src/vnet/ip/ip6_neighbor.c

   1 /*
   2  * ip/ip6_neighbor.c: IP6 neighbor handling
   3  *
   4  * Copyright (c) 2010 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vnet/ip/ip.h>
  19 #include <vnet/ip/ip6_neighbor.h>
  20 #include <vnet/ethernet/ethernet.h>
  21 #include <vppinfra/mhash.h>
  22 #include <vnet/adj/adj.h>
  23 #include <vnet/adj/adj_mcast.h>
  24 #include <vnet/fib/fib_table.h>
  25 #include <vnet/fib/ip6_fib.h>
  26 #include <vnet/mfib/ip6_mfib.h>
  27 #include <vnet/ip/ip6_ll_table.h>
  28 #include <vnet/l2/l2_input.h>
  29 #include <vlibmemory/api.h>
  30
  31 /**
  32  * @file
  33  * @brief IPv6 Neighbor Adjacency and Neighbor Discovery.
  34  *
  35  * The files contains the API and CLI code for managing IPv6 neighbor
  36  * adjacency tables and neighbor discovery logic.
  37  */
  38
  39 /* can't use sizeof link_layer_address, that's 8 */
  40 #define ETHER_MAC_ADDR_LEN 6
  41
  42 /* advertised prefix option */
  43 typedef struct
  44 {
  45   /* basic advertised information */
  46   ip6_address_t prefix;
  47   u8 prefix_len;
  48   int adv_on_link_flag;
  49   int adv_autonomous_flag;
  50   u32 adv_valid_lifetime_in_secs;
  51   u32 adv_pref_lifetime_in_secs;
  52
  53   /* advertised values are computed from these times if decrementing */
  54   f64 valid_lifetime_expires;
  55   f64 pref_lifetime_expires;
  56
  57   /* local information */
  58   int enabled;
  59   int deprecated_prefix_flag;
  60   int decrement_lifetime_flag;
  61
  62 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  63 #define DEF_ADV_VALID_LIFETIME  2592000
  64 #define DEF_ADV_PREF_LIFETIME 604800
  65
  66   /* extensions are added here, mobile, DNS etc.. */
  67 } ip6_radv_prefix_t;
  68
  69
  70 typedef struct
  71 {
  72   /* group information */
  73   u8 type;
  74   ip6_address_t mcast_address;
  75   u16 num_sources;
  76   ip6_address_t *mcast_source_address_pool;
  77 } ip6_mldp_group_t;
  78
  79 /* configured router advertisement information per ipv6 interface */
  80 typedef struct
  81 {
  82
  83   /* advertised config information, zero means unspecified  */
  84   u8 curr_hop_limit;
  85   int adv_managed_flag;
  86   int adv_other_flag;
  87   u16 adv_router_lifetime_in_sec;
  88   u32 adv_neighbor_reachable_time_in_msec;
  89   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
  90
  91   /* mtu option */
  92   u32 adv_link_mtu;
  93
  94   /* source link layer option */
  95   u8 link_layer_address[8];
  96   u8 link_layer_addr_len;
  97
  98   /* prefix option */
  99   ip6_radv_prefix_t *adv_prefixes_pool;
 100
 101   /* Hash table mapping address to index in interface advertised  prefix pool. */
 102   mhash_t address_to_prefix_index;
 103
 104   /* MLDP  group information */
 105   ip6_mldp_group_t *mldp_group_pool;
 106
 107   /* Hash table mapping address to index in mldp address pool. */
 108   mhash_t address_to_mldp_index;
 109
 110   /* local information */
 111   u32 sw_if_index;
 112   int send_radv;                /* radv on/off on this interface -  set by config */
 113   int cease_radv;               /* we are ceasing  to send  - set byf config */
 114   int send_unicast;
 115   int adv_link_layer_address;
 116   int prefix_option;
 117   int failed_device_check;
 118   int all_routers_mcast;
 119   u32 seed;
 120   u64 randomizer;
 121   int ref_count;
 122   adj_index_t mcast_adj_index;
 123
 124   /* timing information */
 125 #define DEF_MAX_RADV_INTERVAL 200
 126 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
 127 #define DEF_CURR_HOP_LIMIT  64
 128 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
 129 #define MAX_DEF_RTR_LIFETIME   9000
 130
 131 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
 132 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
 133 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
 134 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
 135 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
 136
 137   f64 max_radv_interval;
 138   f64 min_radv_interval;
 139   f64 min_delay_between_radv;
 140   f64 max_delay_between_radv;
 141   f64 max_rtr_default_lifetime;
 142
 143   f64 last_radv_time;
 144   f64 last_multicast_time;
 145   f64 next_multicast_time;
 146
 147
 148   u32 initial_adverts_count;
 149   f64 initial_adverts_interval;
 150   u32 initial_adverts_sent;
 151
 152   /* stats */
 153   u32 n_advertisements_sent;
 154   u32 n_solicitations_rcvd;
 155   u32 n_solicitations_dropped;
 156
 157   /* Link local address to use (defaults to underlying physical for logical interfaces */
 158   ip6_address_t link_local_address;
 159
 160   /* router solicitations sending state */
 161   u8 keep_sending_rs;           /* when true then next fields are valid */
 162   icmp6_send_router_solicitation_params_t params;
 163   f64 sleep_interval;
 164   f64 due_time;
 165   u32 n_left;
 166   f64 start_time;
 167   vlib_buffer_t *buffer;
 168 } ip6_radv_t;
 169
 170 typedef struct
 171 {
 172   u32 next_index;
 173   uword node_index;
 174   uword type_opaque;
 175   uword data;
 176   /* Used for nd event notification only */
 177   ip6_nd_change_event_cb_t data_callback;
 178   u32 pid;
 179 } pending_resolution_t;
 180
 181
 182 typedef struct
 183 {
 184   /* Hash tables mapping name to opcode. */
 185   uword *opcode_by_name;
 186
 187   /* lite beer "glean" adjacency handling */
 188   mhash_t pending_resolutions_by_address;
 189   pending_resolution_t *pending_resolutions;
 190
 191   /* Mac address change notification */
 192   mhash_t mac_changes_by_address;
 193   pending_resolution_t *mac_changes;
 194
 195   u32 *neighbor_input_next_index_by_hw_if_index;
 196
 197   ip6_neighbor_t *neighbor_pool;
 198
 199   mhash_t neighbor_index_by_key;
 200
 201   u32 *if_radv_pool_index_by_sw_if_index;
 202
 203   ip6_radv_t *if_radv_pool;
 204
 205   /* Neighbor attack mitigation */
 206   u32 limit_neighbor_cache_size;
 207   u32 neighbor_delete_rotor;
 208
 209   /* Wildcard nd report publisher */
 210   uword wc_ip6_nd_publisher_node;
 211   uword wc_ip6_nd_publisher_et;
 212
 213   /* Router advertisement report publisher */
 214   uword ip6_ra_publisher_node;
 215   uword ip6_ra_publisher_et;
 216 } ip6_neighbor_main_t;
 217
 218 /* ipv6 neighbor discovery - timer/event types */
 219 typedef enum
 220 {
 221   ICMP6_ND_EVENT_INIT,
 222 } ip6_icmp_neighbor_discovery_event_type_t;
 223
 224 typedef union
 225 {
 226   u32 add_del_swindex;
 227   struct
 228   {
 229     u32 up_down_swindex;
 230     u32 fib_index;
 231   } up_down_event;
 232 } ip6_icmp_neighbor_discovery_event_data_t;
 233
 234 static ip6_neighbor_main_t ip6_neighbor_main;
 235 ip6_neighbor_public_main_t ip6_neighbor_public_main;
 236 static ip6_address_t ip6a_zero; /* ip6 address 0 */
 237
 238 static void wc_nd_signal_report (wc_nd_report_t * r);
 239 static void ra_signal_report (ra_report_t * r);
 240
 241 ip6_address_t
 242 ip6_neighbor_get_link_local_address (u32 sw_if_index)
 243 {
 244   static ip6_address_t empty_address = { {0} };
 245   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 246   ip6_radv_t *radv_info;
 247   u32 ri = ~0;
 248
 249   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index)
 250     ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
 251   if (ri == ~0)
 252     {
 253       clib_warning ("IPv6 is not enabled for sw_if_index %d", sw_if_index);
 254       return empty_address;
 255     }
 256   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
 257   if (radv_info == NULL)
 258     {
 259       clib_warning ("Internal error");
 260       return empty_address;
 261     }
 262   return radv_info->link_local_address;
 263 }
 264
 265 /**
 266  * @brief publish wildcard arp event
 267  * @param sw_if_index The interface on which the ARP entires are acted
 268  */
 269 static int
 270 vnet_nd_wc_publish (u32 sw_if_index,
 271                     const mac_address_t * mac, const ip6_address_t * ip6)
 272 {
 273   wc_nd_report_t r = {
 274     .sw_if_index = sw_if_index,
 275     .ip6 = *ip6,
 276     .mac = *mac,
 277   };
 278
 279   vl_api_rpc_call_main_thread (wc_nd_signal_report, (u8 *) & r, sizeof r);
 280   return 0;
 281 }
 282
 283 static void
 284 wc_nd_signal_report (wc_nd_report_t * r)
 285 {
 286   vlib_main_t *vm = vlib_get_main ();
 287   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 288   uword ni = nm->wc_ip6_nd_publisher_node;
 289   uword et = nm->wc_ip6_nd_publisher_et;
 290
 291   if (ni == (uword) ~ 0)
 292     return;
 293   wc_nd_report_t *q =
 294     vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 295
 296   *q = *r;
 297 }
 298
 299 void
 300 wc_nd_set_publisher_node (uword node_index, uword event_type)
 301 {
 302   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 303   nm->wc_ip6_nd_publisher_node = node_index;
 304   nm->wc_ip6_nd_publisher_et = event_type;
 305 }
 306
 307 static int
 308 ra_publish (ra_report_t * r)
 309 {
 310   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 311   vl_api_rpc_call_main_thread (ra_signal_report, (u8 *) r, sizeof *r);
 312   return 0;
 313 }
 314
 315 static void
 316 ra_signal_report (ra_report_t * r)
 317 {
 318   vlib_main_t *vm = vlib_get_main ();
 319   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 320   uword ni = nm->ip6_ra_publisher_node;
 321   uword et = nm->ip6_ra_publisher_et;
 322
 323   if (ni == (uword) ~ 0)
 324     return;
 325   ra_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
 326
 327   *q = *r;
 328 }
 329
 330 void
 331 ra_set_publisher_node (uword node_index, uword event_type)
 332 {
 333   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 334   nm->ip6_ra_publisher_node = node_index;
 335   nm->ip6_ra_publisher_et = event_type;
 336 }
 337
 338 static u8 *
 339 format_ip6_neighbor_ip6_entry (u8 * s, va_list * va)
 340 {
 341   vlib_main_t *vm = va_arg (*va, vlib_main_t *);
 342   ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *);
 343   vnet_main_t *vnm = vnet_get_main ();
 344   vnet_sw_interface_t *si;
 345   u8 *flags = 0;
 346
 347   if (!n)
 348     return format (s, "%=12s%=45s%=6s%=20s%=40s", "Time", "Address", "Flags",
 349                    "Link layer", "Interface");
 350
 351   if (n->flags & IP_NEIGHBOR_FLAG_DYNAMIC)
 352     flags = format (flags, "D");
 353
 354   if (n->flags & IP_NEIGHBOR_FLAG_STATIC)
 355     flags = format (flags, "S");
 356
 357   if (n->flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY)
 358     flags = format (flags, "N");
 359
 360   si = vnet_get_sw_interface (vnm, n->key.sw_if_index);
 361   s = format (s, "%=12U%=45U%=6s%=20U%=40U",
 362               format_vlib_time, vm, n->time_last_updated,
 363               format_ip6_address, &n->key.ip6_address,
 364               flags ? (char *) flags : "",
 365               format_mac_address_t, &n->mac,
 366               format_vnet_sw_interface_name, vnm, si);
 367
 368   vec_free (flags);
 369   return s;
 370 }
 371
 372 static void
 373 ip6_neighbor_adj_fib_remove (ip6_neighbor_t * n, u32 fib_index)
 374 {
 375   if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 376     {
 377       if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 378         {
 379           ip6_ll_prefix_t pfx = {
 380             .ilp_addr = n->key.ip6_address,
 381             .ilp_sw_if_index = n->key.sw_if_index,
 382           };
 383           ip6_ll_table_entry_delete (&pfx);
 384         }
 385       else
 386         {
 387           fib_prefix_t pfx = {
 388             .fp_len = 128,
 389             .fp_proto = FIB_PROTOCOL_IP6,
 390             .fp_addr.ip6 = n->key.ip6_address,
 391           };
 392           fib_table_entry_path_remove (fib_index,
 393                                        &pfx,
 394                                        FIB_SOURCE_ADJ,
 395                                        DPO_PROTO_IP6,
 396                                        &pfx.fp_addr,
 397                                        n->key.sw_if_index, ~0,
 398                                        1, FIB_ROUTE_PATH_FLAG_NONE);
 399         }
 400     }
 401 }
 402
 403 typedef struct
 404 {
 405   u8 is_add;
 406   ip_neighbor_flags_t flags;
 407   mac_address_t mac;
 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 mac_address_t * mac, int is_add, ip_neighbor_flags_t flags)
 420 {
 421   ip6_neighbor_set_unset_rpc_args_t args;
 422   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 423
 424   args.sw_if_index = sw_if_index;
 425   args.is_add = is_add;
 426   args.flags = flags;
 427   ip6_address_copy (&args.addr, a);
 428   mac_address_copy (&args.mac, mac);
 429
 430   vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback,
 431                                (u8 *) & args, sizeof (args));
 432 }
 433
 434 static void
 435 ip6_nbr_probe (ip_adjacency_t * adj)
 436 {
 437   icmp6_neighbor_solicitation_header_t *h;
 438   vnet_main_t *vnm = vnet_get_main ();
 439   ip6_main_t *im = &ip6_main;
 440   ip_interface_address_t *ia;
 441   ip6_address_t *dst, *src;
 442   vnet_hw_interface_t *hi;
 443   vnet_sw_interface_t *si;
 444   vlib_buffer_t *b;
 445   int bogus_length;
 446   vlib_main_t *vm;
 447   u32 bi = 0;
 448
 449   vm = vlib_get_main ();
 450
 451   si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
 452   dst = &adj->sub_type.nbr.next_hop.ip6;
 453
 454   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 455     {
 456       return;
 457     }
 458   src = ip6_interface_address_matching_destination (im, dst,
 459                                                     adj->rewrite_header.
 460                                                     sw_if_index, &ia);
 461   if (!src)
 462     {
 463       return;
 464     }
 465
 466   h = vlib_packet_template_get_packet (vm,
 467                                        &im->discover_neighbor_packet_template,
 468                                        &bi);
 469   if (!h)
 470     return;
 471
 472   hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
 473
 474   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
 475   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
 476   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
 477   h->ip.src_address = src[0];
 478   h->neighbor.target_address = dst[0];
 479
 480   clib_memcpy (h->link_layer_option.ethernet_address,
 481                hi->hw_address, vec_len (hi->hw_address));
 482
 483   h->neighbor.icmp.checksum =
 484     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
 485   ASSERT (bogus_length == 0);
 486
 487   b = vlib_get_buffer (vm, bi);
 488   vnet_buffer (b)->sw_if_index[VLIB_RX] =
 489     vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
 490
 491   /* Add encapsulation string for software interface (e.g. ethernet header). */
 492   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
 493   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
 494
 495   {
 496     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
 497     u32 *to_next = vlib_frame_vector_args (f);
 498     to_next[0] = bi;
 499     f->n_vectors = 1;
 500     vlib_put_frame_to_node (vm, hi->output_node_index, f);
 501   }
 502 }
 503
 504 static void
 505 ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr)
 506 {
 507   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 508                           ethernet_build_rewrite (vnet_get_main (),
 509                                                   nbr->key.sw_if_index,
 510                                                   adj_get_link_type (ai),
 511                                                   nbr->mac.bytes));
 512 }
 513
 514 static void
 515 ip6_nd_mk_incomplete (adj_index_t ai)
 516 {
 517   ip_adjacency_t *adj = adj_get (ai);
 518
 519   adj_nbr_update_rewrite (ai,
 520                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 521                           ethernet_build_rewrite (vnet_get_main (),
 522                                                   adj->rewrite_header.
 523                                                   sw_if_index,
 524                                                   adj_get_link_type (ai),
 525                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 526 }
 527
 528 #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \
 529 {                                            \
 530     k.sw_if_index = sw_if_index;             \
 531     k.ip6_address = *addr;                   \
 532     k.pad = 0;                               \
 533 }
 534
 535 static ip6_neighbor_t *
 536 ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr)
 537 {
 538   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 539   ip6_neighbor_t *n = NULL;
 540   ip6_neighbor_key_t k;
 541   uword *p;
 542
 543   IP6_NBR_MK_KEY (k, sw_if_index, addr);
 544
 545   p = mhash_get (&nm->neighbor_index_by_key, &k);
 546   if (p)
 547     {
 548       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 549     }
 550
 551   return (n);
 552 }
 553
 554 static adj_walk_rc_t
 555 ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx)
 556 {
 557   ip6_neighbor_t *nbr = ctx;
 558
 559   ip6_nd_mk_complete (ai, nbr);
 560
 561   return (ADJ_WALK_RC_CONTINUE);
 562 }
 563
 564 static adj_walk_rc_t
 565 ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx)
 566 {
 567   ip6_nd_mk_incomplete (ai);
 568
 569   return (ADJ_WALK_RC_CONTINUE);
 570 }
 571
 572 static clib_error_t *
 573 ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
 574                                    u32 sw_if_index, u32 flags)
 575 {
 576   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 577   ip6_neighbor_t *n;
 578   u32 i, *to_delete = 0;
 579
 580   /* *INDENT-OFF* */
 581   pool_foreach (n, nm->neighbor_pool,
 582   ({
 583     if (n->key.sw_if_index == sw_if_index)
 584       vec_add1 (to_delete, n - nm->neighbor_pool);
 585   }));
 586   /* *INDENT-ON* */
 587
 588   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
 589     {
 590       for (i = 0; i < vec_len (to_delete); i++)
 591         {
 592           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 593           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 594                             ip6_nd_mk_complete_walk, n);
 595         }
 596     }
 597   else
 598     {
 599       for (i = 0; i < vec_len (to_delete); i++)
 600         {
 601           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 602           adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address,
 603                             ip6_nd_mk_incomplete_walk, NULL);
 604           if (n->flags & IP_NEIGHBOR_FLAG_STATIC)
 605             continue;
 606           ip6_neighbor_adj_fib_remove (n,
 607                                        ip6_fib_table_get_index_for_sw_if_index
 608                                        (n->key.sw_if_index));
 609           mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 610           pool_put (nm->neighbor_pool, n);
 611         }
 612     }
 613
 614   vec_free (to_delete);
 615   return 0;
 616 }
 617
 618 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down);
 619
 620 void
 621 ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 622 {
 623   ip6_neighbor_t *nbr;
 624   ip_adjacency_t *adj;
 625
 626   adj = adj_get (ai);
 627
 628   nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6);
 629
 630   switch (adj->lookup_next_index)
 631     {
 632     case IP_LOOKUP_NEXT_GLEAN:
 633       adj_glean_update_rewrite (ai);
 634       break;
 635     case IP_LOOKUP_NEXT_ARP:
 636       if (NULL != nbr)
 637         {
 638           adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
 639                             ip6_nd_mk_complete_walk, nbr);
 640         }
 641       else
 642         {
 643           /*
 644            * no matching ND entry.
