 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2578                           ip6_multicast_address_scope_t scope,
2579                           ip6_multicast_link_local_group_id_t group)
2580 {
2581   ip6_address_t addr;
2582
2583   ip6_set_reserved_multicast_address (&addr, scope, group);
2584
2585   ip6_neighbor_add_mld_prefix (a, &addr);
2586 }
2587
2588 /**
2589  * @brief create and initialize router advertisement parameters with default
2590  * values for this intfc
2591  */
2592 u32
2593 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2594                                    u32 sw_if_index, u32 is_add)
2595 {
2596   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2597   ip6_radv_t *a = 0;
2598   u32 ri = ~0;
2599   vnet_sw_interface_t *sw_if0;
2600   ethernet_interface_t *eth_if0 = 0;
2601
2602   /* lookup radv container  - ethernet interfaces only */
2603   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2604   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2605     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2606
2607   if (!eth_if0)
2608     return ri;
2609
2610   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2611                            ~0);
2612   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2613
2614   if (ri != ~0)
2615     {
2616       a = pool_elt_at_index (nm->if_radv_pool, ri);
2617
2618       if (!is_add)
2619         {
2620           ip6_radv_prefix_t *p;
2621           ip6_mldp_group_t *m;
2622
2623           /* release the lock on the interface's mcast adj */
2624           adj_unlock (a->mcast_adj_index);
2625
2626           /* clean up prefix and MDP pools */
2627           /* *INDENT-OFF* */
2628           pool_flush(p, a->adv_prefixes_pool,
2629           ({
2630               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2631           }));
2632           pool_flush (m, a->mldp_group_pool,
2633           ({
2634               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2635           }));
2636           /* *INDENT-ON* */
2637
2638           pool_free (a->mldp_group_pool);
2639           pool_free (a->adv_prefixes_pool);
2640
2641           mhash_free (&a->address_to_prefix_index);
2642           mhash_free (&a->address_to_mldp_index);
2643
2644           if (a->keep_sending_rs)
2645             a->keep_sending_rs = 0;
2646
2647           pool_put (nm->if_radv_pool, a);
2648           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2649           ri = ~0;
2650         }
2651     }
2652   else
2653     {
2654       if (is_add)
2655         {
2656           pool_get (nm->if_radv_pool, a);
2657
2658           ri = a - nm->if_radv_pool;
2659           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2660
2661           /* initialize default values (most of which are zero) */
2662           clib_memset (a, 0, sizeof (a[0]));
2663
2664           a->sw_if_index = sw_if_index;
2665           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2666           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2667           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2668           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2669
2670           /* send ll address source address option */
2671           a->adv_link_layer_address = 1;
2672
2673           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2674           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2675           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2676           a->seed = (u32) clib_cpu_time_now ();
2677           (void) random_u32 (&a->seed);
2678           a->randomizer = clib_cpu_time_now ();
2679           (void) random_u64 (&a->randomizer);
2680
2681           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2682           a->initial_adverts_sent = a->initial_adverts_count - 1;
2683           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2684
2685           /* deafult is to send */
2686           a->send_radv = 1;
2687
2688           /* fill in radv_info for this interface that will be needed later */
2689           a->adv_link_mtu =
2690             vnet_sw_interface_get_mtu (vnm, sw_if_index, VNET_MTU_IP6);
2691
2692           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2693
2694           /* fill in default link-local address  (this may be overridden) */
2695           ip6_link_local_address_from_ethernet_mac_address
2696             (&a->link_local_address, eth_if0->address);
2697
2698           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2699                       sizeof (ip6_address_t));
2700           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2701                       sizeof (ip6_address_t));
2702
2703           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2704                                                       VNET_LINK_IP6,
2705                                                       sw_if_index);
2706
2707           a->keep_sending_rs = 0;
2708
2709           /* add multicast groups we will always be reporting  */
2710           ip6_neighbor_add_mld_grp (a,
2711                                     IP6_MULTICAST_SCOPE_link_local,
2712                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2713           ip6_neighbor_add_mld_grp (a,
2714                                     IP6_MULTICAST_SCOPE_link_local,
2715                                     IP6_MULTICAST_GROUP_ID_all_routers);
2716           ip6_neighbor_add_mld_grp (a,
2717                                     IP6_MULTICAST_SCOPE_link_local,
2718                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2719         }
2720     }
2721   return ri;
2722 }
2723
2724 /* send an mldpv2 report  */
2725 static void
2726 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2727 {
2728   vnet_main_t *vnm = vnet_get_main ();
2729   vlib_main_t *vm = vnm->vlib_main;
2730   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2731   vnet_sw_interface_t *sw_if0;
2732   ethernet_interface_t *eth_if0;
2733   u32 ri;
2734   int bogus_length;
2735
2736   ip6_radv_t *radv_info;
2737   u16 payload_length;
2738   vlib_buffer_t *b0;
2739   ip6_header_t *ip0;
2740   u32 *to_next;
2741   vlib_frame_t *f;
2742   u32 bo0;
2743   u32 n_to_alloc = 1;
2744   u32 n_allocated;
2745
2746   icmp6_multicast_listener_report_header_t *rh0;
2747   icmp6_multicast_listener_report_packet_t *rp0;
2748
2749   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2750   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2751   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2752
2753   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2754     return;
2755
2756   /* look up the radv_t  information for this interface */
2757   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2758                            ~0);
2759
2760   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2761
2762   if (ri == ~0)
2763     return;
2764
2765   /* send report now - build a mldpv2 report packet  */
2766   n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2767   if (PREDICT_FALSE (n_allocated == 0))
2768     {
2769     alloc_fail:
2770       clib_warning ("buffer allocation failure");
2771       return;
2772     }
2773
2774   b0 = vlib_get_buffer (vm, bo0);
2775
2776   /* adjust the sizeof the buffer to just include the ipv6 header */
2777   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2778
2779   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2780
2781   b0->error = ICMP6_ERROR_NONE;
2782
2783   rp0 = vlib_buffer_get_current (b0);
2784   ip0 = (ip6_header_t *) & rp0->ip;
2785   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2786
2787   clib_memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2788
2789   ip0->ip_version_traffic_class_and_flow_label =
2790     clib_host_to_net_u32 (0x6 << 28);
2791
2792   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2793   /* for DEBUG - vnet driver won't seem to emit router alerts */
2794   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2795   ip0->hop_limit = 1;
2796
2797   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2798
2799   /* source address MUST be the link-local address */
2800   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2801   ip0->src_address = radv_info->link_local_address;
2802
2803   /* destination is all mldpv2 routers */
2804   ip6_set_reserved_multicast_address (&ip0->dst_address,
2805                                       IP6_MULTICAST_SCOPE_link_local,
2806                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2807
2808   /* add reports here */
2809   ip6_mldp_group_t *m;
2810   int num_addr_records = 0;
2811   icmp6_multicast_address_record_t rr;
2812
2813   /* fill in the hop-by-hop extension header (router alert) info */
2814   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2815   rh0->ext_hdr.n_data_u64s = 0;
2816
2817   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2818   rh0->alert.len = 2;
2819   rh0->alert.value = 0;
2820
2821   rh0->pad.type = 1;
2822   rh0->pad.len = 0;
2823
2824   rh0->icmp.checksum = 0;
2825
2826   /* *INDENT-OFF* */
2827   pool_foreach (m, radv_info->mldp_group_pool,
2828   ({
2829     rr.type = m->type;
2830     rr.aux_data_len_u32s = 0;
2831     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2832     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2833
2834     num_addr_records++;
2835
2836     if(vlib_buffer_add_data (vm, &bo0, (void *)&rr,
2837                              sizeof(icmp6_multicast_address_record_t)))
2838       {
2839         vlib_buffer_free (vm, &bo0, 1);
2840         goto alloc_fail;
2841       }
2842
2843     payload_length += sizeof( icmp6_multicast_address_record_t);
2844   }));
2845   /* *INDENT-ON* */
2846
2847   rh0->rsvd = 0;
2848   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2849
2850   /* update lengths */
2851   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2852
2853   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2854                                                           &bogus_length);
2855   ASSERT (bogus_length == 0);
2856
2857   /*
2858    * OK to override w/ no regard for actual FIB, because
2859    * ip6-rewrite only looks at the adjacency.
