src/vnet/ip/ip6_neighbor.c

   1 /*
   2  * ip/ip6_neighbor.c: IP6 neighbor handling
   3  *
   4  * Copyright (c) 2010 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vnet/ip/ip.h>
  19 #include <vnet/ip/ip6_neighbor.h>
  20 #include <vnet/ethernet/ethernet.h>
  21 #include <vppinfra/mhash.h>
  22 #include <vppinfra/md5.h>
  23 #include <vnet/adj/adj.h>
  24 #include <vnet/adj/adj_mcast.h>
  25 #include <vnet/fib/fib_table.h>
  26 #include <vnet/fib/ip6_fib.h>
  27 #include <vnet/mfib/ip6_mfib.h>
  28
  29 /**
  30  * @file
  31  * @brief IPv6 Neighbor Adjacency and Neighbor Discovery.
  32  *
  33  * The files contains the API and CLI code for managing IPv6 neighbor
  34  * adjacency tables and neighbor discovery logic.
  35  */
  36
  37 /* can't use sizeof link_layer_address, that's 8 */
  38 #define ETHER_MAC_ADDR_LEN 6
  39
  40 /* advertised prefix option */
  41 typedef struct
  42 {
  43   /* basic advertised information */
  44   ip6_address_t prefix;
  45   u8 prefix_len;
  46   int adv_on_link_flag;
  47   int adv_autonomous_flag;
  48   u32 adv_valid_lifetime_in_secs;
  49   u32 adv_pref_lifetime_in_secs;
  50
  51   /* advertised values are computed from these times if decrementing */
  52   f64 valid_lifetime_expires;
  53   f64 pref_lifetime_expires;
  54
  55   /* local information */
  56   int enabled;
  57   int deprecated_prefix_flag;
  58   int decrement_lifetime_flag;
  59
  60 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  61 #define DEF_ADV_VALID_LIFETIME  2592000
  62 #define DEF_ADV_PREF_LIFETIME 604800
  63
  64   /* extensions are added here, mobile, DNS etc.. */
  65 } ip6_radv_prefix_t;
  66
  67
  68 typedef struct
  69 {
  70   /* group information */
  71   u8 type;
  72   ip6_address_t mcast_address;
  73   u16 num_sources;
  74   ip6_address_t *mcast_source_address_pool;
  75 } ip6_mldp_group_t;
  76
  77 /* configured router advertisement information per ipv6 interface */
  78 typedef struct
  79 {
  80
  81   /* advertised config information, zero means unspecified  */
  82   u8 curr_hop_limit;
  83   int adv_managed_flag;
  84   int adv_other_flag;
  85   u16 adv_router_lifetime_in_sec;
  86   u32 adv_neighbor_reachable_time_in_msec;
  87   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
  88
  89   /* mtu option */
  90   u32 adv_link_mtu;
  91
  92   /* source link layer option */
  93   u8 link_layer_address[8];
  94   u8 link_layer_addr_len;
  95
  96   /* prefix option */
  97   ip6_radv_prefix_t *adv_prefixes_pool;
  98
  99   /* Hash table mapping address to index in interface advertised  prefix pool. */
 100   mhash_t address_to_prefix_index;
 101
 102   /* MLDP  group information */
 103   ip6_mldp_group_t *mldp_group_pool;
 104
 105   /* Hash table mapping address to index in mldp address pool. */
 106   mhash_t address_to_mldp_index;
 107
 108   /* local information */
 109   u32 sw_if_index;
 110   int send_radv;                /* radv on/off on this interface -  set by config */
 111   int cease_radv;               /* we are ceasing  to send  - set byf config */
 112   int send_unicast;
 113   int adv_link_layer_address;
 114   int prefix_option;
 115   int failed_device_check;
 116   int all_routers_mcast;
 117   u32 seed;
 118   u64 randomizer;
 119   int ref_count;
 120   adj_index_t mcast_adj_index;
 121
 122   /* timing information */
 123 #define DEF_MAX_RADV_INTERVAL 200
 124 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
 125 #define DEF_CURR_HOP_LIMIT  64
 126 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
 127 #define MAX_DEF_RTR_LIFETIME   9000
 128
 129 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
 130 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
 131 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
 132 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
 133 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
 134
 135   f64 max_radv_interval;
 136   f64 min_radv_interval;
 137   f64 min_delay_between_radv;
 138   f64 max_delay_between_radv;
 139   f64 max_rtr_default_lifetime;
 140
 141   f64 last_radv_time;
 142   f64 last_multicast_time;
 143   f64 next_multicast_time;
 144
 145
 146   u32 initial_adverts_count;
 147   f64 initial_adverts_interval;
 148   u32 initial_adverts_sent;
 149
 150   /* stats */
 151   u32 n_advertisements_sent;
 152   u32 n_solicitations_rcvd;
 153   u32 n_solicitations_dropped;
 154
 155   /* Link local address to use (defaults to underlying physical for logical interfaces */
 156   ip6_address_t link_local_address;
 157 } ip6_radv_t;
 158
 159 typedef struct
 160 {
 161   u32 next_index;
 162   uword node_index;
 163   uword type_opaque;
 164   uword data;
 165   /* Used for nd event notification only */
 166   void *data_callback;
 167   u32 pid;
 168 } pending_resolution_t;
 169
 170
 171 typedef struct
 172 {
 173   /* Hash tables mapping name to opcode. */
 174   uword *opcode_by_name;
 175
 176   /* lite beer "glean" adjacency handling */
 177   mhash_t pending_resolutions_by_address;
 178   pending_resolution_t *pending_resolutions;
 179
 180   /* Mac address change notification */
 181   mhash_t mac_changes_by_address;
 182   pending_resolution_t *mac_changes;
 183
 184   u32 *neighbor_input_next_index_by_hw_if_index;
 185
 186   ip6_neighbor_t *neighbor_pool;
 187
 188   mhash_t neighbor_index_by_key;
 189
 190   u32 *if_radv_pool_index_by_sw_if_index;
 191
 192   ip6_radv_t *if_radv_pool;
 193
 194   /* Neighbor attack mitigation */
 195   u32 limit_neighbor_cache_size;
 196   u32 neighbor_delete_rotor;
 197
 198 } ip6_neighbor_main_t;
 199
 200 /* ipv6 neighbor discovery - timer/event types */
 201 typedef enum
 202 {
 203   ICMP6_ND_EVENT_INIT,
 204 } ip6_icmp_neighbor_discovery_event_type_t;
 205
 206 typedef union
 207 {
 208   u32 add_del_swindex;
 209   struct
 210   {
 211     u32 up_down_swindex;
 212     u32 fib_index;
 213   } up_down_event;
 214 } ip6_icmp_neighbor_discovery_event_data_t;
 215
 216 static ip6_neighbor_main_t ip6_neighbor_main;
 217 static ip6_address_t ip6a_zero; /* ip6 address 0 */
 218
 219 static u8 *
 220 format_ip6_neighbor_ip6_entry (u8 * s, va_list * va)
 221 {
 222   vlib_main_t *vm = va_arg (*va, vlib_main_t *);
 223   ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *);
 224   vnet_main_t *vnm = vnet_get_main ();
 225   vnet_sw_interface_t *si;
 226   u8 *flags = 0;
 227
 228   if (!n)
 229     return format (s, "%=12s%=20s%=6s%=20s%=40s", "Time", "Address", "Flags",
 230                    "Link layer", "Interface");
 231
 232   if (n->flags & IP6_NEIGHBOR_FLAG_DYNAMIC)
 233     flags = format (flags, "D");
 234
 235   if (n->flags & IP6_NEIGHBOR_FLAG_STATIC)
 236     flags = format (flags, "S");
 237
 238   if (n->flags & IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY)
 239     flags = format (flags, "N");
 240
 241   si = vnet_get_sw_interface (vnm, n->key.sw_if_index);
 242   s = format (s, "%=12U%=20U%=6s%=20U%=40U",
 243               format_vlib_cpu_time, vm, n->cpu_time_last_updated,
 244               format_ip6_address, &n->key.ip6_address,
 245               flags ? (char *) flags : "",
 246               format_ethernet_address, n->link_layer_address,
 247               format_vnet_sw_interface_name, vnm, si);
 248
 249   vec_free (flags);
 250   return s;
 251 }
 252
 253 static clib_error_t *
 254 ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
 255                                    u32 sw_if_index, u32 flags)
 256 {
 257   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 258   ip6_neighbor_t *n;
 259
 260   if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 261     {
 262       u32 i, *to_delete = 0;
 263
 264       /* *INDENT-OFF* */
 265       pool_foreach (n, nm->neighbor_pool,
 266       ({
 267         if (n->key.sw_if_index == sw_if_index)
 268           vec_add1 (to_delete, n - nm->neighbor_pool);
 269       }));
 270       /* *INDENT-ON* */
 271
 272       for (i = 0; i < vec_len (to_delete); i++)
 273         {
 274           n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
 275           mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 276           if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 277             {
 278               fib_prefix_t pfx = {
 279                 .fp_len = 128,
 280                 .fp_proto = FIB_PROTOCOL_IP6,
 281                 .fp_addr.ip6 = n->key.ip6_address,
 282               };
 283               fib_table_entry_path_remove
 284                 (ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index),
 285                  &pfx,
 286                  FIB_SOURCE_ADJ,
 287                  FIB_PROTOCOL_IP6,
 288                  &pfx.fp_addr,
 289                  n->key.sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
 290               pool_put (nm->neighbor_pool, n);
 291             }
 292         }
 293       vec_free (to_delete);
 294     }
 295
 296   return 0;
 297 }
 298
 299 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down);
 300
 301 static void
 302 unset_random_neighbor_entry (void)
 303 {
 304   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 305   vnet_main_t *vnm = vnet_get_main ();
 306   vlib_main_t *vm = vnm->vlib_main;
 307   ip6_neighbor_t *e;
 308   u32 index;
 309
 310   index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 311   nm->neighbor_delete_rotor = index;
 312
 313   /* Try again from elt 0, could happen if an intfc goes down */
 314   if (index == ~0)
 315     {
 316       index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor);
 317       nm->neighbor_delete_rotor = index;
 318     }
 319
 320   /* Nothing left in the pool */
 321   if (index == ~0)
 322     return;
 323
 324   e = pool_elt_at_index (nm->neighbor_pool, index);
 325
 326   vnet_unset_ip6_ethernet_neighbor (vm, e->key.sw_if_index,
 327                                     &e->key.ip6_address,
 328                                     e->link_layer_address,
 329                                     ETHER_MAC_ADDR_LEN);
 330 }
 331
 332 typedef struct
 333 {
 334   u8 is_add;
 335   u8 is_static;
 336   u8 is_no_fib_entry;
 337   u8 link_layer_address[6];
 338   u32 sw_if_index;
 339   ip6_address_t addr;
 340 } ip6_neighbor_set_unset_rpc_args_t;
 341
 342 static void ip6_neighbor_set_unset_rpc_callback
 343   (ip6_neighbor_set_unset_rpc_args_t * a);
 344
 345 static void set_unset_ip6_neighbor_rpc
 346   (vlib_main_t * vm,
 347    u32 sw_if_index,
 348    ip6_address_t * a, u8 * link_layer_address, int is_add, int is_static,
 349    int is_no_fib_entry)
 350 {
 351   ip6_neighbor_set_unset_rpc_args_t args;
 352   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
 353
 354   args.sw_if_index = sw_if_index;
 355   args.is_add = is_add;
 356   args.is_static = is_static;
 357   args.is_no_fib_entry = is_no_fib_entry;
 358   clib_memcpy (&args.addr, a, sizeof (*a));
 359   if (NULL != link_layer_address)
 360     clib_memcpy (args.link_layer_address, link_layer_address, 6);
 361
 362   vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback,
 363                                (u8 *) & args, sizeof (args));
 364 }
 365
 366 static void
 367 ip6_nbr_probe (ip_adjacency_t * adj)
 368 {
 369   icmp6_neighbor_solicitation_header_t *h;
 370   vnet_main_t *vnm = vnet_get_main ();
 371   ip6_main_t *im = &ip6_main;
 372   ip_interface_address_t *ia;
 373   ip6_address_t *dst, *src;
 374   vnet_hw_interface_t *hi;
 375   vnet_sw_interface_t *si;
 376   vlib_buffer_t *b;
 377   int bogus_length;
 378   vlib_main_t *vm;
 379   u32 bi = 0;
 380
 381   vm = vlib_get_main ();
 382
 383   si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
 384   dst = &adj->sub_type.nbr.next_hop.ip6;
 385
 386   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
 387     {
 388       return;
 389     }
 390   src = ip6_interface_address_matching_destination (im, dst,
 391                                                     adj->rewrite_header.
 392                                                     sw_if_index, &ia);
 393   if (!src)
 394     {
 395       return;
 396     }
 397
 398   h = vlib_packet_template_get_packet (vm,
 399                                        &im->discover_neighbor_packet_template,
 400                                        &bi);
 401
 402   hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
 403
 404   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
 405   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
 406   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
 407   h->ip.src_address = src[0];
 408   h->neighbor.target_address = dst[0];
 409
 410   clib_memcpy (h->link_layer_option.ethernet_address,
 411                hi->hw_address, vec_len (hi->hw_address));
 412
 413   h->neighbor.icmp.checksum =
 414     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
 415   ASSERT (bogus_length == 0);
 416
 417   b = vlib_get_buffer (vm, bi);
 418   vnet_buffer (b)->sw_if_index[VLIB_RX] =
 419     vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
 420
 421   /* Add encapsulation string for software interface (e.g. ethernet header). */
 422   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
 423   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
 424
 425   {
 426     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
 427     u32 *to_next = vlib_frame_vector_args (f);
 428     to_next[0] = bi;
 429     f->n_vectors = 1;
 430     vlib_put_frame_to_node (vm, hi->output_node_index, f);
 431   }
 432 }
 433
 434 static void
 435 ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr)
 436 {
 437   adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
 438                           ethernet_build_rewrite (vnet_get_main (),
 439                                                   nbr->key.sw_if_index,
 440                                                   adj_get_link_type (ai),
 441                                                   nbr->link_layer_address));
 442 }
 443
 444 static void
 445 ip6_nd_mk_incomplete (adj_index_t ai)
 446 {
 447   ip_adjacency_t *adj = adj_get (ai);
 448
 449   adj_nbr_update_rewrite (ai,
 450                           ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 451                           ethernet_build_rewrite (vnet_get_main (),
 452                                                   adj->rewrite_header.
 453                                                   sw_if_index,
 454                                                   adj_get_link_type (ai),
 455                                                   VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 456 }
 457
 458 #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \
 459 {                                            \
 460     k.sw_if_index = sw_if_index;             \
 461     k.ip6_address = *addr;                   \
 462     k.pad = 0;                               \
 463 }
 464
 465 static ip6_neighbor_t *
 466 ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr)
 467 {
 468   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 469   ip6_neighbor_t *n = NULL;
 470   ip6_neighbor_key_t k;
 471   uword *p;
 472
 473   IP6_NBR_MK_KEY (k, sw_if_index, addr);
 474
 475   p = mhash_get (&nm->neighbor_index_by_key, &k);
 476   if (p)
 477     {
 478       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 479     }
 480
 481   return (n);
 482 }
 483
 484 static adj_walk_rc_t
 485 ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx)
 486 {
 487   ip6_neighbor_t *nbr = ctx;
 488
 489   ip6_nd_mk_complete (ai, nbr);
 490
 491   return (ADJ_WALK_RC_CONTINUE);
 492 }
 493
 494 static adj_walk_rc_t
 495 ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx)
 496 {
 497   ip6_nd_mk_incomplete (ai);
 498
 499   return (ADJ_WALK_RC_CONTINUE);
 500 }
 501
 502 void
 503 ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 504 {
 505   ip6_neighbor_t *nbr;
 506   ip_adjacency_t *adj;
 507
 508   adj = adj_get (ai);
 509
 510   nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6);
 511
 512   switch (adj->lookup_next_index)
 513     {
 514     case IP_LOOKUP_NEXT_ARP:
 515     case IP_LOOKUP_NEXT_GLEAN:
 516       if (NULL != nbr)
 517         {
 518           adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
 519                             ip6_nd_mk_complete_walk, nbr);
 520         }
 521       else
 522         {
 523           /*
 524            * no matching ND entry.
 525            * construct the rewrite required to for an ND packet, and stick
 526            * that in the adj's pipe to smoke.
 527            */
 528           adj_nbr_update_rewrite (ai,
 529                                   ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
 530                                   ethernet_build_rewrite (vnm,
 531                                                           sw_if_index,
 532                                                           VNET_LINK_IP6,
 533                                                           VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
 534
 535           /*
 536            * since the FIB has added this adj for a route, it makes sense it may
 537            * want to forward traffic sometime soon. Let's send a speculative ND.
