src/plugins/map/ip6_map.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #include "map.h"
  16
  17 #include <vnet/ip/ip_frag.h>
  18 #include <vnet/ip/ip4_to_ip6.h>
  19 #include <vnet/ip/ip6_to_ip4.h>
  20
  21 enum ip6_map_next_e
  22 {
  23   IP6_MAP_NEXT_IP4_LOOKUP,
  24 #ifdef MAP_SKIP_IP6_LOOKUP
  25   IP6_MAP_NEXT_IP4_REWRITE,
  26 #endif
  27   IP6_MAP_NEXT_IP6_REASS,
  28   IP6_MAP_NEXT_IP4_REASS,
  29   IP6_MAP_NEXT_IP4_FRAGMENT,
  30   IP6_MAP_NEXT_IP6_ICMP_RELAY,
  31   IP6_MAP_NEXT_IP6_LOCAL,
  32   IP6_MAP_NEXT_DROP,
  33   IP6_MAP_NEXT_ICMP,
  34   IP6_MAP_N_NEXT,
  35 };
  36
  37 enum ip6_map_ip6_reass_next_e
  38 {
  39   IP6_MAP_IP6_REASS_NEXT_IP6_MAP,
  40   IP6_MAP_IP6_REASS_NEXT_DROP,
  41   IP6_MAP_IP6_REASS_N_NEXT,
  42 };
  43
  44 enum ip6_map_ip4_reass_next_e
  45 {
  46   IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP,
  47   IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT,
  48   IP6_MAP_IP4_REASS_NEXT_DROP,
  49   IP6_MAP_IP4_REASS_N_NEXT,
  50 };
  51
  52 enum ip6_icmp_relay_next_e
  53 {
  54   IP6_ICMP_RELAY_NEXT_IP4_LOOKUP,
  55   IP6_ICMP_RELAY_NEXT_DROP,
  56   IP6_ICMP_RELAY_N_NEXT,
  57 };
  58
  59 vlib_node_registration_t ip6_map_ip4_reass_node;
  60 vlib_node_registration_t ip6_map_ip6_reass_node;
  61 static vlib_node_registration_t ip6_map_icmp_relay_node;
  62
  63 typedef struct
  64 {
  65   u32 map_domain_index;
  66   u16 port;
  67   u8 cached;
  68 } map_ip6_map_ip4_reass_trace_t;
  69
  70 u8 *
  71 format_ip6_map_ip4_reass_trace (u8 * s, va_list * args)
  72 {
  73   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  74   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  75   map_ip6_map_ip4_reass_trace_t *t =
  76     va_arg (*args, map_ip6_map_ip4_reass_trace_t *);
  77   return format (s, "MAP domain index: %d L4 port: %u Status: %s",
  78                  t->map_domain_index, t->port,
  79                  t->cached ? "cached" : "forwarded");
  80 }
  81
  82 typedef struct
  83 {
  84   u16 offset;
  85   u16 frag_len;
  86   u8 out;
  87 } map_ip6_map_ip6_reass_trace_t;
  88
  89 u8 *
  90 format_ip6_map_ip6_reass_trace (u8 * s, va_list * args)
  91 {
  92   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  93   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  94   map_ip6_map_ip6_reass_trace_t *t =
  95     va_arg (*args, map_ip6_map_ip6_reass_trace_t *);
  96   return format (s, "Offset: %d Fragment length: %d Status: %s", t->offset,
  97                  t->frag_len, t->out ? "out" : "in");
  98 }
  99
 100 /*
 101  * ip6_map_sec_check
 102  */
 103 static_always_inline bool
 104 ip6_map_sec_check (map_domain_t * d, u16 port, ip4_header_t * ip4,
 105                    ip6_header_t * ip6)
 106 {
 107   u16 sp4 = clib_net_to_host_u16 (port);
 108   u32 sa4 = clib_net_to_host_u32 (ip4->src_address.as_u32);
 109   u64 sal6 = map_get_pfx (d, sa4, sp4);
 110   u64 sar6 = map_get_sfx (d, sa4, sp4);
 111
 112   if (PREDICT_FALSE
 113       (sal6 != clib_net_to_host_u64 (ip6->src_address.as_u64[0])
 114        || sar6 != clib_net_to_host_u64 (ip6->src_address.as_u64[1])))
 115     return (false);
 116   return (true);
 117 }
 118
 119 static_always_inline void
 120 ip6_map_security_check (map_domain_t * d, ip4_header_t * ip4,
 121                         ip6_header_t * ip6, u32 * next, u8 * error)
 122 {
 123   map_main_t *mm = &map_main;
 124   if (d->ea_bits_len || d->rules)
 125     {
 126       if (d->psid_length > 0)
 127         {
 128           if (!ip4_is_fragment (ip4))
 129             {
 130               u16 port = ip4_get_port (ip4, 1);
 131               if (port)
 132                 {
 133                   if (mm->sec_check)
 134                     *error =
 135                       ip6_map_sec_check (d, port, ip4,
 136                                          ip6) ? MAP_ERROR_NONE :
 137                       MAP_ERROR_DECAP_SEC_CHECK;
 138                 }
 139               else
 140                 {
 141                   *error = MAP_ERROR_BAD_PROTOCOL;
 142                 }
 143             }
 144           else
 145             {
 146               *next = mm->sec_check_frag ? IP6_MAP_NEXT_IP4_REASS : *next;
 147             }
 148         }
 149     }
 150 }
 151
 152 static_always_inline bool
 153 ip6_map_ip4_lookup_bypass (vlib_buffer_t * p0, ip4_header_t * ip)
 154 {
 155 #ifdef MAP_SKIP_IP6_LOOKUP
 156   if (FIB_NODE_INDEX_INVALID != pre_resolved[FIB_PROTOCOL_IP4].fei)
 157     {
 158       vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
 159         pre_resolved[FIB_PROTOCOL_IP4].dpo.dpoi_index;
 160       return (true);
 161     }
 162 #endif
 163   return (false);
 164 }
 165
 166 /*
 167  * ip6_map
 168  */
 169 static uword
 170 ip6_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 171 {
 172   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 173   vlib_node_runtime_t *error_node =
 174     vlib_node_get_runtime (vm, ip6_map_node.index);
 175   map_main_t *mm = &map_main;
 176   vlib_combined_counter_main_t *cm = mm->domain_counters;
 177   u32 thread_index = vm->thread_index;
 178
 179   from = vlib_frame_vector_args (frame);
 180   n_left_from = frame->n_vectors;
 181   next_index = node->cached_next_index;
 182   while (n_left_from > 0)
 183     {
 184       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 185
 186       /* Dual loop */
 187       while (n_left_from >= 4 && n_left_to_next >= 2)
 188         {
 189           u32 pi0, pi1;
 190           vlib_buffer_t *p0, *p1;
 191           u8 error0 = MAP_ERROR_NONE;
 192           u8 error1 = MAP_ERROR_NONE;
 193           map_domain_t *d0 = 0, *d1 = 0;
