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
  30 /**
  31  * @file
  32  * @brief IPv6 Neighbor Adjacency and Neighbor Discovery.
  33  *
  34  * The files contains the API and CLI code for managing IPv6 neighbor
  35  * adjacency tables and neighbor discovery logic.
  36  */
  37
  38 /* can't use sizeof link_layer_address, that's 8 */
  39 #define ETHER_MAC_ADDR_LEN 6
  40
  41 /* advertised prefix option */
  42 typedef struct
  43 {
  44   /* basic advertised information */
  45   ip6_address_t prefix;
  46   u8 prefix_len;
  47   int adv_on_link_flag;
  48   int adv_autonomous_flag;
  49   u32 adv_valid_lifetime_in_secs;
  50   u32 adv_pref_lifetime_in_secs;
  51
  52   /* advertised values are computed from these times if decrementing */
  53   f64 valid_lifetime_expires;
  54   f64 pref_lifetime_expires;
  55
  56   /* local information */
  57   int enabled;
  58   int deprecated_prefix_flag;
  59   int decrement_lifetime_flag;
  60
  61 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  62 #define DEF_ADV_VALID_LIFETIME  2592000
  63 #define DEF_ADV_PREF_LIFETIME 604800
  64
  65   /* extensions are added here, mobile, DNS etc.. */
  66 } ip6_radv_prefix_t;
  67
  68
  69 typedef struct
  70 {
  71   /* group information */
  72   u8 type;
  73   ip6_address_t mcast_address;
  74   u16 num_sources;
  75   ip6_address_t *mcast_source_address_pool;
  76 } ip6_mldp_group_t;
  77
  78 /* configured router advertisement information per ipv6 interface */
  79 typedef struct
  80 {
  81
  82   /* advertised config information, zero means unspecified  */
  83   u8 curr_hop_limit;
  84   int adv_managed_flag;
  85   int adv_other_flag;
  86   u16 adv_router_lifetime_in_sec;
  87   u32 adv_neighbor_reachable_time_in_msec;
  88   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
  89
  90   /* mtu option */
  91   u32 adv_link_mtu;
  92
  93   /* source link layer option */
  94   u8 link_layer_address[8];
  95   u8 link_layer_addr_len;
  96
  97   /* prefix option */
  98   ip6_radv_prefix_t *adv_prefixes_pool;
  99
 100   /* Hash table mapping address to index in interface advertised  prefix pool. */
 101   mhash_t address_to_prefix_index;
 102
 103   /* MLDP  group information */
 104   ip6_mldp_group_t *mldp_group_pool;
 105
 106   /* Hash table mapping address to index in mldp address pool. */
 107   mhash_t address_to_mldp_index;
 108
 109   /* local information */
 110   u32 sw_if_index;
 111   int send_radv;                /* radv on/off on this interface -  set by config */
 112   int cease_radv;               /* we are ceasing  to send  - set byf config */
 113   int send_unicast;
 114   int adv_link_layer_address;
 115   int prefix_option;
 116   int failed_device_check;
 117   int all_routers_mcast;
 118   u32 seed;
 119   u64 randomizer;
 120   int ref_count;
 121   adj_index_t mcast_adj_index;
 122
 123   /* timing information */
 124 #define DEF_MAX_RADV_INTERVAL 200
 125 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
 126 #define DEF_CURR_HOP_LIMIT  64
 127 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
 128 #define MAX_DEF_RTR_LIFETIME   9000
 129
 130 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
 131 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
 132 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
 133 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
 134 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
 135
 136   f64 max_radv_interval;
 137   f64 min_radv_interval;
 138   f64 min_delay_between_radv;
 139   f64 max_delay_between_radv;
 140   f64 max_rtr_default_lifetime;
 141
 142   f64 last_radv_time;
 143   f64 last_multicast_time;
 144   f64 next_multicast_time;
 145
 146
 147   u32 initial_adverts_count;
 148   f64 initial_adverts_interval;
 149   u32 initial_adverts_sent;
 150
 151   /* stats */
 152   u32 n_advertisements_sent;
 153   u32 n_solicitations_rcvd;
 154   u32 n_solicitations_dropped;
 155
 156   /* Link local address to use (defaults to underlying physical for logical interfaces */
 157   ip6_address_t link_local_address;
 158
 159   /* router solicitations sending state */
 160   u8 keep_sending_rs;           /* when true then next fields are valid */
 161   icmp6_send_router_solicitation_params_t params;
 162   f64 sleep_interval;
 163   f64 due_time;
 164   u32 n_left;
 165   f64 start_time;
 166   vlib_buffer_t *buffer;
 167 } ip6_radv_t;
 168
 169 typedef struct
 170 {
 171   u32 next_index;
 172   uword node_index;
 173   uword type_opaque;
 174   uword data;
 175   /* Used for nd event notification only */
 176   void *data_callback;
 177   u32 pid;
 178 } pending_resolution_t;
 179
 180
 181 typedef struct
 182 {
 183   /* Hash tables mapping name to opcode. */
 184   uword *opcode_by_name;
 185
 186   /* lite beer "glean" adjacency handling */
 187   mhash_t pending_resolutions_by_address;
 188   pending_resolution_t *pending_resolutions;
 189
 190   /* Mac address change notification */
 191   mhash_t mac_changes_by_address;
 192   pending_resolution_t *mac_changes;
 193
 194   u32 *neighbor_input_next_index_by_hw_if_index;
 195
 196   ip6_neighbor_t *neighbor_pool;
 197
 198   mhash_t neighbor_index_by_key;
 199
 200   u32 *if_radv_pool_index_by_sw_if_index;
 201
 202   ip6_radv_t *if_radv_pool;
 203
 204   /* Neighbor attack mitigation */
 205   u32 limit_neighbor_cache_size;
 206   u32 neighbor_delete_rotor;
 207
 208   /* Wildcard nd report publisher */
 209   uword wc_ip6_nd_publisher_node;
 210   uword wc_ip6_nd_publisher_et;
 211
 212   /* Router advertisement report publisher */
 213   uword ip6_ra_publisher_node;
 214   uword ip6_ra_publisher_et;
 215 } ip6_neighbor_main_t;
 216
 217 /* ipv6 neighbor discovery - timer/event types */
 218 typedef enum
 219 {
 220   ICMP6_ND_EVENT_INIT,
 221 } ip6_icmp_neighbor_discovery_event_type_t;
 222
 223 typedef union
 224 {
 225   u32 add_del_swindex;
 226   struct
 227   {
 228     u32 up_down_swindex;
 229     u32 fib_index;
 230   } up_down_event;
 231 } ip6_icmp_neighbor_discovery_event_data_t;
 232
 233 static ip6_neighbor_main_t ip6_neighbor_main;
 234 ip6_neighbor_public_main_t ip6_neighbor_public_main;
 235 static ip6_address_t ip6a_zero; /* ip6 address 0 */
 236
 237 static void wc_nd_signal_report (wc_nd_report_t * r);
 238 static void ra_signal_report (ra_report_t * r);
 239
 240 ip6_address_t
 241 ip6_neighbor_get_link_local_address (u32 sw_if_index)
 242 {
 243   static ip6_address_t empty_address = { {0} };
 244   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 245   ip6_radv_t *radv_info;
 246   u32 ri = ~0;
 247
 248   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index)
 249     ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
 250   if (ri == ~0)
 251     {
 252       clib_warning ("IPv6 is not enabled for sw_if_index %d", sw_if_index);
 253       return empty_address;
 254     }
 255   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
 256   if (radv_info == NULL)
 257     {
 258       clib_warning ("Internal error");
 259       return empty_address;
 260     }
 261   return radv_info->link_local_address;
 262 }
 263
 264 /**
 265  * @brief publish wildcard arp event
 266  * @param sw_if_index The interface on which the ARP entires are acted
 267  */
 268 static int
 269 vnet_nd_wc_publish (u32 sw_if_index, u8 * mac, ip6_address_t * ip6)
 270 {
 271   wc_nd_report_t r = {
 272     .sw_if_index = sw_if_index,
 273     .ip6 = *ip6,
 274   };
 275   memcpy (r.mac, mac, sizeof r.mac);
 276
 277   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 278   vl_api_rpc_call_main_thread (wc_nd_signal_report, (u8 *) & r, sizeof r);
 279   return 0;
 280 }
 281
 282 static void
 283 wc_nd_signal_report (wc_nd_report_t * r)
 284 {
 285   vlib_main_t *vm = vlib_get_main ();
 286   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 287   uword ni = nm->wc_ip6_nd_publisher_node;
 288   uword et = nm->wc_ip6_nd_publisher_et;
 289
 290   if (ni == (uword) ~ 0)
 291     return;
 292   wc_nd_report_t *q =
 293     vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 294
 295   *q = *r;
 296 }
 297
 298 void
 299 wc_nd_set_publisher_node (uword node_index, uword event_type)
 300 {
 301   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 302   nm->wc_ip6_nd_publisher_node = node_index;
 303   nm->wc_ip6_nd_publisher_et = event_type;
 304 }
 305
 306 static int
 307 ra_publish (ra_report_t * r)
 308 {
 309   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 310   vl_api_rpc_call_main_thread (ra_signal_report, (u8 *) r, sizeof *r);
 311   return 0;
 312 }
 313
 314 static void
 315 ra_signal_report (ra_report_t * r)
 316 {
 317   vlib_main_t *vm = vlib_get_main ();
 318   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 319   uword ni = nm->ip6_ra_publisher_node;
 320   uword et = nm->ip6_ra_publisher_et;
 321
 322   if (ni == (uword) ~ 0)
 323     return;
 324   ra_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 325
 326   *q = *r;
 327 }
 328
 329 void
 330 ra_set_publisher_node (uword node_index, uword event_type)
 331 {
 332   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 333   nm->ip6_ra_publisher_node = node_index;
 334   nm->ip6_ra_publisher_et = event_type;
 335 }
 336
 337 static u8 *
 338 format_ip6_neighbor_ip6_entry (u8 * s, va_list * va)
 339 {
 340   vlib_main_t *vm = va_arg (*va, vlib_main_t *);
 341   ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *);
 342   vnet_main_t *vnm = vnet_get_main ();
 343   vnet_sw_interface_t *si;
 344   u8 *flags = 0;
 345
 346   if (!n)
 347     return format (s, "%=12s%=45s%=6s%=20s%=40s", "Time", "Address", "Flags",
 348                    "Link layer", "Interface");
 349
 350   if (n->flags & IP6_NEIGHBOR_FLAG_DYNAMIC)
 351     flags = format (flags, "D");
 352
 353   if (n->flags & IP6_NEIGHBOR_FLAG_STATIC)
 354     flags = format (flags, "S");
 355
 356   if (n->flags & IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY)
 357     flags = format (flags, "N");
 358
 359   si = vnet_get_sw_interface (vnm, n->key.sw_if_index);
 360   s = format (s, "%=12U%=45U%=6s%=20U%=40U",
 361               format_vlib_time, vm, n->time_last_updated,
 362               format_ip6_address, &n->key.ip6_address,
 363               flags ? (char *) flags : "",
 364               format_ethernet_address, n->link_layer_address,
 365               format_vnet_sw_interface_name, vnm, si);
 366
 367   vec_free (flags);
 368   return s;
 369 }
 370
 371 static void
 372 ip6_neighbor_adj_fib_remove (ip6_neighbor_t * n, u32 fib_index)
 373 {
 374   if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 375     {
 376       if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 377         {
 378           ip6_ll_prefix_t pfx = {
 379             .ilp_addr = n->key.ip6_address,
 380             .ilp_sw_if_index = n->key.sw_if_index,
 381           };
 382           ip6_ll_table_entry_delete (&pfx);
 383         }
 384       else
 385         {
 386           fib_prefix_t pfx = {
 387             .fp_len = 128,
 388             .fp_proto = FIB_PROTOCOL_IP6,
 389             .fp_addr.ip6 = n->key.ip6_address,
 390           };
 391           fib_table_entry_path_remove (fib_index,
 392                                        &pfx,
 393                                        FIB_SOURCE_ADJ,
 394                                        DPO_PROTO_IP6,
 395                                        &pfx.fp_addr,
 396                                        n->key.sw_if_index, ~0,
 397                                        1, FIB_ROUTE_PATH_FLAG_NONE);
 398         }
 399     }
 400 }
 401
 402 typedef struct
 403 {
 404   u8 is_add;
 405   u8 is_static;
 406   u8 is_no_fib_entry;
 407   u8 link_layer_address[6];
 408   u32 sw_if_index;
 409   ip6_address_t addr;
 410 } ip6_neighbor_set_unset_rpc_args_t;
 411
 412 static void ip6_neighbor_set_unset_rpc_callback
 413   (ip6_neighbor_set_unset_rpc_args_t * a);
 414
 415 static void set_unset_ip6_neighbor_rpc
 416   (vlib_main_t * vm,
 417    u32 sw_if_index,
 418    const ip6_address_t * a,
 419    const u8 * link_layer_address,
 420    int is_add, int is_static, int is_no_fib_entry)
 421 {
 422   ip6_neighbor_set_unset_rpc_args_t args;
 423   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 424
 425   args.sw_if_index = sw_if_index;
 426   args.is_add = is_add;
 427   args.is_static = is_static;
 428   args.is_no_fib_entry = is_no_fib_entry;
 429   clib_memcpy (&args.addr, a, sizeof (*a));
 430   if (NULL != link_layer_address)
 431     clib_memcpy (args.link_layer_address, link_layer_address, 6);
 432
 433   vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback,
 434                                (u8 *) & args, sizeof (args));
 435 }
 436
 437 static void
 438 ip6_nbr_probe (ip_adjacency_t * adj)
 439 {
 440   icmp6_neighbor_solicitation_header_t *h;
 441   vnet_main_t *vnm = vnet_get_main ();
 442   ip6_main_t *im = &ip6_main;
 443   ip_interface_address_t *ia;
 444   ip6_address_t *dst, *src;
 445   vnet_hw_interface_t *hi;
 446   vnet_sw_interface_t *si;
 447   vlib_buffer_t *b;
 448   int bogus_length;
 449   vlib_main_t *vm;
 450   u32 bi = 0;
 451
 452   vm = vlib_get_main ();
 453
 454   si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
 455   dst = &adj->sub_type.nbr.next_hop.ip6;
 456
 457   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 458     {
 459       return;
 460     }
 461   src = ip6_interface_address_matching_destination (im, dst,
 462                                                     adj->rewrite_header.
 463                                                     sw_if_index, &ia);
 464   if (!src)
 465     {
 466       return;
 467     }
 468
 469   h = vlib_packet_template_get_packet (vm,
 470                                        &im->discover_neighbor_packet_template,
 471                                        &bi);
 472   if (!h)
 473     return;
 474
 475   hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
 476
 477   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
 478   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
 479   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
 480   h->ip.src_address = src[0];
 481   h->neighbor.target_address = dst[0];
 482
 483   clib_memcpy (h->link_layer_option.ethernet_address,
 484                hi->hw_address, vec_len (hi->hw_address));
 485
 486   h->neighbor.icmp.checksum =
 487     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
 488   ASSERT (bogus_length == 0);
 489
 490   b = vlib_get_buffer (vm, bi);
 491   vnet_buffer (b)->sw_if_index[VLIB_RX] =
 492     vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
 493
 494   /* Add encapsulation string for software interface (e.g. ethernet header). */
 495   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
 496   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
 497
 498   {
 499     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
 500     u32 *to_next = vlib_frame_vector_args (f);
 501     to_next[0] = bi;
 502     f->n_vectors = 1;
 503     vlib_put_frame_to_node (vm, hi->output_node_index, f);
 504   }
 505 }
 506
 507 static void
 508 ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr)
 509 {
 510   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 511                           ethernet_build_rewrite (vnet_get_main (),
 512                                                   nbr->key.sw_if_index,
 513                                                   adj_get_link_type (ai),
 514                                                   nbr->link_layer_address));
 515 }
 516
 517 static void
 518 ip6_nd_mk_incomplete (adj_index_t ai)
 519 {
 520   ip_adjacency_t *adj = adj_get (ai);
 521
 522   adj_nbr_update_rewrite (ai,
 523                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 524                           ethernet_build_rewrite (vnet_get_main (),
 525                                                   adj->rewrite_header.
 526                                                   sw_if_index,
 527                                                   adj_get_link_type (ai),
 528                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 529 }
 530
 531 #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \
 532 {                                            \
 533     k.sw_if_index = sw_if_index;             \
 534     k.ip6_address = *addr;                   \
 535     k.pad = 0;                               \
 536 }
 537
 538 static ip6_neighbor_t *
 539 ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr)
 540 {
 541   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 542   ip6_neighbor_t *n = NULL;
 543   ip6_neighbor_key_t k;
 544   uword *p;
 545
 546   IP6_NBR_MK_KEY (k, sw_if_index, addr);
 547
 548   p = mhash_get (&nm->neighbor_index_by_key, &k);
 549   if (p)
 550     {
 551       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 552     }
 553
 554   return (n);
 555 }
 556
 557 static adj_walk_rc_t
 558 ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx)
 559 {
 560   ip6_neighbor_t *nbr = ctx;
 561
 562   ip6_nd_mk_complete (ai, nbr);
 563
 564   return (ADJ_WALK_RC_CONTINUE);
 565 }
 566
 567 static adj_walk_rc_t
 568 ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx)
 569 {
 570   ip6_nd_mk_incomplete (ai);
 571
 572   return (ADJ_WALK_RC_CONTINUE);
 573 }
 574
 575 static clib_error_t *
 576 ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
 577                                    u32 sw_if_index, u32 flags)
 578 {
 579   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 580   ip6_neighbor_t *n;
 581   u32 i, *to_delete = 0;
 582
 583   /* *INDENT-OFF* */
 584   pool_foreach (n, nm->neighbor_pool,
 585   ({
 586     if (n->key.sw_if_index == sw_if_index)
 587       vec_add1 (to_delete, n - nm->neighbor_pool);
 588   }));
 589   /* *INDENT-ON* */
 590
 591   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
 592     {
 593       for (i = 0; i < vec_len (to_delete); i++)
 594         {
 595           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 596           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 597                             ip6_nd_mk_complete_walk, n);
 598         }
 599     }
 600   else
 601     {
 602       for (i = 0; i < vec_len (to_delete); i++)
 603         {
 604           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 605           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 606                             ip6_nd_mk_incomplete_walk, NULL);
 607           if (n->flags & IP6_NEIGHBOR_FLAG_STATIC)
 608             continue;
 609           ip6_neighbor_adj_fib_remove (n,
 610                                        ip6_fib_table_get_index_for_sw_if_index
 611                                        (n->key.sw_if_index));
 612           mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 613           pool_put (nm->neighbor_pool, n);
 614         }
 615     }
 616
 617   vec_free (to_delete);
 618   return 0;
 619 }
 620
 621 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down);
 622
 623 void
 624 ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 625 {
 626   ip6_neighbor_t *nbr;
 627   ip_adjacency_t *adj;
 628
 629   adj = adj_get (ai);
 630
 631   nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6);
 632
 633   switch (adj->lookup_next_index)
 634     {
 635     case IP_LOOKUP_NEXT_GLEAN:
 636       adj_glean_update_rewrite (ai);
 637       break;
 638     case IP_LOOKUP_NEXT_ARP:
 639       if (NULL != nbr)
 640         {
 641           adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
 642                             ip6_nd_mk_complete_walk, nbr);
 643         }
 644       else
 645         {
 646           /*
 647            * no matching ND entry.
