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   ci0 = vlib_get_buffer_index (vm, c0);
1223
1224   f = vlib_get_frame_to_node (vm, next_index);
1225   to_next = vlib_frame_vector_args (f);
1226   to_next[0] = ci0;
1227   f->n_vectors = 1;
1228   vlib_put_frame_to_node (vm, next_index, f);
1229
1230   if (params->mrc != 0 && --radv_info->n_left == 0)
1231     stop_sending_rs (vm, radv_info);
1232   else
1233     {
1234       radv_info->sleep_interval =
1235         (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
1236       if (radv_info->sleep_interval > params->mrt)
1237         radv_info->sleep_interval =
1238           (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
1239
1240       radv_info->due_time = current_time + radv_info->sleep_interval;
1241
1242       if (params->mrd != 0
1243           && current_time > radv_info->start_time + params->mrd)
1244         stop_sending_rs (vm, radv_info);
1245       else
1246         *due_time = radv_info->due_time;
1247     }
1248
1249   return radv_info->keep_sending_rs;
1250 }
1251
1252 static uword
1253 send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1254                  vlib_frame_t * f0)
1255 {
1256   uword *event_data = NULL;
1257   f64 sleep_time = 1e9;
1258   ip6_ra_t *radv_info;
1259   f64 current_time;
1260   f64 due_time;
1261   f64 dt = 0;
1262
1263   while (true)
1264     {
1265       vlib_process_wait_for_event_or_clock (vm, sleep_time);
1266       vlib_process_get_events (vm, &event_data);
1267       vec_reset_length (event_data);
1268
1269       current_time = vlib_time_now (vm);
1270       do
1271         {
1272           due_time = current_time + 1e9;
1273         /* *INDENT-OFF* */
1274         pool_foreach (radv_info, ip6_ra_pool,
1275         ({
1276             if (check_send_rs (vm, radv_info, current_time, &dt)
1277                 && (dt < due_time))
1278               due_time = dt;
1279         }));
1280         /* *INDENT-ON* */
1281           current_time = vlib_time_now (vm);
1282         }
1283       while (due_time < current_time);
1284
1285       sleep_time = due_time - current_time;
1286     }
1287
1288   return 0;
1289 }
1290
1291 /* *INDENT-OFF* */
1292 VLIB_REGISTER_NODE (ip6_rs_process_node) = {
1293     .function = send_rs_process,
1294     .type = VLIB_NODE_TYPE_PROCESS,
1295     .name = "ip6-rs-process",
1296 };
1297 /* *INDENT-ON* */
1298
1299 void
1300 icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
1301                                 const icmp6_send_router_solicitation_params_t
1302                                 * params)
1303 {
1304   ip6_ra_t *ra;
1305
1306   ASSERT (~0 != sw_if_index);
1307
1308   ra = ip6_ra_get_itf (sw_if_index);
1309
1310   if (!ra)
1311     return;
1312
1313   stop_sending_rs (vm, ra);
1314
1315   if (!stop)
1316     {
1317       ra->keep_sending_rs = 1;
1318       ra->params = *params;
1319       ra->n_left = params->mrc;
1320       ra->start_time = vlib_time_now (vm);
1321       ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
1322       ra->due_time = 0;         /* send first packet ASAP */
1323       ra->buffer = create_buffer_for_rs (vm, ra);
1324       if (!ra->buffer)
1325         ra->keep_sending_rs = 0;
1326       else
1327         vlib_process_signal_event (vm, ip6_rs_process_node.index, 1, 0);
1328     }
1329 }
1330
1331 static const ethernet_interface_t *
1332 ip6_ra_get_eth_itf (u32 sw_if_index)
1333 {
1334   const vnet_sw_interface_t *sw;
1335
1336   /* lookup radv container  - ethernet interfaces only */
1337   sw = vnet_get_sup_sw_interface (vnet_get_main (), sw_if_index);
1338   if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
1339     return (ethernet_get_interface (&ethernet_main, sw->hw_if_index));
1340
1341   return (NULL);
1342 }
1343
1344 /**
1345  * @brief called when IP6 is enabled on an interface
1346  *create and initialize router advertisement parameters with default
1347  * values for this intfc
1348  */
1349 static void
1350 ip6_ra_link_enable (u32 sw_if_index)
1351 {
1352   const ethernet_interface_t *eth;
1353   ip6_ra_t *radv_info;
1354
1355   eth = ip6_ra_get_eth_itf (sw_if_index);
1356
1357   if (NULL == eth)
1358     return;
1359
1360   ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index,
1361                                                   ip6_ra_delegate_id));
1362
1363   pool_get_zero (ip6_ra_pool, radv_info);
1364
1365   radv_info->seed = (u32) clib_cpu_time_now ();
1366   random_u32 (&radv_info->seed);
1367
1368   radv_info->sw_if_index = sw_if_index;
1369   radv_info->max_radv_interval = DEF_MAX_RADV_INTERVAL;
1370   radv_info->min_radv_interval = DEF_MIN_RADV_INTERVAL;
1371   radv_info->curr_hop_limit = DEF_CURR_HOP_LIMIT;
1372   radv_info->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
1373
1374   /* send ll address source address option */