 194           ip4_header_t *ip40, *ip41;
 195           ip6_header_t *ip60, *ip61;
 196           u16 port0 = 0, port1 = 0;
 197           u32 map_domain_index0 = ~0, map_domain_index1 = ~0;
 198           u32 next0 = IP6_MAP_NEXT_IP4_LOOKUP;
 199           u32 next1 = IP6_MAP_NEXT_IP4_LOOKUP;
 200
 201           /* Prefetch next iteration. */
 202           {
 203             vlib_buffer_t *p2, *p3;
 204
 205             p2 = vlib_get_buffer (vm, from[2]);
 206             p3 = vlib_get_buffer (vm, from[3]);
 207
 208             vlib_prefetch_buffer_header (p2, LOAD);
 209             vlib_prefetch_buffer_header (p3, LOAD);
 210
 211             /* IPv6 + IPv4 header + 8 bytes of ULP */
 212             CLIB_PREFETCH (p2->data, 68, LOAD);
 213             CLIB_PREFETCH (p3->data, 68, LOAD);
 214           }
 215
 216           pi0 = to_next[0] = from[0];
 217           pi1 = to_next[1] = from[1];
 218           from += 2;
 219           n_left_from -= 2;
 220           to_next += 2;
 221           n_left_to_next -= 2;
 222
 223           p0 = vlib_get_buffer (vm, pi0);
 224           p1 = vlib_get_buffer (vm, pi1);
 225           ip60 = vlib_buffer_get_current (p0);
 226           ip61 = vlib_buffer_get_current (p1);
 227           vlib_buffer_advance (p0, sizeof (ip6_header_t));
 228           vlib_buffer_advance (p1, sizeof (ip6_header_t));
 229           ip40 = vlib_buffer_get_current (p0);
 230           ip41 = vlib_buffer_get_current (p1);
 231
 232           /*
 233            * Encapsulated IPv4 packet
 234            *   - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
 235            *   - Lookup/Rewrite or Fragment node in case of packet > MTU
 236            * Fragmented IPv6 packet
 237            * ICMP IPv6 packet
 238            *   - Error -> Pass to ICMPv6/ICMPv4 relay
 239            *   - Info -> Pass to IPv6 local
 240            * Anything else -> drop
 241            */
 242           if (PREDICT_TRUE
 243               (ip60->protocol == IP_PROTOCOL_IP_IN_IP
 244                && clib_net_to_host_u16 (ip60->payload_length) > 20))
 245             {
 246               d0 =
 247                 ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
 248                                     (ip4_address_t *) & ip40->
 249                                     src_address.as_u32, &map_domain_index0,
 250                                     &error0);
 251             }
 252           else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
 253                    clib_net_to_host_u16 (ip60->payload_length) >
 254                    sizeof (icmp46_header_t))
 255             {
 256               icmp46_header_t *icmp = (void *) (ip60 + 1);
 257               next0 = (icmp->type == ICMP6_echo_request
 258                        || icmp->type ==
 259                        ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
 260                 IP6_MAP_NEXT_IP6_ICMP_RELAY;
 261             }
 262           else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
 263             {
 264               next0 = IP6_MAP_NEXT_IP6_REASS;
 265             }
 266           else
 267             {
 268               error0 = MAP_ERROR_BAD_PROTOCOL;
 269             }
 270           if (PREDICT_TRUE
 271               (ip61->protocol == IP_PROTOCOL_IP_IN_IP
 272                && clib_net_to_host_u16 (ip61->payload_length) > 20))
 273             {
 274               d1 =
 275                 ip6_map_get_domain (vnet_buffer (p1)->ip.adj_index[VLIB_TX],
 276                                     (ip4_address_t *) & ip41->
 277                                     src_address.as_u32, &map_domain_index1,
 278                                     &error1);
 279             }
 280           else if (ip61->protocol == IP_PROTOCOL_ICMP6 &&
 281                    clib_net_to_host_u16 (ip61->payload_length) >
 282                    sizeof (icmp46_header_t))
 283             {
 284               icmp46_header_t *icmp = (void *) (ip61 + 1);
 285               next1 = (icmp->type == ICMP6_echo_request
 286                        || icmp->type ==
 287                        ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
 288                 IP6_MAP_NEXT_IP6_ICMP_RELAY;
 289             }
 290           else if (ip61->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
 291             {
 292               next1 = IP6_MAP_NEXT_IP6_REASS;
 293             }
 294           else
 295             {
 296               error1 = MAP_ERROR_BAD_PROTOCOL;
 297             }
 298
 299           if (d0)
 300             {
 301               /* MAP inbound security check */
 302               ip6_map_security_check (d0, ip40, ip60, &next0, &error0);
 303
 304               if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
 305                                 next0 == IP6_MAP_NEXT_IP4_LOOKUP))
 306                 {
 307                   if (PREDICT_FALSE
 308                       (d0->mtu
 309                        && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
 310                     {
 311                       vnet_buffer (p0)->ip_frag.flags = 0;
 312                       vnet_buffer (p0)->ip_frag.next_index =
 313                         IP4_FRAG_NEXT_IP4_LOOKUP;
 314                       vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
 315                       next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
 316                     }
 317                   else
 318                     {
 319                       next0 =
 320                         ip6_map_ip4_lookup_bypass (p0,
 321                                                    ip40) ?