 538            * just one. If we were to do periodically that wouldn't be bad either,
 539            * but that's more code than i'm prepared to write at this time for
 540            * relatively little reward.
 541            */
 542           ip6_nbr_probe (adj);
 543         }
 544       break;
 545     case IP_LOOKUP_NEXT_MCAST:
 546       {
 547         /*
 548          * Construct a partial rewrite from the known ethernet mcast dest MAC
 549          */
 550         u8 *rewrite;
 551         u8 offset;
 552
 553         rewrite = ethernet_build_rewrite (vnm,
 554                                           sw_if_index,
 555                                           adj->ia_link,
 556                                           ethernet_ip6_mcast_dst_addr ());
 557
 558         /*
 559          * Complete the remaining fields of the adj's rewrite to direct the
 560          * complete of the rewrite at switch time by copying in the IP
 561          * dst address's bytes.
 562          * Ofset is 2 bytes into the desintation address. And we write 4 bytes.
 563          */
 564         offset = vec_len (rewrite) - 2;
 565         adj_mcast_update_rewrite (ai, rewrite, offset, 0xffffffff);
 566
 567         break;
 568       }
 569     case IP_LOOKUP_NEXT_DROP:
 570     case IP_LOOKUP_NEXT_PUNT:
 571     case IP_LOOKUP_NEXT_LOCAL:
 572     case IP_LOOKUP_NEXT_REWRITE:
 573     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
 574     case IP_LOOKUP_NEXT_MIDCHAIN:
 575     case IP_LOOKUP_NEXT_ICMP_ERROR:
 576     case IP_LOOKUP_N_NEXT:
 577       ASSERT (0);
 578       break;
 579     }
 580 }
 581
 582 int
 583 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 584                                 u32 sw_if_index,
 585                                 ip6_address_t * a,
 586                                 u8 * link_layer_address,
 587                                 uword n_bytes_link_layer_address,
 588                                 int is_static, int is_no_fib_entry)
 589 {
 590   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 591   ip6_neighbor_key_t k;
 592   ip6_neighbor_t *n = 0;
 593   int make_new_nd_cache_entry = 1;
 594   uword *p;
 595   u32 next_index;
 596   pending_resolution_t *pr, *mc;
 597
 598   if (vlib_get_thread_index ())
 599     {
 600       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, link_layer_address,
 601                                   1 /* set new neighbor */ , is_static,
 602                                   is_no_fib_entry);
 603       return 0;
 604     }
 605
 606   k.sw_if_index = sw_if_index;
 607   k.ip6_address = a[0];
 608   k.pad = 0;
 609
 610   p = mhash_get (&nm->neighbor_index_by_key, &k);
 611   if (p)
 612     {
 613       n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 614       /* Refuse to over-write static neighbor entry. */
 615       if (!is_static && (n->flags & IP6_NEIGHBOR_FLAG_STATIC))
 616         return -2;
 617       make_new_nd_cache_entry = 0;
 618     }
 619
 620   if (make_new_nd_cache_entry)
 621     {
 622       pool_get (nm->neighbor_pool, n);
 623       mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
 624                  /* old value */ 0);
 625       n->key = k;
 626       n->fib_entry_index = FIB_NODE_INDEX_INVALID;
 627
 628       clib_memcpy (n->link_layer_address,
 629                    link_layer_address, n_bytes_link_layer_address);
 630
 631       /*
 632        * create the adj-fib. the entry in the FIB table for and to the peer.
 633        */
 634       if (!is_no_fib_entry)
 635         {
 636           fib_prefix_t pfx = {
 637             .fp_len = 128,
 638             .fp_proto = FIB_PROTOCOL_IP6,
 639             .fp_addr.ip6 = k.ip6_address,
 640           };
 641           u32 fib_index;
 642
 643           fib_index =
 644             ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index);
 645           n->fib_entry_index =
 646             fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
 647                                       FIB_ENTRY_FLAG_ATTACHED,
 648                                       FIB_PROTOCOL_IP6, &pfx.fp_addr,
 649                                       n->key.sw_if_index, ~0, 1, NULL,
 650                                       FIB_ROUTE_PATH_FLAG_NONE);
 651         }
 652       else
 653         {
 654           n->flags |= IP6_NEIGHBOR_FLAG_NO_FIB_ENTRY;
 655         }
 656     }
 657   else
 658     {
 659       /*
 660        * prevent a DoS attack from the data-plane that
 661        * spams us with no-op updates to the MAC address
 662        */
 663       if (0 == memcmp (n->link_layer_address,
 664                        link_layer_address, n_bytes_link_layer_address))
 665         return -1;
 666
 667       clib_memcpy (n->link_layer_address,
 668                    link_layer_address, n_bytes_link_layer_address);
 669     }
 670
 671   /* Update time stamp and flags. */
 672   n->cpu_time_last_updated = clib_cpu_time_now ();
 673   if (is_static)
 674     n->flags |= IP6_NEIGHBOR_FLAG_STATIC;
 675   else
 676     n->flags |= IP6_NEIGHBOR_FLAG_DYNAMIC;
 677
 678   adj_nbr_walk_nh6 (sw_if_index,
 679                     &n->key.ip6_address, ip6_nd_mk_complete_walk, n);
 680
 681   /* Customer(s) waiting for this address to be resolved? */
 682   p = mhash_get (&nm->pending_resolutions_by_address, a);
 683   if (p)
 684     {
 685       next_index = p[0];
 686
 687       while (next_index != (u32) ~ 0)
 688         {
 689           pr = pool_elt_at_index (nm->pending_resolutions, next_index);
 690           vlib_process_signal_event (vm, pr->node_index,
 691                                      pr->type_opaque, pr->data);
 692           next_index = pr->next_index;
 693           pool_put (nm->pending_resolutions, pr);
 694         }
 695
 696       mhash_unset (&nm->pending_resolutions_by_address, a, 0);
 697     }
 698
 699   /* Customer(s) requesting ND event for this address? */
 700   p = mhash_get (&nm->mac_changes_by_address, a);
 701   if (p)
 702     {
 703       next_index = p[0];
 704
 705       while (next_index != (u32) ~ 0)
 706         {
 707           int (*fp) (u32, u8 *, u32, ip6_address_t *);
 708           int rv = 1;
 709           mc = pool_elt_at_index (nm->mac_changes, next_index);
 710           fp = mc->data_callback;
 711
 712           /* Call the user's data callback, return 1 to suppress dup events */
 713           if (fp)
 714             rv =
 715               (*fp) (mc->data, link_layer_address, sw_if_index, &ip6a_zero);
 716           /*
 717            * Signal the resolver process, as long as the user
 718            * says they want to be notified
 719            */
 720           if (rv == 0)
 721             vlib_process_signal_event (vm, mc->node_index,
 722                                        mc->type_opaque, mc->data);
 723           next_index = mc->next_index;
 724         }
 725     }
 726
 727   return 0;
 728 }
 729
 730 int
 731 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 732                                   u32 sw_if_index,
 733                                   ip6_address_t * a,
 734                                   u8 * link_layer_address,
 735                                   uword n_bytes_link_layer_address)
 736 {
 737   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 738   ip6_neighbor_key_t k;
 739   ip6_neighbor_t *n;
 740   uword *p;
 741   int rv = 0;
 742
 743   if (vlib_get_thread_index ())
 744     {
 745       set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, link_layer_address,
 746                                   0 /* unset */ , 0, 0);
 747       return 0;
 748     }
 749
 750   k.sw_if_index = sw_if_index;
 751   k.ip6_address = a[0];
 752   k.pad = 0;
 753
 754   p = mhash_get (&nm->neighbor_index_by_key, &k);
 755   if (p == 0)
 756     {
 757       rv = -1;
 758       goto out;
 759     }
 760
 761   n = pool_elt_at_index (nm->neighbor_pool, p[0]);
 762   mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
 763
 764   adj_nbr_walk_nh6 (sw_if_index,
 765                     &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
 766
 767
 768   if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
 769     {
 770       fib_prefix_t pfx = {
 771         .fp_len = 128,
 772         .fp_proto = FIB_PROTOCOL_IP6,
 773         .fp_addr.ip6 = n->key.ip6_address,
 774       };
 775       fib_table_entry_path_remove
 776         (ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index),
 777          &pfx,
 778          FIB_SOURCE_ADJ,
 779          FIB_PROTOCOL_IP6,
 780          &pfx.fp_addr, n->key.sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
 781     }
 782   pool_put (nm->neighbor_pool, n);
 783
 784 out:
 785   return rv;
 786 }
 787
 788 static void ip6_neighbor_set_unset_rpc_callback
 789   (ip6_neighbor_set_unset_rpc_args_t * a)
 790 {
 791   vlib_main_t *vm = vlib_get_main ();
 792   if (a->is_add)
 793     vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 794                                     a->link_layer_address, 6, a->is_static,
 795                                     a->is_no_fib_entry);
 796   else
 797     vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr,
 798                                       a->link_layer_address, 6);
 799 }
 800
 801 static int
 802 ip6_neighbor_sort (void *a1, void *a2)
 803 {
 804   vnet_main_t *vnm = vnet_get_main ();
 805   ip6_neighbor_t *n1 = a1, *n2 = a2;
 806   int cmp;
 807   cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index,
 808                                    n2->key.sw_if_index);
 809   if (!cmp)
 810     cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address);
 811   return cmp;
 812 }
 813
 814 ip6_neighbor_t *
 815 ip6_neighbors_entries (u32 sw_if_index)
 816 {
 817   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
 818   ip6_neighbor_t *n, *ns = 0;
 819
 820   /* *INDENT-OFF* */
 821   pool_foreach (n, nm->neighbor_pool,
 822   ({
 823     if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index)
 824       continue;
 825     vec_add1 (ns, n[0]);
 826   }));
 827   /* *INDENT-ON* */
 828
 829   if (ns)
 830     vec_sort_with_function (ns, ip6_neighbor_sort);
 831   return ns;
 832 }
 833
 834 static clib_error_t *
 835 show_ip6_neighbors (vlib_main_t * vm,
 836                     unformat_input_t * input, vlib_cli_command_t * cmd)
 837 {
 838   vnet_main_t *vnm = vnet_get_main ();
 839   ip6_neighbor_t *n, *ns;
 840   clib_error_t *error = 0;
 841   u32 sw_if_index;
 842
 843   /* Filter entries by interface if given. */
 844   sw_if_index = ~0;
 845   (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
 846
 847   ns = ip6_neighbors_entries (sw_if_index);
 848   if (ns)
 849     {
 850       vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0);
 851       vec_foreach (n, ns)
 852       {
 853         vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n);
 854       }
 855       vec_free (ns);
 856     }
 857
 858   return error;
 859 }
 860
 861 /*?
 862  * This command is used to display the adjacent IPv6 hosts found via
 863  * neighbor discovery. Optionally, limit the output to the specified
 864  * interface.
 865  *
 866  * @cliexpar
 867  * Example of how to display the IPv6 neighbor adjacency table:
 868  * @cliexstart{show ip6 neighbors}
 869  *     Time           Address       Flags     Link layer                     Interface
 870  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
 871  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
 872  *     886.6654     ::1:1:c:0:9       S    02:fe:e4:45:27:5b                GigabitEthernet3/0/0
 873  * @cliexend
 874  * Example of how to display the IPv6 neighbor adjacency table for given interface:
 875  * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0}
 876  *     Time           Address       Flags     Link layer                     Interface
 877  *      34.0910     ::a:1:1:0:7            02:fe:6a:07:39:6f                GigabitEthernet2/0/0
 878  *     173.2916     ::b:5:1:c:2            02:fe:50:62:3a:94                GigabitEthernet2/0/0
 879  * @cliexend
 880 ?*/
 881 /* *INDENT-OFF* */
 882 VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = {
 883   .path = "show ip6 neighbors",
 884   .function = show_ip6_neighbors,
 885   .short_help = "show ip6 neighbors [<interface>]",
 886 };
 887 /* *INDENT-ON* */
 888
 889 static clib_error_t *
 890 set_ip6_neighbor (vlib_main_t * vm,
 891                   unformat_input_t * input, vlib_cli_command_t * cmd)
 892 {
 893   vnet_main_t *vnm = vnet_get_main ();
 894   ip6_address_t addr;
 895   u8 mac_address[6];
 896   int addr_valid = 0;
 897   int is_del = 0;
 898   int is_static = 0;
 899   int is_no_fib_entry = 0;
 900   u32 sw_if_index;
 901
 902   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 903     {
 904       /* intfc, ip6-address, mac-address */
 905       if (unformat (input, "%U %U %U",
 906                     unformat_vnet_sw_interface, vnm, &sw_if_index,
 907                     unformat_ip6_address, &addr,
 908                     unformat_ethernet_address, mac_address))
 909         addr_valid = 1;
 910
 911       else if (unformat (input, "delete") || unformat (input, "del"))
 912         is_del = 1;
 913       else if (unformat (input, "static"))
 914         is_static = 1;
 915       else if (unformat (input, "no-fib-entry"))
 916         is_no_fib_entry = 1;
 917       else
 918         break;
 919     }
 920
 921   if (!addr_valid)
 922     return clib_error_return (0, "Missing interface, ip6 or hw address");
 923
 924   if (!is_del)
 925     vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr,
 926                                     mac_address, sizeof (mac_address),
 927                                     is_static, is_no_fib_entry);
 928   else
 929     vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr,
 930                                       mac_address, sizeof (mac_address));
 931   return 0;
 932 }
 933
 934 /*?
 935  * This command is used to manually add an entry to the IPv6 neighbor
 936  * adjacency table. Optionally, the entry can be added as static. It is
 937  * also used to remove an entry from the table. Use the '<em>show ip6
 938  * neighbors</em>' command to display all learned and manually entered entries.
 939  *
 940  * @cliexpar
 941  * Example of how to add a static entry to the IPv6 neighbor adjacency table:
 942  * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static}
 943  * Example of how to delete an entry from the IPv6 neighbor adjacency table:
 944  * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b}
 945 ?*/
 946 /* *INDENT-OFF* */
 947 VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) =
 948 {
 949   .path = "set ip6 neighbor",
 950   .function = set_ip6_neighbor,
 951   .short_help = "set ip6 neighbor [del] <interface> <ip6-address> <mac-address> [static]",
 952 };
 953 /* *INDENT-ON* */
 954
 955 typedef enum
 956 {
 957   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
 958   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
 959   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
 960 } icmp6_neighbor_solicitation_or_advertisement_next_t;
 961
 962 static_always_inline uword
 963 icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm,
 964                                               vlib_node_runtime_t * node,
 965                                               vlib_frame_t * frame,
 966                                               uword is_solicitation)
 967 {
 968   vnet_main_t *vnm = vnet_get_main ();
 969   ip6_main_t *im = &ip6_main;
 970   uword n_packets = frame->n_vectors;
 971   u32 *from, *to_next;
 972   u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent;
 973   icmp6_neighbor_discovery_option_type_t option_type;
 974   vlib_node_runtime_t *error_node =
 975     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
 976   int bogus_length;
 977
 978   from = vlib_frame_vector_args (frame);
 979   n_left_from = n_packets;
 980   next_index = node->cached_next_index;
 981
 982   if (node->flags & VLIB_NODE_FLAG_TRACE)
 983     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
 984                                    /* stride */ 1,
 985                                    sizeof (icmp6_input_trace_t));
 986
 987   option_type =
 988     (is_solicitation
 989      ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address
 990      : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address);
 991   n_advertisements_sent = 0;
 992
 993   while (n_left_from > 0)
 994     {
 995       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 996
 997       while (n_left_from > 0 && n_left_to_next > 0)
 998         {
 999           vlib_buffer_t *p0;
1000           ip6_header_t *ip0;
1001           icmp6_neighbor_solicitation_or_advertisement_header_t *h0;
1002           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1003           u32 bi0, options_len0, sw_if_index0, next0, error0;
1004           u32 ip6_sadd_link_local, ip6_sadd_unspecified;
1005           int is_rewrite0;
1006           u32 ni0;
1007
1008           bi0 = to_next[0] = from[0];
1009
1010           from += 1;
1011           to_next += 1;
1012           n_left_from -= 1;
1013           n_left_to_next -= 1;
1014
1015           p0 = vlib_get_buffer (vm, bi0);
1016           ip0 = vlib_buffer_get_current (p0);
1017           h0 = ip6_next_header (ip0);
1018           options_len0 =
1019             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1020
1021           error0 = ICMP6_ERROR_NONE;
1022           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1023           ip6_sadd_link_local =
1024             ip6_address_is_link_local_unicast (&ip0->src_address);
1025           ip6_sadd_unspecified =
1026             ip6_address_is_unspecified (&ip0->src_address);
1027
1028           /* Check that source address is unspecified, link-local or else on-link. */
1029           if (!ip6_sadd_unspecified && !ip6_sadd_link_local)
1030             {
1031               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1032
1033               if (ADJ_INDEX_INVALID != src_adj_index0)
1034                 {
1035                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1036
1037                   /* Allow all realistic-looking rewrite adjacencies to pass */
1038                   ni0 = adj0->lookup_next_index;
1039                   is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) &&
1040                     (ni0 < IP6_LOOKUP_N_NEXT);
1041
1042                   error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0
1043                              || !is_rewrite0)
1044                             ?
