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                             /* Handy for debugging, but too noisy... */
 563                             if (0 && CLIB_DEBUG > 0)
 564                               clib_warning
 565                                 ("send RA for prefix %U/%d "
 566                                  "sw_if_index %d valid %u preferred %u",
 567                                  format_ip6_address, &pr_info->prefix,
 568                                  pr_info->prefix_len, sw_if_index0,
 569                                  clib_net_to_host_u32 (h.valid_time),
 570                                  clib_net_to_host_u32 (h.preferred_time));
 571
 572                             if (h.valid_time == 0)
 573                               clib_warning ("BUG: send RA with valid_time 0");
 574
 575                             clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
 576
 577                             payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
 578
 579                             if (vlib_buffer_add_data
 580                                 (vm, &bi0, (void *)&h,
 581                                  sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
 582                               {
 583                                 error0 = ICMP6_ERROR_ALLOC_FAILURE;
 584                                 goto drop0;
 585                               }
 586
 587                           }
 588                       }));
 589                       /* *INDENT-ON* */
 590
 591                       /* add additional options before here */
 592
 593                       /* finish building the router advertisement... */
 594                       if (!is_unspecified && radv_info->send_unicast)
 595                         {
 596                           ip0->dst_address = ip0->src_address;
 597                         }
 598                       else
 599                         {
 600                           /* target address is all-nodes mcast addr */
 601                           ip6_set_reserved_multicast_address
 602                             (&ip0->dst_address,
 603                              IP6_MULTICAST_SCOPE_link_local,
 604                              IP6_MULTICAST_GROUP_ID_all_hosts);
 605                         }
 606
 607                       /* source address MUST be the link-local address */
 608                       ip6_address_copy (&ip0->src_address,
 609                                         ip6_get_link_local_address
 610                                         (radv_info->sw_if_index));
 611
 612                       ip0->hop_limit = 255;
 613                       ip0->payload_length =
 614                         clib_host_to_net_u16 (payload_length);
 615
 616                       icmp6_router_advertisement_header_t *rh0 =
 617                         (icmp6_router_advertisement_header_t *) (ip0 + 1);
 618                       rh0->icmp.checksum =
 619                         ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
 620                                                            &bogus_length);
 621                       ASSERT (bogus_length == 0);
 622
 623                       /* setup output if and adjacency */
 624                       vnet_buffer (p0)->sw_if_index[VLIB_RX] =
 625                         vnet_main.local_interface_sw_if_index;
 626
 627                       if (is_solicitation)
 628                         {
 629                           ethernet_header_t *eth0;
 630                           /* Reuse current MAC header, copy SMAC to DMAC and
 631                            * interface MAC to SMAC */
 632                           vlib_buffer_reset (p0);
 633                           eth0 = vlib_buffer_get_current (p0);
 634                           clib_memcpy (eth0->dst_address, eth0->src_address,
 635                                        6);
 636                           clib_memcpy (eth0->src_address, eth_if0->address,
 637                                        6);
 638                           next0 =
 639                             is_dropped ? next0 :
 640                             ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
 641                           vnet_buffer (p0)->sw_if_index[VLIB_TX] =
 642                             sw_if_index0;
 643                         }
 644                       else
 645                         {
 646                           adj_index0 = ip6_link_get_mcast_adj (sw_if_index0);
 647                           if (adj_index0 == INDEX_INVALID)
 648                             error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
 649                           else
 650                             {
 651                               next0 =
 652                                 is_dropped ? next0 :
 653                                 ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
 654                               vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
 655                                 adj_index0;
 656                             }
 657                         }
 658                       p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 659
 660                       radv_info->n_solicitations_dropped += is_dropped;
 661                       radv_info->n_solicitations_rcvd += is_solicitation;
 662
 663                       if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
 664                         {
 665                           radv_info->n_advertisements_sent++;
 666                           n_advertisements_sent++;
 667                         }
 668                     }
 669                 }
 670             }
 671
 672         drop0:
 673           p0->error = error_node->errors[error0];
 674
 675           if (error0 != ICMP6_ERROR_NONE)
 676             vlib_error_count (vm, error_node->node_index, error0, 1);
 677
 678           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 679                                            to_next, n_left_to_next,
 680                                            bi0, next0);
 681
 682         }
 683
 684       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 685     }
 686
 687   /* Account for router advertisements sent. */
 688   vlib_error_count (vm, error_node->node_index,
 689                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
 690                     n_advertisements_sent);
 691
 692   return frame->n_vectors;
 693 }
 694
 695 /* *INDENT-OFF* */
 696 VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
 697 {
 698   .function = icmp6_router_solicitation,
 699   .name = "icmp6-router-solicitation",
 700
 701   .vector_size = sizeof (u32),
 702
 703   .format_trace = format_icmp6_input_trace,
 704
 705   .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
 706   .next_nodes = {
 707     [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
 708     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
 709     [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
 710   },
 711 };
 712 /* *INDENT-ON* */
 713
 714  /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
 715 static_always_inline uword
 716 icmp6_router_advertisement (vlib_main_t * vm,
 717                             vlib_node_runtime_t * node, vlib_frame_t * frame)
 718 {
 719   vnet_main_t *vnm = vnet_get_main ();
 720   uword n_packets = frame->n_vectors;
 721   u32 *from, *to_next;
 722   u32 n_left_from, n_left_to_next, next_index;
 723   u32 n_advertisements_rcvd = 0;
 724
 725   vlib_node_runtime_t *error_node =
 726     vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
 727
 728   from = vlib_frame_vector_args (frame);
 729   n_left_from = n_packets;
 730   next_index = node->cached_next_index;
 731
 732   if (node->flags & VLIB_NODE_FLAG_TRACE)
 733     vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
 734                                    /* stride */ 1,
 735                                    sizeof (icmp6_input_trace_t));
 736
 737   while (n_left_from > 0)
 738     {
 739       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 740
 741       while (n_left_from > 0 && n_left_to_next > 0)
 742         {
 743           vlib_buffer_t *p0;
 744           ip6_header_t *ip0;
 745           ip6_ra_t *radv_info = 0;
 746           icmp6_router_advertisement_header_t *h0;
 747           u32 bi0, options_len0, sw_if_index0, next0, error0;
 748
 749           bi0 = to_next[0] = from[0];
 750
 751           from += 1;
 752           to_next += 1;
 753           n_left_from -= 1;
 754           n_left_to_next -= 1;
 755
 756           p0 = vlib_get_buffer (vm, bi0);
 757           ip0 = vlib_buffer_get_current (p0);
 758           h0 = ip6_next_header (ip0);
 759           options_len0 =
 760             clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
 761
 762           error0 = ICMP6_ERROR_NONE;
 763           sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
 764
 765           /* Check that source address is link-local */
 766           error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
 767             ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
 768
 769           /* default is to drop */
 770           next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
 771
 772           n_advertisements_rcvd++;
 773
 774           if (error0 == ICMP6_ERROR_NONE)
 775             {
 776               vnet_sw_interface_t *sw_if0;
 777               ethernet_interface_t *eth_if0;
 778
 779               sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
 780               ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
 781               eth_if0 =
 782                 ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
 783
 784               /* only support ethernet interface type for now */
 785               error0 =
 786                 (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
 787                 : error0;
 788
 789               if (error0 == ICMP6_ERROR_NONE)
 790                 {
 791                   /* look up the radv_t information for this interface */
 792                   radv_info = ip6_ra_get_itf (sw_if_index0);
 793
 794                   error0 = ((!radv_info) ?