 322                         IP6_MAP_NEXT_IP4_REWRITE : next0;
 323                     }
 324                   vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 325                                                    thread_index,
 326                                                    map_domain_index0, 1,
 327                                                    clib_net_to_host_u16
 328                                                    (ip40->length));
 329                 }
 330             }
 331           if (d1)
 332             {
 333               /* MAP inbound security check */
 334               ip6_map_security_check (d1, ip41, ip61, &next1, &error1);
 335
 336               if (PREDICT_TRUE (error1 == MAP_ERROR_NONE &&
 337                                 next1 == IP6_MAP_NEXT_IP4_LOOKUP))
 338                 {
 339                   if (PREDICT_FALSE
 340                       (d1->mtu
 341                        && (clib_host_to_net_u16 (ip41->length) > d1->mtu)))
 342                     {
 343                       vnet_buffer (p1)->ip_frag.flags = 0;
 344                       vnet_buffer (p1)->ip_frag.next_index =
 345                         IP4_FRAG_NEXT_IP4_LOOKUP;
 346                       vnet_buffer (p1)->ip_frag.mtu = d1->mtu;
 347                       next1 = IP6_MAP_NEXT_IP4_FRAGMENT;
 348                     }
 349                   else
 350                     {
 351                       next1 =
 352                         ip6_map_ip4_lookup_bypass (p1,
 353                                                    ip41) ?
 354                         IP6_MAP_NEXT_IP4_REWRITE : next1;
 355                     }
 356                   vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 357                                                    thread_index,
 358                                                    map_domain_index1, 1,
 359                                                    clib_net_to_host_u16
 360                                                    (ip41->length));
 361                 }
 362             }
 363
 364           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 365             {
 366               map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
 367               tr->map_domain_index = map_domain_index0;
 368               tr->port = port0;
 369             }
 370
 371           if (PREDICT_FALSE (p1->flags & VLIB_BUFFER_IS_TRACED))
 372             {
 373               map_trace_t *tr = vlib_add_trace (vm, node, p1, sizeof (*tr));
 374               tr->map_domain_index = map_domain_index1;
 375               tr->port = port1;
 376             }
 377
 378           if (error0 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
 379             {
 380               /* Set ICMP parameters */
 381               vlib_buffer_advance (p0, -sizeof (ip6_header_t));
 382               icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
 383                                            ICMP6_destination_unreachable_source_address_failed_policy,
 384                                            0);
 385               next0 = IP6_MAP_NEXT_ICMP;
 386             }
 387           else
 388             {
 389               next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
 390             }
 391
 392           if (error1 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
 393             {
 394               /* Set ICMP parameters */
 395               vlib_buffer_advance (p1, -sizeof (ip6_header_t));
 396               icmp6_error_set_vnet_buffer (p1, ICMP6_destination_unreachable,
 397                                            ICMP6_destination_unreachable_source_address_failed_policy,
 398                                            0);
 399               next1 = IP6_MAP_NEXT_ICMP;
 400             }
 401           else
 402             {
 403               next1 = (error1 == MAP_ERROR_NONE) ? next1 : IP6_MAP_NEXT_DROP;
 404             }
 405
 406           /* Reset packet */
 407           if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
 408             vlib_buffer_advance (p0, -sizeof (ip6_header_t));
 409           if (next1 == IP6_MAP_NEXT_IP6_LOCAL)
 410             vlib_buffer_advance (p1, -sizeof (ip6_header_t));
 411
 412           p0->error = error_node->errors[error0];
 413           p1->error = error_node->errors[error1];
 414           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
 415                                            n_left_to_next, pi0, pi1, next0,
 416                                            next1);
 417         }
 418
 419       /* Single loop */
 420       while (n_left_from > 0 && n_left_to_next > 0)
 421         {
 422           u32 pi0;
 423           vlib_buffer_t *p0;
 424           u8 error0 = MAP_ERROR_NONE;
 425           map_domain_t *d0 = 0;
 426           ip4_header_t *ip40;
 427           ip6_header_t *ip60;
 428           i32 port0 = 0;
 429           u32 map_domain_index0 = ~0;
 430           u32 next0 = IP6_MAP_NEXT_IP4_LOOKUP;
 431
 432           pi0 = to_next[0] = from[0];
 433           from += 1;
 434           n_left_from -= 1;
 435           to_next += 1;
 436           n_left_to_next -= 1;
 437
 438           p0 = vlib_get_buffer (vm, pi0);
 439           ip60 = vlib_buffer_get_current (p0);
 440           vlib_buffer_advance (p0, sizeof (ip6_header_t));
 441           ip40 = vlib_buffer_get_current (p0);
 442
 443           /*
 444            * Encapsulated IPv4 packet
 445            *   - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
 446            *   - Lookup/Rewrite or Fragment node in case of packet > MTU
 447            * Fragmented IPv6 packet
 448            * ICMP IPv6 packet
 449            *   - Error -> Pass to ICMPv6/ICMPv4 relay
 450            *   - Info -> Pass to IPv6 local
 451            * Anything else -> drop
 452            */
 453           if (PREDICT_TRUE
 454               (ip60->protocol == IP_PROTOCOL_IP_IN_IP