 648            * construct the rewrite required to for an ND packet, and stick
 649            * that in the adj's pipe to smoke.
 650            */
 651           adj_nbr_update_rewrite (ai,
 652                                   ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 653                                   ethernet_build_rewrite (vnm,
 654                                                           sw_if_index,
 655                                                           VNET_LINK_IP6,
 656                                                           VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 657
 658           /*
 659            * since the FIB has added this adj for a route, it makes sense it may
 660            * want to forward traffic sometime soon. Let's send a speculative ND.
 661            * just one. If we were to do periodically that wouldn't be bad either,
 662            * but that's more code than i'm prepared to write at this time for
 663            * relatively little reward.
 664            */
 665           ip6_nbr_probe (adj);
 666         }
 667       break;
 668     case IP_LOOKUP_NEXT_BCAST:
 669       adj_nbr_update_rewrite (ai,
 670                               ADJ_NBR_REWRITE_FLAG_COMPLETE,
 671                               ethernet_build_rewrite (vnm,
 672                                                       sw_if_index,
 673                                                       VNET_LINK_IP6,
 674                                                       VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 675       break;
 676     case IP_LOOKUP_NEXT_MCAST:
 677       {
 678         /*
 679          * Construct a partial rewrite from the known ethernet mcast dest MAC
 680          */
 681         u8 *rewrite;
 682         u8 offset;
 683
 684         rewrite = ethernet_build_rewrite (vnm,
 685                                           sw_if_index,
 686                                           adj->ia_link,
 687                                           ethernet_ip6_mcast_dst_addr ());
 688
 689         /*
 690          * Complete the remaining fields of the adj's rewrite to direct the
 691          * complete of the rewrite at switch time by copying in the IP
 692          * dst address's bytes.
 693          * Ofset is 2 bytes into the desintation address.
 694          */
 695         offset = vec_len (rewrite) - 2;
 696         adj_mcast_update_rewrite (ai, rewrite, offset);
 697
 698         break;
 699       }
 700     case IP_LOOKUP_NEXT_DROP:
 701     case IP_LOOKUP_NEXT_PUNT:
 702     case IP_LOOKUP_NEXT_LOCAL:
 703     case IP_LOOKUP_NEXT_REWRITE:
 704     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 705     case IP_LOOKUP_NEXT_MIDCHAIN:
 706     case IP_LOOKUP_NEXT_ICMP_ERROR:
 707     case IP_LOOKUP_N_NEXT:
 708       ASSERT (0);
 709       break;
 710     }
 711 }
 712
 713
 714 static void
 715 ip6_neighbor_adj_fib_add (ip6_neighbor_t * n, u32 fib_index)
 716 {
 717   if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 718     {
 719       ip6_ll_prefix_t pfx = {
 720         .ilp_addr = n->key.ip6_address,
 721         .ilp_sw_if_index = n->key.sw_if_index,
 722       };
 723       n->fib_entry_index =
 724         ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE);
 725     }
 726   else
 727     {
 728       fib_prefix_t pfx = {
 729         .fp_len = 128,
 730         .fp_proto = FIB_PROTOCOL_IP6,
 731         .fp_addr.ip6 = n->key.ip6_address,
 732       };
 733
 734       n->fib_entry_index =
 735         fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 736                                   FIB_ENTRY_FLAG_ATTACHED,
 737                                   DPO_PROTO_IP6, &pfx.fp_addr,
 738                                   n->key.sw_if_index, ~0, 1, NULL,
 739                                   FIB_ROUTE_PATH_FLAG_NONE);
 740     }
 741 }
 742
 743 static ip6_neighbor_t *
 744 force_reuse_neighbor_entry (void)
 745 {
 746   ip6_neighbor_t *n;
 747   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 748   u32 count = 0;
 749   u32 index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 750   if (index == ~0)              /* Try again from elt 0 */
 751     index = pool_next_index (nm->neighbor_pool, index);
 752
 753   /* Find a non-static random entry to free up for reuse */
 754   do
 755     {
 756       if ((count++ == 100) || (index == ~0))
 757         return NULL;            /* give up after 100 entries */
 758       n = pool_elt_at_index (nm->neighbor_pool, index);
 759       nm->neighbor_delete_rotor = index;
 760       index = pool_next_index (nm->neighbor_pool, index);
 761     }
 762   while (n->flags & IP6_NEIGHBOR_FLAG_STATIC);
 763
 764   /* Remove ARP entry from its interface and update fib */
 765   adj_nbr_walk_nh6 (n->key.sw_if_index,
 766                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 767   ip6_neighbor_adj_fib_remove
 768     (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 769   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 770
 771   return n;
 772 }
 773
 774 int
 775 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 776                                 u32 sw_if_index,
 777                                 const ip6_address_t * a,
 778                                 const u8 * link_layer_address,
 779                                 uword n_bytes_link_layer_address,
 780                                 int is_static, int is_no_fib_entry)
 781 {
 782   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 783   ip6_neighbor_key_t k;
 784   ip6_neighbor_t *n = 0;
 785   int make_new_nd_cache_entry = 1;
 786   uword *p;
 787   u32 next_index;
 788   pending_resolution_t *pr, *mc;
 789
 790   if (vlib_get_thread_index ())
 791     {
 792       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, link_layer_address,
 793                                   1 /* set new neighbor */ , is_static,
 794                                   is_no_fib_entry);
 795       return 0;
 796     }
 797
 798   k.sw_if_index = sw_if_index;
 799   k.ip6_address = a[0];
 800   k.pad = 0;
 801
 802   p = mhash_get (&nm->neighbor_index_by_key, &k);
 803   if (p)
 804     {
 805       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 806       /* Refuse to over-write static neighbor entry. */
 807       if (!is_static && (n->flags & IP6_NEIGHBOR_FLAG_STATIC))
 808         {
 809           /* if MAC address match, still check to send event */
 810           if (0 == memcmp (n->link_layer_address,
 811                            link_layer_address, n_bytes_link_layer_address))
 812             goto check_customers;
 813           return -2;
 814         }
 815       make_new_nd_cache_entry = 0;
 816     }
 817
 818   if (make_new_nd_cache_entry)
 819     {
 820       if (nm->limit_neighbor_cache_size &&
 821           pool_elts (nm->neighbor_pool) >= nm->limit_neighbor_cache_size)
 822         {
 823           n = force_reuse_neighbor_entry ();
 824           if (NULL == n)
 825             return -2;
 826         }
 827       else
 828         pool_get (nm->neighbor_pool, n);
 829
 830       mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
 831                  /* old value */ 0);
 832       n->key = k;
 833       n->fib_entry_index = FIB_NODE_INDEX_INVALID;
 834
 835       clib_memcpy (n->link_layer_address,
 836                    link_layer_address, n_bytes_link_layer_address);
 837
 838       /*
 839        * create the adj-fib. the entry in the FIB table for and to the peer.
 840        */
 841       if (!is_no_fib_entry)
 842         {
 843           ip6_neighbor_adj_fib_add
 844             (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 845         }
 846       else
 847         {
 848           n->flags |= IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 849         }
 850     }
 851   else
 852     {
 853       /*
 854        * prevent a DoS attack from the data-plane that
 855        * spams us with no-op updates to the MAC address
 856        */
 857       if (0 == memcmp (n->link_layer_address,
 858                        link_layer_address, n_bytes_link_layer_address))
 859         {
 860           n->time_last_updated = vlib_time_now (vm);
 861           goto check_customers;
 862         }
 863
 864       clib_memcpy (n->link_layer_address,
 865                    link_layer_address, n_bytes_link_layer_address);
 866     }
 867
 868   /* Update time stamp and flags. */
 869   n->time_last_updated = vlib_time_now (vm);
 870   if (is_static)
 871     {
 872       n->flags |= IP6_NEIGHBOR_FLAG_STATIC;
 873       n->flags &= ~IP6_NEIGHBOR_FLAG_DYNAMIC;
 874     }
 875   else
 876     {
 877       n->flags |= IP6_NEIGHBOR_FLAG_DYNAMIC;
 878       n->flags &= ~IP6_NEIGHBOR_FLAG_STATIC;
 879     }
 880
 881   adj_nbr_walk_nh6 (sw_if_index,
 882                     &n->key.ip6_address, ip6_nd_mk_complete_walk, n);
 883
 884 check_customers:
 885   /* Customer(s) waiting for this address to be resolved? */
 886   p = mhash_get (&nm->pending_resolutions_by_address, a);
 887   if (p)
 888     {
 889       next_index = p[0];
 890
 891       while (next_index != (u32) ~ 0)
 892         {
 893           pr = pool_elt_at_index (nm->pending_resolutions, next_index);
 894           vlib_process_signal_event (vm, pr->node_index,
 895                                      pr->type_opaque, pr->data);
 896           next_index = pr->next_index;
 897           pool_put (nm->pending_resolutions, pr);
 898         }
 899
 900       mhash_unset (&nm->pending_resolutions_by_address, (void *) a, 0);
 901     }
 902
 903   /* Customer(s) requesting ND event for this address? */
 904   p = mhash_get (&nm->mac_changes_by_address, a);
 905   if (p)
 906     {
 907       next_index = p[0];
 908
 909       while (next_index != (u32) ~ 0)
 910         {
 911           int (*fp) (u32, u8 *, u32, ip6_address_t *);
 912           int rv = 1;
 913           mc = pool_elt_at_index (nm->mac_changes, next_index);
 914           fp = mc->data_callback;
 915
 916           /* Call the user's data callback, return 1 to suppress dup events */
 917           if (fp)
 918             rv =
 919               (*fp) (mc->data, (u8 *) link_layer_address, sw_if_index,
 920                      &ip6a_zero);
 921           /*
 922            * Signal the resolver process, as long as the user
 923            * says they want to be notified
 924            */
 925           if (rv == 0)
 926             vlib_process_signal_event (vm, mc->node_index,
 927                                        mc->type_opaque, mc->data);
 928           next_index = mc->next_index;
 929         }
 930     }
 931
 932   return 0;
 933 }
 934
 935 int
 936 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 937                                   u32 sw_if_index, const ip6_address_t * a)
 938 {
 939   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 940   ip6_neighbor_key_t k;
 941   ip6_neighbor_t *n;
 942   uword *p;
 943   int rv = 0;
 944
 945   if (vlib_get_thread_index ())
 946     {
 947       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, NULL,
 948                                   0 /* unset */ , 0, 0);
 949       return 0;
 950     }
 951
 952   k.sw_if_index = sw_if_index;
 953   k.ip6_address = a[0];
 954   k.pad = 0;
 955
 956   p = mhash_get (&nm->neighbor_index_by_key, &k);
 957   if (p == 0)
 958     {
 959       rv = -1;
 960       goto out;
 961     }
 962
 963   n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 964
 965   adj_nbr_walk_nh6 (sw_if_index,
 966                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 967   ip6_neighbor_adj_fib_remove
 968     (n, ip6_fib_table_get_index_for_sw_if_index (sw_if_index));
 969
 970   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 971   pool_put (nm->neighbor_pool, n);
 972
 973 out:
 974   return rv;
 975 }
 976
 977 static void ip6_neighbor_set_unset_rpc_callback
 978   (ip6_neighbor_set_unset_rpc_args_t * a)
 979 {
 980   vlib_main_t *vm = vlib_get_main ();
 981   if (a->is_add)
 982     vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 983                                     a->link_layer_address, 6, a->is_static,
 984                                     a->is_no_fib_entry);
 985   else
 986     vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr);
 987 }
 988
 989 static int
 990 ip6_neighbor_sort (void *a1, void *a2)
 991 {
 992   vnet_main_t *vnm = vnet_get_main ();
 993   ip6_neighbor_t *n1 = a1, *n2 = a2;
 994   int cmp;
 995   cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index,
 996                                    n2->key.sw_if_index);
 997   if (!cmp)
 998     cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address);
 999   return cmp;
1000 }
1001
1002 ip6_neighbor_t *
1003 ip6_neighbors_pool (void)
1004 {
1005   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1006   return nm->neighbor_pool;
1007 }
1008
1009 ip6_neighbor_t *
1010 ip6_neighbors_entries (u32 sw_if_index)
1011 {
1012   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1013   ip6_neighbor_t *n, *ns = 0;
1014
1015   /* *INDENT-OFF* */
1016   pool_foreach (n, nm->neighbor_pool,
1017   ({
1018     if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index)
1019       continue;
1020     vec_add1 (ns, n[0]);
1021   }));
1022   /* *INDENT-ON* */
1023
1024   if (ns)
1025     vec_sort_with_function (ns, ip6_neighbor_sort);
1026   return ns;
1027 }
1028
1029 static clib_error_t *
1030 show_ip6_neighbors (vlib_main_t * vm,
1031                     unformat_input_t * input, vlib_cli_command_t * cmd)
1032 {
1033   vnet_main_t *vnm = vnet_get_main ();
1034   ip6_neighbor_t *n, *ns;
1035   clib_error_t *error = 0;
1036   u32 sw_if_index;
1037
1038   /* Filter entries by interface if given. */
1039   sw_if_index = ~0;
1040   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1041
1042   ns = ip6_neighbors_entries (sw_if_index);
1043   if (ns)
1044     {
1045       vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0);
1046       vec_foreach (n, ns)
1047       {
1048         vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n);
1049       }
1050       vec_free (ns);
1051     }
1052
1053   return error;
1054 }
1055
1056 /*?
1057  * This command is used to display the adjacent IPv6 hosts found via
1058  * neighbor discovery. Optionally, limit the output to the specified
1059  * interface.
1060  *
1061  * @cliexpar
1062  * Example of how to display the IPv6 neighbor adjacency table:
1063  * @cliexstart{show ip6 neighbors}
1064  *     Time           Address       Flags     Link layer                     Interface
1065  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
1066  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
1067  *     886.6654     ::1:1:c:0:9       S    02:fe:e4:45:27:5b                GigabitEthernet3/0/0
1068  * @cliexend
1069  * Example of how to display the IPv6 neighbor adjacency table for given interface:
1070  * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0}
1071  *     Time           Address       Flags     Link layer                     Interface
1072  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
1073  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
1074  * @cliexend
1075 ?*/
1076 /* *INDENT-OFF* */
1077 VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = {
1078   .path = "show ip6 neighbors",
1079   .function = show_ip6_neighbors,
1080   .short_help = "show ip6 neighbors [<interface>]",
1081 };
1082 /* *INDENT-ON* */
1083
1084 static clib_error_t *
1085 set_ip6_neighbor (vlib_main_t * vm,
1086                   unformat_input_t * input, vlib_cli_command_t * cmd)
1087 {
1088   vnet_main_t *vnm = vnet_get_main ();
1089   ip6_address_t addr;
1090   u8 mac_address[6];
1091   int addr_valid = 0;
1092   int is_del = 0;
1093   int is_static = 0;
1094   int is_no_fib_entry = 0;
1095   u32 sw_if_index;
1096
1097   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1098     {
1099       /* intfc, ip6-address, mac-address */
1100       if (unformat (input, "%U %U %U",
1101                     unformat_vnet_sw_interface, vnm, &sw_if_index,
1102                     unformat_ip6_address, &addr,
1103                     unformat_ethernet_address, mac_address))
1104         addr_valid = 1;
1105
1106       else if (unformat (input, "delete") || unformat (input, "del"))
1107         is_del = 1;
1108       else if (unformat (input, "static"))
1109         is_static = 1;
1110       else if (unformat (input, "no-fib-entry"))
1111         is_no_fib_entry = 1;
1112       else
1113         break;
1114     }
1115
1116   if (!addr_valid)
1117     return clib_error_return (0, "Missing interface, ip6 or hw address");
1118
1119   if (!is_del)
1120     vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr,
1121                                     mac_address, sizeof (mac_address),
1122                                     is_static, is_no_fib_entry);
1123   else
1124     vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr);
1125   return 0;
1126 }
1127
1128 /*?
1129  * This command is used to manually add an entry to the IPv6 neighbor
1130  * adjacency table. Optionally, the entry can be added as static. It is
1131  * also used to remove an entry from the table. Use the '<em>show ip6
1132  * neighbors</em>' command to display all learned and manually entered entries.
1133  *
1134  * @cliexpar
1135  * Example of how to add a static entry to the IPv6 neighbor adjacency table:
1136  * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static}
1137  * Example of how to delete an entry from the IPv6 neighbor adjacency table:
1138  * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b}
1139 ?*/
1140 /* *INDENT-OFF* */
1141 VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) =
1142 {
1143   .path = "set ip6 neighbor",
1144   .function = set_ip6_neighbor,
1145   .short_help = "set ip6 neighbor [del] <interface> <ip6-address> <mac-address> [static]",
1146 };
1147 /* *INDENT-ON* */
1148
1149 typedef enum
1150 {
1151   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
1152   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
1153   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
1154 } icmp6_neighbor_solicitation_or_advertisement_next_t;
1155
1156 static_always_inline uword
1157 icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm,
1158                                               vlib_node_runtime_t * node,
1159                                               vlib_frame_t * frame,
1160                                               uword is_solicitation)
1161 {
1162   vnet_main_t *vnm = vnet_get_main ();
1163   ip6_main_t *im = &ip6_main;
1164   uword n_packets = frame->n_vectors;
1165   u32 *from, *to_next;
1166   u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent;
1167   icmp6_neighbor_discovery_option_type_t option_type;
1168   vlib_node_runtime_t *error_node =
1169     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1170   int bogus_length;
1171
1172   from = vlib_frame_vector_args (frame);
1173   n_left_from = n_packets;
1174   next_index = node->cached_next_index;
1175
1176   if (node->flags & VLIB_NODE_FLAG_TRACE)
1177     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1178                                    /* stride */ 1,
1179                                    sizeof (icmp6_input_trace_t));
1180
1181   option_type =
1182     (is_solicitation
1183      ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address
1184      : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address);
1185   n_advertisements_sent = 0;
1186
1187   while (n_left_from > 0)
1188     {
1189       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1190
1191       while (n_left_from > 0 && n_left_to_next > 0)
1192         {
1193           vlib_buffer_t *p0;
1194           ip6_header_t *ip0;
1195           icmp6_neighbor_solicitation_or_advertisement_header_t *h0;
1196           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1197           u32 bi0, options_len0, sw_if_index0, next0, error0;
1198           u32 ip6_sadd_link_local, ip6_sadd_unspecified;
1199           int is_rewrite0;
1200           u32 ni0;
1201
1202           bi0 = to_next[0] = from[0];
1203
1204           from += 1;
1205           to_next += 1;
1206           n_left_from -= 1;
1207           n_left_to_next -= 1;
1208
1209           p0 = vlib_get_buffer (vm, bi0);
1210           ip0 = vlib_buffer_get_current (p0);
1211           h0 = ip6_next_header (ip0);
1212           options_len0 =
1213             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1214
1215           error0 = ICMP6_ERROR_NONE;
1216           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1217           ip6_sadd_link_local =
1218             ip6_address_is_link_local_unicast (&ip0->src_address);
1219           ip6_sadd_unspecified =
1220             ip6_address_is_unspecified (&ip0->src_address);
1221
1222           /* Check that source address is unspecified, link-local or else on-link. */
1223           if (!ip6_sadd_unspecified && !ip6_sadd_link_local)
1224             {
1225               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1226
1227               if (ADJ_INDEX_INVALID != src_adj_index0)
1228                 {
1229                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1230
1231                   /* Allow all realistic-looking rewrite adjacencies to pass */
1232                   ni0 = adj0->lookup_next_index;
1233                   is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) &&
1234                     (ni0 < IP6_LOOKUP_N_NEXT);
1235
1236                   error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0
1237                              || !is_rewrite0)
1238                             ?