1375   radv_info->adv_link_layer_address = 1;
1376
1377   radv_info->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
1378   radv_info->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
1379   radv_info->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
1380
1381   radv_info->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
1382   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1383   radv_info->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1384
1385   /* deafult is to send */
1386   radv_info->send_radv = 1;
1387
1388   /* fill in delegate for this interface that will be needed later */
1389   radv_info->adv_link_mtu =
1390     vnet_sw_interface_get_mtu (vnet_get_main (), sw_if_index, VNET_MTU_IP6);
1391
1392   mhash_init (&radv_info->address_to_prefix_index, sizeof (uword),
1393               sizeof (ip6_address_t));
1394
1395   ip6_link_delegate_update (sw_if_index, ip6_ra_delegate_id,
1396                             radv_info - ip6_ra_pool);
1397 }
1398
1399 static void
1400 ip6_ra_delegate_disable (index_t rai)
1401 {
1402   ip6_radv_prefix_t *p;
1403   ip6_ra_t *radv_info;
1404
1405   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
1406
1407   /* clean up prefix and MDP pools */
1408   /* *INDENT-OFF* */
1409   pool_flush(p, radv_info->adv_prefixes_pool,
1410   ({
1411     mhash_unset (&radv_info->address_to_prefix_index, &p->prefix, 0);
1412   }));
1413   /* *INDENT-ON* */
1414
1415   pool_free (radv_info->adv_prefixes_pool);
1416
1417   mhash_free (&radv_info->address_to_prefix_index);
1418
1419   pool_put (ip6_ra_pool, radv_info);
1420 }
1421
1422 void
1423 ip6_ra_update_secondary_radv_info (ip6_address_t * address, u8 prefix_len,
1424                                    u32 primary_sw_if_index,
1425                                    u32 valid_time, u32 preferred_time)
1426 {
1427   vlib_main_t *vm = vlib_get_main ();
1428   static u32 *radv_indices;
1429   ip6_ra_t *radv_info;
1430   int i;
1431   ip6_address_t mask;
1432   ip6_address_mask_from_width (&mask, prefix_len);
1433
1434   vec_reset_length (radv_indices);
1435   /* *INDENT-OFF* */
1436   pool_foreach (radv_info, ip6_ra_pool,
1437   ({
1438     vec_add1 (radv_indices, radv_info - ip6_ra_pool);
1439   }));
1440   /* *INDENT-ON* */
1441
1442   /*
1443    * If we have another customer for this prefix,
1444    * tell the RA code about it...
1445    */
1446   for (i = 0; i < vec_len (radv_indices); i++)
1447     {
1448       ip6_radv_prefix_t *this_prefix;
1449       radv_info = pool_elt_at_index (ip6_ra_pool, radv_indices[i]);
1450
1451       /* We already took care of these timers... */
1452       if (radv_info->sw_if_index == primary_sw_if_index)
1453         continue;
1454
1455       /* *INDENT-OFF* */
1456       pool_foreach (this_prefix, radv_info->adv_prefixes_pool,
1457       ({
1458         if (this_prefix->prefix_len == prefix_len
1459             && ip6_address_is_equal_masked (&this_prefix->prefix, address,
1460                                             &mask))
1461           {
1462             int rv = ip6_ra_prefix (vm,
1463                                     radv_info->sw_if_index,
1464                                     address,
1465                                     prefix_len,
1466                                     0 /* use_default */,
1467                                     valid_time,
1468                                     preferred_time,
1469                                     0 /* no_advertise */,
1470                                     0 /* off_link */,
1471                                     0 /* no_autoconfig */,
1472                                     0 /* no_onlink */,
1473                                     0 /* is_no */);
1474             if (rv != 0)
1475               clib_warning ("ip6_neighbor_ra_prefix returned %d", rv);
1476           }
1477       }));
1478       /* *INDENT-ON*/
1479     }
1480 }
1481
1482 /* send a RA or update the timer info etc.. */
1483 static uword
1484 ip6_ra_process_timer_event (vlib_main_t * vm,
1485                             vlib_node_runtime_t * node, vlib_frame_t * frame)
1486 {
1487   vnet_main_t *vnm = vnet_get_main ();
1488   ip6_ra_t *radv_info;
1489   vlib_frame_t *f = 0;
1490   u32 n_this_frame = 0;
1491   u32 n_left_to_next = 0;
1492   u32 *to_next = 0;
1493   u32 bo0;
1494   icmp6_router_solicitation_header_t *h0;
1495   vlib_buffer_t *b0;
1496   f64 now = vlib_time_now (vm);
1497
1498   /* Interface ip6 radv info list */
1499   /* *INDENT-OFF* */
1500   pool_foreach (radv_info, ip6_ra_pool,
1501   ({
1502     if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
1503       {
1504         radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
1505         radv_info->next_multicast_time = now;
1506         radv_info->last_multicast_time = now;
1507         radv_info->last_radv_time = 0;
1508         continue;