2860    */
2861   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2862     vnet_main.local_interface_sw_if_index;
2863
2864   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2865   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2866
2867   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2868
2869   f = vlib_get_frame_to_node (vm, node->index);
2870   to_next = vlib_frame_vector_args (f);
2871   to_next[0] = bo0;
2872   f->n_vectors = 1;
2873
2874   vlib_put_frame_to_node (vm, node->index, f);
2875   return;
2876 }
2877
2878 /* *INDENT-OFF* */
2879 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2880 {
2881   .function = icmp6_router_solicitation,
2882   .name = "icmp6-router-solicitation",
2883
2884   .vector_size = sizeof (u32),
2885
2886   .format_trace = format_icmp6_input_trace,
2887
2888   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2889   .next_nodes = {
2890     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
2891     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2892     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2893   },
2894 };
2895 /* *INDENT-ON* */
2896
2897 /* send a RA or update the timer info etc.. */
2898 static uword
2899 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2900                                   vlib_node_runtime_t * node,
2901                                   vlib_frame_t * frame)
2902 {
2903   vnet_main_t *vnm = vnet_get_main ();
2904   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2905   ip6_radv_t *radv_info;
2906   vlib_frame_t *f = 0;
2907   u32 n_this_frame = 0;
2908   u32 n_left_to_next = 0;
2909   u32 *to_next = 0;
2910   u32 bo0;
2911   icmp6_router_solicitation_header_t *h0;
2912   vlib_buffer_t *b0;
2913   f64 now = vlib_time_now (vm);
2914
2915   /* Interface ip6 radv info list */
2916   /* *INDENT-OFF* */
2917   pool_foreach (radv_info, nm->if_radv_pool,
2918   ({
2919     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2920       {
2921         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2922         radv_info->next_multicast_time = now;
2923         radv_info->last_multicast_time = now;
2924         radv_info->last_radv_time = 0;
2925         radv_info->all_routers_mcast = 0;
2926         continue;
2927       }
2928
2929     /* Make sure that we've joined the all-routers multicast group */
2930     if(!radv_info->all_routers_mcast)
2931       {
2932         /* send MDLP_REPORT_EVENT message */
2933         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2934         radv_info->all_routers_mcast = 1;
2935       }
2936
2937     /* is it time to send a multicast  RA on this interface? */
2938     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2939       {
2940         u32 n_to_alloc = 1;
2941         u32 n_allocated;
2942
2943         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2944           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2945
2946         /* multicast send - compute next multicast send time */
2947         if( radv_info->initial_adverts_sent > 0)
2948           {
2949             radv_info->initial_adverts_sent--;
2950             if(rfn > radv_info-> initial_adverts_interval)
2951               rfn =  radv_info-> initial_adverts_interval;
2952
2953             /* check to see if we are ceasing to send */
2954             if( radv_info->initial_adverts_sent  == 0)
2955               if(radv_info->cease_radv)
2956                 radv_info->send_radv = 0;
2957           }
2958
2959         radv_info->next_multicast_time =  rfn + now;
2960         radv_info->last_multicast_time = now;
2961
2962         /* send advert now - build a "solicted" router advert with unspecified source address */
2963         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2964
2965         if (PREDICT_FALSE(n_allocated == 0))
2966           {
2967             clib_warning ("buffer allocation failure");
2968             continue;
2969           }
2970         b0 = vlib_get_buffer (vm, bo0);
2971         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2972         b0->error = ICMP6_ERROR_NONE;
2973         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2974
2975         h0 =  vlib_buffer_get_current (b0);
2976
2977         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2978
2979         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2980         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2981                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2982         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2983         h0->ip.hop_limit = 255;
2984
2985         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
2986         h0->ip.src_address.as_u64[0] = 0;
2987         h0->ip.src_address.as_u64[1] = 0;
2988
2989         h0->ip.dst_address.as_u64[0] = 0;
2990         h0->ip.dst_address.as_u64[1] = 0;
2991
2992         h0->neighbor.icmp.type = ICMP6_router_solicitation;
2993
2994         if (PREDICT_FALSE(f == 0))
2995           {
2996             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
2997             to_next = vlib_frame_vector_args (f);
2998             n_left_to_next = VLIB_FRAME_SIZE;
2999             n_this_frame = 0;
3000           }
3001
3002         n_this_frame++;
3003         n_left_to_next--;
3004         to_next[0] = bo0;
3005         to_next += 1;
3006
3007         if (PREDICT_FALSE(n_left_to_next == 0))
3008           {
3009             f->n_vectors = n_this_frame;
3010             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3011             f = 0;
3012           }
3013       }
3014   }));
3015   /* *INDENT-ON* */
3016
3017   if (f)
3018     {
3019       ASSERT (n_this_frame);
3020       f->n_vectors = n_this_frame;
3021       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3022     }
3023   return 0;
3024 }
3025
3026 static uword
3027 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
3028                                            vlib_node_runtime_t * node,
3029                                            vlib_frame_t * frame)
3030 {
3031   uword event_type;
3032   ip6_icmp_neighbor_discovery_event_data_t *event_data;
3033
3034   /* init code here */
3035
3036   while (1)
3037     {
3038       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
3039
3040       event_data = vlib_process_get_event_data (vm, &event_type);
3041
3042       if (!event_data)
3043         {
3044           /* No events found: timer expired. */
3045           /* process interface list and send RAs as appropriate, update timer info */
3046           ip6_neighbor_process_timer_event (vm, node, frame);
3047         }
3048       else
3049         {
3050           switch (event_type)
3051             {
3052
3053             case ICMP6_ND_EVENT_INIT:
3054               break;
3055
3056             case ~0:
3057               break;
3058
3059             default:
3060               ASSERT (0);
3061             }
3062
3063           if (event_data)
3064             _vec_len (event_data) = 0;
3065         }
3066     }
3067   return frame->n_vectors;
3068 }
3069
3070 /* *INDENT-OFF* */
3071 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
3072 {
3073   .function = icmp6_router_advertisement,
3074   .name = "icmp6-router-advertisement",
3075
3076   .vector_size = sizeof (u32),
3077
3078   .format_trace = format_icmp6_input_trace,
3079
3080   .n_next_nodes = 1,
3081   .next_nodes = {
3082     [0] = "ip6-drop",
3083   },
3084 };
3085 /* *INDENT-ON* */
3086
3087 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
3088
3089   .function = ip6_icmp_neighbor_discovery_event_process,
3090   .name = "ip6-icmp-neighbor-discovery-event-process",
3091   .type = VLIB_NODE_TYPE_PROCESS,
3092 };
3093
3094 static uword
3095 icmp6_neighbor_solicitation (vlib_main_t * vm,
3096                              vlib_node_runtime_t * node, vlib_frame_t * frame)
3097 {
3098   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3099                                                        /* is_solicitation */
3100                                                        1);
3101 }
3102
3103 static uword
3104 icmp6_neighbor_advertisement (vlib_main_t * vm,
3105                               vlib_node_runtime_t * node,
3106                               vlib_frame_t * frame)
3107 {
3108   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3109                                                        /* is_solicitation */
3110                                                        0);
3111 }
3112
3113 /* *INDENT-OFF* */
3114 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
3115 {
3116   .function = icmp6_neighbor_solicitation,
3117   .name = "icmp6-neighbor-solicitation",
3118
3119   .vector_size = sizeof (u32),
3120
3121   .format_trace = format_icmp6_input_trace,
3122
3123   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
3124   .next_nodes = {
3125     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "ip6-drop",
3126     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
3127   },
3128 };
3129 /* *INDENT-ON* */
3130
3131 /* *INDENT-OFF* */
3132 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
3133 {
3134   .function = icmp6_neighbor_advertisement,
3135   .name = "icmp6-neighbor-advertisement",
3136
3137   .vector_size = sizeof (u32),
3138
3139   .format_trace = format_icmp6_input_trace,
3140
3141   .n_next_nodes = 1,
3142   .next_nodes = {
3143     [0] = "ip6-drop",
3144   },
3145 };
3146 /* *INDENT-ON* */
3147
3148 typedef enum
3149 {
3150   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3151   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
3152   IP6_DISCOVER_NEIGHBOR_N_NEXT,
3153 } ip6_discover_neighbor_next_t;
3154
3155 typedef enum
3156 {
3157   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
3158   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
3159   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
3160 } ip6_discover_neighbor_error_t;
3161
3162 static uword
3163 ip6_discover_neighbor_inline (vlib_main_t * vm,
3164                               vlib_node_runtime_t * node,
3165                               vlib_frame_t * frame, int is_glean)
3166 {
3167   vnet_main_t *vnm = vnet_get_main ();
3168   ip6_main_t *im = &ip6_main;
3169   ip_lookup_main_t *lm = &im->lookup_main;
3170   u32 *from, *to_next_drop;
3171   uword n_left_from, n_left_to_next_drop;
3172   u64 seed;
3173   u32 thread_index = vm->thread_index;
3174   int bogus_length;
3175   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3176
3177   if (node->flags & VLIB_NODE_FLAG_TRACE)
3178     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
3179
3180   seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm));
3181
3182   from = vlib_frame_vector_args (frame);
3183   n_left_from = frame->n_vectors;
3184
3185   while (n_left_from > 0)
3186     {
3187       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3188                            to_next_drop, n_left_to_next_drop);
3189
3190       while (n_left_from > 0 && n_left_to_next_drop > 0)
3191         {
3192           u32 pi0, adj_index0, sw_if_index0, drop0, r0, next0;
3193           vnet_hw_interface_t *hw_if0;
3194           ip6_radv_t *radv_info;
3195           ip_adjacency_t *adj0;
3196           vlib_buffer_t *p0;
3197           ip6_header_t *ip0;
3198
3199           pi0 = from[0];
3200
3201           p0 = vlib_get_buffer (vm, pi0);
3202
3203           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
3204
3205           ip0 = vlib_buffer_get_current (p0);
3206
3207           adj0 = adj_get (adj_index0);
3208
3209           if (!is_glean)
3210             {
3211               ip0->dst_address.as_u64[0] =
3212                 adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
3213               ip0->dst_address.as_u64[1] =
3214                 adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
3215             }
3216
3217           sw_if_index0 = adj0->rewrite_header.sw_if_index;
3218           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
3219
3220           /* combine the address and interface for a hash */
3221           r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0;
3222
3223           drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed);
3224
3225           from += 1;
3226           n_left_from -= 1;
3227           to_next_drop[0] = pi0;
3228           to_next_drop += 1;
3229           n_left_to_next_drop -= 1;
3230
3231           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
3232
3233           /* If the interface is link-down, drop the pkt */
3234           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
3235             drop0 = 1;
3236
3237           if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0)
3238             {
3239               u32 ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
3240
3241               if (ri != ~0)
3242                 radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3243               else
3244                 drop0 = 1;
3245             }
3246           else
3247             drop0 = 1;
3248
3249           /*
3250            * the adj has been updated to a rewrite but the node the DPO that got
3251            * us here hasn't - yet. no big deal. we'll drop while we wait.
