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, vlib_buffer_get_free_list_index
1695                            (p0), &bi0, (void *) &rh,
1696                            sizeof (icmp6_router_advertisement_header_t)))
1697                         {
1698                           /* buffer allocation failed, drop the pkt */
1699                           error0 = ICMP6_ERROR_ALLOC_FAILURE;
1700                           goto drop0;
1701                         }
1702
1703                       if (radv_info->adv_link_layer_address)
1704                         {
1705                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1706                             h;
1707
1708                           h.header.type =
1709                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1710                           h.header.n_data_u64s = 1;
1711
1712                           /* copy ll address */
1713                           clib_memcpy (&h.ethernet_address[0],
1714                                        eth_if0->address, 6);
1715
1716                           if (vlib_buffer_add_data
1717                               (vm, vlib_buffer_get_free_list_index
1718                                (p0), &bi0, (void *) &h,
1719                                sizeof
1720                                (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
1721                             {
1722                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1723                               goto drop0;
1724                             }
1725
1726                           payload_length +=
1727                             sizeof
1728                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1729                         }
1730
1731                       /* add MTU option */
1732                       if (radv_info->adv_link_mtu)
1733                         {
1734                           icmp6_neighbor_discovery_mtu_option_t h;
1735
1736                           h.unused = 0;
1737                           h.mtu =
1738                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1739                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1740                           h.header.n_data_u64s = 1;
1741
1742                           payload_length +=
1743                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1744
1745                           if (vlib_buffer_add_data
1746                               (vm, vlib_buffer_get_free_list_index
1747                                (p0), &bi0, (void *) &h,
1748                                sizeof
1749                                (icmp6_neighbor_discovery_mtu_option_t)))
1750                             {
1751                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1752                               goto drop0;
1753                             }
1754                         }
1755
1756                       /* add advertised prefix options  */
1757                       ip6_radv_prefix_t *pr_info;
1758
1759                       /* *INDENT-OFF* */
1760                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1761                       ({
1762                         if(pr_info->enabled &&
1763                            (!pr_info->decrement_lifetime_flag
1764                             || (pr_info->pref_lifetime_expires >0)))
1765                           {
1766                             /* advertise this prefix */
1767                             icmp6_neighbor_discovery_prefix_information_option_t h;
1768
1769                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1770                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1771
1772                             h.dst_address_length  = pr_info->prefix_len;
1773
1774                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1775                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1776
1777                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1778                               {
1779                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1780                                 h.preferred_time  = 0;
1781                               }
1782                             else
1783                               {
1784                                 if(pr_info->decrement_lifetime_flag)
1785                                   {
1786                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1787                                       (pr_info->valid_lifetime_expires  - now) : 0;
1788
1789                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1790                                       (pr_info->pref_lifetime_expires  - now) : 0;
1791                                   }
1792
1793                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1794                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1795                               }
1796                             h.unused  = 0;
1797
1798                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1799
1800                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1801
1802                             if (vlib_buffer_add_data
1803                                 (vm, vlib_buffer_get_free_list_index (p0),
1804                                  &bi0,
1805                                  (void *)&h,
1806                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
1807                               {
1808                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
1809                                 goto drop0;
1810                               }
1811
1812                           }
1813                       }));
1814                       /* *INDENT-ON* */
1815
1816                       /* add additional options before here */
1817
1818                       /* finish building the router advertisement... */
1819                       if (!is_unspecified && radv_info->send_unicast)
1820                         {
1821                           ip0->dst_address = ip0->src_address;
1822                         }
1823                       else
1824                         {
1825                           /* target address is all-nodes mcast addr */
1826                           ip6_set_reserved_multicast_address
1827                             (&ip0->dst_address,
1828                              IP6_MULTICAST_SCOPE_link_local,
1829                              IP6_MULTICAST_GROUP_ID_all_hosts);
1830                         }
1831
1832                       /* source address MUST be the link-local address */
1833                       ip0->src_address = radv_info->link_local_address;
1834
1835                       ip0->hop_limit = 255;
1836                       ip0->payload_length =
1837                         clib_host_to_net_u16 (payload_length);
1838
1839                       icmp6_router_advertisement_header_t *rh0 =
1840                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1841                       rh0->icmp.checksum =
1842                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1843                                                            &bogus_length);
1844                       ASSERT (bogus_length == 0);
1845
1846                       /* setup output if and adjacency */
1847                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1848                         vnet_main.local_interface_sw_if_index;
1849
1850                       if (is_solicitation)
1851                         {
1852                           ethernet_header_t *eth0;
1853                           /* Reuse current MAC header, copy SMAC to DMAC and
1854                            * interface MAC to SMAC */
1855                           vlib_buffer_reset (p0);
1856                           eth0 = vlib_buffer_get_current (p0);
1857                           clib_memcpy (eth0->dst_address, eth0->src_address,
1858                                        6);
1859                           clib_memcpy (eth0->src_address, eth_if0->address,
1860                                        6);
1861                           next0 =
1862                             is_dropped ? next0 :
1863                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1864                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1865                             sw_if_index0;
1866                         }
1867                       else
1868                         {
1869                           adj_index0 = radv_info->mcast_adj_index;
1870                           if (adj_index0 == 0)
1871                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1872                           else
1873                             {
1874                               next0 =
1875                                 is_dropped ? next0 :
1876                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1877                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1878                                 adj_index0;
1879                             }
1880                         }
1881                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1882
1883                       radv_info->n_solicitations_dropped += is_dropped;
1884                       radv_info->n_solicitations_rcvd += is_solicitation;
1885
1886                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1887                         {
1888                           radv_info->n_advertisements_sent++;
1889                           n_advertisements_sent++;
1890                         }
1891                     }
1892                 }
1893             }
1894
1895         drop0:
1896           p0->error = error_node->errors[error0];
1897
1898           if (error0 != ICMP6_ERROR_NONE)
1899             vlib_error_count (vm, error_node->node_index, error0, 1);
1900
1901           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1902                                            to_next, n_left_to_next,
1903                                            bi0, next0);
1904
1905         }
1906
1907       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1908     }
1909
1910   /* Account for router advertisements sent. */
1911   vlib_error_count (vm, error_node->node_index,
1912                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1913                     n_advertisements_sent);
1914
1915   return frame->n_vectors;
1916 }
1917
1918  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1919 static_always_inline uword
1920 icmp6_router_advertisement (vlib_main_t * vm,
1921                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1922 {
1923   vnet_main_t *vnm = vnet_get_main ();
1924   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1925   uword n_packets = frame->n_vectors;
1926   u32 *from, *to_next;
1927   u32 n_left_from, n_left_to_next, next_index;
1928   u32 n_advertisements_rcvd = 0;
1929
1930   vlib_node_runtime_t *error_node =
1931     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1932
1933   from = vlib_frame_vector_args (frame);
1934   n_left_from = n_packets;
1935   next_index = node->cached_next_index;
1936
1937   if (node->flags & VLIB_NODE_FLAG_TRACE)
1938     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1939                                    /* stride */ 1,
1940                                    sizeof (icmp6_input_trace_t));
1941
1942   while (n_left_from > 0)
1943     {
1944       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1945
1946       while (n_left_from > 0 && n_left_to_next > 0)
1947         {
1948           vlib_buffer_t *p0;
1949           ip6_header_t *ip0;
1950           ip6_radv_t *radv_info = 0;
1951           icmp6_router_advertisement_header_t *h0;
1952           u32 bi0, options_len0, sw_if_index0, next0, error0;
1953
1954           bi0 = to_next[0] = from[0];
1955
1956           from += 1;
1957           to_next += 1;
1958           n_left_from -= 1;
1959           n_left_to_next -= 1;
1960
1961           p0 = vlib_get_buffer (vm, bi0);
1962           ip0 = vlib_buffer_get_current (p0);
1963           h0 = ip6_next_header (ip0);
1964           options_len0 =
1965             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1966
1967           error0 = ICMP6_ERROR_NONE;
1968           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1969
1970           /* Check that source address is link-local */
1971           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1972             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1973
1974           /* default is to drop */
1975           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1976
1977           n_advertisements_rcvd++;
1978
1979           if (error0 == ICMP6_ERROR_NONE)
1980             {
1981               vnet_sw_interface_t *sw_if0;
1982               ethernet_interface_t *eth_if0;
1983
1984               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1985               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1986               eth_if0 =
1987                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1988
1989               /* only support ethernet interface type for now */
1990               error0 =
1991                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1992                 : error0;
1993
1994               if (error0 == ICMP6_ERROR_NONE)
1995                 {
1996                   u32 ri;
1997
1998                   /* look up the radv_t information for this interface */
1999                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
2000                       sw_if_index0)
2001                     {
2002                       ri =
2003                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
2004
2005                       if (ri != ~0)
2006                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2007                     }
2008
2009                   error0 =
2010                     ((!radv_info) ?