 645            * construct the rewrite required to for an ND packet, and stick
 646            * that in the adj's pipe to smoke.
 647            */
 648           adj_nbr_update_rewrite (ai,
 649                                   ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 650                                   ethernet_build_rewrite (vnm,
 651                                                           sw_if_index,
 652                                                           VNET_LINK_IP6,
 653                                                           VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 654
 655           /*
 656            * since the FIB has added this adj for a route, it makes sense it may
 657            * want to forward traffic sometime soon. Let's send a speculative ND.
 658            * just one. If we were to do periodically that wouldn't be bad either,
 659            * but that's more code than i'm prepared to write at this time for
 660            * relatively little reward.
 661            */
 662           ip6_nbr_probe (adj);
 663         }
 664       break;
 665     case IP_LOOKUP_NEXT_BCAST:
 666       adj_nbr_update_rewrite (ai,
 667                               ADJ_NBR_REWRITE_FLAG_COMPLETE,
 668                               ethernet_build_rewrite (vnm,
 669                                                       sw_if_index,
 670                                                       VNET_LINK_IP6,
 671                                                       VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 672       break;
 673     case IP_LOOKUP_NEXT_MCAST:
 674       {
 675         /*
 676          * Construct a partial rewrite from the known ethernet mcast dest MAC
 677          */
 678         u8 *rewrite;
 679         u8 offset;
 680
 681         rewrite = ethernet_build_rewrite (vnm,
 682                                           sw_if_index,
 683                                           adj->ia_link,
 684                                           ethernet_ip6_mcast_dst_addr ());
 685
 686         /*
 687          * Complete the remaining fields of the adj's rewrite to direct the
 688          * complete of the rewrite at switch time by copying in the IP
 689          * dst address's bytes.
 690          * Ofset is 2 bytes into the desintation address.
 691          */
 692         offset = vec_len (rewrite) - 2;
 693         adj_mcast_update_rewrite (ai, rewrite, offset);
 694
 695         break;
 696       }
 697     case IP_LOOKUP_NEXT_DROP:
 698     case IP_LOOKUP_NEXT_PUNT:
 699     case IP_LOOKUP_NEXT_LOCAL:
 700     case IP_LOOKUP_NEXT_REWRITE:
 701     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 702     case IP_LOOKUP_NEXT_MIDCHAIN:
 703     case IP_LOOKUP_NEXT_ICMP_ERROR:
 704     case IP_LOOKUP_N_NEXT:
 705       ASSERT (0);
 706       break;
 707     }
 708 }
 709
 710
 711 static void
 712 ip6_neighbor_adj_fib_add (ip6_neighbor_t * n, u32 fib_index)
 713 {
 714   if (ip6_address_is_link_local_unicast (&n->key.ip6_address))
 715     {
 716       ip6_ll_prefix_t pfx = {
 717         .ilp_addr = n->key.ip6_address,
 718         .ilp_sw_if_index = n->key.sw_if_index,
 719       };
 720       n->fib_entry_index =
 721         ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE);
 722     }
 723   else
 724     {
 725       fib_prefix_t pfx = {
 726         .fp_len = 128,
 727         .fp_proto = FIB_PROTOCOL_IP6,
 728         .fp_addr.ip6 = n->key.ip6_address,
 729       };
 730
 731       n->fib_entry_index =
 732         fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 733                                   FIB_ENTRY_FLAG_ATTACHED,
 734                                   DPO_PROTO_IP6, &pfx.fp_addr,
 735                                   n->key.sw_if_index, ~0, 1, NULL,
 736                                   FIB_ROUTE_PATH_FLAG_NONE);
 737     }
 738 }
 739
 740 static ip6_neighbor_t *
 741 force_reuse_neighbor_entry (void)
 742 {
 743   ip6_neighbor_t *n;
 744   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 745   u32 count = 0;
 746   u32 index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 747   if (index == ~0)              /* Try again from elt 0 */
 748     index = pool_next_index (nm->neighbor_pool, index);
 749
 750   /* Find a non-static random entry to free up for reuse */
 751   do
 752     {
 753       if ((count++ == 100) || (index == ~0))
 754         return NULL;            /* give up after 100 entries */
 755       n = pool_elt_at_index (nm->neighbor_pool, index);
 756       nm->neighbor_delete_rotor = index;
 757       index = pool_next_index (nm->neighbor_pool, index);
 758     }
 759   while (n->flags & IP_NEIGHBOR_FLAG_STATIC);
 760
 761   /* Remove ARP entry from its interface and update fib */
 762   adj_nbr_walk_nh6 (n->key.sw_if_index,
 763                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 764   ip6_neighbor_adj_fib_remove
 765     (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 766   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 767
 768   return n;
 769 }
 770
 771 int
 772 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 773                                 u32 sw_if_index,
 774                                 const ip6_address_t * a,
 775                                 const mac_address_t * mac,
 776                                 ip_neighbor_flags_t flags)
 777 {
 778   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 779   ip6_neighbor_key_t k;
 780   ip6_neighbor_t *n = 0;
 781   int make_new_nd_cache_entry = 1;
 782   uword *p;
 783   u32 next_index;
 784   pending_resolution_t *pr, *mc;
 785
 786   if (vlib_get_thread_index ())
 787     {
 788       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, mac, 1, flags);
 789       return 0;
 790     }
 791
 792   k.sw_if_index = sw_if_index;
 793   k.ip6_address = a[0];
 794   k.pad = 0;
 795
 796   p = mhash_get (&nm->neighbor_index_by_key, &k);
 797   if (p)
 798     {
 799       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 800       /* Refuse to over-write static neighbor entry. */
 801       if (!(flags & IP_NEIGHBOR_FLAG_STATIC) &&
 802           (n->flags & IP_NEIGHBOR_FLAG_STATIC))
 803         {
 804           /* if MAC address match, still check to send event */
 805           if (0 == mac_address_cmp (&n->mac, mac))
 806             goto check_customers;
 807           return -2;
 808         }
 809       make_new_nd_cache_entry = 0;
 810     }
 811
 812   if (make_new_nd_cache_entry)
 813     {
 814       if (nm->limit_neighbor_cache_size &&
 815           pool_elts (nm->neighbor_pool) >= nm->limit_neighbor_cache_size)
 816         {
 817           n = force_reuse_neighbor_entry ();
 818           if (NULL == n)
 819             return -2;
 820         }
 821       else
 822         pool_get (nm->neighbor_pool, n);
 823
 824       mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
 825                  /* old value */ 0);
 826       n->key = k;
 827       n->fib_entry_index = FIB_NODE_INDEX_INVALID;
 828
 829       mac_address_copy (&n->mac, mac);
 830
 831       /*
 832        * create the adj-fib. the entry in the FIB table for and to the peer.
 833        */
 834       if (!(flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY))
 835         {
 836           ip6_neighbor_adj_fib_add
 837             (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index));
 838         }
 839       else
 840         {
 841           n->flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 842         }
 843     }
 844   else
 845     {
 846       /*
 847        * prevent a DoS attack from the data-plane that
 848        * spams us with no-op updates to the MAC address
 849        */
 850       if (0 == mac_address_cmp (&n->mac, mac))
 851         {
 852           n->time_last_updated = vlib_time_now (vm);
 853           goto check_customers;
 854         }
 855
 856       mac_address_copy (&n->mac, mac);
 857     }
 858
 859   /* Update time stamp and flags. */
 860   n->time_last_updated = vlib_time_now (vm);
 861   if (flags & IP_NEIGHBOR_FLAG_STATIC)
 862     {
 863       n->flags |= IP_NEIGHBOR_FLAG_STATIC;
 864       n->flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
 865     }
 866   else
 867     {
 868       n->flags |= IP_NEIGHBOR_FLAG_DYNAMIC;
 869       n->flags &= ~IP_NEIGHBOR_FLAG_STATIC;
 870     }
 871
 872   adj_nbr_walk_nh6 (sw_if_index,
 873                     &n->key.ip6_address, ip6_nd_mk_complete_walk, n);
 874
 875 check_customers:
 876   /* Customer(s) waiting for this address to be resolved? */
 877   p = mhash_get (&nm->pending_resolutions_by_address, a);
 878   if (p)
 879     {
 880       next_index = p[0];
 881
 882       while (next_index != (u32) ~ 0)
 883         {
 884           pr = pool_elt_at_index (nm->pending_resolutions, next_index);
 885           vlib_process_signal_event (vm, pr->node_index,
 886                                      pr->type_opaque, pr->data);
 887           next_index = pr->next_index;
 888           pool_put (nm->pending_resolutions, pr);
 889         }
 890
 891       mhash_unset (&nm->pending_resolutions_by_address, (void *) a, 0);
 892     }
 893
 894   /* Customer(s) requesting ND event for this address? */
 895   p = mhash_get (&nm->mac_changes_by_address, a);
 896   if (p)
 897     {
 898       next_index = p[0];
 899
 900       while (next_index != (u32) ~ 0)
 901         {
 902           int rv = 1;
 903
 904           mc = pool_elt_at_index (nm->mac_changes, next_index);
 905
 906           /* Call the user's data callback, return 1 to suppress dup events */
 907           if (mc->data_callback)
 908             rv = (mc->data_callback) (mc->data, mac, sw_if_index, &ip6a_zero);
 909           /*
 910            * Signal the resolver process, as long as the user
 911            * says they want to be notified
 912            */
 913           if (rv == 0)
 914             vlib_process_signal_event (vm, mc->node_index,
 915                                        mc->type_opaque, mc->data);
 916           next_index = mc->next_index;
 917         }
 918     }
 919
 920   return 0;
 921 }
 922
 923 int
 924 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 925                                   u32 sw_if_index, const ip6_address_t * a)
 926 {
 927   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 928   ip6_neighbor_key_t k;
 929   ip6_neighbor_t *n;
 930   uword *p;
 931   int rv = 0;
 932
 933   if (vlib_get_thread_index ())
 934     {
 935       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, NULL, 0,
 936                                   IP_NEIGHBOR_FLAG_NONE);
 937       return 0;
 938     }
 939
 940   k.sw_if_index = sw_if_index;
 941   k.ip6_address = a[0];
 942   k.pad = 0;
 943
 944   p = mhash_get (&nm->neighbor_index_by_key, &k);
 945   if (p == 0)
 946     {
 947       rv = -1;
 948       goto out;
 949     }
 950
 951   n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 952
 953   adj_nbr_walk_nh6 (sw_if_index,
 954                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 955   ip6_neighbor_adj_fib_remove
 956     (n, ip6_fib_table_get_index_for_sw_if_index (sw_if_index));
 957
 958   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 959   pool_put (nm->neighbor_pool, n);
 960
 961 out:
 962   return rv;
 963 }
 964
 965 static void ip6_neighbor_set_unset_rpc_callback
 966   (ip6_neighbor_set_unset_rpc_args_t * a)
 967 {
 968   vlib_main_t *vm = vlib_get_main ();
 969   if (a->is_add)
 970     vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 971                                     &a->mac, a->flags);
 972   else
 973     vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr);
 974 }
 975
 976 static int
 977 ip6_neighbor_sort (void *a1, void *a2)
 978 {
 979   vnet_main_t *vnm = vnet_get_main ();
 980   ip6_neighbor_t *n1 = a1, *n2 = a2;
 981   int cmp;
 982   cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index,
 983                                    n2->key.sw_if_index);
 984   if (!cmp)
 985     cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address);
 986   return cmp;
 987 }
 988
 989 ip6_neighbor_t *
 990 ip6_neighbors_pool (void)
 991 {
 992   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 993   return nm->neighbor_pool;
 994 }
 995
 996 ip6_neighbor_t *
 997 ip6_neighbors_entries (u32 sw_if_index)
 998 {
 999   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1000   ip6_neighbor_t *n, *ns = NULL;
1001
1002   /* *INDENT-OFF* */
1003   pool_foreach (n, nm->neighbor_pool,
1004   ({
1005     if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index)
1006       continue;
1007     vec_add1 (ns, n[0]);
1008   }));
1009   /* *INDENT-ON* */
1010
1011   if (ns)
1012     vec_sort_with_function (ns, ip6_neighbor_sort);
1013   return ns;
1014 }
1015
1016 static clib_error_t *
1017 show_ip6_neighbors (vlib_main_t * vm,
1018                     unformat_input_t * input, vlib_cli_command_t * cmd)
1019 {
1020   vnet_main_t *vnm = vnet_get_main ();
1021   ip6_neighbor_t *n, *ns;
1022   clib_error_t *error = 0;
1023   u32 sw_if_index;
1024   int verbose = 0;
1025
1026   if (unformat (input, "verbose"))
1027     verbose = 1;
1028
1029   /* Filter entries by interface if given. */
1030   sw_if_index = ~0;
1031   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1032
1033   ns = ip6_neighbors_entries (sw_if_index);
1034   if (ns)
1035     {
1036       /*
1037        * Show the entire table if it's not too big, otherwise just
1038        * show the size of the table.
1039        */
1040       if (vec_len (ns) < 50)
1041         verbose = 1;
1042       if (verbose)
1043         {
1044           vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0);
1045           vec_foreach (n, ns)
1046           {
1047             vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n);
1048           }
1049         }
1050       else
1051         vlib_cli_output
1052           (vm, "There are %u ip6 neighbors, "
1053            "'show ip6 neighbors verbose' to display the entire table...",
1054            vec_len (ns));
1055       vec_free (ns);
1056     }
1057   else
1058     vlib_cli_output (vm, "No ip6 neighbors");
1059
1060   return error;
1061 }
1062
1063 /*?
1064  * This command is used to display the adjacent IPv6 hosts found via
1065  * neighbor discovery. Optionally, limit the output to the specified
1066  * interface.
1067  *
1068  * @cliexpar
1069  * Example of how to display the IPv6 neighbor adjacency table:
1070  * @cliexstart{show ip6 neighbors}
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  *     886.6654     ::1:1:c:0:9       S    02:fe:e4:45:27:5b                GigabitEthernet3/0/0
1075  * @cliexend
1076  * Example of how to display the IPv6 neighbor adjacency table for given interface:
1077  * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0}
1078  *     Time           Address       Flags     Link layer                     Interface
1079  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
1080  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
1081  * @cliexend
1082 ?*/
1083 /* *INDENT-OFF* */
1084 VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = {
1085   .path = "show ip6 neighbors",
1086   .function = show_ip6_neighbors,
1087   .short_help = "show ip6 neighbors [<interface>]",
1088 };
1089 /* *INDENT-ON* */
1090
1091 static clib_error_t *
1092 set_ip6_neighbor (vlib_main_t * vm,
1093                   unformat_input_t * input, vlib_cli_command_t * cmd)
1094 {
1095   ip_neighbor_flags_t flags = IP_NEIGHBOR_FLAG_NONE;
1096   vnet_main_t *vnm = vnet_get_main ();
1097   ip6_address_t addr;
1098   mac_address_t mac;
1099   int addr_valid = 0;
1100   int is_del = 0;
1101   u32 sw_if_index;
1102
1103   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1104     {
1105       /* intfc, ip6-address, mac-address */
1106       if (unformat (input, "%U %U %U",
1107                     unformat_vnet_sw_interface, vnm, &sw_if_index,
1108                     unformat_ip6_address, &addr,
1109                     unformat_mac_address_t, &mac))
1110         addr_valid = 1;
1111
1112       else if (unformat (input, "delete") || unformat (input, "del"))
1113         is_del = 1;
1114       else if (unformat (input, "static"))
1115         flags |= IP_NEIGHBOR_FLAG_STATIC;
1116       else if (unformat (input, "no-fib-entry"))
1117         flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
1118       else
1119         break;
1120     }
1121
1122   if (!addr_valid)
1123     return clib_error_return (0, "Missing interface, ip6 or hw address");
1124
1125   if (!is_del)
1126     vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr, &mac, flags);
1127   else
1128     vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr);
1129   return 0;
1130 }
1131
1132 /*?
1133  * This command is used to manually add an entry to the IPv6 neighbor
1134  * adjacency table. Optionally, the entry can be added as static. It is
1135  * also used to remove an entry from the table. Use the '<em>show ip6
1136  * neighbors</em>' command to display all learned and manually entered entries.
1137  *
1138  * @cliexpar
1139  * Example of how to add a static entry to the IPv6 neighbor adjacency table:
1140  * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static}
1141  * Example of how to delete an entry from the IPv6 neighbor adjacency table:
1142  * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b}
1143 ?*/
1144 /* *INDENT-OFF* */
1145 VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) =
1146 {
1147   .path = "set ip6 neighbor",
1148   .function = set_ip6_neighbor,
1149   .short_help = "set ip6 neighbor [del] <interface> <ip6-address> <mac-address> [static]",
1150 };
1151 /* *INDENT-ON* */
1152
1153 typedef enum
1154 {
1155   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
1156   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
1157   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
1158 } icmp6_neighbor_solicitation_or_advertisement_next_t;
1159
1160 static_always_inline uword
1161 icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm,
1162                                               vlib_node_runtime_t * node,
1163                                               vlib_frame_t * frame,
1164                                               uword is_solicitation)
1165 {
1166   vnet_main_t *vnm = vnet_get_main ();
1167   ip6_main_t *im = &ip6_main;
1168   uword n_packets = frame->n_vectors;
1169   u32 *from, *to_next;
1170   u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent;
1171   icmp6_neighbor_discovery_option_type_t option_type;
1172   vlib_node_runtime_t *error_node =
1173     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1174   int bogus_length;
1175
1176   from = vlib_frame_vector_args (frame);
1177   n_left_from = n_packets;
1178   next_index = node->cached_next_index;
1179
1180   if (node->flags & VLIB_NODE_FLAG_TRACE)
1181     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1182                                    /* stride */ 1,
1183                                    sizeof (icmp6_input_trace_t));
1184
1185   option_type =
1186     (is_solicitation
1187      ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address
1188      : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address);
1189   n_advertisements_sent = 0;
1190
1191   while (n_left_from > 0)
1192     {
1193       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1194
1195       while (n_left_from > 0 && n_left_to_next > 0)
1196         {
1197           vlib_buffer_t *p0;
1198           ip6_header_t *ip0;
1199           icmp6_neighbor_solicitation_or_advertisement_header_t *h0;
1200           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1201           u32 bi0, options_len0, sw_if_index0, next0, error0;
1202           u32 ip6_sadd_link_local, ip6_sadd_unspecified;
1203           int is_rewrite0;
1204           u32 ni0;
1205
1206           bi0 = to_next[0] = from[0];
1207
1208           from += 1;
1209           to_next += 1;
1210           n_left_from -= 1;
1211           n_left_to_next -= 1;
1212
1213           p0 = vlib_get_buffer (vm, bi0);
1214           ip0 = vlib_buffer_get_current (p0);
1215           h0 = ip6_next_header (ip0);
1216           options_len0 =
1217             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1218
1219           error0 = ICMP6_ERROR_NONE;
1220           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1221           ip6_sadd_link_local =
1222             ip6_address_is_link_local_unicast (&ip0->src_address);
1223           ip6_sadd_unspecified =
1224             ip6_address_is_unspecified (&ip0->src_address);
1225
1226           /* Check that source address is unspecified, link-local or else on-link. */
1227           if (!ip6_sadd_unspecified && !ip6_sadd_link_local)
1228             {
1229               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1230
1231               if (ADJ_INDEX_INVALID != src_adj_index0)
1232                 {
1233                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1234
1235                   /* Allow all realistic-looking rewrite adjacencies to pass */
1236                   ni0 = adj0->lookup_next_index;
1237                   is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) &&
1238                     (ni0 < IP6_LOOKUP_N_NEXT);
1239
1240                   error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0
1241                              || !is_rewrite0)
1242                             ?