 455                && clib_net_to_host_u16 (ip60->payload_length) > 20))
 456             {
 457               d0 =
 458                 ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
 459                                     (ip4_address_t *) & ip40->
 460                                     src_address.as_u32, &map_domain_index0,
 461                                     &error0);
 462             }
 463           else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
 464                    clib_net_to_host_u16 (ip60->payload_length) >
 465                    sizeof (icmp46_header_t))
 466             {
 467               icmp46_header_t *icmp = (void *) (ip60 + 1);
 468               next0 = (icmp->type == ICMP6_echo_request
 469                        || icmp->type ==
 470                        ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
 471                 IP6_MAP_NEXT_IP6_ICMP_RELAY;
 472             }
 473           else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION &&
 474                    (((ip6_frag_hdr_t *) (ip60 + 1))->next_hdr ==
 475                     IP_PROTOCOL_IP_IN_IP))
 476             {
 477               next0 = IP6_MAP_NEXT_IP6_REASS;
 478             }
 479           else
 480             {
 481               error0 = MAP_ERROR_BAD_PROTOCOL;
 482             }
 483
 484           if (d0)
 485             {
 486               /* MAP inbound security check */
 487               ip6_map_security_check (d0, ip40, ip60, &next0, &error0);
 488
 489               if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
 490                                 next0 == IP6_MAP_NEXT_IP4_LOOKUP))
 491                 {
 492                   if (PREDICT_FALSE
 493                       (d0->mtu
 494                        && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
 495                     {
 496                       vnet_buffer (p0)->ip_frag.flags = 0;
 497                       vnet_buffer (p0)->ip_frag.next_index =
 498                         IP4_FRAG_NEXT_IP4_LOOKUP;
 499                       vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
 500                       next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
 501                     }
 502                   else
 503                     {
 504                       next0 =
 505                         ip6_map_ip4_lookup_bypass (p0,
 506                                                    ip40) ?
 507                         IP6_MAP_NEXT_IP4_REWRITE : next0;
 508                     }
 509                   vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 510                                                    thread_index,
 511                                                    map_domain_index0, 1,
 512                                                    clib_net_to_host_u16
 513                                                    (ip40->length));
 514                 }
 515             }
 516
 517           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 518             {
 519               map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
 520               tr->map_domain_index = map_domain_index0;
 521               tr->port = (u16) port0;
 522             }
 523
 524           if (mm->icmp6_enabled &&
 525               (error0 == MAP_ERROR_DECAP_SEC_CHECK
 526                || error0 == MAP_ERROR_NO_DOMAIN))
 527             {
 528               /* Set ICMP parameters */
 529               vlib_buffer_advance (p0, -sizeof (ip6_header_t));
 530               icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
 531                                            ICMP6_destination_unreachable_source_address_failed_policy,
 532                                            0);
 533               next0 = IP6_MAP_NEXT_ICMP;
 534             }
 535           else
 536             {
 537               next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
 538             }
 539
 540           /* Reset packet */
 541           if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
 542             vlib_buffer_advance (p0, -sizeof (ip6_header_t));
 543
 544           p0->error = error_node->errors[error0];
 545           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 546                                            n_left_to_next, pi0, next0);
 547         }
 548       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 549     }
 550
 551   return frame->n_vectors;
 552 }
 553
 554
 555 static_always_inline void
 556 ip6_map_ip6_reass_prepare (vlib_main_t * vm, vlib_node_runtime_t * node,
 557                            map_ip6_reass_t * r, u32 ** fragments_ready,
 558                            u32 ** fragments_to_drop)
 559 {
 560   ip4_header_t *ip40;
 561   ip6_header_t *ip60;
 562   ip6_frag_hdr_t *frag0;
 563   vlib_buffer_t *p0;
 564
 565   if (!r->ip4_header.ip_version_and_header_length)
 566     return;
 567
 568   //The IP header is here, we need to check for packets
 569   //that can be forwarded
 570   int i;
 571   for (i = 0; i < MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY; i++)
 572     {
 573       if (r->fragments[i].pi == ~0 ||
 574           ((!r->fragments[i].next_data_len)
 575            && (r->fragments[i].next_data_offset != (0xffff))))
 576         continue;
 577
 578       p0 = vlib_get_buffer (vm, r->fragments[i].pi);
 579       ip60 = vlib_buffer_get_current (p0);
 580       frag0 = (ip6_frag_hdr_t *) (ip60 + 1);
 581       ip40 = (ip4_header_t *) (frag0 + 1);
 582
 583       if (ip6_frag_hdr_offset (frag0))
 584         {
 585           //Not first fragment, add the IPv4 header
 586           clib_memcpy_fast (ip40, &r->ip4_header, 20);
 587         }
 588
 589 #ifdef MAP_IP6_REASS_COUNT_BYTES
 590       r->forwarded +=
 591         clib_net_to_host_u16 (ip60->payload_length) - sizeof (*frag0);
 592 #endif
 593
 594       if (ip6_frag_hdr_more (frag0))
 595         {
 596           //Not last fragment, we copy end of next
 597           clib_memcpy_fast (u8_ptr_add (ip60, p0->current_length),