2011                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
2012                      error0);
2013
2014                   if (error0 == ICMP6_ERROR_NONE)
2015                     {
2016                       radv_info->keep_sending_rs = 0;
2017
2018                       ra_report_t r;
2019
2020                       r.sw_if_index = sw_if_index0;
2021                       memcpy (r.router_address, &ip0->src_address, 16);
2022                       r.current_hop_limit = h0->current_hop_limit;
2023                       r.flags = h0->flags;
2024                       r.router_lifetime_in_sec =
2025                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
2026                       r.neighbor_reachable_time_in_msec =
2027                         clib_net_to_host_u32
2028                         (h0->neighbor_reachable_time_in_msec);
2029                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
2030                       r.prefixes = 0;
2031
2032                       /* validate advertised information */
2033                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
2034                           && (h0->current_hop_limit !=
2035                               radv_info->curr_hop_limit))
2036                         {
2037                           ip6_neighbor_syslog (vm, LOG_WARNING,
2038                                                "our AdvCurHopLimit on %U doesn't agree with %U",
2039                                                format_vnet_sw_if_index_name,
2040                                                vnm, sw_if_index0,
2041                                                format_ip6_address,
2042                                                &ip0->src_address);
2043                         }
2044
2045                       if ((h0->flags &
2046                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
2047                           != radv_info->adv_managed_flag)
2048                         {
2049                           ip6_neighbor_syslog (vm, LOG_WARNING,
2050                                                "our AdvManagedFlag on %U doesn't agree with %U",
2051                                                format_vnet_sw_if_index_name,
2052                                                vnm, sw_if_index0,
2053                                                format_ip6_address,
2054                                                &ip0->src_address);
2055                         }
2056
2057                       if ((h0->flags &
2058                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
2059                           != radv_info->adv_other_flag)
2060                         {
2061                           ip6_neighbor_syslog (vm, LOG_WARNING,
2062                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
2063                                                format_vnet_sw_if_index_name,
2064                                                vnm, sw_if_index0,
2065                                                format_ip6_address,
2066                                                &ip0->src_address);
2067                         }
2068
2069                       if ((h0->
2070                            time_in_msec_between_retransmitted_neighbor_solicitations
2071                            && radv_info->
2072                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
2073                           && (h0->
2074                               time_in_msec_between_retransmitted_neighbor_solicitations
2075                               !=
2076                               clib_host_to_net_u32 (radv_info->
2077                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
2078                         {
2079                           ip6_neighbor_syslog (vm, LOG_WARNING,
2080                                                "our AdvRetransTimer on %U doesn't agree with %U",
2081                                                format_vnet_sw_if_index_name,
2082                                                vnm, sw_if_index0,
2083                                                format_ip6_address,
2084                                                &ip0->src_address);
2085                         }
2086
2087                       if ((h0->neighbor_reachable_time_in_msec &&
2088                            radv_info->adv_neighbor_reachable_time_in_msec) &&
2089                           (h0->neighbor_reachable_time_in_msec !=
2090                            clib_host_to_net_u32
2091                            (radv_info->adv_neighbor_reachable_time_in_msec)))
2092                         {
2093                           ip6_neighbor_syslog (vm, LOG_WARNING,
2094                                                "our AdvReachableTime on %U doesn't agree with %U",
2095                                                format_vnet_sw_if_index_name,
2096                                                vnm, sw_if_index0,
2097                                                format_ip6_address,
2098                                                &ip0->src_address);
2099                         }
2100
2101                       /* check for MTU or prefix options or .. */
2102                       u8 *opt_hdr = (u8 *) (h0 + 1);
2103                       while (options_len0 > 0)
2104                         {
2105                           icmp6_neighbor_discovery_option_header_t *o0 =
2106                             (icmp6_neighbor_discovery_option_header_t *)
2107                             opt_hdr;
2108                           int opt_len = o0->n_data_u64s << 3;
2109                           icmp6_neighbor_discovery_option_type_t option_type =
2110                             o0->type;
2111
2112                           if (options_len0 < 2)
2113                             {
2114                               ip6_neighbor_syslog (vm, LOG_ERR,
2115                                                    "malformed RA packet on %U from %U",
2116                                                    format_vnet_sw_if_index_name,
2117                                                    vnm, sw_if_index0,
2118                                                    format_ip6_address,
2119                                                    &ip0->src_address);
2120                               break;
2121                             }
2122
2123                           if (opt_len == 0)
2124                             {
2125                               ip6_neighbor_syslog (vm, LOG_ERR,
2126                                                    " zero length option in RA on %U from %U",
2127                                                    format_vnet_sw_if_index_name,
2128                                                    vnm, sw_if_index0,
2129                                                    format_ip6_address,
2130                                                    &ip0->src_address);
2131                               break;
2132                             }
2133                           else if (opt_len > options_len0)
2134                             {
2135                               ip6_neighbor_syslog (vm, LOG_ERR,
2136                                                    "option length in RA packet  greater than total length on %U from %U",
2137                                                    format_vnet_sw_if_index_name,
2138                                                    vnm, sw_if_index0,
2139                                                    format_ip6_address,
2140                                                    &ip0->src_address);
2141                               break;
2142                             }
2143
2144                           options_len0 -= opt_len;
2145                           opt_hdr += opt_len;
2146
2147                           switch (option_type)
2148                             {
2149                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
2150                               {
2151                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2152                                   * h =
2153                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2154                                    *) (o0);
2155
2156                                 if (opt_len < sizeof (*h))
2157                                   break;
2158
2159                                 memcpy (r.slla, h->ethernet_address, 6);
2160                               }
2161                               break;
2162
2163                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
2164                               {
2165                                 icmp6_neighbor_discovery_mtu_option_t *h =
2166                                   (icmp6_neighbor_discovery_mtu_option_t
2167                                    *) (o0);
2168
2169                                 if (opt_len < sizeof (*h))
2170                                   break;
2171
2172                                 r.mtu = clib_net_to_host_u32 (h->mtu);
2173
2174                                 if ((h->mtu && radv_info->adv_link_mtu) &&
2175                                     (h->mtu !=
2176                                      clib_host_to_net_u32
2177                                      (radv_info->adv_link_mtu)))
2178                                   {
2179                                     ip6_neighbor_syslog (vm, LOG_WARNING,
2180                                                          "our AdvLinkMTU on %U doesn't agree with %U",
2181                                                          format_vnet_sw_if_index_name,
2182                                                          vnm, sw_if_index0,
2183                                                          format_ip6_address,
2184                                                          &ip0->src_address);
2185                                   }
2186                               }
2187                               break;
2188
2189                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
2190                               {
2191                                 icmp6_neighbor_discovery_prefix_information_option_t
2192                                   * h =
2193                                   (icmp6_neighbor_discovery_prefix_information_option_t
2194                                    *) (o0);
2195
2196                                 /* validate advertised prefix options  */
2197                                 ip6_radv_prefix_t *pr_info;
2198                                 u32 preferred, valid;
2199
2200                                 if (opt_len < sizeof (*h))
2201                                   break;
2202
2203                                 vec_validate (r.prefixes,
2204                                               vec_len (r.prefixes));
2205                                 ra_report_prefix_info_t *prefix =
2206                                   vec_elt_at_index (r.prefixes,
2207                                                     vec_len (r.prefixes) - 1);
2208
2209                                 preferred =
2210                                   clib_net_to_host_u32 (h->preferred_time);
2211                                 valid = clib_net_to_host_u32 (h->valid_time);
2212
2213                                 prefix->preferred_time = preferred;
2214                                 prefix->valid_time = valid;
2215                                 prefix->flags = h->flags & 0xc0;
2216                                 prefix->dst_address_length =
2217                                   h->dst_address_length;
2218                                 prefix->dst_address = h->dst_address;
2219
2220                                 /* look for matching prefix - if we our advertising it, it better be consistant */
2221                                 /* *INDENT-OFF* */
2222                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
2223                                 ({
2224
2225                                   ip6_address_t mask;
2226                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
2227
2228                                   if(pr_info->enabled &&
2229                                      (pr_info->prefix_len == h->dst_address_length) &&
2230                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
2231                                     {
2232                                       /* found it */
2233                                       if(!pr_info->decrement_lifetime_flag &&
2234                                          valid != pr_info->adv_valid_lifetime_in_secs)
2235                                         {
2236                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2237                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
2238                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2239                                                               format_ip6_address, &h->dst_address);
2240                                         }
2241                                       if(!pr_info->decrement_lifetime_flag &&
2242                                          preferred != pr_info->adv_pref_lifetime_in_secs)
2243                                         {
2244                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2245                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
2246                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2247                                                               format_ip6_address, &h->dst_address);
2248                                         }
2249                                     }
2250                                   break;
2251                                 }));
2252                                 /* *INDENT-ON* */
2253                                 break;
2254                               }
2255                             default:
2256                               /* skip this one */
2257                               break;
2258                             }
2259                         }
2260                       ra_publish (&r);
2261                     }
2262                 }
2263             }
2264
2265           p0->error = error_node->errors[error0];
2266
2267           if (error0 != ICMP6_ERROR_NONE)
2268             vlib_error_count (vm, error_node->node_index, error0, 1);
2269
2270           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2271                                            to_next, n_left_to_next,
2272                                            bi0, next0);
2273         }
2274
2275       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2276     }
2277
2278   /* Account for router advertisements received. */
2279   vlib_error_count (vm, error_node->node_index,
2280                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2281                     n_advertisements_rcvd);
2282
2283   return frame->n_vectors;
2284 }
2285
2286 static inline f64
2287 random_f64_from_to (f64 from, f64 to)
2288 {
2289   static u32 seed = 0;
2290   static u8 seed_set = 0;
2291   if (!seed_set)
2292     {
2293       seed = random_default_seed ();
2294       seed_set = 1;
2295     }
2296   return random_f64 (&seed) * (to - from) + from;
2297 }
2298
2299 static inline u8
2300 get_mac_address (u32 sw_if_index, u8 * address)
2301 {
2302   vnet_main_t *vnm = vnet_get_main ();
2303   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
2304   if (!hw_if->hw_address)
2305     return 1;
2306   clib_memcpy (address, hw_if->hw_address, 6);
2307   return 0;
2308 }
2309
2310 static inline vlib_buffer_t *
2311 create_buffer_for_rs (vlib_main_t * vm, ip6_radv_t * radv_info)
2312 {
2313   u32 bi0;
2314   vlib_buffer_t *p0;
2315   vlib_buffer_free_list_t *fl;
2316   icmp6_router_solicitation_header_t *rh;
2317   u16 payload_length;
2318   int bogus_length;
2319   u32 sw_if_index;
2320
2321   sw_if_index = radv_info->sw_if_index;
2322
2323   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
2324     {
2325       clib_warning ("buffer allocation failure");
2326       return 0;
2327     }
2328
2329   p0 = vlib_get_buffer (vm, bi0);
2330   fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2331   vlib_buffer_init_for_free_list (p0, fl);
2332   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
2333   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2334
2335   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
2336   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
2337
2338   vnet_buffer (p0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2339
2340   rh = vlib_buffer_get_current (p0);
2341   p0->current_length = sizeof (*rh);
2342
2343   rh->neighbor.icmp.type = ICMP6_router_solicitation;
2344   rh->neighbor.icmp.code = 0;
2345   rh->neighbor.icmp.checksum = 0;
2346   rh->neighbor.reserved_must_be_zero = 0;
2347
2348   rh->link_layer_option.header.type =
2349     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2350   if (0 != get_mac_address (sw_if_index,
2351                             rh->link_layer_option.ethernet_address))
2352     {
2353       clib_warning ("interface with sw_if_index %u has no mac address",
2354                     sw_if_index);
2355       vlib_buffer_free (vm, &bi0, 1);
2356       return 0;
2357     }