1243                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK
1244                             : error0);
1245                 }
1246               else
1247                 {
1248                   error0 =
1249                     ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK;
1250                 }
1251             }
1252
1253           o0 = (void *) (h0 + 1);
1254           o0 = ((options_len0 == 8 && o0->header.type == option_type
1255                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1256
1257           /* If src address unspecified or link local, donot learn neighbor MAC */
1258           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1259                             !ip6_sadd_unspecified))
1260             {
1261               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1262                                               is_solicitation ?
1263                                               &ip0->src_address :
1264                                               &h0->target_address,
1265                                               (mac_address_t *)
1266                                               o0->ethernet_address,
1267                                               IP_NEIGHBOR_FLAG_NONE);
1268             }
1269
1270           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1271             {
1272               /* Check that target address is local to this router. */
1273               fib_node_index_t fei;
1274               u32 fib_index;
1275
1276               fib_index =
1277                 ip6_fib_table_get_index_for_sw_if_index (sw_if_index0);
1278
1279               if (~0 == fib_index)
1280                 {
1281                   error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1282                 }
1283               else
1284                 {
1285                   if (ip6_address_is_link_local_unicast (&h0->target_address))
1286                     {
1287                       fei = ip6_fib_table_lookup_exact_match
1288                         (ip6_ll_fib_get (sw_if_index0),
1289                          &h0->target_address, 128);
1290                     }
1291                   else
1292                     {
1293                       fei = ip6_fib_table_lookup_exact_match (fib_index,
1294                                                               &h0->target_address,
1295                                                               128);
1296                     }
1297
1298                   if (FIB_NODE_INDEX_INVALID == fei)
1299                     {
1300                       /* The target address is not in the FIB */
1301                       error0 =
1302                         ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1303                     }
1304                   else
1305                     {
1306                       if (FIB_ENTRY_FLAG_LOCAL &
1307                           fib_entry_get_flags_for_source (fei,
1308                                                           FIB_SOURCE_INTERFACE))
1309                         {
1310                           /* It's an address that belongs to one of our interfaces
1311                            * that's good. */
1312                         }
1313                       else
1314                         if (fib_entry_is_sourced
1315                             (fei, FIB_SOURCE_IP6_ND_PROXY) ||
1316                             fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND))
1317                         {
1318                           /* The address was added by IPv6 Proxy ND config.
1319                            * We should only respond to these if the NS arrived on
1320                            * the link that has a matching covering prefix */
1321                         }
1322                       else
1323                         {
1324                           error0 =
1325                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1326                         }
1327                     }
1328                 }
1329             }
1330
1331           if (is_solicitation)
1332             next0 = (error0 != ICMP6_ERROR_NONE
1333                      ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP
1334                      : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY);
1335           else
1336             {
1337               next0 = 0;
1338               error0 = error0 == ICMP6_ERROR_NONE ?
1339                 ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0;
1340             }
1341
1342           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1343             {
1344               vnet_sw_interface_t *sw_if0;
1345               ethernet_interface_t *eth_if0;
1346               ethernet_header_t *eth0;
1347
1348               /* dst address is either source address or the all-nodes mcast addr */
1349               if (!ip6_sadd_unspecified)
1350                 ip0->dst_address = ip0->src_address;
1351               else
1352                 ip6_set_reserved_multicast_address (&ip0->dst_address,
1353                                                     IP6_MULTICAST_SCOPE_link_local,
1354                                                     IP6_MULTICAST_GROUP_ID_all_hosts);
1355
1356               ip0->src_address = h0->target_address;
1357               ip0->hop_limit = 255;
1358               h0->icmp.type = ICMP6_neighbor_advertisement;
1359
1360               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1361               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1362               eth_if0 =
1363                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1364               if (eth_if0 && o0)
1365                 {
1366                   clib_memcpy (o0->ethernet_address, eth_if0->address, 6);
1367                   o0->header.type =
1368                     ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
1369                 }
1370
1371               h0->advertisement_flags = clib_host_to_net_u32
1372                 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
1373                  | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
1374
1375               h0->icmp.checksum = 0;
1376               h0->icmp.checksum =
1377                 ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1378                                                    &bogus_length);
1379               ASSERT (bogus_length == 0);
1380
1381               /* Reuse current MAC header, copy SMAC to DMAC and
1382                * interface MAC to SMAC */
1383               vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0));
1384               eth0 = vlib_buffer_get_current (p0);
1385               clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1386               if (eth_if0)
1387                 clib_memcpy (eth0->src_address, eth_if0->address, 6);
1388
1389               /* Setup input and output sw_if_index for packet */
1390               ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0);
1391               vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1392               vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1393                 vnet_main.local_interface_sw_if_index;
1394
1395               n_advertisements_sent++;
1396             }
1397
1398           p0->error = error_node->errors[error0];
1399
1400           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1401                                            to_next, n_left_to_next,
1402                                            bi0, next0);
1403         }
1404
1405       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1406     }
1407
1408   /* Account for advertisements sent. */
1409   vlib_error_count (vm, error_node->node_index,
1410                     ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX,
1411                     n_advertisements_sent);
1412
1413   return frame->n_vectors;
1414 }
1415
1416 /* for "syslogging" - use elog for now */
1417 #define foreach_log_level            \
1418   _ (DEBUG, "DEBUG")                         \
1419   _ (INFO, "INFORMATION")            \
1420   _ (NOTICE, "NOTICE")               \
1421   _ (WARNING, "WARNING")             \
1422   _ (ERR, "ERROR")                                    \
1423   _ (CRIT, "CRITICAL")                        \
1424   _ (ALERT, "ALERT")                          \
1425   _ (EMERG,  "EMERGENCY")
1426
1427 typedef enum
1428 {
1429 #define _(f,s) LOG_##f,
1430   foreach_log_level
1431 #undef _
1432 } log_level_t;
1433
1434 static char *log_level_strings[] = {
1435 #define _(f,s) s,
1436   foreach_log_level
1437 #undef _
1438 };
1439
1440 static int logmask = 1 << LOG_DEBUG;
1441
1442 static void
1443 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
1444 {
1445   /* just use elog for now */
1446   u8 *what;
1447   va_list va;
1448
1449   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
1450     return;
1451
1452   va_start (va, fmt);
1453   if (fmt)
1454     {
1455       what = va_format (0, fmt, &va);
1456
1457       ELOG_TYPE_DECLARE (e) =
1458       {
1459       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
1460       struct
1461       {
1462         u32 s[2];
1463       } *ed;
1464       ed = ELOG_DATA (&vm->elog_main, e);
1465       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
1466       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
1467     }
1468   va_end (va);
1469   return;
1470 }
1471
1472 clib_error_t *
1473 call_ip6_neighbor_callbacks (void *data,
1474                              _vnet_ip6_neighbor_function_list_elt_t * elt)
1475 {
1476   clib_error_t *error = 0;
1477
1478   while (elt)
1479     {
1480       error = elt->fp (data);
1481       if (error)
1482         return error;
1483       elt = elt->next_ip6_neighbor_function;
1484     }
1485
1486   return error;
1487 }
1488
1489 /* ipv6 neighbor discovery - router advertisements */
1490 typedef enum
1491 {
1492   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
1493   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
1494   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
1495   ICMP6_ROUTER_SOLICITATION_N_NEXT,
1496 } icmp6_router_solicitation_or_advertisement_next_t;
1497
1498 static_always_inline uword
1499 icmp6_router_solicitation (vlib_main_t * vm,
1500                            vlib_node_runtime_t * node, vlib_frame_t * frame)
1501 {
1502   vnet_main_t *vnm = vnet_get_main ();
1503   ip6_main_t *im = &ip6_main;
1504   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1505   uword n_packets = frame->n_vectors;
1506   u32 *from, *to_next;
1507   u32 n_left_from, n_left_to_next, next_index;
1508   u32 n_advertisements_sent = 0;
1509   int bogus_length;
1510
1511   icmp6_neighbor_discovery_option_type_t option_type;
1512
1513   vlib_node_runtime_t *error_node =
1514     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1515
1516   from = vlib_frame_vector_args (frame);
1517   n_left_from = n_packets;
1518   next_index = node->cached_next_index;
1519
1520   if (node->flags & VLIB_NODE_FLAG_TRACE)
1521     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1522                                    /* stride */ 1,
1523                                    sizeof (icmp6_input_trace_t));
1524
1525   /* source may append his LL address */
1526   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1527
1528   while (n_left_from > 0)
1529     {
1530       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1531
1532       while (n_left_from > 0 && n_left_to_next > 0)
1533         {
1534           vlib_buffer_t *p0;
1535           ip6_header_t *ip0;
1536           ip6_radv_t *radv_info = 0;
1537
1538           icmp6_neighbor_discovery_header_t *h0;
1539           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1540
1541           u32 bi0, options_len0, sw_if_index0, next0, error0;
1542           u32 is_solicitation = 1, is_dropped = 0;
1543           u32 is_unspecified, is_link_local;
1544
1545           bi0 = to_next[0] = from[0];
1546
1547           from += 1;
1548           to_next += 1;
1549           n_left_from -= 1;
1550           n_left_to_next -= 1;
1551
1552           p0 = vlib_get_buffer (vm, bi0);
1553           ip0 = vlib_buffer_get_current (p0);
1554           h0 = ip6_next_header (ip0);
1555           options_len0 =
1556             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1557           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
1558           is_link_local =
1559             ip6_address_is_link_local_unicast (&ip0->src_address);
1560
1561           error0 = ICMP6_ERROR_NONE;
1562           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1563
1564           /* check if solicitation  (not from nd_timer node) */
1565           if (ip6_address_is_unspecified (&ip0->dst_address))
1566             is_solicitation = 0;
1567
1568           /* Check that source address is unspecified, link-local or else on-link. */
1569           if (!is_unspecified && !is_link_local)
1570             {
1571               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1572
1573               if (ADJ_INDEX_INVALID != src_adj_index0)
1574                 {
1575                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1576
1577                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
1578                             ?
1579                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
1580                             : error0);
1581                 }
1582               else
1583                 {
1584                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
1585                 }
1586             }
1587
1588           /* check for source LL option and process */
1589           o0 = (void *) (h0 + 1);
1590           o0 = ((options_len0 == 8
1591                  && o0->header.type == option_type
1592                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1593
1594           /* if src address unspecified IGNORE any options */
1595           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1596                             !is_unspecified && !is_link_local))
1597             {
1598               vnet_set_ip6_ethernet_neighbor
1599                 (vm, sw_if_index0,
1600                  &ip0->src_address,
1601                  (mac_address_t *) o0->ethernet_address,
1602                  IP_NEIGHBOR_FLAG_NONE);
1603             }
1604
1605           /* default is to drop */
1606           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1607
1608           if (error0 == ICMP6_ERROR_NONE)
1609             {
1610               vnet_sw_interface_t *sw_if0;
1611               ethernet_interface_t *eth_if0;
1612               u32 adj_index0;
1613
1614               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1615               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1616               eth_if0 =
1617                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1618
1619               /* only support ethernet interface type for now */
1620               error0 =
1621                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1622                 : error0;
1623
1624               if (error0 == ICMP6_ERROR_NONE)
1625                 {
1626                   u32 ri;
1627
1628                   /* adjust the sizeof the buffer to just include the ipv6 header */
1629                   p0->current_length -=
1630                     (options_len0 +
1631                      sizeof (icmp6_neighbor_discovery_header_t));
1632
1633                   /* look up the radv_t information for this interface */
1634                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1635                       sw_if_index0)
1636                     {
1637                       ri =
1638                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1639
1640                       if (ri != ~0)
1641                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1642                     }
1643
1644                   error0 =
1645                     ((!radv_info) ?
1646                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1647                      error0);
1648
1649                   if (error0 == ICMP6_ERROR_NONE)
1650                     {
1651                       f64 now = vlib_time_now (vm);
1652
1653                       /* for solicited adverts - need to rate limit */
1654                       if (is_solicitation)
1655                         {
1656                           if (0 != radv_info->last_radv_time &&
1657                               (now - radv_info->last_radv_time) <
1658                               MIN_DELAY_BETWEEN_RAS)
1659                             is_dropped = 1;
1660                           else
1661                             radv_info->last_radv_time = now;
1662                         }
1663
1664                       /* send now  */
1665                       icmp6_router_advertisement_header_t rh;
1666
1667                       rh.icmp.type = ICMP6_router_advertisement;
1668                       rh.icmp.code = 0;
1669                       rh.icmp.checksum = 0;
1670
1671                       rh.current_hop_limit = radv_info->curr_hop_limit;
1672                       rh.router_lifetime_in_sec =
1673                         clib_host_to_net_u16
1674                         (radv_info->adv_router_lifetime_in_sec);
1675                       rh.
1676                         time_in_msec_between_retransmitted_neighbor_solicitations
1677                         =
1678                         clib_host_to_net_u32 (radv_info->
1679                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
1680                       rh.neighbor_reachable_time_in_msec =
1681                         clib_host_to_net_u32 (radv_info->
1682                                               adv_neighbor_reachable_time_in_msec);
1683
1684                       rh.flags =
1685                         (radv_info->adv_managed_flag) ?
1686                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
1687                         0;
1688                       rh.flags |=
1689                         ((radv_info->adv_other_flag) ?