 598                             r->fragments[i].next_data, 20);
 599           p0->current_length += 20;
 600           ip60->payload_length = u16_net_add (ip60->payload_length, 20);
 601         }
 602
 603       if (!ip4_is_fragment (ip40))
 604         {
 605           ip40->fragment_id = frag_id_6to4 (frag0->identification);
 606           ip40->flags_and_fragment_offset =
 607             clib_host_to_net_u16 (ip6_frag_hdr_offset (frag0));
 608         }
 609       else
 610         {
 611           ip40->flags_and_fragment_offset =
 612             clib_host_to_net_u16 (ip4_get_fragment_offset (ip40) +
 613                                   ip6_frag_hdr_offset (frag0));
 614         }
 615
 616       if (ip6_frag_hdr_more (frag0))
 617         ip40->flags_and_fragment_offset |=
 618           clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
 619
 620       ip40->length =
 621         clib_host_to_net_u16 (p0->current_length - sizeof (*ip60) -
 622                               sizeof (*frag0));
 623       ip40->checksum = ip4_header_checksum (ip40);
 624
 625       if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 626         {
 627           map_ip6_map_ip6_reass_trace_t *tr =
 628             vlib_add_trace (vm, node, p0, sizeof (*tr));
 629           tr->offset = ip4_get_fragment_offset (ip40);
 630           tr->frag_len = clib_net_to_host_u16 (ip40->length) - sizeof (*ip40);
 631           tr->out = 1;
 632         }
 633
 634       vec_add1 (*fragments_ready, r->fragments[i].pi);
 635       r->fragments[i].pi = ~0;
 636       r->fragments[i].next_data_len = 0;
 637       r->fragments[i].next_data_offset = 0;
 638       map_main.ip6_reass_buffered_counter--;
 639
 640       //TODO: Best solution would be that ip6_map handles extension headers
 641       // and ignores atomic fragment. But in the meantime, let's just copy the header.
 642
 643       u8 protocol = frag0->next_hdr;
 644       memmove (u8_ptr_add (ip40, -sizeof (*ip60)), ip60, sizeof (*ip60));
 645       ((ip6_header_t *) u8_ptr_add (ip40, -sizeof (*ip60)))->protocol =
 646         protocol;
 647       vlib_buffer_advance (p0, sizeof (*frag0));
 648     }
 649 }
 650
 651 void
 652 map_ip6_drop_pi (u32 pi)
 653 {
 654   vlib_main_t *vm = vlib_get_main ();
 655   vlib_node_runtime_t *n =
 656     vlib_node_get_runtime (vm, ip6_map_ip6_reass_node.index);
 657   vlib_set_next_frame_buffer (vm, n, IP6_MAP_IP6_REASS_NEXT_DROP, pi);
 658 }
 659
 660 void
 661 map_ip4_drop_pi (u32 pi)
 662 {
 663   vlib_main_t *vm = vlib_get_main ();
 664   vlib_node_runtime_t *n =
 665     vlib_node_get_runtime (vm, ip6_map_ip4_reass_node.index);
 666   vlib_set_next_frame_buffer (vm, n, IP6_MAP_IP4_REASS_NEXT_DROP, pi);
 667 }
 668
 669 /*
 670  * ip6_reass
 671  * TODO: We should count the number of successfully
 672  * transmitted fragment bytes and compare that to the last fragment
 673  * offset such that we can free the reassembly structure when all fragments
 674  * have been forwarded.
 675  */
 676 static uword
 677 ip6_map_ip6_reass (vlib_main_t * vm,
 678                    vlib_node_runtime_t * node, vlib_frame_t * frame)
 679 {
 680   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 681   vlib_node_runtime_t *error_node =
 682     vlib_node_get_runtime (vm, ip6_map_ip6_reass_node.index);
 683   u32 *fragments_to_drop = NULL;
 684   u32 *fragments_ready = NULL;
 685
 686   from = vlib_frame_vector_args (frame);
 687   n_left_from = frame->n_vectors;
 688   next_index = node->cached_next_index;
 689   while (n_left_from > 0)
 690     {
 691       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 692
 693       /* Single loop */
 694       while (n_left_from > 0 && n_left_to_next > 0)
 695         {
 696           u32 pi0;
 697           vlib_buffer_t *p0;
 698           u8 error0 = MAP_ERROR_NONE;
 699           ip6_header_t *ip60;
 700           ip6_frag_hdr_t *frag0;
 701           u16 offset;
 702           u16 next_offset;
 703           u16 frag_len;
 704
 705           pi0 = to_next[0] = from[0];
 706           from += 1;
 707           n_left_from -= 1;
 708           to_next += 1;
 709           n_left_to_next -= 1;
 710
 711           p0 = vlib_get_buffer (vm, pi0);
 712           ip60 = vlib_buffer_get_current (p0);
 713           frag0 = (ip6_frag_hdr_t *) (ip60 + 1);
 714           offset =
 715             clib_host_to_net_u16 (frag0->fragment_offset_and_more) & (~7);
 716           frag_len =
 717             clib_net_to_host_u16 (ip60->payload_length) - sizeof (*frag0);
 718           next_offset =
 719             ip6_frag_hdr_more (frag0) ? (offset + frag_len) : (0xffff);
 720
 721           //FIXME: Support other extension headers, maybe
 722
 723           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 724             {
 725               map_ip6_map_ip6_reass_trace_t *tr =
 726                 vlib_add_trace (vm, node, p0, sizeof (*tr));
 727               tr->offset = offset;
 728               tr->frag_len = frag_len;
 729               tr->out = 0;
 730             }
 731
 732           map_ip6_reass_lock ();
 733           map_ip6_reass_t *r =
 734             map_ip6_reass_get (&ip60->src_address, &ip60->dst_address,
 735                                frag0->identification, frag0->next_hdr,
 736                                &fragments_to_drop);
 737           //FIXME: Use better error codes
 738           if (PREDICT_FALSE (!r))
 739             {
 740               // Could not create a caching entry
 741               error0 = MAP_ERROR_FRAGMENT_MEMORY;
 742             }
 743           else if (PREDICT_FALSE ((frag_len <= 20 &&
 744                                    (ip6_frag_hdr_more (frag0) || (!offset)))))
 745             {
 746               //Very small fragment are restricted to the last one and
 747               //can't be the first one
 748               error0 = MAP_ERROR_FRAGMENT_MALFORMED;
 749             }
 750           else
 751             if (map_ip6_reass_add_fragment