3252            */
3253           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
3254             drop0 = 1;
3255
3256           p0->error =
3257             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
3258                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
3259
3260           if (drop0)
3261             continue;
3262
3263           {
3264             u32 bi0 = 0;
3265             icmp6_neighbor_solicitation_header_t *h0;
3266             vlib_buffer_t *b0;
3267
3268             h0 = vlib_packet_template_get_packet
3269               (vm, &im->discover_neighbor_packet_template, &bi0);
3270             if (!h0)
3271               continue;
3272
3273             /* copy the persistent fields from the original */
3274             b0 = vlib_get_buffer (vm, bi0);
3275             clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
3276
3277             /*
3278              * Build ethernet header.
3279              * Choose source address based on destination lookup
3280              * adjacency.
3281              */
3282             if (!ip6_src_address_for_packet (lm,
3283                                              sw_if_index0,
3284                                              &ip0->dst_address,
3285                                              &h0->ip.src_address))
3286               {
3287                 /* There is no address on the interface */
3288                 p0->error =
3289                   node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
3290                 vlib_buffer_free (vm, &bi0, 1);
3291                 continue;
3292               }
3293
3294             /*
3295              * Destination address is a solicited node multicast address.
3296              * We need to fill in
3297              * the low 24 bits with low 24 bits of target's address.
3298              */
3299             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
3300             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
3301             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
3302
3303             h0->neighbor.target_address = ip0->dst_address;
3304
3305             clib_memcpy (h0->link_layer_option.ethernet_address,
3306                          hw_if0->hw_address, vec_len (hw_if0->hw_address));
3307
3308             /* $$$$ appears we need this; why is the checksum non-zero? */
3309             h0->neighbor.icmp.checksum = 0;
3310             h0->neighbor.icmp.checksum =
3311               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
3312                                                  &bogus_length);
3313
3314             ASSERT (bogus_length == 0);
3315
3316             vlib_buffer_copy_trace_flag (vm, p0, bi0);
3317             vnet_buffer (b0)->sw_if_index[VLIB_TX]
3318               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
3319
3320             vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
3321               radv_info->mcast_adj_index;
3322
3323             b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
3324             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
3325
3326             vlib_set_next_frame_buffer (vm, node, next0, bi0);
3327           }
3328         }
3329
3330       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3331                            n_left_to_next_drop);
3332     }
3333
3334   return frame->n_vectors;
3335 }
3336
3337 static uword
3338 ip6_discover_neighbor (vlib_main_t * vm,
3339                        vlib_node_runtime_t * node, vlib_frame_t * frame)
3340 {
3341   return (ip6_discover_neighbor_inline (vm, node, frame, 0));
3342 }
3343
3344 static uword
3345 ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
3346 {
3347   return (ip6_discover_neighbor_inline (vm, node, frame, 1));
3348 }
3349
3350 static char *ip6_discover_neighbor_error_strings[] = {
3351   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
3352   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
3353   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
3354     = "no source address for ND solicitation",
3355 };
3356
3357 /* *INDENT-OFF* */
3358 VLIB_REGISTER_NODE (ip6_glean_node) =
3359 {
3360   .function = ip6_glean,
3361   .name = "ip6-glean",
3362   .vector_size = sizeof (u32),
3363   .format_trace = format_ip6_forward_next_trace,
3364   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3365   .error_strings = ip6_discover_neighbor_error_strings,
3366   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3367   .next_nodes =
3368   {
3369     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3370     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3371   },
3372 };
3373 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
3374 {
3375   .function = ip6_discover_neighbor,
3376   .name = "ip6-discover-neighbor",
3377   .vector_size = sizeof (u32),
3378   .format_trace = format_ip6_forward_next_trace,
3379   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3380   .error_strings = ip6_discover_neighbor_error_strings,
3381   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3382   .next_nodes =
3383   {
3384     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3385     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3386   },
3387 };
3388 /* *INDENT-ON* */
3389
3390 /* API support functions */
3391 int
3392 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
3393                         u8 suppress, u8 managed, u8 other,
3394                         u8 ll_option, u8 send_unicast, u8 cease,
3395                         u8 use_lifetime, u32 lifetime,
3396                         u32 initial_count, u32 initial_interval,
3397                         u32 max_interval, u32 min_interval, u8 is_no)
3398 {
3399   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3400   int error;
3401   u32 ri;
3402
3403   /* look up the radv_t  information for this interface */
3404   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3405                            ~0);
3406   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3407   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3408
3409   if (!error)
3410     {
3411
3412       ip6_radv_t *radv_info;
3413       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3414
3415       if ((max_interval != 0) && (min_interval == 0))
3416         min_interval = .75 * max_interval;
3417
3418       max_interval =
3419         (max_interval !=
3420          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
3421         radv_info->max_radv_interval;
3422       min_interval =
3423         (min_interval !=
3424          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
3425         radv_info->min_radv_interval;
3426       lifetime =
3427         (use_lifetime !=
3428          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
3429         radv_info->adv_router_lifetime_in_sec;
3430
3431       if (lifetime)
3432         {
3433           if (lifetime > MAX_DEF_RTR_LIFETIME)
3434             lifetime = MAX_DEF_RTR_LIFETIME;
3435
3436           if (lifetime <= max_interval)
3437             return VNET_API_ERROR_INVALID_VALUE;
3438         }
3439
3440       if (min_interval != 0)
3441         {
3442           if ((min_interval > .75 * max_interval) || (min_interval < 3))
3443             return VNET_API_ERROR_INVALID_VALUE;
3444         }
3445
3446       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
3447           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
3448         return VNET_API_ERROR_INVALID_VALUE;
3449
3450       /*
3451          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
3452          if "flag" is clear  don't change corresponding value
3453        */
3454       radv_info->send_radv =
3455         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
3456       radv_info->adv_managed_flag =
3457         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
3458       radv_info->adv_other_flag =
3459         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
3460       radv_info->adv_link_layer_address =
3461         (ll_option !=
3462          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
3463       radv_info->send_unicast =
3464         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
3465       radv_info->cease_radv =
3466         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
3467
3468       radv_info->min_radv_interval = min_interval;
3469       radv_info->max_radv_interval = max_interval;
3470       radv_info->adv_router_lifetime_in_sec = lifetime;
3471
3472       radv_info->initial_adverts_count =
3473         (initial_count !=
3474          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
3475         radv_info->initial_adverts_count;
3476       radv_info->initial_adverts_interval =
3477         (initial_interval !=
3478          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
3479         radv_info->initial_adverts_interval;
3480
3481       /* restart */
3482       if ((cease != 0) && (is_no))
3483         radv_info->send_radv = 1;
3484
3485       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3486       radv_info->next_multicast_time = vlib_time_now (vm);
3487       radv_info->last_multicast_time = vlib_time_now (vm);
3488       radv_info->last_radv_time = 0;
3489     }
3490   return (error);
3491 }
3492
3493 int
3494 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
3495                         ip6_address_t * prefix_addr, u8 prefix_len,
3496                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
3497                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
3498                         u8 no_onlink, u8 is_no)
3499 {
3500   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3501   int error;
3502
3503   u32 ri;
3504
3505   /* look up the radv_t  information for this interface */
3506   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3507                            ~0);
3508
3509   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3510
3511   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3512
3513   if (!error)
3514     {
3515       f64 now = vlib_time_now (vm);
3516       ip6_radv_t *radv_info;
3517       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3518
3519       /* prefix info add, delete or update */
3520       ip6_radv_prefix_t *prefix;
3521
3522       /* lookup  prefix info for this  address on this interface */
3523       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
3524
3525       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
3526
3527       if (is_no)
3528         {
3529           /* delete */
3530           if (!prefix)
3531             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
3532
3533           if (prefix->prefix_len != prefix_len)
3534             return VNET_API_ERROR_INVALID_VALUE_2;
3535
3536           /* FIXME - Should the DP do this or the CP ? */
3537           /* do specific delete processing here before returning */