1239                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK
1240                             : error0);
1241                 }
1242               else
1243                 {
1244                   error0 =
1245                     ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK;
1246                 }
1247             }
1248
1249           o0 = (void *) (h0 + 1);
1250           o0 = ((options_len0 == 8 && o0->header.type == option_type
1251                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1252
1253           /* If src address unspecified or link local, donot learn neighbor MAC */
1254           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1255                             !ip6_sadd_unspecified))
1256             {
1257               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1258                                               is_solicitation ?
1259                                               &ip0->src_address :
1260                                               &h0->target_address,
1261                                               o0->ethernet_address,
1262                                               sizeof (o0->ethernet_address),
1263                                               0, 0);
1264             }
1265
1266           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1267             {
1268               /* Check that target address is local to this router. */
1269               fib_node_index_t fei;
1270               u32 fib_index;
1271
1272               fib_index =
1273                 ip6_fib_table_get_index_for_sw_if_index (sw_if_index0);
1274
1275               if (~0 == fib_index)
1276                 {
1277                   error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1278                 }
1279               else
1280                 {
1281                   if (ip6_address_is_link_local_unicast (&h0->target_address))
1282                     {
1283                       fei = ip6_fib_table_lookup_exact_match
1284                         (ip6_ll_fib_get (sw_if_index0),
1285                          &h0->target_address, 128);
1286                     }
1287                   else
1288                     {
1289                       fei = ip6_fib_table_lookup_exact_match (fib_index,
1290                                                               &h0->target_address,
1291                                                               128);
1292                     }
1293
1294                   if (FIB_NODE_INDEX_INVALID == fei)
1295                     {
1296                       /* The target address is not in the FIB */
1297                       error0 =
1298                         ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1299                     }
1300                   else
1301                     {
1302                       if (FIB_ENTRY_FLAG_LOCAL &
1303                           fib_entry_get_flags_for_source (fei,
1304                                                           FIB_SOURCE_INTERFACE))
1305                         {
1306                           /* It's an address that belongs to one of our interfaces
1307                            * that's good. */
1308                         }
1309                       else
1310                         if (fib_entry_is_sourced
1311                             (fei, FIB_SOURCE_IP6_ND_PROXY) ||
1312                             fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND))
1313                         {
1314                           /* The address was added by IPv6 Proxy ND config.
1315                            * We should only respond to these if the NS arrived on
1316                            * the link that has a matching covering prefix */
1317                         }
1318                       else
1319                         {
1320                           error0 =
1321                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1322                         }
1323                     }
1324                 }
1325             }
1326
1327           if (is_solicitation)
1328             next0 = (error0 != ICMP6_ERROR_NONE
1329                      ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP
1330                      : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY);
1331           else
1332             {
1333               next0 = 0;
1334               error0 = error0 == ICMP6_ERROR_NONE ?
1335                 ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0;
1336             }
1337
1338           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1339             {
1340               vnet_sw_interface_t *sw_if0;
1341               ethernet_interface_t *eth_if0;
1342               ethernet_header_t *eth0;
1343
1344               /* dst address is either source address or the all-nodes mcast addr */
1345               if (!ip6_sadd_unspecified)
1346                 ip0->dst_address = ip0->src_address;
1347               else
1348                 ip6_set_reserved_multicast_address (&ip0->dst_address,
1349                                                     IP6_MULTICAST_SCOPE_link_local,
1350                                                     IP6_MULTICAST_GROUP_ID_all_hosts);
1351
1352               ip0->src_address = h0->target_address;
1353               ip0->hop_limit = 255;
1354               h0->icmp.type = ICMP6_neighbor_advertisement;
1355
1356               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1357               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1358               eth_if0 =
1359                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1360               if (eth_if0 && o0)
1361                 {
1362                   clib_memcpy (o0->ethernet_address, eth_if0->address, 6);
1363                   o0->header.type =
1364                     ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
1365                 }
1366
1367               h0->advertisement_flags = clib_host_to_net_u32
1368                 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
1369                  | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
1370
1371               h0->icmp.checksum = 0;
1372               h0->icmp.checksum =
1373                 ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1374                                                    &bogus_length);
1375               ASSERT (bogus_length == 0);
1376
1377               /* Reuse current MAC header, copy SMAC to DMAC and
1378                * interface MAC to SMAC */
1379               vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0));
1380               eth0 = vlib_buffer_get_current (p0);
1381               clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1382               if (eth_if0)
1383                 clib_memcpy (eth0->src_address, eth_if0->address, 6);
1384
1385               /* Setup input and output sw_if_index for packet */
1386               ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0);
1387               vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1388               vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1389                 vnet_main.local_interface_sw_if_index;
1390
1391               n_advertisements_sent++;
1392             }
1393
1394           p0->error = error_node->errors[error0];
1395
1396           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1397                                            to_next, n_left_to_next,
1398                                            bi0, next0);
1399         }
1400
1401       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1402     }
1403
1404   /* Account for advertisements sent. */
1405   vlib_error_count (vm, error_node->node_index,
1406                     ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX,
1407                     n_advertisements_sent);
1408
1409   return frame->n_vectors;
1410 }
1411
1412 /* for "syslogging" - use elog for now */
1413 #define foreach_log_level            \
1414   _ (DEBUG, "DEBUG")                         \
1415   _ (INFO, "INFORMATION")            \
1416   _ (NOTICE, "NOTICE")               \
1417   _ (WARNING, "WARNING")             \
1418   _ (ERR, "ERROR")                                    \
1419   _ (CRIT, "CRITICAL")                        \
1420   _ (ALERT, "ALERT")                          \
1421   _ (EMERG,  "EMERGENCY")
1422
1423 typedef enum
1424 {
1425 #define _(f,s) LOG_##f,
1426   foreach_log_level
1427 #undef _
1428 } log_level_t;
1429
1430 static char *log_level_strings[] = {
1431 #define _(f,s) s,
1432   foreach_log_level
1433 #undef _
1434 };
1435
1436 static int logmask = 1 << LOG_DEBUG;
1437
1438 static void
1439 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
1440 {
1441   /* just use elog for now */
1442   u8 *what;
1443   va_list va;
1444
1445   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
1446     return;
1447
1448   va_start (va, fmt);
1449   if (fmt)
1450     {
1451       what = va_format (0, fmt, &va);
1452
1453       ELOG_TYPE_DECLARE (e) =
1454       {
1455       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
1456       struct
1457       {
1458         u32 s[2];
1459       } *ed;
1460       ed = ELOG_DATA (&vm->elog_main, e);
1461       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
1462       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
1463     }
1464   va_end (va);
1465   return;
1466 }
1467
1468 clib_error_t *
1469 call_ip6_neighbor_callbacks (void *data,
1470                              _vnet_ip6_neighbor_function_list_elt_t * elt)
1471 {
1472   clib_error_t *error = 0;
1473
1474   while (elt)
1475     {
1476       error = elt->fp (data);
1477       if (error)
1478         return error;
1479       elt = elt->next_ip6_neighbor_function;
1480     }
1481
1482   return error;
1483 }
1484
1485 /* ipv6 neighbor discovery - router advertisements */
1486 typedef enum
1487 {
1488   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
1489   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
1490   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
1491   ICMP6_ROUTER_SOLICITATION_N_NEXT,
1492 } icmp6_router_solicitation_or_advertisement_next_t;
1493
1494 static_always_inline uword
1495 icmp6_router_solicitation (vlib_main_t * vm,
1496                            vlib_node_runtime_t * node, vlib_frame_t * frame)
1497 {
1498   vnet_main_t *vnm = vnet_get_main ();
1499   ip6_main_t *im = &ip6_main;
1500   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1501   uword n_packets = frame->n_vectors;
1502   u32 *from, *to_next;
1503   u32 n_left_from, n_left_to_next, next_index;
1504   u32 n_advertisements_sent = 0;
1505   int bogus_length;
1506
1507   icmp6_neighbor_discovery_option_type_t option_type;
1508
1509   vlib_node_runtime_t *error_node =
1510     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1511
1512   from = vlib_frame_vector_args (frame);
1513   n_left_from = n_packets;
1514   next_index = node->cached_next_index;
1515
1516   if (node->flags & VLIB_NODE_FLAG_TRACE)
1517     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1518                                    /* stride */ 1,
1519                                    sizeof (icmp6_input_trace_t));
1520
1521   /* source may append his LL address */
1522   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1523
1524   while (n_left_from > 0)
1525     {
1526       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1527
1528       while (n_left_from > 0 && n_left_to_next > 0)
1529         {
1530           vlib_buffer_t *p0;
1531           ip6_header_t *ip0;
1532           ip6_radv_t *radv_info = 0;
1533
1534           icmp6_neighbor_discovery_header_t *h0;
1535           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1536
1537           u32 bi0, options_len0, sw_if_index0, next0, error0;
1538           u32 is_solicitation = 1, is_dropped = 0;
1539           u32 is_unspecified, is_link_local;
1540
1541           bi0 = to_next[0] = from[0];
1542
1543           from += 1;
1544           to_next += 1;
1545           n_left_from -= 1;
1546           n_left_to_next -= 1;
1547
1548           p0 = vlib_get_buffer (vm, bi0);
1549           ip0 = vlib_buffer_get_current (p0);
1550           h0 = ip6_next_header (ip0);
1551           options_len0 =
1552             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1553           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
1554           is_link_local =
1555             ip6_address_is_link_local_unicast (&ip0->src_address);
1556
1557           error0 = ICMP6_ERROR_NONE;
1558           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1559
1560           /* check if solicitation  (not from nd_timer node) */
1561           if (ip6_address_is_unspecified (&ip0->dst_address))
1562             is_solicitation = 0;
1563
1564           /* Check that source address is unspecified, link-local or else on-link. */
1565           if (!is_unspecified && !is_link_local)
1566             {
1567               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1568
1569               if (ADJ_INDEX_INVALID != src_adj_index0)
1570                 {
1571                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1572
1573                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
1574                             ?
1575                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
1576                             : error0);
1577                 }
1578               else
1579                 {
1580                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
1581                 }
1582             }
1583
1584           /* check for source LL option and process */
1585           o0 = (void *) (h0 + 1);
1586           o0 = ((options_len0 == 8
1587                  && o0->header.type == option_type
1588                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1589
1590           /* if src address unspecified IGNORE any options */
1591           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1592                             !is_unspecified && !is_link_local))
1593             {
1594               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1595                                               &ip0->src_address,
1596                                               o0->ethernet_address,
1597                                               sizeof (o0->ethernet_address),
1598                                               0, 0);
1599             }
1600
1601           /* default is to drop */
1602           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1603
1604           if (error0 == ICMP6_ERROR_NONE)
1605             {
1606               vnet_sw_interface_t *sw_if0;
1607               ethernet_interface_t *eth_if0;
1608               u32 adj_index0;
1609
1610               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1611               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1612               eth_if0 =
1613                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1614
1615               /* only support ethernet interface type for now */
1616               error0 =
1617                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1618                 : error0;
1619
1620               if (error0 == ICMP6_ERROR_NONE)
1621                 {
1622                   u32 ri;
1623
1624                   /* adjust the sizeof the buffer to just include the ipv6 header */
1625                   p0->current_length -=
1626                     (options_len0 +
1627                      sizeof (icmp6_neighbor_discovery_header_t));
1628
1629                   /* look up the radv_t information for this interface */
1630                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1631                       sw_if_index0)
1632                     {
1633                       ri =
1634                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1635
1636                       if (ri != ~0)
1637                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1638                     }
1639
1640                   error0 =
1641                     ((!radv_info) ?
1642                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1643                      error0);
1644
1645                   if (error0 == ICMP6_ERROR_NONE)
1646                     {
1647                       f64 now = vlib_time_now (vm);
1648
1649                       /* for solicited adverts - need to rate limit */
1650                       if (is_solicitation)
1651                         {
1652                           if (0 != radv_info->last_radv_time &&
1653                               (now - radv_info->last_radv_time) <
1654                               MIN_DELAY_BETWEEN_RAS)
1655                             is_dropped = 1;
1656                           else
1657                             radv_info->last_radv_time = now;
1658                         }
1659
1660                       /* send now  */
1661                       icmp6_router_advertisement_header_t rh;
1662
1663                       rh.icmp.type = ICMP6_router_advertisement;
1664                       rh.icmp.code = 0;
1665                       rh.icmp.checksum = 0;
1666
1667                       rh.current_hop_limit = radv_info->curr_hop_limit;
1668                       rh.router_lifetime_in_sec =
1669                         clib_host_to_net_u16
1670                         (radv_info->adv_router_lifetime_in_sec);
1671                       rh.
1672                         time_in_msec_between_retransmitted_neighbor_solicitations
1673                         =
1674                         clib_host_to_net_u32 (radv_info->
1675                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
1676                       rh.neighbor_reachable_time_in_msec =
1677                         clib_host_to_net_u32 (radv_info->
1678                                               adv_neighbor_reachable_time_in_msec);
1679
1680                       rh.flags =
1681                         (radv_info->adv_managed_flag) ?
1682                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
1683                         0;
1684                       rh.flags |=
1685                         ((radv_info->adv_other_flag) ?
1686                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
1687                          0);
1688
1689
1690                       u16 payload_length =
1691                         sizeof (icmp6_router_advertisement_header_t);
1692
1693                       if (vlib_buffer_add_data
1694                           (vm, &bi0, (void *) &rh,
1695                            sizeof (icmp6_router_advertisement_header_t)))
1696                         {
1697                           /* buffer allocation failed, drop the pkt */
1698                           error0 = ICMP6_ERROR_ALLOC_FAILURE;
1699                           goto drop0;
1700                         }
1701
1702                       if (radv_info->adv_link_layer_address)
1703                         {
1704                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1705                             h;
1706
1707                           h.header.type =
1708                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1709                           h.header.n_data_u64s = 1;
1710
1711                           /* copy ll address */
1712                           clib_memcpy (&h.ethernet_address[0],
1713                                        eth_if0->address, 6);
1714
1715                           if (vlib_buffer_add_data
1716                               (vm, &bi0, (void *) &h,
1717                                sizeof
1718                                (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
1719                             {
1720                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1721                               goto drop0;
1722                             }
1723
1724                           payload_length +=
1725                             sizeof
1726                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1727                         }
1728
1729                       /* add MTU option */
1730                       if (radv_info->adv_link_mtu)
1731                         {
1732                           icmp6_neighbor_discovery_mtu_option_t h;
1733
1734                           h.unused = 0;
1735                           h.mtu =
1736                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1737                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1738                           h.header.n_data_u64s = 1;
1739
1740                           payload_length +=
1741                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1742
1743                           if (vlib_buffer_add_data
1744                               (vm, &bi0, (void *) &h,
1745                                sizeof
1746                                (icmp6_neighbor_discovery_mtu_option_t)))
1747                             {
1748                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1749                               goto drop0;
1750                             }
1751                         }
1752
1753                       /* add advertised prefix options  */
1754                       ip6_radv_prefix_t *pr_info;
1755
1756                       /* *INDENT-OFF* */
1757                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1758                       ({
1759                         if(pr_info->enabled &&
1760                            (!pr_info->decrement_lifetime_flag
1761                             || (pr_info->pref_lifetime_expires >0)))
1762                           {
1763                             /* advertise this prefix */
1764                             icmp6_neighbor_discovery_prefix_information_option_t h;
1765
1766                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1767                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1768
1769                             h.dst_address_length  = pr_info->prefix_len;
1770
1771                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1772                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1773
1774                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1775                               {
1776                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1777                                 h.preferred_time  = 0;
1778                               }
1779                             else
1780                               {
1781                                 if(pr_info->decrement_lifetime_flag)
1782                                   {
1783                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1784                                       (pr_info->valid_lifetime_expires  - now) : 0;
1785
1786                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1787                                       (pr_info->pref_lifetime_expires  - now) : 0;
1788                                   }
1789
1790                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1791                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1792                               }
1793                             h.unused  = 0;
1794
1795                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1796
1797                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1798
1799                             if (vlib_buffer_add_data
1800                                 (vm, &bi0, (void *)&h,
1801                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
1802                               {
1803                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
1804                                 goto drop0;
1805                               }
1806
1807                           }
1808                       }));
1809                       /* *INDENT-ON* */
1810
1811                       /* add additional options before here */
1812
1813                       /* finish building the router advertisement... */
1814                       if (!is_unspecified && radv_info->send_unicast)
1815                         {
1816                           ip0->dst_address = ip0->src_address;
1817                         }
1818                       else
1819                         {
1820                           /* target address is all-nodes mcast addr */
1821                           ip6_set_reserved_multicast_address
1822                             (&ip0->dst_address,
1823                              IP6_MULTICAST_SCOPE_link_local,
1824                              IP6_MULTICAST_GROUP_ID_all_hosts);
1825                         }
1826
1827                       /* source address MUST be the link-local address */
1828                       ip0->src_address = radv_info->link_local_address;
1829
1830                       ip0->hop_limit = 255;
1831                       ip0->payload_length =
1832                         clib_host_to_net_u16 (payload_length);
1833
1834                       icmp6_router_advertisement_header_t *rh0 =
1835                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1836                       rh0->icmp.checksum =
1837                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1838                                                            &bogus_length);
1839                       ASSERT (bogus_length == 0);
1840
1841                       /* setup output if and adjacency */
1842                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1843                         vnet_main.local_interface_sw_if_index;
1844
1845                       if (is_solicitation)
1846                         {
1847                           ethernet_header_t *eth0;
1848                           /* Reuse current MAC header, copy SMAC to DMAC and
1849                            * interface MAC to SMAC */
1850                           vlib_buffer_reset (p0);
1851                           eth0 = vlib_buffer_get_current (p0);
1852                           clib_memcpy (eth0->dst_address, eth0->src_address,
1853                                        6);
1854                           clib_memcpy (eth0->src_address, eth_if0->address,
1855                                        6);
1856                           next0 =
1857                             is_dropped ? next0 :
1858                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1859                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1860                             sw_if_index0;
1861                         }
1862                       else
1863                         {
1864                           adj_index0 = radv_info->mcast_adj_index;
1865                           if (adj_index0 == 0)
1866                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1867                           else
1868                             {
1869                               next0 =
1870                                 is_dropped ? next0 :
1871                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1872                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1873                                 adj_index0;
1874                             }
1875                         }
1876                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1877
1878                       radv_info->n_solicitations_dropped += is_dropped;
1879                       radv_info->n_solicitations_rcvd += is_solicitation;
1880
1881                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1882                         {
1883                           radv_info->n_advertisements_sent++;
1884                           n_advertisements_sent++;
1885                         }
1886                     }
1887                 }
1888             }
1889
1890         drop0:
1891           p0->error = error_node->errors[error0];
1892
1893           if (error0 != ICMP6_ERROR_NONE)
1894             vlib_error_count (vm, error_node->node_index, error0, 1);
1895
1896           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1897                                            to_next, n_left_to_next,
1898                                            bi0, next0);
1899
1900         }
1901
1902       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1903     }
1904
1905   /* Account for router advertisements sent. */
1906   vlib_error_count (vm, error_node->node_index,
1907                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1908                     n_advertisements_sent);
1909
1910   return frame->n_vectors;
1911 }
1912
1913  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1914 static_always_inline uword
1915 icmp6_router_advertisement (vlib_main_t * vm,
1916                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1917 {
1918   vnet_main_t *vnm = vnet_get_main ();
1919   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1920   uword n_packets = frame->n_vectors;
1921   u32 *from, *to_next;
1922   u32 n_left_from, n_left_to_next, next_index;
1923   u32 n_advertisements_rcvd = 0;
1924
1925   vlib_node_runtime_t *error_node =
1926     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1927
1928   from = vlib_frame_vector_args (frame);
1929   n_left_from = n_packets;
1930   next_index = node->cached_next_index;
1931
1932   if (node->flags & VLIB_NODE_FLAG_TRACE)
1933     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1934                                    /* stride */ 1,
1935                                    sizeof (icmp6_input_trace_t));
1936
1937   while (n_left_from > 0)
1938     {
1939       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1940
1941       while (n_left_from > 0 && n_left_to_next > 0)
1942         {
1943           vlib_buffer_t *p0;
1944           ip6_header_t *ip0;
1945           ip6_radv_t *radv_info = 0;
1946           icmp6_router_advertisement_header_t *h0;
1947           u32 bi0, options_len0, sw_if_index0, next0, error0;
1948
1949           bi0 = to_next[0] = from[0];
1950
1951           from += 1;
1952           to_next += 1;
1953           n_left_from -= 1;
1954           n_left_to_next -= 1;
1955
1956           p0 = vlib_get_buffer (vm, bi0);
1957           ip0 = vlib_buffer_get_current (p0);
1958           h0 = ip6_next_header (ip0);
1959           options_len0 =
1960             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1961
1962           error0 = ICMP6_ERROR_NONE;
1963           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1964
1965           /* Check that source address is link-local */
1966           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1967             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1968
1969           /* default is to drop */
1970           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1971
1972           n_advertisements_rcvd++;
1973
1974           if (error0 == ICMP6_ERROR_NONE)
1975             {
1976               vnet_sw_interface_t *sw_if0;
1977               ethernet_interface_t *eth_if0;
1978
1979               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1980               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1981               eth_if0 =
1982                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1983
1984               /* only support ethernet interface type for now */
1985               error0 =
1986                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1987                 : error0;
1988
1989               if (error0 == ICMP6_ERROR_NONE)
1990                 {
1991                   u32 ri;
1992
1993                   /* look up the radv_t information for this interface */
1994                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1995                       sw_if_index0)
1996                     {
1997                       ri =
1998                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1999
2000                       if (ri != ~0)
2001                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2002                     }
2003
2004                   error0 =
2005                     ((!radv_info) ?