1509       }
1510
1511     /* is it time to send a multicast  RA on this interface? */
1512     if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
1513       {
1514         u32 n_to_alloc = 1;
1515         u32 n_allocated;
1516
1517         f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
1518           random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
1519
1520         /* multicast send - compute next multicast send time */
1521         if( radv_info->initial_adverts_sent > 0)
1522           {
1523             radv_info->initial_adverts_sent--;
1524             if(rfn > radv_info->initial_adverts_interval)
1525               rfn =  radv_info->initial_adverts_interval;
1526
1527             /* check to see if we are ceasing to send */
1528             if( radv_info->initial_adverts_sent  == 0)
1529               if(radv_info->cease_radv)
1530                 radv_info->send_radv = 0;
1531           }
1532
1533         radv_info->next_multicast_time =  rfn + now;
1534         radv_info->last_multicast_time = now;
1535
1536         /* send advert now - build a "solicted" router advert with unspecified source address */
1537         n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
1538
1539         if (PREDICT_FALSE(n_allocated == 0))
1540           {
1541             clib_warning ("buffer allocation failure");
1542             continue;
1543           }
1544         b0 = vlib_get_buffer (vm, bo0);
1545         b0->current_length = sizeof( icmp6_router_solicitation_header_t);
1546         b0->error = ICMP6_ERROR_NONE;
1547         vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
1548
1549         h0 =  vlib_buffer_get_current (b0);
1550
1551         clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
1552
1553         h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
1554         h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
1555                                                       - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
1556         h0->ip.protocol = IP_PROTOCOL_ICMP6;
1557         h0->ip.hop_limit = 255;
1558
1559         /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
1560         h0->ip.src_address.as_u64[0] = 0;
1561         h0->ip.src_address.as_u64[1] = 0;
1562
1563         h0->ip.dst_address.as_u64[0] = 0;
1564         h0->ip.dst_address.as_u64[1] = 0;
1565
1566         h0->neighbor.icmp.type = ICMP6_router_solicitation;
1567
1568         if (PREDICT_FALSE(f == 0))
1569           {
1570             f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
1571             to_next = vlib_frame_vector_args (f);
1572             n_left_to_next = VLIB_FRAME_SIZE;
1573             n_this_frame = 0;
1574           }
1575
1576         n_this_frame++;
1577         n_left_to_next--;
1578         to_next[0] = bo0;
1579         to_next += 1;
1580
1581         if (PREDICT_FALSE(n_left_to_next == 0))
1582           {
1583             f->n_vectors = n_this_frame;
1584             vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1585             f = 0;
1586           }
1587       }
1588   }));
1589   /* *INDENT-ON* */
1590
1591   if (f)
1592     {
1593       ASSERT (n_this_frame);
1594       f->n_vectors = n_this_frame;
1595       vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
1596     }
1597   return 0;
1598 }
1599
1600 static void
1601 ip6_ra_handle_report (const ip6_ra_report_t * rap)
1602 {
1603   u32 ii;
1604
1605   vec_foreach_index (ii, ip6_ra_listeners) ip6_ra_listeners[ii] (rap);
1606 }
1607
1608 static uword
1609 ip6_ra_event_process (vlib_main_t * vm,
1610                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1611 {
1612   ip6_ra_report_t *r, *rs;
1613   uword event_type;
1614
1615   /* init code here */
1616
1617   while (1)
1618     {
1619       vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
1620
1621       rs = vlib_process_get_event_data (vm, &event_type);
1622
1623       if (NULL == rs)
1624         {
1625           /* No events found: timer expired. */
1626           /* process interface list and send RAs as appropriate, update timer info */
1627           ip6_ra_process_timer_event (vm, node, frame);
1628         }
1629       else
1630         {
1631           vec_foreach (r, rs) ip6_ra_handle_report (r);
1632           vec_reset_length (rs);
1633         }
1634     }
1635   return frame->n_vectors;
1636 }
1637
1638 VLIB_REGISTER_NODE (ip6_ra_process_node) =
1639 {
1640 .function = ip6_ra_event_process,.name = "ip6-ra-process",.type =
1641     VLIB_NODE_TYPE_PROCESS,};
1642
1643 static void
1644 ip6_ra_signal_report (ip6_ra_report_t * r)
1645 {
1646   vlib_main_t *vm = vlib_get_main ();
1647   ip6_ra_report_t *q;
1648
1649   if (!vec_len (ip6_ra_listeners))
1650     return;
1651
1652   q = vlib_process_signal_event_data (vm,