2358   rh->link_layer_option.header.n_data_u64s = 1;
2359
2360   payload_length = sizeof (rh->neighbor) + sizeof (u64);
2361
2362   rh->ip.ip_version_traffic_class_and_flow_label =
2363     clib_host_to_net_u32 (0x6 << 28);
2364   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
2365   rh->ip.protocol = IP_PROTOCOL_ICMP6;
2366   rh->ip.hop_limit = 255;
2367   rh->ip.src_address = radv_info->link_local_address;
2368   /* set address ff02::2 */
2369   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
2370   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
2371
2372   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
2373                                                                   &rh->ip,
2374                                                                   &bogus_length);
2375
2376   return p0;
2377 }
2378
2379 static inline void
2380 stop_sending_rs (vlib_main_t * vm, ip6_radv_t * ra)
2381 {
2382   u32 bi0;
2383
2384   ra->keep_sending_rs = 0;
2385   if (ra->buffer)
2386     {
2387       bi0 = vlib_get_buffer_index (vm, ra->buffer);
2388       vlib_buffer_free (vm, &bi0, 1);
2389       ra->buffer = 0;
2390     }
2391 }
2392
2393 static inline bool
2394 check_send_rs (vlib_main_t * vm, ip6_radv_t * radv_info, f64 current_time,
2395                f64 * due_time)
2396 {
2397   vlib_buffer_t *p0;
2398   vlib_frame_t *f;
2399   u32 *to_next;
2400   u32 next_index;
2401   vlib_buffer_t *c0;
2402   u32 ci0;
2403
2404   icmp6_send_router_solicitation_params_t *params;
2405
2406   if (!radv_info->keep_sending_rs)
2407     return false;
2408
2409   params = &radv_info->params;
2410
2411   if (radv_info->due_time > current_time)
2412     {
2413       *due_time = radv_info->due_time;
2414       return true;
2415     }
2416
2417   p0 = radv_info->buffer;
2418
2419   next_index = ip6_rewrite_mcast_node.index;
2420
2421   c0 = vlib_buffer_copy (vm, p0);
2422   ci0 = vlib_get_buffer_index (vm, c0);
2423
2424   f = vlib_get_frame_to_node (vm, next_index);
2425   to_next = vlib_frame_vector_args (f);
2426   to_next[0] = ci0;
2427   f->n_vectors = 1;
2428   vlib_put_frame_to_node (vm, next_index, f);
2429
2430   if (params->mrc != 0 && --radv_info->n_left == 0)
2431     stop_sending_rs (vm, radv_info);
2432   else
2433     {
2434       radv_info->sleep_interval =
2435         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
2436       if (radv_info->sleep_interval > params->mrt)
2437         radv_info->sleep_interval =
2438           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
2439
2440       radv_info->due_time = current_time + radv_info->sleep_interval;
2441
2442       if (params->mrd != 0
2443           && current_time > radv_info->start_time + params->mrd)
2444         stop_sending_rs (vm, radv_info);
2445       else
2446         *due_time = radv_info->due_time;
2447     }
2448
2449   return radv_info->keep_sending_rs;
2450 }
2451
2452 static uword
2453 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
2454                  vlib_frame_t * f0)
2455 {
2456   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2457   ip6_radv_t *radv_info;
2458   uword *event_data = 0;
2459   f64 sleep_time = 1e9;
2460   f64 current_time;
2461   f64 due_time;
2462   f64 dt = 0;
2463
2464   while (true)
2465     {
2466       vlib_process_wait_for_event_or_clock (vm, sleep_time);
2467       vlib_process_get_events (vm, &event_data);
2468       vec_reset_length (event_data);
2469
2470       current_time = vlib_time_now (vm);
2471       do
2472         {
2473           due_time = current_time + 1e9;
2474         /* *INDENT-OFF* */
2475         pool_foreach (radv_info, nm->if_radv_pool,
2476         ({
2477             if (check_send_rs (vm, radv_info, current_time, &dt)
2478                 && (dt < due_time))
2479               due_time = dt;
2480         }));
2481         /* *INDENT-ON* */
2482           current_time = vlib_time_now (vm);
2483         }
2484       while (due_time < current_time);
2485
2486       sleep_time = due_time - current_time;
2487     }
2488
2489   return 0;
2490 }
2491
2492 /* *INDENT-OFF* */
2493 VLIB_REGISTER_NODE (send_rs_process_node) = {
2494     .function = send_rs_process,
2495     .type = VLIB_NODE_TYPE_PROCESS,
2496     .name = "send-rs-process",
2497 };
2498 /* *INDENT-ON* */
2499
2500 void
2501 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
2502                                 icmp6_send_router_solicitation_params_t *
2503                                 params)
2504 {
2505   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2506   u32 rai;
2507   ip6_radv_t *ra = 0;
2508
2509   ASSERT (~0 != sw_if_index);
2510
2511   rai = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2512   ra = pool_elt_at_index (nm->if_radv_pool, rai);
2513
2514   stop_sending_rs (vm, ra);
2515
2516   if (!stop)
2517     {
2518       ra->keep_sending_rs = 1;
2519       ra->params = *params;
2520       ra->n_left = params->mrc;
2521       ra->start_time = vlib_time_now (vm);
2522       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
2523       ra->due_time = 0;         /* send first packet ASAP */
2524       ra->buffer = create_buffer_for_rs (vm, ra);
2525       if (!ra->buffer)
2526         ra->keep_sending_rs = 0;
2527       else
2528         vlib_process_signal_event (vm, send_rs_process_node.index, 1, 0);
2529     }
2530 }
2531
2532 /**
2533  * @brief Add a multicast Address to the advertised MLD set
2534  */
2535 static void
2536 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2537 {
2538   ip6_mldp_group_t *mcast_group_info;
2539   uword *p;
2540
2541   /* lookup  mldp info for this interface */
2542   p = mhash_get (&radv_info->address_to_mldp_index, addr);
2543   mcast_group_info =
2544     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2545
2546   /* add address */
2547   if (!mcast_group_info)
2548     {
2549       /* add */
2550       u32 mi;
2551       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2552
2553       mi = mcast_group_info - radv_info->mldp_group_pool;
2554       mhash_set (&radv_info->address_to_mldp_index, addr, mi,   /* old_value */
2555                  0);
2556
2557       mcast_group_info->type = 4;
2558       mcast_group_info->mcast_source_address_pool = 0;
2559       mcast_group_info->num_sources = 0;
2560       clib_memcpy (&mcast_group_info->mcast_address, addr,
2561                    sizeof (ip6_address_t));
2562     }
2563 }
2564
2565 /**
2566  * @brief Delete a multicast Address from the advertised MLD set
2567  */
2568 static void
2569 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2570 {
2571   ip6_mldp_group_t *mcast_group_info;
2572   uword *p;
2573
2574   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2575   mcast_group_info =
2576     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2577
2578   if (mcast_group_info)
2579     {
2580       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2581                    /* old_value */ 0);
2582       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2583     }
2584 }
2585
2586 /**
2587  * @brief Add a multicast Address to the advertised MLD set
2588  */
2589 static void
2590 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2591                           ip6_multicast_address_scope_t scope,
2592                           ip6_multicast_link_local_group_id_t group)
2593 {
2594   ip6_address_t addr;
2595
2596   ip6_set_reserved_multicast_address (&addr, scope, group);
2597
2598   ip6_neighbor_add_mld_prefix (a, &addr);
2599 }
2600
2601 /**
2602  * @brief create and initialize router advertisement parameters with default
2603  * values for this intfc
2604  */
2605 u32
2606 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2607                                    u32 sw_if_index, u32 is_add)
2608 {
2609   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2610   ip6_radv_t *a = 0;
2611   u32 ri = ~0;
2612   vnet_sw_interface_t *sw_if0;
2613   ethernet_interface_t *eth_if0 = 0;
2614
2615   /* lookup radv container  - ethernet interfaces only */
2616   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2617   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2618     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2619
2620   if (!eth_if0)
2621     return ri;
2622
2623   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2624                            ~0);
2625   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2626
2627   if (ri != ~0)
2628     {
2629       a = pool_elt_at_index (nm->if_radv_pool, ri);
2630
2631       if (!is_add)
2632         {
2633           ip6_radv_prefix_t *p;
2634           ip6_mldp_group_t *m;
2635
2636           /* release the lock on the interface's mcast adj */
2637           adj_unlock (a->mcast_adj_index);
2638
2639           /* clean up prefix and MDP pools */
2640           /* *INDENT-OFF* */
2641           pool_flush(p, a->adv_prefixes_pool,
2642           ({
2643               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2644           }));
2645           pool_flush (m, a->mldp_group_pool,
2646           ({
2647               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2648           }));
2649           /* *INDENT-ON* */
2650
2651           pool_free (a->mldp_group_pool);
2652           pool_free (a->adv_prefixes_pool);
2653
2654           mhash_free (&a->address_to_prefix_index);
2655           mhash_free (&a->address_to_mldp_index);
2656
2657           if (a->keep_sending_rs)
2658             a->keep_sending_rs = 0;
2659
2660           pool_put (nm->if_radv_pool, a);
2661           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2662           ri = ~0;
2663         }
2664     }
2665   else
2666     {
2667       if (is_add)
2668         {
2669           pool_get (nm->if_radv_pool, a);
2670
2671           ri = a - nm->if_radv_pool;
2672           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2673
2674           /* initialize default values (most of which are zero) */
2675           clib_memset (a, 0, sizeof (a[0]));
2676
2677           a->sw_if_index = sw_if_index;
2678           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2679           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2680           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2681           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2682
2683           /* send ll address source address option */
2684           a->adv_link_layer_address = 1;
2685
2686           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2687           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2688           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2689           a->seed = (u32) clib_cpu_time_now ();
2690           (void) random_u32 (&a->seed);
2691           a->randomizer = clib_cpu_time_now ();
2692           (void) random_u64 (&a->randomizer);
2693
2694           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2695           a->initial_adverts_sent = a->initial_adverts_count - 1;
2696           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2697
2698           /* deafult is to send */
2699           a->send_radv = 1;
2700
2701           /* fill in radv_info for this interface that will be needed later */
2702           a->adv_link_mtu =
2703             vnet_sw_interface_get_mtu (vnm, sw_if_index, VNET_MTU_IP6);
2704
2705           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2706
2707           /* fill in default link-local address  (this may be overridden) */
2708           ip6_link_local_address_from_ethernet_address
2709             (&a->link_local_address, eth_if0->address);
2710
2711           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2712                       sizeof (ip6_address_t));
2713           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2714                       sizeof (ip6_address_t));
2715
2716           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2717                                                       VNET_LINK_IP6,
2718                                                       sw_if_index);
2719
2720           a->keep_sending_rs = 0;
2721
2722           /* add multicast groups we will always be reporting  */
2723           ip6_neighbor_add_mld_grp (a,
2724                                     IP6_MULTICAST_SCOPE_link_local,
2725                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2726           ip6_neighbor_add_mld_grp (a,
2727                                     IP6_MULTICAST_SCOPE_link_local,
2728                                     IP6_MULTICAST_GROUP_ID_all_routers);
2729           ip6_neighbor_add_mld_grp (a,
2730                                     IP6_MULTICAST_SCOPE_link_local,
2731                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2732         }
2733     }
2734   return ri;
2735 }
2736
2737 /* send an mldpv2 report  */
2738 static void
2739 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2740 {
2741   vnet_main_t *vnm = vnet_get_main ();
2742   vlib_main_t *vm = vnm->vlib_main;
2743   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2744   vnet_sw_interface_t *sw_if0;
2745   ethernet_interface_t *eth_if0;
2746   u32 ri;
2747   int bogus_length;
2748
2749   ip6_radv_t *radv_info;
2750   u16 payload_length;
2751   vlib_buffer_t *b0;
2752   ip6_header_t *ip0;
2753   u32 *to_next;
2754   vlib_frame_t *f;
2755   u32 bo0;
2756   u32 n_to_alloc = 1;
2757   u32 n_allocated;
2758
2759   icmp6_multicast_listener_report_header_t *rh0;
2760   icmp6_multicast_listener_report_packet_t *rp0;
2761
2762   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2763   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2764   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2765
2766   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2767     return;
2768
2769   /* look up the radv_t  information for this interface */
2770   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2771                            ~0);
2772
2773   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2774
2775   if (ri == ~0)
2776     return;
2777
2778   /* send report now - build a mldpv2 report packet  */
2779   n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2780   if (PREDICT_FALSE (n_allocated == 0))
2781     {
2782     alloc_fail:
2783       clib_warning ("buffer allocation failure");
2784       return;
2785     }
2786
2787   b0 = vlib_get_buffer (vm, bo0);
2788
2789   /* adjust the sizeof the buffer to just include the ipv6 header */
2790   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2791
2792   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2793
2794   b0->error = ICMP6_ERROR_NONE;
2795
2796   rp0 = vlib_buffer_get_current (b0);
2797   ip0 = (ip6_header_t *) & rp0->ip;
2798   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2799
2800   clib_memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2801
2802   ip0->ip_version_traffic_class_and_flow_label =
2803     clib_host_to_net_u32 (0x6 << 28);
2804
2805   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2806   /* for DEBUG - vnet driver won't seem to emit router alerts */
2807   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2808   ip0->hop_limit = 1;
2809
2810   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2811
2812   /* source address MUST be the link-local address */
2813   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2814   ip0->src_address = radv_info->link_local_address;
2815
2816   /* destination is all mldpv2 routers */
2817   ip6_set_reserved_multicast_address (&ip0->dst_address,
2818                                       IP6_MULTICAST_SCOPE_link_local,
2819                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2820
2821   /* add reports here */
2822   ip6_mldp_group_t *m;
2823   int num_addr_records = 0;
2824   icmp6_multicast_address_record_t rr;
2825
2826   /* fill in the hop-by-hop extension header (router alert) info */
2827   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2828   rh0->ext_hdr.n_data_u64s = 0;
2829
2830   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2831   rh0->alert.len = 2;
2832   rh0->alert.value = 0;
2833
2834   rh0->pad.type = 1;
2835   rh0->pad.len = 0;
2836
2837   rh0->icmp.checksum = 0;
2838
2839   /* *INDENT-OFF* */
2840   pool_foreach (m, radv_info->mldp_group_pool,
2841   ({
2842     rr.type = m->type;
2843     rr.aux_data_len_u32s = 0;
2844     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2845     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2846
2847     num_addr_records++;
2848
2849     if(vlib_buffer_add_data
2850       (vm, vlib_buffer_get_free_list_index (b0), &bo0,
2851        (void *)&rr, sizeof(icmp6_multicast_address_record_t)))
2852       {
2853         vlib_buffer_free (vm, &bo0, 1);
2854         goto alloc_fail;
2855       }
2856
2857     payload_length += sizeof( icmp6_multicast_address_record_t);
2858   }));
2859   /* *INDENT-ON* */
2860
2861   rh0->rsvd = 0;
2862   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2863
2864   /* update lengths */
2865   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2866
2867   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2868                                                           &bogus_length);
2869   ASSERT (bogus_length == 0);
2870
2871   /*
2872    * OK to override w/ no regard for actual FIB, because
2873    * ip6-rewrite only looks at the adjacency.