 752                 (r, pi0, offset, next_offset, (u8 *) (frag0 + 1), frag_len))
 753             {
 754               map_ip6_reass_free (r, &fragments_to_drop);
 755               error0 = MAP_ERROR_FRAGMENT_MEMORY;
 756             }
 757           else
 758             {
 759 #ifdef MAP_IP6_REASS_COUNT_BYTES
 760               if (!ip6_frag_hdr_more (frag0))
 761                 r->expected_total = offset + frag_len;
 762 #endif
 763               ip6_map_ip6_reass_prepare (vm, node, r, &fragments_ready,
 764                                          &fragments_to_drop);
 765 #ifdef MAP_IP6_REASS_COUNT_BYTES
 766               if (r->forwarded >= r->expected_total)
 767                 map_ip6_reass_free (r, &fragments_to_drop);
 768 #endif
 769             }
 770           map_ip6_reass_unlock ();
 771
 772           if (error0 == MAP_ERROR_NONE)
 773             {
 774               if (frag_len > 20)
 775                 {
 776                   //Dequeue the packet
 777                   n_left_to_next++;
 778                   to_next--;
 779                 }
 780               else
 781                 {
 782                   //All data from that packet was copied no need to keep it, but this is not an error
 783                   p0->error = error_node->errors[MAP_ERROR_NONE];
 784                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 785                                                    to_next, n_left_to_next,
 786                                                    pi0,
 787                                                    IP6_MAP_IP6_REASS_NEXT_DROP);
 788                 }
 789             }
 790           else
 791             {
 792               p0->error = error_node->errors[error0];
 793               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 794                                                n_left_to_next, pi0,
 795                                                IP6_MAP_IP6_REASS_NEXT_DROP);
 796             }
 797         }
 798       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 799     }
 800
 801   map_send_all_to_node (vm, fragments_ready, node,
 802                         &error_node->errors[MAP_ERROR_NONE],
 803                         IP6_MAP_IP6_REASS_NEXT_IP6_MAP);
 804   map_send_all_to_node (vm, fragments_to_drop, node,
 805                         &error_node->errors[MAP_ERROR_FRAGMENT_DROPPED],
 806                         IP6_MAP_IP6_REASS_NEXT_DROP);
 807
 808   vec_free (fragments_to_drop);
 809   vec_free (fragments_ready);
 810   return frame->n_vectors;
 811 }
 812
 813 /*
 814  * ip6_ip4_virt_reass
 815  */
 816 static uword
 817 ip6_map_ip4_reass (vlib_main_t * vm,
 818                    vlib_node_runtime_t * node, vlib_frame_t * frame)
 819 {
 820   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 821   vlib_node_runtime_t *error_node =
 822     vlib_node_get_runtime (vm, ip6_map_ip4_reass_node.index);
 823   map_main_t *mm = &map_main;
 824   vlib_combined_counter_main_t *cm = mm->domain_counters;
 825   u32 thread_index = vm->thread_index;
 826   u32 *fragments_to_drop = NULL;
 827   u32 *fragments_to_loopback = NULL;
 828
 829   from = vlib_frame_vector_args (frame);
 830   n_left_from = frame->n_vectors;
 831   next_index = node->cached_next_index;
 832   while (n_left_from > 0)
 833     {
 834       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 835
 836       /* Single loop */
 837       while (n_left_from > 0 && n_left_to_next > 0)
 838         {
 839           u32 pi0;
 840           vlib_buffer_t *p0;
 841           u8 error0 = MAP_ERROR_NONE;
 842           map_domain_t *d0;
 843           ip4_header_t *ip40;
 844           ip6_header_t *ip60;
 845           i32 port0 = 0;
 846           u32 map_domain_index0 = ~0;
 847           u32 next0 = IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP;
 848           u8 cached = 0;
 849
 850           pi0 = to_next[0] = from[0];
 851           from += 1;
 852           n_left_from -= 1;
 853           to_next += 1;
 854           n_left_to_next -= 1;
 855
 856           p0 = vlib_get_buffer (vm, pi0);
 857           ip40 = vlib_buffer_get_current (p0);
 858           ip60 = ((ip6_header_t *) ip40) - 1;
 859
 860           d0 =
 861             ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
 862                                 (ip4_address_t *) & ip40->src_address.as_u32,
 863                                 &map_domain_index0, &error0);
 864
 865           map_ip4_reass_lock ();
 866           //This node only deals with fragmented ip4
 867           map_ip4_reass_t *r = map_ip4_reass_get (ip40->src_address.as_u32,
 868                                                   ip40->dst_address.as_u32,
 869                                                   ip40->fragment_id,
 870                                                   ip40->protocol,
 871                                                   &fragments_to_drop);
 872           if (PREDICT_FALSE (!r))
 873             {
 874               // Could not create a caching entry
 875               error0 = MAP_ERROR_FRAGMENT_MEMORY;
 876             }
 877           else if (PREDICT_TRUE (ip4_get_fragment_offset (ip40)))
 878             {
 879               // This is a fragment
 880               if (r->port >= 0)
 881                 {
 882                   // We know the port already
 883                   port0 = r->port;
 884                 }
 885               else if (map_ip4_reass_add_fragment (r, pi0))
 886                 {
 887                   // Not enough space for caching
 888                   error0 = MAP_ERROR_FRAGMENT_MEMORY;
 889                   map_ip4_reass_free (r, &fragments_to_drop);
 890                 }
 891               else
 892                 {
 893                   cached = 1;
 894                 }
 895             }
 896           else if ((port0 = ip4_get_port (ip40, 1)) == 0)
 897             {
 898               // Could not find port from first fragment. Stop reassembling.