 795                             ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
 796                             error0);
 797
 798                   if (error0 == ICMP6_ERROR_NONE)
 799                     {
 800                       radv_info->keep_sending_rs = 0;
 801
 802                       ip6_ra_report_t r;
 803
 804                       r.sw_if_index = sw_if_index0;
 805                       memcpy (&r.router_address, &ip0->src_address, 16);
 806                       r.current_hop_limit = h0->current_hop_limit;
 807                       r.flags = h0->flags;
 808                       r.router_lifetime_in_sec =
 809                         clib_net_to_host_u16 (h0->router_lifetime_in_sec);
 810                       r.neighbor_reachable_time_in_msec =
 811                         clib_net_to_host_u32
 812                         (h0->neighbor_reachable_time_in_msec);
 813                       r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
 814                       r.prefixes = 0;
 815
 816                       /* validate advertised information */
 817                       if ((h0->current_hop_limit && radv_info->curr_hop_limit)
 818                           && (h0->current_hop_limit !=
 819                               radv_info->curr_hop_limit))
 820                         {
 821                           ip6_neighbor_syslog (vm, LOG_WARNING,
 822                                                "our AdvCurHopLimit on %U doesn't agree with %U",
 823                                                format_vnet_sw_if_index_name,
 824                                                vnm, sw_if_index0,
 825                                                format_ip6_address,
 826                                                &ip0->src_address);
 827                         }
 828
 829                       if ((h0->flags &
 830                            ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
 831                           != radv_info->adv_managed_flag)
 832                         {
 833                           ip6_neighbor_syslog (vm, LOG_WARNING,
 834                                                "our AdvManagedFlag on %U doesn't agree with %U",
 835                                                format_vnet_sw_if_index_name,
 836                                                vnm, sw_if_index0,
 837                                                format_ip6_address,
 838                                                &ip0->src_address);
 839                         }
 840
 841                       if ((h0->flags &
 842                            ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
 843                           != radv_info->adv_other_flag)
 844                         {
 845                           ip6_neighbor_syslog (vm, LOG_WARNING,
 846                                                "our AdvOtherConfigFlag on %U doesn't agree with %U",
 847                                                format_vnet_sw_if_index_name,
 848                                                vnm, sw_if_index0,
 849                                                format_ip6_address,
 850                                                &ip0->src_address);
 851                         }
 852
 853                       if ((h0->
 854                            time_in_msec_between_retransmitted_neighbor_solicitations
 855                            && radv_info->
 856                            adv_time_in_msec_between_retransmitted_neighbor_solicitations)
 857                           && (h0->
 858                               time_in_msec_between_retransmitted_neighbor_solicitations
 859                               !=
 860                               clib_host_to_net_u32 (radv_info->
 861                                                     adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
 862                         {
 863                           ip6_neighbor_syslog (vm, LOG_WARNING,
 864                                                "our AdvRetransTimer on %U doesn't agree with %U",
 865                                                format_vnet_sw_if_index_name,
 866                                                vnm, sw_if_index0,
 867                                                format_ip6_address,
 868                                                &ip0->src_address);
 869                         }
 870
 871                       if ((h0->neighbor_reachable_time_in_msec &&
 872                            radv_info->adv_neighbor_reachable_time_in_msec) &&
 873                           (h0->neighbor_reachable_time_in_msec !=
 874                            clib_host_to_net_u32
 875                            (radv_info->adv_neighbor_reachable_time_in_msec)))
 876                         {
 877                           ip6_neighbor_syslog (vm, LOG_WARNING,
 878                                                "our AdvReachableTime on %U doesn't agree with %U",
 879                                                format_vnet_sw_if_index_name,
 880                                                vnm, sw_if_index0,
 881                                                format_ip6_address,
 882                                                &ip0->src_address);
 883                         }
 884
 885                       /* check for MTU or prefix options or .. */
 886                       u8 *opt_hdr = (u8 *) (h0 + 1);
 887                       while (options_len0 > 0)
 888                         {
 889                           icmp6_neighbor_discovery_option_header_t *o0 =
 890                             (icmp6_neighbor_discovery_option_header_t *)
 891                             opt_hdr;
 892                           int opt_len = o0->n_data_u64s << 3;
 893                           icmp6_neighbor_discovery_option_type_t option_type =
 894                             o0->type;
 895
 896                           if (options_len0 < 2)
 897                             {
 898                               ip6_neighbor_syslog (vm, LOG_ERR,
 899                                                    "malformed RA packet on %U from %U",
 900                                                    format_vnet_sw_if_index_name,
 901                                                    vnm, sw_if_index0,
 902                                                    format_ip6_address,
 903                                                    &ip0->src_address);
 904                               break;
 905                             }
 906
 907                           if (opt_len == 0)
 908                             {
 909                               ip6_neighbor_syslog (vm, LOG_ERR,
 910                                                    " zero length option in RA on %U from %U",
 911                                                    format_vnet_sw_if_index_name,
 912                                                    vnm, sw_if_index0,
 913                                                    format_ip6_address,
 914                                                    &ip0->src_address);
 915                               break;
 916                             }
 917                           else if (opt_len > options_len0)
 918                             {
 919                               ip6_neighbor_syslog (vm, LOG_ERR,
 920                                                    "option length in RA packet  greater than total length on %U from %U",
 921                                                    format_vnet_sw_if_index_name,
 922                                                    vnm, sw_if_index0,
 923                                                    format_ip6_address,
 924                                                    &ip0->src_address);
 925                               break;
 926                             }
 927
 928                           options_len0 -= opt_len;
 929                           opt_hdr += opt_len;
 930
 931                           switch (option_type)
 932                             {
 933                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
 934                               {
 935                                 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
 936                                   * h =
 937                                   (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
 938                                    *) (o0);
 939
 940                                 if (opt_len < sizeof (*h))
 941                                   break;
 942
 943                                 memcpy (r.slla, h->ethernet_address, 6);
 944                               }
 945                               break;
 946
 947                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
 948                               {
 949                                 icmp6_neighbor_discovery_mtu_option_t *h =
 950                                   (icmp6_neighbor_discovery_mtu_option_t
 951                                    *) (o0);
 952