3538           /* try to remove from routing table */
3539
3540           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
3541                        /* old_value */ 0);
3542           pool_put (radv_info->adv_prefixes_pool, prefix);
3543
3544           radv_info->initial_adverts_sent =
3545             radv_info->initial_adverts_count - 1;
3546           radv_info->next_multicast_time = vlib_time_now (vm);
3547           radv_info->last_multicast_time = vlib_time_now (vm);
3548           radv_info->last_radv_time = 0;
3549           return (error);
3550         }
3551
3552       /* adding or changing */
3553       if (!prefix)
3554         {
3555           /* add */
3556           u32 pi;
3557           pool_get (radv_info->adv_prefixes_pool, prefix);
3558           pi = prefix - radv_info->adv_prefixes_pool;
3559           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
3560                      /* old_value */ 0);
3561
3562           clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
3563
3564           prefix->prefix_len = prefix_len;
3565           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
3566
3567           /* initialize default values */
3568           prefix->adv_on_link_flag = 1; /* L bit set */
3569           prefix->adv_autonomous_flag = 1;      /* A bit set */
3570           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
3571           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
3572           prefix->enabled = 1;
3573           prefix->decrement_lifetime_flag = 1;
3574           prefix->deprecated_prefix_flag = 1;
3575
3576           if (off_link == 0)
3577             {
3578               /* FIXME - Should the DP do this or the CP ? */
3579               /* insert prefix into routing table as a connected prefix */
3580             }
3581
3582           if (use_default)
3583             goto restart;
3584         }
3585       else
3586         {
3587
3588           if (prefix->prefix_len != prefix_len)
3589             return VNET_API_ERROR_INVALID_VALUE_2;
3590
3591           if (off_link != 0)
3592             {
3593               /* FIXME - Should the DP do this or the CP ? */
3594               /* remove from routing table if already there */
3595             }
3596         }
3597
3598       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
3599         {
3600           prefix->adv_valid_lifetime_in_secs = ~0;
3601           prefix->adv_pref_lifetime_in_secs = ~0;
3602           prefix->decrement_lifetime_flag = 0;
3603         }
3604       else
3605         {
3606           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
3607           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
3608         }
3609
3610       /* copy  remaining */
3611       prefix->enabled = !(no_advertise != 0);
3612       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
3613       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
3614
3615     restart:
3616       /* restart */
3617       /* fill in the expiration times  */
3618       prefix->valid_lifetime_expires =
3619         now + prefix->adv_valid_lifetime_in_secs;
3620       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
3621
3622       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3623       radv_info->next_multicast_time = vlib_time_now (vm);
3624       radv_info->last_multicast_time = vlib_time_now (vm);
3625       radv_info->last_radv_time = 0;
3626     }
3627   return (error);
3628 }
3629
3630 clib_error_t *
3631 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
3632                   vlib_cli_command_t * cmd)
3633 {
3634   vnet_main_t *vnm = vnet_get_main ();
3635   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3636   clib_error_t *error = 0;
3637   u8 is_no = 0;
3638   u8 suppress = 0, managed = 0, other = 0;
3639   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
3640   u8 use_lifetime = 0;
3641   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
3642     0, ra_initial_interval = 0;
3643   u32 ra_max_interval = 0, ra_min_interval = 0;
3644
3645   unformat_input_t _line_input, *line_input = &_line_input;
3646   vnet_sw_interface_t *sw_if0;
3647
3648   int add_radv_info = 1;
3649   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
3650   ip6_address_t ip6_addr;
3651   u32 addr_len;
3652
3653
3654   /* Get a line of input. */
3655   if (!unformat_user (main_input, unformat_line_input, line_input))
3656     return 0;
3657
3658   /* get basic radv info for this interface */
3659   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3660     {
3661
3662       if (unformat_user (line_input,
3663                          unformat_vnet_sw_interface, vnm, &sw_if_index))
3664         {
3665           u32 ri;
3666           ethernet_interface_t *eth_if0 = 0;
3667
3668           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3669           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3670             eth_if0 =
3671               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3672
3673           if (!eth_if0)
3674             {
3675               error =
3676                 clib_error_return (0, "Interface must be of ethernet type");
3677               goto done;
3678             }
3679
3680           /* look up the radv_t  information for this interface */
3681           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3682                                    sw_if_index, ~0);
3683
3684           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3685
3686           if (ri != ~0)
3687             {
3688               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3689             }
3690           else
3691             {
3692               error = clib_error_return (0, "unknown interface %U'",
3693                                          format_unformat_error, line_input);
3694               goto done;
3695             }
3696         }
3697       else
3698         {
3699           error = clib_error_return (0, "invalid interface name %U'",
3700                                      format_unformat_error, line_input);
3701           goto done;
3702         }
3703     }
3704
3705   /* get the rest of the command */
3706   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3707     {
3708       if (unformat (line_input, "no"))
3709         is_no = 1;
3710       else if (unformat (line_input, "prefix %U/%d",
3711                          unformat_ip6_address, &ip6_addr, &addr_len))
3712         {
3713           add_radv_info = 0;
3714         }
3715       else if (unformat (line_input, "ra-managed-config-flag"))
3716         {
3717           managed = 1;
3718         }
3719       else if (unformat (line_input, "ra-other-config-flag"))
3720         {
3721           other = 1;
3722         }
3723       else if (unformat (line_input, "ra-suppress") ||
3724                unformat (line_input, "ra-surpress"))
3725         {
3726           suppress = 1;
3727         }
3728       else if (unformat (line_input, "ra-suppress-link-layer") ||
3729                unformat (line_input, "ra-surpress-link-layer"))
3730         {
3731           suppress_ll_option = 1;
3732         }
3733       else if (unformat (line_input, "ra-send-unicast"))
3734         {
3735           send_unicast = 1;
3736         }
3737       else if (unformat (line_input, "ra-lifetime"))
3738         {
3739           if (!unformat (line_input, "%d", &ra_lifetime))
3740             {
3741               error = unformat_parse_error (line_input);
3742               goto done;
3743             }
3744           use_lifetime = 1;
3745         }
3746       else if (unformat (line_input, "ra-initial"))
3747         {
3748           if (!unformat
3749               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3750             {
3751               error = unformat_parse_error (line_input);
3752               goto done;
3753             }
3754         }
3755       else if (unformat (line_input, "ra-interval"))
3756         {
3757           if (!unformat (line_input, "%d", &ra_max_interval))
3758             {
3759               error = unformat_parse_error (line_input);
3760               goto done;
3761             }
3762
3763           if (!unformat (line_input, "%d", &ra_min_interval))
3764             ra_min_interval = 0;
3765         }
3766       else if (unformat (line_input, "ra-cease"))
3767         {
3768           cease = 1;
3769         }
3770       else
3771         {
3772           error = unformat_parse_error (line_input);
3773           goto done;
3774         }
3775     }
3776
3777   if (add_radv_info)
3778     {
3779       ip6_neighbor_ra_config (vm, sw_if_index,
3780                               suppress, managed, other,
3781                               suppress_ll_option, send_unicast, cease,
3782                               use_lifetime, ra_lifetime,
3783                               ra_initial_count, ra_initial_interval,
3784                               ra_max_interval, ra_min_interval, is_no);
3785     }
3786   else
3787     {
3788       u32 valid_lifetime_in_secs = 0;
3789       u32 pref_lifetime_in_secs = 0;
3790       u8 use_prefix_default_values = 0;
3791       u8 no_advertise = 0;
3792       u8 off_link = 0;
3793       u8 no_autoconfig = 0;
3794       u8 no_onlink = 0;
3795
3796       /* get the rest of the command */
3797       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3798         {
3799           if (unformat (line_input, "default"))
3800             {
3801               use_prefix_default_values = 1;
3802               break;
3803             }
3804           else if (unformat (line_input, "infinite"))
3805             {
3806               valid_lifetime_in_secs = ~0;
3807               pref_lifetime_in_secs = ~0;
3808               break;
3809             }
3810           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3811                              &pref_lifetime_in_secs))
3812             break;
3813           else
3814             break;
3815         }
3816
3817
3818       /* get the rest of the command */
3819       while (!use_prefix_default_values &&
3820              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3821         {
3822           if (unformat (line_input, "no-advertise"))
3823             no_advertise = 1;
3824           else if (unformat (line_input, "off-link"))
3825             off_link = 1;
3826           else if (unformat (line_input, "no-autoconfig"))
3827             no_autoconfig = 1;
3828           else if (unformat (line_input, "no-onlink"))
3829             no_onlink = 1;
3830           else
3831             {
3832               error = unformat_parse_error (line_input);
3833               goto done;
3834             }
3835         }
3836
3837       ip6_neighbor_ra_prefix (vm, sw_if_index,
3838                               &ip6_addr, addr_len,
3839                               use_prefix_default_values,