 899               error0 = MAP_ERROR_BAD_PROTOCOL;
 900               port0 = 0;
 901               map_ip4_reass_free (r, &fragments_to_drop);
 902             }
 903           else
 904             {
 905               // Found port. Remember it and loopback saved fragments
 906               r->port = port0;
 907               map_ip4_reass_get_fragments (r, &fragments_to_loopback);
 908             }
 909
 910 #ifdef MAP_IP4_REASS_COUNT_BYTES
 911           if (!cached && r)
 912             {
 913               r->forwarded += clib_host_to_net_u16 (ip40->length) - 20;
 914               if (!ip4_get_fragment_more (ip40))
 915                 r->expected_total =
 916                   ip4_get_fragment_offset (ip40) * 8 +
 917                   clib_host_to_net_u16 (ip40->length) - 20;
 918               if (r->forwarded >= r->expected_total)
 919                 map_ip4_reass_free (r, &fragments_to_drop);
 920             }
 921 #endif
 922
 923           map_ip4_reass_unlock ();
 924
 925           if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
 926             error0 =
 927               ip6_map_sec_check (d0, port0, ip40,
 928                                  ip60) ? MAP_ERROR_NONE :
 929               MAP_ERROR_DECAP_SEC_CHECK;
 930
 931           if (PREDICT_FALSE
 932               (d0->mtu && (clib_host_to_net_u16 (ip40->length) > d0->mtu)
 933                && error0 == MAP_ERROR_NONE && !cached))
 934             {
 935               vnet_buffer (p0)->ip_frag.flags = 0;
 936               vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
 937               vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
 938               next0 = IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT;
 939             }
 940
 941           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 942             {
 943               map_ip6_map_ip4_reass_trace_t *tr =
 944                 vlib_add_trace (vm, node, p0, sizeof (*tr));
 945               tr->map_domain_index = map_domain_index0;
 946               tr->port = port0;
 947               tr->cached = cached;
 948             }
 949
 950           if (cached)
 951             {
 952               //Dequeue the packet
 953               n_left_to_next++;
 954               to_next--;
 955             }
 956           else
 957             {
 958               if (error0 == MAP_ERROR_NONE)
 959                 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 960                                                  thread_index,
 961                                                  map_domain_index0, 1,
 962                                                  clib_net_to_host_u16
 963                                                  (ip40->length));
 964               next0 =
 965                 (error0 ==
 966                  MAP_ERROR_NONE) ? next0 : IP6_MAP_IP4_REASS_NEXT_DROP;
 967               p0->error = error_node->errors[error0];
 968               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 969                                                n_left_to_next, pi0, next0);
 970             }
 971
 972           //Loopback when we reach the end of the inpu vector
 973           if (n_left_from == 0 && vec_len (fragments_to_loopback))
 974             {
 975               from = vlib_frame_vector_args (frame);
 976               u32 len = vec_len (fragments_to_loopback);
 977               if (len <= VLIB_FRAME_SIZE)
 978                 {
 979                   clib_memcpy_fast (from, fragments_to_loopback,
 980                                     sizeof (u32) * len);
 981                   n_left_from = len;
 982                   vec_reset_length (fragments_to_loopback);
 983                 }
 984               else
 985                 {
 986                   clib_memcpy_fast (from, fragments_to_loopback +
 987                                     (len - VLIB_FRAME_SIZE),
 988                                     sizeof (u32) * VLIB_FRAME_SIZE);
 989                   n_left_from = VLIB_FRAME_SIZE;
 990                   _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
 991                 }
 992             }
 993         }
 994       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 995     }
 996   map_send_all_to_node (vm, fragments_to_drop, node,
 997                         &error_node->errors[MAP_ERROR_FRAGMENT_DROPPED],
 998                         IP6_MAP_IP4_REASS_NEXT_DROP);
 999
1000   vec_free (fragments_to_drop);
1001   vec_free (fragments_to_loopback);
1002   return frame->n_vectors;
1003 }
1004
1005 /*
1006  * ip6_icmp_relay
1007  */
1008 static uword
1009 ip6_map_icmp_relay (vlib_main_t * vm,
1010                     vlib_node_runtime_t * node, vlib_frame_t * frame)
1011 {
1012   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
1013   vlib_node_runtime_t *error_node =
1014     vlib_node_get_runtime (vm, ip6_map_icmp_relay_node.index);
1015   map_main_t *mm = &map_main;
1016   u32 thread_index = vm->thread_index;
1017   u16 *fragment_ids, *fid;
1018
1019   from = vlib_frame_vector_args (frame);
1020   n_left_from = frame->n_vectors;
1021   next_index = node->cached_next_index;
1022
1023   /* Get random fragment IDs for replies. */
1024   fid = fragment_ids =
1025     clib_random_buffer_get_data (&vm->random_buffer,
1026                                  n_left_from * sizeof (fragment_ids[0]));
1027
1028   while (n_left_from > 0)
1029     {
1030       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1031
1032       /* Single loop */
1033       while (n_left_from > 0 && n_left_to_next > 0)