2006                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
2007                      error0);
2008
2009                   if (error0 == ICMP6_ERROR_NONE)
2010                     {
2011                       radv_info->keep_sending_rs = 0;
2012
2013                       ra_report_t r;
2014
2015                       r.sw_if_index = sw_if_index0;
2016                       memcpy (r.router_address, &ip0->src_address, 16);
2017                       r.current_hop_limit = h0->current_hop_limit;
2018                       r.flags = h0->flags;
2019                       r.router_lifetime_in_sec =
2020                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
2021                       r.neighbor_reachable_time_in_msec =
2022                         clib_net_to_host_u32
2023                         (h0->neighbor_reachable_time_in_msec);
2024                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
2025                       r.prefixes = 0;
2026
2027                       /* validate advertised information */
2028                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
2029                           && (h0->current_hop_limit !=
2030                               radv_info->curr_hop_limit))
2031                         {
2032                           ip6_neighbor_syslog (vm, LOG_WARNING,
2033                                                "our AdvCurHopLimit on %U doesn't agree with %U",
2034                                                format_vnet_sw_if_index_name,
2035                                                vnm, sw_if_index0,
2036                                                format_ip6_address,
2037                                                &ip0->src_address);
2038                         }
2039
2040                       if ((h0->flags &
2041                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
2042                           != radv_info->adv_managed_flag)
2043                         {
2044                           ip6_neighbor_syslog (vm, LOG_WARNING,
2045                                                "our AdvManagedFlag on %U doesn't agree with %U",
2046                                                format_vnet_sw_if_index_name,
2047                                                vnm, sw_if_index0,
2048                                                format_ip6_address,
2049                                                &ip0->src_address);
2050                         }
2051
2052                       if ((h0->flags &
2053                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
2054                           != radv_info->adv_other_flag)
2055                         {
2056                           ip6_neighbor_syslog (vm, LOG_WARNING,
2057                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
2058                                                format_vnet_sw_if_index_name,
2059                                                vnm, sw_if_index0,
2060                                                format_ip6_address,
2061                                                &ip0->src_address);
2062                         }
2063
2064                       if ((h0->
2065                            time_in_msec_between_retransmitted_neighbor_solicitations
2066                            && radv_info->
2067                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
2068                           && (h0->
2069                               time_in_msec_between_retransmitted_neighbor_solicitations
2070                               !=
2071                               clib_host_to_net_u32 (radv_info->
2072                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
2073                         {
2074                           ip6_neighbor_syslog (vm, LOG_WARNING,
2075                                                "our AdvRetransTimer on %U doesn't agree with %U",
2076                                                format_vnet_sw_if_index_name,
2077                                                vnm, sw_if_index0,
2078                                                format_ip6_address,
2079                                                &ip0->src_address);
2080                         }
2081
2082                       if ((h0->neighbor_reachable_time_in_msec &&
2083                            radv_info->adv_neighbor_reachable_time_in_msec) &&
2084                           (h0->neighbor_reachable_time_in_msec !=
2085                            clib_host_to_net_u32
2086                            (radv_info->adv_neighbor_reachable_time_in_msec)))
2087                         {
2088                           ip6_neighbor_syslog (vm, LOG_WARNING,
2089                                                "our AdvReachableTime on %U doesn't agree with %U",
2090                                                format_vnet_sw_if_index_name,
2091                                                vnm, sw_if_index0,
2092                                                format_ip6_address,
2093                                                &ip0->src_address);
2094                         }
2095
2096                       /* check for MTU or prefix options or .. */
2097                       u8 *opt_hdr = (u8 *) (h0 + 1);
2098                       while (options_len0 > 0)
2099                         {
2100                           icmp6_neighbor_discovery_option_header_t *o0 =
2101                             (icmp6_neighbor_discovery_option_header_t *)
2102                             opt_hdr;
2103                           int opt_len = o0->n_data_u64s << 3;
2104                           icmp6_neighbor_discovery_option_type_t option_type =
2105                             o0->type;
2106
2107                           if (options_len0 < 2)
2108                             {
2109                               ip6_neighbor_syslog (vm, LOG_ERR,
2110                                                    "malformed RA packet on %U from %U",
2111                                                    format_vnet_sw_if_index_name,
2112                                                    vnm, sw_if_index0,
2113                                                    format_ip6_address,
2114                                                    &ip0->src_address);
2115                               break;
2116                             }
2117
2118                           if (opt_len == 0)
2119                             {
2120                               ip6_neighbor_syslog (vm, LOG_ERR,
2121                                                    " zero length option in RA on %U from %U",
2122                                                    format_vnet_sw_if_index_name,
2123                                                    vnm, sw_if_index0,
2124                                                    format_ip6_address,
2125                                                    &ip0->src_address);
2126                               break;
2127                             }
2128                           else if (opt_len > options_len0)
2129                             {
2130                               ip6_neighbor_syslog (vm, LOG_ERR,
2131                                                    "option length in RA packet  greater than total length on %U from %U",
2132                                                    format_vnet_sw_if_index_name,
2133                                                    vnm, sw_if_index0,
2134                                                    format_ip6_address,
2135                                                    &ip0->src_address);
2136                               break;
2137                             }
2138
2139                           options_len0 -= opt_len;
2140                           opt_hdr += opt_len;
2141
2142                           switch (option_type)
2143                             {
2144                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
2145                               {
2146                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2147                                   * h =
2148                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2149                                    *) (o0);
2150
2151                                 if (opt_len < sizeof (*h))
2152                                   break;
2153
2154                                 memcpy (r.slla, h->ethernet_address, 6);
2155                               }
2156                               break;
2157
2158                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
2159                               {
2160                                 icmp6_neighbor_discovery_mtu_option_t *h =
2161                                   (icmp6_neighbor_discovery_mtu_option_t
2162                                    *) (o0);
2163
2164                                 if (opt_len < sizeof (*h))
2165                                   break;
2166
2167                                 r.mtu = clib_net_to_host_u32 (h->mtu);
2168
2169                                 if ((h->mtu && radv_info->adv_link_mtu) &&
2170                                     (h->mtu !=
2171                                      clib_host_to_net_u32
2172                                      (radv_info->adv_link_mtu)))
2173                                   {
2174                                     ip6_neighbor_syslog (vm, LOG_WARNING,
2175                                                          "our AdvLinkMTU on %U doesn't agree with %U",
2176                                                          format_vnet_sw_if_index_name,
2177                                                          vnm, sw_if_index0,
2178                                                          format_ip6_address,
2179                                                          &ip0->src_address);
2180                                   }
2181                               }
2182                               break;
2183
2184                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
2185                               {
2186                                 icmp6_neighbor_discovery_prefix_information_option_t
2187                                   * h =
2188                                   (icmp6_neighbor_discovery_prefix_information_option_t
2189                                    *) (o0);
2190
2191                                 /* validate advertised prefix options  */
2192                                 ip6_radv_prefix_t *pr_info;
2193                                 u32 preferred, valid;
2194
2195                                 if (opt_len < sizeof (*h))
2196                                   break;
2197
2198                                 vec_validate (r.prefixes,
2199                                               vec_len (r.prefixes));
2200                                 ra_report_prefix_info_t *prefix =
2201                                   vec_elt_at_index (r.prefixes,
2202                                                     vec_len (r.prefixes) - 1);
2203
2204                                 preferred =
2205                                   clib_net_to_host_u32 (h->preferred_time);
2206                                 valid = clib_net_to_host_u32 (h->valid_time);
2207
2208                                 prefix->preferred_time = preferred;
2209                                 prefix->valid_time = valid;
2210                                 prefix->flags = h->flags & 0xc0;
2211                                 prefix->dst_address_length =
2212                                   h->dst_address_length;
2213                                 prefix->dst_address = h->dst_address;
2214
2215                                 /* look for matching prefix - if we our advertising it, it better be consistant */
2216                                 /* *INDENT-OFF* */
2217                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
2218                                 ({
2219
2220                                   ip6_address_t mask;
2221                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
2222
2223                                   if(pr_info->enabled &&
2224                                      (pr_info->prefix_len == h->dst_address_length) &&
2225                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
2226                                     {
2227                                       /* found it */
2228                                       if(!pr_info->decrement_lifetime_flag &&
2229                                          valid != pr_info->adv_valid_lifetime_in_secs)
2230                                         {
2231                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2232                                                               "our ADV validlifetime 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                                       if(!pr_info->decrement_lifetime_flag &&
2237                                          preferred != pr_info->adv_pref_lifetime_in_secs)
2238                                         {
2239                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2240                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
2241                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2242                                                               format_ip6_address, &h->dst_address);
2243                                         }
2244                                     }
2245                                   break;
2246                                 }));
2247                                 /* *INDENT-ON* */
2248                                 break;
2249                               }
2250                             default:
2251                               /* skip this one */
2252                               break;
2253                             }
2254                         }
2255                       ra_publish (&r);
2256                     }
2257                 }
2258             }
2259
2260           p0->error = error_node->errors[error0];
2261
2262           if (error0 != ICMP6_ERROR_NONE)
2263             vlib_error_count (vm, error_node->node_index, error0, 1);
2264
2265           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2266                                            to_next, n_left_to_next,
2267                                            bi0, next0);
2268         }
2269
2270       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2271     }
2272
2273   /* Account for router advertisements received. */
2274   vlib_error_count (vm, error_node->node_index,
2275                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2276                     n_advertisements_rcvd);
2277
2278   return frame->n_vectors;
2279 }
2280
2281 static inline f64
2282 random_f64_from_to (f64 from, f64 to)
2283 {
2284   static u32 seed = 0;
2285   static u8 seed_set = 0;
2286   if (!seed_set)
2287     {
2288       seed = random_default_seed ();
2289       seed_set = 1;
2290     }
2291   return random_f64 (&seed) * (to - from) + from;
2292 }
2293
2294 static inline u8
2295 get_mac_address (u32 sw_if_index, u8 * address)
2296 {
2297   vnet_main_t *vnm = vnet_get_main ();
2298   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
2299   if (!hw_if->hw_address)
2300     return 1;
2301   clib_memcpy (address, hw_if->hw_address, 6);
2302   return 0;
2303 }
2304
2305 static inline vlib_buffer_t *
2306 create_buffer_for_rs (vlib_main_t * vm, ip6_radv_t * radv_info)
2307 {
2308   u32 bi0;
2309   vlib_buffer_t *p0;
2310   vlib_buffer_free_list_t *fl;
2311   icmp6_router_solicitation_header_t *rh;
2312   u16 payload_length;
2313   int bogus_length;
2314   u32 sw_if_index;
2315
2316   sw_if_index = radv_info->sw_if_index;
2317
2318   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
2319     {
2320       clib_warning ("buffer allocation failure");
2321       return 0;
2322     }
2323
2324   p0 = vlib_get_buffer (vm, bi0);
2325   fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2326   vlib_buffer_init_for_free_list (p0, fl);
2327   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
2328   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2329
2330   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
2331   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
2332
2333   vnet_buffer (p0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2334
2335   rh = vlib_buffer_get_current (p0);
2336   p0->current_length = sizeof (*rh);
2337
2338   rh->neighbor.icmp.type = ICMP6_router_solicitation;
2339   rh->neighbor.icmp.code = 0;
2340   rh->neighbor.icmp.checksum = 0;
2341   rh->neighbor.reserved_must_be_zero = 0;
2342
2343   rh->link_layer_option.header.type =
2344     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2345   if (0 != get_mac_address (sw_if_index,
2346                             rh->link_layer_option.ethernet_address))
2347     {
2348       clib_warning ("interface with sw_if_index %u has no mac address",
2349                     sw_if_index);
2350       vlib_buffer_free (vm, &bi0, 1);
2351       return 0;
2352     }
2353   rh->link_layer_option.header.n_data_u64s = 1;
2354
2355   payload_length = sizeof (rh->neighbor) + sizeof (u64);
2356
2357   rh->ip.ip_version_traffic_class_and_flow_label =
2358     clib_host_to_net_u32 (0x6 << 28);
2359   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
2360   rh->ip.protocol = IP_PROTOCOL_ICMP6;
2361   rh->ip.hop_limit = 255;
2362   rh->ip.src_address = radv_info->link_local_address;
2363   /* set address ff02::2 */
2364   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
2365   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
2366
2367   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
2368                                                                   &rh->ip,
2369                                                                   &bogus_length);
2370
2371   return p0;
2372 }
2373
2374 static inline void
2375 stop_sending_rs (vlib_main_t * vm, ip6_radv_t * ra)
2376 {
2377   u32 bi0;
2378
2379   ra->keep_sending_rs = 0;
2380   if (ra->buffer)
2381     {
2382       bi0 = vlib_get_buffer_index (vm, ra->buffer);
2383       vlib_buffer_free (vm, &bi0, 1);
2384       ra->buffer = 0;
2385     }
2386 }
2387
2388 static inline bool
2389 check_send_rs (vlib_main_t * vm, ip6_radv_t * radv_info, f64 current_time,
2390                f64 * due_time)
2391 {
2392   vlib_buffer_t *p0;
2393   vlib_frame_t *f;
2394   u32 *to_next;
2395   u32 next_index;
2396   vlib_buffer_t *c0;
2397   u32 ci0;
2398
2399   icmp6_send_router_solicitation_params_t *params;
2400
2401   if (!radv_info->keep_sending_rs)
2402     return false;
2403
2404   params = &radv_info->params;
2405
2406   if (radv_info->due_time > current_time)
2407     {
2408       *due_time = radv_info->due_time;
2409       return true;
2410     }
2411
2412   p0 = radv_info->buffer;
2413
2414   next_index = ip6_rewrite_mcast_node.index;
2415
2416   c0 = vlib_buffer_copy (vm, p0);
2417   ci0 = vlib_get_buffer_index (vm, c0);
2418
2419   f = vlib_get_frame_to_node (vm, next_index);
2420   to_next = vlib_frame_vector_args (f);
2421   to_next[0] = ci0;
2422   f->n_vectors = 1;
2423   vlib_put_frame_to_node (vm, next_index, f);
2424
2425   if (params->mrc != 0 && --radv_info->n_left == 0)
2426     stop_sending_rs (vm, radv_info);
2427   else
2428     {
2429       radv_info->sleep_interval =
2430         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
2431       if (radv_info->sleep_interval > params->mrt)
2432         radv_info->sleep_interval =
2433           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
2434
2435       radv_info->due_time = current_time + radv_info->sleep_interval;
2436
2437       if (params->mrd != 0
2438           && current_time > radv_info->start_time + params->mrd)
2439         stop_sending_rs (vm, radv_info);
2440       else
2441         *due_time = radv_info->due_time;
2442     }
2443
2444   return radv_info->keep_sending_rs;
2445 }
2446
2447 static uword
2448 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
2449                  vlib_frame_t * f0)
2450 {
2451   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2452   ip6_radv_t *radv_info;
2453   uword *event_data = 0;
2454   f64 sleep_time = 1e9;
2455   f64 current_time;
2456   f64 due_time;
2457   f64 dt = 0;
2458
2459   while (true)
2460     {
2461       vlib_process_wait_for_event_or_clock (vm, sleep_time);
2462       vlib_process_get_events (vm, &event_data);
2463       vec_reset_length (event_data);
2464
2465       current_time = vlib_time_now (vm);
2466       do
2467         {
2468           due_time = current_time + 1e9;
2469         /* *INDENT-OFF* */
2470         pool_foreach (radv_info, nm->if_radv_pool,
2471         ({
2472             if (check_send_rs (vm, radv_info, current_time, &dt)
2473                 && (dt < due_time))
2474               due_time = dt;
2475         }));
2476         /* *INDENT-ON* */
2477           current_time = vlib_time_now (vm);
2478         }
2479       while (due_time < current_time);
2480
2481       sleep_time = due_time - current_time;
2482     }
2483
2484   return 0;
2485 }
2486
2487 /* *INDENT-OFF* */
2488 VLIB_REGISTER_NODE (send_rs_process_node) = {
2489     .function = send_rs_process,
2490     .type = VLIB_NODE_TYPE_PROCESS,
2491     .name = "send-rs-process",
2492 };
2493 /* *INDENT-ON* */
2494
2495 void
2496 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
2497                                 icmp6_send_router_solicitation_params_t *
2498                                 params)
2499 {
2500   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2501   u32 rai;
2502   ip6_radv_t *ra = 0;
2503
2504   ASSERT (~0 != sw_if_index);
2505
2506   rai = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2507   ra = pool_elt_at_index (nm->if_radv_pool, rai);
2508
2509   stop_sending_rs (vm, ra);
2510
2511   if (!stop)
2512     {
2513       ra->keep_sending_rs = 1;
2514       ra->params = *params;
2515       ra->n_left = params->mrc;
2516       ra->start_time = vlib_time_now (vm);
2517       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
2518       ra->due_time = 0;         /* send first packet ASAP */
2519       ra->buffer = create_buffer_for_rs (vm, ra);
2520       if (!ra->buffer)
2521         ra->keep_sending_rs = 0;
2522       else
2523         vlib_process_signal_event (vm, send_rs_process_node.index, 1, 0);
2524     }
2525 }
2526
2527 /**
2528  * @brief Add a multicast Address to the advertised MLD set
2529  */
2530 static void
2531 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2532 {
2533   ip6_mldp_group_t *mcast_group_info;
2534   uword *p;
2535
2536   /* lookup  mldp info for this interface */
2537   p = mhash_get (&radv_info->address_to_mldp_index, addr);
2538   mcast_group_info =
2539     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2540
2541   /* add address */
2542   if (!mcast_group_info)
2543     {
2544       /* add */
2545       u32 mi;
2546       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2547
2548       mi = mcast_group_info - radv_info->mldp_group_pool;
2549       mhash_set (&radv_info->address_to_mldp_index, addr, mi,   /* old_value */
2550                  0);
2551
2552       mcast_group_info->type = 4;
2553       mcast_group_info->mcast_source_address_pool = 0;
2554       mcast_group_info->num_sources = 0;
2555       clib_memcpy (&mcast_group_info->mcast_address, addr,
2556                    sizeof (ip6_address_t));
2557     }
2558 }
2559
2560 /**
2561  * @brief Delete a multicast Address from the advertised MLD set
2562  */
2563 static void
2564 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2565 {
2566   ip6_mldp_group_t *mcast_group_info;
2567   uword *p;
2568
2569   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2570   mcast_group_info =