1045                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK
1046                             : error0);
1047                 }
1048               else
1049                 {
1050                   error0 =
1051                     ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK;
1052                 }
1053             }
1054
1055           o0 = (void *) (h0 + 1);
1056           o0 = ((options_len0 == 8 && o0->header.type == option_type
1057                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1058
1059           /* If src address unspecified or link local, donot learn neighbor MAC */
1060           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1061                             !ip6_sadd_unspecified))
1062             {
1063               ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1064               if (nm->limit_neighbor_cache_size &&
1065                   pool_elts (nm->neighbor_pool) >=
1066                   nm->limit_neighbor_cache_size)
1067                 unset_random_neighbor_entry ();
1068               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1069                                               is_solicitation ?
1070                                               &ip0->src_address :
1071                                               &h0->target_address,
1072                                               o0->ethernet_address,
1073                                               sizeof (o0->ethernet_address),
1074                                               0, ip6_sadd_link_local);
1075             }
1076
1077           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1078             {
1079               /* Check that target address is local to this router. */
1080               fib_node_index_t fei;
1081               u32 fib_index;
1082
1083               fib_index =
1084                 ip6_fib_table_get_index_for_sw_if_index (sw_if_index0);
1085
1086               if (~0 == fib_index)
1087                 {
1088                   error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1089                 }
1090               else
1091                 {
1092                   fei = ip6_fib_table_lookup_exact_match (fib_index,
1093                                                           &h0->target_address,
1094                                                           128);
1095
1096                   if (FIB_NODE_INDEX_INVALID == fei)
1097                     {
1098                       /* The target address is not in the FIB */
1099                       error0 =
1100                         ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1101                     }
1102                   else
1103                     {
1104                       if (FIB_ENTRY_FLAG_LOCAL &
1105                           fib_entry_get_flags_for_source (fei,
1106                                                           FIB_SOURCE_INTERFACE))
1107                         {
1108                           /* It's an address that belongs to one of our interfaces
1109                            * that's good. */
1110                         }
1111                       else
1112                         if (fib_entry_is_sourced
1113                             (fei, FIB_SOURCE_IP6_ND_PROXY))
1114                         {
1115                           /* The address was added by IPv6 Proxy ND config.
1116                            * We should only respond to these if the NS arrived on
1117                            * the link that has a matching covering prefix */
1118                         }
1119                       else
1120                         {
1121                           error0 =
1122                             ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN;
1123                         }
1124                     }
1125                 }
1126             }
1127
1128           if (is_solicitation)
1129             next0 = (error0 != ICMP6_ERROR_NONE
1130                      ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP
1131                      : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY);
1132           else
1133             {
1134               next0 = 0;
1135               error0 = error0 == ICMP6_ERROR_NONE ?
1136                 ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0;
1137             }
1138
1139           if (is_solicitation && error0 == ICMP6_ERROR_NONE)
1140             {
1141               vnet_sw_interface_t *sw_if0;
1142               ethernet_interface_t *eth_if0;
1143               ethernet_header_t *eth0;
1144
1145               /* dst address is either source address or the all-nodes mcast addr */
1146               if (!ip6_sadd_unspecified)
1147                 ip0->dst_address = ip0->src_address;
1148               else
1149                 ip6_set_reserved_multicast_address (&ip0->dst_address,
1150                                                     IP6_MULTICAST_SCOPE_link_local,
1151                                                     IP6_MULTICAST_GROUP_ID_all_hosts);
1152
1153               ip0->src_address = h0->target_address;
1154               ip0->hop_limit = 255;
1155               h0->icmp.type = ICMP6_neighbor_advertisement;
1156
1157               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1158               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1159               eth_if0 =
1160                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1161               if (eth_if0 && o0)
1162                 {
1163                   clib_memcpy (o0->ethernet_address, eth_if0->address, 6);
1164                   o0->header.type =
1165                     ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
1166                 }
1167
1168               h0->advertisement_flags = clib_host_to_net_u32
1169                 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
1170                  | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
1171
1172               h0->icmp.checksum = 0;
1173               h0->icmp.checksum =
1174                 ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1175                                                    &bogus_length);
1176               ASSERT (bogus_length == 0);
1177
1178               /* Reuse current MAC header, copy SMAC to DMAC and
1179                * interface MAC to SMAC */
1180               vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0));
1181               eth0 = vlib_buffer_get_current (p0);
1182               clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1183               if (eth_if0)
1184                 clib_memcpy (eth0->src_address, eth_if0->address, 6);
1185
1186               /* Setup input and output sw_if_index for packet */
1187               ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0);
1188               vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1189               vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1190                 vnet_main.local_interface_sw_if_index;
1191
1192               n_advertisements_sent++;
1193             }
1194
1195           p0->error = error_node->errors[error0];
1196
1197           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1198                                            to_next, n_left_to_next,
1199                                            bi0, next0);
1200         }
1201
1202       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1203     }
1204
1205   /* Account for advertisements sent. */
1206   vlib_error_count (vm, error_node->node_index,
1207                     ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX,
1208                     n_advertisements_sent);
1209
1210   return frame->n_vectors;
1211 }
1212
1213 /* for "syslogging" - use elog for now */
1214 #define foreach_log_level            \
1215   _ (DEBUG, "DEBUG")                         \
1216   _ (INFO, "INFORMATION")            \
1217   _ (NOTICE, "NOTICE")               \
1218   _ (WARNING, "WARNING")             \
1219   _ (ERR, "ERROR")                                    \
1220   _ (CRIT, "CRITICAL")                        \
1221   _ (ALERT, "ALERT")                          \
1222   _ (EMERG,  "EMERGENCY")
1223
1224 typedef enum
1225 {
1226 #define _(f,s) LOG_##f,
1227   foreach_log_level
1228 #undef _
1229 } log_level_t;
1230
1231 static char *log_level_strings[] = {
1232 #define _(f,s) s,
1233   foreach_log_level
1234 #undef _
1235 };
1236
1237 static int logmask = 1 << LOG_DEBUG;
1238
1239 static void
1240 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
1241 {
1242   /* just use elog for now */
1243   u8 *what;
1244   va_list va;
1245
1246   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
1247     return;
1248
1249   va_start (va, fmt);
1250   if (fmt)
1251     {
1252       what = va_format (0, fmt, &va);
1253
1254       ELOG_TYPE_DECLARE (e) =
1255       {
1256       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
1257       struct
1258       {
1259         u32 s[2];
1260       } *ed;
1261       ed = ELOG_DATA (&vm->elog_main, e);
1262       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
1263       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
1264     }
1265   va_end (va);
1266   return;
1267 }
1268
1269 /* ipv6 neighbor discovery - router advertisements */
1270 typedef enum
1271 {
1272   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
1273   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
1274   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
1275   ICMP6_ROUTER_SOLICITATION_N_NEXT,
1276 } icmp6_router_solicitation_or_advertisement_next_t;
1277
1278 static_always_inline uword
1279 icmp6_router_solicitation (vlib_main_t * vm,
1280                            vlib_node_runtime_t * node, vlib_frame_t * frame)
1281 {
1282   vnet_main_t *vnm = vnet_get_main ();
1283   ip6_main_t *im = &ip6_main;
1284   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1285   uword n_packets = frame->n_vectors;
1286   u32 *from, *to_next;
1287   u32 n_left_from, n_left_to_next, next_index;
1288   u32 n_advertisements_sent = 0;
1289   int bogus_length;
1290
1291   icmp6_neighbor_discovery_option_type_t option_type;
1292
1293   vlib_node_runtime_t *error_node =
1294     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1295
1296   from = vlib_frame_vector_args (frame);
1297   n_left_from = n_packets;
1298   next_index = node->cached_next_index;
1299
1300   if (node->flags & VLIB_NODE_FLAG_TRACE)
1301     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1302                                    /* stride */ 1,
1303                                    sizeof (icmp6_input_trace_t));
1304
1305   /* source may append his LL address */
1306   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1307
1308   while (n_left_from > 0)
1309     {
1310       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1311
1312       while (n_left_from > 0 && n_left_to_next > 0)
1313         {
1314           vlib_buffer_t *p0;
1315           ip6_header_t *ip0;
1316           ip6_radv_t *radv_info = 0;
1317
1318           icmp6_neighbor_discovery_header_t *h0;
1319           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
1320
1321           u32 bi0, options_len0, sw_if_index0, next0, error0;
1322           u32 is_solicitation = 1, is_dropped = 0;
1323           u32 is_unspecified, is_link_local;
1324
1325           bi0 = to_next[0] = from[0];
1326
1327           from += 1;
1328           to_next += 1;
1329           n_left_from -= 1;
1330           n_left_to_next -= 1;
1331
1332           p0 = vlib_get_buffer (vm, bi0);
1333           ip0 = vlib_buffer_get_current (p0);
1334           h0 = ip6_next_header (ip0);
1335           options_len0 =
1336             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1337           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
1338           is_link_local =
1339             ip6_address_is_link_local_unicast (&ip0->src_address);
1340
1341           error0 = ICMP6_ERROR_NONE;
1342           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1343
1344           /* check if solicitation  (not from nd_timer node) */
1345           if (ip6_address_is_unspecified (&ip0->dst_address))
1346             is_solicitation = 0;
1347
1348           /* Check that source address is unspecified, link-local or else on-link. */
1349           if (!is_unspecified && !is_link_local)
1350             {
1351               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1352
1353               if (ADJ_INDEX_INVALID != src_adj_index0)
1354                 {
1355                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
1356
1357                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
1358                             ?
1359                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
1360                             : error0);
1361                 }
1362               else
1363                 {
1364                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
1365                 }
1366             }
1367
1368           /* check for source LL option and process */
1369           o0 = (void *) (h0 + 1);
1370           o0 = ((options_len0 == 8
1371                  && o0->header.type == option_type
1372                  && o0->header.n_data_u64s == 1) ? o0 : 0);
1373
1374           /* if src address unspecified IGNORE any options */
1375           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
1376                             !is_unspecified && !is_link_local))
1377             {
1378               ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1379               if (nm->limit_neighbor_cache_size &&
1380                   pool_elts (nm->neighbor_pool) >=
1381                   nm->limit_neighbor_cache_size)
1382                 unset_random_neighbor_entry ();
1383
1384               vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0,
1385                                               &ip0->src_address,
1386                                               o0->ethernet_address,
1387                                               sizeof (o0->ethernet_address),
1388                                               0, 0);
1389             }
1390
1391           /* default is to drop */
1392           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1393
1394           if (error0 == ICMP6_ERROR_NONE)
1395             {
1396               vnet_sw_interface_t *sw_if0;
1397               ethernet_interface_t *eth_if0;
1398               u32 adj_index0;
1399
1400               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1401               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1402               eth_if0 =
1403                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1404
1405               /* only support ethernet interface type for now */
1406               error0 =
1407                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1408                 : error0;
1409
1410               if (error0 == ICMP6_ERROR_NONE)
1411                 {
1412                   u32 ri;
1413
1414                   /* adjust the sizeof the buffer to just include the ipv6 header */
1415                   p0->current_length -=
1416                     (options_len0 +
1417                      sizeof (icmp6_neighbor_discovery_header_t));
1418
1419                   /* look up the radv_t information for this interface */
1420                   vec_validate_init_empty
1421                     (nm->if_radv_pool_index_by_sw_if_index, sw_if_index0, ~0);
1422
1423                   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1424
1425                   if (ri != ~0)
1426                     radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1427
1428                   error0 =
1429                     ((!radv_info) ?
1430                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1431                      error0);
1432
1433                   if (error0 == ICMP6_ERROR_NONE)
1434                     {
1435                       f64 now = vlib_time_now (vm);
1436
1437                       /* for solicited adverts - need to rate limit */
1438                       if (is_solicitation)
1439                         {
1440                           if (0 != radv_info->last_radv_time &&
1441                               (now - radv_info->last_radv_time) <
1442                               MIN_DELAY_BETWEEN_RAS)
1443                             is_dropped = 1;
1444                           else
1445                             radv_info->last_radv_time = now;
1446                         }
1447
1448                       /* send now  */
1449                       icmp6_router_advertisement_header_t rh;
1450
1451                       rh.icmp.type = ICMP6_router_advertisement;
1452                       rh.icmp.code = 0;
1453                       rh.icmp.checksum = 0;
1454
1455                       rh.current_hop_limit = radv_info->curr_hop_limit;
1456                       rh.router_lifetime_in_sec =
1457                         clib_host_to_net_u16
1458                         (radv_info->adv_router_lifetime_in_sec);
1459                       rh.
1460                         time_in_msec_between_retransmitted_neighbor_solicitations
1461                         =
1462                         clib_host_to_net_u32 (radv_info->
1463                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
1464                       rh.neighbor_reachable_time_in_msec =
1465                         clib_host_to_net_u32 (radv_info->
1466                                               adv_neighbor_reachable_time_in_msec);
1467
1468                       rh.flags =
1469                         (radv_info->adv_managed_flag) ?
1470                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
1471                         0;
1472                       rh.flags |=
1473                         ((radv_info->adv_other_flag) ?