1690                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
1691                          0);
1692
1693
1694                       u16 payload_length =
1695                         sizeof (icmp6_router_advertisement_header_t);
1696
1697                       if (vlib_buffer_add_data
1698                           (vm, &bi0, (void *) &rh,
1699                            sizeof (icmp6_router_advertisement_header_t)))
1700                         {
1701                           /* buffer allocation failed, drop the pkt */
1702                           error0 = ICMP6_ERROR_ALLOC_FAILURE;
1703                           goto drop0;
1704                         }
1705
1706                       if (radv_info->adv_link_layer_address)
1707                         {
1708                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1709                             h;
1710
1711                           h.header.type =
1712                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1713                           h.header.n_data_u64s = 1;
1714
1715                           /* copy ll address */
1716                           clib_memcpy (&h.ethernet_address[0],
1717                                        eth_if0->address, 6);
1718
1719                           if (vlib_buffer_add_data
1720                               (vm, &bi0, (void *) &h,
1721                                sizeof
1722                                (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
1723                             {
1724                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1725                               goto drop0;
1726                             }
1727
1728                           payload_length +=
1729                             sizeof
1730                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1731                         }
1732
1733                       /* add MTU option */
1734                       if (radv_info->adv_link_mtu)
1735                         {
1736                           icmp6_neighbor_discovery_mtu_option_t h;
1737
1738                           h.unused = 0;
1739                           h.mtu =
1740                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1741                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1742                           h.header.n_data_u64s = 1;
1743
1744                           payload_length +=
1745                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1746
1747                           if (vlib_buffer_add_data
1748                               (vm, &bi0, (void *) &h,
1749                                sizeof
1750                                (icmp6_neighbor_discovery_mtu_option_t)))
1751                             {
1752                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
1753                               goto drop0;
1754                             }
1755                         }
1756
1757                       /* add advertised prefix options  */
1758                       ip6_radv_prefix_t *pr_info;
1759
1760                       /* *INDENT-OFF* */
1761                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1762                       ({
1763                         if(pr_info->enabled &&
1764                            (!pr_info->decrement_lifetime_flag
1765                             || (pr_info->pref_lifetime_expires >0)))
1766                           {
1767                             /* advertise this prefix */
1768                             icmp6_neighbor_discovery_prefix_information_option_t h;
1769
1770                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1771                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1772
1773                             h.dst_address_length  = pr_info->prefix_len;
1774
1775                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1776                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1777
1778                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1779                               {
1780                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1781                                 h.preferred_time  = 0;
1782                               }
1783                             else
1784                               {
1785                                 if(pr_info->decrement_lifetime_flag)
1786                                   {
1787                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1788                                       (pr_info->valid_lifetime_expires  - now) : 0;
1789
1790                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1791                                       (pr_info->pref_lifetime_expires  - now) : 0;
1792                                   }
1793
1794                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1795                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1796                               }
1797                             h.unused  = 0;
1798
1799                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1800
1801                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1802
1803                             if (vlib_buffer_add_data
1804                                 (vm, &bi0, (void *)&h,
1805                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
1806                               {
1807                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
1808                                 goto drop0;
1809                               }
1810
1811                           }
1812                       }));
1813                       /* *INDENT-ON* */
1814
1815                       /* add additional options before here */
1816
1817                       /* finish building the router advertisement... */
1818                       if (!is_unspecified && radv_info->send_unicast)
1819                         {
1820                           ip0->dst_address = ip0->src_address;
1821                         }
1822                       else
1823                         {
1824                           /* target address is all-nodes mcast addr */
1825                           ip6_set_reserved_multicast_address
1826                             (&ip0->dst_address,
1827                              IP6_MULTICAST_SCOPE_link_local,
1828                              IP6_MULTICAST_GROUP_ID_all_hosts);
1829                         }
1830
1831                       /* source address MUST be the link-local address */
1832                       ip0->src_address = radv_info->link_local_address;
1833
1834                       ip0->hop_limit = 255;
1835                       ip0->payload_length =
1836                         clib_host_to_net_u16 (payload_length);
1837
1838                       icmp6_router_advertisement_header_t *rh0 =
1839                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1840                       rh0->icmp.checksum =
1841                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1842                                                            &bogus_length);
1843                       ASSERT (bogus_length == 0);
1844
1845                       /* setup output if and adjacency */
1846                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1847                         vnet_main.local_interface_sw_if_index;
1848
1849                       if (is_solicitation)
1850                         {
1851                           ethernet_header_t *eth0;
1852                           /* Reuse current MAC header, copy SMAC to DMAC and
1853                            * interface MAC to SMAC */
1854                           vlib_buffer_reset (p0);
1855                           eth0 = vlib_buffer_get_current (p0);
1856                           clib_memcpy (eth0->dst_address, eth0->src_address,
1857                                        6);
1858                           clib_memcpy (eth0->src_address, eth_if0->address,
1859                                        6);
1860                           next0 =
1861                             is_dropped ? next0 :
1862                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1863                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1864                             sw_if_index0;
1865                         }
1866                       else
1867                         {
1868                           adj_index0 = radv_info->mcast_adj_index;
1869                           if (adj_index0 == 0)
1870                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1871                           else
1872                             {
1873                               next0 =
1874                                 is_dropped ? next0 :
1875                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1876                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1877                                 adj_index0;
1878                             }
1879                         }
1880                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1881
1882                       radv_info->n_solicitations_dropped += is_dropped;
1883                       radv_info->n_solicitations_rcvd += is_solicitation;
1884
1885                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1886                         {
1887                           radv_info->n_advertisements_sent++;
1888                           n_advertisements_sent++;
1889                         }
1890                     }
1891                 }
1892             }
1893
1894         drop0:
1895           p0->error = error_node->errors[error0];
1896
1897           if (error0 != ICMP6_ERROR_NONE)
1898             vlib_error_count (vm, error_node->node_index, error0, 1);
1899
1900           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1901                                            to_next, n_left_to_next,
1902                                            bi0, next0);
1903
1904         }
1905
1906       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1907     }
1908
1909   /* Account for router advertisements sent. */
1910   vlib_error_count (vm, error_node->node_index,
1911                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1912                     n_advertisements_sent);
1913
1914   return frame->n_vectors;
1915 }
1916
1917  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1918 static_always_inline uword
1919 icmp6_router_advertisement (vlib_main_t * vm,
1920                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1921 {
1922   vnet_main_t *vnm = vnet_get_main ();
1923   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1924   uword n_packets = frame->n_vectors;
1925   u32 *from, *to_next;
1926   u32 n_left_from, n_left_to_next, next_index;
1927   u32 n_advertisements_rcvd = 0;
1928
1929   vlib_node_runtime_t *error_node =
1930     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1931
1932   from = vlib_frame_vector_args (frame);
1933   n_left_from = n_packets;
1934   next_index = node->cached_next_index;
1935
1936   if (node->flags & VLIB_NODE_FLAG_TRACE)
1937     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1938                                    /* stride */ 1,
1939                                    sizeof (icmp6_input_trace_t));
1940
1941   while (n_left_from > 0)
1942     {
1943       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1944
1945       while (n_left_from > 0 && n_left_to_next > 0)
1946         {
1947           vlib_buffer_t *p0;
1948           ip6_header_t *ip0;
1949           ip6_radv_t *radv_info = 0;
1950           icmp6_router_advertisement_header_t *h0;
1951           u32 bi0, options_len0, sw_if_index0, next0, error0;
1952
1953           bi0 = to_next[0] = from[0];
1954
1955           from += 1;
1956           to_next += 1;
1957           n_left_from -= 1;
1958           n_left_to_next -= 1;
1959
1960           p0 = vlib_get_buffer (vm, bi0);
1961           ip0 = vlib_buffer_get_current (p0);
1962           h0 = ip6_next_header (ip0);
1963           options_len0 =
1964             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1965
1966           error0 = ICMP6_ERROR_NONE;
1967           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1968
1969           /* Check that source address is link-local */
1970           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1971             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1972
1973           /* default is to drop */
1974           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1975
1976           n_advertisements_rcvd++;
1977
1978           if (error0 == ICMP6_ERROR_NONE)
1979             {
1980               vnet_sw_interface_t *sw_if0;
1981               ethernet_interface_t *eth_if0;
1982
1983               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1984               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1985               eth_if0 =
1986                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1987
1988               /* only support ethernet interface type for now */
1989               error0 =
1990                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1991                 : error0;
1992
1993               if (error0 == ICMP6_ERROR_NONE)
1994                 {
1995                   u32 ri;
1996
1997                   /* look up the radv_t information for this interface */
1998                   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) >
1999                       sw_if_index0)
2000                     {
2001                       ri =
2002                         nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
2003
2004                       if (ri != ~0)
2005                         radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2006                     }
2007
2008                   error0 =
2009                     ((!radv_info) ?
2010                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
2011                      error0);
2012
2013                   if (error0 == ICMP6_ERROR_NONE)
2014                     {
2015                       radv_info->keep_sending_rs = 0;
2016
2017                       ra_report_t r;
2018
2019                       r.sw_if_index = sw_if_index0;
2020                       memcpy (&r.router_address, &ip0->src_address, 16);
2021                       r.current_hop_limit = h0->current_hop_limit;
2022                       r.flags = h0->flags;
2023                       r.router_lifetime_in_sec =
2024                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
2025                       r.neighbor_reachable_time_in_msec =
2026                         clib_net_to_host_u32
2027                         (h0->neighbor_reachable_time_in_msec);
2028                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
2029                       r.prefixes = 0;
2030
2031                       /* validate advertised information */
2032                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
2033                           && (h0->current_hop_limit !=
2034                               radv_info->curr_hop_limit))
2035                         {
2036                           ip6_neighbor_syslog (vm, LOG_WARNING,
2037                                                "our AdvCurHopLimit on %U doesn't agree with %U",
2038                                                format_vnet_sw_if_index_name,
2039                                                vnm, sw_if_index0,
2040                                                format_ip6_address,
2041                                                &ip0->src_address);
2042                         }
2043
2044                       if ((h0->flags &
2045                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
2046                           != radv_info->adv_managed_flag)
2047                         {
2048                           ip6_neighbor_syslog (vm, LOG_WARNING,
2049                                                "our AdvManagedFlag on %U doesn't agree with %U",
2050                                                format_vnet_sw_if_index_name,
2051                                                vnm, sw_if_index0,
2052                                                format_ip6_address,
2053                                                &ip0->src_address);
2054                         }
2055
2056                       if ((h0->flags &
2057                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
2058                           != radv_info->adv_other_flag)
2059                         {
2060                           ip6_neighbor_syslog (vm, LOG_WARNING,
2061                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
2062                                                format_vnet_sw_if_index_name,
2063                                                vnm, sw_if_index0,
2064                                                format_ip6_address,
2065                                                &ip0->src_address);
2066                         }
2067
2068                       if ((h0->
2069                            time_in_msec_between_retransmitted_neighbor_solicitations
2070                            && radv_info->
2071                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
2072                           && (h0->
2073                               time_in_msec_between_retransmitted_neighbor_solicitations
2074                               !=
2075                               clib_host_to_net_u32 (radv_info->
2076                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
2077                         {
2078                           ip6_neighbor_syslog (vm, LOG_WARNING,
2079                                                "our AdvRetransTimer on %U doesn't agree with %U",
2080                                                format_vnet_sw_if_index_name,
2081                                                vnm, sw_if_index0,
2082                                                format_ip6_address,
2083                                                &ip0->src_address);
2084                         }
2085
2086                       if ((h0->neighbor_reachable_time_in_msec &&
2087                            radv_info->adv_neighbor_reachable_time_in_msec) &&
2088                           (h0->neighbor_reachable_time_in_msec !=
2089                            clib_host_to_net_u32
2090                            (radv_info->adv_neighbor_reachable_time_in_msec)))
2091                         {
2092                           ip6_neighbor_syslog (vm, LOG_WARNING,
2093                                                "our AdvReachableTime on %U doesn't agree with %U",
2094                                                format_vnet_sw_if_index_name,
2095                                                vnm, sw_if_index0,
2096                                                format_ip6_address,
2097                                                &ip0->src_address);
2098                         }
2099
2100                       /* check for MTU or prefix options or .. */
2101                       u8 *opt_hdr = (u8 *) (h0 + 1);
2102                       while (options_len0 > 0)
2103                         {
2104                           icmp6_neighbor_discovery_option_header_t *o0 =
2105                             (icmp6_neighbor_discovery_option_header_t *)
2106                             opt_hdr;
2107                           int opt_len = o0->n_data_u64s << 3;
2108                           icmp6_neighbor_discovery_option_type_t option_type =
2109                             o0->type;
2110
2111                           if (options_len0 < 2)
2112                             {
2113                               ip6_neighbor_syslog (vm, LOG_ERR,
2114                                                    "malformed RA packet on %U from %U",
2115                                                    format_vnet_sw_if_index_name,
2116                                                    vnm, sw_if_index0,
2117                                                    format_ip6_address,
2118                                                    &ip0->src_address);
2119                               break;
2120                             }
2121
2122                           if (opt_len == 0)
2123                             {
2124                               ip6_neighbor_syslog (vm, LOG_ERR,
2125                                                    " zero length option in RA on %U from %U",
2126                                                    format_vnet_sw_if_index_name,
2127                                                    vnm, sw_if_index0,
2128                                                    format_ip6_address,
2129                                                    &ip0->src_address);
2130                               break;
2131                             }
2132                           else if (opt_len > options_len0)
2133                             {
2134                               ip6_neighbor_syslog (vm, LOG_ERR,
2135                                                    "option length in RA packet  greater than total length on %U from %U",
2136                                                    format_vnet_sw_if_index_name,
2137                                                    vnm, sw_if_index0,
2138                                                    format_ip6_address,
2139                                                    &ip0->src_address);
2140                               break;
2141                             }
2142
2143                           options_len0 -= opt_len;
2144                           opt_hdr += opt_len;
2145
2146                           switch (option_type)
2147                             {
2148                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
2149                               {
2150                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2151                                   * h =
2152                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
2153                                    *) (o0);
2154
2155                                 if (opt_len < sizeof (*h))
2156                                   break;
2157
2158                                 memcpy (r.slla, h->ethernet_address, 6);
2159                               }
2160                               break;
2161
2162                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
2163                               {
2164                                 icmp6_neighbor_discovery_mtu_option_t *h =
2165                                   (icmp6_neighbor_discovery_mtu_option_t
2166                                    *) (o0);
2167
2168                                 if (opt_len < sizeof (*h))
2169                                   break;
2170
2171                                 r.mtu = clib_net_to_host_u32 (h->mtu);
2172
2173                                 if ((h->mtu && radv_info->adv_link_mtu) &&
2174                                     (h->mtu !=
2175                                      clib_host_to_net_u32
2176                                      (radv_info->adv_link_mtu)))
2177                                   {
2178                                     ip6_neighbor_syslog (vm, LOG_WARNING,
2179                                                          "our AdvLinkMTU on %U doesn't agree with %U",
2180                                                          format_vnet_sw_if_index_name,
2181                                                          vnm, sw_if_index0,
2182                                                          format_ip6_address,
2183                                                          &ip0->src_address);
2184                                   }
2185                               }
2186                               break;
2187
2188                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
2189                               {
2190                                 icmp6_neighbor_discovery_prefix_information_option_t
2191                                   * h =
2192                                   (icmp6_neighbor_discovery_prefix_information_option_t
2193                                    *) (o0);
2194
2195                                 /* validate advertised prefix options  */
2196                                 ip6_radv_prefix_t *pr_info;
2197                                 u32 preferred, valid;
2198
2199                                 if (opt_len < sizeof (*h))
2200                                   break;
2201
2202                                 vec_validate (r.prefixes,
2203                                               vec_len (r.prefixes));
2204                                 ra_report_prefix_info_t *prefix =
2205                                   vec_elt_at_index (r.prefixes,
2206                                                     vec_len (r.prefixes) - 1);
2207
2208                                 preferred =
2209                                   clib_net_to_host_u32 (h->preferred_time);
2210                                 valid = clib_net_to_host_u32 (h->valid_time);
2211
2212                                 prefix->preferred_time = preferred;
2213                                 prefix->valid_time = valid;
2214                                 prefix->flags = h->flags & 0xc0;
2215                                 prefix->prefix.fp_len = h->dst_address_length;
2216                                 prefix->prefix.fp_addr.ip6 = h->dst_address;
2217                                 prefix->prefix.fp_proto = FIB_PROTOCOL_IP6;
2218
2219                                 /* look for matching prefix - if we our advertising it, it better be consistant */
2220                                 /* *INDENT-OFF* */
2221                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
2222                                 ({
2223
2224                                   ip6_address_t mask;
2225                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
2226
2227                                   if(pr_info->enabled &&
2228                                      (pr_info->prefix_len == h->dst_address_length) &&
2229                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
2230                                     {
2231                                       /* found it */
2232                                       if(!pr_info->decrement_lifetime_flag &&
2233                                          valid != pr_info->adv_valid_lifetime_in_secs)
2234                                         {
2235                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2236                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
2237                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2238                                                               format_ip6_address, &h->dst_address);
2239                                         }
2240                                       if(!pr_info->decrement_lifetime_flag &&
2241                                          preferred != pr_info->adv_pref_lifetime_in_secs)
2242                                         {
2243                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
2244                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
2245                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
2246                                                               format_ip6_address, &h->dst_address);
2247                                         }
2248                                     }
2249                                   break;
2250                                 }));
2251                                 /* *INDENT-ON* */
2252                                 break;
2253                               }
2254                             default:
2255                               /* skip this one */
2256                               break;
2257                             }
2258                         }
2259                       ra_publish (&r);
2260                     }
2261                 }
2262             }
2263
2264           p0->error = error_node->errors[error0];
2265
2266           if (error0 != ICMP6_ERROR_NONE)
2267             vlib_error_count (vm, error_node->node_index, error0, 1);
2268
2269           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2270                                            to_next, n_left_to_next,
2271                                            bi0, next0);
2272         }
2273
2274       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2275     }
2276
2277   /* Account for router advertisements received. */
2278   vlib_error_count (vm, error_node->node_index,
2279                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2280                     n_advertisements_rcvd);
2281
2282   return frame->n_vectors;
2283 }
2284
2285 static inline f64
2286 random_f64_from_to (f64 from, f64 to)
2287 {
2288   static u32 seed = 0;
2289   static u8 seed_set = 0;
2290   if (!seed_set)
2291     {
2292       seed = random_default_seed ();
2293       seed_set = 1;
2294     }
2295   return random_f64 (&seed) * (to - from) + from;
2296 }
2297
2298 static inline u8
2299 get_mac_address (u32 sw_if_index, u8 * address)
2300 {
2301   vnet_main_t *vnm = vnet_get_main ();
2302   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
2303   if (!hw_if->hw_address)
2304     return 1;
2305   clib_memcpy (address, hw_if->hw_address, 6);
2306   return 0;
2307 }
2308
2309 static inline vlib_buffer_t *
2310 create_buffer_for_rs (vlib_main_t * vm, ip6_radv_t * radv_info)
2311 {
2312   u32 bi0;
2313   vlib_buffer_t *p0;
2314   icmp6_router_solicitation_header_t *rh;
2315   u16 payload_length;
2316   int bogus_length;
2317   u32 sw_if_index;
2318
2319   sw_if_index = radv_info->sw_if_index;
2320
2321   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
2322     {
2323       clib_warning ("buffer allocation failure");
2324       return 0;
2325     }
2326
2327   p0 = vlib_get_buffer (vm, bi0);
2328   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
2329   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2330
2331   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
2332   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
2333
2334   vnet_buffer (p0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2335
2336   rh = vlib_buffer_get_current (p0);
2337   p0->current_length = sizeof (*rh);
2338
2339   rh->neighbor.icmp.type = ICMP6_router_solicitation;
2340   rh->neighbor.icmp.code = 0;
2341   rh->neighbor.icmp.checksum = 0;
2342   rh->neighbor.reserved_must_be_zero = 0;
2343
2344   rh->link_layer_option.header.type =
