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