1474                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
1475                          0);
1476
1477
1478                       u16 payload_length =
1479                         sizeof (icmp6_router_advertisement_header_t);
1480
1481                       vlib_buffer_add_data (vm,
1482                                             p0->free_list_index,
1483                                             bi0,
1484                                             (void *) &rh,
1485                                             sizeof
1486                                             (icmp6_router_advertisement_header_t));
1487
1488                       if (radv_info->adv_link_layer_address)
1489                         {
1490                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
1491                             h;
1492
1493                           h.header.type =
1494                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1495                           h.header.n_data_u64s = 1;
1496
1497                           /* copy ll address */
1498                           clib_memcpy (&h.ethernet_address[0],
1499                                        eth_if0->address, 6);
1500
1501                           vlib_buffer_add_data (vm,
1502                                                 p0->free_list_index,
1503                                                 bi0,
1504                                                 (void *) &h,
1505                                                 sizeof
1506                                                 (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t));
1507
1508                           payload_length +=
1509                             sizeof
1510                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
1511                         }
1512
1513                       /* add MTU option */
1514                       if (radv_info->adv_link_mtu)
1515                         {
1516                           icmp6_neighbor_discovery_mtu_option_t h;
1517
1518                           h.unused = 0;
1519                           h.mtu =
1520                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
1521                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
1522                           h.header.n_data_u64s = 1;
1523
1524                           payload_length +=
1525                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
1526
1527                           vlib_buffer_add_data (vm,
1528                                                 p0->free_list_index,
1529                                                 bi0,
1530                                                 (void *) &h,
1531                                                 sizeof
1532                                                 (icmp6_neighbor_discovery_mtu_option_t));
1533                         }
1534
1535                       /* add advertised prefix options  */
1536                       ip6_radv_prefix_t *pr_info;
1537
1538                       /* *INDENT-OFF* */
1539                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1540                       ({
1541                         if(pr_info->enabled &&
1542                            (!pr_info->decrement_lifetime_flag
1543                             || (pr_info->pref_lifetime_expires >0)))
1544                           {
1545                             /* advertise this prefix */
1546                             icmp6_neighbor_discovery_prefix_information_option_t h;
1547
1548                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
1549                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
1550
1551                             h.dst_address_length  = pr_info->prefix_len;
1552
1553                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
1554                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
1555
1556                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
1557                               {
1558                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
1559                                 h.preferred_time  = 0;
1560                               }
1561                             else
1562                               {
1563                                 if(pr_info->decrement_lifetime_flag)
1564                                   {
1565                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
1566                                       (pr_info->valid_lifetime_expires  - now) : 0;
1567
1568                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
1569                                       (pr_info->pref_lifetime_expires  - now) : 0;
1570                                   }
1571
1572                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
1573                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
1574                               }
1575                             h.unused  = 0;
1576
1577                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
1578
1579                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
1580
1581                             vlib_buffer_add_data (vm,
1582                                                   p0->free_list_index,
1583                                                   bi0,
1584                                                   (void *)&h, sizeof(icmp6_neighbor_discovery_prefix_information_option_t));
1585
1586                           }
1587                       }));
1588                       /* *INDENT-ON* */
1589
1590                       /* add additional options before here */
1591
1592                       /* finish building the router advertisement... */
1593                       if (!is_unspecified && radv_info->send_unicast)
1594                         {
1595                           ip0->dst_address = ip0->src_address;
1596                         }
1597                       else
1598                         {
1599                           /* target address is all-nodes mcast addr */
1600                           ip6_set_reserved_multicast_address
1601                             (&ip0->dst_address,
1602                              IP6_MULTICAST_SCOPE_link_local,
1603                              IP6_MULTICAST_GROUP_ID_all_hosts);
1604                         }
1605
1606                       /* source address MUST be the link-local address */
1607                       ip0->src_address = radv_info->link_local_address;
1608
1609                       ip0->hop_limit = 255;
1610                       ip0->payload_length =
1611                         clib_host_to_net_u16 (payload_length);
1612
1613                       icmp6_router_advertisement_header_t *rh0 =
1614                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
1615                       rh0->icmp.checksum =
1616                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
1617                                                            &bogus_length);
1618                       ASSERT (bogus_length == 0);
1619
1620                       /* setup output if and adjacency */
1621                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
1622                         vnet_main.local_interface_sw_if_index;
1623
1624                       if (is_solicitation)
1625                         {
1626                           ethernet_header_t *eth0;
1627                           /* Reuse current MAC header, copy SMAC to DMAC and
1628                            * interface MAC to SMAC */
1629                           vlib_buffer_reset (p0);
1630                           eth0 = vlib_buffer_get_current (p0);
1631                           clib_memcpy (eth0->dst_address, eth0->src_address,
1632                                        6);
1633                           clib_memcpy (eth0->src_address, eth_if0->address,
1634                                        6);
1635                           next0 =
1636                             is_dropped ? next0 :
1637                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
1638                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1639                             sw_if_index0;
1640                         }
1641                       else
1642                         {
1643                           adj_index0 = radv_info->mcast_adj_index;
1644                           if (adj_index0 == 0)
1645                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
1646                           else
1647                             {
1648                               next0 =
1649                                 is_dropped ? next0 :
1650                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
1651                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1652                                 adj_index0;
1653                             }
1654                         }
1655                       p0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
1656
1657                       radv_info->n_solicitations_dropped += is_dropped;
1658                       radv_info->n_solicitations_rcvd += is_solicitation;
1659
1660                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
1661                         {
1662                           radv_info->n_advertisements_sent++;
1663                           n_advertisements_sent++;
1664                         }
1665                     }
1666                 }
1667             }
1668
1669           p0->error = error_node->errors[error0];
1670
1671           if (error0 != ICMP6_ERROR_NONE)
1672             vlib_error_count (vm, error_node->node_index, error0, 1);
1673
1674           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1675                                            to_next, n_left_to_next,
1676                                            bi0, next0);
1677
1678         }
1679
1680       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1681     }
1682
1683   /* Account for router advertisements sent. */
1684   vlib_error_count (vm, error_node->node_index,
1685                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
1686                     n_advertisements_sent);
1687
1688   return frame->n_vectors;
1689 }
1690
1691  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
1692 static_always_inline uword
1693 icmp6_router_advertisement (vlib_main_t * vm,
1694                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1695 {
1696   vnet_main_t *vnm = vnet_get_main ();
1697   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
1698   uword n_packets = frame->n_vectors;
1699   u32 *from, *to_next;
1700   u32 n_left_from, n_left_to_next, next_index;
1701   u32 n_advertisements_rcvd = 0;
1702
1703   vlib_node_runtime_t *error_node =
1704     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
1705
1706   from = vlib_frame_vector_args (frame);
1707   n_left_from = n_packets;
1708   next_index = node->cached_next_index;
1709
1710   if (node->flags & VLIB_NODE_FLAG_TRACE)
1711     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1712                                    /* stride */ 1,
1713                                    sizeof (icmp6_input_trace_t));
1714
1715   while (n_left_from > 0)
1716     {
1717       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1718
1719       while (n_left_from > 0 && n_left_to_next > 0)
1720         {
1721           vlib_buffer_t *p0;
1722           ip6_header_t *ip0;
1723           ip6_radv_t *radv_info = 0;
1724           icmp6_router_advertisement_header_t *h0;
1725           u32 bi0, options_len0, sw_if_index0, next0, error0;
1726
1727           bi0 = to_next[0] = from[0];
1728
1729           from += 1;
1730           to_next += 1;
1731           n_left_from -= 1;
1732           n_left_to_next -= 1;
1733
1734           p0 = vlib_get_buffer (vm, bi0);
1735           ip0 = vlib_buffer_get_current (p0);
1736           h0 = ip6_next_header (ip0);
1737           options_len0 =
1738             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
1739
1740           error0 = ICMP6_ERROR_NONE;
1741           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1742
1743           /* Check that source address is link-local */
1744           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
1745             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
1746
1747           /* default is to drop */
1748           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
1749
1750           n_advertisements_rcvd++;
1751
1752           if (error0 == ICMP6_ERROR_NONE)
1753             {
1754               vnet_sw_interface_t *sw_if0;
1755               ethernet_interface_t *eth_if0;
1756
1757               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
1758               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
1759               eth_if0 =
1760                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
1761
1762               /* only support ethernet interface type for now */
1763               error0 =
1764                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
1765                 : error0;
1766
1767               if (error0 == ICMP6_ERROR_NONE)
1768                 {
1769                   u32 ri;
1770
1771                   /* look up the radv_t information for this interface */
1772                   vec_validate_init_empty
1773                     (nm->if_radv_pool_index_by_sw_if_index, sw_if_index0, ~0);
1774
1775                   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0];
1776
1777                   if (ri != ~0)
1778                     radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
1779
1780                   error0 =
1781                     ((!radv_info) ?
1782                      ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
1783                      error0);
1784
1785                   if (error0 == ICMP6_ERROR_NONE)
1786                     {
1787                       /* validate advertised information */
1788                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
1789                           && (h0->current_hop_limit !=
1790                               radv_info->curr_hop_limit))
1791                         {
1792                           ip6_neighbor_syslog (vm, LOG_WARNING,
1793                                                "our AdvCurHopLimit on %U doesn't agree with %U",
1794                                                format_vnet_sw_if_index_name,
1795                                                vnm, sw_if_index0,
1796                                                format_ip6_address,
1797                                                &ip0->src_address);
1798                         }
1799
1800                       if ((h0->flags &
1801                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
1802                           != radv_info->adv_managed_flag)
1803                         {
1804                           ip6_neighbor_syslog (vm, LOG_WARNING,
1805                                                "our AdvManagedFlag on %U doesn't agree with %U",
1806                                                format_vnet_sw_if_index_name,
1807                                                vnm, sw_if_index0,
1808                                                format_ip6_address,
1809                                                &ip0->src_address);
1810                         }
1811
1812                       if ((h0->flags &
1813                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
1814                           != radv_info->adv_other_flag)
1815                         {
1816                           ip6_neighbor_syslog (vm, LOG_WARNING,
1817                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
1818                                                format_vnet_sw_if_index_name,
1819                                                vnm, sw_if_index0,
1820                                                format_ip6_address,
1821                                                &ip0->src_address);
1822                         }
1823
1824                       if ((h0->
1825                            time_in_msec_between_retransmitted_neighbor_solicitations
1826                            && radv_info->
1827                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
1828                           && (h0->
1829                               time_in_msec_between_retransmitted_neighbor_solicitations
1830                               !=
1831                               clib_host_to_net_u32 (radv_info->
1832                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
1833                         {
1834                           ip6_neighbor_syslog (vm, LOG_WARNING,
1835                                                "our AdvRetransTimer on %U doesn't agree with %U",
1836                                                format_vnet_sw_if_index_name,
1837                                                vnm, sw_if_index0,
1838                                                format_ip6_address,
1839                                                &ip0->src_address);
1840                         }
1841
1842                       if ((h0->neighbor_reachable_time_in_msec &&
1843                            radv_info->adv_neighbor_reachable_time_in_msec) &&
1844                           (h0->neighbor_reachable_time_in_msec !=
1845                            clib_host_to_net_u32
1846                            (radv_info->adv_neighbor_reachable_time_in_msec)))
1847                         {
1848                           ip6_neighbor_syslog (vm, LOG_WARNING,
1849                                                "our AdvReachableTime on %U doesn't agree with %U",
1850                                                format_vnet_sw_if_index_name,
1851                                                vnm, sw_if_index0,
1852                                                format_ip6_address,
1853                                                &ip0->src_address);
1854                         }
1855
1856                       /* check for MTU or prefix options or .. */
1857                       u8 *opt_hdr = (u8 *) (h0 + 1);
1858                       while (options_len0 > 0)
1859                         {
1860                           icmp6_neighbor_discovery_option_header_t *o0 =
1861                             (icmp6_neighbor_discovery_option_header_t *)
1862                             opt_hdr;
1863                           int opt_len = o0->n_data_u64s << 3;
1864                           icmp6_neighbor_discovery_option_type_t option_type =
1865                             o0->type;
1866
1867                           if (options_len0 < 2)
1868                             {
1869                               ip6_neighbor_syslog (vm, LOG_ERR,
1870                                                    "malformed RA packet on %U from %U",
1871                                                    format_vnet_sw_if_index_name,
1872                                                    vnm, sw_if_index0,
1873                                                    format_ip6_address,
1874                                                    &ip0->src_address);
1875                               break;
1876                             }
1877
1878                           if (opt_len == 0)
1879                             {
1880                               ip6_neighbor_syslog (vm, LOG_ERR,
1881                                                    " zero length option in RA on %U from %U",
1882                                                    format_vnet_sw_if_index_name,
1883                                                    vnm, sw_if_index0,
1884                                                    format_ip6_address,
1885                                                    &ip0->src_address);
1886                               break;
1887                             }
1888                           else if (opt_len > options_len0)
1889                             {
1890                               ip6_neighbor_syslog (vm, LOG_ERR,
1891                                                    "option length in RA packet  greater than total length on %U from %U",
1892                                                    format_vnet_sw_if_index_name,
1893                                                    vnm, sw_if_index0,
1894                                                    format_ip6_address,
1895                                                    &ip0->src_address);
1896                               break;
1897                             }
1898
1899                           options_len0 -= opt_len;
1900                           opt_hdr += opt_len;
1901
1902                           switch (option_type)
1903                             {
1904                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
1905                               {
1906                                 icmp6_neighbor_discovery_mtu_option_t *h =
1907                                   (icmp6_neighbor_discovery_mtu_option_t
1908                                    *) (o0);
1909
1910                                 if (opt_len < sizeof (*h))
1911                                   break;
1912
1913                                 if ((h->mtu && radv_info->adv_link_mtu) &&
1914                                     (h->mtu !=
1915                                      clib_host_to_net_u32
1916                                      (radv_info->adv_link_mtu)))
1917                                   {
1918                                     ip6_neighbor_syslog (vm, LOG_WARNING,
1919                                                          "our AdvLinkMTU on %U doesn't agree with %U",
1920                                                          format_vnet_sw_if_index_name,
1921                                                          vnm, sw_if_index0,
1922                                                          format_ip6_address,
1923                                                          &ip0->src_address);
1924                                   }
1925                               }
1926                               break;
1927