2345     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2346   if (0 != get_mac_address (sw_if_index,
2347                             rh->link_layer_option.ethernet_address))
2348     {
2349       clib_warning ("interface with sw_if_index %u has no mac address",
2350                     sw_if_index);
2351       vlib_buffer_free (vm, &bi0, 1);
2352       return 0;
2353     }
2354   rh->link_layer_option.header.n_data_u64s = 1;
2355
2356   payload_length = sizeof (rh->neighbor) + sizeof (u64);
2357
2358   rh->ip.ip_version_traffic_class_and_flow_label =
2359     clib_host_to_net_u32 (0x6 << 28);
2360   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
2361   rh->ip.protocol = IP_PROTOCOL_ICMP6;
2362   rh->ip.hop_limit = 255;
2363   rh->ip.src_address = radv_info->link_local_address;
2364   /* set address ff02::2 */
2365   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
2366   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
2367
2368   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
2369                                                                   &rh->ip,
2370                                                                   &bogus_length);
2371
2372   return p0;
2373 }
2374
2375 static inline void
2376 stop_sending_rs (vlib_main_t * vm, ip6_radv_t * ra)
2377 {
2378   u32 bi0;
2379
2380   ra->keep_sending_rs = 0;
2381   if (ra->buffer)
2382     {
2383       bi0 = vlib_get_buffer_index (vm, ra->buffer);
2384       vlib_buffer_free (vm, &bi0, 1);
2385       ra->buffer = 0;
2386     }
2387 }
2388
2389 static inline bool
2390 check_send_rs (vlib_main_t * vm, ip6_radv_t * radv_info, f64 current_time,
2391                f64 * due_time)
2392 {
2393   vlib_buffer_t *p0;
2394   vlib_frame_t *f;
2395   u32 *to_next;
2396   u32 next_index;
2397   vlib_buffer_t *c0;
2398   u32 ci0;
2399
2400   icmp6_send_router_solicitation_params_t *params;
2401
2402   if (!radv_info->keep_sending_rs)
2403     return false;
2404
2405   params = &radv_info->params;
2406
2407   if (radv_info->due_time > current_time)
2408     {
2409       *due_time = radv_info->due_time;
2410       return true;
2411     }
2412
2413   p0 = radv_info->buffer;
2414
2415   next_index = ip6_rewrite_mcast_node.index;
2416
2417   c0 = vlib_buffer_copy (vm, p0);
2418   ci0 = vlib_get_buffer_index (vm, c0);
2419
2420   f = vlib_get_frame_to_node (vm, next_index);
2421   to_next = vlib_frame_vector_args (f);
2422   to_next[0] = ci0;
2423   f->n_vectors = 1;
2424   vlib_put_frame_to_node (vm, next_index, f);
2425
2426   if (params->mrc != 0 && --radv_info->n_left == 0)
2427     stop_sending_rs (vm, radv_info);
2428   else
2429     {
2430       radv_info->sleep_interval =
2431         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
2432       if (radv_info->sleep_interval > params->mrt)
2433         radv_info->sleep_interval =
2434           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
2435
2436       radv_info->due_time = current_time + radv_info->sleep_interval;
2437
2438       if (params->mrd != 0
2439           && current_time > radv_info->start_time + params->mrd)
2440         stop_sending_rs (vm, radv_info);
2441       else
2442         *due_time = radv_info->due_time;
2443     }
2444
2445   return radv_info->keep_sending_rs;
2446 }
2447
2448 static uword
2449 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
2450                  vlib_frame_t * f0)
2451 {
2452   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2453   ip6_radv_t *radv_info;
2454   uword *event_data = 0;
2455   f64 sleep_time = 1e9;
2456   f64 current_time;
2457   f64 due_time;
2458   f64 dt = 0;
2459
2460   while (true)
2461     {
2462       vlib_process_wait_for_event_or_clock (vm, sleep_time);
2463       vlib_process_get_events (vm, &event_data);
2464       vec_reset_length (event_data);
2465
2466       current_time = vlib_time_now (vm);
2467       do
2468         {
2469           due_time = current_time + 1e9;
2470         /* *INDENT-OFF* */
2471         pool_foreach (radv_info, nm->if_radv_pool,
2472         ({
2473             if (check_send_rs (vm, radv_info, current_time, &dt)
2474                 && (dt < due_time))
2475               due_time = dt;
2476         }));
2477         /* *INDENT-ON* */
2478           current_time = vlib_time_now (vm);
2479         }
2480       while (due_time < current_time);
2481
2482       sleep_time = due_time - current_time;
2483     }
2484
2485   return 0;
2486 }
2487
2488 /* *INDENT-OFF* */
2489 VLIB_REGISTER_NODE (send_rs_process_node) = {
2490     .function = send_rs_process,
2491     .type = VLIB_NODE_TYPE_PROCESS,
2492     .name = "send-rs-process",
2493 };
2494 /* *INDENT-ON* */
2495
2496 void
2497 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
2498                                 icmp6_send_router_solicitation_params_t *
2499                                 params)
2500 {
2501   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2502   u32 rai;
2503   ip6_radv_t *ra = 0;
2504
2505   ASSERT (~0 != sw_if_index);
2506
2507   rai = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2508   ra = pool_elt_at_index (nm->if_radv_pool, rai);
2509
2510   stop_sending_rs (vm, ra);
2511
2512   if (!stop)
2513     {
2514       ra->keep_sending_rs = 1;
2515       ra->params = *params;
2516       ra->n_left = params->mrc;
2517       ra->start_time = vlib_time_now (vm);
2518       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
2519       ra->due_time = 0;         /* send first packet ASAP */
2520       ra->buffer = create_buffer_for_rs (vm, ra);
2521       if (!ra->buffer)
2522         ra->keep_sending_rs = 0;
2523       else
2524         vlib_process_signal_event (vm, send_rs_process_node.index, 1, 0);
2525     }
2526 }
2527
2528 /**
2529  * @brief Add a multicast Address to the advertised MLD set
2530  */
2531 static void
2532 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2533 {
2534   ip6_mldp_group_t *mcast_group_info;
2535   uword *p;
2536
2537   /* lookup  mldp info for this interface */
2538   p = mhash_get (&radv_info->address_to_mldp_index, addr);
2539   mcast_group_info =
2540     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2541
2542   /* add address */
2543   if (!mcast_group_info)
2544     {
2545       /* add */
2546       u32 mi;
2547       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2548
2549       mi = mcast_group_info - radv_info->mldp_group_pool;
2550       mhash_set (&radv_info->address_to_mldp_index, addr, mi,   /* old_value */
2551                  0);
2552
2553       mcast_group_info->type = 4;
2554       mcast_group_info->mcast_source_address_pool = 0;
2555       mcast_group_info->num_sources = 0;
2556       clib_memcpy (&mcast_group_info->mcast_address, addr,
2557                    sizeof (ip6_address_t));
2558     }
2559 }
2560
2561 /**
2562  * @brief Delete a multicast Address from the advertised MLD set
2563  */
2564 static void
2565 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2566 {
2567   ip6_mldp_group_t *mcast_group_info;
2568   uword *p;
2569
2570   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2571   mcast_group_info =
2572     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2573
2574   if (mcast_group_info)
2575     {
2576       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2577                    /* old_value */ 0);
2578       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2579     }
2580 }
2581
2582 /**
2583  * @brief Add a multicast Address to the advertised MLD set
2584  */
2585 static void
2586 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2587                           ip6_multicast_address_scope_t scope,
2588                           ip6_multicast_link_local_group_id_t group)
2589 {
2590   ip6_address_t addr;
2591
2592   ip6_set_reserved_multicast_address (&addr, scope, group);
2593
2594   ip6_neighbor_add_mld_prefix (a, &addr);
2595 }
2596
2597 /**
2598  * @brief create and initialize router advertisement parameters with default
2599  * values for this intfc
2600  */
2601 u32
2602 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2603                                    u32 sw_if_index, u32 is_add)
2604 {
2605   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2606   ip6_radv_t *a = 0;
2607   u32 ri = ~0;
2608   vnet_sw_interface_t *sw_if0;
2609   ethernet_interface_t *eth_if0 = 0;
2610
2611   /* lookup radv container  - ethernet interfaces only */
2612   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2613   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2614     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2615
2616   if (!eth_if0)
2617     return ri;
2618
2619   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2620                            ~0);
2621   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2622
2623   if (ri != ~0)
2624     {
2625       a = pool_elt_at_index (nm->if_radv_pool, ri);
2626
2627       if (!is_add)
2628         {
2629           ip6_radv_prefix_t *p;
2630           ip6_mldp_group_t *m;
2631
2632           /* release the lock on the interface's mcast adj */
2633           adj_unlock (a->mcast_adj_index);
2634
2635           /* clean up prefix and MDP pools */
2636           /* *INDENT-OFF* */
2637           pool_flush(p, a->adv_prefixes_pool,
2638           ({
2639               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2640           }));
2641           pool_flush (m, a->mldp_group_pool,
2642           ({
2643               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2644           }));
2645           /* *INDENT-ON* */
2646
2647           pool_free (a->mldp_group_pool);
2648           pool_free (a->adv_prefixes_pool);
2649
2650           mhash_free (&a->address_to_prefix_index);
2651           mhash_free (&a->address_to_mldp_index);
2652
2653           if (a->keep_sending_rs)
2654             a->keep_sending_rs = 0;
2655
2656           pool_put (nm->if_radv_pool, a);
2657           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2658           ri = ~0;
2659         }
2660     }
2661   else
2662     {
2663       if (is_add)
2664         {
2665           pool_get (nm->if_radv_pool, a);
2666
2667           ri = a - nm->if_radv_pool;
2668           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2669
2670           /* initialize default values (most of which are zero) */
2671           clib_memset (a, 0, sizeof (a[0]));
2672
2673           a->sw_if_index = sw_if_index;
2674           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2675           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2676           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2677           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2678
2679           /* send ll address source address option */
2680           a->adv_link_layer_address = 1;
2681
2682           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2683           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2684           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2685           a->seed = (u32) clib_cpu_time_now ();
2686           (void) random_u32 (&a->seed);
2687           a->randomizer = clib_cpu_time_now ();
2688           (void) random_u64 (&a->randomizer);
2689
2690           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2691           a->initial_adverts_sent = a->initial_adverts_count - 1;
2692           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2693
2694           /* deafult is to send */
2695           a->send_radv = 1;
2696
2697           /* fill in radv_info for this interface that will be needed later */
2698           a->adv_link_mtu =
2699             vnet_sw_interface_get_mtu (vnm, sw_if_index, VNET_MTU_IP6);
2700
2701           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2702
2703           /* fill in default link-local address  (this may be overridden) */
2704           ip6_link_local_address_from_ethernet_address
2705             (&a->link_local_address, eth_if0->address);
2706
2707           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2708                       sizeof (ip6_address_t));
2709           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2710                       sizeof (ip6_address_t));
2711
2712           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2713                                                       VNET_LINK_IP6,
2714                                                       sw_if_index);
2715
2716           a->keep_sending_rs = 0;
2717
2718           /* add multicast groups we will always be reporting  */
2719           ip6_neighbor_add_mld_grp (a,
2720                                     IP6_MULTICAST_SCOPE_link_local,
2721                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2722           ip6_neighbor_add_mld_grp (a,
2723                                     IP6_MULTICAST_SCOPE_link_local,
2724                                     IP6_MULTICAST_GROUP_ID_all_routers);
2725           ip6_neighbor_add_mld_grp (a,
2726                                     IP6_MULTICAST_SCOPE_link_local,
2727                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2728         }
2729     }
2730   return ri;
2731 }
2732
2733 /* send an mldpv2 report  */
2734 static void
2735 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2736 {
2737   vnet_main_t *vnm = vnet_get_main ();
2738   vlib_main_t *vm = vnm->vlib_main;
2739   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2740   vnet_sw_interface_t *sw_if0;
2741   ethernet_interface_t *eth_if0;
2742   u32 ri;
2743   int bogus_length;
2744
2745   ip6_radv_t *radv_info;
2746   u16 payload_length;
2747   vlib_buffer_t *b0;
2748   ip6_header_t *ip0;
2749   u32 *to_next;
2750   vlib_frame_t *f;
2751   u32 bo0;
2752   u32 n_to_alloc = 1;
2753   u32 n_allocated;
2754
2755   icmp6_multicast_listener_report_header_t *rh0;
2756   icmp6_multicast_listener_report_packet_t *rp0;
2757
2758   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2759   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2760   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2761
2762   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2763     return;
2764
2765   /* look up the radv_t  information for this interface */
2766   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2767                            ~0);
2768
2769   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2770
2771   if (ri == ~0)
2772     return;
2773
2774   /* send report now - build a mldpv2 report packet  */
2775   n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2776   if (PREDICT_FALSE (n_allocated == 0))
2777     {
2778     alloc_fail:
2779       clib_warning ("buffer allocation failure");
2780       return;
2781     }
2782
2783   b0 = vlib_get_buffer (vm, bo0);
2784
2785   /* adjust the sizeof the buffer to just include the ipv6 header */
2786   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2787
2788   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2789
2790   b0->error = ICMP6_ERROR_NONE;
2791
2792   rp0 = vlib_buffer_get_current (b0);
2793   ip0 = (ip6_header_t *) & rp0->ip;
2794   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2795
2796   clib_memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2797
2798   ip0->ip_version_traffic_class_and_flow_label =
2799     clib_host_to_net_u32 (0x6 << 28);
2800
2801   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2802   /* for DEBUG - vnet driver won't seem to emit router alerts */
2803   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2804   ip0->hop_limit = 1;
2805
2806   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2807
2808   /* source address MUST be the link-local address */
2809   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2810   ip0->src_address = radv_info->link_local_address;
2811
2812   /* destination is all mldpv2 routers */
2813   ip6_set_reserved_multicast_address (&ip0->dst_address,
2814                                       IP6_MULTICAST_SCOPE_link_local,
2815                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2816
2817   /* add reports here */
2818   ip6_mldp_group_t *m;
2819   int num_addr_records = 0;
2820   icmp6_multicast_address_record_t rr;
2821
2822   /* fill in the hop-by-hop extension header (router alert) info */
2823   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2824   rh0->ext_hdr.n_data_u64s = 0;
2825
2826   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2827   rh0->alert.len = 2;
2828   rh0->alert.value = 0;
2829
2830   rh0->pad.type = 1;
2831   rh0->pad.len = 0;
2832
2833   rh0->icmp.checksum = 0;
2834
2835   /* *INDENT-OFF* */
2836   pool_foreach (m, radv_info->mldp_group_pool,
2837   ({
2838     rr.type = m->type;
2839     rr.aux_data_len_u32s = 0;
2840     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2841     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2842
2843     num_addr_records++;
2844
2845     if(vlib_buffer_add_data (vm, &bo0, (void *)&rr,
2846                              sizeof(icmp6_multicast_address_record_t)))
2847       {
2848         vlib_buffer_free (vm, &bo0, 1);
2849         goto alloc_fail;
2850       }
2851
2852     payload_length += sizeof( icmp6_multicast_address_record_t);
2853   }));
2854   /* *INDENT-ON* */
2855
2856   rh0->rsvd = 0;
2857   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2858
2859   /* update lengths */
2860   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2861
2862   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2863                                                           &bogus_length);
2864   ASSERT (bogus_length == 0);
2865
2866   /*
2867    * OK to override w/ no regard for actual FIB, because
2868    * ip6-rewrite only looks at the adjacency.
2869    */
2870   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2871     vnet_main.local_interface_sw_if_index;
2872
2873   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2874   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2875
2876   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2877
2878   f = vlib_get_frame_to_node (vm, node->index);
2879   to_next = vlib_frame_vector_args (f);
2880   to_next[0] = bo0;
2881   f->n_vectors = 1;
2882
2883   vlib_put_frame_to_node (vm, node->index, f);
2884   return;
2885 }
2886
2887 /* *INDENT-OFF* */
2888 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2889 {
2890   .function = icmp6_router_solicitation,
2891   .name = "icmp6-router-solicitation",
2892
2893   .vector_size = sizeof (u32),
2894
2895   .format_trace = format_icmp6_input_trace,
2896
2897   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2898   .next_nodes = {
2899     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
2900     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2901     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2902   },
2903 };
2904 /* *INDENT-ON* */
2905
2906 /* send a RA or update the timer info etc.. */
2907 static uword
2908 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2909                                   vlib_node_runtime_t * node,
2910                                   vlib_frame_t * frame)
2911 {
2912   vnet_main_t *vnm = vnet_get_main ();
2913   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2914   ip6_radv_t *radv_info;
2915   vlib_frame_t *f = 0;
2916   u32 n_this_frame = 0;
2917   u32 n_left_to_next = 0;
2918   u32 *to_next = 0;
2919   u32 bo0;
2920   icmp6_router_solicitation_header_t *h0;
2921   vlib_buffer_t *b0;
2922   f64 now = vlib_time_now (vm);
2923
2924   /* Interface ip6 radv info list */
2925   /* *INDENT-OFF* */
2926   pool_foreach (radv_info, nm->if_radv_pool,
2927   ({
2928     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2929       {
2930         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2931         radv_info->next_multicast_time = now;
2932         radv_info->last_multicast_time = now;
2933         radv_info->last_radv_time = 0;
2934         radv_info->all_routers_mcast = 0;
2935         continue;
2936       }
2937
2938     /* Make sure that we've joined the all-routers multicast group */
2939     if(!radv_info->all_routers_mcast)
2940       {
2941         /* send MDLP_REPORT_EVENT message */
2942         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2943         radv_info->all_routers_mcast = 1;
2944       }
2945
2946     /* is it time to send a multicast  RA on this interface? */
2947     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2948       {
2949         u32 n_to_alloc = 1;
2950         u32 n_allocated;
2951
2952         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2953           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2954
2955         /* multicast send - compute next multicast send time */
2956         if( radv_info->initial_adverts_sent > 0)
2957           {
2958             radv_info->initial_adverts_sent--;
2959             if(rfn > radv_info-> initial_adverts_interval)
2960               rfn =  radv_info-> initial_adverts_interval;
2961
2962             /* check to see if we are ceasing to send */
2963             if( radv_info->initial_adverts_sent  == 0)
2964               if(radv_info->cease_radv)
2965                 radv_info->send_radv = 0;
2966           }
2967
2968         radv_info->next_multicast_time =  rfn + now;
2969         radv_info->last_multicast_time = now;
2970
2971         /* send advert now - build a "solicted" router advert with unspecified source address */
2972         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
2973
2974         if (PREDICT_FALSE(n_allocated == 0))
2975           {
2976             clib_warning ("buffer allocation failure");
2977             continue;
2978           }
2979         b0 = vlib_get_buffer (vm, bo0);
2980         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2981         b0->error = ICMP6_ERROR_NONE;
2982         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2983
2984         h0 =  vlib_buffer_get_current (b0);
2985
2986         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2987
2988         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2989         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2990                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2991         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2992         h0->ip.hop_limit = 255;
2993
2994         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
2995         h0->ip.src_address.as_u64[0] = 0;
2996         h0->ip.src_address.as_u64[1] = 0;
2997
2998         h0->ip.dst_address.as_u64[0] = 0;
2999         h0->ip.dst_address.as_u64[1] = 0;
3000
3001         h0->neighbor.icmp.type = ICMP6_router_solicitation;
3002
3003         if (PREDICT_FALSE(f == 0))
3004           {
3005             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
3006             to_next = vlib_frame_vector_args (f);
3007             n_left_to_next = VLIB_FRAME_SIZE;
3008             n_this_frame = 0;
3009           }
3010
3011         n_this_frame++;
3012         n_left_to_next--;
3013         to_next[0] = bo0;
3014         to_next += 1;
3015
3016         if (PREDICT_FALSE(n_left_to_next == 0))
3017           {
3018             f->n_vectors = n_this_frame;
3019             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3020             f = 0;
3021           }
3022       }
3023   }));
3024   /* *INDENT-ON* */
3025
3026   if (f)
3027     {
3028       ASSERT (n_this_frame);
3029       f->n_vectors = n_this_frame;
3030       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
3031     }
3032   return 0;
3033 }
3034
3035 static uword
3036 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
3037                                            vlib_node_runtime_t * node,
3038                                            vlib_frame_t * frame)
3039 {
3040   uword event_type;
3041   ip6_icmp_neighbor_discovery_event_data_t *event_data;
3042
3043   /* init code here */
3044
3045   while (1)
3046     {
3047       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
3048
3049       event_data = vlib_process_get_event_data (vm, &event_type);
3050
3051       if (!event_data)
3052         {
3053           /* No events found: timer expired. */
3054           /* process interface list and send RAs as appropriate, update timer info */
3055           ip6_neighbor_process_timer_event (vm, node, frame);
3056         }
3057       else
3058         {
3059           switch (event_type)
3060             {
3061
3062             case ICMP6_ND_EVENT_INIT:
3063               break;
3064
3065             case ~0:
3066               break;
3067
3068             default:
3069               ASSERT (0);
3070             }
3071
3072           if (event_data)
3073             _vec_len (event_data) = 0;
3074         }
3075     }
3076   return frame->n_vectors;
3077 }
3078
3079 /* *INDENT-OFF* */
3080 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
3081 {
3082   .function = icmp6_router_advertisement,
3083   .name = "icmp6-router-advertisement",
3084
3085   .vector_size = sizeof (u32),
3086
3087   .format_trace = format_icmp6_input_trace,
3088
3089   .n_next_nodes = 1,
3090   .next_nodes = {
3091     [0] = "ip6-drop",
3092   },
3093 };
3094 /* *INDENT-ON* */
3095
3096 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
3097
3098   .function = ip6_icmp_neighbor_discovery_event_process,
3099   .name = "ip6-icmp-neighbor-discovery-event-process",
3100   .type = VLIB_NODE_TYPE_PROCESS,
3101 };
3102
3103 static uword
3104 icmp6_neighbor_solicitation (vlib_main_t * vm,
3105                              vlib_node_runtime_t * node, vlib_frame_t * frame)
3106 {
3107   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3108                                                        /* is_solicitation */
3109                                                        1);
3110 }
3111
3112 static uword
3113 icmp6_neighbor_advertisement (vlib_main_t * vm,
3114                               vlib_node_runtime_t * node,
3115                               vlib_frame_t * frame)
3116 {
3117   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
3118                                                        /* is_solicitation */
3119                                                        0);
3120 }
3121
3122 /* *INDENT-OFF* */
3123 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
3124 {
3125   .function = icmp6_neighbor_solicitation,
3126   .name = "icmp6-neighbor-solicitation",
3127
3128   .vector_size = sizeof (u32),
3129
3130   .format_trace = format_icmp6_input_trace,
3131
3132   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
3133   .next_nodes = {
3134     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "ip6-drop",
3135     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
3136   },
3137 };
3138 /* *INDENT-ON* */
3139
3140 /* *INDENT-OFF* */
3141 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
3142 {
3143   .function = icmp6_neighbor_advertisement,
3144   .name = "icmp6-neighbor-advertisement",
3145
3146   .vector_size = sizeof (u32),
3147
3148   .format_trace = format_icmp6_input_trace,
3149
3150   .n_next_nodes = 1,
3151   .next_nodes = {
3152     [0] = "ip6-drop",
3153   },
3154 };
3155 /* *INDENT-ON* */
3156
3157 typedef enum
3158 {
3159   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3160   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
3161   IP6_DISCOVER_NEIGHBOR_N_NEXT,
3162 } ip6_discover_neighbor_next_t;
3163
3164 typedef enum
3165 {
3166   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
3167   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
3168   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
3169 } ip6_discover_neighbor_error_t;
3170
3171 static uword
3172 ip6_discover_neighbor_inline (vlib_main_t * vm,
3173                               vlib_node_runtime_t * node,
3174                               vlib_frame_t * frame, int is_glean)
3175 {
3176   vnet_main_t *vnm = vnet_get_main ();
3177   ip6_main_t *im = &ip6_main;
3178   ip_lookup_main_t *lm = &im->lookup_main;
3179   u32 *from, *to_next_drop;
3180   uword n_left_from, n_left_to_next_drop;
3181   u64 seed;
3182   u32 thread_index = vm->thread_index;
3183   int bogus_length;
3184   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3185
3186   if (node->flags & VLIB_NODE_FLAG_TRACE)
3187     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
3188
3189   seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm));
3190
3191   from = vlib_frame_vector_args (frame);
3192   n_left_from = frame->n_vectors;
3193
3194   while (n_left_from > 0)
3195     {
3196       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3197                            to_next_drop, n_left_to_next_drop);
3198
3199       while (n_left_from > 0 && n_left_to_next_drop > 0)
3200         {
3201           u32 pi0, adj_index0, sw_if_index0, drop0, r0, next0;
3202           vnet_hw_interface_t *hw_if0;
3203           ip6_radv_t *radv_info;
3204           ip_adjacency_t *adj0;
3205           vlib_buffer_t *p0;
3206           ip6_header_t *ip0;
3207
3208           pi0 = from[0];
3209
3210           p0 = vlib_get_buffer (vm, pi0);
3211
3212           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
3213
3214           ip0 = vlib_buffer_get_current (p0);
3215
3216           adj0 = adj_get (adj_index0);
3217
3218           if (!is_glean)
3219             {
3220               ip0->dst_address.as_u64[0] =
3221                 adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
3222               ip0->dst_address.as_u64[1] =
3223                 adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
3224             }
3225
3226           sw_if_index0 = adj0->rewrite_header.sw_if_index;
3227           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
3228
3229           /* combine the address and interface for a hash */
3230           r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0;
3231
3232           drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed);
3233
3234           from += 1;
3235           n_left_from -= 1;
3236           to_next_drop[0] = pi0;
3237           to_next_drop += 1;
3238           n_left_to_next_drop -= 1;
3239
3240           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
3241
3242           /* If the interface is link-down, drop the pkt */
3243           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
3244             drop0 = 1;
3245
3246           if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0)
3247             {
3248               u32 ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
3249
3250               if (ri != ~0)
3251                 radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3252               else
3253                 drop0 = 1;
3254             }
3255           else
3256             drop0 = 1;
3257
3258           /*
3259            * the adj has been updated to a rewrite but the node the DPO that got
3260            * us here hasn't - yet. no big deal. we'll drop while we wait.