3840                               valid_lifetime_in_secs,
3841                               pref_lifetime_in_secs,
3842                               no_advertise,
3843                               off_link, no_autoconfig, no_onlink, is_no);
3844     }
3845
3846 done:
3847   unformat_free (line_input);
3848
3849   return error;
3850 }
3851
3852 static void
3853 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3854 {
3855   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3856   u32 i;
3857
3858   for (i = 0; i < vec_len (addrs); i++)
3859     {
3860       ip_interface_address_t *a =
3861         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3862       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3863
3864       vlib_cli_output (vm, "\t\t%U/%d",
3865                        format_ip6_address, address, a->address_length);
3866     }
3867 }
3868
3869 static clib_error_t *
3870 show_ip6_interface_cmd (vlib_main_t * vm,
3871                         unformat_input_t * input, vlib_cli_command_t * cmd)
3872 {
3873   vnet_main_t *vnm = vnet_get_main ();
3874   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3875   clib_error_t *error = 0;
3876   u32 sw_if_index;
3877
3878   sw_if_index = ~0;
3879
3880   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3881     {
3882       u32 ri;
3883
3884       /* look up the radv_t  information for this interface */
3885       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3886                                sw_if_index, ~0);
3887
3888       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3889
3890       if (ri != ~0)
3891         {
3892           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3893           ip6_radv_t *radv_info;
3894           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3895
3896           vlib_cli_output (vm, "%U is admin %s\n",
3897                            format_vnet_sw_interface_name, vnm,
3898                            vnet_get_sw_interface (vnm, sw_if_index),
3899                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3900                             "up" : "down"));
3901
3902           u32 ai;
3903           u32 *link_scope = 0, *global_scope = 0;
3904           u32 *local_scope = 0, *unknown_scope = 0;
3905           ip_interface_address_t *a;
3906
3907           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3908                                    sw_if_index, ~0);
3909           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3910
3911           while (ai != (u32) ~ 0)
3912             {
3913               a = pool_elt_at_index (lm->if_address_pool, ai);
3914               ip6_address_t *address =
3915                 ip_interface_address_get_address (lm, a);
3916
3917               if (ip6_address_is_link_local_unicast (address))
3918                 vec_add1 (link_scope, ai);
3919               else if (ip6_address_is_global_unicast (address))
3920                 vec_add1 (global_scope, ai);
3921               else if (ip6_address_is_local_unicast (address))
3922                 vec_add1 (local_scope, ai);
3923               else
3924                 vec_add1 (unknown_scope, ai);
3925
3926               ai = a->next_this_sw_interface;
3927             }
3928
3929           if (vec_len (link_scope))
3930             {
3931               vlib_cli_output (vm, "\tLink-local address(es):\n");
3932               ip6_print_addrs (vm, link_scope);
3933               vec_free (link_scope);
3934             }
3935
3936           if (vec_len (local_scope))
3937             {
3938               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3939               ip6_print_addrs (vm, local_scope);
3940               vec_free (local_scope);
3941             }
3942
3943           if (vec_len (global_scope))
3944             {
3945               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3946               ip6_print_addrs (vm, global_scope);
3947               vec_free (global_scope);
3948             }
3949
3950           if (vec_len (unknown_scope))
3951             {
3952               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3953               ip6_print_addrs (vm, unknown_scope);
3954               vec_free (unknown_scope);
3955             }
3956
3957           vlib_cli_output (vm, "\tLink-local address(es):\n");
3958           vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3959                            &radv_info->link_local_address);
3960
3961           vlib_cli_output (vm, "\tJoined group address(es):\n");
3962           ip6_mldp_group_t *m;
3963           /* *INDENT-OFF* */
3964           pool_foreach (m, radv_info->mldp_group_pool,
3965           ({
3966             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3967                              &m->mcast_address);
3968           }));
3969           /* *INDENT-ON* */
3970
3971           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3972           ip6_radv_prefix_t *p;
3973           /* *INDENT-OFF* */
3974           pool_foreach (p, radv_info->adv_prefixes_pool,
3975           ({
3976             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
3977                              format_ip6_address, &p->prefix, p->prefix_len);
3978           }));
3979           /* *INDENT-ON* */
3980
3981           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
3982           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
3983           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
3984           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
3985           vlib_cli_output (vm, "\tND DAD is disabled\n");
3986           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
3987           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
3988                            radv_info->adv_neighbor_reachable_time_in_msec);
3989           vlib_cli_output (vm,
3990                            "\tND advertised retransmit interval is %d (msec)\n",
3991                            radv_info->
3992                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
3993
3994           u32 ra_interval = radv_info->max_radv_interval;
3995           u32 ra_interval_min = radv_info->min_radv_interval;
3996           vlib_cli_output (vm,
3997                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
3998                            ra_interval, ra_interval_min);
3999           vlib_cli_output (vm,
4000                            "\tND router advertisements live for %d seconds\n",
4001                            radv_info->adv_router_lifetime_in_sec);
4002           vlib_cli_output (vm,
4003                            "\tHosts %s stateless autoconfig for addresses\n",
4004                            (radv_info->adv_managed_flag) ? "use" :
4005                            " don't use");
4006           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
4007                            radv_info->n_advertisements_sent);
4008           vlib_cli_output (vm, "\tND router solicitations received %d\n",
4009                            radv_info->n_solicitations_rcvd);
4010           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
4011                            radv_info->n_solicitations_dropped);
4012         }
4013       else
4014         {
4015           error = clib_error_return (0, "IPv6 not enabled on interface",
4016                                      format_unformat_error, input);
4017
4018         }
4019     }
4020   return error;
4021 }
4022
4023 /*?
4024  * This command is used to display various IPv6 attributes on a given
4025  * interface.
4026  *
4027  * @cliexpar
4028  * Example of how to display IPv6 settings:
4029  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4030  * GigabitEthernet2/0/0 is admin up
4031  *         Link-local address(es):
4032  *                 fe80::ab8/64
4033  *         Joined group address(es):
4034  *                 ff02::1
4035  *                 ff02::2
4036  *                 ff02::16
4037  *                 ff02::1:ff00:ab8
4038  *         Advertised Prefixes:
4039  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
4040  *         MTU is 1500
4041  *         ICMP error messages are unlimited
4042  *         ICMP redirects are disabled
4043  *         ICMP unreachables are not sent
4044  *         ND DAD is disabled
4045  *         ND advertised reachable time is 0
4046  *         ND advertised retransmit interval is 0 (msec)
4047  *         ND router advertisements are sent every 200 seconds (min interval is 150)
4048  *         ND router advertisements live for 600 seconds
4049  *         Hosts use stateless autoconfig for addresses
4050  *         ND router advertisements sent 19336
4051  *         ND router solicitations received 0
4052  *         ND router solicitations dropped 0
4053  * @cliexend
4054  * Example of output if IPv6 is not enabled on the interface:
4055  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4056  * show ip6 interface: IPv6 not enabled on interface
4057  * @cliexend
4058 ?*/
4059 /* *INDENT-OFF* */
4060 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
4061 {
4062   .path = "show ip6 interface",
4063   .function = show_ip6_interface_cmd,
4064   .short_help = "show ip6 interface <interface>",
4065 };
4066 /* *INDENT-ON* */
4067
4068 clib_error_t *
4069 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4070 {
4071   clib_error_t *error = 0;
4072   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4073   u32 ri;
4074
4075   /* look up the radv_t  information for this interface */
4076   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4077                            ~0);
4078   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4079
4080   /* if not created - do nothing */
4081   if (ri != ~0)
4082     {
4083       ip6_radv_t *radv_info;
4084
4085       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4086
4087       /* check radv_info ref count for other ip6 addresses on this interface */
4088       /* This implicitly excludes the link local address */
4089       if (radv_info->ref_count == 0)
4090         {
4091           /* essentially "disables" ipv6 on this interface */
4092           ip6_ll_prefix_t ilp = {
4093             .ilp_addr = radv_info->link_local_address,
4094             .ilp_sw_if_index = sw_if_index,
4095           };
4096           ip6_ll_table_entry_delete (&ilp);
4097           ip6_sw_interface_enable_disable (sw_if_index, 0);
4098           ip6_mfib_interface_enable_disable (sw_if_index, 0);
4099           ip6_neighbor_sw_interface_add_del (vnet_get_main (), sw_if_index,
4100                                              0);
4101         }
4102     }
4103   return error;
4104 }
4105
4106 int
4107 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
4108 {
4109   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4110   u32 ri = ~0;
4111
4112   /* look up the radv_t  information for this interface */