1928                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
1929                               {
1930                                 icmp6_neighbor_discovery_prefix_information_option_t
1931                                   * h =
1932                                   (icmp6_neighbor_discovery_prefix_information_option_t
1933                                    *) (o0);
1934
1935                                 /* validate advertised prefix options  */
1936                                 ip6_radv_prefix_t *pr_info;
1937                                 u32 preferred, valid;
1938
1939                                 if (opt_len < sizeof (*h))
1940                                   break;
1941
1942                                 preferred =
1943                                   clib_net_to_host_u32 (h->preferred_time);
1944                                 valid = clib_net_to_host_u32 (h->valid_time);
1945
1946                                 /* look for matching prefix - if we our advertising it, it better be consistant */
1947                                 /* *INDENT-OFF* */
1948                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1949                                 ({
1950
1951                                   ip6_address_t mask;
1952                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
1953
1954                                   if(pr_info->enabled &&
1955                                      (pr_info->prefix_len == h->dst_address_length) &&
1956                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
1957                                     {
1958                                       /* found it */
1959                                       if(!pr_info->decrement_lifetime_flag &&
1960                                          valid != pr_info->adv_valid_lifetime_in_secs)
1961                                         {
1962                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1963                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
1964                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1965                                                               format_ip6_address, &h->dst_address);
1966                                         }
1967                                       if(!pr_info->decrement_lifetime_flag &&
1968                                          preferred != pr_info->adv_pref_lifetime_in_secs)
1969                                         {
1970                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1971                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
1972                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1973                                                               format_ip6_address, &h->dst_address);
1974                                         }
1975                                     }
1976                                   break;
1977                                 }));
1978                                 /* *INDENT-ON* */
1979                                 break;
1980                               }
1981                             default:
1982                               /* skip this one */
1983                               break;
1984                             }
1985                         }
1986                     }
1987                 }
1988             }
1989
1990           p0->error = error_node->errors[error0];
1991
1992           if (error0 != ICMP6_ERROR_NONE)
1993             vlib_error_count (vm, error_node->node_index, error0, 1);
1994
1995           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1996                                            to_next, n_left_to_next,
1997                                            bi0, next0);
1998         }
1999
2000       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2001     }
2002
2003   /* Account for router advertisements sent. */
2004   vlib_error_count (vm, error_node->node_index,
2005                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
2006                     n_advertisements_rcvd);
2007
2008   return frame->n_vectors;
2009 }
2010
2011 /**
2012  * @brief Add a multicast Address to the advertised MLD set
2013  */
2014 static void
2015 ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2016 {
2017   ip6_mldp_group_t *mcast_group_info;
2018   uword *p;
2019
2020   /* lookup  mldp info for this interface */
2021   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2022   mcast_group_info =
2023     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2024
2025   /* add address */
2026   if (!mcast_group_info)
2027     {
2028       /* add */
2029       u32 mi;
2030       pool_get (radv_info->mldp_group_pool, mcast_group_info);
2031
2032       mi = mcast_group_info - radv_info->mldp_group_pool;
2033       mhash_set (&radv_info->address_to_mldp_index, &addr, mi,  /* old_value */
2034                  0);
2035
2036       mcast_group_info->type = 4;
2037       mcast_group_info->mcast_source_address_pool = 0;
2038       mcast_group_info->num_sources = 0;
2039       clib_memcpy (&mcast_group_info->mcast_address, &addr,
2040                    sizeof (ip6_address_t));
2041     }
2042 }
2043
2044 /**
2045  * @brief Delete a multicast Address from the advertised MLD set
2046  */
2047 static void
2048 ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr)
2049 {
2050   ip6_mldp_group_t *mcast_group_info;
2051   uword *p;
2052
2053   p = mhash_get (&radv_info->address_to_mldp_index, &addr);
2054   mcast_group_info =
2055     p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0;
2056
2057   if (mcast_group_info)
2058     {
2059       mhash_unset (&radv_info->address_to_mldp_index, &addr,
2060                    /* old_value */ 0);
2061       pool_put (radv_info->mldp_group_pool, mcast_group_info);
2062     }
2063 }
2064
2065 /**
2066  * @brief Add a multicast Address to the advertised MLD set
2067  */
2068 static void
2069 ip6_neighbor_add_mld_grp (ip6_radv_t * a,
2070                           ip6_multicast_address_scope_t scope,
2071                           ip6_multicast_link_local_group_id_t group)
2072 {
2073   ip6_address_t addr;
2074
2075   ip6_set_reserved_multicast_address (&addr, scope, group);
2076
2077   ip6_neighbor_add_mld_prefix (a, &addr);
2078 }
2079
2080 /**
2081  * @brief create and initialize router advertisement parameters with default
2082  * values for this intfc
2083  */
2084 u32
2085 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm,
2086                                    u32 sw_if_index, u32 is_add)
2087 {
2088   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2089   ip6_radv_t *a = 0;
2090   u32 ri = ~0;
2091   vnet_sw_interface_t *sw_if0;
2092   ethernet_interface_t *eth_if0 = 0;
2093
2094   /* lookup radv container  - ethernet interfaces only */
2095   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2096   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2097     eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2098
2099   if (!eth_if0)
2100     return ri;
2101
2102   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2103                            ~0);
2104   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2105
2106   if (ri != ~0)
2107     {
2108       a = pool_elt_at_index (nm->if_radv_pool, ri);
2109
2110       if (!is_add)
2111         {
2112           ip6_radv_prefix_t *p;
2113           ip6_mldp_group_t *m;
2114
2115           /* release the lock on the interface's mcast adj */
2116           adj_unlock (a->mcast_adj_index);
2117
2118           /* clean up prefix and MDP pools */
2119           /* *INDENT-OFF* */
2120           pool_flush(p, a->adv_prefixes_pool,
2121           ({
2122               mhash_unset (&a->address_to_prefix_index, &p->prefix, 0);
2123           }));
2124           pool_flush (m, a->mldp_group_pool,
2125           ({
2126               mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0);
2127           }));
2128           /* *INDENT-ON* */
2129
2130           pool_free (a->mldp_group_pool);
2131           pool_free (a->adv_prefixes_pool);
2132
2133           mhash_free (&a->address_to_prefix_index);
2134           mhash_free (&a->address_to_mldp_index);
2135
2136           pool_put (nm->if_radv_pool, a);
2137           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0;
2138           ri = ~0;
2139         }
2140     }
2141   else
2142     {
2143       if (is_add)
2144         {
2145           vnet_hw_interface_t *hw_if0;
2146
2147           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index);
2148
2149           pool_get (nm->if_radv_pool, a);
2150
2151           ri = a - nm->if_radv_pool;
2152           nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri;
2153
2154           /* initialize default values (most of which are zero) */
2155           memset (a, 0, sizeof (a[0]));
2156
2157           a->sw_if_index = sw_if_index;
2158           a->max_radv_interval = DEF_MAX_RADV_INTERVAL;
2159           a->min_radv_interval = DEF_MIN_RADV_INTERVAL;
2160           a->curr_hop_limit = DEF_CURR_HOP_LIMIT;
2161           a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
2162
2163           /* send ll address source address option */
2164           a->adv_link_layer_address = 1;
2165
2166           a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
2167           a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
2168           a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
2169           a->seed = (u32) clib_cpu_time_now ();
2170           (void) random_u32 (&a->seed);
2171           a->randomizer = clib_cpu_time_now ();
2172           (void) random_u64 (&a->randomizer);
2173
2174           a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
2175           a->initial_adverts_sent = a->initial_adverts_count - 1;
2176           a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
2177
2178           /* deafult is to send */
2179           a->send_radv = 1;
2180
2181           /* fill in radv_info for this interface that will be needed later */
2182           a->adv_link_mtu = hw_if0->max_l3_packet_bytes[VLIB_RX];
2183
2184           clib_memcpy (a->link_layer_address, eth_if0->address, 6);
2185
2186           /* fill in default link-local address  (this may be overridden) */
2187           ip6_link_local_address_from_ethernet_address
2188             (&a->link_local_address, eth_if0->address);
2189
2190           mhash_init (&a->address_to_prefix_index, sizeof (uword),
2191                       sizeof (ip6_address_t));
2192           mhash_init (&a->address_to_mldp_index, sizeof (uword),
2193                       sizeof (ip6_address_t));
2194
2195           a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
2196                                                       VNET_LINK_IP6,
2197                                                       sw_if_index);
2198
2199           /* add multicast groups we will always be reporting  */
2200           ip6_neighbor_add_mld_grp (a,
2201                                     IP6_MULTICAST_SCOPE_link_local,
2202                                     IP6_MULTICAST_GROUP_ID_all_hosts);
2203           ip6_neighbor_add_mld_grp (a,
2204                                     IP6_MULTICAST_SCOPE_link_local,
2205                                     IP6_MULTICAST_GROUP_ID_all_routers);
2206           ip6_neighbor_add_mld_grp (a,
2207                                     IP6_MULTICAST_SCOPE_link_local,
2208                                     IP6_MULTICAST_GROUP_ID_mldv2_routers);
2209         }
2210     }
2211   return ri;
2212 }
2213
2214 /* send an mldpv2 report  */
2215 static void
2216 ip6_neighbor_send_mldpv2_report (u32 sw_if_index)
2217 {
2218   vnet_main_t *vnm = vnet_get_main ();
2219   vlib_main_t *vm = vnm->vlib_main;
2220   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2221   vnet_sw_interface_t *sw_if0;
2222   ethernet_interface_t *eth_if0;
2223   u32 ri;
2224   int bogus_length;
2225
2226   ip6_radv_t *radv_info;
2227   u16 payload_length;
2228   vlib_buffer_t *b0;
2229   ip6_header_t *ip0;
2230   u32 *to_next;
2231   vlib_frame_t *f;
2232   u32 bo0;
2233   u32 n_to_alloc = 1;
2234   u32 n_allocated;
2235
2236   icmp6_multicast_listener_report_header_t *rh0;
2237   icmp6_multicast_listener_report_packet_t *rp0;
2238
2239   sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2240   ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
2241   eth_if0 = ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2242
2243   if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index))
2244     return;
2245
2246   /* look up the radv_t  information for this interface */
2247   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2248                            ~0);
2249
2250   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2251
2252   if (ri == ~0)
2253     return;
2254
2255   /* send report now - build a mldpv2 report packet  */
2256   n_allocated = vlib_buffer_alloc_from_free_list (vm,
2257                                                   &bo0,
2258                                                   n_to_alloc,
2259                                                   VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2260   if (PREDICT_FALSE (n_allocated == 0))
2261     {
2262       clib_warning ("buffer allocation failure");
2263       return;
2264     }
2265
2266   b0 = vlib_get_buffer (vm, bo0);
2267
2268   /* adjust the sizeof the buffer to just include the ipv6 header */
2269   b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t);
2270
2271   payload_length = sizeof (icmp6_multicast_listener_report_header_t);
2272
2273   b0->error = ICMP6_ERROR_NONE;
2274
2275   rp0 = vlib_buffer_get_current (b0);
2276   ip0 = (ip6_header_t *) & rp0->ip;
2277   rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr;
2278
2279   memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t));
2280
2281   ip0->ip_version_traffic_class_and_flow_label =
2282     clib_host_to_net_u32 (0x6 << 28);
2283
2284   ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
2285   /* for DEBUG - vnet driver won't seem to emit router alerts */
2286   /* ip0->protocol = IP_PROTOCOL_ICMP6; */
2287   ip0->hop_limit = 1;
2288
2289   rh0->icmp.type = ICMP6_multicast_listener_report_v2;
2290
2291   /* source address MUST be the link-local address */
2292   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2293   ip0->src_address = radv_info->link_local_address;
2294
2295   /* destination is all mldpv2 routers */
2296   ip6_set_reserved_multicast_address (&ip0->dst_address,
2297                                       IP6_MULTICAST_SCOPE_link_local,
2298                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
2299
2300   /* add reports here */
2301   ip6_mldp_group_t *m;
2302   int num_addr_records = 0;
2303   icmp6_multicast_address_record_t rr;
2304
2305   /* fill in the hop-by-hop extension header (router alert) info */
2306   rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
2307   rh0->ext_hdr.n_data_u64s = 0;
2308
2309   rh0->alert.type = IP6_MLDP_ALERT_TYPE;
2310   rh0->alert.len = 2;
2311   rh0->alert.value = 0;
2312
2313   rh0->pad.type = 1;
2314   rh0->pad.len = 0;
2315
2316   rh0->icmp.checksum = 0;
2317
2318   /* *INDENT-OFF* */
2319   pool_foreach (m, radv_info->mldp_group_pool,
2320   ({
2321     rr.type = m->type;
2322     rr.aux_data_len_u32s = 0;
2323     rr.num_sources = clib_host_to_net_u16 (m->num_sources);
2324     clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t));
2325
2326     num_addr_records++;
2327
2328     vlib_buffer_add_data
2329       (vm, b0->free_list_index, bo0,
2330        (void *)&rr, sizeof(icmp6_multicast_address_record_t));
2331
2332     payload_length += sizeof( icmp6_multicast_address_record_t);
2333   }));
2334   /* *INDENT-ON* */
2335
2336   rh0->rsvd = 0;
2337   rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records);
2338
2339   /* update lengths */
2340   ip0->payload_length = clib_host_to_net_u16 (payload_length);
2341
2342   rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0,
2343                                                           &bogus_length);
2344   ASSERT (bogus_length == 0);
2345
2346   /*
2347    * OK to override w/ no regard for actual FIB, because
2348    * ip6-rewrite only looks at the adjacency.
2349    */
2350   vnet_buffer (b0)->sw_if_index[VLIB_RX] =
2351     vnet_main.local_interface_sw_if_index;
2352
2353   vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index;
2354   b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
2355
2356   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast");
2357
2358   f = vlib_get_frame_to_node (vm, node->index);
2359   to_next = vlib_frame_vector_args (f);
2360   to_next[0] = bo0;
2361   f->n_vectors = 1;
2362
2363   vlib_put_frame_to_node (vm, node->index, f);
2364   return;
2365 }
2366
2367 /* *INDENT-OFF* */
2368 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
2369 {
2370   .function = icmp6_router_solicitation,
2371   .name = "icmp6-router-solicitation",
2372
2373   .vector_size = sizeof (u32),
2374
2375   .format_trace = format_icmp6_input_trace,
2376
2377   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
2378   .next_nodes = {
2379     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "error-drop",
2380     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
2381     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
2382   },
2383 };
2384 /* *INDENT-ON* */
2385
2386 /* send a RA or update the timer info etc.. */
2387 static uword
2388 ip6_neighbor_process_timer_event (vlib_main_t * vm,
2389                                   vlib_node_runtime_t * node,
2390                                   vlib_frame_t * frame)
2391 {
2392   vnet_main_t *vnm = vnet_get_main ();
2393   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2394   ip6_radv_t *radv_info;
2395   vlib_frame_t *f = 0;
2396   u32 n_this_frame = 0;
2397   u32 n_left_to_next = 0;
2398   u32 *to_next = 0;
2399   u32 bo0;
2400   icmp6_router_solicitation_header_t *h0;
2401   vlib_buffer_t *b0;
2402   f64 now = vlib_time_now (vm);
2403
2404   /* Interface ip6 radv info list */
2405   /* *INDENT-OFF* */
2406   pool_foreach (radv_info, nm->if_radv_pool,
2407   ({
2408     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
2409       {
2410         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
2411         radv_info->next_multicast_time = now;
2412         radv_info->last_multicast_time = now;
2413         radv_info->last_radv_time = 0;
2414         radv_info->all_routers_mcast = 0;
2415         continue;
2416       }
2417
2418     /* Make sure that we've joined the all-routers multicast group */
2419     if(!radv_info->all_routers_mcast)
2420       {
2421         /* send MDLP_REPORT_EVENT message */
2422         ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index);
2423         radv_info->all_routers_mcast = 1;
2424       }
2425
2426     /* is it time to send a multicast  RA on this interface? */
2427     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
2428       {
2429         u32 n_to_alloc = 1;
2430         u32 n_allocated;
2431
2432         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
2433           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
2434
2435         /* multicast send - compute next multicast send time */
2436         if( radv_info->initial_adverts_sent > 0)
2437           {
2438             radv_info->initial_adverts_sent--;
2439             if(rfn > radv_info-> initial_adverts_interval)
2440               rfn =  radv_info-> initial_adverts_interval;
2441
2442             /* check to see if we are ceasing to send */
2443             if( radv_info->initial_adverts_sent  == 0)
2444               if(radv_info->cease_radv)
2445                 radv_info->send_radv = 0;
2446           }
2447
2448         radv_info->next_multicast_time =  rfn + now;
2449         radv_info->last_multicast_time = now;
2450
2451         /* send advert now - build a "solicted" router advert with unspecified source address */
2452         n_allocated = vlib_buffer_alloc_from_free_list
2453           (vm, &bo0, n_to_alloc, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
2454
2455         if (PREDICT_FALSE(n_allocated == 0))
2456           {
2457             clib_warning ("buffer allocation failure");
2458             continue;
2459           }
2460         b0 = vlib_get_buffer (vm, bo0);
2461         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
2462         b0->error = ICMP6_ERROR_NONE;
2463         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
2464
2465         h0 =  vlib_buffer_get_current (b0);
2466
2467         memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
2468
2469         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2470         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
2471                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
2472         h0->ip.protocol = IP_PROTOCOL_ICMP6;
2473         h0->ip.hop_limit = 255;
2474
2475         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
2476         h0->ip.src_address.as_u64[0] = 0;
2477         h0->ip.src_address.as_u64[1] = 0;
2478
2479         h0->ip.dst_address.as_u64[0] = 0;
2480         h0->ip.dst_address.as_u64[1] = 0;
2481
2482         h0->neighbor.icmp.type = ICMP6_router_solicitation;
2483
2484         if (PREDICT_FALSE(f == 0))
2485           {
2486             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
2487             to_next = vlib_frame_vector_args (f);
2488             n_left_to_next = VLIB_FRAME_SIZE;
2489             n_this_frame = 0;
2490           }
2491
2492         n_this_frame++;
2493         n_left_to_next--;
2494         to_next[0] = bo0;
2495         to_next += 1;
2496
2497         if (PREDICT_FALSE(n_left_to_next == 0))
2498           {
2499             f->n_vectors = n_this_frame;
2500             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
2501             f = 0;
2502           }
2503       }
2504   }));
2505   /* *INDENT-ON* */
2506
2507   if (f)
2508     {
2509       ASSERT (n_this_frame);
2510       f->n_vectors = n_this_frame;
2511       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
2512     }
2513   return 0;
2514 }
2515
2516 static uword
2517 ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm,
2518                                            vlib_node_runtime_t * node,