2874    */
2875   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2876     vnet_main.local_interface_sw_if_index;
2877
2878   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2879   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2880
2881   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2882
2883   f = vlib_get_frame_to_node (vm, node->index);
2884   to_next = vlib_frame_vector_args (f);
2885   to_next[0] = bo0;
2886   f->n_vectors = 1;
2887
2888   vlib_put_frame_to_node (vm, node->index, f);
2889   return;
2890 }
2891
2892 /* *INDENT-OFF* */
2893 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2894 {
2895   .function = icmp6_router_solicitation,
2896   .name = "icmp6-router-solicitation",
2897
2898   .vector_size = sizeof (u32),
2899
2900   .format_trace = format_icmp6_input_trace,
2901
2902   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2903   .next_nodes = {
2904     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
2905     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2906     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2907   },
2908 };
2909 /* *INDENT-ON* */
2910
2911 /* send a RA or update the timer info etc.. */
2912 static uword
2913 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2914                                   vlib_node_runtime_t * node,
2915                                   vlib_frame_t * frame)
2916 {
2917   vnet_main_t *vnm = vnet_get_main ();
2918   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2919   ip6_radv_t *radv_info;
2920   vlib_frame_t *f = 0;
2921   u32 n_this_frame = 0;
2922   u32 n_left_to_next = 0;
2923   u32 *to_next = 0;
2924   u32 bo0;
2925   icmp6_router_solicitation_header_t *h0;
2926   vlib_buffer_t *b0;
2927   f64 now = vlib_time_now (vm);
2928
2929   /* Interface ip6 radv info list */
2930   /* *INDENT-OFF* */
2931   pool_foreach (radv_info, nm->if_radv_pool,
2932   ({
2933     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2934       {
2935         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2936         radv_info->next_multicast_time = now;
2937         radv_info->last_multicast_time = now;
2938         radv_info->last_radv_time = 0;
2939         radv_info->all_routers_mcast = 0;
2940         continue;
2941       }
2942
2943     /* Make sure that we've joined the all-routers multicast group */
2944     if(!radv_info->all_routers_mcast)
2945       {
2946         /* send MDLP_REPORT_EVENT message */
2947         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2948         radv_info->all_routers_mcast = 1;
2949       }
2950
2951     /* is it time to send a multicast  RA on this interface? */
2952     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2953       {
2954         u32 n_to_alloc = 1;
2955         u32 n_allocated;
2956
2957         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2958           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2959
2960         /* multicast send - compute next multicast send time */
2961         if( radv_info->initial_adverts_sent > 0)
2962           {
2963             radv_info->initial_adverts_sent--;
2964             if(rfn > radv_info-> initial_adverts_interval)
2965               rfn =  radv_info-> initial_adverts_interval;
2966
2967             /* check to see if we are ceasing to send */
2968             if( radv_info->initial_adverts_sent  == 0)
2969               if(radv_info->cease_radv)
2970                 radv_info->send_radv = 0;
2971           }
2972
2973         radv_info->next_multicast_time =  rfn + now;
2974         radv_info->last_multicast_time = now;
2975
2976         /* send advert now - build a "solicted" router advert with unspecified source address */
2977         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2978
2979         if (PREDICT_FALSE(n_allocated == 0))
2980           {
2981             clib_warning ("buffer allocation failure");
2982             continue;
2983           }
2984         b0 = vlib_get_buffer (vm, bo0);
2985         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2986         b0->error = ICMP6_ERROR_NONE;
2987         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2988
2989         h0 =  vlib_buffer_get_current (b0);
2990
2991         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2992
2993         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2994         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2995                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2996         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2997         h0->ip.hop_limit = 255;
2998
2999         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
3000         h0->ip.src_address.as_u64[0] = 0;
3001         h0->ip.src_address.as_u64[1] = 0;
3002
3003         h0->ip.dst_address.as_u64[0] = 0;
3004         h0->ip.dst_address.as_u64[1] = 0;
3005
3006         h0->neighbor.icmp.type = ICMP6_router_solicitation;
3007
3008         if (PREDICT_FALSE(f == 0))
3009           {
3010             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
3011             to_next = vlib_frame_vector_args (f);
3012             n_left_to_next = VLIB_FRAME_SIZE;
3013             n_this_frame = 0;
3014           }
3015
3016         n_this_frame++;
3017         n_left_to_next--;
3018         to_next[0] = bo0;
3019         to_next += 1;
3020
3021         if (PREDICT_FALSE(n_left_to_next == 0))
3022           {
3023             f->n_vectors = n_this_frame;
3024             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3025             f = 0;
3026           }
3027       }
3028   }));
3029   /* *INDENT-ON* */
3030
3031   if (f)
3032     {
3033       ASSERT (n_this_frame);
3034       f->n_vectors = n_this_frame;
3035       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3036     }
3037   return 0;
3038 }
3039
3040 static uword
3041 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
3042                                            vlib_node_runtime_t * node,
3043                                            vlib_frame_t * frame)
3044 {
3045   uword event_type;
3046   ip6_icmp_neighbor_discovery_event_data_t *event_data;
3047
3048   /* init code here */
3049
3050   while (1)
3051     {
3052       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
3053
3054       event_data = vlib_process_get_event_data (vm, &event_type);
3055
3056       if (!event_data)
3057         {
3058           /* No events found: timer expired. */
3059           /* process interface list and send RAs as appropriate, update timer info */
3060           ip6_neighbor_process_timer_event (vm, node, frame);
3061         }
3062       else
3063         {
3064           switch (event_type)
3065             {
3066
3067             case ICMP6_ND_EVENT_INIT:
3068               break;
3069
3070             case ~0:
3071               break;
3072
3073             default:
3074               ASSERT (0);
3075             }
3076
3077           if (event_data)
3078             _vec_len (event_data) = 0;
3079         }
3080     }
3081   return frame->n_vectors;
3082 }
3083
3084 /* *INDENT-OFF* */
3085 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
3086 {
3087   .function = icmp6_router_advertisement,
3088   .name = "icmp6-router-advertisement",
3089
3090   .vector_size = sizeof (u32),
3091
3092   .format_trace = format_icmp6_input_trace,
3093
3094   .n_next_nodes = 1,
3095   .next_nodes = {
3096     [0] = "ip6-drop",
3097   },
3098 };
3099 /* *INDENT-ON* */
3100
3101 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
3102
3103   .function = ip6_icmp_neighbor_discovery_event_process,
3104   .name = "ip6-icmp-neighbor-discovery-event-process",
3105   .type = VLIB_NODE_TYPE_PROCESS,
3106 };
3107
3108 static uword
3109 icmp6_neighbor_solicitation (vlib_main_t * vm,
3110                              vlib_node_runtime_t * node, vlib_frame_t * frame)
3111 {
3112   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3113                                                        /* is_solicitation */
3114                                                        1);
3115 }
3116
3117 static uword
3118 icmp6_neighbor_advertisement (vlib_main_t * vm,
3119                               vlib_node_runtime_t * node,
3120                               vlib_frame_t * frame)
3121 {
3122   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3123                                                        /* is_solicitation */
3124                                                        0);
3125 }
3126
3127 /* *INDENT-OFF* */
3128 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
3129 {
3130   .function = icmp6_neighbor_solicitation,
3131   .name = "icmp6-neighbor-solicitation",
3132
3133   .vector_size = sizeof (u32),
3134
3135   .format_trace = format_icmp6_input_trace,
3136
3137   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
3138   .next_nodes = {
3139     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "ip6-drop",
3140     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
3141   },
3142 };
3143 /* *INDENT-ON* */
3144
3145 /* *INDENT-OFF* */
3146 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
3147 {
3148   .function = icmp6_neighbor_advertisement,
3149   .name = "icmp6-neighbor-advertisement",
3150
3151   .vector_size = sizeof (u32),
3152
3153   .format_trace = format_icmp6_input_trace,
3154
3155   .n_next_nodes = 1,
3156   .next_nodes = {
3157     [0] = "ip6-drop",
3158   },
3159 };
3160 /* *INDENT-ON* */
3161
3162 typedef enum
3163 {
3164   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3165   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
3166   IP6_DISCOVER_NEIGHBOR_N_NEXT,
3167 } ip6_discover_neighbor_next_t;
3168
3169 typedef enum
3170 {
3171   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
3172   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
3173   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
3174 } ip6_discover_neighbor_error_t;
3175
3176 static uword
3177 ip6_discover_neighbor_inline (vlib_main_t * vm,
3178                               vlib_node_runtime_t * node,
3179                               vlib_frame_t * frame, int is_glean)
3180 {
3181   vnet_main_t *vnm = vnet_get_main ();
3182   ip6_main_t *im = &ip6_main;
3183   ip_lookup_main_t *lm = &im->lookup_main;
3184   u32 *from, *to_next_drop;
3185   uword n_left_from, n_left_to_next_drop;
3186   u64 seed;
3187   u32 thread_index = vm->thread_index;
3188   int bogus_length;
3189   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3190
3191   if (node->flags & VLIB_NODE_FLAG_TRACE)
3192     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
3193
3194   seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm));
3195
3196   from = vlib_frame_vector_args (frame);
3197   n_left_from = frame->n_vectors;
3198
3199   while (n_left_from > 0)
3200     {
3201       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3202                            to_next_drop, n_left_to_next_drop);
3203
3204       while (n_left_from > 0 && n_left_to_next_drop > 0)
3205         {
3206           u32 pi0, adj_index0, sw_if_index0, drop0, r0, next0;
3207           vnet_hw_interface_t *hw_if0;
3208           ip6_radv_t *radv_info;
3209           ip_adjacency_t *adj0;
3210           vlib_buffer_t *p0;
3211           ip6_header_t *ip0;
3212
3213           pi0 = from[0];
3214
3215           p0 = vlib_get_buffer (vm, pi0);
3216
3217           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
3218
3219           ip0 = vlib_buffer_get_current (p0);
3220
3221           adj0 = adj_get (adj_index0);
3222
3223           if (!is_glean)
3224             {
3225               ip0->dst_address.as_u64[0] =
3226                 adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
3227               ip0->dst_address.as_u64[1] =
3228                 adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
3229             }
3230
3231           sw_if_index0 = adj0->rewrite_header.sw_if_index;
3232           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
3233
3234           /* combine the address and interface for a hash */
3235           r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0;
3236
3237           drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed);
3238
3239           from += 1;
3240           n_left_from -= 1;
3241           to_next_drop[0] = pi0;
3242           to_next_drop += 1;
3243           n_left_to_next_drop -= 1;
3244
3245           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
3246
3247           /* If the interface is link-down, drop the pkt */
3248           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
3249             drop0 = 1;
3250
3251           if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0)
3252             {
3253               u32 ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
3254
3255               if (ri != ~0)
3256                 radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3257               else
3258                 drop0 = 1;
3259             }
3260           else
3261             drop0 = 1;
3262
3263           /*
3264            * the adj has been updated to a rewrite but the node the DPO that got
3265            * us here hasn't - yet. no big deal. we'll drop while we wait.
3266            */
3267           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
3268             drop0 = 1;
3269
3270           p0->error =
3271             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
3272                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
3273
3274           if (drop0)
3275             continue;
3276
3277           {
3278             u32 bi0 = 0;
3279             icmp6_neighbor_solicitation_header_t *h0;
3280             vlib_buffer_t *b0;
3281
3282             h0 = vlib_packet_template_get_packet
3283               (vm, &im->discover_neighbor_packet_template, &bi0);
3284             if (!h0)
3285               continue;
3286
3287             /* copy the persistent fields from the original */
3288             b0 = vlib_get_buffer (vm, bi0);
3289             clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
3290
3291             /*
3292              * Build ethernet header.
3293              * Choose source address based on destination lookup
3294              * adjacency.
3295              */
3296             if (!ip6_src_address_for_packet (lm,
3297                                              sw_if_index0,
3298                                              &ip0->dst_address,
3299                                              &h0->ip.src_address))
3300               {
3301                 /* There is no address on the interface */
3302                 p0->error =
3303                   node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
3304                 vlib_buffer_free (vm, &bi0, 1);
3305                 continue;
3306               }
3307
3308             /*
3309              * Destination address is a solicited node multicast address.
3310              * We need to fill in
3311              * the low 24 bits with low 24 bits of target's address.