 953                                 if (opt_len < sizeof (*h))
 954                                   break;
 955
 956                                 r.mtu = clib_net_to_host_u32 (h->mtu);
 957
 958                                 if ((h->mtu && radv_info->adv_link_mtu) &&
 959                                     (h->mtu !=
 960                                      clib_host_to_net_u32
 961                                      (radv_info->adv_link_mtu)))
 962                                   {
 963                                     ip6_neighbor_syslog (vm, LOG_WARNING,
 964                                                          "our AdvLinkMTU on %U doesn't agree with %U",
 965                                                          format_vnet_sw_if_index_name,
 966                                                          vnm, sw_if_index0,
 967                                                          format_ip6_address,
 968                                                          &ip0->src_address);
 969                                   }
 970                               }
 971                               break;
 972
 973                             case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
 974                               {
 975                                 icmp6_neighbor_discovery_prefix_information_option_t
 976                                   * h =
 977                                   (icmp6_neighbor_discovery_prefix_information_option_t
 978                                    *) (o0);
 979
 980                                 /* validate advertised prefix options  */
 981                                 ip6_radv_prefix_t *pr_info;
 982                                 u32 preferred, valid;
 983
 984                                 if (opt_len < sizeof (*h))
 985                                   break;
 986
 987                                 vec_validate (r.prefixes,
 988                                               vec_len (r.prefixes));
 989                                 ra_report_prefix_info_t *prefix =
 990                                   vec_elt_at_index (r.prefixes,
 991                                                     vec_len (r.prefixes) - 1);
 992
 993                                 preferred =
 994                                   clib_net_to_host_u32 (h->preferred_time);
 995                                 valid = clib_net_to_host_u32 (h->valid_time);
 996
 997                                 prefix->preferred_time = preferred;
 998                                 prefix->valid_time = valid;
 999                                 prefix->flags = h->flags & 0xc0;
1000                                 prefix->prefix.fp_len = h->dst_address_length;
1001                                 prefix->prefix.fp_addr.ip6 = h->dst_address;
1002                                 prefix->prefix.fp_proto = FIB_PROTOCOL_IP6;
1003
1004                                 /* look for matching prefix - if we our advertising it, it better be consistant */
1005                                 /* *INDENT-OFF* */
1006                                 pool_foreach (pr_info, radv_info->adv_prefixes_pool,
1007                                 ({
1008
1009                                   ip6_address_t mask;
1010                                   ip6_address_mask_from_width(&mask, pr_info->prefix_len);
1011
1012                                   if(pr_info->enabled &&
1013                                      (pr_info->prefix_len == h->dst_address_length) &&
1014                                      ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
1015                                     {
1016                                       /* found it */
1017                                       if(!pr_info->decrement_lifetime_flag &&
1018                                          valid != pr_info->adv_valid_lifetime_in_secs)
1019                                         {
1020                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1021                                                               "our ADV validlifetime on  %U for %U does not  agree with %U",
1022                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1023                                                               format_ip6_address, &h->dst_address);
1024                                         }
1025                                       if(!pr_info->decrement_lifetime_flag &&
1026                                          preferred != pr_info->adv_pref_lifetime_in_secs)
1027                                         {
1028                                           ip6_neighbor_syslog(vm,  LOG_WARNING,
1029                                                               "our ADV preferredlifetime on  %U for %U does not  agree with %U",
1030                                                               format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
1031                                                               format_ip6_address, &h->dst_address);
1032                                         }
1033                                     }
1034                                   break;
1035                                 }));
1036                                 /* *INDENT-ON* */
1037                                 break;
1038                               }
1039                             default:
1040                               /* skip this one */
1041                               break;
1042                             }
1043                         }
1044                       ip6_ra_publish (&r);
1045                     }
1046                 }
1047             }
1048
1049           p0->error = error_node->errors[error0];
1050
1051           if (error0 != ICMP6_ERROR_NONE)
1052             vlib_error_count (vm, error_node->node_index, error0, 1);
1053
1054           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1055                                            to_next, n_left_to_next,
1056                                            bi0, next0);
1057         }
1058
1059       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1060     }
1061
1062   /* Account for router advertisements received. */
1063   vlib_error_count (vm, error_node->node_index,
1064                     ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
1065                     n_advertisements_rcvd);
1066
1067   return frame->n_vectors;
1068 }
1069
1070 /* *INDENT-OFF* */
1071 VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
1072 {
1073   .function = icmp6_router_advertisement,
1074   .name = "icmp6-router-advertisement",
1075
1076   .vector_size = sizeof (u32),
1077
1078   .format_trace = format_icmp6_input_trace,
1079
1080   .n_next_nodes = 1,
1081   .next_nodes = {
1082     [0] = "ip6-drop",
1083   },
1084 };
1085 /* *INDENT-ON* */
1086
1087 static inline f64
1088 random_f64_from_to (f64 from, f64 to)
1089 {
1090   static u32 seed = 0;
1091   static u8 seed_set = 0;
1092   if (!seed_set)
1093     {
1094       seed = random_default_seed ();
1095       seed_set = 1;
1096     }
1097   return random_f64 (&seed) * (to - from) + from;
1098 }
1099
1100 static inline u8
1101 get_mac_address (u32 sw_if_index, u8 * address)
1102 {
1103   vnet_main_t *vnm = vnet_get_main ();
1104   vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
1105   if (!hw_if->hw_address)
1106     return 1;
1107   clib_memcpy (address, hw_if->hw_address, 6);
1108   return 0;
1109 }
1110
1111 static inline vlib_buffer_t *
1112 create_buffer_for_rs (vlib_main_t * vm, ip6_ra_t * radv_info)
1113 {
1114   u32 bi0;
1115   vlib_buffer_t *p0;
1116   icmp6_router_solicitation_header_t *rh;
1117   u16 payload_length;
1118   int bogus_length;
1119   u32 sw_if_index;
1120
1121   sw_if_index = radv_info->sw_if_index;
1122
1123   if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
1124     {
1125       clib_warning ("buffer allocation failure");
1126       return 0;
1127     }
1128
1129   p0 = vlib_get_buffer (vm, bi0);
1130   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
1131   p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1132
1133   vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
1134   vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
1135
1136   vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1137     ip6_link_get_mcast_adj (sw_if_index);
1138
1139   rh = vlib_buffer_get_current (p0);
1140   p0->current_length = sizeof (*rh);
1141
1142   rh->neighbor.icmp.type = ICMP6_router_solicitation;
1143   rh->neighbor.icmp.code = 0;
1144   rh->neighbor.icmp.checksum = 0;
1145   rh->neighbor.reserved_must_be_zero = 0;
1146
1147   rh->link_layer_option.header.type =
1148     ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
1149   if (0 != get_mac_address (sw_if_index,
1150                             rh->link_layer_option.ethernet_address))
1151     {
1152       clib_warning ("interface with sw_if_index %u has no mac address",
1153                     sw_if_index);
1154       vlib_buffer_free (vm, &bi0, 1);
1155       return 0;
1156     }
1157   rh->link_layer_option.header.n_data_u64s = 1;
1158