2519                                            vlib_frame_t * frame)
2520 {
2521   uword event_type;
2522   ip6_icmp_neighbor_discovery_event_data_t *event_data;
2523
2524   /* init code here */
2525
2526   while (1)
2527     {
2528       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
2529
2530       event_data = vlib_process_get_event_data (vm, &event_type);
2531
2532       if (!event_data)
2533         {
2534           /* No events found: timer expired. */
2535           /* process interface list and send RAs as appropriate, update timer info */
2536           ip6_neighbor_process_timer_event (vm, node, frame);
2537         }
2538       else
2539         {
2540           switch (event_type)
2541             {
2542
2543             case ICMP6_ND_EVENT_INIT:
2544               break;
2545
2546             case ~0:
2547               break;
2548
2549             default:
2550               ASSERT (0);
2551             }
2552
2553           if (event_data)
2554             _vec_len (event_data) = 0;
2555         }
2556     }
2557   return frame->n_vectors;
2558 }
2559
2560 /* *INDENT-OFF* */
2561 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
2562 {
2563   .function = icmp6_router_advertisement,
2564   .name = "icmp6-router-advertisement",
2565
2566   .vector_size = sizeof (u32),
2567
2568   .format_trace = format_icmp6_input_trace,
2569
2570   .n_next_nodes = 1,
2571   .next_nodes = {
2572     [0] = "error-drop",
2573   },
2574 };
2575 /* *INDENT-ON* */
2576
2577 vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = {
2578
2579   .function = ip6_icmp_neighbor_discovery_event_process,
2580   .name = "ip6-icmp-neighbor-discovery-event-process",
2581   .type = VLIB_NODE_TYPE_PROCESS,
2582 };
2583
2584 static uword
2585 icmp6_neighbor_solicitation (vlib_main_t * vm,
2586                              vlib_node_runtime_t * node, vlib_frame_t * frame)
2587 {
2588   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
2589                                                        /* is_solicitation */
2590                                                        1);
2591 }
2592
2593 static uword
2594 icmp6_neighbor_advertisement (vlib_main_t * vm,
2595                               vlib_node_runtime_t * node,
2596                               vlib_frame_t * frame)
2597 {
2598   return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame,
2599                                                        /* is_solicitation */
2600                                                        0);
2601 }
2602
2603 /* *INDENT-OFF* */
2604 VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) =
2605 {
2606   .function = icmp6_neighbor_solicitation,
2607   .name = "icmp6-neighbor-solicitation",
2608
2609   .vector_size = sizeof (u32),
2610
2611   .format_trace = format_icmp6_input_trace,
2612
2613   .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
2614   .next_nodes = {
2615     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "error-drop",
2616     [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output",
2617   },
2618 };
2619 /* *INDENT-ON* */
2620
2621 /* *INDENT-OFF* */
2622 VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) =
2623 {
2624   .function = icmp6_neighbor_advertisement,
2625   .name = "icmp6-neighbor-advertisement",
2626
2627   .vector_size = sizeof (u32),
2628
2629   .format_trace = format_icmp6_input_trace,
2630
2631   .n_next_nodes = 1,
2632   .next_nodes = {
2633     [0] = "error-drop",
2634   },
2635 };
2636 /* *INDENT-ON* */
2637
2638 /* API support functions */
2639 int
2640 ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index,
2641                         u8 suppress, u8 managed, u8 other,
2642                         u8 ll_option, u8 send_unicast, u8 cease,
2643                         u8 use_lifetime, u32 lifetime,
2644                         u32 initial_count, u32 initial_interval,
2645                         u32 max_interval, u32 min_interval, u8 is_no)
2646 {
2647   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2648   int error;
2649   u32 ri;
2650
2651   /* look up the radv_t  information for this interface */
2652   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2653                            ~0);
2654   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2655   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
2656
2657   if (!error)
2658     {
2659
2660       ip6_radv_t *radv_info;
2661       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2662
2663       if ((max_interval != 0) && (min_interval == 0))
2664         min_interval = .75 * max_interval;
2665
2666       max_interval =
2667         (max_interval !=
2668          0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
2669         radv_info->max_radv_interval;
2670       min_interval =
2671         (min_interval !=
2672          0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
2673         radv_info->min_radv_interval;
2674       lifetime =
2675         (use_lifetime !=
2676          0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
2677         radv_info->adv_router_lifetime_in_sec;
2678
2679       if (lifetime)
2680         {
2681           if (lifetime > MAX_DEF_RTR_LIFETIME)
2682             lifetime = MAX_DEF_RTR_LIFETIME;
2683
2684           if (lifetime <= max_interval)
2685             return VNET_API_ERROR_INVALID_VALUE;
2686         }
2687
2688       if (min_interval != 0)
2689         {
2690           if ((min_interval > .75 * max_interval) || (min_interval < 3))
2691             return VNET_API_ERROR_INVALID_VALUE;
2692         }
2693
2694       if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
2695           (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
2696         return VNET_API_ERROR_INVALID_VALUE;
2697
2698       /*
2699          if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
2700          if "flag" is clear  don't change corresponding value
2701        */
2702       radv_info->send_radv =
2703         (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
2704       radv_info->adv_managed_flag =
2705         (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
2706       radv_info->adv_other_flag =
2707         (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
2708       radv_info->adv_link_layer_address =
2709         (ll_option !=
2710          0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
2711       radv_info->send_unicast =
2712         (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
2713       radv_info->cease_radv =
2714         (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
2715
2716       radv_info->min_radv_interval = min_interval;
2717       radv_info->max_radv_interval = max_interval;
2718       radv_info->adv_router_lifetime_in_sec = lifetime;
2719
2720       radv_info->initial_adverts_count =
2721         (initial_count !=
2722          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
2723         radv_info->initial_adverts_count;
2724       radv_info->initial_adverts_interval =
2725         (initial_interval !=
2726          0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
2727         radv_info->initial_adverts_interval;
2728
2729       /* restart */
2730       if ((cease != 0) && (is_no))
2731         radv_info->send_radv = 1;
2732
2733       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
2734       radv_info->next_multicast_time = vlib_time_now (vm);
2735       radv_info->last_multicast_time = vlib_time_now (vm);
2736       radv_info->last_radv_time = 0;
2737     }
2738   return (error);
2739 }
2740
2741 int
2742 ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
2743                         ip6_address_t * prefix_addr, u8 prefix_len,
2744                         u8 use_default, u32 val_lifetime, u32 pref_lifetime,
2745                         u8 no_advertise, u8 off_link, u8 no_autoconfig,
2746                         u8 no_onlink, u8 is_no)
2747 {
2748   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2749   int error;
2750
2751   u32 ri;
2752
2753   /* look up the radv_t  information for this interface */
2754   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
2755                            ~0);
2756
2757   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2758
2759   error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX;
2760
2761   if (!error)
2762     {
2763       f64 now = vlib_time_now (vm);
2764       ip6_radv_t *radv_info;
2765       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2766
2767       /* prefix info add, delete or update */
2768       ip6_radv_prefix_t *prefix;
2769
2770       /* lookup  prefix info for this  address on this interface */
2771       uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
2772
2773       prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
2774
2775       if (is_no)
2776         {
2777           /* delete */
2778           if (!prefix)
2779             return VNET_API_ERROR_INVALID_VALUE;        /* invalid prefix */
2780
2781           if (prefix->prefix_len != prefix_len)
2782             return VNET_API_ERROR_INVALID_VALUE_2;
2783
2784           /* FIXME - Should the DP do this or the CP ? */
2785           /* do specific delete processing here before returning */
2786           /* try to remove from routing table */
2787
2788           mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
2789                        /* old_value */ 0);
2790           pool_put (radv_info->adv_prefixes_pool, prefix);
2791
2792           radv_info->initial_adverts_sent =
2793             radv_info->initial_adverts_count - 1;
2794           radv_info->next_multicast_time = vlib_time_now (vm);
2795           radv_info->last_multicast_time = vlib_time_now (vm);
2796           radv_info->last_radv_time = 0;
2797           return (error);
2798         }
2799
2800       /* adding or changing */
2801       if (!prefix)
2802         {
2803           /* add */
2804           u32 pi;
2805           pool_get (radv_info->adv_prefixes_pool, prefix);
2806           pi = prefix - radv_info->adv_prefixes_pool;
2807           mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
2808                      /* old_value */ 0);
2809
2810           memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
2811
2812           prefix->prefix_len = prefix_len;
2813           clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
2814
2815           /* initialize default values */
2816           prefix->adv_on_link_flag = 1; /* L bit set */
2817           prefix->adv_autonomous_flag = 1;      /* A bit set */
2818           prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
2819           prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
2820           prefix->enabled = 1;
2821           prefix->decrement_lifetime_flag = 1;
2822           prefix->deprecated_prefix_flag = 1;
2823
2824           if (off_link == 0)
2825             {
2826               /* FIXME - Should the DP do this or the CP ? */
2827               /* insert prefix into routing table as a connected prefix */
2828             }
2829
2830           if (use_default)
2831             goto restart;
2832         }
2833       else
2834         {
2835
2836           if (prefix->prefix_len != prefix_len)
2837             return VNET_API_ERROR_INVALID_VALUE_2;
2838
2839           if (off_link != 0)
2840             {
2841               /* FIXME - Should the DP do this or the CP ? */
2842               /* remove from routing table if already there */
2843             }
2844         }
2845
2846       if ((val_lifetime == ~0) || (pref_lifetime == ~0))
2847         {
2848           prefix->adv_valid_lifetime_in_secs = ~0;
2849           prefix->adv_pref_lifetime_in_secs = ~0;
2850           prefix->decrement_lifetime_flag = 0;
2851         }
2852       else
2853         {
2854           prefix->adv_valid_lifetime_in_secs = val_lifetime;;
2855           prefix->adv_pref_lifetime_in_secs = pref_lifetime;
2856         }
2857
2858       /* copy  remaining */
2859       prefix->enabled = !(no_advertise != 0);
2860       prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
2861       prefix->adv_autonomous_flag = !(no_autoconfig != 0);
2862
2863     restart:
2864       /* restart */
2865       /* fill in the expiration times  */
2866       prefix->valid_lifetime_expires =
2867         now + prefix->adv_valid_lifetime_in_secs;
2868       prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
2869
2870       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
2871       radv_info->next_multicast_time = vlib_time_now (vm);
2872       radv_info->last_multicast_time = vlib_time_now (vm);
2873       radv_info->last_radv_time = 0;
2874     }
2875   return (error);
2876 }
2877
2878 clib_error_t *
2879 ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
2880                   vlib_cli_command_t * cmd)
2881 {
2882   vnet_main_t *vnm = vnet_get_main ();
2883   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
2884   clib_error_t *error = 0;
2885   u8 is_no = 0;
2886   u8 suppress = 0, managed = 0, other = 0;
2887   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
2888   u8 use_lifetime = 0;
2889   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
2890     0, ra_initial_interval = 0;
2891   u32 ra_max_interval = 0, ra_min_interval = 0;
2892
2893   unformat_input_t _line_input, *line_input = &_line_input;
2894   vnet_sw_interface_t *sw_if0;
2895
2896   int add_radv_info = 1;
2897   __attribute__ ((unused)) ip6_radv_t *radv_info = 0;
2898   ip6_address_t ip6_addr;
2899   u32 addr_len;
2900
2901
2902   /* Get a line of input. */
2903   if (!unformat_user (main_input, unformat_line_input, line_input))
2904     return 0;
2905
2906   /* get basic radv info for this interface */
2907   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2908     {
2909
2910       if (unformat_user (line_input,
2911                          unformat_vnet_sw_interface, vnm, &sw_if_index))
2912         {
2913           u32 ri;
2914           ethernet_interface_t *eth_if0 = 0;
2915
2916           sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
2917           if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
2918             eth_if0 =
2919               ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
2920
2921           if (!eth_if0)
2922             {
2923               error =
2924                 clib_error_return (0, "Interface must be of ethernet type");
2925               goto done;
2926             }
2927
2928           /* look up the radv_t  information for this interface */
2929           vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
2930                                    sw_if_index, ~0);
2931
2932           ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
2933
2934           if (ri != ~0)
2935             {
2936               radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
2937             }
2938           else
2939             {
2940               error = clib_error_return (0, "unknown interface %U'",
2941                                          format_unformat_error, line_input);
2942               goto done;
2943             }
2944         }
2945       else
2946         {
2947           error = clib_error_return (0, "invalid interface name %U'",
2948                                      format_unformat_error, line_input);
2949           goto done;
2950         }
2951     }
2952
2953   /* get the rest of the command */
2954   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2955     {
2956       if (unformat (line_input, "no"))
2957         is_no = 1;
2958       else if (unformat (line_input, "prefix %U/%d",
2959                          unformat_ip6_address, &ip6_addr, &addr_len))
2960         {
2961           add_radv_info = 0;
2962           break;
2963         }
2964       else if (unformat (line_input, "ra-managed-config-flag"))
2965         {
2966           managed = 1;
2967           break;
2968         }
2969       else if (unformat (line_input, "ra-other-config-flag"))
2970         {
2971           other = 1;
2972           break;
2973         }
2974       else if (unformat (line_input, "ra-suppress") ||
2975                unformat (line_input, "ra-surpress"))
2976         {
2977           suppress = 1;
2978           break;
2979         }
2980       else if (unformat (line_input, "ra-suppress-link-layer") ||
2981                unformat (line_input, "ra-surpress-link-layer"))
2982         {
2983           suppress_ll_option = 1;
2984           break;
2985         }
2986       else if (unformat (line_input, "ra-send-unicast"))
2987         {
2988           send_unicast = 1;
2989           break;
2990         }
2991       else if (unformat (line_input, "ra-lifetime"))
2992         {
2993           if (!unformat (line_input, "%d", &ra_lifetime))
2994             {
2995               error = unformat_parse_error (line_input);
2996               goto done;
2997             }
2998           use_lifetime = 1;
2999           break;
3000         }
3001       else if (unformat (line_input, "ra-initial"))
3002         {
3003           if (!unformat
3004               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
3005             {
3006               error = unformat_parse_error (line_input);
3007               goto done;
3008             }
3009           break;
3010         }
3011       else if (unformat (line_input, "ra-interval"))
3012         {
3013           if (!unformat (line_input, "%d", &ra_max_interval))
3014             {
3015               error = unformat_parse_error (line_input);
3016               goto done;
3017             }
3018
3019           if (!unformat (line_input, "%d", &ra_min_interval))
3020             ra_min_interval = 0;
3021           break;
3022         }
3023       else if (unformat (line_input, "ra-cease"))
3024         {
3025           cease = 1;
3026           break;
3027         }
3028       else
3029         {
3030           error = unformat_parse_error (line_input);
3031           goto done;
3032         }
3033     }
3034
3035   if (add_radv_info)
3036     {
3037       ip6_neighbor_ra_config (vm, sw_if_index,
3038                               suppress, managed, other,
3039                               suppress_ll_option, send_unicast, cease,
3040                               use_lifetime, ra_lifetime,
3041                               ra_initial_count, ra_initial_interval,
3042                               ra_max_interval, ra_min_interval, is_no);
3043     }
3044   else
3045     {
3046       u32 valid_lifetime_in_secs = 0;
3047       u32 pref_lifetime_in_secs = 0;
3048       u8 use_prefix_default_values = 0;
3049       u8 no_advertise = 0;
3050       u8 off_link = 0;
3051       u8 no_autoconfig = 0;
3052       u8 no_onlink = 0;
3053
3054       /* get the rest of the command */
3055       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3056         {
3057           if (unformat (line_input, "default"))
3058             {
3059               use_prefix_default_values = 1;
3060               break;
3061             }
3062           else if (unformat (line_input, "infinite"))
3063             {
3064               valid_lifetime_in_secs = ~0;
3065               pref_lifetime_in_secs = ~0;
3066               break;
3067             }
3068           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
3069                              &pref_lifetime_in_secs))
3070             break;
3071           else
3072             break;
3073         }
3074
3075
3076       /* get the rest of the command */
3077       while (!use_prefix_default_values &&
3078              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3079         {
3080           if (unformat (line_input, "no-advertise"))
3081             no_advertise = 1;
3082           else if (unformat (line_input, "off-link"))
3083             off_link = 1;
3084           else if (unformat (line_input, "no-autoconfig"))
3085             no_autoconfig = 1;
3086           else if (unformat (line_input, "no-onlink"))
3087             no_onlink = 1;
3088           else
3089             {
3090               error = unformat_parse_error (line_input);
3091               goto done;
3092             }
3093         }
3094
3095       ip6_neighbor_ra_prefix (vm, sw_if_index,
3096                               &ip6_addr, addr_len,
3097                               use_prefix_default_values,
3098                               valid_lifetime_in_secs,
3099                               pref_lifetime_in_secs,
3100                               no_advertise,
3101                               off_link, no_autoconfig, no_onlink, is_no);
3102     }
3103
3104 done:
3105   unformat_free (line_input);
3106
3107   return error;
3108 }
3109
3110 static void
3111 ip6_print_addrs (vlib_main_t * vm, u32 * addrs)
3112 {
3113   ip_lookup_main_t *lm = &ip6_main.lookup_main;
3114   u32 i;
3115
3116   for (i = 0; i < vec_len (addrs); i++)
3117     {
3118       ip_interface_address_t *a =
3119         pool_elt_at_index (lm->if_address_pool, addrs[i]);
3120       ip6_address_t *address = ip_interface_address_get_address (lm, a);
3121
3122       vlib_cli_output (vm, "\t\t%U/%d",
3123                        format_ip6_address, address, a->address_length);
3124     }
3125 }
3126
3127 static clib_error_t *
3128 show_ip6_interface_cmd (vlib_main_t * vm,
3129                         unformat_input_t * input, vlib_cli_command_t * cmd)
3130 {
3131   vnet_main_t *vnm = vnet_get_main ();
3132   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3133   clib_error_t *error = 0;
3134   u32 sw_if_index;
3135
3136   sw_if_index = ~0;
3137
3138   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3139     {
3140       u32 ri;
3141
3142       /* look up the radv_t  information for this interface */
3143       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3144                                sw_if_index, ~0);
3145
3146       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3147
3148       if (ri != ~0)
3149         {
3150           ip_lookup_main_t *lm = &ip6_main.lookup_main;
3151           ip6_radv_t *radv_info;
3152           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3153
3154           vlib_cli_output (vm, "%U is admin %s\n",
3155                            format_vnet_sw_interface_name, vnm,
3156                            vnet_get_sw_interface (vnm, sw_if_index),
3157                            (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ?