3261            */
3262           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
3263             drop0 = 1;
3264
3265           p0->error =
3266             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
3267                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
3268
3269           if (drop0)
3270             continue;
3271
3272           {
3273             u32 bi0 = 0;
3274             icmp6_neighbor_solicitation_header_t *h0;
3275             vlib_buffer_t *b0;
3276
3277             h0 = vlib_packet_template_get_packet
3278               (vm, &im->discover_neighbor_packet_template, &bi0);
3279             if (!h0)
3280               continue;
3281
3282             /* copy the persistent fields from the original */
3283             b0 = vlib_get_buffer (vm, bi0);
3284             clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
3285
3286             /*
3287              * Build ethernet header.
3288              * Choose source address based on destination lookup
3289              * adjacency.
3290              */
3291             if (!ip6_src_address_for_packet (lm,
3292                                              sw_if_index0,
3293                                              &ip0->dst_address,
3294                                              &h0->ip.src_address))
3295               {
3296                 /* There is no address on the interface */
3297                 p0->error =
3298                   node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
3299                 vlib_buffer_free (vm, &bi0, 1);
3300                 continue;
3301               }
3302
3303             /*
3304              * Destination address is a solicited node multicast address.
3305              * We need to fill in
3306              * the low 24 bits with low 24 bits of target's address.
3307              */
3308             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
3309             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
3310             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
3311
3312             h0->neighbor.target_address = ip0->dst_address;
3313
3314             clib_memcpy (h0->link_layer_option.ethernet_address,
3315                          hw_if0->hw_address, vec_len (hw_if0->hw_address));
3316
3317             /* $$$$ appears we need this; why is the checksum non-zero? */
3318             h0->neighbor.icmp.checksum = 0;
3319             h0->neighbor.icmp.checksum =
3320               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
3321                                                  &bogus_length);
3322
3323             ASSERT (bogus_length == 0);
3324
3325             vlib_buffer_copy_trace_flag (vm, p0, bi0);
3326             vnet_buffer (b0)->sw_if_index[VLIB_TX]
3327               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
3328
3329             vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
3330               radv_info->mcast_adj_index;
3331
3332             b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
3333             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
3334
3335             vlib_set_next_frame_buffer (vm, node, next0, bi0);
3336           }
3337         }
3338
3339       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
3340                            n_left_to_next_drop);
3341     }
3342
3343   return frame->n_vectors;
3344 }
3345
3346 static uword
3347 ip6_discover_neighbor (vlib_main_t * vm,
3348                        vlib_node_runtime_t * node, vlib_frame_t * frame)
3349 {
3350   return (ip6_discover_neighbor_inline (vm, node, frame, 0));
3351 }
3352
3353 static uword
3354 ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
3355 {
3356   return (ip6_discover_neighbor_inline (vm, node, frame, 1));
3357 }
3358
3359 static char *ip6_discover_neighbor_error_strings[] = {
3360   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
3361   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
3362   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
3363     = "no source address for ND solicitation",
3364 };
3365
3366 /* *INDENT-OFF* */
3367 VLIB_REGISTER_NODE (ip6_glean_node) =
3368 {
3369   .function = ip6_glean,
3370   .name = "ip6-glean",
3371   .vector_size = sizeof (u32),
3372   .format_trace = format_ip6_forward_next_trace,
3373   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3374   .error_strings = ip6_discover_neighbor_error_strings,
3375   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3376   .next_nodes =
3377   {
3378     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3379     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3380   },
3381 };
3382 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
3383 {
3384   .function = ip6_discover_neighbor,
3385   .name = "ip6-discover-neighbor",
3386   .vector_size = sizeof (u32),
3387   .format_trace = format_ip6_forward_next_trace,
3388   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
3389   .error_strings = ip6_discover_neighbor_error_strings,
3390   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
3391   .next_nodes =
3392   {
3393     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop",
3394     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
3395   },
3396 };
3397 /* *INDENT-ON* */
3398
3399 /* API support functions */
3400 int
3401 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
3402                         u8 suppress, u8 managed, u8 other,
3403                         u8 ll_option, u8 send_unicast, u8 cease,
3404                         u8 use_lifetime, u32 lifetime,
3405                         u32 initial_count, u32 initial_interval,
3406                         u32 max_interval, u32 min_interval, u8 is_no)
3407 {
3408   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3409   int error;
3410   u32 ri;
3411
3412   /* look up the radv_t  information for this interface */
3413   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3414                            ~0);
3415   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3416   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3417
3418   if (!error)
3419     {
3420
3421       ip6_radv_t *radv_info;
3422       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3423
3424       if ((max_interval != 0) && (min_interval == 0))
3425         min_interval = .75 * max_interval;
3426
3427       max_interval =
3428         (max_interval !=
3429          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
3430         radv_info->max_radv_interval;
3431       min_interval =
3432         (min_interval !=
3433          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
3434         radv_info->min_radv_interval;
3435       lifetime =
3436         (use_lifetime !=
3437          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
3438         radv_info->adv_router_lifetime_in_sec;
3439
3440       if (lifetime)
3441         {
3442           if (lifetime > MAX_DEF_RTR_LIFETIME)
3443             lifetime = MAX_DEF_RTR_LIFETIME;
3444
3445           if (lifetime <= max_interval)
3446             return VNET_API_ERROR_INVALID_VALUE;
3447         }
3448
3449       if (min_interval != 0)
3450         {
3451           if ((min_interval > .75 * max_interval) || (min_interval < 3))
3452             return VNET_API_ERROR_INVALID_VALUE;
3453         }
3454
3455       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
3456           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
3457         return VNET_API_ERROR_INVALID_VALUE;
3458
3459       /*
3460          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
3461          if "flag" is clear  don't change corresponding value
3462        */
3463       radv_info->send_radv =
3464         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
3465       radv_info->adv_managed_flag =
3466         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
3467       radv_info->adv_other_flag =
3468         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
3469       radv_info->adv_link_layer_address =
3470         (ll_option !=
3471          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
3472       radv_info->send_unicast =
3473         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
3474       radv_info->cease_radv =
3475         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
3476
3477       radv_info->min_radv_interval = min_interval;
3478       radv_info->max_radv_interval = max_interval;
3479       radv_info->adv_router_lifetime_in_sec = lifetime;
3480
3481       radv_info->initial_adverts_count =
3482         (initial_count !=
3483          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
3484         radv_info->initial_adverts_count;
3485       radv_info->initial_adverts_interval =
3486         (initial_interval !=
3487          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
3488         radv_info->initial_adverts_interval;
3489
3490       /* restart */
3491       if ((cease != 0) && (is_no))
3492         radv_info->send_radv = 1;
3493
3494       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3495       radv_info->next_multicast_time = vlib_time_now (vm);
3496       radv_info->last_multicast_time = vlib_time_now (vm);
3497       radv_info->last_radv_time = 0;
3498     }
3499   return (error);
3500 }
3501
3502 int
3503 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
3504                         ip6_address_t * prefix_addr, u8 prefix_len,
3505                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
3506                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
3507                         u8 no_onlink, u8 is_no)
3508 {
3509   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3510   int error;
3511
3512   u32 ri;
3513
3514   /* look up the radv_t  information for this interface */
3515   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3516                            ~0);
3517
3518   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3519
3520   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
3521
3522   if (!error)
3523     {
3524       f64 now = vlib_time_now (vm);
3525       ip6_radv_t *radv_info;
3526       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3527
3528       /* prefix info add, delete or update */
3529       ip6_radv_prefix_t *prefix;
3530
3531       /* lookup  prefix info for this  address on this interface */
3532       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
3533
3534       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
3535
3536       if (is_no)
3537         {
3538           /* delete */
3539           if (!prefix)
3540             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
3541
3542           if (prefix->prefix_len != prefix_len)
3543             return VNET_API_ERROR_INVALID_VALUE_2;
3544
3545           /* FIXME - Should the DP do this or the CP ? */
3546           /* do specific delete processing here before returning */
3547           /* try to remove from routing table */
3548
3549           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
3550                        /* old_value */ 0);
3551           pool_put (radv_info->adv_prefixes_pool, prefix);
3552
3553           radv_info->initial_adverts_sent =
3554             radv_info->initial_adverts_count - 1;
3555           radv_info->next_multicast_time = vlib_time_now (vm);
3556           radv_info->last_multicast_time = vlib_time_now (vm);
3557           radv_info->last_radv_time = 0;
3558           return (error);
3559         }
3560
3561       /* adding or changing */
3562       if (!prefix)
3563         {
3564           /* add */
3565           u32 pi;
3566           pool_get (radv_info->adv_prefixes_pool, prefix);
3567           pi = prefix - radv_info->adv_prefixes_pool;
3568           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
3569                      /* old_value */ 0);
3570
3571           clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
3572
3573           prefix->prefix_len = prefix_len;
3574           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
3575
3576           /* initialize default values */
3577           prefix->adv_on_link_flag = 1; /* L bit set */
3578           prefix->adv_autonomous_flag = 1;      /* A bit set */
3579           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
3580           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
3581           prefix->enabled = 1;
3582           prefix->decrement_lifetime_flag = 1;
3583           prefix->deprecated_prefix_flag = 1;
3584
3585           if (off_link == 0)
3586             {
3587               /* FIXME - Should the DP do this or the CP ? */
3588               /* insert prefix into routing table as a connected prefix */
3589             }
3590
3591           if (use_default)
3592             goto restart;
3593         }
3594       else
3595         {
3596
3597           if (prefix->prefix_len != prefix_len)
3598             return VNET_API_ERROR_INVALID_VALUE_2;
3599
3600           if (off_link != 0)
3601             {
3602               /* FIXME - Should the DP do this or the CP ? */
3603               /* remove from routing table if already there */
3604             }
3605         }
3606
3607       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
3608         {
3609           prefix->adv_valid_lifetime_in_secs = ~0;
3610           prefix->adv_pref_lifetime_in_secs = ~0;
3611           prefix->decrement_lifetime_flag = 0;
3612         }
3613       else
3614         {
3615           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
3616           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
3617         }
3618
3619       /* copy  remaining */
3620       prefix->enabled = !(no_advertise != 0);
3621       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
3622       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
3623
3624     restart:
3625       /* restart */
3626       /* fill in the expiration times  */
3627       prefix->valid_lifetime_expires =
3628         now + prefix->adv_valid_lifetime_in_secs;
3629       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
3630
3631       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
3632       radv_info->next_multicast_time = vlib_time_now (vm);
3633       radv_info->last_multicast_time = vlib_time_now (vm);
3634       radv_info->last_radv_time = 0;
3635     }
3636   return (error);
3637 }
3638
3639 clib_error_t *
3640 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
3641                   vlib_cli_command_t * cmd)
3642 {
3643   vnet_main_t *vnm = vnet_get_main ();
3644   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3645   clib_error_t *error = 0;
3646   u8 is_no = 0;
3647   u8 suppress = 0, managed = 0, other = 0;
3648   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
3649   u8 use_lifetime = 0;
3650   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
3651     0, ra_initial_interval = 0;
3652   u32 ra_max_interval = 0, ra_min_interval = 0;
3653
3654   unformat_input_t _line_input, *line_input = &_line_input;
3655   vnet_sw_interface_t *sw_if0;
3656
3657   int add_radv_info = 1;
3658   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
3659   ip6_address_t ip6_addr;
3660   u32 addr_len;
3661
3662
3663   /* Get a line of input. */
3664   if (!unformat_user (main_input, unformat_line_input, line_input))
3665     return 0;
3666
3667   /* get basic radv info for this interface */
3668   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3669     {
3670
3671       if (unformat_user (line_input,
3672                          unformat_vnet_sw_interface, vnm, &sw_if_index))
3673         {
3674           u32 ri;
3675           ethernet_interface_t *eth_if0 = 0;
3676
3677           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3678           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3679             eth_if0 =
3680               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3681
3682           if (!eth_if0)
3683             {
3684               error =
3685                 clib_error_return (0, "Interface must be of ethernet type");
3686               goto done;
3687             }
3688
3689           /* look up the radv_t  information for this interface */
3690           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3691                                    sw_if_index, ~0);
3692
3693           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3694
3695           if (ri != ~0)
3696             {
3697               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3698             }
3699           else
3700             {
3701               error = clib_error_return (0, "unknown interface %U'",
3702                                          format_unformat_error, line_input);
3703               goto done;
3704             }
3705         }
3706       else
3707         {
3708           error = clib_error_return (0, "invalid interface name %U'",
3709                                      format_unformat_error, line_input);
3710           goto done;
3711         }
3712     }
3713
3714   /* get the rest of the command */
3715   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3716     {
3717       if (unformat (line_input, "no"))
3718         is_no = 1;
3719       else if (unformat (line_input, "prefix %U/%d",
3720                          unformat_ip6_address, &ip6_addr, &addr_len))
3721         {
3722           add_radv_info = 0;
3723           break;
3724         }
3725       else if (unformat (line_input, "ra-managed-config-flag"))
3726         {
3727           managed = 1;
3728           break;
3729         }
3730       else if (unformat (line_input, "ra-other-config-flag"))
3731         {
3732           other = 1;
3733           break;
3734         }
3735       else if (unformat (line_input, "ra-suppress") ||
3736                unformat (line_input, "ra-surpress"))
3737         {
3738           suppress = 1;
3739           break;
3740         }
3741       else if (unformat (line_input, "ra-suppress-link-layer") ||
3742                unformat (line_input, "ra-surpress-link-layer"))
3743         {
3744           suppress_ll_option = 1;
3745           break;
3746         }
3747       else if (unformat (line_input, "ra-send-unicast"))
3748         {
3749           send_unicast = 1;
3750           break;
3751         }
3752       else if (unformat (line_input, "ra-lifetime"))
3753         {
3754           if (!unformat (line_input, "%d", &ra_lifetime))
3755             {
3756               error = unformat_parse_error (line_input);
3757               goto done;
3758             }
3759           use_lifetime = 1;
3760           break;
3761         }
3762       else if (unformat (line_input, "ra-initial"))
3763         {
3764           if (!unformat
3765               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3766             {
3767               error = unformat_parse_error (line_input);
3768               goto done;
3769             }
3770           break;
3771         }
3772       else if (unformat (line_input, "ra-interval"))
3773         {
3774           if (!unformat (line_input, "%d", &ra_max_interval))
3775             {
3776               error = unformat_parse_error (line_input);
3777               goto done;
3778             }
3779
3780           if (!unformat (line_input, "%d", &ra_min_interval))
3781             ra_min_interval = 0;
3782           break;
3783         }
3784       else if (unformat (line_input, "ra-cease"))
3785         {
3786           cease = 1;
3787           break;
3788         }
3789       else
3790         {
3791           error = unformat_parse_error (line_input);
3792           goto done;
3793         }
3794     }
3795
3796   if (add_radv_info)
3797     {
3798       ip6_neighbor_ra_config (vm, sw_if_index,
3799                               suppress, managed, other,
3800                               suppress_ll_option, send_unicast, cease,
3801                               use_lifetime, ra_lifetime,
3802                               ra_initial_count, ra_initial_interval,
3803                               ra_max_interval, ra_min_interval, is_no);
3804     }
3805   else
3806     {
3807       u32 valid_lifetime_in_secs = 0;
3808       u32 pref_lifetime_in_secs = 0;
3809       u8 use_prefix_default_values = 0;
3810       u8 no_advertise = 0;
3811       u8 off_link = 0;
3812       u8 no_autoconfig = 0;
3813       u8 no_onlink = 0;
3814
3815       /* get the rest of the command */
3816       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3817         {
3818           if (unformat (line_input, "default"))
3819             {
3820               use_prefix_default_values = 1;
3821               break;
3822             }
3823           else if (unformat (line_input, "infinite"))
3824             {
3825               valid_lifetime_in_secs = ~0;
3826               pref_lifetime_in_secs = ~0;
3827               break;
3828             }
3829           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3830                              &pref_lifetime_in_secs))
3831             break;
3832           else
3833             break;
3834         }
3835
3836
3837       /* get the rest of the command */
3838       while (!use_prefix_default_values &&
3839              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3840         {
3841           if (unformat (line_input, "no-advertise"))
3842             no_advertise = 1;
3843           else if (unformat (line_input, "off-link"))
3844             off_link = 1;
3845           else if (unformat (line_input, "no-autoconfig"))
3846             no_autoconfig = 1;
3847           else if (unformat (line_input, "no-onlink"))
3848             no_onlink = 1;
3849           else
3850             {
3851               error = unformat_parse_error (line_input);
3852               goto done;
3853             }
3854         }
3855
3856       ip6_neighbor_ra_prefix (vm, sw_if_index,