1159   payload_length = sizeof (rh->neighbor) + sizeof (u64);
1160
1161   rh->ip.ip_version_traffic_class_and_flow_label =
1162     clib_host_to_net_u32 (0x6 << 28);
1163   rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
1164   rh->ip.protocol = IP_PROTOCOL_ICMP6;
1165   rh->ip.hop_limit = 255;
1166   ip6_address_copy (&rh->ip.src_address,
1167                     ip6_get_link_local_address (radv_info->sw_if_index));
1168   /* set address ff02::2 */
1169   rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
1170   rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
1171
1172   rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
1173                                                                   &rh->ip,
1174                                                                   &bogus_length);
1175
1176   return p0;
1177 }
1178
1179 static inline void
1180 stop_sending_rs (vlib_main_t * vm, ip6_ra_t * ra)
1181 {
1182   u32 bi0;
1183
1184   ra->keep_sending_rs = 0;
1185   if (ra->buffer)
1186     {
1187       bi0 = vlib_get_buffer_index (vm, ra->buffer);
1188       vlib_buffer_free (vm, &bi0, 1);
1189       ra->buffer = 0;
1190     }
1191 }
1192
1193 static inline bool
1194 check_send_rs (vlib_main_t * vm, ip6_ra_t * radv_info, f64 current_time,
1195                f64 * due_time)
1196 {
1197   vlib_buffer_t *p0;
1198   vlib_frame_t *f;
1199   u32 *to_next;
1200   u32 next_index;
1201   vlib_buffer_t *c0;
1202   u32 ci0;
1203
1204   icmp6_send_router_solicitation_params_t *params;
1205
1206   if (!radv_info->keep_sending_rs)
1207     return false;
1208
1209   params = &radv_info->params;
1210
1211   if (radv_info->due_time > current_time)
1212     {
1213       *due_time = radv_info->due_time;
1214       return true;
1215     }
1216
1217   p0 = radv_info->buffer;
1218
1219   next_index = ip6_rewrite_mcast_node.index;
1220
1221   c0 = vlib_buffer_copy (vm, p0);
1222   if (c0 == NULL)
1223     return radv_info->keep_sending_rs;
1224
1225   ci0 = vlib_get_buffer_index (vm, c0);
1226
1227   f = vlib_get_frame_to_node (vm, next_index);
1228   to_next = vlib_frame_vector_args (f);
1229   to_next[0] = ci0;
1230   f->n_vectors = 1;
1231   vlib_put_frame_to_node (vm, next_index, f);
1232
1233   if (params->mrc != 0 && --radv_info->n_left == 0)
1234     stop_sending_rs (vm, radv_info);
1235   else
1236     {
1237       radv_info->sleep_interval =
1238         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
1239       if (radv_info->sleep_interval > params->mrt)
1240         radv_info->sleep_interval =
1241           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
1242
1243       radv_info->due_time = current_time + radv_info->sleep_interval;
1244
1245       if (params->mrd != 0
1246           && current_time > radv_info->start_time + params->mrd)
1247         stop_sending_rs (vm, radv_info);
1248       else
1249         *due_time = radv_info->due_time;
1250     }
1251
1252   return radv_info->keep_sending_rs;
1253 }
1254
1255 static uword
1256 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1257                  vlib_frame_t * f0)
1258 {
1259   uword *event_data = NULL;
1260   f64 sleep_time = 1e9;
1261   ip6_ra_t *radv_info;
1262   f64 current_time;
1263   f64 due_time;
1264   f64 dt = 0;
1265
1266   while (true)
1267     {
1268       vlib_process_wait_for_event_or_clock (vm, sleep_time);
1269       vlib_process_get_events (vm, &event_data);
1270       vec_reset_length (event_data);
1271
1272       current_time = vlib_time_now (vm);
1273       do
1274         {
1275           due_time = current_time + 1e9;
1276         /* *INDENT-OFF* */
1277         pool_foreach (radv_info, ip6_ra_pool,
1278         ({
1279             if (check_send_rs (vm, radv_info, current_time, &dt)
1280                 && (dt < due_time))
1281               due_time = dt;
1282         }));
1283         /* *INDENT-ON* */
1284           current_time = vlib_time_now (vm);
1285         }
1286       while (due_time < current_time);
1287
1288       sleep_time = due_time - current_time;
1289     }
1290
1291   return 0;
1292 }
1293
1294 /* *INDENT-OFF* */
1295 VLIB_REGISTER_NODE (ip6_rs_process_node) = {
1296     .function = send_rs_process,
1297     .type = VLIB_NODE_TYPE_PROCESS,
1298     .name = "ip6-rs-process",
1299 };
1300 /* *INDENT-ON* */
1301
1302 void
1303 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
1304                                 const icmp6_send_router_solicitation_params_t
1305                                 * params)
1306 {
1307   ip6_ra_t *ra;
1308
1309   ASSERT (~0 != sw_if_index);
1310
1311   ra = ip6_ra_get_itf (sw_if_index);
1312
1313   if (!ra)
1314     return;
1315
1316   stop_sending_rs (vm, ra);
1317
1318   if (!stop)
1319     {
1320       ra->keep_sending_rs = 1;
1321       ra->params = *params;
1322       ra->n_left = params->mrc;
1323       ra->start_time = vlib_time_now (vm);
1324       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
1325       ra->due_time = 0;         /* send first packet ASAP */
1326       ra->buffer = create_buffer_for_rs (vm, ra);
1327       if (!ra->buffer)
1328         ra->keep_sending_rs = 0;
1329       else
1330         vlib_process_signal_event (vm, ip6_rs_process_node.index, 1, 0);
1331     }
1332 }
1333
1334 static const ethernet_interface_t *
1335 ip6_ra_get_eth_itf (u32 sw_if_index)
1336 {
1337   const vnet_sw_interface_t *sw;
1338
1339   /* lookup radv container  - ethernet interfaces only */
1340   sw = vnet_get_sup_sw_interface (vnet_get_main (), sw_if_index);
1341   if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
1342     return (ethernet_get_interface (&ethernet_main, sw->hw_if_index));
1343
1344   return (NULL);
1345 }
1346
1347 /**
1348  * @brief called when IP6 is enabled on an interface
1349  *create and initialize router advertisement parameters with default
1350  * values for this intfc
1351  */
1352 static void
1353 ip6_ra_link_enable (u32 sw_if_index)
1354 {
1355   const ethernet_interface_t *eth;
1356   ip6_ra_t *radv_info;
1357
1358   eth = ip6_ra_get_eth_itf (sw_if_index);
1359
1360   if (NULL == eth)
1361     return;
1362
1363   ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index,
1364                                                   ip6_ra_delegate_id));
1365
1366   pool_get_zero (ip6_ra_pool, radv_info);
1367
1368   radv_info->seed = (u32) clib_cpu_time_now ();
1369   random_u32 (&radv_info->seed);
1370
1371   radv_info->sw_if_index = sw_if_index;
1372   radv_info->max_radv_interval = DEF_MAX_RADV_INTERVAL;
1373   radv_info->min_radv_interval = DEF_MIN_RADV_INTERVAL;
1374   radv_info->curr_hop_limit = DEF_CURR_HOP_LIMIT;
1375   radv_info->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
1376
1377   /* send ll address source address option */
1378   radv_info->adv_link_layer_address = 1;
1379
1380   radv_info->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
1381   radv_info->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
1382   radv_info->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
1383
1384   radv_info->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
1385   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1386   radv_info->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1387
1388   /* deafult is to send */
1389   radv_info->send_radv = 1;
1390
1391   /* fill in delegate for this interface that will be needed later */
1392   radv_info->adv_link_mtu =
1393     vnet_sw_interface_get_mtu (vnet_get_main (), sw_if_index, VNET_MTU_IP6);
1394
1395   mhash_init (&radv_info->address_to_prefix_index, sizeof (uword),
1396               sizeof (ip6_address_t));
1397
1398   ip6_link_delegate_update (sw_if_index, ip6_ra_delegate_id,
1399                             radv_info - ip6_ra_pool);
1400 }
1401
1402 static void
1403 ip6_ra_delegate_disable (index_t rai)
1404 {
1405   ip6_radv_prefix_t *p;
1406   ip6_ra_t *radv_info;
1407
1408   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
1409
1410   /* clean up prefix and MDP pools */
1411   /* *INDENT-OFF* */
1412   pool_flush(p, radv_info->adv_prefixes_pool,
1413   ({
1414     mhash_unset (&radv_info->address_to_prefix_index, &p->prefix, 0);
1415   }));
1416   /* *INDENT-ON* */
1417
1418   pool_free (radv_info->adv_prefixes_pool);
1419
1420   mhash_free (&radv_info->address_to_prefix_index);
1421
1422   pool_put (ip6_ra_pool, radv_info);
1423 }
1424
1425 void
1426 ip6_ra_update_secondary_radv_info (ip6_address_t * address, u8 prefix_len,
1427                                    u32 primary_sw_if_index,
1428                                    u32 valid_time, u32 preferred_time)
1429 {
1430   vlib_main_t *vm = vlib_get_main ();
1431   static u32 *radv_indices;
1432   ip6_ra_t *radv_info;
1433   int i;
1434   ip6_address_t mask;
1435   ip6_address_mask_from_width (&mask, prefix_len);
1436
1437   vec_reset_length (radv_indices);
1438   /* *INDENT-OFF* */
1439   pool_foreach (radv_info, ip6_ra_pool,
1440   ({
1441     vec_add1 (radv_indices, radv_info - ip6_ra_pool);
1442   }));
1443   /* *INDENT-ON* */
1444
1445   /*
1446    * If we have another customer for this prefix,
1447    * tell the RA code about it...