3312              */
3313             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
3314             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
3315             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
3316
3317             h0->neighbor.target_address = ip0->dst_address;
3318
3319             clib_memcpy (h0->link_layer_option.ethernet_address,
3320                          hw_if0->hw_address, vec_len (hw_if0->hw_address));
3321
3322             /* $$$$ appears we need this; why is the checksum non-zero? */
3323             h0->neighbor.icmp.checksum = 0;
3324             h0->neighbor.icmp.checksum =
3325               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
3326                                                  &bogus_length);
3327
3328             ASSERT (bogus_length == 0);
3329
3330             vlib_buffer_copy_trace_flag (vm, p0, bi0);
3331             vnet_buffer (b0)->sw_if_index[VLIB_TX]
3332               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
3333
3334             vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
3335               radv_info->mcast_adj_index;
3336
3337             b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
3338             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
3339
3340             vlib_set_next_frame_buffer (vm, node, next0, bi0);
3341           }
3342         }
3343
3344       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3345                            n_left_to_next_drop);
3346     }
3347
3348   return frame->n_vectors;
3349 }
3350
3351 static uword
3352 ip6_discover_neighbor (vlib_main_t * vm,
3353                        vlib_node_runtime_t * node, vlib_frame_t * frame)
3354 {
3355   return (ip6_discover_neighbor_inline (vm, node, frame, 0));
3356 }
3357
3358 static uword
3359 ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
3360 {
3361   return (ip6_discover_neighbor_inline (vm, node, frame, 1));
3362 }
3363
3364 static char *ip6_discover_neighbor_error_strings[] = {
3365   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
3366   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
3367   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
3368     = "no source address for ND solicitation",
3369 };
3370
3371 /* *INDENT-OFF* */
3372 VLIB_REGISTER_NODE (ip6_glean_node) =
3373 {
3374   .function = ip6_glean,
3375   .name = "ip6-glean",
3376   .vector_size = sizeof (u32),
3377   .format_trace = format_ip6_forward_next_trace,
3378   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3379   .error_strings = ip6_discover_neighbor_error_strings,
3380   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3381   .next_nodes =
3382   {
3383     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3384     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3385   },
3386 };
3387 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
3388 {
3389   .function = ip6_discover_neighbor,
3390   .name = "ip6-discover-neighbor",
3391   .vector_size = sizeof (u32),
3392   .format_trace = format_ip6_forward_next_trace,
3393   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3394   .error_strings = ip6_discover_neighbor_error_strings,
3395   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3396   .next_nodes =
3397   {
3398     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3399     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3400   },
3401 };
3402 /* *INDENT-ON* */
3403
3404 /* API support functions */
3405 int
3406 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
3407                         u8 suppress, u8 managed, u8 other,
3408                         u8 ll_option, u8 send_unicast, u8 cease,
3409                         u8 use_lifetime, u32 lifetime,
3410                         u32 initial_count, u32 initial_interval,
3411                         u32 max_interval, u32 min_interval, u8 is_no)
3412 {
3413   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3414   int error;
3415   u32 ri;
3416
3417   /* look up the radv_t  information for this interface */
3418   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3419                            ~0);
3420   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3421   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3422
3423   if (!error)
3424     {
3425
3426       ip6_radv_t *radv_info;
3427       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3428
3429       if ((max_interval != 0) && (min_interval == 0))
3430         min_interval = .75 * max_interval;
3431
3432       max_interval =
3433         (max_interval !=
3434          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
3435         radv_info->max_radv_interval;
3436       min_interval =
3437         (min_interval !=
3438          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
3439         radv_info->min_radv_interval;
3440       lifetime =
3441         (use_lifetime !=
3442          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
3443         radv_info->adv_router_lifetime_in_sec;
3444
3445       if (lifetime)
3446         {
3447           if (lifetime > MAX_DEF_RTR_LIFETIME)
3448             lifetime = MAX_DEF_RTR_LIFETIME;
3449
3450           if (lifetime <= max_interval)
3451             return VNET_API_ERROR_INVALID_VALUE;
3452         }
3453
3454       if (min_interval != 0)
3455         {
3456           if ((min_interval > .75 * max_interval) || (min_interval < 3))
3457             return VNET_API_ERROR_INVALID_VALUE;
3458         }
3459
3460       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
3461           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
3462         return VNET_API_ERROR_INVALID_VALUE;
3463
3464       /*
3465          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
3466          if "flag" is clear  don't change corresponding value
3467        */
3468       radv_info->send_radv =
3469         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
3470       radv_info->adv_managed_flag =
3471         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
3472       radv_info->adv_other_flag =
3473         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
3474       radv_info->adv_link_layer_address =
3475         (ll_option !=
3476          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
3477       radv_info->send_unicast =
3478         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
3479       radv_info->cease_radv =
3480         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
3481
3482       radv_info->min_radv_interval = min_interval;
3483       radv_info->max_radv_interval = max_interval;
3484       radv_info->adv_router_lifetime_in_sec = lifetime;
3485
3486       radv_info->initial_adverts_count =
3487         (initial_count !=
3488          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
3489         radv_info->initial_adverts_count;
3490       radv_info->initial_adverts_interval =
3491         (initial_interval !=
3492          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
3493         radv_info->initial_adverts_interval;
3494
3495       /* restart */
3496       if ((cease != 0) && (is_no))
3497         radv_info->send_radv = 1;
3498
3499       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3500       radv_info->next_multicast_time = vlib_time_now (vm);
3501       radv_info->last_multicast_time = vlib_time_now (vm);
3502       radv_info->last_radv_time = 0;
3503     }
3504   return (error);
3505 }
3506
3507 int
3508 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
3509                         ip6_address_t * prefix_addr, u8 prefix_len,
3510                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
3511                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
3512                         u8 no_onlink, u8 is_no)
3513 {
3514   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3515   int error;
3516
3517   u32 ri;
3518
3519   /* look up the radv_t  information for this interface */
3520   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3521                            ~0);
3522
3523   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3524
3525   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3526
3527   if (!error)
3528     {
3529       f64 now = vlib_time_now (vm);
3530       ip6_radv_t *radv_info;
3531       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3532
3533       /* prefix info add, delete or update */
3534       ip6_radv_prefix_t *prefix;
3535
3536       /* lookup  prefix info for this  address on this interface */
3537       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
3538
3539       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
3540
3541       if (is_no)
3542         {
3543           /* delete */
3544           if (!prefix)
3545             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
3546
3547           if (prefix->prefix_len != prefix_len)
3548             return VNET_API_ERROR_INVALID_VALUE_2;
3549
3550           /* FIXME - Should the DP do this or the CP ? */
3551           /* do specific delete processing here before returning */
3552           /* try to remove from routing table */
3553
3554           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
3555                        /* old_value */ 0);
3556           pool_put (radv_info->adv_prefixes_pool, prefix);
3557
3558           radv_info->initial_adverts_sent =
3559             radv_info->initial_adverts_count - 1;
3560           radv_info->next_multicast_time = vlib_time_now (vm);
3561           radv_info->last_multicast_time = vlib_time_now (vm);
3562           radv_info->last_radv_time = 0;
3563           return (error);
3564         }
3565
3566       /* adding or changing */
3567       if (!prefix)
3568         {
3569           /* add */
3570           u32 pi;
3571           pool_get (radv_info->adv_prefixes_pool, prefix);
3572           pi = prefix - radv_info->adv_prefixes_pool;
3573           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
3574                      /* old_value */ 0);
3575
3576           clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
3577
3578           prefix->prefix_len = prefix_len;
3579           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
3580
3581           /* initialize default values */
3582           prefix->adv_on_link_flag = 1; /* L bit set */
3583           prefix->adv_autonomous_flag = 1;      /* A bit set */
3584           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
3585           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
3586           prefix->enabled = 1;
3587           prefix->decrement_lifetime_flag = 1;
3588           prefix->deprecated_prefix_flag = 1;
3589
3590           if (off_link == 0)
3591             {
3592               /* FIXME - Should the DP do this or the CP ? */
3593               /* insert prefix into routing table as a connected prefix */
3594             }
3595
3596           if (use_default)
3597             goto restart;
3598         }
3599       else
3600         {
3601
3602           if (prefix->prefix_len != prefix_len)
3603             return VNET_API_ERROR_INVALID_VALUE_2;
3604
3605           if (off_link != 0)
3606             {
3607               /* FIXME - Should the DP do this or the CP ? */
3608               /* remove from routing table if already there */
3609             }
3610         }
3611
3612       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
3613         {
3614           prefix->adv_valid_lifetime_in_secs = ~0;
3615           prefix->adv_pref_lifetime_in_secs = ~0;
3616           prefix->decrement_lifetime_flag = 0;
3617         }
3618       else
3619         {
3620           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
3621           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
3622         }
3623
3624       /* copy  remaining */
3625       prefix->enabled = !(no_advertise != 0);
3626       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
3627       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
3628
3629     restart:
3630       /* restart */
3631       /* fill in the expiration times  */
3632       prefix->valid_lifetime_expires =
3633         now + prefix->adv_valid_lifetime_in_secs;
3634       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
3635
3636       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3637       radv_info->next_multicast_time = vlib_time_now (vm);
3638       radv_info->last_multicast_time = vlib_time_now (vm);
3639       radv_info->last_radv_time = 0;
3640     }
3641   return (error);
3642 }
3643
3644 clib_error_t *
3645 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
3646                   vlib_cli_command_t * cmd)
3647 {
3648   vnet_main_t *vnm = vnet_get_main ();
3649   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3650   clib_error_t *error = 0;
3651   u8 is_no = 0;
3652   u8 suppress = 0, managed = 0, other = 0;
3653   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
3654   u8 use_lifetime = 0;
3655   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
3656     0, ra_initial_interval = 0;
3657   u32 ra_max_interval = 0, ra_min_interval = 0;
3658
3659   unformat_input_t _line_input, *line_input = &_line_input;
3660   vnet_sw_interface_t *sw_if0;
3661
3662   int add_radv_info = 1;
3663   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
3664   ip6_address_t ip6_addr;
3665   u32 addr_len;
3666
3667
3668   /* Get a line of input. */
3669   if (!unformat_user (main_input, unformat_line_input, line_input))
3670     return 0;
3671
3672   /* get basic radv info for this interface */
3673   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3674     {
3675
3676       if (unformat_user (line_input,
3677                          unformat_vnet_sw_interface, vnm, &sw_if_index))
3678         {
3679           u32 ri;
3680           ethernet_interface_t *eth_if0 = 0;
3681
3682           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3683           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3684             eth_if0 =
3685               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3686
3687           if (!eth_if0)
3688             {
3689               error =
3690                 clib_error_return (0, "Interface must be of ethernet type");
3691               goto done;
3692             }
3693
3694           /* look up the radv_t  information for this interface */
3695           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3696                                    sw_if_index, ~0);
3697
3698           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3699
3700           if (ri != ~0)
3701             {
3702               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3703             }
3704           else
3705             {
3706               error = clib_error_return (0, "unknown interface %U'",
3707                                          format_unformat_error, line_input);
3708               goto done;
3709             }
3710         }
3711       else
3712         {
3713           error = clib_error_return (0, "invalid interface name %U'",
3714                                      format_unformat_error, line_input);
3715           goto done;
3716         }
3717     }
3718
3719   /* get the rest of the command */
3720   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3721     {
3722       if (unformat (line_input, "no"))
3723         is_no = 1;
3724       else if (unformat (line_input, "prefix %U/%d",
3725                          unformat_ip6_address, &ip6_addr, &addr_len))
3726         {
3727           add_radv_info = 0;
3728           break;
3729         }
3730       else if (unformat (line_input, "ra-managed-config-flag"))
3731         {
3732           managed = 1;
3733           break;
3734         }
3735       else if (unformat (line_input, "ra-other-config-flag"))
3736         {
3737           other = 1;
3738           break;
3739         }
3740       else if (unformat (line_input, "ra-suppress") ||
3741                unformat (line_input, "ra-surpress"))
3742         {
3743           suppress = 1;
3744           break;
3745         }
3746       else if (unformat (line_input, "ra-suppress-link-layer") ||
3747                unformat (line_input, "ra-surpress-link-layer"))
3748         {
3749           suppress_ll_option = 1;
3750           break;
3751         }
3752       else if (unformat (line_input, "ra-send-unicast"))
3753         {
3754           send_unicast = 1;
3755           break;
3756         }
3757       else if (unformat (line_input, "ra-lifetime"))
3758         {
3759           if (!unformat (line_input, "%d", &ra_lifetime))
3760             {
3761               error = unformat_parse_error (line_input);
3762               goto done;
3763             }
3764           use_lifetime = 1;
3765           break;
3766         }
3767       else if (unformat (line_input, "ra-initial"))
3768         {
3769           if (!unformat
3770               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3771             {
3772               error = unformat_parse_error (line_input);
3773               goto done;
3774             }
3775           break;
3776         }
3777       else if (unformat (line_input, "ra-interval"))
3778         {
3779           if (!unformat (line_input, "%d", &ra_max_interval))
3780             {
3781               error = unformat_parse_error (line_input);
3782               goto done;
3783             }
3784
3785           if (!unformat (line_input, "%d", &ra_min_interval))
3786             ra_min_interval = 0;
3787           break;
3788         }
3789       else if (unformat (line_input, "ra-cease"))
3790         {
3791           cease = 1;
3792           break;
3793         }
3794       else
3795         {
3796           error = unformat_parse_error (line_input);
