src/vnet/ip6-nd/ip6_ra.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/ip6-nd/ip6_ra.h>
  19
  20 #include <vnet/ip/ip.h>
  21 #include <vnet/ip-neighbor/ip_neighbor_dp.h>
  22
  23 #include <vnet/fib/ip6_fib.h>
  24 #include <vnet/ip/ip6_link.h>
  25
  26 /**
  27  * @file
  28  * @brief IPv6 Router Advertisements.
  29  *
  30  * The files contains the API and CLI code for managing IPv6 RAs
  31  */
  32
  33 /* *INDENT-OFF* */
  34 /* Router solicitation packet format for ethernet. */
  35 typedef CLIB_PACKED (struct
  36 {
  37     ip6_header_t ip;
  38     icmp6_neighbor_discovery_header_t neighbor;
  39     icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
  40     link_layer_option;
  41 }) icmp6_router_solicitation_header_t;
  42
  43 /* router advertisement packet format for ethernet. */
  44 typedef CLIB_PACKED (struct
  45 {
  46   ip6_header_t ip;
  47   icmp6_router_advertisement_header_t router;
  48   icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
  49   link_layer_option;
  50   icmp6_neighbor_discovery_mtu_option_t mtu_option;
  51   icmp6_neighbor_discovery_prefix_information_option_t
  52   prefix[0];
  53 }) icmp6_router_advertisement_packet_t;
  54 /* *INDENT-ON* */
  55
  56 #define DEF_MAX_RADV_INTERVAL 200
  57 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
  58 #define DEF_CURR_HOP_LIMIT  64
  59 #define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
  60 #define MAX_DEF_RTR_LIFETIME   9000
  61
  62 #define MAX_INITIAL_RTR_ADVERT_INTERVAL   16    /* seconds */
  63 #define MAX_INITIAL_RTR_ADVERTISEMENTS        3 /*transmissions */
  64 #define MIN_DELAY_BETWEEN_RAS                              3    /* seconds */
  65 #define MAX_DELAY_BETWEEN_RAS                    1800   /* seconds */
  66 #define MAX_RA_DELAY_TIME                                          .5   /* seconds */
  67
  68 /* advertised prefix option */
  69 typedef struct
  70 {
  71   /* basic advertised information */
  72   ip6_address_t prefix;
  73   u8 prefix_len;
  74   int adv_on_link_flag;
  75   int adv_autonomous_flag;
  76   u32 adv_valid_lifetime_in_secs;
  77   u32 adv_pref_lifetime_in_secs;
  78
  79   /* advertised values are computed from these times if decrementing */
  80   f64 valid_lifetime_expires;
  81   f64 pref_lifetime_expires;
  82
  83   /* local information */
  84   int enabled;
  85   int deprecated_prefix_flag;
  86   int decrement_lifetime_flag;
  87
  88 #define MIN_ADV_VALID_LIFETIME 7203     /* seconds */
  89 #define DEF_ADV_VALID_LIFETIME  2592000
  90 #define DEF_ADV_PREF_LIFETIME 604800
  91
  92   /* extensions are added here, mobile, DNS etc.. */
  93 } ip6_radv_prefix_t;
  94
  95 typedef struct ip6_ra_t_
  96 {
  97   /* advertised config information, zero means unspecified  */
  98   u8 curr_hop_limit;
  99   int adv_managed_flag;
 100   int adv_other_flag;
 101   u16 adv_router_lifetime_in_sec;
 102   u32 adv_neighbor_reachable_time_in_msec;
 103   u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
 104
 105   /* mtu option */
 106   u32 adv_link_mtu;
 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 ref_count;
 117
 118   /* prefix option */
 119   ip6_radv_prefix_t *adv_prefixes_pool;
 120
 121   /* Hash table mapping address to index in interface advertised  prefix pool. */
 122   mhash_t address_to_prefix_index;
 123
 124   f64 max_radv_interval;
 125   f64 min_radv_interval;
 126   f64 min_delay_between_radv;
 127   f64 max_delay_between_radv;
 128   f64 max_rtr_default_lifetime;
 129
 130   f64 last_radv_time;
 131   f64 last_multicast_time;
 132   f64 next_multicast_time;
 133
 134
 135   u32 initial_adverts_count;
 136   f64 initial_adverts_interval;
 137   u32 initial_adverts_sent;
 138
 139   /* stats */
 140   u32 n_advertisements_sent;
 141   u32 n_solicitations_rcvd;
 142   u32 n_solicitations_dropped;
 143
 144   /* router solicitations sending state */
 145   u8 keep_sending_rs;           /* when true then next fields are valid */
 146   icmp6_send_router_solicitation_params_t params;
 147   f64 sleep_interval;
 148   f64 due_time;
 149   u32 n_left;
 150   f64 start_time;
 151   vlib_buffer_t *buffer;
 152
 153   u32 seed;
 154
 155 } ip6_ra_t;
 156
 157 static ip6_link_delegate_id_t ip6_ra_delegate_id;
 158 static ip6_ra_t *ip6_ra_pool;
 159
 160
 161 /* vector of registered RA report listeners */
 162 static ip6_ra_report_notify_t *ip6_ra_listeners;
 163
 164 static int ip6_ra_publish (ip6_ra_report_t * r);
 165
 166 void
 167 ip6_ra_report_register (ip6_ra_report_notify_t fn)
 168 {
 169   ip6_ra_report_notify_t *listener;
 170   vec_foreach (listener, ip6_ra_listeners)
 171   {
 172     if (*listener == fn)
 173       return;
 174   }
 175
 176   vec_add1 (ip6_ra_listeners, fn);
 177 }
 178
 179 void
 180 ip6_ra_report_unregister (ip6_ra_report_notify_t fn)
 181 {
 182   u32 ii;
 183
 184   vec_foreach_index (ii, ip6_ra_listeners)
 185   {
 186     if (ip6_ra_listeners[ii] == fn)
 187       {
 188         vec_del1 (ip6_ra_listeners, ii);
 189         break;
 190       }
 191   }
 192 }
 193
 194 static inline ip6_ra_t *
 195 ip6_ra_get_itf (u32 sw_if_index)
 196 {
 197   index_t rai;
 198
 199   rai = ip6_link_delegate_get (sw_if_index, ip6_ra_delegate_id);
 200
 201   if (INDEX_INVALID != rai)
 202     return (pool_elt_at_index (ip6_ra_pool, rai));
 203
 204   return (NULL);
 205 }
 206
 207 /* for "syslogging" - use elog for now */
 208 #define foreach_log_level            \
 209   _ (DEBUG, "DEBUG")                 \
 210   _ (INFO, "INFORMATION")            \
 211   _ (NOTICE, "NOTICE")               \
 212   _ (WARNING, "WARNING")             \
 213   _ (ERR, "ERROR")                   \
 214   _ (CRIT, "CRITICAL")               \
 215   _ (ALERT, "ALERT")                 \
 216   _ (EMERG,  "EMERGENCY")
 217
 218 typedef enum
 219 {
 220 #define _(f,s) LOG_##f,
 221   foreach_log_level
 222 #undef _
 223 } log_level_t;
 224
 225 static char *log_level_strings[] = {
 226 #define _(f,s) s,
 227   foreach_log_level
 228 #undef _
 229 };
 230
 231 static int logmask = 1 << LOG_DEBUG;
 232
 233 static void
 234 ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
 235 {
 236   /* just use elog for now */
 237   u8 *what;
 238   va_list va;
 239
 240   if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
 241     return;
 242
 243   va_start (va, fmt);
 244   if (fmt)
 245     {
 246       what = va_format (0, fmt, &va);
 247
 248       ELOG_TYPE_DECLARE (e) =
 249       {
 250       .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
 251       struct
 252       {
 253         u32 s[2];
 254       } *ed;
 255       ed = ELOG_DATA (&vm->elog_main, e);
 256       ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
 257       ed->s[1] = elog_string (&vm->elog_main, (char *) what);
 258     }
 259   va_end (va);
 260   return;
 261 }
 262
 263 /* ipv6 neighbor discovery - router advertisements */
 264 typedef enum
 265 {
 266   ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
 267   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
 268   ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
 269   ICMP6_ROUTER_SOLICITATION_N_NEXT,
 270 } icmp6_router_solicitation_or_advertisement_next_t;
 271
 272 static_always_inline uword
 273 icmp6_router_solicitation (vlib_main_t * vm,
 274                            vlib_node_runtime_t * node, vlib_frame_t * frame)
 275 {
 276   vnet_main_t *vnm = vnet_get_main ();
 277   ip6_main_t *im = &ip6_main;
 278   uword n_packets = frame->n_vectors;
 279   u32 *from, *to_next;
 280   u32 n_left_from, n_left_to_next, next_index;
 281   u32 n_advertisements_sent = 0;
 282   int bogus_length;
 283
 284   icmp6_neighbor_discovery_option_type_t option_type;
 285
 286   vlib_node_runtime_t *error_node =
 287     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
 288
 289   from = vlib_frame_vector_args (frame);
 290   n_left_from = n_packets;
 291   next_index = node->cached_next_index;
 292
 293   if (node->flags & VLIB_NODE_FLAG_TRACE)
 294     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
 295                                    /* stride */ 1,
 296                                    sizeof (icmp6_input_trace_t));
 297
 298   /* source may append his LL address */
 299   option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
 300
 301   while (n_left_from > 0)
 302     {
 303       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 304
 305       while (n_left_from > 0 && n_left_to_next > 0)
 306         {
 307           vlib_buffer_t *p0;
 308           ip6_header_t *ip0;
 309           ip6_ra_t *radv_info = NULL;
 310
 311           icmp6_neighbor_discovery_header_t *h0;
 312           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
 313
 314           u32 bi0, options_len0, sw_if_index0, next0, error0;
 315           u32 is_solicitation = 1, is_dropped = 0;
 316           u32 is_unspecified, is_link_local;
 317
 318           bi0 = to_next[0] = from[0];
 319
 320           from += 1;
 321           to_next += 1;
 322           n_left_from -= 1;
 323           n_left_to_next -= 1;
 324
 325           p0 = vlib_get_buffer (vm, bi0);
 326           ip0 = vlib_buffer_get_current (p0);
 327           h0 = ip6_next_header (ip0);
 328           options_len0 =
 329             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
 330           is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
 331           is_link_local =
 332             ip6_address_is_link_local_unicast (&ip0->src_address);
 333
 334           error0 = ICMP6_ERROR_NONE;
 335           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
 336
 337           /* check if solicitation  (not from nd_timer node) */
 338           if (ip6_address_is_unspecified (&ip0->dst_address))
 339             is_solicitation = 0;
 340
 341           /* Check that source address is unspecified, link-local or else on-link. */
 342           if (!is_unspecified && !is_link_local)
 343             {
 344               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
 345
 346               if (ADJ_INDEX_INVALID != src_adj_index0)
 347                 {
 348                   ip_adjacency_t *adj0 = adj_get (src_adj_index0);
 349
 350                   error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
 351                             ?