3158                             "up" : "down"));
3159
3160           u32 ai;
3161           u32 *link_scope = 0, *global_scope = 0;
3162           u32 *local_scope = 0, *unknown_scope = 0;
3163           ip_interface_address_t *a;
3164
3165           vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
3166                                    sw_if_index, ~0);
3167           ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
3168
3169           while (ai != (u32) ~ 0)
3170             {
3171               a = pool_elt_at_index (lm->if_address_pool, ai);
3172               ip6_address_t *address =
3173                 ip_interface_address_get_address (lm, a);
3174
3175               if (ip6_address_is_link_local_unicast (address))
3176                 vec_add1 (link_scope, ai);
3177               else if (ip6_address_is_global_unicast (address))
3178                 vec_add1 (global_scope, ai);
3179               else if (ip6_address_is_local_unicast (address))
3180                 vec_add1 (local_scope, ai);
3181               else
3182                 vec_add1 (unknown_scope, ai);
3183
3184               ai = a->next_this_sw_interface;
3185             }
3186
3187           if (vec_len (link_scope))
3188             {
3189               vlib_cli_output (vm, "\tLink-local address(es):\n");
3190               ip6_print_addrs (vm, link_scope);
3191               vec_free (link_scope);
3192             }
3193
3194           if (vec_len (local_scope))
3195             {
3196               vlib_cli_output (vm, "\tLocal unicast address(es):\n");
3197               ip6_print_addrs (vm, local_scope);
3198               vec_free (local_scope);
3199             }
3200
3201           if (vec_len (global_scope))
3202             {
3203               vlib_cli_output (vm, "\tGlobal unicast address(es):\n");
3204               ip6_print_addrs (vm, global_scope);
3205               vec_free (global_scope);
3206             }
3207
3208           if (vec_len (unknown_scope))
3209             {
3210               vlib_cli_output (vm, "\tOther-scope address(es):\n");
3211               ip6_print_addrs (vm, unknown_scope);
3212               vec_free (unknown_scope);
3213             }
3214
3215           vlib_cli_output (vm, "\tJoined group address(es):\n");
3216           ip6_mldp_group_t *m;
3217           /* *INDENT-OFF* */
3218           pool_foreach (m, radv_info->mldp_group_pool,
3219           ({
3220             vlib_cli_output (vm, "\t\t%U\n", format_ip6_address,
3221                              &m->mcast_address);
3222           }));
3223           /* *INDENT-ON* */
3224
3225           vlib_cli_output (vm, "\tAdvertised Prefixes:\n");
3226           ip6_radv_prefix_t *p;
3227           /* *INDENT-OFF* */
3228           pool_foreach (p, radv_info->adv_prefixes_pool,
3229           ({
3230             vlib_cli_output (vm, "\t\tprefix %U,  length %d\n",
3231                              format_ip6_address, &p->prefix, p->prefix_len);
3232           }));
3233           /* *INDENT-ON* */
3234
3235           vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu);
3236           vlib_cli_output (vm, "\tICMP error messages are unlimited\n");
3237           vlib_cli_output (vm, "\tICMP redirects are disabled\n");
3238           vlib_cli_output (vm, "\tICMP unreachables are not sent\n");
3239           vlib_cli_output (vm, "\tND DAD is disabled\n");
3240           //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",);
3241           vlib_cli_output (vm, "\tND advertised reachable time is %d\n",
3242                            radv_info->adv_neighbor_reachable_time_in_msec);
3243           vlib_cli_output (vm,
3244                            "\tND advertised retransmit interval is %d (msec)\n",
3245                            radv_info->
3246                            adv_time_in_msec_between_retransmitted_neighbor_solicitations);
3247
3248           u32 ra_interval = radv_info->max_radv_interval;
3249           u32 ra_interval_min = radv_info->min_radv_interval;
3250           vlib_cli_output (vm,
3251                            "\tND router advertisements are sent every %d seconds (min interval is %d)\n",
3252                            ra_interval, ra_interval_min);
3253           vlib_cli_output (vm,
3254                            "\tND router advertisements live for %d seconds\n",
3255                            radv_info->adv_router_lifetime_in_sec);
3256           vlib_cli_output (vm,
3257                            "\tHosts %s stateless autoconfig for addresses\n",
3258                            (radv_info->adv_managed_flag) ? "use" :
3259                            " don't use");
3260           vlib_cli_output (vm, "\tND router advertisements sent %d\n",
3261                            radv_info->n_advertisements_sent);
3262           vlib_cli_output (vm, "\tND router solicitations received %d\n",
3263                            radv_info->n_solicitations_rcvd);
3264           vlib_cli_output (vm, "\tND router solicitations dropped %d\n",
3265                            radv_info->n_solicitations_dropped);
3266         }
3267       else
3268         {
3269           error = clib_error_return (0, "IPv6 not enabled on interface",
3270                                      format_unformat_error, input);
3271
3272         }
3273     }
3274   return error;
3275 }
3276
3277 /*?
3278  * This command is used to display various IPv6 attributes on a given
3279  * interface.
3280  *
3281  * @cliexpar
3282  * Example of how to display IPv6 settings:
3283  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
3284  * GigabitEthernet2/0/0 is admin up
3285  *         Link-local address(es):
3286  *                 fe80::ab8/64
3287  *         Joined group address(es):
3288  *                 ff02::1
3289  *                 ff02::2
3290  *                 ff02::16
3291  *                 ff02::1:ff00:ab8
3292  *         Advertised Prefixes:
3293  *                 prefix fe80::fe:28ff:fe9c:75b3,  length 64
3294  *         MTU is 1500
3295  *         ICMP error messages are unlimited
3296  *         ICMP redirects are disabled
3297  *         ICMP unreachables are not sent
3298  *         ND DAD is disabled
3299  *         ND advertised reachable time is 0
3300  *         ND advertised retransmit interval is 0 (msec)
3301  *         ND router advertisements are sent every 200 seconds (min interval is 150)
3302  *         ND router advertisements live for 600 seconds
3303  *         Hosts use stateless autoconfig for addresses
3304  *         ND router advertisements sent 19336
3305  *         ND router solicitations received 0
3306  *         ND router solicitations dropped 0
3307  * @cliexend
3308  * Example of output if IPv6 is not enabled on the interface:
3309  * @cliexstart{show ip6 interface GigabitEthernet2/0/0}
3310  * show ip6 interface: IPv6 not enabled on interface
3311  * @cliexend
3312 ?*/
3313 /* *INDENT-OFF* */
3314 VLIB_CLI_COMMAND (show_ip6_interface_command, static) =
3315 {
3316   .path = "show ip6 interface",
3317   .function = show_ip6_interface_cmd,
3318   .short_help = "show ip6 interface <interface>",
3319 };
3320 /* *INDENT-ON* */
3321
3322 clib_error_t *
3323 disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
3324 {
3325   clib_error_t *error = 0;
3326   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3327   u32 ri;
3328
3329   /* look up the radv_t  information for this interface */
3330   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3331                            ~0);
3332   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3333
3334   /* if not created - do nothing */
3335   if (ri != ~0)
3336     {
3337       vnet_main_t *vnm = vnet_get_main ();
3338       ip6_radv_t *radv_info;
3339
3340       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3341
3342       /* check radv_info ref count for other ip6 addresses on this interface */
3343       /* This implicitly excludes the link local address */
3344       if (radv_info->ref_count == 0)
3345         {
3346           /* essentially "disables" ipv6 on this interface */
3347           error = ip6_add_del_interface_address (vm, sw_if_index,
3348                                                  &radv_info->
3349                                                  link_local_address, 128,
3350                                                  1 /* is_del */ );
3351
3352           ip6_neighbor_sw_interface_add_del (vnm, sw_if_index,
3353                                              0 /* is_add */ );
3354           ip6_mfib_interface_enable_disable (sw_if_index, 0);
3355         }
3356     }
3357   return error;
3358 }
3359
3360 int
3361 ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index)
3362 {
3363   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3364   u32 ri = ~0;
3365
3366   /* look up the radv_t  information for this interface */
3367   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3368                            ~0);
3369
3370   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3371
3372   return ri != ~0;
3373 }
3374
3375 clib_error_t *
3376 enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index)
3377 {
3378   clib_error_t *error = 0;
3379   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3380   u32 ri;
3381   int is_add = 1;
3382
3383   /* look up the radv_t  information for this interface */
3384   vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index,
3385                            ~0);
3386
3387   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3388
3389   /* if not created yet */
3390   if (ri == ~0)
3391     {
3392       vnet_main_t *vnm = vnet_get_main ();
3393       vnet_sw_interface_t *sw_if0;
3394
3395       sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index);
3396       if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
3397         {
3398           ethernet_interface_t *eth_if0;
3399
3400           eth_if0 =
3401             ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
3402           if (eth_if0)
3403             {
3404               /* create radv_info. for this interface.  This holds all the info needed for router adverts */
3405               ri =
3406                 ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add);
3407
3408               if (ri != ~0)
3409                 {
3410                   ip6_radv_t *radv_info;
3411                   ip6_address_t link_local_address;
3412
3413                   radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3414
3415                   ip6_link_local_address_from_ethernet_mac_address
3416                     (&link_local_address, eth_if0->address);
3417
3418                   sw_if0 = vnet_get_sw_interface (vnm, sw_if_index);
3419                   if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB)
3420                     {
3421                       /* make up  an interface id */
3422                       md5_context_t m;
3423                       u8 digest[16];
3424
3425                       link_local_address.as_u64[0] = radv_info->randomizer;
3426
3427                       md5_init (&m);
3428                       md5_add (&m, &link_local_address, 16);
3429                       md5_finish (&m, digest);
3430
3431                       clib_memcpy (&link_local_address, digest, 16);
3432
3433                       radv_info->randomizer = link_local_address.as_u64[0];
3434
3435                       link_local_address.as_u64[0] =
3436                         clib_host_to_net_u64 (0xFE80000000000000ULL);
3437                       /* clear u bit */
3438                       link_local_address.as_u8[8] &= 0xfd;
3439                     }
3440
3441                   ip6_mfib_interface_enable_disable (sw_if_index, 1);
3442
3443                   /* essentially "enables" ipv6 on this interface */
3444                   error = ip6_add_del_interface_address (vm, sw_if_index,
3445                                                          &link_local_address,
3446                                                          128
3447                                                          /* address width */ ,
3448                                                          0 /* is_del */ );
3449
3450                   if (error)
3451                     ip6_neighbor_sw_interface_add_del (vnm, sw_if_index,
3452                                                        !is_add);
3453                   else
3454                     {
3455                       radv_info->link_local_address = link_local_address;
3456                     }
3457                 }
3458             }
3459         }
3460     }
3461   return error;
3462 }
3463
3464 static clib_error_t *
3465 enable_ip6_interface_cmd (vlib_main_t * vm,
3466                           unformat_input_t * input, vlib_cli_command_t * cmd)
3467 {
3468   vnet_main_t *vnm = vnet_get_main ();
3469   clib_error_t *error = 0;
3470   u32 sw_if_index;
3471
3472   sw_if_index = ~0;
3473
3474   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3475     {
3476       enable_ip6_interface (vm, sw_if_index);
3477     }
3478   else
3479     {
3480       error = clib_error_return (0, "unknown interface\n'",
3481                                  format_unformat_error, input);
3482
3483     }
3484   return error;
3485 }
3486
3487 /*?
3488  * This command is used to enable IPv6 on a given interface.
3489  *
3490  * @cliexpar
3491  * Example of how enable IPv6 on a given interface:
3492  * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0}
3493 ?*/
3494 /* *INDENT-OFF* */
3495 VLIB_CLI_COMMAND (enable_ip6_interface_command, static) =
3496 {
3497   .path = "enable ip6 interface",
3498   .function = enable_ip6_interface_cmd,
3499   .short_help = "enable ip6 interface <interface>",
3500 };
3501 /* *INDENT-ON* */
3502
3503 static clib_error_t *
3504 disable_ip6_interface_cmd (vlib_main_t * vm,
3505                            unformat_input_t * input, vlib_cli_command_t * cmd)
3506 {
3507   vnet_main_t *vnm = vnet_get_main ();
3508   clib_error_t *error = 0;
3509   u32 sw_if_index;
3510
3511   sw_if_index = ~0;
3512
3513   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3514     {
3515       error = disable_ip6_interface (vm, sw_if_index);
3516     }
3517   else
3518     {
3519       error = clib_error_return (0, "unknown interface\n'",
3520                                  format_unformat_error, input);
3521
3522     }
3523   return error;
3524 }
3525
3526 /*?
3527  * This command is used to disable IPv6 on a given interface.
3528  *
3529  * @cliexpar
3530  * Example of how disable IPv6 on a given interface:
3531  * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0}
3532 ?*/
3533 /* *INDENT-OFF* */
3534 VLIB_CLI_COMMAND (disable_ip6_interface_command, static) =
3535 {
3536   .path = "disable ip6 interface",
3537   .function = disable_ip6_interface_cmd,
3538   .short_help = "disable ip6 interface <interface>",
3539 };
3540 /* *INDENT-ON* */
3541
3542 /*?
3543  * This command is used to configure the neighbor discovery
3544  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
3545  * command to display some of the current neighbor discovery parameters
3546  * on a given interface. This command has three formats:
3547  *
3548  *
3549  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
3550  *
3551  * '<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>'
3552  *
3553  * Where:
3554  *
3555  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
3556  * router-advertisement messages to use stateful address
3557  * auto-configuration to obtain address information (sets the M-bit).
3558  * Default is the M-bit is not set and the '<em>no</em>' option
3559  * returns it to this default state.
3560  *
3561  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
3562  * router-advertisement messages that hosts use stateful auto
3563  * configuration to obtain nonaddress related information (sets
3564  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
3565  * option returns it to this default state.
3566  *
3567  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
3568  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
3569  * router-advertisement messages.
3570  *
3571  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
3572  * optional source link-layer address in the ICMPv6 router-advertisement
3573  * messages. Default is to include the optional source link-layer address
3574  * and the '<em>no</em>' option returns it to this default state.
3575  *
3576  * <em>[no] ra-send-unicast</em> - Use the source address of the
3577  * router-solicitation message if availiable. The default is to use
3578  * multicast address of all nodes, and the '<em>no</em>' option returns
3579  * it to this default state.
3580  *
3581  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
3582  * default router in ICMPv6 router-advertisement messages. The range is
3583  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
3584  * '<em><max-interval></em>'. The default value is 600 seconds and the
3585  * '<em>no</em>' option returns it to this default value.
3586  *
3587  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
3588  * router-advertisement messages sent and the interval between each
3589  * message. Range for count is 1 - 3 and default is 3. Range for interval
3590  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
3591  * returns both to their default value.
3592  *
3593  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
3594  * interval between sending ICMPv6 router-advertisement messages. The
3595  * range for max-interval is from 4 to 200 seconds. min-interval can not
3596  * be more than 75% of max-interval. If not set, min-interval will be
3597  * set to 75% of max-interval. The range for min-interval is from 3 to
3598  * 150 seconds.  The '<em>no</em>' option returns both to their default
3599  * value.
3600  *
3601  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
3602  * The '<em>no</em>' options implies to start (or restart) sending
3603  * ICMPv6 router-advertisement messages.
3604  *
3605  *
3606  * <b>Format 2 - Prefix Options:</b>
3607  *
3608  * '<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>'
3609  *
3610  * Where:
3611  *
3612  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
3613  *
3614  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
3615  * length of time in seconds during what the prefix is valid for the purpose of
3616  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
3617  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
3618  * length of time in seconds during what addresses generated from the prefix remain
3619  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
3620  *
3621  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
3622  * are inifinte, no timeout.
3623  *
3624  * <em>no-advertise</em> - Do not send full router address in prefix
3625  * advertisement. Default is to advertise (i.e. - This flag is off by default).
3626  *
3627  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
3628  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
3629  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
3630  *
3631  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
3632  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
3633  *
3634  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
3635  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
3636  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
3637  * the L-bit.
3638  *
3639  *
3640  * <b>Format 3: - Default of Prefix:</b>
3641  *
3642  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
3643  *
3644  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
3645  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
3646  * is ignored and the prefix is deleted.