3797           goto done;
3798         }
3799     }
3800
3801   if (add_radv_info)
3802     {
3803       ip6_neighbor_ra_config (vm, sw_if_index,
3804                               suppress, managed, other,
3805                               suppress_ll_option, send_unicast, cease,
3806                               use_lifetime, ra_lifetime,
3807                               ra_initial_count, ra_initial_interval,
3808                               ra_max_interval, ra_min_interval, is_no);
3809     }
3810   else
3811     {
3812       u32 valid_lifetime_in_secs = 0;
3813       u32 pref_lifetime_in_secs = 0;
3814       u8 use_prefix_default_values = 0;
3815       u8 no_advertise = 0;
3816       u8 off_link = 0;
3817       u8 no_autoconfig = 0;
3818       u8 no_onlink = 0;
3819
3820       /* get the rest of the command */
3821       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3822         {
3823           if (unformat (line_input, "default"))
3824             {
3825               use_prefix_default_values = 1;
3826               break;
3827             }
3828           else if (unformat (line_input, "infinite"))
3829             {
3830               valid_lifetime_in_secs = ~0;
3831               pref_lifetime_in_secs = ~0;
3832               break;
3833             }
3834           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3835                              &pref_lifetime_in_secs))
3836             break;
3837           else
3838             break;
3839         }
3840
3841
3842       /* get the rest of the command */
3843       while (!use_prefix_default_values &&
3844              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3845         {
3846           if (unformat (line_input, "no-advertise"))
3847             no_advertise = 1;
3848           else if (unformat (line_input, "off-link"))
3849             off_link = 1;
3850           else if (unformat (line_input, "no-autoconfig"))
3851             no_autoconfig = 1;
3852           else if (unformat (line_input, "no-onlink"))
3853             no_onlink = 1;
3854           else
3855             {
3856               error = unformat_parse_error (line_input);
3857               goto done;
3858             }
3859         }
3860
3861       ip6_neighbor_ra_prefix (vm, sw_if_index,
3862                               &ip6_addr, addr_len,
3863                               use_prefix_default_values,
3864                               valid_lifetime_in_secs,
3865                               pref_lifetime_in_secs,
3866                               no_advertise,
3867                               off_link, no_autoconfig, no_onlink, is_no);
3868     }
3869
3870 done:
3871   unformat_free (line_input);
3872
3873   return error;
3874 }
3875
3876 static void
3877 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3878 {
3879   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3880   u32 i;
3881
3882   for (i = 0; i < vec_len (addrs); i++)
3883     {
3884       ip_interface_address_t *a =
3885         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3886       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3887
3888       vlib_cli_output (vm, "\t\t%U/%d",
3889                        format_ip6_address, address, a->address_length);
3890     }
3891 }
3892
3893 static clib_error_t *
3894 show_ip6_interface_cmd (vlib_main_t * vm,
3895                         unformat_input_t * input, vlib_cli_command_t * cmd)
3896 {
3897   vnet_main_t *vnm = vnet_get_main ();
3898   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3899   clib_error_t *error = 0;
3900   u32 sw_if_index;
3901
3902   sw_if_index = ~0;
3903
3904   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3905     {
3906       u32 ri;
3907
3908       /* look up the radv_t  information for this interface */
3909       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3910                                sw_if_index, ~0);
3911
3912       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3913
3914       if (ri != ~0)
3915         {
3916           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3917           ip6_radv_t *radv_info;
3918           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3919
3920           vlib_cli_output (vm, "%U is admin %s\n",
3921                            format_vnet_sw_interface_name, vnm,
3922                            vnet_get_sw_interface (vnm, sw_if_index),
3923                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3924                             "up" : "down"));
3925
3926           u32 ai;
3927           u32 *link_scope = 0, *global_scope = 0;
3928           u32 *local_scope = 0, *unknown_scope = 0;
3929           ip_interface_address_t *a;
3930
3931           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3932                                    sw_if_index, ~0);
3933           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3934
3935           while (ai != (u32) ~ 0)
3936             {
3937               a = pool_elt_at_index (lm->if_address_pool, ai);
3938               ip6_address_t *address =
3939                 ip_interface_address_get_address (lm, a);
3940
3941               if (ip6_address_is_link_local_unicast (address))
3942                 vec_add1 (link_scope, ai);
3943               else if (ip6_address_is_global_unicast (address))
3944                 vec_add1 (global_scope, ai);
3945               else if (ip6_address_is_local_unicast (address))
3946                 vec_add1 (local_scope, ai);
3947               else
3948                 vec_add1 (unknown_scope, ai);
3949
3950               ai = a->next_this_sw_interface;
3951             }
3952
3953           if (vec_len (link_scope))
3954             {
3955               vlib_cli_output (vm, "\tLink-local address(es):\n");
3956               ip6_print_addrs (vm, link_scope);
3957               vec_free (link_scope);
3958             }
3959
3960           if (vec_len (local_scope))
3961             {
3962               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3963               ip6_print_addrs (vm, local_scope);
3964               vec_free (local_scope);
3965             }
3966
3967           if (vec_len (global_scope))
3968             {
3969               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3970               ip6_print_addrs (vm, global_scope);
3971               vec_free (global_scope);
3972             }
3973
3974           if (vec_len (unknown_scope))
3975             {
3976               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3977               ip6_print_addrs (vm, unknown_scope);
3978               vec_free (unknown_scope);
3979             }
3980
3981           vlib_cli_output (vm, "\tLink-local address(es):\n");
3982           vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3983                            &radv_info->link_local_address);
3984
3985           vlib_cli_output (vm, "\tJoined group address(es):\n");
3986           ip6_mldp_group_t *m;
3987           /* *INDENT-OFF* */
3988           pool_foreach (m, radv_info->mldp_group_pool,
3989           ({
3990             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3991                              &m->mcast_address);
3992           }));
3993           /* *INDENT-ON* */
3994
3995           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3996           ip6_radv_prefix_t *p;
3997           /* *INDENT-OFF* */
3998           pool_foreach (p, radv_info->adv_prefixes_pool,
3999           ({
4000             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
4001                              format_ip6_address, &p->prefix, p->prefix_len);
4002           }));
4003           /* *INDENT-ON* */
4004
4005           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
4006           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
4007           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
4008           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
4009           vlib_cli_output (vm, "\tND DAD is disabled\n");
4010           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
4011           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
4012                            radv_info->adv_neighbor_reachable_time_in_msec);
4013           vlib_cli_output (vm,
4014                            "\tND advertised retransmit interval is %d (msec)\n",
4015                            radv_info->
4016                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
4017
4018           u32 ra_interval = radv_info->max_radv_interval;
4019           u32 ra_interval_min = radv_info->min_radv_interval;
4020           vlib_cli_output (vm,
4021                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
4022                            ra_interval, ra_interval_min);
4023           vlib_cli_output (vm,
4024                            "\tND router advertisements live for %d seconds\n",
4025                            radv_info->adv_router_lifetime_in_sec);
4026           vlib_cli_output (vm,
4027                            "\tHosts %s stateless autoconfig for addresses\n",
4028                            (radv_info->adv_managed_flag) ? "use" :
4029                            " don't use");
4030           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
4031                            radv_info->n_advertisements_sent);
4032           vlib_cli_output (vm, "\tND router solicitations received %d\n",
4033                            radv_info->n_solicitations_rcvd);
4034           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
4035                            radv_info->n_solicitations_dropped);
4036         }
4037       else
4038         {
4039           error = clib_error_return (0, "IPv6 not enabled on interface",
4040                                      format_unformat_error, input);
4041
4042         }
4043     }
4044   return error;
4045 }
4046
4047 /*?
4048  * This command is used to display various IPv6 attributes on a given
4049  * interface.
4050  *
4051  * @cliexpar
4052  * Example of how to display IPv6 settings:
4053  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4054  * GigabitEthernet2/0/0 is admin up
4055  *         Link-local address(es):
4056  *                 fe80::ab8/64
4057  *         Joined group address(es):
4058  *                 ff02::1
4059  *                 ff02::2
4060  *                 ff02::16
4061  *                 ff02::1:ff00:ab8
4062  *         Advertised Prefixes:
4063  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
4064  *         MTU is 1500
4065  *         ICMP error messages are unlimited
4066  *         ICMP redirects are disabled
4067  *         ICMP unreachables are not sent
4068  *         ND DAD is disabled
4069  *         ND advertised reachable time is 0
4070  *         ND advertised retransmit interval is 0 (msec)
4071  *         ND router advertisements are sent every 200 seconds (min interval is 150)
4072  *         ND router advertisements live for 600 seconds
4073  *         Hosts use stateless autoconfig for addresses
4074  *         ND router advertisements sent 19336
4075  *         ND router solicitations received 0
4076  *         ND router solicitations dropped 0
4077  * @cliexend
4078  * Example of output if IPv6 is not enabled on the interface:
4079  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4080  * show ip6 interface: IPv6 not enabled on interface
4081  * @cliexend
4082 ?*/
4083 /* *INDENT-OFF* */
4084 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
4085 {
4086   .path = "show ip6 interface",
4087   .function = show_ip6_interface_cmd,
4088   .short_help = "show ip6 interface <interface>",
4089 };
4090 /* *INDENT-ON* */
4091
4092 clib_error_t *
4093 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4094 {
4095   clib_error_t *error = 0;
4096   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4097   u32 ri;
4098
4099   /* look up the radv_t  information for this interface */
4100   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4101                            ~0);
4102   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4103
4104   /* if not created - do nothing */
4105   if (ri != ~0)
4106     {
4107       ip6_radv_t *radv_info;
4108
4109       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4110
4111       /* check radv_info ref count for other ip6 addresses on this interface */
4112       /* This implicitly excludes the link local address */
4113       if (radv_info->ref_count == 0)
4114         {
4115           /* essentially "disables" ipv6 on this interface */
4116           ip6_ll_prefix_t ilp = {
4117             .ilp_addr = radv_info->link_local_address,
4118             .ilp_sw_if_index = sw_if_index,
4119           };
4120           ip6_ll_table_entry_delete (&ilp);
4121           ip6_sw_interface_enable_disable (sw_if_index, 0);
4122           ip6_mfib_interface_enable_disable (sw_if_index, 0);
4123           ip6_neighbor_sw_interface_add_del (vnet_get_main (), sw_if_index,
4124                                              0);
4125         }
4126     }
4127   return error;
4128 }
4129
4130 int
4131 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
4132 {
4133   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4134   u32 ri = ~0;
4135
4136   /* look up the radv_t  information for this interface */
4137   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4138                            ~0);
4139
4140   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4141
4142   return ri != ~0;
4143 }
4144
4145 clib_error_t *
4146 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4147 {
4148   clib_error_t *error = 0;
4149   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4150   u32 ri;
4151   int is_add = 1;
4152
4153   /* look up the radv_t  information for this interface */
4154   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4155                            ~0);
4156
4157   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4158
4159   /* if not created yet */
4160   if (ri == ~0)
4161     {
4162       vnet_main_t *vnm = vnet_get_main ();
4163       vnet_sw_interface_t *sw_if0;
4164
4165       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
4166       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
4167         {
4168           ethernet_interface_t *eth_if0;
4169
4170           eth_if0 =
4171             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
4172           if (eth_if0)
4173             {
4174               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
4175               ri =
4176                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
4177
4178               if (ri != ~0)
4179                 {
4180                   ip6_radv_t *radv_info;
4181                   ip6_address_t link_local_address;
4182
4183                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4184
4185                   ip6_link_local_address_from_ethernet_mac_address
4186                     (&link_local_address, eth_if0->address);
4187
4188                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
4189                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB ||
4190                       sw_if0->type == VNET_SW_INTERFACE_TYPE_PIPE ||
4191                       sw_if0->type == VNET_SW_INTERFACE_TYPE_P2P)
4192                     {
4193                       /* make up  an interface id */
4194                       link_local_address.as_u64[1] =
4195                         random_u64 (&radv_info->randomizer);
4196
4197                       link_local_address.as_u64[0] =
4198                         clib_host_to_net_u64 (0xFE80000000000000ULL);
4199                       /* clear u bit */
4200                       link_local_address.as_u8[8] &= 0xfd;
4201                     }
4202                   {
4203                     ip6_ll_prefix_t ilp = {
4204                       .ilp_addr = link_local_address,
4205                       .ilp_sw_if_index = sw_if_index,
4206                     };
4207
4208                     ip6_ll_table_entry_update (&ilp, FIB_ROUTE_PATH_LOCAL);
4209                   }
4210
4211                   /* essentially "enables" ipv6 on this interface */
4212                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
4213                   ip6_sw_interface_enable_disable (sw_if_index, 1);
4214
4215                   if (!error)
4216                     {
4217                       radv_info->link_local_address = link_local_address;
4218                     }
4219                 }
4220             }
4221         }
4222     }
4223   return error;
4224 }
4225
4226 int
4227 ip6_get_ll_address (u32 sw_if_index, ip6_address_t * addr)
4228 {
4229   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4230   ip6_radv_t *radv_info;
4231   u32 ri;
4232
4233   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) <= sw_if_index)
4234     return 0;
4235
4236   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4237
4238   if (ri == ~0)
4239     return 0;
4240
4241   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4242   *addr = radv_info->link_local_address;
4243
4244   return (!0);
4245 }
4246
4247 static clib_error_t *
4248 enable_ip6_interface_cmd (vlib_main_t * vm,
4249                           unformat_input_t * input, vlib_cli_command_t * cmd)
4250 {
4251   vnet_main_t *vnm = vnet_get_main ();
4252   clib_error_t *error = 0;
4253   u32 sw_if_index;
4254
4255   sw_if_index = ~0;
4256
4257   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4258     {
4259       enable_ip6_interface (vm, sw_if_index);
4260     }
4261   else
4262     {
4263       error = clib_error_return (0, "unknown interface\n'",
4264                                  format_unformat_error, input);
4265
4266     }
4267   return error;
4268 }
4269
4270 /*?