 352                             ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
 353                             : error0);
 354                 }
 355               else
 356                 {
 357                   error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
 358                 }
 359             }
 360
 361           /* check for source LL option and process */
 362           o0 = (void *) (h0 + 1);
 363           o0 = ((options_len0 == 8
 364                  && o0->header.type == option_type
 365                  && o0->header.n_data_u64s == 1) ? o0 : 0);
 366
 367           /* if src address unspecified IGNORE any options */
 368           if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
 369                             !is_unspecified && !is_link_local))
 370             {
 371               ip_neighbor_learn_t learn = {
 372                 .type = IP46_TYPE_IP6,
 373                 .sw_if_index = sw_if_index0,
 374                 .ip.ip6 = ip0->src_address,
 375               };
 376               memcpy (&learn.mac, o0->ethernet_address, sizeof (learn.mac));
 377               ip_neighbor_learn_dp (&learn);
 378             }
 379
 380           /* default is to drop */
 381           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
 382
 383           if (error0 == ICMP6_ERROR_NONE)
 384             {
 385               vnet_sw_interface_t *sw_if0;
 386               ethernet_interface_t *eth_if0;
 387               u32 adj_index0;
 388
 389               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
 390               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
 391               eth_if0 =
 392                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
 393
 394               /* only support ethernet interface type for now */
 395               error0 =
 396                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
 397                 : error0;
 398
 399               if (error0 == ICMP6_ERROR_NONE)
 400                 {
 401                   /* adjust the sizeof the buffer to just include the ipv6 header */
 402                   p0->current_length -=
 403                     (options_len0 +
 404                      sizeof (icmp6_neighbor_discovery_header_t));
 405
 406                   radv_info = ip6_ra_get_itf (sw_if_index0);
 407
 408                   error0 = ((!radv_info) ?
 409                             ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
 410                             error0);
 411
 412                   if (error0 == ICMP6_ERROR_NONE)
 413                     {
 414                       f64 now = vlib_time_now (vm);
 415
 416                       /* for solicited adverts - need to rate limit */
 417                       if (is_solicitation)
 418                         {
 419                           if (0 != radv_info->last_radv_time &&
 420                               (now - radv_info->last_radv_time) <
 421                               MIN_DELAY_BETWEEN_RAS)
 422                             is_dropped = 1;
 423                           else
 424                             radv_info->last_radv_time = now;
 425                         }
 426
 427                       /* send now  */
 428                       icmp6_router_advertisement_header_t rh;
 429
 430                       rh.icmp.type = ICMP6_router_advertisement;
 431                       rh.icmp.code = 0;
 432                       rh.icmp.checksum = 0;
 433
 434                       rh.current_hop_limit = radv_info->curr_hop_limit;
 435                       rh.router_lifetime_in_sec =
 436                         clib_host_to_net_u16
 437                         (radv_info->adv_router_lifetime_in_sec);
 438                       rh.
 439                         time_in_msec_between_retransmitted_neighbor_solicitations
 440                         =
 441                         clib_host_to_net_u32 (radv_info->
 442                                               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
 443                       rh.neighbor_reachable_time_in_msec =
 444                         clib_host_to_net_u32 (radv_info->
 445                                               adv_neighbor_reachable_time_in_msec);
 446
 447                       rh.flags =
 448                         (radv_info->adv_managed_flag) ?
 449                         ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
 450                         0;
 451                       rh.flags |=
 452                         ((radv_info->adv_other_flag) ?
 453                          ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
 454                          0);
 455
 456
 457                       u16 payload_length =
 458                         sizeof (icmp6_router_advertisement_header_t);
 459
 460                       if (vlib_buffer_add_data
 461                           (vm, &bi0, (void *) &rh,
 462                            sizeof (icmp6_router_advertisement_header_t)))
 463                         {
 464                           /* buffer allocation failed, drop the pkt */
 465                           error0 = ICMP6_ERROR_ALLOC_FAILURE;
 466                           goto drop0;
 467                         }
 468
 469                       if (radv_info->adv_link_layer_address)
 470                         {
 471                           icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
 472                             h;
 473
 474                           h.header.type =
 475                             ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
 476                           h.header.n_data_u64s = 1;
 477
 478                           /* copy ll address */
 479                           clib_memcpy (&h.ethernet_address[0],
 480                                        eth_if0->address, 6);
 481
 482                           if (vlib_buffer_add_data
 483                               (vm, &bi0, (void *) &h,
 484                                sizeof
 485                                (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
 486                             {
 487                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
 488                               goto drop0;
 489                             }
 490
 491                           payload_length +=
 492                             sizeof
 493                             (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
 494                         }
 495
 496                       /* add MTU option */
 497                       if (radv_info->adv_link_mtu)
 498                         {
 499                           icmp6_neighbor_discovery_mtu_option_t h;
 500
 501                           h.unused = 0;
 502                           h.mtu =
 503                             clib_host_to_net_u32 (radv_info->adv_link_mtu);
 504                           h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
 505                           h.header.n_data_u64s = 1;
 506
 507                           payload_length +=
 508                             sizeof (icmp6_neighbor_discovery_mtu_option_t);
 509
 510                           if (vlib_buffer_add_data
 511                               (vm, &bi0, (void *) &h,
 512                                sizeof
 513                                (icmp6_neighbor_discovery_mtu_option_t)))
 514                             {
 515                               error0 = ICMP6_ERROR_ALLOC_FAILURE;
 516                               goto drop0;
 517                             }
 518                         }
 519
 520                       /* add advertised prefix options  */
 521                       ip6_radv_prefix_t *pr_info;
 522
 523                       /* *INDENT-OFF* */
 524                       pool_foreach (pr_info, radv_info->adv_prefixes_pool,
 525                       ({
 526                         if(pr_info->enabled &&
 527                            (!pr_info->decrement_lifetime_flag
 528                             || (pr_info->pref_lifetime_expires >0)))
 529                           {
 530                             /* advertise this prefix */
 531                             icmp6_neighbor_discovery_prefix_information_option_t h;
 532
 533                             h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
 534                             h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
 535
 536                             h.dst_address_length  = pr_info->prefix_len;
 537
 538                             h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
 539                             h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
 540
 541                             if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
 542                               {
 543                                 h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
 544                                 h.preferred_time  = 0;
 545                               }
 546                             else
 547                               {
 548                                 if(pr_info->decrement_lifetime_flag)
 549                                   {
 550                                     pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
 551                                       (pr_info->valid_lifetime_expires  - now) : 0;
 552
 553                                     pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
 554                                       (pr_info->pref_lifetime_expires  - now) : 0;
 555                                   }
 556
 557                                 h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
 558                                 h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
 559                               }
 560                             h.unused  = 0;
 561
 562                             clib_warning ("Prefix %U valid %u preferred %u",
 563                                           format_ip6_address, &pr_info->prefix,
 564                                           clib_net_to_host_u32 (h.valid_time),
 565                                           clib_net_to_host_u32 (h.preferred_time));
 566
 567                             if (h.valid_time == 0)
 568                               clib_warning ("WARNING: valid_time 0!!!");
 569
 570                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
 571
 572                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
 573
 574                             if (vlib_buffer_add_data
 575                                 (vm, &bi0, (void *)&h,
 576                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
 577                               {
 578                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