4113   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4114                            ~0);
4115
4116   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4117
4118   return ri != ~0;
4119 }
4120
4121 clib_error_t *
4122 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4123 {
4124   clib_error_t *error = 0;
4125   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4126   u32 ri;
4127   int is_add = 1;
4128
4129   /* look up the radv_t  information for this interface */
4130   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4131                            ~0);
4132
4133   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4134
4135   /* if not created yet */
4136   if (ri == ~0)
4137     {
4138       vnet_main_t *vnm = vnet_get_main ();
4139       vnet_sw_interface_t *sw_if0;
4140
4141       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
4142       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
4143         {
4144           ethernet_interface_t *eth_if0;
4145
4146           eth_if0 =
4147             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
4148           if (eth_if0)
4149             {
4150               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
4151               ri =
4152                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
4153
4154               if (ri != ~0)
4155                 {
4156                   ip6_radv_t *radv_info;
4157                   ip6_address_t link_local_address;
4158
4159                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4160
4161                   ip6_link_local_address_from_ethernet_mac_address
4162                     (&link_local_address, eth_if0->address);
4163
4164                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
4165                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB ||
4166                       sw_if0->type == VNET_SW_INTERFACE_TYPE_PIPE ||
4167                       sw_if0->type == VNET_SW_INTERFACE_TYPE_P2P)
4168                     {
4169                       /* make up  an interface id */
4170                       link_local_address.as_u64[1] =
4171                         random_u64 (&radv_info->randomizer);
4172
4173                       link_local_address.as_u64[0] =
4174                         clib_host_to_net_u64 (0xFE80000000000000ULL);
4175                       /* clear u bit */
4176                       link_local_address.as_u8[8] &= 0xfd;
4177                     }
4178                   {
4179                     ip6_ll_prefix_t ilp = {
4180                       .ilp_addr = link_local_address,
4181                       .ilp_sw_if_index = sw_if_index,
4182                     };
4183
4184                     ip6_ll_table_entry_update (&ilp, FIB_ROUTE_PATH_LOCAL);
4185                   }
4186
4187                   /* essentially "enables" ipv6 on this interface */
4188                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
4189                   ip6_sw_interface_enable_disable (sw_if_index, 1);
4190
4191                   if (!error)
4192                     {
4193                       radv_info->link_local_address = link_local_address;
4194                     }
4195                 }
4196             }
4197         }
4198     }
4199   return error;
4200 }
4201
4202 int
4203 ip6_get_ll_address (u32 sw_if_index, ip6_address_t * addr)
4204 {
4205   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4206   ip6_radv_t *radv_info;
4207   u32 ri;
4208
4209   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) <= sw_if_index)
4210     return 0;
4211
4212   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4213
4214   if (ri == ~0)
4215     return 0;
4216
4217   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4218   *addr = radv_info->link_local_address;
4219
4220   return (!0);
4221 }
4222
4223 static clib_error_t *
4224 enable_ip6_interface_cmd (vlib_main_t * vm,
4225                           unformat_input_t * input, vlib_cli_command_t * cmd)
4226 {
4227   vnet_main_t *vnm = vnet_get_main ();
4228   clib_error_t *error = 0;
4229   u32 sw_if_index;
4230
4231   sw_if_index = ~0;
4232
4233   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4234     {
4235       enable_ip6_interface (vm, sw_if_index);
4236     }
4237   else
4238     {
4239       error = clib_error_return (0, "unknown interface\n'",
4240                                  format_unformat_error, input);
4241
4242     }
4243   return error;
4244 }
4245
4246 /*?
4247  * This command is used to enable IPv6 on a given interface.
4248  *
4249  * @cliexpar
4250  * Example of how enable IPv6 on a given interface:
4251  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
4252 ?*/
4253 /* *INDENT-OFF* */
4254 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
4255 {
4256   .path = "enable ip6 interface",
4257   .function = enable_ip6_interface_cmd,
4258   .short_help = "enable ip6 interface <interface>",
4259 };
4260 /* *INDENT-ON* */
4261
4262 static clib_error_t *
4263 disable_ip6_interface_cmd (vlib_main_t * vm,
4264                            unformat_input_t * input, vlib_cli_command_t * cmd)
4265 {
4266   vnet_main_t *vnm = vnet_get_main ();
4267   clib_error_t *error = 0;
4268   u32 sw_if_index;
4269
4270   sw_if_index = ~0;
4271
4272   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4273     {
4274       error = disable_ip6_interface (vm, sw_if_index);
4275     }
4276   else
4277     {
4278       error = clib_error_return (0, "unknown interface\n'",
4279                                  format_unformat_error, input);
4280
4281     }
4282   return error;
4283 }
4284
4285 /*?
4286  * This command is used to disable IPv6 on a given interface.
4287  *
4288  * @cliexpar
4289  * Example of how disable IPv6 on a given interface:
4290  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
4291 ?*/
4292 /* *INDENT-OFF* */
4293 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
4294 {
4295   .path = "disable ip6 interface",
4296   .function = disable_ip6_interface_cmd,
4297   .short_help = "disable ip6 interface <interface>",
4298 };
4299 /* *INDENT-ON* */
4300
4301 /*?
4302  * This command is used to configure the neighbor discovery
4303  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
4304  * command to display some of the current neighbor discovery parameters
4305  * on a given interface. This command has three formats:
4306  *
4307  *
4308  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
4309  *
4310  * '<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>'
4311  *
4312  * Where:
4313  *
4314  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
4315  * router-advertisement messages to use stateful address
4316  * auto-configuration to obtain address information (sets the M-bit).
4317  * Default is the M-bit is not set and the '<em>no</em>' option
4318  * returns it to this default state.
4319  *
4320  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
4321  * router-advertisement messages that hosts use stateful auto
4322  * configuration to obtain nonaddress related information (sets
4323  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
4324  * option returns it to this default state.
4325  *
4326  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
4327  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
4328  * router-advertisement messages.
4329  *
4330  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
4331  * optional source link-layer address in the ICMPv6 router-advertisement
4332  * messages. Default is to include the optional source link-layer address
4333  * and the '<em>no</em>' option returns it to this default state.
4334  *
4335  * <em>[no] ra-send-unicast</em> - Use the source address of the
4336  * router-solicitation message if availiable. The default is to use
4337  * multicast address of all nodes, and the '<em>no</em>' option returns
4338  * it to this default state.
4339  *
4340  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
4341  * default router in ICMPv6 router-advertisement messages. The range is
4342  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
4343  * '<em><max-interval></em>'. The default value is 600 seconds and the
4344  * '<em>no</em>' option returns it to this default value.
4345  *
4346  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
4347  * router-advertisement messages sent and the interval between each
4348  * message. Range for count is 1 - 3 and default is 3. Range for interval
4349  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
4350  * returns both to their default value.
4351  *
4352  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
4353  * interval between sending ICMPv6 router-advertisement messages. The
4354  * range for max-interval is from 4 to 200 seconds. min-interval can not
4355  * be more than 75% of max-interval. If not set, min-interval will be
4356  * set to 75% of max-interval. The range for min-interval is from 3 to
4357  * 150 seconds.  The '<em>no</em>' option returns both to their default
4358  * value.
4359  *
4360  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
4361  * The '<em>no</em>' options implies to start (or restart) sending
4362  * ICMPv6 router-advertisement messages.
4363  *
4364  *
4365  * <b>Format 2 - Prefix Options:</b>
4366  *
4367  * '<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>'
4368  *
4369  * Where:
4370  *
4371  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
4372  *
4373  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
4374  * length of time in seconds during what the prefix is valid for the purpose of
4375  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
4376  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
4377  * length of time in seconds during what addresses generated from the prefix remain
4378  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
4379  *
4380  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
4381  * are inifinte, no timeout.
4382  *
4383  * <em>no-advertise</em> - Do not send full router address in prefix
4384  * advertisement. Default is to advertise (i.e. - This flag is off by default).
4385  *
4386  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
4387  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
4388  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
4389  *
4390  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
4391  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
4392  *
4393  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
4394  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
4395  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
4396  * the L-bit.
4397  *
4398  *
4399  * <b>Format 3: - Default of Prefix:</b>
4400  *
4401  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
4402  *
4403  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
4404  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
4405  * is ignored and the prefix is deleted.