2571     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2572
2573   if (mcast_group_info)
2574     {
2575       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2576                    /* old_value */ 0);
2577       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2578     }
2579 }
2580
2581 /**
2582  * @brief Add a multicast Address to the advertised MLD set
2583  */
2584 static void
2585 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2586                           ip6_multicast_address_scope_t scope,
2587                           ip6_multicast_link_local_group_id_t group)
2588 {
2589   ip6_address_t addr;
2590
2591   ip6_set_reserved_multicast_address (&addr, scope, group);
2592
2593   ip6_neighbor_add_mld_prefix (a, &addr);
2594 }
2595
2596 /**
2597  * @brief create and initialize router advertisement parameters with default
2598  * values for this intfc
2599  */
2600 u32
2601 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2602                                    u32 sw_if_index, u32 is_add)
2603 {
2604   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2605   ip6_radv_t *a = 0;
2606   u32 ri = ~0;
2607   vnet_sw_interface_t *sw_if0;
2608   ethernet_interface_t *eth_if0 = 0;
2609
2610   /* lookup radv container  - ethernet interfaces only */
2611   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2612   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2613     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2614
2615   if (!eth_if0)
2616     return ri;
2617
2618   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2619                            ~0);
2620   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2621
2622   if (ri != ~0)
2623     {
2624       a = pool_elt_at_index (nm->if_radv_pool, ri);
2625
2626       if (!is_add)
2627         {
2628           ip6_radv_prefix_t *p;
2629           ip6_mldp_group_t *m;
2630
2631           /* release the lock on the interface's mcast adj */
2632           adj_unlock (a->mcast_adj_index);
2633
2634           /* clean up prefix and MDP pools */
2635           /* *INDENT-OFF* */
2636           pool_flush(p, a->adv_prefixes_pool,
2637           ({
2638               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2639           }));
2640           pool_flush (m, a->mldp_group_pool,
2641           ({
2642               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2643           }));
2644           /* *INDENT-ON* */
2645
2646           pool_free (a->mldp_group_pool);
2647           pool_free (a->adv_prefixes_pool);
2648
2649           mhash_free (&a->address_to_prefix_index);
2650           mhash_free (&a->address_to_mldp_index);
2651
2652           if (a->keep_sending_rs)
2653             a->keep_sending_rs = 0;
2654
2655           pool_put (nm->if_radv_pool, a);
2656           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2657           ri = ~0;
2658         }
2659     }
2660   else
2661     {
2662       if (is_add)
2663         {
2664           pool_get (nm->if_radv_pool, a);
2665
2666           ri = a - nm->if_radv_pool;
2667           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2668
2669           /* initialize default values (most of which are zero) */
2670           clib_memset (a, 0, sizeof (a[0]));
2671
2672           a->sw_if_index = sw_if_index;
2673           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2674           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2675           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2676           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2677
2678           /* send ll address source address option */
2679           a->adv_link_layer_address = 1;
2680
2681           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2682           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2683           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2684           a->seed = (u32) clib_cpu_time_now ();
2685           (void) random_u32 (&a->seed);
2686           a->randomizer = clib_cpu_time_now ();
2687           (void) random_u64 (&a->randomizer);
2688
2689           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2690           a->initial_adverts_sent = a->initial_adverts_count - 1;
2691           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2692
2693           /* deafult is to send */
2694           a->send_radv = 1;
2695
2696           /* fill in radv_info for this interface that will be needed later */
2697           a->adv_link_mtu =
2698             vnet_sw_interface_get_mtu (vnm, sw_if_index, VNET_MTU_IP6);
2699
2700           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2701
2702           /* fill in default link-local address  (this may be overridden) */
2703           ip6_link_local_address_from_ethernet_address
2704             (&a->link_local_address, eth_if0->address);
2705
2706           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2707                       sizeof (ip6_address_t));
2708           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2709                       sizeof (ip6_address_t));
2710
2711           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2712                                                       VNET_LINK_IP6,
2713                                                       sw_if_index);
2714
2715           a->keep_sending_rs = 0;
2716
2717           /* add multicast groups we will always be reporting  */
2718           ip6_neighbor_add_mld_grp (a,
2719                                     IP6_MULTICAST_SCOPE_link_local,
2720                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2721           ip6_neighbor_add_mld_grp (a,
2722                                     IP6_MULTICAST_SCOPE_link_local,
2723                                     IP6_MULTICAST_GROUP_ID_all_routers);
2724           ip6_neighbor_add_mld_grp (a,
2725                                     IP6_MULTICAST_SCOPE_link_local,
2726                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2727         }
2728     }
2729   return ri;
2730 }
2731
2732 /* send an mldpv2 report  */
2733 static void
2734 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2735 {
2736   vnet_main_t *vnm = vnet_get_main ();
2737   vlib_main_t *vm = vnm->vlib_main;
2738   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2739   vnet_sw_interface_t *sw_if0;
2740   ethernet_interface_t *eth_if0;
2741   u32 ri;
2742   int bogus_length;
2743
2744   ip6_radv_t *radv_info;
2745   u16 payload_length;
2746   vlib_buffer_t *b0;
2747   ip6_header_t *ip0;
2748   u32 *to_next;
2749   vlib_frame_t *f;
2750   u32 bo0;
2751   u32 n_to_alloc = 1;
2752   u32 n_allocated;
2753
2754   icmp6_multicast_listener_report_header_t *rh0;
2755   icmp6_multicast_listener_report_packet_t *rp0;
2756
2757   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2758   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2759   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2760
2761   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2762     return;
2763
2764   /* look up the radv_t  information for this interface */
2765   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2766                            ~0);
2767
2768   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2769
2770   if (ri == ~0)
2771     return;
2772
2773   /* send report now - build a mldpv2 report packet  */
2774   n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2775   if (PREDICT_FALSE (n_allocated == 0))
2776     {
2777     alloc_fail:
2778       clib_warning ("buffer allocation failure");
2779       return;
2780     }
2781
2782   b0 = vlib_get_buffer (vm, bo0);
2783
2784   /* adjust the sizeof the buffer to just include the ipv6 header */
2785   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2786
2787   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2788
2789   b0->error = ICMP6_ERROR_NONE;
2790
2791   rp0 = vlib_buffer_get_current (b0);
2792   ip0 = (ip6_header_t *) & rp0->ip;
2793   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2794
2795   clib_memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2796
2797   ip0->ip_version_traffic_class_and_flow_label =
2798     clib_host_to_net_u32 (0x6 << 28);
2799
2800   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2801   /* for DEBUG - vnet driver won't seem to emit router alerts */
2802   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2803   ip0->hop_limit = 1;
2804
2805   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2806
2807   /* source address MUST be the link-local address */
2808   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2809   ip0->src_address = radv_info->link_local_address;
2810
2811   /* destination is all mldpv2 routers */
2812   ip6_set_reserved_multicast_address (&ip0->dst_address,
2813                                       IP6_MULTICAST_SCOPE_link_local,
2814                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2815
2816   /* add reports here */
2817   ip6_mldp_group_t *m;
2818   int num_addr_records = 0;
2819   icmp6_multicast_address_record_t rr;
2820
2821   /* fill in the hop-by-hop extension header (router alert) info */
2822   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2823   rh0->ext_hdr.n_data_u64s = 0;
2824
2825   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2826   rh0->alert.len = 2;
2827   rh0->alert.value = 0;
2828
2829   rh0->pad.type = 1;
2830   rh0->pad.len = 0;
2831
2832   rh0->icmp.checksum = 0;
2833
2834   /* *INDENT-OFF* */
2835   pool_foreach (m, radv_info->mldp_group_pool,
2836   ({
2837     rr.type = m->type;
2838     rr.aux_data_len_u32s = 0;
2839     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2840     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2841
2842     num_addr_records++;
2843
2844     if(vlib_buffer_add_data (vm, &bo0, (void *)&rr,
2845                              sizeof(icmp6_multicast_address_record_t)))
2846       {
2847         vlib_buffer_free (vm, &bo0, 1);
2848         goto alloc_fail;
2849       }
2850
2851     payload_length += sizeof( icmp6_multicast_address_record_t);
2852   }));
2853   /* *INDENT-ON* */
2854
2855   rh0->rsvd = 0;
2856   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2857
2858   /* update lengths */
2859   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2860
2861   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2862                                                           &bogus_length);
2863   ASSERT (bogus_length == 0);
2864
2865   /*
2866    * OK to override w/ no regard for actual FIB, because
2867    * ip6-rewrite only looks at the adjacency.
2868    */
2869   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2870     vnet_main.local_interface_sw_if_index;
2871
2872   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2873   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2874
2875   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2876
2877   f = vlib_get_frame_to_node (vm, node->index);
2878   to_next = vlib_frame_vector_args (f);
2879   to_next[0] = bo0;
2880   f->n_vectors = 1;
2881
2882   vlib_put_frame_to_node (vm, node->index, f);
2883   return;
2884 }
2885
2886 /* *INDENT-OFF* */
2887 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2888 {
2889   .function = icmp6_router_solicitation,
2890   .name = "icmp6-router-solicitation",
2891
2892   .vector_size = sizeof (u32),
2893
2894   .format_trace = format_icmp6_input_trace,
2895
2896   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2897   .next_nodes = {
2898     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
2899     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2900     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2901   },
2902 };
2903 /* *INDENT-ON* */
2904
2905 /* send a RA or update the timer info etc.. */
2906 static uword
2907 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2908                                   vlib_node_runtime_t * node,
2909                                   vlib_frame_t * frame)
2910 {
2911   vnet_main_t *vnm = vnet_get_main ();
2912   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2913   ip6_radv_t *radv_info;
2914   vlib_frame_t *f = 0;
2915   u32 n_this_frame = 0;
2916   u32 n_left_to_next = 0;
2917   u32 *to_next = 0;
2918   u32 bo0;
2919   icmp6_router_solicitation_header_t *h0;
2920   vlib_buffer_t *b0;
2921   f64 now = vlib_time_now (vm);
2922
2923   /* Interface ip6 radv info list */
2924   /* *INDENT-OFF* */
2925   pool_foreach (radv_info, nm->if_radv_pool,
2926   ({
2927     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2928       {
2929         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2930         radv_info->next_multicast_time = now;
2931         radv_info->last_multicast_time = now;
2932         radv_info->last_radv_time = 0;
2933         radv_info->all_routers_mcast = 0;
2934         continue;
2935       }
2936
2937     /* Make sure that we've joined the all-routers multicast group */
2938     if(!radv_info->all_routers_mcast)
2939       {
2940         /* send MDLP_REPORT_EVENT message */
2941         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2942         radv_info->all_routers_mcast = 1;
2943       }
2944
2945     /* is it time to send a multicast  RA on this interface? */
2946     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2947       {
2948         u32 n_to_alloc = 1;
2949         u32 n_allocated;
2950
2951         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2952           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2953
2954         /* multicast send - compute next multicast send time */
2955         if( radv_info->initial_adverts_sent > 0)
2956           {
2957             radv_info->initial_adverts_sent--;
2958             if(rfn > radv_info-> initial_adverts_interval)
2959               rfn =  radv_info-> initial_adverts_interval;
2960
2961             /* check to see if we are ceasing to send */
2962             if( radv_info->initial_adverts_sent  == 0)
2963               if(radv_info->cease_radv)
2964                 radv_info->send_radv = 0;
2965           }
2966
2967         radv_info->next_multicast_time =  rfn + now;
2968         radv_info->last_multicast_time = now;
2969
2970         /* send advert now - build a "solicted" router advert with unspecified source address */
2971         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2972
2973         if (PREDICT_FALSE(n_allocated == 0))
2974           {
2975             clib_warning ("buffer allocation failure");
2976             continue;
2977           }
2978         b0 = vlib_get_buffer (vm, bo0);
2979         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2980         b0->error = ICMP6_ERROR_NONE;
2981         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2982
2983         h0 =  vlib_buffer_get_current (b0);
2984
2985         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2986
2987         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2988         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2989                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2990         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2991         h0->ip.hop_limit = 255;
2992
2993         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
2994         h0->ip.src_address.as_u64[0] = 0;
2995         h0->ip.src_address.as_u64[1] = 0;
2996
2997         h0->ip.dst_address.as_u64[0] = 0;
2998         h0->ip.dst_address.as_u64[1] = 0;
2999
3000         h0->neighbor.icmp.type = ICMP6_router_solicitation;
3001
3002         if (PREDICT_FALSE(f == 0))
3003           {
3004             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
3005             to_next = vlib_frame_vector_args (f);
3006             n_left_to_next = VLIB_FRAME_SIZE;
3007             n_this_frame = 0;
3008           }
3009
3010         n_this_frame++;
3011         n_left_to_next--;
3012         to_next[0] = bo0;
3013         to_next += 1;
3014
3015         if (PREDICT_FALSE(n_left_to_next == 0))
3016           {
3017             f->n_vectors = n_this_frame;
3018             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3019             f = 0;
3020           }
3021       }
3022   }));
3023   /* *INDENT-ON* */
3024
3025   if (f)
3026     {
3027       ASSERT (n_this_frame);
3028       f->n_vectors = n_this_frame;
3029       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3030     }
3031   return 0;
3032 }
3033
3034 static uword
3035 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
3036                                            vlib_node_runtime_t * node,
3037                                            vlib_frame_t * frame)
3038 {
3039   uword event_type;
3040   ip6_icmp_neighbor_discovery_event_data_t *event_data;
3041
3042   /* init code here */
3043
3044   while (1)
3045     {
3046       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
3047
3048       event_data = vlib_process_get_event_data (vm, &event_type);
3049
3050       if (!event_data)
3051         {
3052           /* No events found: timer expired. */
3053           /* process interface list and send RAs as appropriate, update timer info */
3054           ip6_neighbor_process_timer_event (vm, node, frame);
3055         }
3056       else
3057         {
3058           switch (event_type)
3059             {
3060
3061             case ICMP6_ND_EVENT_INIT:
3062               break;
3063
3064             case ~0:
3065               break;
3066
3067             default:
3068               ASSERT (0);
3069             }
3070
3071           if (event_data)
3072             _vec_len (event_data) = 0;
3073         }
3074     }
3075   return frame->n_vectors;
3076 }
3077
3078 /* *INDENT-OFF* */
3079 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
3080 {
3081   .function = icmp6_router_advertisement,
3082   .name = "icmp6-router-advertisement",
3083
3084   .vector_size = sizeof (u32),
3085
3086   .format_trace = format_icmp6_input_trace,
3087
3088   .n_next_nodes = 1,
3089   .next_nodes = {
3090     [0] = "ip6-drop",
3091   },
3092 };
3093 /* *INDENT-ON* */
3094
3095 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
3096
3097   .function = ip6_icmp_neighbor_discovery_event_process,
3098   .name = "ip6-icmp-neighbor-discovery-event-process",
3099   .type = VLIB_NODE_TYPE_PROCESS,
3100 };
3101
3102 static uword
3103 icmp6_neighbor_solicitation (vlib_main_t * vm,
3104                              vlib_node_runtime_t * node, vlib_frame_t * frame)
3105 {
3106   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3107                                                        /* is_solicitation */
3108                                                        1);
3109 }
3110
3111 static uword
3112 icmp6_neighbor_advertisement (vlib_main_t * vm,
3113                               vlib_node_runtime_t * node,
3114                               vlib_frame_t * frame)
3115 {
3116   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3117                                                        /* is_solicitation */
3118                                                        0);
3119 }
3120
3121 /* *INDENT-OFF* */
3122 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
3123 {
3124   .function = icmp6_neighbor_solicitation,
3125   .name = "icmp6-neighbor-solicitation",
3126
3127   .vector_size = sizeof (u32),
3128
3129   .format_trace = format_icmp6_input_trace,
3130
3131   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
3132   .next_nodes = {
3133     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "ip6-drop",
3134     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
3135   },
3136 };
3137 /* *INDENT-ON* */
3138
3139 /* *INDENT-OFF* */
3140 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
3141 {
3142   .function = icmp6_neighbor_advertisement,
3143   .name = "icmp6-neighbor-advertisement",
3144
3145   .vector_size = sizeof (u32),
3146
3147   .format_trace = format_icmp6_input_trace,
3148
3149   .n_next_nodes = 1,
3150   .next_nodes = {
3151     [0] = "ip6-drop",
3152   },
3153 };
3154 /* *INDENT-ON* */
3155
3156 typedef enum
3157 {
3158   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3159   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
3160   IP6_DISCOVER_NEIGHBOR_N_NEXT,
3161 } ip6_discover_neighbor_next_t;
3162
3163 typedef enum
3164 {
3165   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
3166   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
3167   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
3168 } ip6_discover_neighbor_error_t;
3169
3170 static uword
3171 ip6_discover_neighbor_inline (vlib_main_t * vm,
3172                               vlib_node_runtime_t * node,
3173                               vlib_frame_t * frame, int is_glean)
3174 {
3175   vnet_main_t *vnm = vnet_get_main ();
3176   ip6_main_t *im = &ip6_main;
3177   ip_lookup_main_t *lm = &im->lookup_main;
3178   u32 *from, *to_next_drop;
3179   uword n_left_from, n_left_to_next_drop;
3180   u64 seed;
3181   u32 thread_index = vm->thread_index;
3182   int bogus_length;
3183   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3184
3185   if (node->flags & VLIB_NODE_FLAG_TRACE)
3186     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
3187
3188   seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm));
3189
3190   from = vlib_frame_vector_args (frame);
3191   n_left_from = frame->n_vectors;
3192
3193   while (n_left_from > 0)
3194     {
3195       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3196                            to_next_drop, n_left_to_next_drop);
3197
3198       while (n_left_from > 0 && n_left_to_next_drop > 0)
3199         {
3200           u32 pi0, adj_index0, sw_if_index0, drop0, r0, next0;
3201           vnet_hw_interface_t *hw_if0;
3202           ip6_radv_t *radv_info;
3203           ip_adjacency_t *adj0;
3204           vlib_buffer_t *p0;
3205           ip6_header_t *ip0;
3206
3207           pi0 = from[0];
3208
3209           p0 = vlib_get_buffer (vm, pi0);
3210
3211           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
3212
3213           ip0 = vlib_buffer_get_current (p0);
3214
3215           adj0 = adj_get (adj_index0);
3216
3217           if (!is_glean)
3218             {
3219               ip0->dst_address.as_u64[0] =
3220                 adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
3221               ip0->dst_address.as_u64[1] =
3222                 adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
3223             }
3224
3225           sw_if_index0 = adj0->rewrite_header.sw_if_index;
3226           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
3227
3228           /* combine the address and interface for a hash */
3229           r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0;
3230
3231           drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed);
3232
3233           from += 1;
3234           n_left_from -= 1;
3235           to_next_drop[0] = pi0;
3236           to_next_drop += 1;
3237           n_left_to_next_drop -= 1;
3238
3239           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
3240
3241           /* If the interface is link-down, drop the pkt */
3242           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
3243             drop0 = 1;
3244
3245           if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0)
3246             {
3247               u32 ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
3248
3249               if (ri != ~0)
3250                 radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3251               else
3252                 drop0 = 1;
3253             }
3254           else
3255             drop0 = 1;
3256
3257           /*
3258            * the adj has been updated to a rewrite but the node the DPO that got
3259            * us here hasn't - yet. no big deal. we'll drop while we wait.