 579                                 goto drop0;
 580                               }
 581
 582                           }
 583                       }));
 584                       /* *INDENT-ON* */
 585
 586                       /* add additional options before here */
 587
 588                       /* finish building the router advertisement... */
 589                       if (!is_unspecified && radv_info->send_unicast)
 590                         {
 591                           ip0->dst_address = ip0->src_address;
 592                         }
 593                       else
 594                         {
 595                           /* target address is all-nodes mcast addr */
 596                           ip6_set_reserved_multicast_address
 597                             (&ip0->dst_address,
 598                              IP6_MULTICAST_SCOPE_link_local,
 599                              IP6_MULTICAST_GROUP_ID_all_hosts);
 600                         }
 601
 602                       /* source address MUST be the link-local address */
 603                       ip6_address_copy (&ip0->src_address,
 604                                         ip6_get_link_local_address
 605                                         (radv_info->sw_if_index));
 606
 607                       ip0->hop_limit = 255;
 608                       ip0->payload_length =
 609                         clib_host_to_net_u16 (payload_length);
 610
 611                       icmp6_router_advertisement_header_t *rh0 =
 612                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
 613                       rh0->icmp.checksum =
 614                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
 615                                                            &bogus_length);
 616                       ASSERT (bogus_length == 0);
 617
 618                       /* setup output if and adjacency */
 619                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
 620                         vnet_main.local_interface_sw_if_index;
 621
 622                       if (is_solicitation)
 623                         {
 624                           ethernet_header_t *eth0;
 625                           /* Reuse current MAC header, copy SMAC to DMAC and
 626                            * interface MAC to SMAC */
 627                           vlib_buffer_reset (p0);
 628                           eth0 = vlib_buffer_get_current (p0);
 629                           clib_memcpy (eth0->dst_address, eth0->src_address,
 630                                        6);
 631                           clib_memcpy (eth0->src_address, eth_if0->address,
 632                                        6);
 633                           next0 =
 634                             is_dropped ? next0 :
 635                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
 636                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
 637                             sw_if_index0;
 638                         }
 639                       else
 640                         {
 641                           adj_index0 = ip6_link_get_mcast_adj (sw_if_index0);
 642                           if (adj_index0 == INDEX_INVALID)
 643                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
 644                           else
 645                             {
 646                               next0 =
 647                                 is_dropped ? next0 :
 648                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
 649                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
 650                                 adj_index0;
 651                             }
 652                         }
 653                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 654
 655                       radv_info->n_solicitations_dropped += is_dropped;
 656                       radv_info->n_solicitations_rcvd += is_solicitation;
 657
 658                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
 659                         {
 660                           radv_info->n_advertisements_sent++;
 661                           n_advertisements_sent++;
 662                         }
 663                     }
 664                 }
 665             }
 666
 667         drop0:
 668           p0->error = error_node->errors[error0];
 669
 670           if (error0 != ICMP6_ERROR_NONE)
 671             vlib_error_count (vm, error_node->node_index, error0, 1);
 672
 673           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 674                                            to_next, n_left_to_next,
 675                                            bi0, next0);
 676
 677         }
 678
 679       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 680     }
 681
 682   /* Account for router advertisements sent. */
 683   vlib_error_count (vm, error_node->node_index,
 684                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
 685                     n_advertisements_sent);
 686
 687   return frame->n_vectors;
 688 }
 689
 690 /* *INDENT-OFF* */
 691 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
 692 {
 693   .function = icmp6_router_solicitation,
 694   .name = "icmp6-router-solicitation",
 695
 696   .vector_size = sizeof (u32),
 697
 698   .format_trace = format_icmp6_input_trace,
 699
 700   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
 701   .next_nodes = {
 702     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
 703     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
 704     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
 705   },
 706 };
 707 /* *INDENT-ON* */
 708
 709  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
 710 static_always_inline uword
 711 icmp6_router_advertisement (vlib_main_t * vm,
 712                             vlib_node_runtime_t * node, vlib_frame_t * frame)
 713 {
 714   vnet_main_t *vnm = vnet_get_main ();
 715   uword n_packets = frame->n_vectors;
 716   u32 *from, *to_next;
 717   u32 n_left_from, n_left_to_next, next_index;
 718   u32 n_advertisements_rcvd = 0;
 719
 720   vlib_node_runtime_t *error_node =
 721     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
 722
 723   from = vlib_frame_vector_args (frame);
 724   n_left_from = n_packets;
 725   next_index = node->cached_next_index;
 726
 727   if (node->flags & VLIB_NODE_FLAG_TRACE)
 728     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
 729                                    /* stride */ 1,
 730                                    sizeof (icmp6_input_trace_t));
 731
 732   while (n_left_from > 0)
 733     {
 734       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 735
 736       while (n_left_from > 0 && n_left_to_next > 0)
 737         {
 738           vlib_buffer_t *p0;
 739           ip6_header_t *ip0;
 740           ip6_ra_t *radv_info = 0;
 741           icmp6_router_advertisement_header_t *h0;
 742           u32 bi0, options_len0, sw_if_index0, next0, error0;
 743
 744           bi0 = to_next[0] = from[0];
 745
 746           from += 1;
 747           to_next += 1;
 748           n_left_from -= 1;
 749           n_left_to_next -= 1;
 750
 751           p0 = vlib_get_buffer (vm, bi0);
 752           ip0 = vlib_buffer_get_current (p0);
 753           h0 = ip6_next_header (ip0);
 754           options_len0 =
 755             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
 756
 757           error0 = ICMP6_ERROR_NONE;
 758           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
 759
 760           /* Check that source address is link-local */
 761           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
 762             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
 763
 764           /* default is to drop */
 765           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
 766
 767           n_advertisements_rcvd++;
 768
 769           if (error0 == ICMP6_ERROR_NONE)
 770             {
 771               vnet_sw_interface_t *sw_if0;
 772               ethernet_interface_t *eth_if0;
 773
 774               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
 775               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
 776               eth_if0 =
 777                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
 778
 779               /* only support ethernet interface type for now */
 780               error0 =
 781                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
 782                 : error0;
 783
 784               if (error0 == ICMP6_ERROR_NONE)
 785                 {
 786                   /* look up the radv_t information for this interface */
 787                   radv_info = ip6_ra_get_itf (sw_if_index0);
 788
 789                   error0 = ((!radv_info) ?
 790                             ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
 791                             error0);
 792
 793                   if (error0 == ICMP6_ERROR_NONE)
 794                     {
 795                       radv_info->keep_sending_rs = 0;
 796
 797                       ip6_ra_report_t r;
 798
 799                       r.sw_if_index = sw_if_index0;
 800                       memcpy (&r.router_address, &ip0->src_address, 16);
 801                       r.current_hop_limit = h0->current_hop_limit;
 802                       r.flags = h0->flags;
 803                       r.router_lifetime_in_sec =
 804                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
 805                       r.neighbor_reachable_time_in_msec =
 806                         clib_net_to_host_u32
 807                         (h0->neighbor_reachable_time_in_msec);
 808                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
 809                       r.prefixes = 0;
 810
 811                       /* validate advertised information */
 812                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
 813                           && (h0->current_hop_limit !=
 814                               radv_info->curr_hop_limit))
 815                         {
 816                           ip6_neighbor_syslog (vm, LOG_WARNING,
 817                                                "our AdvCurHopLimit on %U doesn't agree with %U",
 818                                                format_vnet_sw_if_index_name,
 819                                                vnm, sw_if_index0,
 820                                                format_ip6_address,
 821                                                &ip0->src_address);
 822                         }
 823
 824                       if ((h0->flags &
 825                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
 826                           != radv_info->adv_managed_flag)