3647  *
3648  *
3649  * @cliexpar
3650  * Example of how set a router advertisement option:
3651  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
3652  * Example of how to add a prefix:
3653  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
3654  * Example of how to delete a prefix:
3655  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
3656 ?*/
3657 /* *INDENT-OFF* */
3658 VLIB_CLI_COMMAND (ip6_nd_command, static) =
3659 {
3660   .path = "ip6 nd",
3661   .short_help = "ip6 nd <interface> ...",
3662   .function = ip6_neighbor_cmd,
3663 };
3664 /* *INDENT-ON* */
3665
3666 clib_error_t *
3667 set_ip6_link_local_address (vlib_main_t * vm,
3668                             u32 sw_if_index, ip6_address_t * address)
3669 {
3670   clib_error_t *error = 0;
3671   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3672   u32 ri;
3673   ip6_radv_t *radv_info;
3674   vnet_main_t *vnm = vnet_get_main ();
3675
3676   if (!ip6_address_is_link_local_unicast (address))
3677     {
3678       vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_LINK_LOCAL;
3679       return (error = clib_error_return (0, "address not link-local",
3680                                          format_unformat_error));
3681     }
3682
3683   /* call enable ipv6  */
3684   enable_ip6_interface (vm, sw_if_index);
3685
3686   ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3687
3688   if (ri != ~0)
3689     {
3690       radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3691
3692       /* save if link local address (overwrite default) */
3693
3694       /* delete the old one */
3695       error = ip6_add_del_interface_address (vm, sw_if_index,
3696                                              &radv_info->link_local_address,
3697                                              128, 1 /* is_del */ );
3698
3699       if (!error)
3700         {
3701           /* add the new one */
3702           error = ip6_add_del_interface_address (vm, sw_if_index,
3703                                                  address, 128,
3704                                                  0 /* is_del */ );
3705
3706           if (!error)
3707             {
3708               radv_info->link_local_address = *address;
3709             }
3710         }
3711     }
3712   else
3713     {
3714       vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED;
3715       error = clib_error_return (0, "ip6 not enabled for interface",
3716                                  format_unformat_error);
3717     }
3718   return error;
3719 }
3720
3721 clib_error_t *
3722 set_ip6_link_local_address_cmd (vlib_main_t * vm,
3723                                 unformat_input_t * input,
3724                                 vlib_cli_command_t * cmd)
3725 {
3726   vnet_main_t *vnm = vnet_get_main ();
3727   clib_error_t *error = 0;
3728   u32 sw_if_index;
3729   ip6_address_t ip6_addr;
3730
3731   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
3732     {
3733       /* get the rest of the command */
3734       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3735         {
3736           if (unformat (input, "%U", unformat_ip6_address, &ip6_addr))
3737             break;
3738           else
3739             return (unformat_parse_error (input));
3740         }
3741     }
3742   error = set_ip6_link_local_address (vm, sw_if_index, &ip6_addr);
3743   return error;
3744 }
3745
3746 /*?
3747  * This command is used to assign an IPv6 Link-local address to an
3748  * interface. This command will enable IPv6 on an interface if it
3749  * is not already enabled. Use the '<em>show ip6 interface</em>' command
3750  * to display the assigned Link-local address.
3751  *
3752  * @cliexpar
3753  * Example of how to assign an IPv6 Link-local address to an interface:
3754  * @cliexcmd{set ip6 link-local address GigabitEthernet2/0/0 FE80::AB8}
3755 ?*/
3756 /* *INDENT-OFF* */
3757 VLIB_CLI_COMMAND (set_ip6_link_local_address_command, static) =
3758 {
3759   .path = "set ip6 link-local address",
3760   .short_help = "set ip6 link-local address <interface> <ip6-address>",
3761   .function = set_ip6_link_local_address_cmd,
3762 };
3763 /* *INDENT-ON* */
3764
3765 /**
3766  * @brief callback when an interface address is added or deleted
3767  */
3768 static void
3769 ip6_neighbor_add_del_interface_address (ip6_main_t * im,
3770                                         uword opaque,
3771                                         u32 sw_if_index,
3772                                         ip6_address_t * address,
3773                                         u32 address_length,
3774                                         u32 if_address_index, u32 is_delete)
3775 {
3776   vnet_main_t *vnm = vnet_get_main ();
3777   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3778   u32 ri;
3779   vlib_main_t *vm = vnm->vlib_main;
3780   ip6_radv_t *radv_info;
3781   ip6_address_t a;
3782
3783   /* create solicited node multicast address for this interface adddress */
3784   ip6_set_solicited_node_multicast_address (&a, 0);
3785
3786   a.as_u8[0xd] = address->as_u8[0xd];
3787   a.as_u8[0xe] = address->as_u8[0xe];
3788   a.as_u8[0xf] = address->as_u8[0xf];
3789
3790   if (!is_delete)
3791     {
3792       /* try to  create radv_info - does nothing if ipv6 already enabled */
3793       enable_ip6_interface (vm, sw_if_index);
3794
3795       /* look up the radv_t  information for this interface */
3796       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3797                                sw_if_index, ~0);
3798       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3799       if (ri != ~0)
3800         {
3801           /* get radv_info */
3802           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3803
3804           /* add address */
3805           if (!ip6_address_is_link_local_unicast (address))
3806             radv_info->ref_count++;
3807
3808           ip6_neighbor_add_mld_prefix (radv_info, &a);
3809         }
3810     }
3811   else
3812     {
3813
3814       /* delete */
3815       /* look up the radv_t  information for this interface */
3816       vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index,
3817                                sw_if_index, ~0);
3818       ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index];
3819
3820       if (ri != ~0)
3821         {
3822           /* get radv_info */
3823           radv_info = pool_elt_at_index (nm->if_radv_pool, ri);
3824
3825           ip6_neighbor_del_mld_prefix (radv_info, &a);
3826
3827           /* if interface up send MLDP "report" */
3828           radv_info->all_routers_mcast = 0;
3829
3830           /* add address */
3831           if (!ip6_address_is_link_local_unicast (address))
3832             radv_info->ref_count--;
3833         }
3834       /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */
3835       disable_ip6_interface (vm, sw_if_index);
3836     }
3837 }
3838
3839 clib_error_t *
3840 ip6_set_neighbor_limit (u32 neighbor_limit)
3841 {
3842   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3843
3844   nm->limit_neighbor_cache_size = neighbor_limit;
3845   return 0;
3846 }
3847
3848 static clib_error_t *
3849 ip6_neighbor_init (vlib_main_t * vm)
3850 {
3851   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3852   ip6_main_t *im = &ip6_main;
3853
3854   mhash_init (&nm->neighbor_index_by_key,
3855               /* value size */ sizeof (uword),
3856               /* key size */ sizeof (ip6_neighbor_key_t));
3857
3858   icmp6_register_type (vm, ICMP6_neighbor_solicitation,
3859                        ip6_icmp_neighbor_solicitation_node.index);
3860   icmp6_register_type (vm, ICMP6_neighbor_advertisement,
3861                        ip6_icmp_neighbor_advertisement_node.index);
3862   icmp6_register_type (vm, ICMP6_router_solicitation,
3863                        ip6_icmp_router_solicitation_node.index);
3864   icmp6_register_type (vm, ICMP6_router_advertisement,
3865                        ip6_icmp_router_advertisement_node.index);
3866
3867   /* handler node for ip6 neighbor discovery events and timers */
3868   vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node);
3869
3870   /* add call backs */
3871   ip6_add_del_interface_address_callback_t cb;
3872   memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t));
3873
3874   /* when an interface address changes... */
3875   cb.function = ip6_neighbor_add_del_interface_address;
3876   cb.function_opaque = 0;
3877   vec_add1 (im->add_del_interface_address_callbacks, cb);
3878
3879   mhash_init (&nm->pending_resolutions_by_address,
3880               /* value size */ sizeof (uword),
3881               /* key size */ sizeof (ip6_address_t));
3882
3883   mhash_init (&nm->mac_changes_by_address,
3884               /* value size */ sizeof (uword),
3885               /* key size */ sizeof (ip6_address_t));
3886
3887   /* default, configurable */
3888   nm->limit_neighbor_cache_size = 50000;
3889
3890 #if 0
3891   /* $$$$ Hack fix for today */
3892   vec_validate_init_empty
3893     (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ );
3894 #endif
3895
3896   return 0;
3897 }
3898
3899 VLIB_INIT_FUNCTION (ip6_neighbor_init);
3900
3901
3902 void
3903 vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm,
3904                                              void *address_arg,
3905                                              uword node_index,
3906                                              uword type_opaque, uword data)
3907 {
3908   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3909   ip6_address_t *address = address_arg;
3910   uword *p;
3911   pending_resolution_t *pr;
3912
3913   pool_get (nm->pending_resolutions, pr);
3914
3915   pr->next_index = ~0;
3916   pr->node_index = node_index;
3917   pr->type_opaque = type_opaque;
3918   pr->data = data;
3919
3920   p = mhash_get (&nm->pending_resolutions_by_address, address);
3921   if (p)
3922     {
3923       /* Insert new resolution at the head of the list */
3924       pr->next_index = p[0];
3925       mhash_unset (&nm->pending_resolutions_by_address, address, 0);
3926     }
3927
3928   mhash_set (&nm->pending_resolutions_by_address, address,
3929              pr - nm->pending_resolutions, 0 /* old value */ );
3930 }
3931
3932 int
3933 vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
3934                                   void *data_callback,
3935                                   u32 pid,
3936                                   void *address_arg,
3937                                   uword node_index,
3938                                   uword type_opaque, uword data, int is_add)
3939 {
3940   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
3941   ip6_address_t *address = address_arg;
3942
3943   /* Try to find an existing entry */
3944   u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address);
3945   u32 *p = first;
3946   pending_resolution_t *mc;
3947   while (p && *p != ~0)
3948     {
3949       mc = pool_elt_at_index (nm->mac_changes, *p);
3950       if (mc->node_index == node_index && mc->type_opaque == type_opaque
3951           && mc->pid == pid)
3952         break;
3953       p = &mc->next_index;
3954     }
3955
3956   int found = p && *p != ~0;
3957   if (is_add)
3958     {
3959       if (found)
3960         return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
3961
3962       pool_get (nm->mac_changes, mc);
3963       *mc = (pending_resolution_t)
3964       {
3965       .next_index = ~0,.node_index = node_index,.type_opaque =
3966           type_opaque,.data = data,.data_callback = data_callback,.pid =
3967           pid,};
3968
3969       /* Insert new resolution at the end of the list */
3970       u32 new_idx = mc - nm->mac_changes;
3971       if (p)
3972         p[0] = new_idx;
3973       else
3974         mhash_set (&nm->mac_changes_by_address, address, new_idx, 0);
3975     }
3976   else
3977     {
3978       if (!found)
3979         return VNET_API_ERROR_NO_SUCH_ENTRY;
3980
3981       /* Clients may need to clean up pool entries, too */
3982       void (*fp) (u32, u8 *) = data_callback;
3983       if (fp)
3984         (*fp) (mc->data, 0 /* no new mac addrs */ );
3985
3986       /* Remove the entry from the list and delete the entry */
3987       *p = mc->next_index;
3988       pool_put (nm->mac_changes, mc);
3989
3990       /* Remove from hash if we deleted the last entry */
3991       if (*p == ~0 && p == first)
3992         mhash_unset (&nm->mac_changes_by_address, address, 0);
3993     }
3994   return 0;
3995 }
3996
3997 int
3998 vnet_ip6_nd_term (vlib_main_t * vm,
3999                   vlib_node_runtime_t * node,
4000                   vlib_buffer_t * p0,
4001                   ethernet_header_t * eth,
4002                   ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
4003 {
4004   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4005   icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
4006   pending_resolution_t *mc;
4007
4008   ndh = ip6_next_header (ip);
4009   if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
4010       ndh->icmp.type != ICMP6_neighbor_advertisement)
4011     return 0;
4012
4013   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
4014                      (p0->flags & VLIB_BUFFER_IS_TRACED)))
4015     {
4016       u8 *t0 = vlib_add_trace (vm, node, p0,
4017                                sizeof (icmp6_input_trace_t));
4018       clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
4019     }
4020
4021   /* Check if anyone want ND events for L2 BDs */
4022   uword *p = mhash_get (&nm->mac_changes_by_address, &ip6a_zero);
4023   if (p && !ip6_address_is_link_local_unicast (&ip->src_address))
4024     {
4025       u32 next_index = p[0];
4026       while (next_index != (u32) ~ 0)
4027         {
4028           int (*fp) (u32, u8 *, u32, ip6_address_t *);
4029           int rv = 1;
4030           mc = pool_elt_at_index (nm->mac_changes, next_index);
4031           fp = mc->data_callback;
4032           /* Call the callback, return 1 to suppress dup events */
4033           if (fp)
4034             rv = (*fp) (mc->data,
4035                         eth->src_address, sw_if_index, &ip->src_address);
4036           /* Signal the resolver process */
4037           if (rv == 0)
4038             vlib_process_signal_event (vm, mc->node_index,
4039                                        mc->type_opaque, mc->data);
4040           next_index = mc->next_index;
4041         }
4042     }
4043
4044   /* Check if MAC entry exsist for solicited target IP */
4045   if (ndh->icmp.type == ICMP6_neighbor_solicitation)
4046     {
4047       icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
4048       l2_bridge_domain_t *bd_config;
4049       u8 *macp;
4050
4051       opt = (void *) (ndh + 1);
4052       if ((opt->header.type !=
4053            ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
4054           (opt->header.n_data_u64s != 1))
4055         return 0;               /* source link layer address option not present */
4056
4057       bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
4058       macp =
4059         (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
4060       if (macp)
4061         {                       /* found ip-mac entry, generate eighbor advertisement response */
4062           int bogus_length;
4063           vlib_node_runtime_t *error_node =
4064             vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
4065           ip->dst_address = ip->src_address;
4066           ip->src_address = ndh->target_address;
4067           ip->hop_limit = 255;
4068           opt->header.type =
4069             ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
4070           clib_memcpy (opt->ethernet_address, macp, 6);
4071           ndh->icmp.type = ICMP6_neighbor_advertisement;
4072           ndh->advertisement_flags = clib_host_to_net_u32
4073             (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
4074              ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
4075           ndh->icmp.checksum = 0;
4076           ndh->icmp.checksum =
4077             ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
4078           clib_memcpy (eth->dst_address, eth->src_address, 6);
4079           clib_memcpy (eth->src_address, macp, 6);
4080           vlib_error_count (vm, error_node->node_index,
4081                             ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
4082           return 1;
4083         }
4084     }
4085
4086   return 0;
4087
4088 }
4089
4090 int
4091 ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del)
4092 {
4093   u32 fib_index;
4094
4095   fib_prefix_t pfx = {
4096     .fp_len = 128,
4097     .fp_proto = FIB_PROTOCOL_IP6,
4098     .fp_addr = {
4099                 .ip6 = *addr,
4100                 },
4101   };
4102   ip46_address_t nh = {
4103     .ip6 = *addr,
4104   };
4105
4106   fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
4107
4108   if (~0 == fib_index)
4109     return VNET_API_ERROR_NO_SUCH_FIB;
4110
4111   if (is_del)
4112     {
4113       fib_table_entry_path_remove (fib_index,
4114                                    &pfx,
4115                                    FIB_SOURCE_IP6_ND_PROXY,
4116                                    FIB_PROTOCOL_IP6,
4117                                    &nh,
4118                                    sw_if_index,
4119                                    ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
4120       /* flush the ND cache of this address if it's there */
4121       vnet_unset_ip6_ethernet_neighbor (vlib_get_main (),
4122                                         sw_if_index, addr, NULL, 0);
4123     }
4124   else
4125     {
4126       fib_table_entry_path_add (fib_index,
4127                                 &pfx,
4128                                 FIB_SOURCE_IP6_ND_PROXY,
4129                                 FIB_ENTRY_FLAG_NONE,
4130                                 FIB_PROTOCOL_IP6,
4131                                 &nh,
4132                                 sw_if_index,
4133                                 ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
4134     }
4135   return (0);
4136 }
4137
4138 static clib_error_t *
4139 set_ip6_nd_proxy_cmd (vlib_main_t * vm,
4140                       unformat_input_t * input, vlib_cli_command_t * cmd)
4141 {
4142   vnet_main_t *vnm = vnet_get_main ();
4143   clib_error_t *error = 0;
4144   ip6_address_t addr;
4145   u32 sw_if_index;
4146   u8 is_del = 0;
4147
4148   if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
4149     {
4150       /* get the rest of the command */
4151       while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
4152         {
4153           if (unformat (input, "%U", unformat_ip6_address, &addr))
4154             break;
4155           else if (unformat (input, "delete") || unformat (input, "del"))
4156             is_del = 1;
4157           else
4158             return (unformat_parse_error (input));
4159         }
4160     }
4161
4162   ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del);
4163
4164   return error;
4165 }
4166
4167 /* *INDENT-OFF* */
4168 VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) =
4169 {
4170   .path = "set ip6 nd proxy",
4171   .short_help = "set ip6 nd proxy <HOST> <INTERFACE>",
4172   .function = set_ip6_nd_proxy_cmd,
4173 };
4174 /* *INDENT-ON* */
4175
4176 void
4177 ethernet_ndp_change_mac (u32 sw_if_index)
4178 {
4179   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
4180   ip6_neighbor_t *n;
4181
4182   /* *INDENT-OFF* */
4183   pool_foreach (n, nm->neighbor_pool,
4184   ({
4185     if (n->key.sw_if_index == sw_if_index)
4186       {
4187         adj_nbr_walk_nh6 (sw_if_index,
4188                           &n->key.ip6_address,
4189                           ip6_nd_mk_complete_walk, n);
4190       }
4191   }));
4192   /* *INDENT-ON* */
4193 }
4194
4195 /*
4196  * fd.io coding-style-patch-verification: ON
4197  *
4198  * Local Variables:
4199  * eval: (c-set-style "gnu")
4200  * End:
4201  */