1653                                       ip6_ra_process_node.index,
1654                                       0, 1, sizeof *q);
1655   *q = *r;
1656 }
1657
1658 static int
1659 ip6_ra_publish (ip6_ra_report_t * r)
1660 {
1661   void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
1662   vl_api_rpc_call_main_thread (ip6_ra_signal_report, (u8 *) r, sizeof *r);
1663   return 0;
1664 }
1665
1666 /* API support functions */
1667 int
1668 ip6_ra_config (vlib_main_t * vm, u32 sw_if_index,
1669                u8 suppress, u8 managed, u8 other,
1670                u8 ll_option, u8 send_unicast, u8 cease,
1671                u8 use_lifetime, u32 lifetime,
1672                u32 initial_count, u32 initial_interval,
1673                u32 max_interval, u32 min_interval, u8 is_no)
1674 {
1675   ip6_ra_t *radv_info;
1676
1677   /* look up the radv_t  information for this interface */
1678   radv_info = ip6_ra_get_itf (sw_if_index);
1679
1680   if (!radv_info)
1681     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1682
1683   if ((max_interval != 0) && (min_interval == 0))
1684     min_interval = .75 * max_interval;
1685
1686   max_interval =
1687     (max_interval !=
1688      0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
1689     radv_info->max_radv_interval;
1690   min_interval =
1691     (min_interval !=
1692      0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
1693     radv_info->min_radv_interval;
1694   lifetime =
1695     (use_lifetime !=
1696      0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
1697     radv_info->adv_router_lifetime_in_sec;
1698
1699   if (lifetime)
1700     {
1701       if (lifetime > MAX_DEF_RTR_LIFETIME)
1702         lifetime = MAX_DEF_RTR_LIFETIME;
1703
1704       if (lifetime <= max_interval)
1705         return VNET_API_ERROR_INVALID_VALUE;
1706     }
1707
1708   if (min_interval != 0)
1709     {
1710       if ((min_interval > .75 * max_interval) || (min_interval < 3))
1711         return VNET_API_ERROR_INVALID_VALUE;
1712     }
1713
1714   if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
1715       (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
1716     return VNET_API_ERROR_INVALID_VALUE;
1717
1718   /*
1719      if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
1720      if "flag" is clear  don't change corresponding value
1721    */
1722   radv_info->send_radv =
1723     (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
1724   radv_info->adv_managed_flag =
1725     (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
1726   radv_info->adv_other_flag =
1727     (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
1728   radv_info->adv_link_layer_address =
1729     (ll_option != 0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
1730   radv_info->send_unicast =
1731     (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
1732   radv_info->cease_radv =
1733     (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
1734
1735   radv_info->min_radv_interval = min_interval;
1736   radv_info->max_radv_interval = max_interval;
1737   radv_info->adv_router_lifetime_in_sec = lifetime;
1738
1739   radv_info->initial_adverts_count =
1740     (initial_count !=
1741      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
1742     radv_info->initial_adverts_count;
1743   radv_info->initial_adverts_interval =
1744     (initial_interval !=
1745      0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
1746     radv_info->initial_adverts_interval;
1747
1748   /* restart */
1749   if ((cease != 0) && (is_no))
1750     radv_info->send_radv = 1;
1751
1752   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1753   radv_info->next_multicast_time = vlib_time_now (vm);
1754   radv_info->last_multicast_time = vlib_time_now (vm);
1755   radv_info->last_radv_time = 0;
1756
1757   return (0);
1758 }
1759
1760
1761 int
1762 ip6_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
1763                ip6_address_t * prefix_addr, u8 prefix_len,
1764                u8 use_default, u32 val_lifetime, u32 pref_lifetime,
1765                u8 no_advertise, u8 off_link, u8 no_autoconfig,
1766                u8 no_onlink, u8 is_no)
1767 {
1768   ip6_ra_t *radv_info;
1769
1770   /* look up the radv_t  information for this interface */
1771   radv_info = ip6_ra_get_itf (sw_if_index);
1772
1773   if (!radv_info)
1774     return (VNET_API_ERROR_IP6_NOT_ENABLED);
1775
1776   f64 now = vlib_time_now (vm);
1777
1778   /* prefix info add, delete or update */
1779   ip6_radv_prefix_t *prefix;
1780
1781   /* lookup  prefix info for this  address on this interface */
1782   uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
1783
1784   prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
1785
1786   if (is_no)
1787     {
1788       /* delete */
1789       if (!prefix)
1790         return VNET_API_ERROR_INVALID_VALUE;    /* invalid prefix */