 827                         {
 828                           ip6_neighbor_syslog (vm, LOG_WARNING,
 829                                                "our AdvManagedFlag on %U doesn't agree with %U",
 830                                                format_vnet_sw_if_index_name,
 831                                                vnm, sw_if_index0,
 832                                                format_ip6_address,
 833                                                &ip0->src_address);
 834                         }
 835
 836                       if ((h0->flags &
 837                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
 838                           != radv_info->adv_other_flag)
 839                         {
 840                           ip6_neighbor_syslog (vm, LOG_WARNING,
 841                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
 842                                                format_vnet_sw_if_index_name,
 843                                                vnm, sw_if_index0,
 844                                                format_ip6_address,
 845                                                &ip0->src_address);
 846                         }
 847
 848                       if ((h0->
 849                            time_in_msec_between_retransmitted_neighbor_solicitations
 850                            && radv_info->
 851                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
 852                           && (h0->
 853                               time_in_msec_between_retransmitted_neighbor_solicitations
 854                               !=
 855                               clib_host_to_net_u32 (radv_info->
 856                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
 857                         {
 858                           ip6_neighbor_syslog (vm, LOG_WARNING,
 859                                                "our AdvRetransTimer on %U doesn't agree with %U",
 860                                                format_vnet_sw_if_index_name,
 861                                                vnm, sw_if_index0,
 862                                                format_ip6_address,
 863                                                &ip0->src_address);
 864                         }
 865
 866                       if ((h0->neighbor_reachable_time_in_msec &&
 867                            radv_info->adv_neighbor_reachable_time_in_msec) &&
 868                           (h0->neighbor_reachable_time_in_msec !=
 869                            clib_host_to_net_u32
 870                            (radv_info->adv_neighbor_reachable_time_in_msec)))
 871                         {
 872                           ip6_neighbor_syslog (vm, LOG_WARNING,
 873                                                "our AdvReachableTime on %U doesn't agree with %U",
 874                                                format_vnet_sw_if_index_name,
 875                                                vnm, sw_if_index0,
 876                                                format_ip6_address,
 877                                                &ip0->src_address);
 878                         }
 879
 880                       /* check for MTU or prefix options or .. */
 881                       u8 *opt_hdr = (u8 *) (h0 + 1);
 882                       while (options_len0 > 0)
 883                         {
 884                           icmp6_neighbor_discovery_option_header_t *o0 =
 885                             (icmp6_neighbor_discovery_option_header_t *)
 886                             opt_hdr;
 887                           int opt_len = o0->n_data_u64s << 3;
 888                           icmp6_neighbor_discovery_option_type_t option_type =
 889                             o0->type;
 890
 891                           if (options_len0 < 2)
 892                             {
 893                               ip6_neighbor_syslog (vm, LOG_ERR,
 894                                                    "malformed RA packet on %U from %U",
 895                                                    format_vnet_sw_if_index_name,
 896                                                    vnm, sw_if_index0,
 897                                                    format_ip6_address,
 898                                                    &ip0->src_address);
 899                               break;
 900                             }
 901
 902                           if (opt_len == 0)
 903                             {
 904                               ip6_neighbor_syslog (vm, LOG_ERR,
 905                                                    " zero length option in RA on %U from %U",
 906                                                    format_vnet_sw_if_index_name,
 907                                                    vnm, sw_if_index0,
 908                                                    format_ip6_address,
 909                                                    &ip0->src_address);
 910                               break;
 911                             }
 912                           else if (opt_len > options_len0)
 913                             {
 914                               ip6_neighbor_syslog (vm, LOG_ERR,
 915                                                    "option length in RA packet  greater than total length on %U from %U",
 916                                                    format_vnet_sw_if_index_name,
 917                                                    vnm, sw_if_index0,
 918                                                    format_ip6_address,
 919                                                    &ip0->src_address);
 920                               break;
 921                             }
 922
 923                           options_len0 -= opt_len;
 924                           opt_hdr += opt_len;
 925
 926                           switch (option_type)
 927                             {
 928                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
 929                               {
 930                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
 931                                   * h =
 932                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
 933                                    *) (o0);
 934
 935                                 if (opt_len < sizeof (*h))
 936                                   break;
 937
 938                                 memcpy (r.slla, h->ethernet_address, 6);
 939                               }
 940                               break;
 941
 942                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
 943                               {
 944                                 icmp6_neighbor_discovery_mtu_option_t *h =
 945                                   (icmp6_neighbor_discovery_mtu_option_t
 946                                    *) (o0);
 947
 948                                 if (opt_len < sizeof (*h))
 949                                   break;
 950
 951                                 r.mtu = clib_net_to_host_u32 (h->mtu);
 952
 953                                 if ((h->mtu && radv_info->adv_link_mtu) &&
 954                                     (h->mtu !=
 955                                      clib_host_to_net_u32
 956                                      (radv_info->adv_link_mtu)))
 957                                   {
 958                                     ip6_neighbor_syslog (vm, LOG_WARNING,
 959                                                          "our AdvLinkMTU on %U doesn't agree with %U",
 960                                                          format_vnet_sw_if_index_name,
 961                                                          vnm, sw_if_index0,
 962                                                          format_ip6_address,
 963                                                          &ip0->src_address);
 964                                   }
 965                               }
 966                               break;
 967
 968                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
 969                               {
 970                                 icmp6_neighbor_discovery_prefix_information_option_t
 971                                   * h =
 972                                   (icmp6_neighbor_discovery_prefix_information_option_t
 973                                    *) (o0);
 974
 975                                 /* validate advertised prefix options  */
 976                                 ip6_radv_prefix_t *pr_info;
 977                                 u32 preferred, valid;
 978
 979                                 if (opt_len < sizeof (*h))
 980                                   break;
 981
 982                                 vec_validate (r.prefixes,
 983                                               vec_len (r.prefixes));
 984                                 ra_report_prefix_info_t *prefix =
 985                                   vec_elt_at_index (r.prefixes,
 986                                                     vec_len (r.prefixes) - 1);
 987
 988                                 preferred =
 989                                   clib_net_to_host_u32 (h->preferred_time);
 990                                 valid = clib_net_to_host_u32 (h->valid_time);
 991
 992                                 prefix->preferred_time = preferred;
 993                                 prefix->valid_time = valid;
 994                                 prefix->flags = h->flags & 0xc0;
 995                                 prefix->prefix.fp_len = h->dst_address_length;
 996                                 prefix->prefix.fp_addr.ip6 = h->dst_address;
 997                                 prefix->prefix.fp_proto = FIB_PROTOCOL_IP6;
 998
 999                                 /* look for matching prefix - if we our advertising it, it better be consistant */
1000                                 /* *INDENT-OFF* */
1001                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1002                                 ({
1003
1004                                   ip6_address_t mask;
1005                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
1006
1007                                   if(pr_info->enabled &&
1008                                      (pr_info->prefix_len == h->dst_address_length) &&
1009                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
1010                                     {
1011                                       /* found it */
1012                                       if(!pr_info->decrement_lifetime_flag &&
1013                                          valid != pr_info->adv_valid_lifetime_in_secs)
1014                                         {
1015                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1016                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
