src/vnet/ip/ip6_neighbor.c

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