1791
1792       if (prefix->prefix_len != prefix_len)
1793         return VNET_API_ERROR_INVALID_VALUE_2;
1794
1795       /* FIXME - Should the DP do this or the CP ? */
1796       /* do specific delete processing here before returning */
1797       /* try to remove from routing table */
1798
1799       mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
1800                    /* old_value */ 0);
1801       pool_put (radv_info->adv_prefixes_pool, prefix);
1802
1803       radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1804       radv_info->next_multicast_time = vlib_time_now (vm);
1805       radv_info->last_multicast_time = vlib_time_now (vm);
1806       radv_info->last_radv_time = 0;
1807       return (0);
1808     }
1809
1810   /* adding or changing */
1811   if (!prefix)
1812     {
1813       /* add */
1814       u32 pi;
1815       pool_get_zero (radv_info->adv_prefixes_pool, prefix);
1816       pi = prefix - radv_info->adv_prefixes_pool;
1817       mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
1818                  /* old_value */ 0);
1819
1820       clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
1821
1822       prefix->prefix_len = prefix_len;
1823       clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
1824
1825       /* initialize default values */
1826       prefix->adv_on_link_flag = 1;     /* L bit set */
1827       prefix->adv_autonomous_flag = 1;  /* A bit set */
1828       prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
1829       prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
1830       prefix->enabled = 1;
1831       prefix->decrement_lifetime_flag = 1;
1832       prefix->deprecated_prefix_flag = 1;
1833
1834       if (off_link == 0)
1835         {
1836           /* FIXME - Should the DP do this or the CP ? */
1837           /* insert prefix into routing table as a connected prefix */
1838         }
1839
1840       if (use_default)
1841         goto restart;
1842     }
1843   else
1844     {
1845
1846       if (prefix->prefix_len != prefix_len)
1847         return VNET_API_ERROR_INVALID_VALUE_2;
1848
1849       if (off_link != 0)
1850         {
1851           /* FIXME - Should the DP do this or the CP ? */
1852           /* remove from routing table if already there */
1853         }
1854     }
1855
1856   if ((val_lifetime == ~0) || (pref_lifetime == ~0))
1857     {
1858       prefix->adv_valid_lifetime_in_secs = ~0;
1859       prefix->adv_pref_lifetime_in_secs = ~0;
1860       prefix->decrement_lifetime_flag = 0;
1861     }
1862   else
1863     {
1864       prefix->adv_valid_lifetime_in_secs = val_lifetime;;
1865       prefix->adv_pref_lifetime_in_secs = pref_lifetime;
1866     }
1867
1868   /* copy  remaining */
1869   prefix->enabled = !(no_advertise != 0);
1870   prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
1871   prefix->adv_autonomous_flag = !(no_autoconfig != 0);
1872
1873 restart:
1874   /* restart */
1875   /* fill in the expiration times  */
1876   prefix->valid_lifetime_expires = now + prefix->adv_valid_lifetime_in_secs;
1877   prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
1878
1879   radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
1880   radv_info->next_multicast_time = vlib_time_now (vm);
1881   radv_info->last_multicast_time = vlib_time_now (vm);
1882   radv_info->last_radv_time = 0;
1883
1884   return (0);
1885 }
1886
1887 clib_error_t *
1888 ip6_ra_cmd (vlib_main_t * vm,
1889             unformat_input_t * main_input, vlib_cli_command_t * cmd)
1890 {
1891   vnet_main_t *vnm = vnet_get_main ();
1892   clib_error_t *error = 0;
1893   u8 is_no = 0;
1894   u8 suppress = 0, managed = 0, other = 0;
1895   u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
1896   u8 use_lifetime = 0;
1897   u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
1898     0, ra_initial_interval = 0;
1899   u32 ra_max_interval = 0, ra_min_interval = 0;
1900
1901   unformat_input_t _line_input, *line_input = &_line_input;
1902
1903   int add_radv_info = 1;
1904   ip6_address_t ip6_addr;
1905   u32 addr_len;
1906
1907
1908   /* Get a line of input. */
1909   if (!unformat_user (main_input, unformat_line_input, line_input))
1910     return 0;
1911
1912   /* get basic radv info for this interface */
1913   if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1914     {
1915
1916       if (unformat_user (line_input,
1917                          unformat_vnet_sw_interface, vnm, &sw_if_index))
1918         {
1919           if (!ip6_ra_get_eth_itf (sw_if_index))
1920             {
1921               error =
1922                 clib_error_return (0, "Interface must be of ethernet type");
1923               goto done;
1924             }
1925
1926           if (!ip6_link_is_enabled (sw_if_index))
1927             {
1928               error = clib_error_return (0, "IP6 nt enabler interface %U'",