3260            */
3261           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
3262             drop0 = 1;
3263
3264           p0->error =
3265             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
3266                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
3267
3268           if (drop0)
3269             continue;
3270
3271           {
3272             u32 bi0 = 0;
3273             icmp6_neighbor_solicitation_header_t *h0;
3274             vlib_buffer_t *b0;
3275
3276             h0 = vlib_packet_template_get_packet
3277               (vm, &im->discover_neighbor_packet_template, &bi0);
3278             if (!h0)
3279               continue;
3280
3281             /* copy the persistent fields from the original */
3282             b0 = vlib_get_buffer (vm, bi0);
3283             clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
3284
3285             /*
3286              * Build ethernet header.
3287              * Choose source address based on destination lookup
3288              * adjacency.
3289              */
3290             if (!ip6_src_address_for_packet (lm,
3291                                              sw_if_index0,
3292                                              &ip0->dst_address,
3293                                              &h0->ip.src_address))
3294               {
3295                 /* There is no address on the interface */
3296                 p0->error =
3297                   node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
3298                 vlib_buffer_free (vm, &bi0, 1);
3299                 continue;
3300               }
3301
3302             /*
3303              * Destination address is a solicited node multicast address.
3304              * We need to fill in
3305              * the low 24 bits with low 24 bits of target's address.
3306              */
3307             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
3308             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
3309             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
3310
3311             h0->neighbor.target_address = ip0->dst_address;
3312
3313             clib_memcpy (h0->link_layer_option.ethernet_address,
3314                          hw_if0->hw_address, vec_len (hw_if0->hw_address));
3315
3316             /* $$$$ appears we need this; why is the checksum non-zero? */
3317             h0->neighbor.icmp.checksum = 0;
3318             h0->neighbor.icmp.checksum =
3319               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
3320                                                  &bogus_length);
3321
3322             ASSERT (bogus_length == 0);
3323
3324             vlib_buffer_copy_trace_flag (vm, p0, bi0);
3325             vnet_buffer (b0)->sw_if_index[VLIB_TX]
3326               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
3327
3328             vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
3329               radv_info->mcast_adj_index;
3330
3331             b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
3332             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
3333
3334             vlib_set_next_frame_buffer (vm, node, next0, bi0);
3335           }
3336         }
3337
3338       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3339                            n_left_to_next_drop);
3340     }
3341
3342   return frame->n_vectors;
3343 }
3344
3345 static uword
3346 ip6_discover_neighbor (vlib_main_t * vm,
3347                        vlib_node_runtime_t * node, vlib_frame_t * frame)
3348 {
3349   return (ip6_discover_neighbor_inline (vm, node, frame, 0));
3350 }
3351
3352 static uword
3353 ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
3354 {
3355   return (ip6_discover_neighbor_inline (vm, node, frame, 1));
3356 }
3357
3358 static char *ip6_discover_neighbor_error_strings[] = {
3359   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
3360   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
3361   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
3362     = "no source address for ND solicitation",
3363 };
3364
3365 /* *INDENT-OFF* */
3366 VLIB_REGISTER_NODE (ip6_glean_node) =
3367 {
3368   .function = ip6_glean,
3369   .name = "ip6-glean",
3370   .vector_size = sizeof (u32),
3371   .format_trace = format_ip6_forward_next_trace,
3372   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3373   .error_strings = ip6_discover_neighbor_error_strings,
3374   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3375   .next_nodes =
3376   {
3377     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3378     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3379   },
3380 };
3381 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
3382 {
3383   .function = ip6_discover_neighbor,
3384   .name = "ip6-discover-neighbor",
3385   .vector_size = sizeof (u32),
3386   .format_trace = format_ip6_forward_next_trace,
3387   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3388   .error_strings = ip6_discover_neighbor_error_strings,
3389   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3390   .next_nodes =
3391   {
3392     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3393     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3394   },
3395 };
3396 /* *INDENT-ON* */
3397
3398 /* API support functions */
3399 int
3400 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
3401                         u8 suppress, u8 managed, u8 other,
3402                         u8 ll_option, u8 send_unicast, u8 cease,
3403                         u8 use_lifetime, u32 lifetime,
3404                         u32 initial_count, u32 initial_interval,
3405                         u32 max_interval, u32 min_interval, u8 is_no)
3406 {
3407   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3408   int error;
3409   u32 ri;
3410
3411   /* look up the radv_t  information for this interface */
3412   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3413                            ~0);
3414   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3415   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3416
3417   if (!error)
3418     {
3419
3420       ip6_radv_t *radv_info;
3421       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3422
3423       if ((max_interval != 0) && (min_interval == 0))
3424         min_interval = .75 * max_interval;
3425
3426       max_interval =
3427         (max_interval !=
3428          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
3429         radv_info->max_radv_interval;
3430       min_interval =
3431         (min_interval !=
3432          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
3433         radv_info->min_radv_interval;
3434       lifetime =
3435         (use_lifetime !=
3436          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
3437         radv_info->adv_router_lifetime_in_sec;
3438
3439       if (lifetime)
3440         {
3441           if (lifetime > MAX_DEF_RTR_LIFETIME)
3442             lifetime = MAX_DEF_RTR_LIFETIME;
3443
3444           if (lifetime <= max_interval)
3445             return VNET_API_ERROR_INVALID_VALUE;
3446         }
3447
3448       if (min_interval != 0)
3449         {
3450           if ((min_interval > .75 * max_interval) || (min_interval < 3))
3451             return VNET_API_ERROR_INVALID_VALUE;
3452         }
3453
3454       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
3455           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
3456         return VNET_API_ERROR_INVALID_VALUE;
3457
3458       /*
3459          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
3460          if "flag" is clear  don't change corresponding value
3461        */
3462       radv_info->send_radv =
3463         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
3464       radv_info->adv_managed_flag =
3465         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
3466       radv_info->adv_other_flag =
3467         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
3468       radv_info->adv_link_layer_address =
3469         (ll_option !=
3470          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
3471       radv_info->send_unicast =
3472         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
3473       radv_info->cease_radv =
3474         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
3475
3476       radv_info->min_radv_interval = min_interval;
3477       radv_info->max_radv_interval = max_interval;
3478       radv_info->adv_router_lifetime_in_sec = lifetime;
3479
3480       radv_info->initial_adverts_count =
3481         (initial_count !=
3482          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
3483         radv_info->initial_adverts_count;
3484       radv_info->initial_adverts_interval =
3485         (initial_interval !=
3486          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
3487         radv_info->initial_adverts_interval;
3488
3489       /* restart */
3490       if ((cease != 0) && (is_no))
3491         radv_info->send_radv = 1;
3492
3493       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3494       radv_info->next_multicast_time = vlib_time_now (vm);
3495       radv_info->last_multicast_time = vlib_time_now (vm);
3496       radv_info->last_radv_time = 0;
3497     }
3498   return (error);
3499 }
3500
3501 int
3502 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
3503                         ip6_address_t * prefix_addr, u8 prefix_len,
3504                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
3505                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
3506                         u8 no_onlink, u8 is_no)
3507 {
3508   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3509   int error;
3510
3511   u32 ri;
3512
3513   /* look up the radv_t  information for this interface */
3514   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3515                            ~0);
3516
3517   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3518
3519   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3520
3521   if (!error)
3522     {
3523       f64 now = vlib_time_now (vm);
3524       ip6_radv_t *radv_info;
3525       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3526
3527       /* prefix info add, delete or update */
3528       ip6_radv_prefix_t *prefix;
3529
3530       /* lookup  prefix info for this  address on this interface */
3531       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
3532
3533       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
3534
3535       if (is_no)
3536         {
3537           /* delete */
3538           if (!prefix)
3539             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
3540
3541           if (prefix->prefix_len != prefix_len)
3542             return VNET_API_ERROR_INVALID_VALUE_2;
3543
3544           /* FIXME - Should the DP do this or the CP ? */
3545           /* do specific delete processing here before returning */
3546           /* try to remove from routing table */
3547
3548           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
3549                        /* old_value */ 0);
3550           pool_put (radv_info->adv_prefixes_pool, prefix);
3551
3552           radv_info->initial_adverts_sent =
3553             radv_info->initial_adverts_count - 1;
3554           radv_info->next_multicast_time = vlib_time_now (vm);
3555           radv_info->last_multicast_time = vlib_time_now (vm);
3556           radv_info->last_radv_time = 0;
3557           return (error);
3558         }
3559
3560       /* adding or changing */
3561       if (!prefix)
3562         {
3563           /* add */
3564           u32 pi;
3565           pool_get (radv_info->adv_prefixes_pool, prefix);
3566           pi = prefix - radv_info->adv_prefixes_pool;
3567           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
3568                      /* old_value */ 0);
3569
3570           clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
3571
3572           prefix->prefix_len = prefix_len;
3573           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
3574
3575           /* initialize default values */
3576           prefix->adv_on_link_flag = 1; /* L bit set */
3577           prefix->adv_autonomous_flag = 1;      /* A bit set */
3578           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
3579           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
3580           prefix->enabled = 1;
3581           prefix->decrement_lifetime_flag = 1;
3582           prefix->deprecated_prefix_flag = 1;
3583
3584           if (off_link == 0)
3585             {
3586               /* FIXME - Should the DP do this or the CP ? */
3587               /* insert prefix into routing table as a connected prefix */
3588             }
3589
3590           if (use_default)
3591             goto restart;
3592         }
3593       else
3594         {
3595
3596           if (prefix->prefix_len != prefix_len)
3597             return VNET_API_ERROR_INVALID_VALUE_2;
3598
3599           if (off_link != 0)
3600             {
3601               /* FIXME - Should the DP do this or the CP ? */
3602               /* remove from routing table if already there */
3603             }
3604         }
3605
3606       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
3607         {
3608           prefix->adv_valid_lifetime_in_secs = ~0;
3609           prefix->adv_pref_lifetime_in_secs = ~0;
3610           prefix->decrement_lifetime_flag = 0;
3611         }
3612       else
3613         {
3614           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
3615           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
3616         }
3617
3618       /* copy  remaining */
3619       prefix->enabled = !(no_advertise != 0);
3620       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
3621       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
3622
3623     restart:
3624       /* restart */
3625       /* fill in the expiration times  */
3626       prefix->valid_lifetime_expires =
3627         now + prefix->adv_valid_lifetime_in_secs;
3628       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
3629
3630       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3631       radv_info->next_multicast_time = vlib_time_now (vm);
3632       radv_info->last_multicast_time = vlib_time_now (vm);
3633       radv_info->last_radv_time = 0;
3634     }
3635   return (error);
3636 }
3637
3638 clib_error_t *
3639 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
3640                   vlib_cli_command_t * cmd)
3641 {
3642   vnet_main_t *vnm = vnet_get_main ();
3643   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3644   clib_error_t *error = 0;
3645   u8 is_no = 0;
3646   u8 suppress = 0, managed = 0, other = 0;
3647   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
3648   u8 use_lifetime = 0;
3649   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
3650     0, ra_initial_interval = 0;
3651   u32 ra_max_interval = 0, ra_min_interval = 0;
3652
3653   unformat_input_t _line_input, *line_input = &_line_input;
3654   vnet_sw_interface_t *sw_if0;
3655
3656   int add_radv_info = 1;
3657   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
3658   ip6_address_t ip6_addr;
3659   u32 addr_len;
3660
3661
3662   /* Get a line of input. */
3663   if (!unformat_user (main_input, unformat_line_input, line_input))
3664     return 0;
3665
3666   /* get basic radv info for this interface */
3667   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3668     {
3669
3670       if (unformat_user (line_input,
3671                          unformat_vnet_sw_interface, vnm, &sw_if_index))
3672         {
3673           u32 ri;
3674           ethernet_interface_t *eth_if0 = 0;
3675
3676           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3677           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3678             eth_if0 =
3679               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3680
3681           if (!eth_if0)
3682             {
3683               error =
3684                 clib_error_return (0, "Interface must be of ethernet type");
3685               goto done;
3686             }
3687
3688           /* look up the radv_t  information for this interface */
3689           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3690                                    sw_if_index, ~0);
3691
3692           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3693
3694           if (ri != ~0)
3695             {
3696               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3697             }
3698           else
3699             {
3700               error = clib_error_return (0, "unknown interface %U'",
3701                                          format_unformat_error, line_input);
3702               goto done;
3703             }
3704         }
3705       else
3706         {
3707           error = clib_error_return (0, "invalid interface name %U'",
3708                                      format_unformat_error, line_input);
3709           goto done;
3710         }
3711     }
3712
3713   /* get the rest of the command */
3714   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3715     {
3716       if (unformat (line_input, "no"))
3717         is_no = 1;
3718       else if (unformat (line_input, "prefix %U/%d",
3719                          unformat_ip6_address, &ip6_addr, &addr_len))
3720         {
3721           add_radv_info = 0;
3722           break;
3723         }
3724       else if (unformat (line_input, "ra-managed-config-flag"))
3725         {
3726           managed = 1;
3727           break;
3728         }
3729       else if (unformat (line_input, "ra-other-config-flag"))
3730         {
3731           other = 1;
3732           break;
3733         }
3734       else if (unformat (line_input, "ra-suppress") ||
3735                unformat (line_input, "ra-surpress"))
3736         {
3737           suppress = 1;
3738           break;
3739         }
3740       else if (unformat (line_input, "ra-suppress-link-layer") ||
3741                unformat (line_input, "ra-surpress-link-layer"))
3742         {
3743           suppress_ll_option = 1;
3744           break;
3745         }
3746       else if (unformat (line_input, "ra-send-unicast"))
3747         {
3748           send_unicast = 1;
3749           break;
3750         }
3751       else if (unformat (line_input, "ra-lifetime"))
3752         {
3753           if (!unformat (line_input, "%d", &ra_lifetime))
3754             {
3755               error = unformat_parse_error (line_input);
3756               goto done;
3757             }
3758           use_lifetime = 1;
3759           break;
3760         }
3761       else if (unformat (line_input, "ra-initial"))
3762         {
3763           if (!unformat
3764               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3765             {
3766               error = unformat_parse_error (line_input);
3767               goto done;
3768             }
3769           break;
3770         }
3771       else if (unformat (line_input, "ra-interval"))
3772         {
3773           if (!unformat (line_input, "%d", &ra_max_interval))
3774             {
3775               error = unformat_parse_error (line_input);
3776               goto done;
3777             }
3778
3779           if (!unformat (line_input, "%d", &ra_min_interval))
3780             ra_min_interval = 0;
3781           break;
3782         }
3783       else if (unformat (line_input, "ra-cease"))
3784         {
3785           cease = 1;
3786           break;
3787         }
3788       else
3789         {
3790           error = unformat_parse_error (line_input);
3791           goto done;
3792         }
3793     }
3794
3795   if (add_radv_info)
3796     {
3797       ip6_neighbor_ra_config (vm, sw_if_index,
3798                               suppress, managed, other,
3799                               suppress_ll_option, send_unicast, cease,
3800                               use_lifetime, ra_lifetime,
3801                               ra_initial_count, ra_initial_interval,
3802                               ra_max_interval, ra_min_interval, is_no);
3803     }
3804   else
3805     {
3806       u32 valid_lifetime_in_secs = 0;
3807       u32 pref_lifetime_in_secs = 0;
3808       u8 use_prefix_default_values = 0;
3809       u8 no_advertise = 0;
3810       u8 off_link = 0;
3811       u8 no_autoconfig = 0;
3812       u8 no_onlink = 0;
3813
3814       /* get the rest of the command */
3815       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3816         {
3817           if (unformat (line_input, "default"))
3818             {
3819               use_prefix_default_values = 1;
3820               break;
3821             }
3822           else if (unformat (line_input, "infinite"))
3823             {
3824               valid_lifetime_in_secs = ~0;
3825               pref_lifetime_in_secs = ~0;
3826               break;
3827             }
3828           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3829                              &pref_lifetime_in_secs))
3830             break;
3831           else
3832             break;
3833         }
3834
3835
3836       /* get the rest of the command */
3837       while (!use_prefix_default_values &&
3838              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3839         {
3840           if (unformat (line_input, "no-advertise"))
3841             no_advertise = 1;
3842           else if (unformat (line_input, "off-link"))
3843             off_link = 1;
3844           else if (unformat (line_input, "no-autoconfig"))
3845             no_autoconfig = 1;
3846           else if (unformat (line_input, "no-onlink"))
3847             no_onlink = 1;
3848           else
3849             {
3850               error = unformat_parse_error (line_input);
3851               goto done;
3852             }
3853         }
3854
3855       ip6_neighbor_ra_prefix (vm, sw_if_index,