4406  *
4407  *
4408  * @cliexpar
4409  * Example of how set a router advertisement option:
4410  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
4411  * Example of how to add a prefix:
4412  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
4413  * Example of how to delete a prefix:
4414  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
4415 ?*/
4416 /* *INDENT-OFF* */
4417 VLIB_CLI_COMMAND (ip6_nd_command, static) =
4418 {
4419   .path = "ip6 nd",
4420   .short_help = "ip6 nd <interface> ...",
4421   .function = ip6_neighbor_cmd,
4422 };
4423 /* *INDENT-ON* */
4424
4425 clib_error_t *
4426 ip6_neighbor_set_link_local_address (vlib_main_t * vm, u32 sw_if_index,
4427                                      ip6_address_t * address)
4428 {
4429   clib_error_t *error = 0;
4430   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4431   u32 ri;
4432   ip6_radv_t *radv_info;
4433   vnet_main_t *vnm = vnet_get_main ();
4434   ip6_ll_prefix_t pfx = { 0, };
4435
4436   if (!ip6_address_is_link_local_unicast (address))
4437     return (error = clib_error_return (0, "address not link-local",
4438                                        format_unformat_error));
4439
4440   /* call enable ipv6  */
4441   enable_ip6_interface (vm, sw_if_index);
4442
4443   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4444
4445   if (ri != ~0)
4446     {
4447       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4448
4449       pfx.ilp_sw_if_index = sw_if_index;
4450
4451       pfx.ilp_addr = radv_info->link_local_address;
4452       ip6_ll_table_entry_delete (&pfx);
4453
4454       pfx.ilp_addr = *address;
4455       ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_LOCAL);
4456
4457       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4458       radv_info->link_local_address = *address;
4459     }
4460   else
4461     {
4462       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
4463       error = clib_error_return (0, "ip6 not enabled for interface",
4464                                  format_unformat_error);
4465     }
4466   return error;
4467 }
4468
4469 /**
4470  * @brief callback when an interface address is added or deleted
4471  */
4472 static void
4473 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
4474                                         uword opaque,
4475                                         u32 sw_if_index,
4476                                         ip6_address_t * address,
4477                                         u32 address_length,
4478                                         u32 if_address_index, u32 is_delete)
4479 {
4480   vnet_main_t *vnm = vnet_get_main ();
4481   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4482   u32 ri;
4483   vlib_main_t *vm = vnm->vlib_main;
4484   ip6_radv_t *radv_info;
4485   ip6_address_t a;
4486
4487   /* create solicited node multicast address for this interface address */
4488   ip6_set_solicited_node_multicast_address (&a, 0);
4489
4490   a.as_u8[0xd] = address->as_u8[0xd];
4491   a.as_u8[0xe] = address->as_u8[0xe];
4492   a.as_u8[0xf] = address->as_u8[0xf];
4493
4494   if (!is_delete)
4495     {
4496       /* try to  create radv_info - does nothing if ipv6 already enabled */
4497       enable_ip6_interface (vm, sw_if_index);
4498
4499       /* look up the radv_t  information for this interface */
4500       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4501                                sw_if_index, ~0);
4502       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4503       if (ri != ~0)
4504         {
4505           /* get radv_info */
4506           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4507
4508           /* add address */
4509           if (!ip6_address_is_link_local_unicast (address))
4510             radv_info->ref_count++;
4511
4512           ip6_neighbor_add_mld_prefix (radv_info, &a);
4513         }
4514     }
4515   else
4516     {
4517
4518       /* delete */
4519       /* look up the radv_t  information for this interface */
4520       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4521                                sw_if_index, ~0);
4522       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4523
4524       if (ri != ~0)
4525         {
4526           /* get radv_info */
4527           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4528
4529           ip6_neighbor_del_mld_prefix (radv_info, &a);
4530
4531           /* if interface up send MLDP "report" */
4532           radv_info->all_routers_mcast = 0;
4533
4534           /* add address */
4535           if (!ip6_address_is_link_local_unicast (address))
4536             radv_info->ref_count--;
4537         }
4538       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
4539       disable_ip6_interface (vm, sw_if_index);
4540     }
4541 }
4542
4543 clib_error_t *
4544 ip6_set_neighbor_limit (u32 neighbor_limit)
4545 {
4546   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4547
4548   nm->limit_neighbor_cache_size = neighbor_limit;
4549   return 0;
4550 }
4551
4552 static void
4553 ip6_neighbor_table_bind (ip6_main_t * im,
4554                          uword opaque,
4555                          u32 sw_if_index,
4556                          u32 new_fib_index, u32 old_fib_index)
4557 {
4558   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4559   ip6_neighbor_t *n = NULL;
4560   u32 i, *to_re_add = 0;
4561
4562   /* *INDENT-OFF* */
4563   pool_foreach (n, nm->neighbor_pool,
4564   ({
4565     if (n->key.sw_if_index == sw_if_index)
4566       vec_add1 (to_re_add, n - nm->neighbor_pool);
4567   }));
4568   /* *INDENT-ON* */
4569
4570   for (i = 0; i < vec_len (to_re_add); i++)
4571     {
4572       n = pool_elt_at_index (nm->neighbor_pool, to_re_add[i]);
4573       ip6_neighbor_adj_fib_remove (n, old_fib_index);
4574       ip6_neighbor_adj_fib_add (n, new_fib_index);
4575     }
4576   vec_free (to_re_add);
4577 }
4578
4579 static clib_error_t *
4580 ip6_neighbor_init (vlib_main_t * vm)
4581 {
4582   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4583   ip6_main_t *im = &ip6_main;
4584
4585   mhash_init (&nm->neighbor_index_by_key,
4586               /* value size */ sizeof (uword),
4587               /* key size */ sizeof (ip6_neighbor_key_t));
4588
4589   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
4590                        ip6_icmp_neighbor_solicitation_node.index);
4591   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
4592                        ip6_icmp_neighbor_advertisement_node.index);
4593   icmp6_register_type (vm, ICMP6_router_solicitation,
4594                        ip6_icmp_router_solicitation_node.index);
4595   icmp6_register_type (vm, ICMP6_router_advertisement,
4596                        ip6_icmp_router_advertisement_node.index);
4597
4598   /* handler node for ip6 neighbor discovery events and timers */
4599   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
4600
4601   /* add call backs */
4602   ip6_add_del_interface_address_callback_t cb;
4603   clib_memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
4604
4605   /* when an interface address changes... */
4606   cb.function = ip6_neighbor_add_del_interface_address;
4607   cb.function_opaque = 0;
4608   vec_add1 (im->add_del_interface_address_callbacks, cb);
4609
4610   ip6_table_bind_callback_t cbt;
4611   cbt.function = ip6_neighbor_table_bind;
4612   cbt.function_opaque = 0;
4613   vec_add1 (im->table_bind_callbacks, cbt);
4614
4615   mhash_init (&nm->pending_resolutions_by_address,
4616               /* value size */ sizeof (uword),
4617               /* key size */ sizeof (ip6_address_t));
4618
4619   mhash_init (&nm->mac_changes_by_address,
4620               /* value size */ sizeof (uword),
4621               /* key size */ sizeof (ip6_address_t));
4622
4623   /* default, configurable */
4624   nm->limit_neighbor_cache_size = 50000;
4625
4626   nm->wc_ip6_nd_publisher_node = (uword) ~ 0;
4627
4628   nm->ip6_ra_publisher_node = (uword) ~ 0;
4629
4630 #if 0
4631   /* $$$$ Hack fix for today */
4632   vec_validate_init_empty
4633     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
4634 #endif
4635
4636   return 0;
4637 }
4638
4639 VLIB_INIT_FUNCTION (ip6_neighbor_init);
4640
4641
4642 void
4643 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
4644                                              void *address_arg,
4645                                              uword node_index,
4646                                              uword type_opaque, uword data)
4647 {
4648   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4649   ip6_address_t *address = address_arg;
4650   uword *p;
4651   pending_resolution_t *pr;
4652
4653   pool_get (nm->pending_resolutions, pr);
4654
4655   pr->next_index = ~0;
4656   pr->node_index = node_index;
4657   pr->type_opaque = type_opaque;
4658   pr->data = data;
4659
4660   p = mhash_get (&nm->pending_resolutions_by_address, address);
4661   if (p)
4662     {
4663       /* Insert new resolution at the head of the list */
4664       pr->next_index = p[0];
4665       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
4666     }
4667
4668   mhash_set (&nm->pending_resolutions_by_address, address,
4669              pr - nm->pending_resolutions, 0 /* old value */ );
4670 }
4671
4672 int
4673 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
4674                                   ip6_nd_change_event_cb_t data_callback,
4675                                   u32 pid,
4676                                   void *address_arg,
4677                                   uword node_index,
4678                                   uword type_opaque, uword data, int is_add)
4679 {
4680   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4681   ip6_address_t *address = address_arg;
4682
4683   /* Try to find an existing entry */
4684   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
4685   u32 *p = first;
4686   pending_resolution_t *mc;
4687   while (p && *p != ~0)
4688     {
4689       mc = pool_elt_at_index (nm->mac_changes, *p);
4690       if (mc->node_index == node_index && mc->type_opaque == type_opaque
4691           && mc->pid == pid)
4692         break;
4693       p = &mc->next_index;
4694     }
4695
4696   int found = p && *p != ~0;
4697   if (is_add)
4698     {
4699       if (found)
4700         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
4701
4702       pool_get (nm->mac_changes, mc);
4703       /* *INDENT-OFF* */
4704       *mc = (pending_resolution_t)
4705       {
4706         .next_index = ~0,
4707         .node_index = node_index,
4708         .type_opaque = type_opaque,
4709         .data = data,
4710         .data_callback = data_callback,
4711         .pid = pid,
4712       };
4713       /* *INDENT-ON* */
4714
4715       /* Insert new resolution at the end of the list */
4716       u32 new_idx = mc - nm->mac_changes;