1017                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1018                                                               format_ip6_address, &h->dst_address);
1019                                         }
1020                                       if(!pr_info->decrement_lifetime_flag &&
1021                                          preferred != pr_info->adv_pref_lifetime_in_secs)
1022                                         {
1023                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1024                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
1025                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1026                                                               format_ip6_address, &h->dst_address);
1027                                         }
1028                                     }
1029                                   break;
1030                                 }));
1031                                 /* *INDENT-ON* */
1032                                 break;
1033                               }
1034                             default:
1035                               /* skip this one */
1036                               break;
1037                             }
1038                         }
1039                       ip6_ra_publish (&r);
1040                     }
1041                 }
1042             }
1043
1044           p0->error = error_node->errors[error0];
1045
1046           if (error0 != ICMP6_ERROR_NONE)
1047             vlib_error_count (vm, error_node->node_index, error0, 1);
1048
1049           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1050                                            to_next, n_left_to_next,
1051                                            bi0, next0);
1052         }
1053
1054       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1055     }
1056
1057   /* Account for router advertisements received. */
1058   vlib_error_count (vm, error_node->node_index,
1059                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
1060                     n_advertisements_rcvd);
1061
1062   return frame->n_vectors;
1063 }
1064
1065 /* *INDENT-OFF* */
1066 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
1067 {
1068   .function = icmp6_router_advertisement,
1069   .name = "icmp6-router-advertisement",
1070
1071   .vector_size = sizeof (u32),
1072
1073   .format_trace = format_icmp6_input_trace,
1074
1075   .n_next_nodes = 1,
1076   .next_nodes = {
1077     [0] = "ip6-drop",
1078   },
1079 };
1080 /* *INDENT-ON* */
1081
1082 static inline f64
1083 random_f64_from_to (f64 from, f64 to)
1084 {
1085   static u32 seed = 0;
1086   static u8 seed_set = 0;
1087   if (!seed_set)
1088     {
1089       seed = random_default_seed ();
1090       seed_set = 1;
1091     }
1092   return random_f64 (&seed) * (to - from) + from;
1093 }
1094
1095 static inline u8
1096 get_mac_address (u32 sw_if_index, u8 * address)
1097 {
1098   vnet_main_t *vnm = vnet_get_main ();
1099   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
1100   if (!hw_if->hw_address)
1101     return 1;
1102   clib_memcpy (address, hw_if->hw_address, 6);
1103   return 0;
1104 }
1105
1106 static inline vlib_buffer_t *
1107 create_buffer_for_rs (vlib_main_t * vm, ip6_ra_t * radv_info)
1108 {
1109   u32 bi0;
1110   vlib_buffer_t *p0;
1111   icmp6_router_solicitation_header_t *rh;
1112   u16 payload_length;
1113   int bogus_length;
1114   u32 sw_if_index;
1115
1116   sw_if_index = radv_info->sw_if_index;
1117
1118   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
1119     {
1120       clib_warning ("buffer allocation failure");
1121       return 0;
1122     }
1123
1124   p0 = vlib_get_buffer (vm, bi0);
1125   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
1126   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1127
1128   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
1129   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
1130
1131   vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1132     ip6_link_get_mcast_adj (sw_if_index);
1133
1134   rh = vlib_buffer_get_current (p0);
1135   p0->current_length = sizeof (*rh);
1136
1137   rh->neighbor.icmp.type = ICMP6_router_solicitation;
1138   rh->neighbor.icmp.code = 0;
1139   rh->neighbor.icmp.checksum = 0;
1140   rh->neighbor.reserved_must_be_zero = 0;
1141
1142   rh->link_layer_option.header.type =
1143     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1144   if (0 != get_mac_address (sw_if_index,
1145                             rh->link_layer_option.ethernet_address))
1146     {
1147       clib_warning ("interface with sw_if_index %u has no mac address",
1148                     sw_if_index);
1149       vlib_buffer_free (vm, &bi0, 1);
1150       return 0;
1151     }
1152   rh->link_layer_option.header.n_data_u64s = 1;
1153
1154   payload_length = sizeof (rh->neighbor) + sizeof (u64);
1155
1156   rh->ip.ip_version_traffic_class_and_flow_label =
1157     clib_host_to_net_u32 (0x6 << 28);
1158   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
1159   rh->ip.protocol = IP_PROTOCOL_ICMP6;
1160   rh->ip.hop_limit = 255;
1161   ip6_address_copy (&rh->ip.src_address,
1162                     ip6_get_link_local_address (radv_info->sw_if_index));
1163   /* set address ff02::2 */
1164   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
1165   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
1166
1167   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
1168                                                                   &rh->ip,
1169                                                                   &bogus_length);
1170
1171   return p0;
1172 }
1173
1174 static inline void
1175 stop_sending_rs (vlib_main_t * vm, ip6_ra_t * ra)
1176 {
1177   u32 bi0;
1178
1179   ra->keep_sending_rs = 0;
1180   if (ra->buffer)
1181     {
1182       bi0 = vlib_get_buffer_index (vm, ra->buffer);
1183       vlib_buffer_free (vm, &bi0, 1);
1184       ra->buffer = 0;
1185     }
1186 }
1187
1188 static inline bool
1189 check_send_rs (vlib_main_t * vm, ip6_ra_t * radv_info, f64 current_time,
1190                f64 * due_time)
1191 {
1192   vlib_buffer_t *p0;
1193   vlib_frame_t *f;
1194   u32 *to_next;
1195   u32 next_index;
1196   vlib_buffer_t *c0;
1197   u32 ci0;
1198
1199   icmp6_send_router_solicitation_params_t *params;
1200
1201   if (!radv_info->keep_sending_rs)
1202     return false;
1203
1204   params = &radv_info->params;
1205
1206   if (radv_info->due_time > current_time)
1207     {
1208       *due_time = radv_info->due_time;
1209       return true;
1210     }
1211
1212   p0 = radv_info->buffer;
1213
1214   next_index = ip6_rewrite_mcast_node.index;
1215
1216   c0 = vlib_buffer_copy (vm, p0);
1217   ci0 = vlib_get_buffer_index (vm, c0);
1218
1219   f = vlib_get_frame_to_node (vm, next_index);
1220   to_next = vlib_frame_vector_args (f);
1221   to_next[0] = ci0;
1222   f->n_vectors = 1;
1223   vlib_put_frame_to_node (vm, next_index, f);
1224
1225   if (params->mrc != 0 && --radv_info->n_left == 0)
1226     stop_sending_rs (vm, radv_info);
1227   else
1228     {
1229       radv_info->sleep_interval =
1230         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
1231       if (radv_info->sleep_interval > params->mrt)
1232         radv_info->sleep_interval =
1233           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
1234
1235       radv_info->due_time = current_time + radv_info->sleep_interval;
1236
1237       if (params->mrd != 0
1238           && current_time > radv_info->start_time + params->mrd)
1239         stop_sending_rs (vm, radv_info);
1240       else
1241         *due_time = radv_info->due_time;
1242     }
1243
1244   return radv_info->keep_sending_rs;
1245 }
1246
1247 static uword
1248 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1249                  vlib_frame_t * f0)
1250 {
1251   uword *event_data = NULL;
1252   f64 sleep_time = 1e9;
1253   ip6_ra_t *radv_info;
1254   f64 current_time;
1255   f64 due_time;
1256   f64 dt = 0;
1257
1258   while (true)
1259     {
1260       vlib_process_wait_for_event_or_clock (vm, sleep_time);
1261       vlib_process_get_events (vm, &event_data);
1262       vec_reset_length (event_data);
1263
1264       current_time = vlib_time_now (vm);
1265       do
1266         {
1267           due_time = current_time + 1e9;
1268         /* *INDENT-OFF* */
1269         pool_foreach (radv_info, ip6_ra_pool,
1270         ({
1271             if (check_send_rs (vm, radv_info, current_time, &dt)
1272                 && (dt < due_time))
1273               due_time = dt;
1274         }));
1275         /* *INDENT-ON* */
1276           current_time = vlib_time_now (vm);
1277         }
1278       while (due_time < current_time);
1279
1280       sleep_time = due_time - current_time;
1281     }
1282
1283   return 0;
1284 }
1285
1286 /* *INDENT-OFF* */
1287 VLIB_REGISTER_NODE (ip6_rs_process_node) = {
1288     .function = send_rs_process,
1289     .type = VLIB_NODE_TYPE_PROCESS,
1290     .name = "ip6-rs-process",
1291 };
1292 /* *INDENT-ON* */
1293
1294 void
1295 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
1296                                 const icmp6_send_router_solicitation_params_t
1297                                 * params)
1298 {
1299   ip6_ra_t *ra;
1300
1301   ASSERT (~0 != sw_if_index);
1302
1303   ra = ip6_ra_get_itf (sw_if_index);
1304
1305   if (!ra)
1306     return;
1307
1308   stop_sending_rs (vm, ra);
1309
1310   if (!stop)
1311     {
1312       ra->keep_sending_rs = 1;
1313       ra->params = *params;
1314       ra->n_left = params->mrc;
1315       ra->start_time = vlib_time_now (vm);
1316       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
1317       ra->due_time = 0;         /* send first packet ASAP */
1318       ra->buffer = create_buffer_for_rs (vm, ra);
1319       if (!ra->buffer)
1320         ra->keep_sending_rs = 0;
1321       else
1322         vlib_process_signal_event (vm, ip6_rs_process_node.index, 1, 0);
1323     }
1324 }
1325
1326 static const ethernet_interface_t *
1327 ip6_ra_get_eth_itf (u32 sw_if_index)
1328 {
1329   const vnet_sw_interface_t *sw;
1330
1331   /* lookup radv container  - ethernet interfaces only */
1332   sw = vnet_get_sup_sw_interface (vnet_get_main (), sw_if_index);
1333   if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
1334     return (ethernet_get_interface (&ethernet_main, sw->hw_if_index));
1335
1336   return (NULL);
1337 }
1338
1339 /**
1340  * @brief called when IP6 is enabled on an interface
1341  *create and initialize router advertisement parameters with default
1342  * values for this intfc
1343  */
1344 static void
1345 ip6_ra_link_enable (u32 sw_if_index)
1346 {
1347   const ethernet_interface_t *eth;
1348   ip6_ra_t *radv_info;
1349
1350   eth = ip6_ra_get_eth_itf (sw_if_index);