4271  * This command is used to enable IPv6 on a given interface.
4272  *
4273  * @cliexpar
4274  * Example of how enable IPv6 on a given interface:
4275  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
4276 ?*/
4277 /* *INDENT-OFF* */
4278 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
4279 {
4280   .path = "enable ip6 interface",
4281   .function = enable_ip6_interface_cmd,
4282   .short_help = "enable ip6 interface <interface>",
4283 };
4284 /* *INDENT-ON* */
4285
4286 static clib_error_t *
4287 disable_ip6_interface_cmd (vlib_main_t * vm,
4288                            unformat_input_t * input, vlib_cli_command_t * cmd)
4289 {
4290   vnet_main_t *vnm = vnet_get_main ();
4291   clib_error_t *error = 0;
4292   u32 sw_if_index;
4293
4294   sw_if_index = ~0;
4295
4296   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4297     {
4298       error = disable_ip6_interface (vm, sw_if_index);
4299     }
4300   else
4301     {
4302       error = clib_error_return (0, "unknown interface\n'",
4303                                  format_unformat_error, input);
4304
4305     }
4306   return error;
4307 }
4308
4309 /*?
4310  * This command is used to disable IPv6 on a given interface.
4311  *
4312  * @cliexpar
4313  * Example of how disable IPv6 on a given interface:
4314  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
4315 ?*/
4316 /* *INDENT-OFF* */
4317 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
4318 {
4319   .path = "disable ip6 interface",
4320   .function = disable_ip6_interface_cmd,
4321   .short_help = "disable ip6 interface <interface>",
4322 };
4323 /* *INDENT-ON* */
4324
4325 /*?
4326  * This command is used to configure the neighbor discovery
4327  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
4328  * command to display some of the current neighbor discovery parameters
4329  * on a given interface. This command has three formats:
4330  *
4331  *
4332  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
4333  *
4334  * '<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>'
4335  *
4336  * Where:
4337  *
4338  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
4339  * router-advertisement messages to use stateful address
4340  * auto-configuration to obtain address information (sets the M-bit).
4341  * Default is the M-bit is not set and the '<em>no</em>' option
4342  * returns it to this default state.
4343  *
4344  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
4345  * router-advertisement messages that hosts use stateful auto
4346  * configuration to obtain nonaddress related information (sets
4347  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
4348  * option returns it to this default state.
4349  *
4350  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
4351  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
4352  * router-advertisement messages.
4353  *
4354  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
4355  * optional source link-layer address in the ICMPv6 router-advertisement
4356  * messages. Default is to include the optional source link-layer address
4357  * and the '<em>no</em>' option returns it to this default state.
4358  *
4359  * <em>[no] ra-send-unicast</em> - Use the source address of the
4360  * router-solicitation message if availiable. The default is to use
4361  * multicast address of all nodes, and the '<em>no</em>' option returns
4362  * it to this default state.
4363  *
4364  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
4365  * default router in ICMPv6 router-advertisement messages. The range is
4366  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
4367  * '<em><max-interval></em>'. The default value is 600 seconds and the
4368  * '<em>no</em>' option returns it to this default value.
4369  *
4370  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
4371  * router-advertisement messages sent and the interval between each
4372  * message. Range for count is 1 - 3 and default is 3. Range for interval
4373  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
4374  * returns both to their default value.
4375  *
4376  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
4377  * interval between sending ICMPv6 router-advertisement messages. The
4378  * range for max-interval is from 4 to 200 seconds. min-interval can not
4379  * be more than 75% of max-interval. If not set, min-interval will be
4380  * set to 75% of max-interval. The range for min-interval is from 3 to
4381  * 150 seconds.  The '<em>no</em>' option returns both to their default
4382  * value.
4383  *
4384  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
4385  * The '<em>no</em>' options implies to start (or restart) sending
4386  * ICMPv6 router-advertisement messages.
4387  *
4388  *
4389  * <b>Format 2 - Prefix Options:</b>
4390  *
4391  * '<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>'
4392  *
4393  * Where:
4394  *
4395  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
4396  *
4397  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
4398  * length of time in seconds during what the prefix is valid for the purpose of
4399  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
4400  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
4401  * length of time in seconds during what addresses generated from the prefix remain
4402  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
4403  *
4404  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
4405  * are inifinte, no timeout.
4406  *
4407  * <em>no-advertise</em> - Do not send full router address in prefix
4408  * advertisement. Default is to advertise (i.e. - This flag is off by default).
4409  *
4410  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
4411  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
4412  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
4413  *
4414  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
4415  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
4416  *
4417  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
4418  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
4419  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
4420  * the L-bit.
4421  *
4422  *
4423  * <b>Format 3: - Default of Prefix:</b>
4424  *
4425  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
4426  *
4427  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
4428  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
4429  * is ignored and the prefix is deleted.
4430  *
4431  *
4432  * @cliexpar
4433  * Example of how set a router advertisement option:
4434  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
4435  * Example of how to add a prefix:
4436  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
4437  * Example of how to delete a prefix:
4438  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
4439 ?*/
4440 /* *INDENT-OFF* */
4441 VLIB_CLI_COMMAND (ip6_nd_command, static) =
4442 {
4443   .path = "ip6 nd",
4444   .short_help = "ip6 nd <interface> ...",
4445   .function = ip6_neighbor_cmd,
4446 };
4447 /* *INDENT-ON* */
4448
4449 clib_error_t *
4450 ip6_neighbor_set_link_local_address (vlib_main_t * vm, u32 sw_if_index,
4451                                      ip6_address_t * address)
4452 {
4453   clib_error_t *error = 0;
4454   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4455   u32 ri;
4456   ip6_radv_t *radv_info;
4457   vnet_main_t *vnm = vnet_get_main ();
4458   ip6_ll_prefix_t pfx = { 0, };
4459
4460   if (!ip6_address_is_link_local_unicast (address))
4461     return (error = clib_error_return (0, "address not link-local",
4462                                        format_unformat_error));
4463
4464   /* call enable ipv6  */
4465   enable_ip6_interface (vm, sw_if_index);
4466
4467   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4468
4469   if (ri != ~0)
4470     {
4471       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4472
4473       pfx.ilp_sw_if_index = sw_if_index;
4474
4475       pfx.ilp_addr = radv_info->link_local_address;
4476       ip6_ll_table_entry_delete (&pfx);
4477
4478       pfx.ilp_addr = *address;
4479       ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_LOCAL);
4480
4481       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4482       radv_info->link_local_address = *address;
4483     }
4484   else
4485     {
4486       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
4487       error = clib_error_return (0, "ip6 not enabled for interface",
4488                                  format_unformat_error);
4489     }
4490   return error;
4491 }
4492
4493 /**
4494  * @brief callback when an interface address is added or deleted
4495  */
4496 static void
4497 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
4498                                         uword opaque,
4499                                         u32 sw_if_index,
4500                                         ip6_address_t * address,
4501                                         u32 address_length,
4502                                         u32 if_address_index, u32 is_delete)
4503 {
4504   vnet_main_t *vnm = vnet_get_main ();
4505   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4506   u32 ri;
4507   vlib_main_t *vm = vnm->vlib_main;
4508   ip6_radv_t *radv_info;
4509   ip6_address_t a;
4510
4511   /* create solicited node multicast address for this interface adddress */
4512   ip6_set_solicited_node_multicast_address (&a, 0);
4513
4514   a.as_u8[0xd] = address->as_u8[0xd];
4515   a.as_u8[0xe] = address->as_u8[0xe];
4516   a.as_u8[0xf] = address->as_u8[0xf];
4517
4518   if (!is_delete)
4519     {
4520       /* try to  create radv_info - does nothing if ipv6 already enabled */
4521       enable_ip6_interface (vm, sw_if_index);
4522
4523       /* look up the radv_t  information for this interface */
4524       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4525                                sw_if_index, ~0);
4526       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4527       if (ri != ~0)
4528         {
4529           /* get radv_info */
4530           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4531
4532           /* add address */
4533           if (!ip6_address_is_link_local_unicast (address))
4534             radv_info->ref_count++;
4535
4536           ip6_neighbor_add_mld_prefix (radv_info, &a);
4537         }
4538     }
4539   else
4540     {
4541
4542       /* delete */
4543       /* look up the radv_t  information for this interface */
4544       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4545                                sw_if_index, ~0);
4546       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4547
4548       if (ri != ~0)
4549         {
4550           /* get radv_info */
4551           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4552
4553           ip6_neighbor_del_mld_prefix (radv_info, &a);
4554
4555           /* if interface up send MLDP "report" */
4556           radv_info->all_routers_mcast = 0;
4557
4558           /* add address */
4559           if (!ip6_address_is_link_local_unicast (address))
4560             radv_info->ref_count--;
4561         }
4562       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
4563       disable_ip6_interface (vm, sw_if_index);
4564     }
4565 }
4566
4567 clib_error_t *
4568 ip6_set_neighbor_limit (u32 neighbor_limit)
4569 {
4570   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4571
4572   nm->limit_neighbor_cache_size = neighbor_limit;
4573   return 0;
4574 }
4575
4576 static void
4577 ip6_neighbor_table_bind (ip6_main_t * im,
4578                          uword opaque,
4579                          u32 sw_if_index,
4580                          u32 new_fib_index, u32 old_fib_index)
4581 {
4582   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4583   ip6_neighbor_t *n = NULL;
4584   u32 i, *to_re_add = 0;
4585
4586   /* *INDENT-OFF* */
4587   pool_foreach (n, nm->neighbor_pool,
4588   ({
4589     if (n->key.sw_if_index == sw_if_index)
4590       vec_add1 (to_re_add, n - nm->neighbor_pool);
4591   }));
4592   /* *INDENT-ON* */
4593
4594   for (i = 0; i < vec_len (to_re_add); i++)
4595     {
4596       n = pool_elt_at_index (nm->neighbor_pool, to_re_add[i]);
4597       ip6_neighbor_adj_fib_remove (n, old_fib_index);
4598       ip6_neighbor_adj_fib_add (n, new_fib_index);
4599     }
4600   vec_free (to_re_add);
4601 }
4602
4603 static clib_error_t *
4604 ip6_neighbor_init (vlib_main_t * vm)
4605 {
4606   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4607   ip6_main_t *im = &ip6_main;
4608
4609   mhash_init (&nm->neighbor_index_by_key,
4610               /* value size */ sizeof (uword),
4611               /* key size */ sizeof (ip6_neighbor_key_t));
4612
4613   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
4614                        ip6_icmp_neighbor_solicitation_node.index);
4615   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
4616                        ip6_icmp_neighbor_advertisement_node.index);
4617   icmp6_register_type (vm, ICMP6_router_solicitation,
4618                        ip6_icmp_router_solicitation_node.index);
4619   icmp6_register_type (vm, ICMP6_router_advertisement,
4620                        ip6_icmp_router_advertisement_node.index);
4621
4622   /* handler node for ip6 neighbor discovery events and timers */
4623   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
4624
4625   /* add call backs */
4626   ip6_add_del_interface_address_callback_t cb;
4627   clib_memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
4628
4629   /* when an interface address changes... */
4630   cb.function = ip6_neighbor_add_del_interface_address;
4631   cb.function_opaque = 0;
4632   vec_add1 (im->add_del_interface_address_callbacks, cb);
4633
4634   ip6_table_bind_callback_t cbt;
4635   cbt.function = ip6_neighbor_table_bind;
4636   cbt.function_opaque = 0;
4637   vec_add1 (im->table_bind_callbacks, cbt);
4638
4639   mhash_init (&nm->pending_resolutions_by_address,
4640               /* value size */ sizeof (uword),
4641               /* key size */ sizeof (ip6_address_t));