1929                                          format_unformat_error, line_input);
1930               goto done;
1931             }
1932         }
1933       else
1934         {
1935           error = clib_error_return (0, "invalid interface name %U'",
1936                                      format_unformat_error, line_input);
1937           goto done;
1938         }
1939     }
1940
1941   /* get the rest of the command */
1942   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1943     {
1944       if (unformat (line_input, "no"))
1945         is_no = 1;
1946       else if (unformat (line_input, "prefix %U/%d",
1947                          unformat_ip6_address, &ip6_addr, &addr_len))
1948         {
1949           add_radv_info = 0;
1950           break;
1951         }
1952       else if (unformat (line_input, "ra-managed-config-flag"))
1953         {
1954           managed = 1;
1955           break;
1956         }
1957       else if (unformat (line_input, "ra-other-config-flag"))
1958         {
1959           other = 1;
1960           break;
1961         }
1962       else if (unformat (line_input, "ra-suppress") ||
1963                unformat (line_input, "ra-surpress"))
1964         {
1965           suppress = 1;
1966           break;
1967         }
1968       else if (unformat (line_input, "ra-suppress-link-layer") ||
1969                unformat (line_input, "ra-surpress-link-layer"))
1970         {
1971           suppress_ll_option = 1;
1972           break;
1973         }
1974       else if (unformat (line_input, "ra-send-unicast"))
1975         {
1976           send_unicast = 1;
1977           break;
1978         }
1979       else if (unformat (line_input, "ra-lifetime"))
1980         {
1981           if (!unformat (line_input, "%d", &ra_lifetime))
1982             {
1983               error = unformat_parse_error (line_input);
1984               goto done;
1985             }
1986           use_lifetime = 1;
1987           break;
1988         }
1989       else if (unformat (line_input, "ra-initial"))
1990         {
1991           if (!unformat
1992               (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
1993             {
1994               error = unformat_parse_error (line_input);
1995               goto done;
1996             }
1997           break;
1998         }
1999       else if (unformat (line_input, "ra-interval"))
2000         {
2001           if (!unformat (line_input, "%d", &ra_max_interval))
2002             {
2003               error = unformat_parse_error (line_input);
2004               goto done;
2005             }
2006
2007           if (!unformat (line_input, "%d", &ra_min_interval))
2008             ra_min_interval = 0;
2009           break;
2010         }
2011       else if (unformat (line_input, "ra-cease"))
2012         {
2013           cease = 1;
2014           break;
2015         }
2016       else
2017         {
2018           error = unformat_parse_error (line_input);
2019           goto done;
2020         }
2021     }
2022
2023   if (add_radv_info)
2024     {
2025       ip6_ra_config (vm, sw_if_index,
2026                      suppress, managed, other,
2027                      suppress_ll_option, send_unicast, cease,
2028                      use_lifetime, ra_lifetime,
2029                      ra_initial_count, ra_initial_interval,
2030                      ra_max_interval, ra_min_interval, is_no);
2031     }
2032   else
2033     {
2034       u32 valid_lifetime_in_secs = 0;
2035       u32 pref_lifetime_in_secs = 0;
2036       u8 use_prefix_default_values = 0;
2037       u8 no_advertise = 0;
2038       u8 off_link = 0;
2039       u8 no_autoconfig = 0;
2040       u8 no_onlink = 0;
2041
2042       /* get the rest of the command */
2043       while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2044         {
2045           if (unformat (line_input, "default"))
2046             {
2047               use_prefix_default_values = 1;
2048               break;
2049             }
2050           else if (unformat (line_input, "infinite"))
2051             {
2052               valid_lifetime_in_secs = ~0;
2053               pref_lifetime_in_secs = ~0;
2054               break;
2055             }
2056           else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
2057                              &pref_lifetime_in_secs))
2058             break;
2059           else
2060             break;
2061         }
2062
2063
2064       /* get the rest of the command */
2065       while (!use_prefix_default_values &&
2066              unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
2067         {
2068           if (unformat (line_input, "no-advertise"))
2069             no_advertise = 1;
2070           else if (unformat (line_input, "off-link"))
2071             off_link = 1;
2072           else if (unformat (line_input, "no-autoconfig"))