1351
1352   if (NULL == eth)
1353     return;
1354
1355   ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index,
1356                                                   ip6_ra_delegate_id));
1357
1358   pool_get_zero (ip6_ra_pool, radv_info);
1359
1360   radv_info->seed = (u32) clib_cpu_time_now ();
1361   random_u32 (&radv_info->seed);
1362
1363   radv_info->sw_if_index = sw_if_index;
1364   radv_info->max_radv_interval = DEF_MAX_RADV_INTERVAL;
1365   radv_info->min_radv_interval = DEF_MIN_RADV_INTERVAL;
1366   radv_info->curr_hop_limit = DEF_CURR_HOP_LIMIT;
1367   radv_info->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
1368
1369   /* send ll address source address option */
1370   radv_info->adv_link_layer_address = 1;
1371
1372   radv_info->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
1373   radv_info->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
1374   radv_info->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
1375
1376   radv_info->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
1377   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1378   radv_info->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1379
1380   /* deafult is to send */
1381   radv_info->send_radv = 1;
1382
1383   /* fill in delegate for this interface that will be needed later */
1384   radv_info->adv_link_mtu =
1385     vnet_sw_interface_get_mtu (vnet_get_main (), sw_if_index, VNET_MTU_IP6);
1386
1387   mhash_init (&radv_info->address_to_prefix_index, sizeof (uword),
1388               sizeof (ip6_address_t));
1389
1390   ip6_link_delegate_update (sw_if_index, ip6_ra_delegate_id,
1391                             radv_info - ip6_ra_pool);
1392 }
1393
1394 static void
1395 ip6_ra_delegate_disable (index_t rai)
1396 {
1397   ip6_radv_prefix_t *p;
1398   ip6_ra_t *radv_info;
1399
1400   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
1401
1402   /* clean up prefix and MDP pools */
1403   /* *INDENT-OFF* */
1404   pool_flush(p, radv_info->adv_prefixes_pool,
1405   ({
1406     mhash_unset (&radv_info->address_to_prefix_index, &p->prefix, 0);
1407   }));
1408   /* *INDENT-ON* */
1409
1410   pool_free (radv_info->adv_prefixes_pool);
1411
1412   mhash_free (&radv_info->address_to_prefix_index);
1413
1414   pool_put (ip6_ra_pool, radv_info);
1415 }
1416
1417 /* send a RA or update the timer info etc.. */
1418 static uword
1419 ip6_ra_process_timer_event (vlib_main_t * vm,
1420                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1421 {
1422   vnet_main_t *vnm = vnet_get_main ();
1423   ip6_ra_t *radv_info;
1424   vlib_frame_t *f = 0;
1425   u32 n_this_frame = 0;
1426   u32 n_left_to_next = 0;
1427   u32 *to_next = 0;
1428   u32 bo0;
1429   icmp6_router_solicitation_header_t *h0;
1430   vlib_buffer_t *b0;
1431   f64 now = vlib_time_now (vm);
1432
1433   /* Interface ip6 radv info list */
1434   /* *INDENT-OFF* */
1435   pool_foreach (radv_info, ip6_ra_pool,
1436   ({
1437     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
1438       {
1439         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
1440         radv_info->next_multicast_time = now;
1441         radv_info->last_multicast_time = now;
1442         radv_info->last_radv_time = 0;
1443         continue;
1444       }
1445
1446     /* is it time to send a multicast  RA on this interface? */
1447     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
1448       {
1449         u32 n_to_alloc = 1;
1450         u32 n_allocated;
1451
1452         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
1453           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
1454
1455         /* multicast send - compute next multicast send time */
1456         if( radv_info->initial_adverts_sent > 0)
1457           {
1458             radv_info->initial_adverts_sent--;
1459             if(rfn > radv_info->initial_adverts_interval)
1460               rfn =  radv_info->initial_adverts_interval;
1461
1462             /* check to see if we are ceasing to send */
1463             if( radv_info->initial_adverts_sent  == 0)
1464               if(radv_info->cease_radv)
1465                 radv_info->send_radv = 0;
1466           }
1467
1468         radv_info->next_multicast_time =  rfn + now;
1469         radv_info->last_multicast_time = now;
1470
1471         /* send advert now - build a "solicted" router advert with unspecified source address */
1472         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
1473
1474         if (PREDICT_FALSE(n_allocated == 0))
1475           {
1476             clib_warning ("buffer allocation failure");
1477             continue;
1478           }
1479         b0 = vlib_get_buffer (vm, bo0);
1480         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
1481         b0->error = ICMP6_ERROR_NONE;
1482         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
1483
1484         h0 =  vlib_buffer_get_current (b0);
1485
1486         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
1487
1488         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
1489         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
1490                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
1491         h0->ip.protocol = IP_PROTOCOL_ICMP6;
1492         h0->ip.hop_limit = 255;
1493
1494         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
1495         h0->ip.src_address.as_u64[0] = 0;
1496         h0->ip.src_address.as_u64[1] = 0;
1497
1498         h0->ip.dst_address.as_u64[0] = 0;
1499         h0->ip.dst_address.as_u64[1] = 0;
1500
1501         h0->neighbor.icmp.type = ICMP6_router_solicitation;
1502
1503         if (PREDICT_FALSE(f == 0))
1504           {
1505             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
1506             to_next = vlib_frame_vector_args (f);
1507             n_left_to_next = VLIB_FRAME_SIZE;
1508             n_this_frame = 0;
1509           }
1510
1511         n_this_frame++;
1512         n_left_to_next--;
1513         to_next[0] = bo0;
1514         to_next += 1;
1515
1516         if (PREDICT_FALSE(n_left_to_next == 0))
1517           {
1518             f->n_vectors = n_this_frame;
1519             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1520             f = 0;
1521           }
1522       }
1523   }));
1524   /* *INDENT-ON* */
1525
1526   if (f)
1527     {
1528       ASSERT (n_this_frame);
1529       f->n_vectors = n_this_frame;
1530       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1531     }
1532   return 0;
1533 }
1534
1535 static void
1536 ip6_ra_handle_report (const ip6_ra_report_t * rap)
1537 {
1538   u32 ii;
1539
1540   vec_foreach_index (ii, ip6_ra_listeners) ip6_ra_listeners[ii] (rap);
1541 }
1542
1543 static uword
1544 ip6_ra_event_process (vlib_main_t * vm,
1545                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1546 {
1547   ip6_ra_report_t *r, *rs;
1548   uword event_type;
1549
1550   /* init code here */
1551
1552   while (1)
1553     {
1554       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
1555
1556       rs = vlib_process_get_event_data (vm, &event_type);
1557
1558       if (NULL == rs)
1559         {
1560           /* No events found: timer expired. */
1561           /* process interface list and send RAs as appropriate, update timer info */
1562           ip6_ra_process_timer_event (vm, node, frame);
1563         }
1564       else
1565         {
1566           vec_foreach (r, rs) ip6_ra_handle_report (r);
1567           vec_reset_length (rs);
1568         }
1569     }
1570   return frame->n_vectors;
1571 }
1572
1573 VLIB_REGISTER_NODE (ip6_ra_process_node) =
1574 {
1575 .function = ip6_ra_event_process,.name = "ip6-ra-process",.type =
1576     VLIB_NODE_TYPE_PROCESS,};
1577
1578 static void
1579 ip6_ra_signal_report (ip6_ra_report_t * r)
1580 {
1581   vlib_main_t *vm = vlib_get_main ();
1582   ip6_ra_report_t *q;
1583
1584   if (!vec_len (ip6_ra_listeners))
1585     return;
1586
1587   q = vlib_process_signal_event_data (vm,
1588                                       ip6_ra_process_node.index,
1589                                       0, 1, sizeof *q);
1590   *q = *r;
1591 }
1592
1593 static int
1594 ip6_ra_publish (ip6_ra_report_t * r)
1595 {
1596   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
1597   vl_api_rpc_call_main_thread (ip6_ra_signal_report, (u8 *) r, sizeof *r);
1598   return 0;
1599 }
1600
1601 /* API support functions */
1602 int
1603 ip6_ra_config (vlib_main_t * vm, u32 sw_if_index,
1604                u8 suppress, u8 managed, u8 other,
1605                u8 ll_option, u8 send_unicast, u8 cease,
1606                u8 use_lifetime, u32 lifetime,
1607                u32 initial_count, u32 initial_interval,
1608                u32 max_interval, u32 min_interval, u8 is_no)
1609 {
1610   ip6_ra_t *radv_info;
1611
1612   /* look up the radv_t  information for this interface */
1613   radv_info = ip6_ra_get_itf (sw_if_index);
1614
1615   if (!radv_info)
1616     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1617
1618   if ((max_interval != 0) && (min_interval == 0))
1619     min_interval = .75 * max_interval;
1620
1621   max_interval =
1622     (max_interval !=
1623      0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
1624     radv_info->max_radv_interval;
1625   min_interval =
1626     (min_interval !=
1627      0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
1628     radv_info->min_radv_interval;
1629   lifetime =
1630     (use_lifetime !=
1631      0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
1632     radv_info->adv_router_lifetime_in_sec;
1633
1634   if (lifetime)
1635     {
1636       if (lifetime > MAX_DEF_RTR_LIFETIME)
1637         lifetime = MAX_DEF_RTR_LIFETIME;
1638
1639       if (lifetime <= max_interval)
1640         return VNET_API_ERROR_INVALID_VALUE;
1641     }
1642
1643   if (min_interval != 0)
1644     {
1645       if ((min_interval > .75 * max_interval) || (min_interval < 3))
1646         return VNET_API_ERROR_INVALID_VALUE;
1647     }
1648
1649   if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
1650       (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
1651     return VNET_API_ERROR_INVALID_VALUE;
1652
1653   /*
1654      if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
1655      if "flag" is clear  don't change corresponding value
1656    */
1657   radv_info->send_radv =
1658     (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
1659   radv_info->adv_managed_flag =
1660     (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
1661   radv_info->adv_other_flag =
1662     (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
1663   radv_info->adv_link_layer_address =
1664     (ll_option != 0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
1665   radv_info->send_unicast =
1666     (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
1667   radv_info->cease_radv =