3857                               &ip6_addr, addr_len,
3858                               use_prefix_default_values,
3859                               valid_lifetime_in_secs,
3860                               pref_lifetime_in_secs,
3861                               no_advertise,
3862                               off_link, no_autoconfig, no_onlink, is_no);
3863     }
3864
3865 done:
3866   unformat_free (line_input);
3867
3868   return error;
3869 }
3870
3871 static void
3872 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3873 {
3874   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3875   u32 i;
3876
3877   for (i = 0; i < vec_len (addrs); i++)
3878     {
3879       ip_interface_address_t *a =
3880         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3881       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3882
3883       vlib_cli_output (vm, "\t\t%U/%d",
3884                        format_ip6_address, address, a->address_length);
3885     }
3886 }
3887
3888 static clib_error_t *
3889 show_ip6_interface_cmd (vlib_main_t * vm,
3890                         unformat_input_t * input, vlib_cli_command_t * cmd)
3891 {
3892   vnet_main_t *vnm = vnet_get_main ();
3893   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3894   clib_error_t *error = 0;
3895   u32 sw_if_index;
3896
3897   sw_if_index = ~0;
3898
3899   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3900     {
3901       u32 ri;
3902
3903       /* look up the radv_t  information for this interface */
3904       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3905                                sw_if_index, ~0);
3906
3907       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3908
3909       if (ri != ~0)
3910         {
3911           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3912           ip6_radv_t *radv_info;
3913           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3914
3915           vlib_cli_output (vm, "%U is admin %s\n",
3916                            format_vnet_sw_interface_name, vnm,
3917                            vnet_get_sw_interface (vnm, sw_if_index),
3918                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3919                             "up" : "down"));
3920
3921           u32 ai;
3922           u32 *link_scope = 0, *global_scope = 0;
3923           u32 *local_scope = 0, *unknown_scope = 0;
3924           ip_interface_address_t *a;
3925
3926           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3927                                    sw_if_index, ~0);
3928           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3929
3930           while (ai != (u32) ~ 0)
3931             {
3932               a = pool_elt_at_index (lm->if_address_pool, ai);
3933               ip6_address_t *address =
3934                 ip_interface_address_get_address (lm, a);
3935
3936               if (ip6_address_is_link_local_unicast (address))
3937                 vec_add1 (link_scope, ai);
3938               else if (ip6_address_is_global_unicast (address))
3939                 vec_add1 (global_scope, ai);
3940               else if (ip6_address_is_local_unicast (address))
3941                 vec_add1 (local_scope, ai);
3942               else
3943                 vec_add1 (unknown_scope, ai);
3944
3945               ai = a->next_this_sw_interface;
3946             }
3947
3948           if (vec_len (link_scope))
3949             {
3950               vlib_cli_output (vm, "\tLink-local address(es):\n");
3951               ip6_print_addrs (vm, link_scope);
3952               vec_free (link_scope);
3953             }
3954
3955           if (vec_len (local_scope))
3956             {
3957               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3958               ip6_print_addrs (vm, local_scope);
3959               vec_free (local_scope);
3960             }
3961
3962           if (vec_len (global_scope))
3963             {
3964               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3965               ip6_print_addrs (vm, global_scope);
3966               vec_free (global_scope);
3967             }
3968
3969           if (vec_len (unknown_scope))
3970             {
3971               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3972               ip6_print_addrs (vm, unknown_scope);
3973               vec_free (unknown_scope);
3974             }
3975
3976           vlib_cli_output (vm, "\tLink-local address(es):\n");
3977           vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3978                            &radv_info->link_local_address);
3979
3980           vlib_cli_output (vm, "\tJoined group address(es):\n");
3981           ip6_mldp_group_t *m;
3982           /* *INDENT-OFF* */
3983           pool_foreach (m, radv_info->mldp_group_pool,
3984           ({
3985             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3986                              &m->mcast_address);
3987           }));
3988           /* *INDENT-ON* */
3989
3990           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3991           ip6_radv_prefix_t *p;
3992           /* *INDENT-OFF* */
3993           pool_foreach (p, radv_info->adv_prefixes_pool,
3994           ({
3995             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
3996                              format_ip6_address, &p->prefix, p->prefix_len);
3997           }));
3998           /* *INDENT-ON* */
3999
4000           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
4001           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
4002           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
4003           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
4004           vlib_cli_output (vm, "\tND DAD is disabled\n");
4005           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
4006           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
4007                            radv_info->adv_neighbor_reachable_time_in_msec);
4008           vlib_cli_output (vm,
4009                            "\tND advertised retransmit interval is %d (msec)\n",
4010                            radv_info->
4011                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
4012
4013           u32 ra_interval = radv_info->max_radv_interval;
4014           u32 ra_interval_min = radv_info->min_radv_interval;
4015           vlib_cli_output (vm,
4016                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
4017                            ra_interval, ra_interval_min);
4018           vlib_cli_output (vm,
4019                            "\tND router advertisements live for %d seconds\n",
4020                            radv_info->adv_router_lifetime_in_sec);
4021           vlib_cli_output (vm,
4022                            "\tHosts %s stateless autoconfig for addresses\n",
4023                            (radv_info->adv_managed_flag) ? "use" :
4024                            " don't use");
4025           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
4026                            radv_info->n_advertisements_sent);
4027           vlib_cli_output (vm, "\tND router solicitations received %d\n",
4028                            radv_info->n_solicitations_rcvd);
4029           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
4030                            radv_info->n_solicitations_dropped);
4031         }
4032       else
4033         {
4034           error = clib_error_return (0, "IPv6 not enabled on interface",
4035                                      format_unformat_error, input);
4036
4037         }
4038     }
4039   return error;
4040 }
4041
4042 /*?
4043  * This command is used to display various IPv6 attributes on a given
4044  * interface.
4045  *
4046  * @cliexpar
4047  * Example of how to display IPv6 settings:
4048  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4049  * GigabitEthernet2/0/0 is admin up
4050  *         Link-local address(es):
4051  *                 fe80::ab8/64
4052  *         Joined group address(es):
4053  *                 ff02::1
4054  *                 ff02::2
4055  *                 ff02::16
4056  *                 ff02::1:ff00:ab8
4057  *         Advertised Prefixes:
4058  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
4059  *         MTU is 1500
4060  *         ICMP error messages are unlimited
4061  *         ICMP redirects are disabled
4062  *         ICMP unreachables are not sent
4063  *         ND DAD is disabled
4064  *         ND advertised reachable time is 0
4065  *         ND advertised retransmit interval is 0 (msec)
4066  *         ND router advertisements are sent every 200 seconds (min interval is 150)
4067  *         ND router advertisements live for 600 seconds
4068  *         Hosts use stateless autoconfig for addresses
4069  *         ND router advertisements sent 19336
4070  *         ND router solicitations received 0
4071  *         ND router solicitations dropped 0
4072  * @cliexend
4073  * Example of output if IPv6 is not enabled on the interface:
4074  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
4075  * show ip6 interface: IPv6 not enabled on interface
4076  * @cliexend
4077 ?*/
4078 /* *INDENT-OFF* */
4079 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
4080 {
4081   .path = "show ip6 interface",
4082   .function = show_ip6_interface_cmd,
4083   .short_help = "show ip6 interface <interface>",
4084 };
4085 /* *INDENT-ON* */
4086
4087 clib_error_t *
4088 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4089 {
4090   clib_error_t *error = 0;
4091   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4092   u32 ri;
4093
4094   /* look up the radv_t  information for this interface */
4095   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4096                            ~0);
4097   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4098
4099   /* if not created - do nothing */
4100   if (ri != ~0)
4101     {
4102       ip6_radv_t *radv_info;
4103
4104       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4105
4106       /* check radv_info ref count for other ip6 addresses on this interface */
4107       /* This implicitly excludes the link local address */
4108       if (radv_info->ref_count == 0)
4109         {
4110           /* essentially "disables" ipv6 on this interface */
4111           ip6_ll_prefix_t ilp = {
4112             .ilp_addr = radv_info->link_local_address,
4113             .ilp_sw_if_index = sw_if_index,
4114           };
4115           ip6_ll_table_entry_delete (&ilp);
4116           ip6_sw_interface_enable_disable (sw_if_index, 0);
4117           ip6_mfib_interface_enable_disable (sw_if_index, 0);
4118           ip6_neighbor_sw_interface_add_del (vnet_get_main (), sw_if_index,
4119                                              0);
4120         }
4121     }
4122   return error;
4123 }
4124
4125 int
4126 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
4127 {
4128   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4129   u32 ri = ~0;
4130
4131   /* look up the radv_t  information for this interface */
4132   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4133                            ~0);
4134
4135   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4136
4137   return ri != ~0;
4138 }
4139
4140 clib_error_t *
4141 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
4142 {
4143   clib_error_t *error = 0;
4144   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4145   u32 ri;
4146   int is_add = 1;
4147
4148   /* look up the radv_t  information for this interface */
4149   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
4150                            ~0);
4151
4152   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4153
4154   /* if not created yet */
4155   if (ri == ~0)
4156     {
4157       vnet_main_t *vnm = vnet_get_main ();
4158       vnet_sw_interface_t *sw_if0;
4159
4160       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
4161       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
4162         {
4163           ethernet_interface_t *eth_if0;
4164
4165           eth_if0 =
4166             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
4167           if (eth_if0)
4168             {
4169               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
4170               ri =
4171                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
4172
4173               if (ri != ~0)
4174                 {
4175                   ip6_radv_t *radv_info;
4176                   ip6_address_t link_local_address;
4177
4178                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4179
4180                   ip6_link_local_address_from_ethernet_mac_address
4181                     (&link_local_address, eth_if0->address);
4182
4183                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
4184                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB ||
4185                       sw_if0->type == VNET_SW_INTERFACE_TYPE_PIPE ||
4186                       sw_if0->type == VNET_SW_INTERFACE_TYPE_P2P)
4187                     {
4188                       /* make up  an interface id */
4189                       link_local_address.as_u64[1] =
4190                         random_u64 (&radv_info->randomizer);
4191
4192                       link_local_address.as_u64[0] =
4193                         clib_host_to_net_u64 (0xFE80000000000000ULL);
4194                       /* clear u bit */
4195                       link_local_address.as_u8[8] &= 0xfd;
4196                     }
4197                   {
4198                     ip6_ll_prefix_t ilp = {
4199                       .ilp_addr = link_local_address,
4200                       .ilp_sw_if_index = sw_if_index,
4201                     };
4202
4203                     ip6_ll_table_entry_update (&ilp, FIB_ROUTE_PATH_LOCAL);
4204                   }
4205
4206                   /* essentially "enables" ipv6 on this interface */
4207                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
4208                   ip6_sw_interface_enable_disable (sw_if_index, 1);
4209
4210                   if (!error)
4211                     {
4212                       radv_info->link_local_address = link_local_address;
4213                     }
4214                 }
4215             }
4216         }
4217     }
4218   return error;
4219 }
4220
4221 int
4222 ip6_get_ll_address (u32 sw_if_index, ip6_address_t * addr)
4223 {
4224   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4225   ip6_radv_t *radv_info;
4226   u32 ri;
4227
4228   if (vec_len (nm->if_radv_pool_index_by_sw_if_index) <= sw_if_index)
4229     return 0;
4230
4231   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4232
4233   if (ri == ~0)
4234     return 0;
4235
4236   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4237   *addr = radv_info->link_local_address;
4238
4239   return (!0);
4240 }
4241
4242 static clib_error_t *
4243 enable_ip6_interface_cmd (vlib_main_t * vm,
4244                           unformat_input_t * input, vlib_cli_command_t * cmd)
4245 {
4246   vnet_main_t *vnm = vnet_get_main ();
4247   clib_error_t *error = 0;
4248   u32 sw_if_index;
4249
4250   sw_if_index = ~0;
4251
4252   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4253     {
4254       enable_ip6_interface (vm, sw_if_index);
4255     }
4256   else
4257     {
4258       error = clib_error_return (0, "unknown interface\n'",
4259                                  format_unformat_error, input);
4260
4261     }
4262   return error;
4263 }
4264
4265 /*?
4266  * This command is used to enable IPv6 on a given interface.
4267  *
4268  * @cliexpar
4269  * Example of how enable IPv6 on a given interface:
4270  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
4271 ?*/
4272 /* *INDENT-OFF* */
4273 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
4274 {
4275   .path = "enable ip6 interface",
4276   .function = enable_ip6_interface_cmd,
4277   .short_help = "enable ip6 interface <interface>",
4278 };
4279 /* *INDENT-ON* */
4280
4281 static clib_error_t *
4282 disable_ip6_interface_cmd (vlib_main_t * vm,
4283                            unformat_input_t * input, vlib_cli_command_t * cmd)
4284 {
4285   vnet_main_t *vnm = vnet_get_main ();
4286   clib_error_t *error = 0;
4287   u32 sw_if_index;
4288
4289   sw_if_index = ~0;
4290
4291   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4292     {
4293       error = disable_ip6_interface (vm, sw_if_index);
4294     }
4295   else
4296     {
4297       error = clib_error_return (0, "unknown interface\n'",
4298                                  format_unformat_error, input);
4299
4300     }
4301   return error;
4302 }
4303
4304 /*?
4305  * This command is used to disable IPv6 on a given interface.
4306  *
4307  * @cliexpar
4308  * Example of how disable IPv6 on a given interface:
4309  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
4310 ?*/
4311 /* *INDENT-OFF* */
4312 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
4313 {
4314   .path = "disable ip6 interface",
4315   .function = disable_ip6_interface_cmd,
4316   .short_help = "disable ip6 interface <interface>",
4317 };
4318 /* *INDENT-ON* */
4319
4320 /*?
4321  * This command is used to configure the neighbor discovery
4322  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
4323  * command to display some of the current neighbor discovery parameters
4324  * on a given interface. This command has three formats:
4325  *
4326  *
4327  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
4328  *
4329  * '<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>'
4330  *
4331  * Where:
4332  *
4333  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
4334  * router-advertisement messages to use stateful address
4335  * auto-configuration to obtain address information (sets the M-bit).
4336  * Default is the M-bit is not set and the '<em>no</em>' option
4337  * returns it to this default state.
4338  *
4339  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
4340  * router-advertisement messages that hosts use stateful auto
4341  * configuration to obtain nonaddress related information (sets
4342  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
4343  * option returns it to this default state.
4344  *
4345  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
4346  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
4347  * router-advertisement messages.
4348  *
4349  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
4350  * optional source link-layer address in the ICMPv6 router-advertisement
4351  * messages. Default is to include the optional source link-layer address
4352  * and the '<em>no</em>' option returns it to this default state.
4353  *
4354  * <em>[no] ra-send-unicast</em> - Use the source address of the
4355  * router-solicitation message if availiable. The default is to use
4356  * multicast address of all nodes, and the '<em>no</em>' option returns
4357  * it to this default state.
4358  *
4359  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
4360  * default router in ICMPv6 router-advertisement messages. The range is
4361  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
4362  * '<em><max-interval></em>'. The default value is 600 seconds and the
4363  * '<em>no</em>' option returns it to this default value.
4364  *
4365  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
4366  * router-advertisement messages sent and the interval between each
4367  * message. Range for count is 1 - 3 and default is 3. Range for interval
4368  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
4369  * returns both to their default value.
4370  *
4371  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
4372  * interval between sending ICMPv6 router-advertisement messages. The
4373  * range for max-interval is from 4 to 200 seconds. min-interval can not
4374  * be more than 75% of max-interval. If not set, min-interval will be
4375  * set to 75% of max-interval. The range for min-interval is from 3 to
4376  * 150 seconds.  The '<em>no</em>' option returns both to their default
4377  * value.
4378  *
4379  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
4380  * The '<em>no</em>' options implies to start (or restart) sending
4381  * ICMPv6 router-advertisement messages.
4382  *
4383  *
4384  * <b>Format 2 - Prefix Options:</b>
4385  *
4386  * '<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>'
4387  *
4388  * Where:
4389  *
4390  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
4391  *
4392  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
4393  * length of time in seconds during what the prefix is valid for the purpose of
4394  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
4395  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
4396  * length of time in seconds during what addresses generated from the prefix remain
4397  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
4398  *
4399  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
4400  * are inifinte, no timeout.
4401  *
4402  * <em>no-advertise</em> - Do not send full router address in prefix
4403  * advertisement. Default is to advertise (i.e. - This flag is off by default).
4404  *
4405  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
4406  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
4407  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
4408  *
4409  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
4410  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
4411  *
4412  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
4413  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
4414  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
4415  * the L-bit.
4416  *
4417  *
4418  * <b>Format 3: - Default of Prefix:</b>
4419  *
4420  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
4421  *
4422  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
4423  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
4424  * is ignored and the prefix is deleted.