2073             no_autoconfig = 1;
2074           else if (unformat (line_input, "no-onlink"))
2075             no_onlink = 1;
2076           else
2077             {
2078               error = unformat_parse_error (line_input);
2079               goto done;
2080             }
2081         }
2082
2083       ip6_ra_prefix (vm, sw_if_index,
2084                      &ip6_addr, addr_len,
2085                      use_prefix_default_values,
2086                      valid_lifetime_in_secs,
2087                      pref_lifetime_in_secs,
2088                      no_advertise, off_link, no_autoconfig, no_onlink, is_no);
2089     }
2090
2091 done:
2092   unformat_free (line_input);
2093
2094   return error;
2095 }
2096
2097 static u8 *
2098 format_ip6_ra (u8 * s, va_list * args)
2099 {
2100   index_t rai = va_arg (*args, index_t);
2101   u32 indent = va_arg (*args, u32);
2102   ip6_radv_prefix_t *p;
2103   ip6_ra_t *radv_info;
2104
2105   radv_info = pool_elt_at_index (ip6_ra_pool, rai);
2106
2107   s = format (s, "%UAdvertised Prefixes:\n", format_white_space, indent);
2108
2109   indent += 2;
2110
2111   /* *INDENT-OFF* */
2112   pool_foreach (p, radv_info->adv_prefixes_pool,
2113   ({
2114     s = format (s, "%Uprefix %U, length %d\n",
2115                 format_white_space, indent+2,
2116                 format_ip6_address, &p->prefix, p->prefix_len);
2117   }));
2118   /* *INDENT-ON* */
2119
2120   s = format (s, "%UMTU is %d\n",
2121               format_white_space, indent, radv_info->adv_link_mtu);
2122   s = format (s, "%UICMP error messages are unlimited\n",
2123               format_white_space, indent);
2124   s = format (s, "%UICMP redirects are disabled\n",
2125               format_white_space, indent);
2126   s = format (s, "%UICMP unreachables are not sent\n",
2127               format_white_space, indent);
2128   s = format (s, "%UND DAD is disabled\n", format_white_space, indent);
2129   //s = format (s, "%UND reachable time is %d milliseconds\n",);
2130   s = format (s, "%UND advertised reachable time is %d\n",
2131               format_white_space, indent,
2132               radv_info->adv_neighbor_reachable_time_in_msec);
2133   s = format (s,
2134               "%UND advertised retransmit interval is %d (msec)\n",
2135               format_white_space, indent,
2136               radv_info->
2137               adv_time_in_msec_between_retransmitted_neighbor_solicitations);
2138   s =
2139     format (s,
2140             "%UND router advertisements are sent every %0.1f seconds (min interval is %0.1f)\n",
2141             format_white_space, indent, radv_info->max_radv_interval,
2142             radv_info->min_radv_interval);
2143   s =
2144     format (s, "%UND router advertisements live for %d seconds\n",
2145             format_white_space, indent,
2146             radv_info->adv_router_lifetime_in_sec);
2147   s =
2148     format (s, "%UHosts %s stateless autoconfig for addresses\n",
2149             format_white_space, indent,
2150             (radv_info->adv_managed_flag) ? "use" : " don't use");
2151   s =
2152     format (s, "%UND router advertisements sent %d\n", format_white_space,
2153             indent, radv_info->n_advertisements_sent);
2154   s =
2155     format (s, "%UND router solicitations received %d\n", format_white_space,
2156             indent, radv_info->n_solicitations_rcvd);
2157   s =
2158     format (s, "%UND router solicitations dropped %d\n", format_white_space,
2159             indent, radv_info->n_solicitations_dropped);
2160
2161   return (s);
2162 }
2163
2164
2165 /*?
2166  * This command is used to configure the neighbor discovery
2167  * parameters on a given interface. Use the '<em>show ip6 interface</em>'
2168  * command to display some of the current neighbor discovery parameters
2169  * on a given interface. This command has three formats:
2170  *
2171  *
2172  * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
2173  *
2174  * '<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>'
2175  *
2176  * Where:
2177  *
2178  * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
2179  * router-advertisement messages to use stateful address
2180  * auto-configuration to obtain address information (sets the M-bit).
2181  * Default is the M-bit is not set and the '<em>no</em>' option
2182  * returns it to this default state.
2183  *
2184  * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
2185  * router-advertisement messages that hosts use stateful auto
2186  * configuration to obtain nonaddress related information (sets
2187  * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
2188  * option returns it to this default state.
2189  *
2190  * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
2191  * messages. The '<em>no</em>' option implies to enable sending ICMPv6
2192  * router-advertisement messages.