1448    */
1449   for (i = 0; i < vec_len (radv_indices); i++)
1450     {
1451       ip6_radv_prefix_t *this_prefix;
1452       radv_info = pool_elt_at_index (ip6_ra_pool, radv_indices[i]);
1453
1454       /* We already took care of these timers... */
1455       if (radv_info->sw_if_index == primary_sw_if_index)
1456         continue;
1457
1458       /* *INDENT-OFF* */
1459       pool_foreach (this_prefix, radv_info->adv_prefixes_pool,
1460       ({
1461         if (this_prefix->prefix_len == prefix_len
1462             && ip6_address_is_equal_masked (&this_prefix->prefix, address,
1463                                             &mask))
1464           {
1465             int rv = ip6_ra_prefix (vm,
1466                                     radv_info->sw_if_index,
1467                                     address,
1468                                     prefix_len,
1469                                     0 /* use_default */,
1470                                     valid_time,
1471                                     preferred_time,
1472                                     0 /* no_advertise */,
1473                                     0 /* off_link */,
1474                                     0 /* no_autoconfig */,
1475                                     0 /* no_onlink */,
1476                                     0 /* is_no */);
1477             if (rv != 0)
1478               clib_warning ("ip6_neighbor_ra_prefix returned %d", rv);
1479           }
1480       }));
1481       /* *INDENT-ON*/
1482     }
1483 }
1484
1485 /* send a RA or update the timer info etc.. */
1486 static uword
1487 ip6_ra_process_timer_event (vlib_main_t * vm,
1488                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1489 {
1490   vnet_main_t *vnm = vnet_get_main ();
1491   ip6_ra_t *radv_info;
1492   vlib_frame_t *f = 0;
1493   u32 n_this_frame = 0;
1494   u32 n_left_to_next = 0;
1495   u32 *to_next = 0;
1496   u32 bo0;
1497   icmp6_router_solicitation_header_t *h0;
1498   vlib_buffer_t *b0;
1499   f64 now = vlib_time_now (vm);
1500
1501   /* Interface ip6 radv info list */
1502   /* *INDENT-OFF* */
1503   pool_foreach (radv_info, ip6_ra_pool,
1504   ({
1505     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
1506       {
1507         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
1508         radv_info->next_multicast_time = now;
1509         radv_info->last_multicast_time = now;
1510         radv_info->last_radv_time = 0;
1511         continue;
1512       }
1513
1514     /* is it time to send a multicast  RA on this interface? */
1515     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
1516       {
1517         u32 n_to_alloc = 1;
1518         u32 n_allocated;
1519
1520         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
1521           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
1522
1523         /* multicast send - compute next multicast send time */
1524         if( radv_info->initial_adverts_sent > 0)
1525           {
1526             radv_info->initial_adverts_sent--;
1527             if(rfn > radv_info->initial_adverts_interval)
1528               rfn =  radv_info->initial_adverts_interval;
1529
1530             /* check to see if we are ceasing to send */
1531             if( radv_info->initial_adverts_sent  == 0)
1532               if(radv_info->cease_radv)
1533                 radv_info->send_radv = 0;
1534           }
1535
1536         radv_info->next_multicast_time =  rfn + now;
1537         radv_info->last_multicast_time = now;
1538
1539         /* send advert now - build a "solicted" router advert with unspecified source address */
1540         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
1541
1542         if (PREDICT_FALSE(n_allocated == 0))
1543           {
1544             clib_warning ("buffer allocation failure");
1545             continue;
1546           }
1547         b0 = vlib_get_buffer (vm, bo0);
1548         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
1549         b0->error = ICMP6_ERROR_NONE;
1550         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
1551
1552         h0 =  vlib_buffer_get_current (b0);
1553
1554         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
1555
1556         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
1557         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
1558                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
1559         h0->ip.protocol = IP_PROTOCOL_ICMP6;
1560         h0->ip.hop_limit = 255;
1561
1562         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
1563         h0->ip.src_address.as_u64[0] = 0;
1564         h0->ip.src_address.as_u64[1] = 0;
1565
1566         h0->ip.dst_address.as_u64[0] = 0;
1567         h0->ip.dst_address.as_u64[1] = 0;
1568
1569         h0->neighbor.icmp.type = ICMP6_router_solicitation;
1570
1571         if (PREDICT_FALSE(f == 0))
1572           {
1573             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
1574             to_next = vlib_frame_vector_args (f);
1575             n_left_to_next = VLIB_FRAME_SIZE;
1576             n_this_frame = 0;
1577           }
1578
1579         n_this_frame++;
1580         n_left_to_next--;
1581         to_next[0] = bo0;
1582         to_next += 1;
1583
1584         if (PREDICT_FALSE(n_left_to_next == 0))
1585           {
1586             f->n_vectors = n_this_frame;
1587             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1588             f = 0;
1589           }
1590       }
1591   }));
1592   /* *INDENT-ON* */
1593
1594   if (f)
1595     {
1596       ASSERT (n_this_frame);
1597       f->n_vectors = n_this_frame;
1598       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1599     }
1600   return 0;
1601 }
1602
1603 static void
1604 ip6_ra_handle_report (const ip6_ra_report_t * rap)
1605 {
1606   u32 ii;
1607
1608   vec_foreach_index (ii, ip6_ra_listeners) ip6_ra_listeners[ii] (rap);
1609 }
1610
1611 static uword
1612 ip6_ra_event_process (vlib_main_t * vm,
1613                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1614 {
1615   ip6_ra_report_t *r, *rs;
1616   uword event_type;
1617
1618   /* init code here */
1619
1620   while (1)
1621     {
1622       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
1623
1624       rs = vlib_process_get_event_data (vm, &event_type);
1625
1626       if (NULL == rs)
1627         {
1628           /* No events found: timer expired. */
1629           /* process interface list and send RAs as appropriate, update timer info */
1630           ip6_ra_process_timer_event (vm, node, frame);
1631         }
1632       else
1633         {
1634           vec_foreach (r, rs) ip6_ra_handle_report (r);
1635           vec_reset_length (rs);
1636         }
1637     }
1638   return frame->n_vectors;
1639 }
1640
1641 VLIB_REGISTER_NODE (ip6_ra_process_node) =
1642 {
1643 .function = ip6_ra_event_process,.name = "ip6-ra-process",.type =
1644     VLIB_NODE_TYPE_PROCESS,};
1645
1646 static void
1647 ip6_ra_signal_report (ip6_ra_report_t * r)
1648 {
1649   vlib_main_t *vm = vlib_get_main ();
1650   ip6_ra_report_t *q;
1651
1652   if (!vec_len (ip6_ra_listeners))
1653     return;
1654
1655   q = vlib_process_signal_event_data (vm,
1656                                       ip6_ra_process_node.index,
1657                                       0, 1, sizeof *q);
1658   *q = *r;
1659 }
1660
1661 static int
1662 ip6_ra_publish (ip6_ra_report_t * r)
1663 {
1664   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
1665   vl_api_rpc_call_main_thread (ip6_ra_signal_report, (u8 *) r, sizeof *r);
1666   return 0;
1667 }
1668
1669 /* API support functions */
1670 int
1671 ip6_ra_config (vlib_main_t * vm, u32 sw_if_index,
1672                u8 suppress, u8 managed, u8 other,
1673                u8 ll_option, u8 send_unicast, u8 cease,
1674                u8 use_lifetime, u32 lifetime,
1675                u32 initial_count, u32 initial_interval,