1668     (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
1669
1670   radv_info->min_radv_interval = min_interval;
1671   radv_info->max_radv_interval = max_interval;
1672   radv_info->adv_router_lifetime_in_sec = lifetime;
1673
1674   radv_info->initial_adverts_count =
1675     (initial_count !=
1676      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
1677     radv_info->initial_adverts_count;
1678   radv_info->initial_adverts_interval =
1679     (initial_interval !=
1680      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
1681     radv_info->initial_adverts_interval;
1682
1683   /* restart */
1684   if ((cease != 0) && (is_no))
1685     radv_info->send_radv = 1;
1686
1687   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1688   radv_info->next_multicast_time = vlib_time_now (vm);
1689   radv_info->last_multicast_time = vlib_time_now (vm);
1690   radv_info->last_radv_time = 0;
1691
1692   return (0);
1693 }
1694
1695
1696 int
1697 ip6_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
1698                ip6_address_t * prefix_addr, u8 prefix_len,
1699                u8 use_default, u32 val_lifetime, u32 pref_lifetime,
1700                u8 no_advertise, u8 off_link, u8 no_autoconfig,
1701                u8 no_onlink, u8 is_no)
1702 {
1703   ip6_ra_t *radv_info;
1704
1705   /* look up the radv_t  information for this interface */
1706   radv_info = ip6_ra_get_itf (sw_if_index);
1707
1708   if (!radv_info)
1709     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1710
1711   f64 now = vlib_time_now (vm);
1712
1713   /* prefix info add, delete or update */
1714   ip6_radv_prefix_t *prefix;
1715
1716   /* lookup  prefix info for this  address on this interface */
1717   uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
1718
1719   prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
1720
1721   if (is_no)
1722     {
1723       /* delete */
1724       if (!prefix)
1725         return VNET_API_ERROR_INVALID_VALUE;    /* invalid prefix */
1726
1727       if (prefix->prefix_len != prefix_len)
1728         return VNET_API_ERROR_INVALID_VALUE_2;
1729
1730       /* FIXME - Should the DP do this or the CP ? */
1731       /* do specific delete processing here before returning */
1732       /* try to remove from routing table */
1733
1734       mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
1735                    /* old_value */ 0);
1736       pool_put (radv_info->adv_prefixes_pool, prefix);
1737
1738       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1739       radv_info->next_multicast_time = vlib_time_now (vm);
1740       radv_info->last_multicast_time = vlib_time_now (vm);
1741       radv_info->last_radv_time = 0;
1742       return (0);
1743     }
1744
1745   /* adding or changing */
1746   if (!prefix)
1747     {
1748       /* add */
1749       u32 pi;
1750       pool_get_zero (radv_info->adv_prefixes_pool, prefix);
1751       pi = prefix - radv_info->adv_prefixes_pool;
1752       mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
1753                  /* old_value */ 0);
1754
1755       clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
1756
1757       prefix->prefix_len = prefix_len;
1758       clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
1759
1760       /* initialize default values */
1761       prefix->adv_on_link_flag = 1;     /* L bit set */
1762       prefix->adv_autonomous_flag = 1;  /* A bit set */
1763       prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
1764       prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
1765       prefix->enabled = 1;
1766       prefix->decrement_lifetime_flag = 1;
1767       prefix->deprecated_prefix_flag = 1;
1768
1769       if (off_link == 0)
1770         {
1771           /* FIXME - Should the DP do this or the CP ? */
1772           /* insert prefix into routing table as a connected prefix */
1773         }
1774
1775       if (use_default)
1776         goto restart;
1777     }
1778   else
1779     {
1780
1781       if (prefix->prefix_len != prefix_len)
1782         return VNET_API_ERROR_INVALID_VALUE_2;
1783
1784       if (off_link != 0)
1785         {
1786           /* FIXME - Should the DP do this or the CP ? */
1787           /* remove from routing table if already there */
1788         }
1789     }
1790
1791   if ((val_lifetime == ~0) || (pref_lifetime == ~0))
1792     {
1793       prefix->adv_valid_lifetime_in_secs = ~0;
1794       prefix->adv_pref_lifetime_in_secs = ~0;
1795       prefix->decrement_lifetime_flag = 0;
1796     }
1797   else
1798     {
1799       prefix->adv_valid_lifetime_in_secs = val_lifetime;;
1800       prefix->adv_pref_lifetime_in_secs = pref_lifetime;
1801     }
1802
1803   /* copy  remaining */
1804   prefix->enabled = !(no_advertise != 0);
1805   prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
1806   prefix->adv_autonomous_flag = !(no_autoconfig != 0);
1807
1808 restart:
1809   /* restart */
1810   /* fill in the expiration times  */
1811   prefix->valid_lifetime_expires = now + prefix->adv_valid_lifetime_in_secs;
1812   prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
1813
1814   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1815   radv_info->next_multicast_time = vlib_time_now (vm);
1816   radv_info->last_multicast_time = vlib_time_now (vm);
1817   radv_info->last_radv_time = 0;
1818
1819   return (0);
1820 }
1821
1822 clib_error_t *
1823 ip6_ra_cmd (vlib_main_t * vm,
1824             unformat_input_t * main_input, vlib_cli_command_t * cmd)
1825 {
1826   vnet_main_t *vnm = vnet_get_main ();
1827   clib_error_t *error = 0;
1828   u8 is_no = 0;
1829   u8 suppress = 0, managed = 0, other = 0;
1830   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
1831   u8 use_lifetime = 0;
1832   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
1833     0, ra_initial_interval = 0;
1834   u32 ra_max_interval = 0, ra_min_interval = 0;
1835
1836   unformat_input_t _line_input, *line_input = &_line_input;
1837
1838   int add_radv_info = 1;
1839   ip6_address_t ip6_addr;
1840   u32 addr_len;
1841
1842
1843   /* Get a line of input. */
1844   if (!unformat_user (main_input, unformat_line_input, line_input))
1845     return 0;
1846
1847   /* get basic radv info for this interface */
1848   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1849     {
1850
1851       if (unformat_user (line_input,
1852                          unformat_vnet_sw_interface, vnm, &sw_if_index))
1853         {
1854           if (!ip6_ra_get_eth_itf (sw_if_index))
1855             {
1856               error =
1857                 clib_error_return (0, "Interface must be of ethernet type");
1858               goto done;
1859             }
1860
1861           if (!ip6_link_is_enabled (sw_if_index))
1862             {
1863               error = clib_error_return (0, "IP6 nt enabler interface %U'",
1864                                          format_unformat_error, line_input);
1865               goto done;
1866             }
1867         }
1868       else
1869         {
1870           error = clib_error_return (0, "invalid interface name %U'",
1871                                      format_unformat_error, line_input);
1872           goto done;
1873         }
1874     }
1875
1876   /* get the rest of the command */
1877   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1878     {
1879       if (unformat (line_input, "no"))
1880         is_no = 1;
1881       else if (unformat (line_input, "prefix %U/%d",
1882                          unformat_ip6_address, &ip6_addr, &addr_len))
1883         {
1884           add_radv_info = 0;
1885           break;
1886         }
1887       else if (unformat (line_input, "ra-managed-config-flag"))
1888         {
1889           managed = 1;
1890           break;
1891         }
1892       else if (unformat (line_input, "ra-other-config-flag"))
1893         {
1894           other = 1;
1895           break;
1896         }
1897       else if (unformat (line_input, "ra-suppress") ||
1898                unformat (line_input, "ra-surpress"))
1899         {
1900           suppress = 1;
1901           break;
1902         }
1903       else if (unformat (line_input, "ra-suppress-link-layer") ||
1904                unformat (line_input, "ra-surpress-link-layer"))
1905         {
1906           suppress_ll_option = 1;
1907           break;
1908         }
1909       else if (unformat (line_input, "ra-send-unicast"))
1910         {
1911           send_unicast = 1;
1912           break;
1913         }
1914       else if (unformat (line_input, "ra-lifetime"))
1915         {
1916           if (!unformat (line_input, "%d", &ra_lifetime))
1917             {
1918               error = unformat_parse_error (line_input);
1919               goto done;
1920             }
1921           use_lifetime = 1;
1922           break;
1923         }
1924       else if (unformat (line_input, "ra-initial"))
1925         {
1926           if (!unformat
1927               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
1928             {
1929               error = unformat_parse_error (line_input);
1930               goto done;
1931             }
1932           break;
1933         }
1934       else if (unformat (line_input, "ra-interval"))
1935         {
1936           if (!unformat (line_input, "%d", &ra_max_interval))
1937             {
1938               error = unformat_parse_error (line_input);
1939               goto done;
1940             }
1941
1942           if (!unformat (line_input, "%d", &ra_min_interval))
1943             ra_min_interval = 0;
1944           break;
1945         }
1946       else if (unformat (line_input, "ra-cease"))
1947         {
1948           cease = 1;
1949           break;
1950         }
1951       else
1952         {
1953           error = unformat_parse_error (line_input);
1954           goto done;
1955         }
1956     }
1957
1958   if (add_radv_info)
1959     {
1960       ip6_ra_config (vm, sw_if_index,
1961                      suppress, managed, other,
1962                      suppress_ll_option, send_unicast, cease,
1963                      use_lifetime, ra_lifetime,
1964                      ra_initial_count, ra_initial_interval,
1965                      ra_max_interval, ra_min_interval, is_no);
1966     }
1967   else
1968     {
1969       u32 valid_lifetime_in_secs = 0;
1970       u32 pref_lifetime_in_secs = 0;
1971       u8 use_prefix_default_values = 0;
1972       u8 no_advertise = 0;
1973       u8 off_link = 0;
1974       u8 no_autoconfig = 0;
1975       u8 no_onlink = 0;
1976
1977       /* get the rest of the command */
1978       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1979         {
1980           if (unformat (line_input, "default"))
1981             {
1982               use_prefix_default_values = 1;
1983               break;
1984             }
1985           else if (unformat (line_input, "infinite"))