4425  *
4426  *
4427  * @cliexpar
4428  * Example of how set a router advertisement option:
4429  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
4430  * Example of how to add a prefix:
4431  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
4432  * Example of how to delete a prefix:
4433  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
4434 ?*/
4435 /* *INDENT-OFF* */
4436 VLIB_CLI_COMMAND (ip6_nd_command, static) =
4437 {
4438   .path = "ip6 nd",
4439   .short_help = "ip6 nd <interface> ...",
4440   .function = ip6_neighbor_cmd,
4441 };
4442 /* *INDENT-ON* */
4443
4444 clib_error_t *
4445 ip6_neighbor_set_link_local_address (vlib_main_t * vm, u32 sw_if_index,
4446                                      ip6_address_t * address)
4447 {
4448   clib_error_t *error = 0;
4449   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4450   u32 ri;
4451   ip6_radv_t *radv_info;
4452   vnet_main_t *vnm = vnet_get_main ();
4453   ip6_ll_prefix_t pfx = { 0, };
4454
4455   if (!ip6_address_is_link_local_unicast (address))
4456     return (error = clib_error_return (0, "address not link-local",
4457                                        format_unformat_error));
4458
4459   /* call enable ipv6  */
4460   enable_ip6_interface (vm, sw_if_index);
4461
4462   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4463
4464   if (ri != ~0)
4465     {
4466       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4467
4468       pfx.ilp_sw_if_index = sw_if_index;
4469
4470       pfx.ilp_addr = radv_info->link_local_address;
4471       ip6_ll_table_entry_delete (&pfx);
4472
4473       pfx.ilp_addr = *address;
4474       ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_LOCAL);
4475
4476       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4477       radv_info->link_local_address = *address;
4478     }
4479   else
4480     {
4481       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
4482       error = clib_error_return (0, "ip6 not enabled for interface",
4483                                  format_unformat_error);
4484     }
4485   return error;
4486 }
4487
4488 /**
4489  * @brief callback when an interface address is added or deleted
4490  */
4491 static void
4492 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
4493                                         uword opaque,
4494                                         u32 sw_if_index,
4495                                         ip6_address_t * address,
4496                                         u32 address_length,
4497                                         u32 if_address_index, u32 is_delete)
4498 {
4499   vnet_main_t *vnm = vnet_get_main ();
4500   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4501   u32 ri;
4502   vlib_main_t *vm = vnm->vlib_main;
4503   ip6_radv_t *radv_info;
4504   ip6_address_t a;
4505
4506   /* create solicited node multicast address for this interface address */
4507   ip6_set_solicited_node_multicast_address (&a, 0);
4508
4509   a.as_u8[0xd] = address->as_u8[0xd];
4510   a.as_u8[0xe] = address->as_u8[0xe];
4511   a.as_u8[0xf] = address->as_u8[0xf];
4512
4513   if (!is_delete)
4514     {
4515       /* try to  create radv_info - does nothing if ipv6 already enabled */
4516       enable_ip6_interface (vm, sw_if_index);
4517
4518       /* look up the radv_t  information for this interface */
4519       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4520                                sw_if_index, ~0);
4521       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4522       if (ri != ~0)
4523         {
4524           /* get radv_info */
4525           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4526
4527           /* add address */
4528           if (!ip6_address_is_link_local_unicast (address))
4529             radv_info->ref_count++;
4530
4531           ip6_neighbor_add_mld_prefix (radv_info, &a);
4532         }
4533     }
4534   else
4535     {
4536
4537       /* delete */
4538       /* look up the radv_t  information for this interface */
4539       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
4540                                sw_if_index, ~0);
4541       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
4542
4543       if (ri != ~0)
4544         {
4545           /* get radv_info */
4546           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
4547
4548           ip6_neighbor_del_mld_prefix (radv_info, &a);
4549
4550           /* if interface up send MLDP "report" */
4551           radv_info->all_routers_mcast = 0;
4552
4553           /* add address */
4554           if (!ip6_address_is_link_local_unicast (address))
4555             radv_info->ref_count--;
4556         }
4557       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
4558       disable_ip6_interface (vm, sw_if_index);
4559     }
4560 }
4561
4562 clib_error_t *
4563 ip6_set_neighbor_limit (u32 neighbor_limit)
4564 {
4565   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4566
4567   nm->limit_neighbor_cache_size = neighbor_limit;
4568   return 0;
4569 }
4570
4571 static void
4572 ip6_neighbor_table_bind (ip6_main_t * im,
4573                          uword opaque,
4574                          u32 sw_if_index,
4575                          u32 new_fib_index, u32 old_fib_index)
4576 {
4577   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4578   ip6_neighbor_t *n = NULL;
4579   u32 i, *to_re_add = 0;
4580
4581   /* *INDENT-OFF* */
4582   pool_foreach (n, nm->neighbor_pool,
4583   ({
4584     if (n->key.sw_if_index == sw_if_index)
4585       vec_add1 (to_re_add, n - nm->neighbor_pool);
4586   }));
4587   /* *INDENT-ON* */
4588
4589   for (i = 0; i < vec_len (to_re_add); i++)
4590     {
4591       n = pool_elt_at_index (nm->neighbor_pool, to_re_add[i]);
4592       ip6_neighbor_adj_fib_remove (n, old_fib_index);
4593       ip6_neighbor_adj_fib_add (n, new_fib_index);
4594     }
4595   vec_free (to_re_add);
4596 }
4597
4598 static clib_error_t *
4599 ip6_neighbor_init (vlib_main_t * vm)
4600 {
4601   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4602   ip6_main_t *im = &ip6_main;
4603
4604   mhash_init (&nm->neighbor_index_by_key,
4605               /* value size */ sizeof (uword),
4606               /* key size */ sizeof (ip6_neighbor_key_t));
4607
4608   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
4609                        ip6_icmp_neighbor_solicitation_node.index);
4610   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
4611                        ip6_icmp_neighbor_advertisement_node.index);
4612   icmp6_register_type (vm, ICMP6_router_solicitation,
4613                        ip6_icmp_router_solicitation_node.index);
4614   icmp6_register_type (vm, ICMP6_router_advertisement,
4615                        ip6_icmp_router_advertisement_node.index);
4616
4617   /* handler node for ip6 neighbor discovery events and timers */
4618   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
4619
4620   /* add call backs */
4621   ip6_add_del_interface_address_callback_t cb;
4622   clib_memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
4623
4624   /* when an interface address changes... */
4625   cb.function = ip6_neighbor_add_del_interface_address;
4626   cb.function_opaque = 0;
4627   vec_add1 (im->add_del_interface_address_callbacks, cb);
4628
4629   ip6_table_bind_callback_t cbt;
4630   cbt.function = ip6_neighbor_table_bind;
4631   cbt.function_opaque = 0;
4632   vec_add1 (im->table_bind_callbacks, cbt);
4633
4634   mhash_init (&nm->pending_resolutions_by_address,
4635               /* value size */ sizeof (uword),
4636               /* key size */ sizeof (ip6_address_t));
4637
4638   mhash_init (&nm->mac_changes_by_address,
4639               /* value size */ sizeof (uword),
4640               /* key size */ sizeof (ip6_address_t));
4641
4642   /* default, configurable */
4643   nm->limit_neighbor_cache_size = 50000;
4644
4645   nm->wc_ip6_nd_publisher_node = (uword) ~ 0;
4646
4647   nm->ip6_ra_publisher_node = (uword) ~ 0;
4648
4649 #if 0
4650   /* $$$$ Hack fix for today */
4651   vec_validate_init_empty
4652     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
4653 #endif
4654
4655   return 0;
4656 }
4657
4658 VLIB_INIT_FUNCTION (ip6_neighbor_init);
4659
4660
4661 void
4662 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
4663                                              void *address_arg,
4664                                              uword node_index,
4665                                              uword type_opaque, uword data)
4666 {
4667   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4668   ip6_address_t *address = address_arg;
4669   uword *p;
4670   pending_resolution_t *pr;
4671
4672   pool_get (nm->pending_resolutions, pr);
4673
4674   pr->next_index = ~0;
4675   pr->node_index = node_index;
4676   pr->type_opaque = type_opaque;
4677   pr->data = data;
4678
4679   p = mhash_get (&nm->pending_resolutions_by_address, address);
4680   if (p)
4681     {
4682       /* Insert new resolution at the head of the list */
4683       pr->next_index = p[0];
4684       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
4685     }
4686
4687   mhash_set (&nm->pending_resolutions_by_address, address,
4688              pr - nm->pending_resolutions, 0 /* old value */ );
4689 }
4690
4691 int
4692 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
4693                                   ip6_nd_change_event_cb_t data_callback,
4694                                   u32 pid,
4695                                   void *address_arg,
4696                                   uword node_index,
4697                                   uword type_opaque, uword data, int is_add)
4698 {
4699   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4700   ip6_address_t *address = address_arg;
4701
4702   /* Try to find an existing entry */
4703   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
4704   u32 *p = first;
4705   pending_resolution_t *mc;
4706   while (p && *p != ~0)
4707     {
4708       mc = pool_elt_at_index (nm->mac_changes, *p);
4709       if (mc->node_index == node_index && mc->type_opaque == type_opaque
4710           && mc->pid == pid)
4711         break;
4712       p = &mc->next_index;
4713     }
4714
4715   int found = p && *p != ~0;
4716   if (is_add)
4717     {
4718       if (found)
4719         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
4720
4721       pool_get (nm->mac_changes, mc);
4722       /* *INDENT-OFF* */
4723       *mc = (pending_resolution_t)
4724       {
4725         .next_index = ~0,
4726         .node_index = node_index,
4727         .type_opaque = type_opaque,
4728         .data = data,
4729         .data_callback = data_callback,
4730         .pid = pid,
4731       };
4732       /* *INDENT-ON* */
4733
4734       /* Insert new resolution at the end of the list */
4735       u32 new_idx = mc - nm->mac_changes;
4736       if (p)
4737         p[0] = new_idx;
4738       else
4739         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
4740     }
4741   else
4742     {
4743       if (!found)
4744         return VNET_API_ERROR_NO_SUCH_ENTRY;
4745
4746       /* Clients may need to clean up pool entries, too */
4747       if (data_callback)
4748         (data_callback) (mc->data, NULL /* no new mac addrs */ , 0, NULL);
4749
4750       /* Remove the entry from the list and delete the entry */
4751       *p = mc->next_index;
4752       pool_put (nm->mac_changes, mc);
4753
4754       /* Remove from hash if we deleted the last entry */
4755       if (*p == ~0 && p == first)
4756         mhash_unset (&nm->mac_changes_by_address, address, 0);
4757     }
4758   return 0;
4759 }
4760
4761 int
4762 vnet_ip6_nd_term (vlib_main_t * vm,
4763                   vlib_node_runtime_t * node,
4764                   vlib_buffer_t * p0,
4765                   ethernet_header_t * eth,
4766                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4767 {
4768   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4769   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4770   mac_address_t mac;
4771
4772   mac_address_from_bytes (&mac, eth->src_address);
4773   ndh = ip6_next_header (ip);
4774   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4775       ndh->icmp.type != ICMP6_neighbor_advertisement)
4776     return 0;
4777
4778   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4779                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4780     {
4781       u8 *t0 = vlib_add_trace (vm, node, p0,
4782                                sizeof (icmp6_input_trace_t));
4783       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4784     }
4785
4786   /* Check if anyone want ND events for L2 BDs */
4787   if (PREDICT_FALSE
4788       (nm->wc_ip6_nd_publisher_node != (uword) ~ 0
4789        && !ip6_address_is_link_local_unicast (&ip->src_address)))
4790     {
4791       vnet_nd_wc_publish (sw_if_index, &mac, &ip->src_address);
4792     }
4793
4794   /* Check if MAC entry exsist for solicited target IP */
4795   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4796     {
4797       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4798       l2_bridge_domain_t *bd_config;
4799       u8 *macp;
4800
4801       opt = (void *) (ndh + 1);
4802       if ((opt->header.type !=
4803            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4804           (opt->header.n_data_u64s != 1))
4805         return 0;               /* source link layer address option not present */
4806
4807       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4808       macp =
4809         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4810       if (macp)
4811         {                       /* found ip-mac entry, generate eighbor advertisement response */
4812           int bogus_length;
4813           vlib_node_runtime_t *error_node =
4814             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4815           ip->dst_address = ip->src_address;
4816           ip->src_address = ndh->target_address;
4817           ip->hop_limit = 255;
4818           opt->header.type =
4819             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4820           clib_memcpy (opt->ethernet_address, macp, 6);
4821           ndh->icmp.type = ICMP6_neighbor_advertisement;
4822           ndh->advertisement_flags = clib_host_to_net_u32
4823             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4824              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4825           ndh->icmp.checksum = 0;
4826           ndh->icmp.checksum =
4827             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4828           clib_memcpy (eth->dst_address, eth->src_address, 6);
4829           clib_memcpy (eth->src_address, macp, 6);
4830           vlib_error_count (vm, error_node->node_index,
4831                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4832           return 1;
4833         }
4834     }
4835
4836   return 0;
4837
4838 }
4839
4840 int
4841 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4842 {
4843   u32 fib_index;
4844
4845   fib_prefix_t pfx = {
4846     .fp_len = 128,
4847     .fp_proto = FIB_PROTOCOL_IP6,
4848     .fp_addr = {
4849                 .ip6 = *addr,
4850                 },
4851   };
4852   ip46_address_t nh = {
4853     .ip6 = *addr,
4854   };
4855
4856   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4857
4858   if (~0 == fib_index)
4859     return VNET_API_ERROR_NO_SUCH_FIB;
4860
4861   if (is_del)
4862     {
4863       fib_table_entry_path_remove (fib_index,
4864                                    &pfx,
4865                                    FIB_SOURCE_IP6_ND_PROXY,
4866                                    DPO_PROTO_IP6,
4867                                    &nh,
4868                                    sw_if_index,
4869                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4870       /* flush the ND cache of this address if it's there */
4871       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (), sw_if_index, addr);
4872     }
4873   else
4874     {
4875       fib_table_entry_path_add (fib_index,
4876                                 &pfx,
4877                                 FIB_SOURCE_IP6_ND_PROXY,
4878                                 FIB_ENTRY_FLAG_NONE,
4879                                 DPO_PROTO_IP6,
4880                                 &nh,
4881                                 sw_if_index,
4882                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4883     }
4884   return (0);
4885 }
4886
4887 static clib_error_t *
4888 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4889                       unformat_input_t * input, vlib_cli_command_t * cmd)
4890 {
4891   vnet_main_t *vnm = vnet_get_main ();
4892   clib_error_t *error = 0;
4893   ip6_address_t addr;
4894   u32 sw_if_index;
4895   u8 is_del = 0;
4896
4897   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4898     {
4899       /* get the rest of the command */
4900       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4901         {
4902           if (unformat (input, "%U", unformat_ip6_address, &addr))
4903             break;
4904           else if (unformat (input, "delete") || unformat (input, "del"))
4905             is_del = 1;
4906           else
4907             return (unformat_parse_error (input));
4908         }
4909     }
4910
4911   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4912
4913   return error;
4914 }
4915
4916 /* *INDENT-OFF* */
4917 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4918 {
4919   .path = "set ip6 nd proxy",
4920   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4921   .function = set_ip6_nd_proxy_cmd,
4922 };
4923 /* *INDENT-ON* */
4924
4925 void
4926 ethernet_ndp_change_mac (u32 sw_if_index)
4927 {
4928   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4929   ip6_neighbor_t *n;
4930   adj_index_t ai;
4931
4932   /* *INDENT-OFF* */
4933   pool_foreach (n, nm->neighbor_pool,
4934   ({
4935     if (n->key.sw_if_index == sw_if_index)
4936       {
4937         adj_nbr_walk_nh6 (sw_if_index,
4938                           &n->key.ip6_address,
4939                           ip6_nd_mk_complete_walk, n);
4940       }
4941   }));
4942   /* *INDENT-ON* */
4943
4944   ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index);
4945
4946   if (ADJ_INDEX_INVALID != ai)
4947     adj_glean_update_rewrite (ai);
4948 }
4949
4950 void
4951 send_ip6_na (vlib_main_t * vm, u32 sw_if_index)
4952 {
4953   ip6_main_t *i6m = &ip6_main;
4954   ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index);
4955
4956   send_ip6_na_w_addr (vm, ip6_addr, sw_if_index);
4957 }
4958
4959 void
4960 send_ip6_na_w_addr (vlib_main_t * vm,
4961                     const ip6_address_t * ip6_addr, u32 sw_if_index)
4962 {
4963   ip6_main_t *i6m = &ip6_main;
4964   vnet_main_t *vnm = vnet_get_main ();
4965   u8 *rewrite, rewrite_len;
4966   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
4967   u8 dst_address[6];
4968
4969   if (ip6_addr)
4970     {
4971       clib_warning
4972         ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
4973          format_ip6_address, ip6_addr, sw_if_index);
4974
4975       /* Form unsolicited neighbor advertisement packet from NS pkt template */
4976       int bogus_length;
4977       u32 bi = 0;
4978       icmp6_neighbor_solicitation_header_t *h =
4979         vlib_packet_template_get_packet (vm,
4980                                          &i6m->discover_neighbor_packet_template,
4981                                          &bi);
4982       if (!h)
4983         return;
4984
4985       ip6_set_reserved_multicast_address (&h->ip.dst_address,
4986                                           IP6_MULTICAST_SCOPE_link_local,
4987                                           IP6_MULTICAST_GROUP_ID_all_hosts);
4988       h->ip.src_address = ip6_addr[0];
4989       h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
4990       h->neighbor.target_address = ip6_addr[0];
4991       h->neighbor.advertisement_flags = clib_host_to_net_u32
4992         (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4993       h->link_layer_option.header.type =
4994         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4995       clib_memcpy (h->link_layer_option.ethernet_address,
4996                    hi->hw_address, vec_len (hi->hw_address));
4997       h->neighbor.icmp.checksum =
4998         ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
4999       ASSERT (bogus_length == 0);
5000
5001       /* Setup MAC header with IP6 Etype and mcast DMAC */
5002       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
5003       ip6_multicast_ethernet_address (dst_address,
5004                                       IP6_MULTICAST_GROUP_ID_all_hosts);
5005       rewrite =
5006         ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address);
5007       rewrite_len = vec_len (rewrite);
5008       vlib_buffer_advance (b, -rewrite_len);
5009       ethernet_header_t *e = vlib_buffer_get_current (b);
5010       clib_memcpy (e->dst_address, rewrite, rewrite_len);
5011       vec_free (rewrite);
5012
5013       /* Send unsolicited ND advertisement packet out the specified interface */
5014       vnet_buffer (b)->sw_if_index[VLIB_RX] =
5015         vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
5016       vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
5017       u32 *to_next = vlib_frame_vector_args (f);
5018       to_next[0] = bi;
5019       f->n_vectors = 1;
5020       vlib_put_frame_to_node (vm, hi->output_node_index, f);
5021     }
5022 }
5023
5024 /*
5025  * fd.io coding-style-patch-verification: ON
5026  *
5027  * Local Variables:
5028  * eval: (c-set-style "gnu")
5029  * End:
5030  */