1676                u32 max_interval, u32 min_interval, u8 is_no)
1677 {
1678   ip6_ra_t *radv_info;
1679
1680   /* look up the radv_t  information for this interface */
1681   radv_info = ip6_ra_get_itf (sw_if_index);
1682
1683   if (!radv_info)
1684     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1685
1686   if ((max_interval != 0) && (min_interval == 0))
1687     min_interval = .75 * max_interval;
1688
1689   max_interval =
1690     (max_interval !=
1691      0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
1692     radv_info->max_radv_interval;
1693   min_interval =
1694     (min_interval !=
1695      0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
1696     radv_info->min_radv_interval;
1697   lifetime =
1698     (use_lifetime !=
1699      0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
1700     radv_info->adv_router_lifetime_in_sec;
1701
1702   if (lifetime)
1703     {
1704       if (lifetime > MAX_DEF_RTR_LIFETIME)
1705         lifetime = MAX_DEF_RTR_LIFETIME;
1706
1707       if (lifetime <= max_interval)
1708         return VNET_API_ERROR_INVALID_VALUE;
1709     }
1710
1711   if (min_interval != 0)
1712     {
1713       if ((min_interval > .75 * max_interval) || (min_interval < 3))
1714         return VNET_API_ERROR_INVALID_VALUE;
1715     }
1716
1717   if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
1718       (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
1719     return VNET_API_ERROR_INVALID_VALUE;
1720
1721   /*
1722      if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
1723      if "flag" is clear  don't change corresponding value
1724    */
1725   radv_info->send_radv =
1726     (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
1727   radv_info->adv_managed_flag =
1728     (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
1729   radv_info->adv_other_flag =
1730     (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
1731   radv_info->adv_link_layer_address =
1732     (ll_option != 0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
1733   radv_info->send_unicast =
1734     (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
1735   radv_info->cease_radv =
1736     (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
1737
1738   radv_info->min_radv_interval = min_interval;
1739   radv_info->max_radv_interval = max_interval;
1740   radv_info->adv_router_lifetime_in_sec = lifetime;
1741
1742   radv_info->initial_adverts_count =
1743     (initial_count !=
1744      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
1745     radv_info->initial_adverts_count;
1746   radv_info->initial_adverts_interval =
1747     (initial_interval !=
1748      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
1749     radv_info->initial_adverts_interval;
1750
1751   /* restart */
1752   if ((cease != 0) && (is_no))
1753     radv_info->send_radv = 1;
1754
1755   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1756   radv_info->next_multicast_time = vlib_time_now (vm);
1757   radv_info->last_multicast_time = vlib_time_now (vm);
1758   radv_info->last_radv_time = 0;
1759
1760   return (0);
1761 }
1762
1763
1764 int
1765 ip6_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
1766                ip6_address_t * prefix_addr, u8 prefix_len,
1767                u8 use_default, u32 val_lifetime, u32 pref_lifetime,
1768                u8 no_advertise, u8 off_link, u8 no_autoconfig,
1769                u8 no_onlink, u8 is_no)
1770 {
1771   ip6_ra_t *radv_info;
1772
1773   /* look up the radv_t  information for this interface */
1774   radv_info = ip6_ra_get_itf (sw_if_index);
1775
1776   if (!radv_info)
1777     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1778
1779   f64 now = vlib_time_now (vm);
1780
1781   /* prefix info add, delete or update */
1782   ip6_radv_prefix_t *prefix;
1783
1784   /* lookup  prefix info for this  address on this interface */
1785   uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
1786
1787   prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
1788
1789   if (is_no)
1790     {
1791       /* delete */
1792       if (!prefix)
1793         return VNET_API_ERROR_INVALID_VALUE;    /* invalid prefix */
1794
1795       if (prefix->prefix_len != prefix_len)
1796         return VNET_API_ERROR_INVALID_VALUE_2;
1797
1798       /* FIXME - Should the DP do this or the CP ? */
1799       /* do specific delete processing here before returning */
1800       /* try to remove from routing table */
1801
1802       mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
1803                    /* old_value */ 0);
1804       pool_put (radv_info->adv_prefixes_pool, prefix);
1805
1806       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1807       radv_info->next_multicast_time = vlib_time_now (vm);
1808       radv_info->last_multicast_time = vlib_time_now (vm);
1809       radv_info->last_radv_time = 0;
1810       return (0);
1811     }
1812
1813   /* adding or changing */
1814   if (!prefix)
1815     {
1816       /* add */
1817       u32 pi;
1818       pool_get_zero (radv_info->adv_prefixes_pool, prefix);
1819       pi = prefix - radv_info->adv_prefixes_pool;
1820       mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
1821                  /* old_value */ 0);
1822
1823       clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
1824
1825       prefix->prefix_len = prefix_len;
1826       clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
1827
1828       /* initialize default values */
1829       prefix->adv_on_link_flag = 1;     /* L bit set */
1830       prefix->adv_autonomous_flag = 1;  /* A bit set */
1831       prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
1832       prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
1833       prefix->enabled = 1;
1834       prefix->decrement_lifetime_flag = 1;
1835       prefix->deprecated_prefix_flag = 1;
1836
1837       if (off_link == 0)
1838         {
1839           /* FIXME - Should the DP do this or the CP ? */
1840           /* insert prefix into routing table as a connected prefix */
1841         }
1842
1843       if (use_default)
1844         goto restart;
1845     }
1846   else
1847     {
1848
1849       if (prefix->prefix_len != prefix_len)
1850         return VNET_API_ERROR_INVALID_VALUE_2;
1851
1852       if (off_link != 0)
1853         {
1854           /* FIXME - Should the DP do this or the CP ? */
1855           /* remove from routing table if already there */
1856         }
1857     }
1858
1859   if ((val_lifetime == ~0) || (pref_lifetime == ~0))
1860     {
1861       prefix->adv_valid_lifetime_in_secs = ~0;
1862       prefix->adv_pref_lifetime_in_secs = ~0;
1863       prefix->decrement_lifetime_flag = 0;
1864     }
1865   else
1866     {
1867       prefix->adv_valid_lifetime_in_secs = val_lifetime;;
1868       prefix->adv_pref_lifetime_in_secs = pref_lifetime;
1869     }
1870
1871   /* copy  remaining */
1872   prefix->enabled = !(no_advertise != 0);
1873   prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
1874   prefix->adv_autonomous_flag = !(no_autoconfig != 0);
1875
1876 restart:
1877   /* restart */
1878   /* fill in the expiration times  */
1879   prefix->valid_lifetime_expires = now + prefix->adv_valid_lifetime_in_secs;
1880   prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
1881
1882   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1883   radv_info->next_multicast_time = vlib_time_now (vm);
1884   radv_info->last_multicast_time = vlib_time_now (vm);
1885   radv_info->last_radv_time = 0;
1886
1887   return (0);
1888 }
1889
1890 clib_error_t *
1891 ip6_ra_cmd (vlib_main_t * vm,
1892             unformat_input_t * main_input, vlib_cli_command_t * cmd)
1893 {
1894   vnet_main_t *vnm = vnet_get_main ();
1895   clib_error_t *error = 0;
1896   u8 is_no = 0;
1897   u8 suppress = 0, managed = 0, other = 0;
1898   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