3856                               &ip6_addr, addr_len,
3857                               use_prefix_default_values,
3858                               valid_lifetime_in_secs,
3859                               pref_lifetime_in_secs,
3860                               no_advertise,
3861                               off_link, no_autoconfig, no_onlink, is_no);
3862     }
3863
3864 done:
3865   unformat_free (line_input);
3866
3867   return error;
3868 }
3869
3870 static void
3871 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3872 {
3873   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3874   u32 i;
3875
3876   for (i = 0; i < vec_len (addrs); i++)
3877     {
3878       ip_interface_address_t *a =
3879         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3880       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3881
3882       vlib_cli_output (vm, "\t\t%U/%d",
3883                        format_ip6_address, address, a->address_length);
3884     }
3885 }
3886
3887 static clib_error_t *
3888 show_ip6_interface_cmd (vlib_main_t * vm,
3889                         unformat_input_t * input, vlib_cli_command_t * cmd)
3890 {
3891   vnet_main_t *vnm = vnet_get_main ();
3892   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3893   clib_error_t *error = 0;
3894   u32 sw_if_index;
3895
3896   sw_if_index = ~0;
3897
3898   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3899     {
3900       u32 ri;
3901
3902       /* look up the radv_t  information for this interface */
3903       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3904                                sw_if_index, ~0);
3905
3906       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3907
3908       if (ri != ~0)
3909         {
3910           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3911           ip6_radv_t *radv_info;
3912           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3913
3914           vlib_cli_output (vm, "%U is admin %s\n",
3915                            format_vnet_sw_interface_name, vnm,
3916                            vnet_get_sw_interface (vnm, sw_if_index),
3917                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3918                             "up" : "down"));
3919
3920           u32 ai;
3921           u32 *link_scope = 0, *global_scope = 0;
3922           u32 *local_scope = 0, *unknown_scope = 0;
3923           ip_interface_address_t *a;
3924
3925           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3926                                    sw_if_index, ~0);
3927           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3928
3929           while (ai != (u32) ~ 0)
3930             {
3931               a = pool_elt_at_index (lm->if_address_pool, ai);
3932               ip6_address_t *address =
3933                 ip_interface_address_get_address (lm, a);
3934
3935               if (ip6_address_is_link_local_unicast (address))
3936                 vec_add1 (link_scope, ai);
3937               else if (ip6_address_is_global_unicast (address))
3938                 vec_add1 (global_scope, ai);
3939               else if (ip6_address_is_local_unicast (address))
3940                 vec_add1 (local_scope, ai);
3941               else
3942                 vec_add1 (unknown_scope, ai);
3943
3944               ai = a->next_this_sw_interface;
3945             }
3946
3947           if (vec_len (link_scope))
3948             {
3949               vlib_cli_output (vm, "\tLink-local address(es):\n");
3950               ip6_print_addrs (vm, link_scope);
3951               vec_free (link_scope);
3952             }
3953
3954           if (vec_len (local_scope))
3955             {
3956               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3957               ip6_print_addrs (vm, local_scope);
3958               vec_free (local_scope);
3959             }
3960
3961           if (vec_len (global_scope))
3962             {
3963               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3964               ip6_print_addrs (vm, global_scope);
3965               vec_free (global_scope);
3966             }
3967
3968           if (vec_len (unknown_scope))
3969             {
3970               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3971               ip6_print_addrs (vm, unknown_scope);
3972               vec_free (unknown_scope);
3973             }
3974
3975           vlib_cli_output (vm, "\tLink-local address(es):\n");
3976           vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3977                            &radv_info->link_local_address);
3978
3979           vlib_cli_output (vm, "\tJoined group address(es):\n");
3980           ip6_mldp_group_t *m;
3981           /* *INDENT-OFF* */
3982           pool_foreach (m, radv_info->mldp_group_pool,
3983           ({
3984             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3985                              &m->mcast_address);
3986           }));
3987           /* *INDENT-ON* */
3988
3989           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3990           ip6_radv_prefix_t *p;
3991           /* *INDENT-OFF* */
3992           pool_foreach (p, radv_info->adv_prefixes_pool,
3993           ({
3994             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
3995                              format_ip6_address, &p->prefix, p->prefix_len);
3996           }));
3997           /* *INDENT-ON* */
3998
3999           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
4000           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
4001           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
4002           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
4003           vlib_cli_output (vm, "\tND DAD is disabled\n");
4004           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
4005           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
4006                            radv_info->adv_neighbor_reachable_time_in_msec);
4007           vlib_cli_output (vm,
4008                            "\tND advertised retransmit interval is %d (msec)\n",
4009                            radv_info->
4010                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
4011
4012           u32 ra_interval = radv_info->max_radv_interval;
4013           u32 ra_interval_min = radv_info->min_radv_interval;
4014           vlib_cli_output (vm,
4015                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
4016                            ra_interval, ra_interval_min);
4017           vlib_cli_output (vm,
4018                            "\tND router advertisements live for %d seconds\n",
4019                            radv_info->adv_router_lifetime_in_sec);
4020           vlib_cli_output (vm,
4021                            "\tHosts %s stateless autoconfig for addresses\n",
4022                            (radv_info->adv_managed_flag) ? "use" :
4023                            " don't use");
4024           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
4025                            radv_info->n_advertisements_sent);
4026           vlib_cli_output (vm, "\tND router solicitations received %d\n",
4027                            radv_info->n_solicitations_rcvd);
4028           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
4029                            radv_info->n_solicitations_dropped);
4030         }
4031       else
4032         {
4033           error = clib_error_return (0, "IPv6 not enabled on interface",
4034                                      format_unformat_error, input);
4035
4036         }
4037     }
4038   return error;
4039 }
4040
4041 /*?
4042  * This command is used to display various IPv6 attributes on a given
4043  * interface.
4044  *
4045  * @cliexpar
4046  * Example of how to display IPv6 settings:
4047  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4048  * GigabitEthernet2/0/0 is admin up
4049  *         Link-local address(es):
4050  *                 fe80::ab8/64
4051  *         Joined group address(es):
4052  *                 ff02::1
4053  *                 ff02::2
4054  *                 ff02::16
4055  *                 ff02::1:ff00:ab8
4056  *         Advertised Prefixes:
4057  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
4058  *         MTU is 1500
4059  *         ICMP error messages are unlimited
4060  *         ICMP redirects are disabled
4061  *         ICMP unreachables are not sent
4062  *         ND DAD is disabled
4063  *         ND advertised reachable time is 0
4064  *         ND advertised retransmit interval is 0 (msec)
4065  *         ND router advertisements are sent every 200 seconds (min interval is 150)
4066  *         ND router advertisements live for 600 seconds
4067  *         Hosts use stateless autoconfig for addresses
4068  *         ND router advertisements sent 19336
4069  *         ND router solicitations received 0
4070  *         ND router solicitations dropped 0
4071  * @cliexend
4072  * Example of output if IPv6 is not enabled on the interface:
4073  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4074  * show ip6 interface: IPv6 not enabled on interface
4075  * @cliexend
4076 ?*/
4077 /* *INDENT-OFF* */
4078 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
4079 {
4080   .path = "show ip6 interface",
4081   .function = show_ip6_interface_cmd,
4082   .short_help = "show ip6 interface <interface>",
4083 };
4084 /* *INDENT-ON* */
4085
4086 clib_error_t *
4087 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4088 {
4089   clib_error_t *error = 0;
4090   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4091   u32 ri;
4092
4093   /* look up the radv_t  information for this interface */
4094   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4095                            ~0);
4096   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4097
4098   /* if not created - do nothing */
4099   if (ri != ~0)
4100     {
4101       ip6_radv_t *radv_info;
4102
4103       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4104
4105       /* check radv_info ref count for other ip6 addresses on this interface */
4106       /* This implicitly excludes the link local address */
4107       if (radv_info->ref_count == 0)
4108         {
4109           /* essentially "disables" ipv6 on this interface */
4110           ip6_ll_prefix_t ilp = {
4111             .ilp_addr = radv_info->link_local_address,
4112             .ilp_sw_if_index = sw_if_index,
4113           };
4114           ip6_ll_table_entry_delete (&ilp);
4115           ip6_sw_interface_enable_disable (sw_if_index, 0);
4116           ip6_mfib_interface_enable_disable (sw_if_index, 0);
4117           ip6_neighbor_sw_interface_add_del (vnet_get_main (), sw_if_index,
4118                                              0);
4119         }
4120     }
4121   return error;
4122 }
4123
4124 int
4125 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
4126 {
4127   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4128   u32 ri = ~0;
4129
4130   /* look up the radv_t  information for this interface */
4131   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4132                            ~0);
4133
4134   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4135
4136   return ri != ~0;
4137 }
4138
4139 clib_error_t *
4140 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4141 {
4142   clib_error_t *error = 0;
4143   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4144   u32 ri;
4145   int is_add = 1;
4146
4147   /* look up the radv_t  information for this interface */
4148   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4149                            ~0);
4150
4151   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4152
4153   /* if not created yet */
4154   if (ri == ~0)
4155     {
4156       vnet_main_t *vnm = vnet_get_main ();
4157       vnet_sw_interface_t *sw_if0;
4158
4159       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
4160       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
4161         {
4162           ethernet_interface_t *eth_if0;
4163
4164           eth_if0 =
4165             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
4166           if (eth_if0)
4167             {
4168               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
4169               ri =
4170                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
4171
4172               if (ri != ~0)
4173                 {
4174                   ip6_radv_t *radv_info;
4175                   ip6_address_t link_local_address;
4176
4177                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4178
4179                   ip6_link_local_address_from_ethernet_mac_address
4180                     (&link_local_address, eth_if0->address);
4181
4182                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
4183                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB ||
4184                       sw_if0->type == VNET_SW_INTERFACE_TYPE_PIPE ||
4185                       sw_if0->type == VNET_SW_INTERFACE_TYPE_P2P)
4186                     {
4187                       /* make up  an interface id */
4188                       link_local_address.as_u64[1] =
4189                         random_u64 (&radv_info->randomizer);
4190
4191                       link_local_address.as_u64[0] =
4192                         clib_host_to_net_u64 (0xFE80000000000000ULL);
4193                       /* clear u bit */
4194                       link_local_address.as_u8[8] &= 0xfd;
4195                     }
4196                   {
4197                     ip6_ll_prefix_t ilp = {
4198                       .ilp_addr = link_local_address,
4199                       .ilp_sw_if_index = sw_if_index,
4200                     };
4201
4202                     ip6_ll_table_entry_update (&ilp, FIB_ROUTE_PATH_LOCAL);
4203                   }
4204
4205                   /* essentially "enables" ipv6 on this interface */
4206                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
4207                   ip6_sw_interface_enable_disable (sw_if_index, 1);
4208
4209                   if (!error)
4210                     {
4211                       radv_info->link_local_address = link_local_address;
4212                     }
4213                 }
4214             }
4215         }
4216     }
4217   return error;
4218 }
4219
4220 int
4221 ip6_get_ll_address (u32 sw_if_index, ip6_address_t * addr)
4222 {
4223   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4224   ip6_radv_t *radv_info;
4225   u32 ri;
4226
4227   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) <= sw_if_index)
4228     return 0;
4229
4230   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4231
4232   if (ri == ~0)
4233     return 0;
4234
4235   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4236   *addr = radv_info->link_local_address;
4237
4238   return (!0);
4239 }
4240
4241 static clib_error_t *
4242 enable_ip6_interface_cmd (vlib_main_t * vm,
4243                           unformat_input_t * input, vlib_cli_command_t * cmd)
4244 {
4245   vnet_main_t *vnm = vnet_get_main ();
4246   clib_error_t *error = 0;
4247   u32 sw_if_index;
4248
4249   sw_if_index = ~0;
4250
4251   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4252     {
4253       enable_ip6_interface (vm, sw_if_index);
4254     }
4255   else
4256     {
4257       error = clib_error_return (0, "unknown interface\n'",
4258                                  format_unformat_error, input);
4259
4260     }
4261   return error;
4262 }
4263
4264 /*?
4265  * This command is used to enable IPv6 on a given interface.
4266  *
4267  * @cliexpar
4268  * Example of how enable IPv6 on a given interface:
4269  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
4270 ?*/
4271 /* *INDENT-OFF* */
4272 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
4273 {
4274   .path = "enable ip6 interface",
4275   .function = enable_ip6_interface_cmd,
4276   .short_help = "enable ip6 interface <interface>",
4277 };
4278 /* *INDENT-ON* */
4279
4280 static clib_error_t *
4281 disable_ip6_interface_cmd (vlib_main_t * vm,
4282                            unformat_input_t * input, vlib_cli_command_t * cmd)
4283 {
4284   vnet_main_t *vnm = vnet_get_main ();
4285   clib_error_t *error = 0;
4286   u32 sw_if_index;
4287
4288   sw_if_index = ~0;
4289
4290   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4291     {
4292       error = disable_ip6_interface (vm, sw_if_index);
4293     }
4294   else
4295     {
4296       error = clib_error_return (0, "unknown interface\n'",
4297                                  format_unformat_error, input);
4298
4299     }
4300   return error;
4301 }
4302
4303 /*?
4304  * This command is used to disable IPv6 on a given interface.
4305  *
4306  * @cliexpar
4307  * Example of how disable IPv6 on a given interface:
4308  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
4309 ?*/
4310 /* *INDENT-OFF* */
4311 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
4312 {
4313   .path = "disable ip6 interface",
4314   .function = disable_ip6_interface_cmd,
4315   .short_help = "disable ip6 interface <interface>",
4316 };
4317 /* *INDENT-ON* */
4318
4319 /*?
4320  * This command is used to configure the neighbor discovery
4321  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
4322  * command to display some of the current neighbor discovery parameters
4323  * on a given interface. This command has three formats:
4324  *
4325  *
4326  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
4327  *
4328  * '<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>'
4329  *
4330  * Where:
4331  *
4332  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
4333  * router-advertisement messages to use stateful address
4334  * auto-configuration to obtain address information (sets the M-bit).
4335  * Default is the M-bit is not set and the '<em>no</em>' option
4336  * returns it to this default state.
4337  *
4338  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
4339  * router-advertisement messages that hosts use stateful auto
4340  * configuration to obtain nonaddress related information (sets
4341  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
4342  * option returns it to this default state.
4343  *
4344  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
4345  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
4346  * router-advertisement messages.
4347  *
4348  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
4349  * optional source link-layer address in the ICMPv6 router-advertisement
4350  * messages. Default is to include the optional source link-layer address
4351  * and the '<em>no</em>' option returns it to this default state.
4352  *
4353  * <em>[no] ra-send-unicast</em> - Use the source address of the
4354  * router-solicitation message if availiable. The default is to use
4355  * multicast address of all nodes, and the '<em>no</em>' option returns
4356  * it to this default state.
4357  *
4358  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
4359  * default router in ICMPv6 router-advertisement messages. The range is
4360  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
4361  * '<em><max-interval></em>'. The default value is 600 seconds and the
4362  * '<em>no</em>' option returns it to this default value.
4363  *
4364  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
4365  * router-advertisement messages sent and the interval between each
4366  * message. Range for count is 1 - 3 and default is 3. Range for interval
4367  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
4368  * returns both to their default value.
4369  *
4370  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
4371  * interval between sending ICMPv6 router-advertisement messages. The
4372  * range for max-interval is from 4 to 200 seconds. min-interval can not
4373  * be more than 75% of max-interval. If not set, min-interval will be
4374  * set to 75% of max-interval. The range for min-interval is from 3 to
4375  * 150 seconds.  The '<em>no</em>' option returns both to their default
4376  * value.
4377  *
4378  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
4379  * The '<em>no</em>' options implies to start (or restart) sending
4380  * ICMPv6 router-advertisement messages.
4381  *
4382  *
4383  * <b>Format 2 - Prefix Options:</b>
4384  *
4385  * '<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>'
4386  *
4387  * Where:
4388  *
4389  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
4390  *
4391  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
4392  * length of time in seconds during what the prefix is valid for the purpose of
4393  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
4394  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
4395  * length of time in seconds during what addresses generated from the prefix remain
4396  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
4397  *
4398  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
4399  * are inifinte, no timeout.
4400  *
4401  * <em>no-advertise</em> - Do not send full router address in prefix
4402  * advertisement. Default is to advertise (i.e. - This flag is off by default).
4403  *
4404  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
4405  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
4406  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
4407  *
4408  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
4409  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
4410  *
4411  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
4412  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
4413  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
4414  * the L-bit.
4415  *
4416  *
4417  * <b>Format 3: - Default of Prefix:</b>
4418  *
4419  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
4420  *
4421  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
4422  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
4423  * is ignored and the prefix is deleted.