1986             {
1987               valid_lifetime_in_secs = ~0;
1988               pref_lifetime_in_secs = ~0;
1989               break;
1990             }
1991           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
1992                              &pref_lifetime_in_secs))
1993             break;
1994           else
1995             break;
1996         }
1997
1998
1999       /* get the rest of the command */
2000       while (!use_prefix_default_values &&
2001              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2002         {
2003           if (unformat (line_input, "no-advertise"))
2004             no_advertise = 1;
2005           else if (unformat (line_input, "off-link"))
2006             off_link = 1;
2007           else if (unformat (line_input, "no-autoconfig"))
2008             no_autoconfig = 1;
2009           else if (unformat (line_input, "no-onlink"))
2010             no_onlink = 1;
2011           else
2012             {
2013               error = unformat_parse_error (line_input);
2014               goto done;
2015             }
2016         }
2017
2018       ip6_ra_prefix (vm, sw_if_index,
2019                      &ip6_addr, addr_len,
2020                      use_prefix_default_values,
2021                      valid_lifetime_in_secs,
2022                      pref_lifetime_in_secs,
2023                      no_advertise, off_link, no_autoconfig, no_onlink, is_no);
2024     }
2025
2026 done:
2027   unformat_free (line_input);
2028
2029   return error;
2030 }
2031
2032 static u8 *
2033 format_ip6_ra (u8 * s, va_list * args)
2034 {
2035   index_t rai = va_arg (*args, index_t);
2036   u32 indent = va_arg (*args, u32);
2037   ip6_radv_prefix_t *p;
2038   ip6_ra_t *radv_info;
2039
2040   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
2041
2042   s = format (s, "%UAdvertised Prefixes:\n", format_white_space, indent);
2043
2044   indent += 2;
2045
2046   /* *INDENT-OFF* */
2047   pool_foreach (p, radv_info->adv_prefixes_pool,
2048   ({
2049     s = format (s, "%Uprefix %U, length %d\n",
2050                 format_white_space, indent+2,
2051                 format_ip6_address, &p->prefix, p->prefix_len);
2052   }));
2053   /* *INDENT-ON* */
2054
2055   s = format (s, "%UMTU is %d\n",
2056               format_white_space, indent, radv_info->adv_link_mtu);
2057   s = format (s, "%UICMP error messages are unlimited\n",
2058               format_white_space, indent);
2059   s = format (s, "%UICMP redirects are disabled\n",
2060               format_white_space, indent);
2061   s = format (s, "%UICMP unreachables are not sent\n",
2062               format_white_space, indent);
2063   s = format (s, "%UND DAD is disabled\n", format_white_space, indent);
2064   //s = format (s, "%UND reachable time is %d milliseconds\n",);
2065   s = format (s, "%UND advertised reachable time is %d\n",
2066               format_white_space, indent,
2067               radv_info->adv_neighbor_reachable_time_in_msec);
2068   s = format (s,
2069               "%UND advertised retransmit interval is %d (msec)\n",
2070               format_white_space, indent,
2071               radv_info->
2072               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
2073   s =
2074     format (s,
2075             "%UND router advertisements are sent every %0.1f seconds (min interval is %0.1f)\n",
2076             format_white_space, indent, radv_info->max_radv_interval,
2077             radv_info->min_radv_interval);
2078   s =
2079     format (s, "%UND router advertisements live for %d seconds\n",
2080             format_white_space, indent,
2081             radv_info->adv_router_lifetime_in_sec);
2082   s =
2083     format (s, "%UHosts %s stateless autoconfig for addresses\n",
2084             format_white_space, indent,
2085             (radv_info->adv_managed_flag) ? "use" : " don't use");
2086   s =
2087     format (s, "%UND router advertisements sent %d\n", format_white_space,
2088             indent, radv_info->n_advertisements_sent);
2089   s =
2090     format (s, "%UND router solicitations received %d\n", format_white_space,
2091             indent, radv_info->n_solicitations_rcvd);
2092   s =
2093     format (s, "%UND router solicitations dropped %d\n", format_white_space,
2094             indent, radv_info->n_solicitations_dropped);
2095
2096   return (s);
2097 }
2098
2099
2100 /*?
2101  * This command is used to configure the neighbor discovery
2102  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
2103  * command to display some of the current neighbor discovery parameters
2104  * on a given interface. This command has three formats:
2105  *
2106  *
2107  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
2108  *
2109  * '<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>'
2110  *
2111  * Where:
2112  *
2113  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
2114  * router-advertisement messages to use stateful address
2115  * auto-configuration to obtain address information (sets the M-bit).
2116  * Default is the M-bit is not set and the '<em>no</em>' option
2117  * returns it to this default state.
2118  *
2119  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
2120  * router-advertisement messages that hosts use stateful auto
2121  * configuration to obtain nonaddress related information (sets
2122  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
2123  * option returns it to this default state.
2124  *
2125  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
2126  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
2127  * router-advertisement messages.
2128  *
2129  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
2130  * optional source link-layer address in the ICMPv6 router-advertisement
2131  * messages. Default is to include the optional source link-layer address
2132  * and the '<em>no</em>' option returns it to this default state.
2133  *
2134  * <em>[no] ra-send-unicast</em> - Use the source address of the
2135  * router-solicitation message if availiable. The default is to use
2136  * multicast address of all nodes, and the '<em>no</em>' option returns
2137  * it to this default state.
2138  *
2139  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
2140  * default router in ICMPv6 router-advertisement messages. The range is
2141  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
2142  * '<em><max-interval></em>'. The default value is 600 seconds and the
2143  * '<em>no</em>' option returns it to this default value.
2144  *
2145  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
2146  * router-advertisement messages sent and the interval between each
2147  * message. Range for count is 1 - 3 and default is 3. Range for interval
2148  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
2149  * returns both to their default value.
2150  *
2151  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
2152  * interval between sending ICMPv6 router-advertisement messages. The
2153  * range for max-interval is from 4 to 200 seconds. min-interval can not
2154  * be more than 75% of max-interval. If not set, min-interval will be
2155  * set to 75% of max-interval. The range for min-interval is from 3 to
2156  * 150 seconds.  The '<em>no</em>' option returns both to their default
2157  * value.
2158  *
2159  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
2160  * The '<em>no</em>' options implies to start (or restart) sending
2161  * ICMPv6 router-advertisement messages.
2162  *
2163  *
2164  * <b>Format 2 - Prefix Options:</b>
2165  *
2166  * '<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>'
2167  *
2168  * Where:
2169  *
2170  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
2171  *
2172  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
2173  * length of time in seconds during what the prefix is valid for the purpose of
2174  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
2175  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
2176  * length of time in seconds during what addresses generated from the prefix remain
2177  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
2178  *
2179  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
2180  * are inifinte, no timeout.
2181  *
2182  * <em>no-advertise</em> - Do not send full router address in prefix
2183  * advertisement. Default is to advertise (i.e. - This flag is off by default).
2184  *
2185  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
2186  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
2187  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
2188  *
2189  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
2190  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
2191  *
2192  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
2193  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
2194  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
2195  * the L-bit.
2196  *
2197  *
2198  * <b>Format 3: - Default of Prefix:</b>
2199  *
2200  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
2201  *
2202  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
2203  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
2204  * is ignored and the prefix is deleted.
2205  *
2206  *
2207  * @cliexpar
2208  * Example of how set a router advertisement option:
2209  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
2210  * Example of how to add a prefix:
2211  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
2212  * Example of how to delete a prefix:
2213  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
2214 ?*/
2215 /* *INDENT-OFF* */
2216 VLIB_CLI_COMMAND (ip6_nd_command, static) =
2217 {
2218   .path = "ip6 nd",
2219   .short_help = "ip6 nd <interface> ...",
2220   .function = ip6_ra_cmd,
2221 };
2222 /* *INDENT-ON* */
2223
2224 /**
2225  * VFT for registering as a delegate to an IP6 link
2226  */
2227 const static ip6_link_delegate_vft_t ip6_ra_delegate_vft = {
2228   .ildv_disable = ip6_ra_delegate_disable,
2229   .ildv_enable = ip6_ra_link_enable,
2230   .ildv_format = format_ip6_ra,
2231 };
2232
2233 static clib_error_t *
2234 ip6_ra_init (vlib_main_t * vm)
2235 {
2236   vlib_call_init_function (vm, icmp6_init);
2237
2238   icmp6_register_type (vm, ICMP6_router_solicitation,
2239                        ip6_icmp_router_solicitation_node.index);
2240   icmp6_register_type (vm, ICMP6_router_advertisement,
2241                        ip6_icmp_router_advertisement_node.index);
2242
2243   ip6_ra_delegate_id = ip6_link_delegate_register (&ip6_ra_delegate_vft);
2244
2245   return (NULL);
2246 }
2247
2248 /* *INDENT-OFF* */
2249 VLIB_INIT_FUNCTION (ip6_ra_init) =
2250 {
2251   .runs_after = VLIB_INITS("icmp6_init"),
2252 };
2253 /* *INDENT-ON* */
2254
2255 /*
2256  * fd.io coding-style-patch-verification: ON
2257  *
2258  * Local Variables:
2259  * eval: (c-set-style "gnu")
2260  * End:
2261  */