1899   u8 use_lifetime = 0;
1900   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
1901     0, ra_initial_interval = 0;
1902   u32 ra_max_interval = 0, ra_min_interval = 0;
1903
1904   unformat_input_t _line_input, *line_input = &_line_input;
1905
1906   int add_radv_info = 1;
1907   ip6_address_t ip6_addr;
1908   u32 addr_len;
1909
1910
1911   /* Get a line of input. */
1912   if (!unformat_user (main_input, unformat_line_input, line_input))
1913     return 0;
1914
1915   /* get basic radv info for this interface */
1916   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1917     {
1918
1919       if (unformat_user (line_input,
1920                          unformat_vnet_sw_interface, vnm, &sw_if_index))
1921         {
1922           if (!ip6_ra_get_eth_itf (sw_if_index))
1923             {
1924               error =
1925                 clib_error_return (0, "Interface must be of ethernet type");
1926               goto done;
1927             }
1928
1929           if (!ip6_link_is_enabled (sw_if_index))
1930             {
1931               error = clib_error_return (0, "IP6 nt enabler interface %U'",
1932                                          format_unformat_error, line_input);
1933               goto done;
1934             }
1935         }
1936       else
1937         {
1938           error = clib_error_return (0, "invalid interface name %U'",
1939                                      format_unformat_error, line_input);
1940           goto done;
1941         }
1942     }
1943
1944   /* get the rest of the command */
1945   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1946     {
1947       if (unformat (line_input, "no"))
1948         is_no = 1;
1949       else if (unformat (line_input, "prefix %U/%d",
1950                          unformat_ip6_address, &ip6_addr, &addr_len))
1951         {
1952           add_radv_info = 0;
1953         }
1954       else if (unformat (line_input, "ra-managed-config-flag"))
1955         {
1956           managed = 1;
1957         }
1958       else if (unformat (line_input, "ra-other-config-flag"))
1959         {
1960           other = 1;
1961         }
1962       else if (unformat (line_input, "ra-suppress") ||
1963                unformat (line_input, "ra-surpress"))
1964         {
1965           suppress = 1;
1966         }
1967       else if (unformat (line_input, "ra-suppress-link-layer") ||
1968                unformat (line_input, "ra-surpress-link-layer"))
1969         {
1970           suppress_ll_option = 1;
1971         }
1972       else if (unformat (line_input, "ra-send-unicast"))
1973         {
1974           send_unicast = 1;
1975         }
1976       else if (unformat (line_input, "ra-lifetime"))
1977         {
1978           if (!unformat (line_input, "%d", &ra_lifetime))
1979             {
1980               error = unformat_parse_error (line_input);
1981               goto done;
1982             }
1983           use_lifetime = 1;
1984         }
1985       else if (unformat (line_input, "ra-initial"))
1986         {
1987           if (!unformat
1988               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
1989             {
1990               error = unformat_parse_error (line_input);
1991               goto done;
1992             }
1993         }
1994       else if (unformat (line_input, "ra-interval"))
1995         {
1996           if (!unformat (line_input, "%d", &ra_max_interval))
1997             {
1998               error = unformat_parse_error (line_input);
1999               goto done;
2000             }
2001
2002           if (!unformat (line_input, "%d", &ra_min_interval))
2003             ra_min_interval = 0;
2004         }
2005       else if (unformat (line_input, "ra-cease"))
2006         {
2007           cease = 1;
2008         }
2009       else
2010         {
2011           error = unformat_parse_error (line_input);
2012           goto done;
2013         }
2014     }
2015
2016   if (add_radv_info)
2017     {
2018       ip6_ra_config (vm, sw_if_index,
2019                      suppress, managed, other,
2020                      suppress_ll_option, send_unicast, cease,
2021                      use_lifetime, ra_lifetime,
2022                      ra_initial_count, ra_initial_interval,
2023                      ra_max_interval, ra_min_interval, is_no);
2024     }
2025   else
2026     {
2027       u32 valid_lifetime_in_secs = 0;
2028       u32 pref_lifetime_in_secs = 0;
2029       u8 use_prefix_default_values = 0;
2030       u8 no_advertise = 0;
2031       u8 off_link = 0;
2032       u8 no_autoconfig = 0;
2033       u8 no_onlink = 0;
2034
2035       /* get the rest of the command */
2036       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2037         {
2038           if (unformat (line_input, "default"))
2039             {
2040               use_prefix_default_values = 1;
2041               break;
2042             }
2043           else if (unformat (line_input, "infinite"))
2044             {
2045               valid_lifetime_in_secs = ~0;
2046               pref_lifetime_in_secs = ~0;
2047               break;
2048             }
2049           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
2050                              &pref_lifetime_in_secs))
2051             break;
2052           else
2053             break;
2054         }
2055
2056
2057       /* get the rest of the command */
2058       while (!use_prefix_default_values &&
2059              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2060         {
2061           if (unformat (line_input, "no-advertise"))
2062             no_advertise = 1;
2063           else if (unformat (line_input, "off-link"))
2064             off_link = 1;
2065           else if (unformat (line_input, "no-autoconfig"))
2066             no_autoconfig = 1;
2067           else if (unformat (line_input, "no-onlink"))
2068             no_onlink = 1;
2069           else
2070             {
2071               error = unformat_parse_error (line_input);
2072               goto done;
2073             }
2074         }
2075
2076       ip6_ra_prefix (vm, sw_if_index,
2077                      &ip6_addr, addr_len,
2078                      use_prefix_default_values,
2079                      valid_lifetime_in_secs,
2080                      pref_lifetime_in_secs,
2081                      no_advertise, off_link, no_autoconfig, no_onlink, is_no);
2082     }
2083
2084 done:
2085   unformat_free (line_input);
2086
2087   return error;
2088 }
2089
2090 static u8 *
2091 format_ip6_ra (u8 * s, va_list * args)
2092 {
2093   index_t rai = va_arg (*args, index_t);
2094   u32 indent = va_arg (*args, u32);
2095   ip6_radv_prefix_t *p;
2096   ip6_ra_t *radv_info;
2097
2098   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
2099
2100   s = format (s, "%UAdvertised Prefixes:\n", format_white_space, indent);
2101
2102   indent += 2;
2103
2104   /* *INDENT-OFF* */
2105   pool_foreach (p, radv_info->adv_prefixes_pool,
2106   ({
2107     s = format (s, "%Uprefix %U, length %d\n",
2108                 format_white_space, indent+2,
2109                 format_ip6_address, &p->prefix, p->prefix_len);
2110   }));
2111   /* *INDENT-ON* */
2112
2113   s = format (s, "%UMTU is %d\n",
2114               format_white_space, indent, radv_info->adv_link_mtu);
2115   s = format (s, "%UICMP error messages are unlimited\n",
2116               format_white_space, indent);
2117   s = format (s, "%UICMP redirects are disabled\n",
2118               format_white_space, indent);
2119   s = format (s, "%UICMP unreachables are not sent\n",
2120               format_white_space, indent);
2121   s = format (s, "%UND DAD is disabled\n", format_white_space, indent);
2122   //s = format (s, "%UND reachable time is %d milliseconds\n",);
2123   s = format (s, "%UND advertised reachable time is %d\n",
2124               format_white_space, indent,
2125               radv_info->adv_neighbor_reachable_time_in_msec);