4424  *
4425  *
4426  * @cliexpar
4427  * Example of how set a router advertisement option:
4428  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
4429  * Example of how to add a prefix:
4430  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
4431  * Example of how to delete a prefix:
4432  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
4433 ?*/
4434 /* *INDENT-OFF* */
4435 VLIB_CLI_COMMAND (ip6_nd_command, static) =
4436 {
4437   .path = "ip6 nd",
4438   .short_help = "ip6 nd <interface> ...",
4439   .function = ip6_neighbor_cmd,
4440 };
4441 /* *INDENT-ON* */
4442
4443 clib_error_t *
4444 ip6_neighbor_set_link_local_address (vlib_main_t * vm, u32 sw_if_index,
4445                                      ip6_address_t * address)
4446 {
4447   clib_error_t *error = 0;
4448   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4449   u32 ri;
4450   ip6_radv_t *radv_info;
4451   vnet_main_t *vnm = vnet_get_main ();
4452   ip6_ll_prefix_t pfx = { 0, };
4453
4454   if (!ip6_address_is_link_local_unicast (address))
4455     return (error = clib_error_return (0, "address not link-local",
4456                                        format_unformat_error));
4457
4458   /* call enable ipv6  */
4459   enable_ip6_interface (vm, sw_if_index);
4460
4461   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4462
4463   if (ri != ~0)
4464     {
4465       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4466
4467       pfx.ilp_sw_if_index = sw_if_index;
4468
4469       pfx.ilp_addr = radv_info->link_local_address;
4470       ip6_ll_table_entry_delete (&pfx);
4471
4472       pfx.ilp_addr = *address;
4473       ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_LOCAL);
4474
4475       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4476       radv_info->link_local_address = *address;
4477     }
4478   else
4479     {
4480       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
4481       error = clib_error_return (0, "ip6 not enabled for interface",
4482                                  format_unformat_error);
4483     }
4484   return error;
4485 }
4486
4487 /**
4488  * @brief callback when an interface address is added or deleted
4489  */
4490 static void
4491 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
4492                                         uword opaque,
4493                                         u32 sw_if_index,
4494                                         ip6_address_t * address,
4495                                         u32 address_length,
4496                                         u32 if_address_index, u32 is_delete)
4497 {
4498   vnet_main_t *vnm = vnet_get_main ();
4499   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4500   u32 ri;
4501   vlib_main_t *vm = vnm->vlib_main;
4502   ip6_radv_t *radv_info;
4503   ip6_address_t a;
4504
4505   /* create solicited node multicast address for this interface adddress */
4506   ip6_set_solicited_node_multicast_address (&a, 0);
4507
4508   a.as_u8[0xd] = address->as_u8[0xd];
4509   a.as_u8[0xe] = address->as_u8[0xe];
4510   a.as_u8[0xf] = address->as_u8[0xf];
4511
4512   if (!is_delete)
4513     {
4514       /* try to  create radv_info - does nothing if ipv6 already enabled */
4515       enable_ip6_interface (vm, sw_if_index);
4516
4517       /* look up the radv_t  information for this interface */
4518       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4519                                sw_if_index, ~0);
4520       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4521       if (ri != ~0)
4522         {
4523           /* get radv_info */
4524           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4525
4526           /* add address */
4527           if (!ip6_address_is_link_local_unicast (address))
4528             radv_info->ref_count++;
4529
4530           ip6_neighbor_add_mld_prefix (radv_info, &a);
4531         }
4532     }
4533   else
4534     {
4535
4536       /* delete */
4537       /* look up the radv_t  information for this interface */
4538       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4539                                sw_if_index, ~0);
4540       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4541
4542       if (ri != ~0)
4543         {
4544           /* get radv_info */
4545           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4546
4547           ip6_neighbor_del_mld_prefix (radv_info, &a);
4548
4549           /* if interface up send MLDP "report" */
4550           radv_info->all_routers_mcast = 0;
4551
4552           /* add address */
4553           if (!ip6_address_is_link_local_unicast (address))
4554             radv_info->ref_count--;
4555         }
4556       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
4557       disable_ip6_interface (vm, sw_if_index);
4558     }
4559 }
4560
4561 clib_error_t *
4562 ip6_set_neighbor_limit (u32 neighbor_limit)
4563 {
4564   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4565
4566   nm->limit_neighbor_cache_size = neighbor_limit;
4567   return 0;
4568 }
4569
4570 static void
4571 ip6_neighbor_table_bind (ip6_main_t * im,
4572                          uword opaque,
4573                          u32 sw_if_index,
4574                          u32 new_fib_index, u32 old_fib_index)
4575 {
4576   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4577   ip6_neighbor_t *n = NULL;
4578   u32 i, *to_re_add = 0;
4579
4580   /* *INDENT-OFF* */
4581   pool_foreach (n, nm->neighbor_pool,
4582   ({
4583     if (n->key.sw_if_index == sw_if_index)
4584       vec_add1 (to_re_add, n - nm->neighbor_pool);
4585   }));
4586   /* *INDENT-ON* */
4587
4588   for (i = 0; i < vec_len (to_re_add); i++)
4589     {
4590       n = pool_elt_at_index (nm->neighbor_pool, to_re_add[i]);
4591       ip6_neighbor_adj_fib_remove (n, old_fib_index);
4592       ip6_neighbor_adj_fib_add (n, new_fib_index);
4593     }
4594   vec_free (to_re_add);
4595 }
4596
4597 static clib_error_t *
4598 ip6_neighbor_init (vlib_main_t * vm)
4599 {
4600   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4601   ip6_main_t *im = &ip6_main;
4602
4603   mhash_init (&nm->neighbor_index_by_key,
4604               /* value size */ sizeof (uword),
4605               /* key size */ sizeof (ip6_neighbor_key_t));
4606
4607   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
4608                        ip6_icmp_neighbor_solicitation_node.index);
4609   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
4610                        ip6_icmp_neighbor_advertisement_node.index);
4611   icmp6_register_type (vm, ICMP6_router_solicitation,
4612                        ip6_icmp_router_solicitation_node.index);
4613   icmp6_register_type (vm, ICMP6_router_advertisement,
4614                        ip6_icmp_router_advertisement_node.index);
4615
4616   /* handler node for ip6 neighbor discovery events and timers */
4617   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
4618
4619   /* add call backs */
4620   ip6_add_del_interface_address_callback_t cb;
4621   clib_memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
4622
4623   /* when an interface address changes... */
4624   cb.function = ip6_neighbor_add_del_interface_address;
4625   cb.function_opaque = 0;
4626   vec_add1 (im->add_del_interface_address_callbacks, cb);
4627
4628   ip6_table_bind_callback_t cbt;
4629   cbt.function = ip6_neighbor_table_bind;
4630   cbt.function_opaque = 0;
4631   vec_add1 (im->table_bind_callbacks, cbt);
4632
4633   mhash_init (&nm->pending_resolutions_by_address,
4634               /* value size */ sizeof (uword),
4635               /* key size */ sizeof (ip6_address_t));
4636
4637   mhash_init (&nm->mac_changes_by_address,
4638               /* value size */ sizeof (uword),
4639               /* key size */ sizeof (ip6_address_t));
4640
4641   /* default, configurable */
4642   nm->limit_neighbor_cache_size = 50000;
4643
4644   nm->wc_ip6_nd_publisher_node = (uword) ~ 0;
4645
4646   nm->ip6_ra_publisher_node = (uword) ~ 0;
4647
4648 #if 0
4649   /* $$$$ Hack fix for today */
4650   vec_validate_init_empty
4651     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
4652 #endif
4653
4654   return 0;
4655 }
4656
4657 VLIB_INIT_FUNCTION (ip6_neighbor_init);
4658
4659
4660 void
4661 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
4662                                              void *address_arg,
4663                                              uword node_index,
4664                                              uword type_opaque, uword data)
4665 {
4666   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4667   ip6_address_t *address = address_arg;
4668   uword *p;
4669   pending_resolution_t *pr;
4670
4671   pool_get (nm->pending_resolutions, pr);
4672
4673   pr->next_index = ~0;
4674   pr->node_index = node_index;
4675   pr->type_opaque = type_opaque;
4676   pr->data = data;
4677
4678   p = mhash_get (&nm->pending_resolutions_by_address, address);
4679   if (p)
4680     {
4681       /* Insert new resolution at the head of the list */
4682       pr->next_index = p[0];
4683       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
4684     }
4685
4686   mhash_set (&nm->pending_resolutions_by_address, address,
4687              pr - nm->pending_resolutions, 0 /* old value */ );
4688 }
4689
4690 int
4691 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
4692                                   void *data_callback,
4693                                   u32 pid,
4694                                   void *address_arg,
4695                                   uword node_index,
4696                                   uword type_opaque, uword data, int is_add)
4697 {
4698   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4699   ip6_address_t *address = address_arg;
4700
4701   /* Try to find an existing entry */
4702   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
4703   u32 *p = first;
4704   pending_resolution_t *mc;
4705   while (p && *p != ~0)
4706     {
4707       mc = pool_elt_at_index (nm->mac_changes, *p);
4708       if (mc->node_index == node_index && mc->type_opaque == type_opaque
4709           && mc->pid == pid)
4710         break;
4711       p = &mc->next_index;
4712     }
4713
4714   int found = p && *p != ~0;
4715   if (is_add)
4716     {
4717       if (found)
4718         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
4719
4720       pool_get (nm->mac_changes, mc);
4721       /* *INDENT-OFF* */
4722       *mc = (pending_resolution_t)
4723       {
4724         .next_index = ~0,
4725         .node_index = node_index,
4726         .type_opaque = type_opaque,
4727         .data = data,
4728         .data_callback = data_callback,
4729         .pid = pid,
4730       };
4731       /* *INDENT-ON* */
4732
4733       /* Insert new resolution at the end of the list */
4734       u32 new_idx = mc - nm->mac_changes;
4735       if (p)
4736         p[0] = new_idx;
4737       else
4738         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
4739     }
4740   else
4741     {
4742       if (!found)
4743         return VNET_API_ERROR_NO_SUCH_ENTRY;
4744
4745       /* Clients may need to clean up pool entries, too */
4746       void (*fp) (u32, u8 *) = data_callback;
4747       if (fp)
4748         (*fp) (mc->data, 0 /* no new mac addrs */ );
4749
4750       /* Remove the entry from the list and delete the entry */
4751       *p = mc->next_index;
4752       pool_put (nm->mac_changes, mc);
4753
4754       /* Remove from hash if we deleted the last entry */
4755       if (*p == ~0 && p == first)
4756         mhash_unset (&nm->mac_changes_by_address, address, 0);
4757     }
4758   return 0;
4759 }
4760
4761 int
4762 vnet_ip6_nd_term (vlib_main_t * vm,
4763                   vlib_node_runtime_t * node,
4764                   vlib_buffer_t * p0,
4765                   ethernet_header_t * eth,
4766                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4767 {
4768   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4769   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4770
4771   ndh = ip6_next_header (ip);
4772   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4773       ndh->icmp.type != ICMP6_neighbor_advertisement)
4774     return 0;
4775
4776   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4777                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4778     {
4779       u8 *t0 = vlib_add_trace (vm, node, p0,
4780                                sizeof (icmp6_input_trace_t));
4781       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4782     }
4783
4784   /* Check if anyone want ND events for L2 BDs */
4785   if (PREDICT_FALSE
4786       (nm->wc_ip6_nd_publisher_node != (uword) ~ 0
4787        && !ip6_address_is_link_local_unicast (&ip->src_address)))
4788     {
4789       vnet_nd_wc_publish (sw_if_index, eth->src_address, &ip->src_address);
4790     }
4791
4792   /* Check if MAC entry exsist for solicited target IP */
4793   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4794     {
4795       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4796       l2_bridge_domain_t *bd_config;
4797       u8 *macp;
4798
4799       opt = (void *) (ndh + 1);
4800       if ((opt->header.type !=
4801            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4802           (opt->header.n_data_u64s != 1))
4803         return 0;               /* source link layer address option not present */
4804
4805       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4806       macp =
4807         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4808       if (macp)
4809         {                       /* found ip-mac entry, generate eighbor advertisement response */
4810           int bogus_length;
4811           vlib_node_runtime_t *error_node =
4812             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4813           ip->dst_address = ip->src_address;
4814           ip->src_address = ndh->target_address;
4815           ip->hop_limit = 255;
4816           opt->header.type =
4817             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4818           clib_memcpy (opt->ethernet_address, macp, 6);
4819           ndh->icmp.type = ICMP6_neighbor_advertisement;
4820           ndh->advertisement_flags = clib_host_to_net_u32
4821             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4822              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4823           ndh->icmp.checksum = 0;
4824           ndh->icmp.checksum =
4825             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4826           clib_memcpy (eth->dst_address, eth->src_address, 6);
4827           clib_memcpy (eth->src_address, macp, 6);
4828           vlib_error_count (vm, error_node->node_index,
4829                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4830           return 1;
4831         }
4832     }
4833
4834   return 0;
4835
4836 }
4837
4838 int
4839 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4840 {
4841   u32 fib_index;
4842
4843   fib_prefix_t pfx = {
4844     .fp_len = 128,
4845     .fp_proto = FIB_PROTOCOL_IP6,
4846     .fp_addr = {
4847                 .ip6 = *addr,
4848                 },
4849   };
4850   ip46_address_t nh = {
4851     .ip6 = *addr,
4852   };
4853
4854   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4855
4856   if (~0 == fib_index)
4857     return VNET_API_ERROR_NO_SUCH_FIB;
4858
4859   if (is_del)
4860     {
4861       fib_table_entry_path_remove (fib_index,
4862                                    &pfx,
4863                                    FIB_SOURCE_IP6_ND_PROXY,
4864                                    DPO_PROTO_IP6,
4865                                    &nh,
4866                                    sw_if_index,
4867                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4868       /* flush the ND cache of this address if it's there */
4869       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (), sw_if_index, addr);
4870     }
4871   else
4872     {
4873       fib_table_entry_path_add (fib_index,
4874                                 &pfx,
4875                                 FIB_SOURCE_IP6_ND_PROXY,
4876                                 FIB_ENTRY_FLAG_NONE,
4877                                 DPO_PROTO_IP6,
4878                                 &nh,
4879                                 sw_if_index,
4880                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4881     }
4882   return (0);
4883 }
4884
4885 static clib_error_t *
4886 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4887                       unformat_input_t * input, vlib_cli_command_t * cmd)
4888 {
4889   vnet_main_t *vnm = vnet_get_main ();
4890   clib_error_t *error = 0;
4891   ip6_address_t addr;
4892   u32 sw_if_index;
4893   u8 is_del = 0;
4894
4895   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4896     {
4897       /* get the rest of the command */
4898       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4899         {
4900           if (unformat (input, "%U", unformat_ip6_address, &addr))
4901             break;
4902           else if (unformat (input, "delete") || unformat (input, "del"))
4903             is_del = 1;
4904           else
4905             return (unformat_parse_error (input));
4906         }
4907     }
4908
4909   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4910
4911   return error;
4912 }
4913
4914 /* *INDENT-OFF* */
4915 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4916 {
4917   .path = "set ip6 nd proxy",
4918   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4919   .function = set_ip6_nd_proxy_cmd,
4920 };
4921 /* *INDENT-ON* */
4922
4923 void
4924 ethernet_ndp_change_mac (u32 sw_if_index)
4925 {
4926   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4927   ip6_neighbor_t *n;
4928   adj_index_t ai;
4929
4930   /* *INDENT-OFF* */
4931   pool_foreach (n, nm->neighbor_pool,
4932   ({
4933     if (n->key.sw_if_index == sw_if_index)
4934       {
4935         adj_nbr_walk_nh6 (sw_if_index,
4936                           &n->key.ip6_address,
4937                           ip6_nd_mk_complete_walk, n);
4938       }
4939   }));
4940   /* *INDENT-ON* */
4941
4942   ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index);
4943
4944   if (ADJ_INDEX_INVALID != ai)
4945     adj_glean_update_rewrite (ai);
4946 }
4947
4948 void
4949 send_ip6_na (vlib_main_t * vm, u32 sw_if_index)
4950 {
4951   ip6_main_t *i6m = &ip6_main;
4952   ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index);
4953
4954   send_ip6_na_w_addr (vm, ip6_addr, sw_if_index);
4955 }
4956
4957 void
4958 send_ip6_na_w_addr (vlib_main_t * vm,
4959                     const ip6_address_t * ip6_addr, u32 sw_if_index)
4960 {
4961   ip6_main_t *i6m = &ip6_main;
4962   vnet_main_t *vnm = vnet_get_main ();
4963   u8 *rewrite, rewrite_len;
4964   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
4965   u8 dst_address[6];
4966
4967   if (ip6_addr)
4968     {
4969       clib_warning
4970         ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
4971          format_ip6_address, ip6_addr, sw_if_index);
4972
4973       /* Form unsolicited neighbor advertisement packet from NS pkt template */
4974       int bogus_length;
4975       u32 bi = 0;
4976       icmp6_neighbor_solicitation_header_t *h =
4977         vlib_packet_template_get_packet (vm,
4978                                          &i6m->discover_neighbor_packet_template,
4979                                          &bi);
4980       if (!h)
4981         return;
4982
4983       ip6_set_reserved_multicast_address (&h->ip.dst_address,
4984                                           IP6_MULTICAST_SCOPE_link_local,
4985                                           IP6_MULTICAST_GROUP_ID_all_hosts);
4986       h->ip.src_address = ip6_addr[0];
4987       h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
4988       h->neighbor.target_address = ip6_addr[0];
4989       h->neighbor.advertisement_flags = clib_host_to_net_u32
4990         (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4991       h->link_layer_option.header.type =
4992         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4993       clib_memcpy (h->link_layer_option.ethernet_address,
4994                    hi->hw_address, vec_len (hi->hw_address));
4995       h->neighbor.icmp.checksum =
4996         ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
4997       ASSERT (bogus_length == 0);
4998
4999       /* Setup MAC header with IP6 Etype and mcast DMAC */
5000       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
5001       ip6_multicast_ethernet_address (dst_address,
5002                                       IP6_MULTICAST_GROUP_ID_all_hosts);
5003       rewrite =
5004         ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address);
5005       rewrite_len = vec_len (rewrite);
5006       vlib_buffer_advance (b, -rewrite_len);
5007       ethernet_header_t *e = vlib_buffer_get_current (b);
5008       clib_memcpy (e->dst_address, rewrite, rewrite_len);
5009       vec_free (rewrite);
5010
5011       /* Send unsolicited ND advertisement packet out the specified interface */
5012       vnet_buffer (b)->sw_if_index[VLIB_RX] =
5013         vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
5014       vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
5015       u32 *to_next = vlib_frame_vector_args (f);
5016       to_next[0] = bi;
5017       f->n_vectors = 1;
5018       vlib_put_frame_to_node (vm, hi->output_node_index, f);
5019     }
5020 }
5021
5022 /*
5023  * fd.io coding-style-patch-verification: ON
5024  *
5025  * Local Variables:
5026  * eval: (c-set-style "gnu")
5027  * End:
5028  */