4717       if (p)
4718         p[0] = new_idx;
4719       else
4720         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
4721     }
4722   else
4723     {
4724       if (!found)
4725         return VNET_API_ERROR_NO_SUCH_ENTRY;
4726
4727       /* Clients may need to clean up pool entries, too */
4728       if (data_callback)
4729         (data_callback) (mc->data, NULL /* no new mac addrs */ , 0, NULL);
4730
4731       /* Remove the entry from the list and delete the entry */
4732       *p = mc->next_index;
4733       pool_put (nm->mac_changes, mc);
4734
4735       /* Remove from hash if we deleted the last entry */
4736       if (*p == ~0 && p == first)
4737         mhash_unset (&nm->mac_changes_by_address, address, 0);
4738     }
4739   return 0;
4740 }
4741
4742 int
4743 vnet_ip6_nd_term (vlib_main_t * vm,
4744                   vlib_node_runtime_t * node,
4745                   vlib_buffer_t * p0,
4746                   ethernet_header_t * eth,
4747                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4748 {
4749   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4750   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4751   mac_address_t mac;
4752
4753   mac_address_from_bytes (&mac, eth->src_address);
4754   ndh = ip6_next_header (ip);
4755   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4756       ndh->icmp.type != ICMP6_neighbor_advertisement)
4757     return 0;
4758
4759   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4760                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4761     {
4762       u8 *t0 = vlib_add_trace (vm, node, p0,
4763                                sizeof (icmp6_input_trace_t));
4764       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4765     }
4766
4767   /* Check if anyone want ND events for L2 BDs */
4768   if (PREDICT_FALSE
4769       (nm->wc_ip6_nd_publisher_node != (uword) ~ 0
4770        && !ip6_address_is_link_local_unicast (&ip->src_address)))
4771     {
4772       vnet_nd_wc_publish (sw_if_index, &mac, &ip->src_address);
4773     }
4774
4775   /* Check if MAC entry exsist for solicited target IP */
4776   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4777     {
4778       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4779       l2_bridge_domain_t *bd_config;
4780       u8 *macp;
4781
4782       opt = (void *) (ndh + 1);
4783       if ((opt->header.type !=
4784            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4785           (opt->header.n_data_u64s != 1))
4786         return 0;               /* source link layer address option not present */
4787
4788       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4789       macp =
4790         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4791       if (macp)
4792         {                       /* found ip-mac entry, generate eighbor advertisement response */
4793           int bogus_length;
4794           vlib_node_runtime_t *error_node =
4795             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4796           ip->dst_address = ip->src_address;
4797           ip->src_address = ndh->target_address;
4798           ip->hop_limit = 255;
4799           opt->header.type =
4800             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4801           clib_memcpy (opt->ethernet_address, macp, 6);
4802           ndh->icmp.type = ICMP6_neighbor_advertisement;
4803           ndh->advertisement_flags = clib_host_to_net_u32
4804             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4805              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4806           ndh->icmp.checksum = 0;
4807           ndh->icmp.checksum =
4808             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4809           clib_memcpy (eth->dst_address, eth->src_address, 6);
4810           clib_memcpy (eth->src_address, macp, 6);
4811           vlib_error_count (vm, error_node->node_index,
4812                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4813           return 1;
4814         }
4815     }
4816
4817   return 0;
4818
4819 }
4820
4821 int
4822 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4823 {
4824   u32 fib_index;
4825
4826   fib_prefix_t pfx = {
4827     .fp_len = 128,
4828     .fp_proto = FIB_PROTOCOL_IP6,
4829     .fp_addr = {
4830                 .ip6 = *addr,
4831                 },
4832   };
4833   ip46_address_t nh = {
4834     .ip6 = *addr,
4835   };
4836
4837   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4838
4839   if (~0 == fib_index)
4840     return VNET_API_ERROR_NO_SUCH_FIB;
4841
4842   if (is_del)
4843     {
4844       fib_table_entry_path_remove (fib_index,
4845                                    &pfx,
4846                                    FIB_SOURCE_IP6_ND_PROXY,
4847                                    DPO_PROTO_IP6,
4848                                    &nh,
4849                                    sw_if_index,
4850                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4851       /* flush the ND cache of this address if it's there */
4852       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (), sw_if_index, addr);
4853     }
4854   else
4855     {
4856       fib_table_entry_path_add (fib_index,
4857                                 &pfx,
4858                                 FIB_SOURCE_IP6_ND_PROXY,
4859                                 FIB_ENTRY_FLAG_NONE,
4860                                 DPO_PROTO_IP6,
4861                                 &nh,
4862                                 sw_if_index,
4863                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4864     }
4865   return (0);
4866 }
4867
4868 static clib_error_t *
4869 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4870                       unformat_input_t * input, vlib_cli_command_t * cmd)
4871 {
4872   vnet_main_t *vnm = vnet_get_main ();
4873   clib_error_t *error = 0;
4874   ip6_address_t addr;
4875   u32 sw_if_index;
4876   u8 is_del = 0;
4877
4878   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4879     {
4880       /* get the rest of the command */
4881       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4882         {
4883           if (unformat (input, "%U", unformat_ip6_address, &addr))
4884             break;
4885           else if (unformat (input, "delete") || unformat (input, "del"))
4886             is_del = 1;
4887           else
4888             return (unformat_parse_error (input));
4889         }
4890     }
4891
4892   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4893
4894   return error;
4895 }
4896
4897 /* *INDENT-OFF* */
4898 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4899 {
4900   .path = "set ip6 nd proxy",
4901   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4902   .function = set_ip6_nd_proxy_cmd,
4903 };
4904 /* *INDENT-ON* */
4905
4906 void
4907 ethernet_ndp_change_mac (u32 sw_if_index)
4908 {
4909   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4910   ip6_neighbor_t *n;
4911   adj_index_t ai;
4912
4913   /* *INDENT-OFF* */
4914   pool_foreach (n, nm->neighbor_pool,
4915   ({
4916     if (n->key.sw_if_index == sw_if_index)
4917       {
4918         adj_nbr_walk_nh6 (sw_if_index,
4919                           &n->key.ip6_address,
4920                           ip6_nd_mk_complete_walk, n);
4921       }
4922   }));
4923   /* *INDENT-ON* */
4924
4925   ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index);
4926
4927   if (ADJ_INDEX_INVALID != ai)
4928     adj_glean_update_rewrite (ai);
4929 }
4930
4931 void
4932 send_ip6_na (vlib_main_t * vm, u32 sw_if_index)
4933 {
4934   ip6_main_t *i6m = &ip6_main;
4935   ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index);
4936
4937   send_ip6_na_w_addr (vm, ip6_addr, sw_if_index);
4938 }
4939
4940 void
4941 send_ip6_na_w_addr (vlib_main_t * vm,
4942                     const ip6_address_t * ip6_addr, u32 sw_if_index)
4943 {
4944   ip6_main_t *i6m = &ip6_main;
4945   vnet_main_t *vnm = vnet_get_main ();
4946   u8 *rewrite, rewrite_len;
4947   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
4948   u8 dst_address[6];
4949
4950   if (ip6_addr)
4951     {
4952       clib_warning
4953         ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
4954          format_ip6_address, ip6_addr, sw_if_index);
4955
4956       /* Form unsolicited neighbor advertisement packet from NS pkt template */
4957       int bogus_length;
4958       u32 bi = 0;
4959       icmp6_neighbor_solicitation_header_t *h =
4960         vlib_packet_template_get_packet (vm,
4961                                          &i6m->discover_neighbor_packet_template,
4962                                          &bi);
4963       if (!h)
4964         return;
4965
4966       ip6_set_reserved_multicast_address (&h->ip.dst_address,
4967                                           IP6_MULTICAST_SCOPE_link_local,
4968                                           IP6_MULTICAST_GROUP_ID_all_hosts);
4969       h->ip.src_address = ip6_addr[0];
4970       h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
4971       h->neighbor.target_address = ip6_addr[0];
4972       h->neighbor.advertisement_flags = clib_host_to_net_u32
4973         (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4974       h->link_layer_option.header.type =
4975         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4976       clib_memcpy (h->link_layer_option.ethernet_address,
4977                    hi->hw_address, vec_len (hi->hw_address));
4978       h->neighbor.icmp.checksum =
4979         ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
4980       ASSERT (bogus_length == 0);
4981
4982       /* Setup MAC header with IP6 Etype and mcast DMAC */
4983       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
4984       ip6_multicast_ethernet_address (dst_address,
4985                                       IP6_MULTICAST_GROUP_ID_all_hosts);
4986       rewrite =
4987         ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address);
4988       rewrite_len = vec_len (rewrite);
4989       vlib_buffer_advance (b, -rewrite_len);
4990       ethernet_header_t *e = vlib_buffer_get_current (b);
4991       clib_memcpy (e->dst_address, rewrite, rewrite_len);
4992       vec_free (rewrite);
4993
4994       /* Send unsolicited ND advertisement packet out the specified interface */
4995       vnet_buffer (b)->sw_if_index[VLIB_RX] =
4996         vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
4997       vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
4998       u32 *to_next = vlib_frame_vector_args (f);
4999       to_next[0] = bi;
5000       f->n_vectors = 1;
5001       vlib_put_frame_to_node (vm, hi->output_node_index, f);
5002     }
5003 }
5004
5005 /*
5006  * fd.io coding-style-patch-verification: ON
5007  *
5008  * Local Variables:
5009  * eval: (c-set-style "gnu")
5010  * End:
5011  */