2126   s = format (s,
2127               "%UND advertised retransmit interval is %d (msec)\n",
2128               format_white_space, indent,
2129               radv_info->
2130               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
2131   s =
2132     format (s,
2133             "%UND router advertisements are sent every %0.1f seconds (min interval is %0.1f)\n",
2134             format_white_space, indent, radv_info->max_radv_interval,
2135             radv_info->min_radv_interval);
2136   s =
2137     format (s, "%UND router advertisements live for %d seconds\n",
2138             format_white_space, indent,
2139             radv_info->adv_router_lifetime_in_sec);
2140   s =
2141     format (s, "%UHosts %s stateless autoconfig for addresses\n",
2142             format_white_space, indent,
2143             (radv_info->adv_managed_flag) ? "use" : " don't use");
2144   s =
2145     format (s, "%UND router advertisements sent %d\n", format_white_space,
2146             indent, radv_info->n_advertisements_sent);
2147   s =
2148     format (s, "%UND router solicitations received %d\n", format_white_space,
2149             indent, radv_info->n_solicitations_rcvd);
2150   s =
2151     format (s, "%UND router solicitations dropped %d\n", format_white_space,
2152             indent, radv_info->n_solicitations_dropped);
2153
2154   return (s);
2155 }
2156
2157
2158 /*?
2159  * This command is used to configure the neighbor discovery
2160  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
2161  * command to display some of the current neighbor discovery parameters
2162  * on a given interface. This command has three formats:
2163  *
2164  *
2165  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
2166  *
2167  * '<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>'
2168  *
2169  * Where:
2170  *
2171  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
2172  * router-advertisement messages to use stateful address
2173  * auto-configuration to obtain address information (sets the M-bit).
2174  * Default is the M-bit is not set and the '<em>no</em>' option
2175  * returns it to this default state.
2176  *
2177  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
2178  * router-advertisement messages that hosts use stateful auto
2179  * configuration to obtain nonaddress related information (sets
2180  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
2181  * option returns it to this default state.
2182  *
2183  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
2184  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
2185  * router-advertisement messages.
2186  *
2187  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
2188  * optional source link-layer address in the ICMPv6 router-advertisement
2189  * messages. Default is to include the optional source link-layer address
2190  * and the '<em>no</em>' option returns it to this default state.
2191  *
2192  * <em>[no] ra-send-unicast</em> - Use the source address of the
2193  * router-solicitation message if availiable. The default is to use
2194  * multicast address of all nodes, and the '<em>no</em>' option returns
2195  * it to this default state.
2196  *
2197  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
2198  * default router in ICMPv6 router-advertisement messages. The range is
2199  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
2200  * '<em><max-interval></em>'. The default value is 600 seconds and the
2201  * '<em>no</em>' option returns it to this default value.
2202  *
2203  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
2204  * router-advertisement messages sent and the interval between each
2205  * message. Range for count is 1 - 3 and default is 3. Range for interval
2206  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
2207  * returns both to their default value.
2208  *
2209  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
2210  * interval between sending ICMPv6 router-advertisement messages. The
2211  * range for max-interval is from 4 to 200 seconds. min-interval can not
2212  * be more than 75% of max-interval. If not set, min-interval will be
2213  * set to 75% of max-interval. The range for min-interval is from 3 to
2214  * 150 seconds.  The '<em>no</em>' option returns both to their default
2215  * value.
2216  *
2217  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
2218  * The '<em>no</em>' options implies to start (or restart) sending
2219  * ICMPv6 router-advertisement messages.
2220  *
2221  *
2222  * <b>Format 2 - Prefix Options:</b>
2223  *
2224  * '<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>'
2225  *
2226  * Where:
2227  *
2228  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
2229  *
2230  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
2231  * length of time in seconds during what the prefix is valid for the purpose of
2232  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
2233  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
2234  * length of time in seconds during what addresses generated from the prefix remain
2235  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
2236  *
2237  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
2238  * are inifinte, no timeout.
2239  *
2240  * <em>no-advertise</em> - Do not send full router address in prefix
2241  * advertisement. Default is to advertise (i.e. - This flag is off by default).
2242  *
2243  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
2244  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
2245  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
2246  *
2247  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
2248  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
2249  *
2250  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
2251  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
2252  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
2253  * the L-bit.
2254  *
2255  *
2256  * <b>Format 3: - Default of Prefix:</b>
2257  *
2258  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
2259  *
2260  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
2261  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
2262  * is ignored and the prefix is deleted.
2263  *
2264  *
2265  * @cliexpar
2266  * Example of how set a router advertisement option:
2267  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
2268  * Example of how to add a prefix:
2269  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
2270  * Example of how to delete a prefix:
2271  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
2272 ?*/
2273 /* *INDENT-OFF* */
2274 VLIB_CLI_COMMAND (ip6_nd_command, static) =
2275 {
2276   .path = "ip6 nd",
2277   .short_help = "ip6 nd <interface> ...",
2278   .function = ip6_ra_cmd,
2279 };
2280 /* *INDENT-ON* */
2281
2282 /**
2283  * VFT for registering as a delegate to an IP6 link
2284  */
2285 const static ip6_link_delegate_vft_t ip6_ra_delegate_vft = {
2286   .ildv_disable = ip6_ra_delegate_disable,
2287   .ildv_enable = ip6_ra_link_enable,
2288   .ildv_format = format_ip6_ra,
2289 };
2290
2291 static clib_error_t *
2292 ip6_ra_init (vlib_main_t * vm)
2293 {
2294   vlib_call_init_function (vm, icmp6_init);
2295
2296   icmp6_register_type (vm, ICMP6_router_solicitation,
2297                        ip6_icmp_router_solicitation_node.index);
2298   icmp6_register_type (vm, ICMP6_router_advertisement,
2299                        ip6_icmp_router_advertisement_node.index);
2300
2301   ip6_ra_delegate_id = ip6_link_delegate_register (&ip6_ra_delegate_vft);
2302
2303   return (NULL);
2304 }
2305
2306 /* *INDENT-OFF* */
2307 VLIB_INIT_FUNCTION (ip6_ra_init) =
2308 {
2309   .runs_after = VLIB_INITS("icmp6_init"),
2310 };
2311 /* *INDENT-ON* */
2312
2313 /*
2314  * fd.io coding-style-patch-verification: ON
2315  *
2316  * Local Variables:
2317  * eval: (c-set-style "gnu")
2318  * End:
2319  */