4642
4643   mhash_init (&nm->mac_changes_by_address,
4644               /* value size */ sizeof (uword),
4645               /* key size */ sizeof (ip6_address_t));
4646
4647   /* default, configurable */
4648   nm->limit_neighbor_cache_size = 50000;
4649
4650   nm->wc_ip6_nd_publisher_node = (uword) ~ 0;
4651
4652   nm->ip6_ra_publisher_node = (uword) ~ 0;
4653
4654 #if 0
4655   /* $$$$ Hack fix for today */
4656   vec_validate_init_empty
4657     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
4658 #endif
4659
4660   return 0;
4661 }
4662
4663 VLIB_INIT_FUNCTION (ip6_neighbor_init);
4664
4665
4666 void
4667 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
4668                                              void *address_arg,
4669                                              uword node_index,
4670                                              uword type_opaque, uword data)
4671 {
4672   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4673   ip6_address_t *address = address_arg;
4674   uword *p;
4675   pending_resolution_t *pr;
4676
4677   pool_get (nm->pending_resolutions, pr);
4678
4679   pr->next_index = ~0;
4680   pr->node_index = node_index;
4681   pr->type_opaque = type_opaque;
4682   pr->data = data;
4683
4684   p = mhash_get (&nm->pending_resolutions_by_address, address);
4685   if (p)
4686     {
4687       /* Insert new resolution at the head of the list */
4688       pr->next_index = p[0];
4689       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
4690     }
4691
4692   mhash_set (&nm->pending_resolutions_by_address, address,
4693              pr - nm->pending_resolutions, 0 /* old value */ );
4694 }
4695
4696 int
4697 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
4698                                   void *data_callback,
4699                                   u32 pid,
4700                                   void *address_arg,
4701                                   uword node_index,
4702                                   uword type_opaque, uword data, int is_add)
4703 {
4704   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4705   ip6_address_t *address = address_arg;
4706
4707   /* Try to find an existing entry */
4708   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
4709   u32 *p = first;
4710   pending_resolution_t *mc;
4711   while (p && *p != ~0)
4712     {
4713       mc = pool_elt_at_index (nm->mac_changes, *p);
4714       if (mc->node_index == node_index && mc->type_opaque == type_opaque
4715           && mc->pid == pid)
4716         break;
4717       p = &mc->next_index;
4718     }
4719
4720   int found = p && *p != ~0;
4721   if (is_add)
4722     {
4723       if (found)
4724         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
4725
4726       pool_get (nm->mac_changes, mc);
4727       /* *INDENT-OFF* */
4728       *mc = (pending_resolution_t)
4729       {
4730         .next_index = ~0,
4731         .node_index = node_index,
4732         .type_opaque = type_opaque,
4733         .data = data,
4734         .data_callback = data_callback,
4735         .pid = pid,
4736       };
4737       /* *INDENT-ON* */
4738
4739       /* Insert new resolution at the end of the list */
4740       u32 new_idx = mc - nm->mac_changes;
4741       if (p)
4742         p[0] = new_idx;
4743       else
4744         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
4745     }
4746   else
4747     {
4748       if (!found)
4749         return VNET_API_ERROR_NO_SUCH_ENTRY;
4750
4751       /* Clients may need to clean up pool entries, too */
4752       void (*fp) (u32, u8 *) = data_callback;
4753       if (fp)
4754         (*fp) (mc->data, 0 /* no new mac addrs */ );
4755
4756       /* Remove the entry from the list and delete the entry */
4757       *p = mc->next_index;
4758       pool_put (nm->mac_changes, mc);
4759
4760       /* Remove from hash if we deleted the last entry */
4761       if (*p == ~0 && p == first)
4762         mhash_unset (&nm->mac_changes_by_address, address, 0);
4763     }
4764   return 0;
4765 }
4766
4767 int
4768 vnet_ip6_nd_term (vlib_main_t * vm,
4769                   vlib_node_runtime_t * node,
4770                   vlib_buffer_t * p0,
4771                   ethernet_header_t * eth,
4772                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4773 {
4774   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4775   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4776
4777   ndh = ip6_next_header (ip);
4778   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4779       ndh->icmp.type != ICMP6_neighbor_advertisement)
4780     return 0;
4781
4782   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4783                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4784     {
4785       u8 *t0 = vlib_add_trace (vm, node, p0,
4786                                sizeof (icmp6_input_trace_t));
4787       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4788     }
4789
4790   /* Check if anyone want ND events for L2 BDs */
4791   if (PREDICT_FALSE
4792       (nm->wc_ip6_nd_publisher_node != (uword) ~ 0
4793        && !ip6_address_is_link_local_unicast (&ip->src_address)))
4794     {
4795       vnet_nd_wc_publish (sw_if_index, eth->src_address, &ip->src_address);
4796     }
4797
4798   /* Check if MAC entry exsist for solicited target IP */
4799   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4800     {
4801       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4802       l2_bridge_domain_t *bd_config;
4803       u8 *macp;
4804
4805       opt = (void *) (ndh + 1);
4806       if ((opt->header.type !=
4807            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4808           (opt->header.n_data_u64s != 1))
4809         return 0;               /* source link layer address option not present */
4810
4811       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4812       macp =
4813         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4814       if (macp)
4815         {                       /* found ip-mac entry, generate eighbor advertisement response */
4816           int bogus_length;
4817           vlib_node_runtime_t *error_node =
4818             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4819           ip->dst_address = ip->src_address;
4820           ip->src_address = ndh->target_address;
4821           ip->hop_limit = 255;
4822           opt->header.type =
4823             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4824           clib_memcpy (opt->ethernet_address, macp, 6);
4825           ndh->icmp.type = ICMP6_neighbor_advertisement;
4826           ndh->advertisement_flags = clib_host_to_net_u32
4827             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4828              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4829           ndh->icmp.checksum = 0;
4830           ndh->icmp.checksum =
4831             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4832           clib_memcpy (eth->dst_address, eth->src_address, 6);
4833           clib_memcpy (eth->src_address, macp, 6);
4834           vlib_error_count (vm, error_node->node_index,
4835                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4836           return 1;
4837         }
4838     }
4839
4840   return 0;
4841
4842 }
4843
4844 int
4845 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4846 {
4847   u32 fib_index;
4848
4849   fib_prefix_t pfx = {
4850     .fp_len = 128,
4851     .fp_proto = FIB_PROTOCOL_IP6,
4852     .fp_addr = {
4853                 .ip6 = *addr,
4854                 },
4855   };
4856   ip46_address_t nh = {
4857     .ip6 = *addr,
4858   };
4859
4860   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4861
4862   if (~0 == fib_index)
4863     return VNET_API_ERROR_NO_SUCH_FIB;
4864
4865   if (is_del)
4866     {
4867       fib_table_entry_path_remove (fib_index,
4868                                    &pfx,
4869                                    FIB_SOURCE_IP6_ND_PROXY,
4870                                    DPO_PROTO_IP6,
4871                                    &nh,
4872                                    sw_if_index,
4873                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4874       /* flush the ND cache of this address if it's there */
4875       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (), sw_if_index, addr);
4876     }
4877   else
4878     {
4879       fib_table_entry_path_add (fib_index,
4880                                 &pfx,
4881                                 FIB_SOURCE_IP6_ND_PROXY,
4882                                 FIB_ENTRY_FLAG_NONE,
4883                                 DPO_PROTO_IP6,
4884                                 &nh,
4885                                 sw_if_index,
4886                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4887     }
4888   return (0);
4889 }
4890
4891 static clib_error_t *
4892 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4893                       unformat_input_t * input, vlib_cli_command_t * cmd)
4894 {
4895   vnet_main_t *vnm = vnet_get_main ();
4896   clib_error_t *error = 0;
4897   ip6_address_t addr;
4898   u32 sw_if_index;
4899   u8 is_del = 0;
4900
4901   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4902     {
4903       /* get the rest of the command */
4904       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4905         {
4906           if (unformat (input, "%U", unformat_ip6_address, &addr))
4907             break;
4908           else if (unformat (input, "delete") || unformat (input, "del"))
4909             is_del = 1;
4910           else
4911             return (unformat_parse_error (input));
4912         }
4913     }
4914
4915   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4916
4917   return error;
4918 }
4919
4920 /* *INDENT-OFF* */
4921 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4922 {
4923   .path = "set ip6 nd proxy",
4924   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4925   .function = set_ip6_nd_proxy_cmd,
4926 };
4927 /* *INDENT-ON* */
4928
4929 void
4930 ethernet_ndp_change_mac (u32 sw_if_index)
4931 {
4932   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4933   ip6_neighbor_t *n;
4934   adj_index_t ai;
4935
4936   /* *INDENT-OFF* */
4937   pool_foreach (n, nm->neighbor_pool,
4938   ({
4939     if (n->key.sw_if_index == sw_if_index)
4940       {
4941         adj_nbr_walk_nh6 (sw_if_index,
4942                           &n->key.ip6_address,
4943                           ip6_nd_mk_complete_walk, n);
4944       }
4945   }));
4946   /* *INDENT-ON* */
4947
4948   ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index);
4949
4950   if (ADJ_INDEX_INVALID != ai)
4951     adj_glean_update_rewrite (ai);
4952 }
4953
4954 void
4955 send_ip6_na (vlib_main_t * vm, u32 sw_if_index)
4956 {
4957   ip6_main_t *i6m = &ip6_main;
4958   ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index);
4959
4960   send_ip6_na_w_addr (vm, ip6_addr, sw_if_index);
4961 }
4962
4963 void
4964 send_ip6_na_w_addr (vlib_main_t * vm,
4965                     const ip6_address_t * ip6_addr, u32 sw_if_index)
4966 {
4967   ip6_main_t *i6m = &ip6_main;
4968   vnet_main_t *vnm = vnet_get_main ();
4969   u8 *rewrite, rewrite_len;
4970   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
4971   u8 dst_address[6];
4972
4973   if (ip6_addr)
4974     {
4975       clib_warning
4976         ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
4977          format_ip6_address, ip6_addr, sw_if_index);
4978
4979       /* Form unsolicited neighbor advertisement packet from NS pkt template */
4980       int bogus_length;
4981       u32 bi = 0;
4982       icmp6_neighbor_solicitation_header_t *h =
4983         vlib_packet_template_get_packet (vm,
4984                                          &i6m->discover_neighbor_packet_template,
4985                                          &bi);
4986       if (!h)
4987         return;
4988
4989       ip6_set_reserved_multicast_address (&h->ip.dst_address,
4990                                           IP6_MULTICAST_SCOPE_link_local,
4991                                           IP6_MULTICAST_GROUP_ID_all_hosts);
4992       h->ip.src_address = ip6_addr[0];
4993       h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
4994       h->neighbor.target_address = ip6_addr[0];
4995       h->neighbor.advertisement_flags = clib_host_to_net_u32
4996         (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4997       h->link_layer_option.header.type =
4998         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4999       clib_memcpy (h->link_layer_option.ethernet_address,
5000                    hi->hw_address, vec_len (hi->hw_address));
5001       h->neighbor.icmp.checksum =
5002         ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
5003       ASSERT (bogus_length == 0);
5004
5005       /* Setup MAC header with IP6 Etype and mcast DMAC */
5006       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
5007       ip6_multicast_ethernet_address (dst_address,
5008                                       IP6_MULTICAST_GROUP_ID_all_hosts);
5009       rewrite =
5010         ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address);
5011       rewrite_len = vec_len (rewrite);
5012       vlib_buffer_advance (b, -rewrite_len);
5013       ethernet_header_t *e = vlib_buffer_get_current (b);
5014       clib_memcpy (e->dst_address, rewrite, rewrite_len);
5015       vec_free (rewrite);
5016
5017       /* Send unsolicited ND advertisement packet out the specified interface */
5018       vnet_buffer (b)->sw_if_index[VLIB_RX] =
5019         vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
5020       vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
5021       u32 *to_next = vlib_frame_vector_args (f);
5022       to_next[0] = bi;
5023       f->n_vectors = 1;
5024       vlib_put_frame_to_node (vm, hi->output_node_index, f);
5025     }
5026 }
5027
5028 /*
5029  * fd.io coding-style-patch-verification: ON
5030  *
5031  * Local Variables:
5032  * eval: (c-set-style "gnu")
5033  * End:
5034  */