2193  *
2194  * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
2195  * optional source link-layer address in the ICMPv6 router-advertisement
2196  * messages. Default is to include the optional source link-layer address
2197  * and the '<em>no</em>' option returns it to this default state.
2198  *
2199  * <em>[no] ra-send-unicast</em> - Use the source address of the
2200  * router-solicitation message if availiable. The default is to use
2201  * multicast address of all nodes, and the '<em>no</em>' option returns
2202  * it to this default state.
2203  *
2204  * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
2205  * default router in ICMPv6 router-advertisement messages. The range is
2206  * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
2207  * '<em><max-interval></em>'. The default value is 600 seconds and the
2208  * '<em>no</em>' option returns it to this default value.
2209  *
2210  * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
2211  * router-advertisement messages sent and the interval between each
2212  * message. Range for count is 1 - 3 and default is 3. Range for interval
2213  * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
2214  * returns both to their default value.
2215  *
2216  * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
2217  * interval between sending ICMPv6 router-advertisement messages. The
2218  * range for max-interval is from 4 to 200 seconds. min-interval can not
2219  * be more than 75% of max-interval. If not set, min-interval will be
2220  * set to 75% of max-interval. The range for min-interval is from 3 to
2221  * 150 seconds.  The '<em>no</em>' option returns both to their default
2222  * value.
2223  *
2224  * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
2225  * The '<em>no</em>' options implies to start (or restart) sending
2226  * ICMPv6 router-advertisement messages.
2227  *
2228  *
2229  * <b>Format 2 - Prefix Options:</b>
2230  *
2231  * '<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>'
2232  *
2233  * Where:
2234  *
2235  * <em>no</em> - All additional flags are ignored and the prefix is deleted.
2236  *
2237  * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
2238  * length of time in seconds during what the prefix is valid for the purpose of
2239  * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
2240  * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
2241  * length of time in seconds during what addresses generated from the prefix remain
2242  * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
2243  *
2244  * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
2245  * are inifinte, no timeout.
2246  *
2247  * <em>no-advertise</em> - Do not send full router address in prefix
2248  * advertisement. Default is to advertise (i.e. - This flag is off by default).
2249  *
2250  * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
2251  * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
2252  * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
2253  *
2254  * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
2255  * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
2256  *
2257  * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
2258  * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
2259  * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
2260  * the L-bit.
2261  *
2262  *
2263  * <b>Format 3: - Default of Prefix:</b>
2264  *
2265  * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
2266  *
2267  * When a new prefix is added (or existing one is being overwritten) <em>default</em>
2268  * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
2269  * is ignored and the prefix is deleted.
2270  *
2271  *
2272  * @cliexpar
2273  * Example of how set a router advertisement option:
2274  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
2275  * Example of how to add a prefix:
2276  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
2277  * Example of how to delete a prefix:
2278  * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
2279 ?*/
2280 /* *INDENT-OFF* */
2281 VLIB_CLI_COMMAND (ip6_nd_command, static) =
2282 {
2283   .path = "ip6 nd",
2284   .short_help = "ip6 nd <interface> ...",
2285   .function = ip6_ra_cmd,
2286 };
2287 /* *INDENT-ON* */
2288
2289 /**
2290  * VFT for registering as a delegate to an IP6 link
2291  */
2292 const static ip6_link_delegate_vft_t ip6_ra_delegate_vft = {
2293   .ildv_disable = ip6_ra_delegate_disable,
2294   .ildv_enable = ip6_ra_link_enable,
2295   .ildv_format = format_ip6_ra,
2296 };
2297
2298 static clib_error_t *
2299 ip6_ra_init (vlib_main_t * vm)
2300 {
2301   vlib_call_init_function (vm, icmp6_init);
2302
2303   icmp6_register_type (vm, ICMP6_router_solicitation,
2304                        ip6_icmp_router_solicitation_node.index);
2305   icmp6_register_type (vm, ICMP6_router_advertisement,
2306                        ip6_icmp_router_advertisement_node.index);
2307
2308   ip6_ra_delegate_id = ip6_link_delegate_register (&ip6_ra_delegate_vft);
2309
2310   return (NULL);
2311 }
2312
2313 /* *INDENT-OFF* */
2314 VLIB_INIT_FUNCTION (ip6_ra_init) =
2315 {
2316   .runs_after = VLIB_INITS("icmp6_init"),
2317 };
2318 /* *INDENT-ON* */
2319
2320 /*
2321  * fd.io coding-style-patch-verification: ON
2322  *
2323  * Local Variables:
2324  * eval: (c-set-style "gnu")
2325  * End:
2326  */