1034         {
1035           u32 pi0;
1036           vlib_buffer_t *p0;
1037           u8 error0 = MAP_ERROR_NONE;
1038           ip6_header_t *ip60;
1039           u32 next0 = IP6_ICMP_RELAY_NEXT_IP4_LOOKUP;
1040           u32 mtu;
1041
1042           pi0 = to_next[0] = from[0];
1043           from += 1;
1044           n_left_from -= 1;
1045           to_next += 1;
1046           n_left_to_next -= 1;
1047
1048           p0 = vlib_get_buffer (vm, pi0);
1049           ip60 = vlib_buffer_get_current (p0);
1050           u16 tlen = clib_net_to_host_u16 (ip60->payload_length);
1051
1052           /*
1053            * In:
1054            *  IPv6 header           (40)
1055            *  ICMPv6 header          (8)
1056            *  IPv6 header           (40)
1057            *  Original IPv4 header / packet
1058            * Out:
1059            *  New IPv4 header
1060            *  New ICMP header
1061            *  Original IPv4 header / packet
1062            */
1063
1064           /* Need at least ICMP(8) + IPv6(40) + IPv4(20) + L4 header(8) */
1065           if (tlen < 76)
1066             {
1067               error0 = MAP_ERROR_ICMP_RELAY;
1068               goto error;
1069             }
1070
1071           icmp46_header_t *icmp60 = (icmp46_header_t *) (ip60 + 1);
1072           ip6_header_t *inner_ip60 = (ip6_header_t *) (icmp60 + 2);
1073
1074           if (inner_ip60->protocol != IP_PROTOCOL_IP_IN_IP)
1075             {
1076               error0 = MAP_ERROR_ICMP_RELAY;
1077               goto error;
1078             }
1079
1080           ip4_header_t *inner_ip40 = (ip4_header_t *) (inner_ip60 + 1);
1081           vlib_buffer_advance (p0, 60); /* sizeof ( IPv6 + ICMP + IPv6 - IPv4 - ICMP ) */
1082           ip4_header_t *new_ip40 = vlib_buffer_get_current (p0);
1083           icmp46_header_t *new_icmp40 = (icmp46_header_t *) (new_ip40 + 1);
1084
1085           /*
1086            * Relay according to RFC2473, section 8.3
1087            */
1088           switch (icmp60->type)
1089             {
1090             case ICMP6_destination_unreachable:
1091             case ICMP6_time_exceeded:
1092             case ICMP6_parameter_problem:
1093               /* Type 3 - destination unreachable, Code 1 - host unreachable */
1094               new_icmp40->type = ICMP4_destination_unreachable;
1095               new_icmp40->code =
1096                 ICMP4_destination_unreachable_destination_unreachable_host;
1097               break;
1098
1099             case ICMP6_packet_too_big:
1100               /* Type 3 - destination unreachable, Code 4 - packet too big */
1101               /* Potential TODO: Adjust domain tunnel MTU based on the value received here */
1102               mtu = clib_net_to_host_u32 (*((u32 *) (icmp60 + 1)));
1103
1104               /* Check DF flag */
1105               if (!
1106                   (inner_ip40->flags_and_fragment_offset &
1107                    clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT)))
1108                 {
1109                   error0 = MAP_ERROR_ICMP_RELAY;
1110                   goto error;
1111                 }
1112
1113               new_icmp40->type = ICMP4_destination_unreachable;
1114               new_icmp40->code =
1115                 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set;
1116               *((u32 *) (new_icmp40 + 1)) =
1117                 clib_host_to_net_u32 (mtu < 1280 ? 1280 : mtu);
1118               break;
1119
1120             default:
1121               error0 = MAP_ERROR_ICMP_RELAY;
1122               break;
1123             }
1124
1125           /*
1126            * Ensure the total ICMP packet is no longer than 576 bytes (RFC1812)
1127            */
1128           new_ip40->ip_version_and_header_length = 0x45;
1129           new_ip40->tos = 0;
1130           u16 nlen = (tlen - 20) > 576 ? 576 : tlen - 20;
1131           new_ip40->length = clib_host_to_net_u16 (nlen);
1132           new_ip40->fragment_id = fid[0];
1133           fid++;
1134           new_ip40->ttl = 64;
1135           new_ip40->protocol = IP_PROTOCOL_ICMP;
1136           new_ip40->src_address = mm->icmp4_src_address;
1137           new_ip40->dst_address = inner_ip40->src_address;
1138           new_ip40->checksum = ip4_header_checksum (new_ip40);
1139
1140           new_icmp40->checksum = 0;
1141           ip_csum_t sum = ip_incremental_checksum (0, new_icmp40, nlen - 20);
1142           new_icmp40->checksum = ~ip_csum_fold (sum);
1143
1144           vlib_increment_simple_counter (&mm->icmp_relayed, thread_index, 0,
1145                                          1);
1146
1147         error:
1148           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
1149             {
1150               map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
1151               tr->map_domain_index = 0;
1152               tr->port = 0;
1153             }
1154
1155           next0 =
1156             (error0 == MAP_ERROR_NONE) ? next0 : IP6_ICMP_RELAY_NEXT_DROP;
1157           p0->error = error_node->errors[error0];
1158           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1159                                            n_left_to_next, pi0, next0);
1160         }
1161       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1162     }
1163
1164   return frame->n_vectors;
1165
1166 }
1167
1168 static char *map_error_strings[] = {
1169 #define _(sym,string) string,
1170   foreach_map_error
1171 #undef _
1172 };
1173
1174 /* *INDENT-OFF* */
1175 VLIB_REGISTER_NODE(ip6_map_node) = {
1176   .function = ip6_map,
1177   .name = "ip6-map",
1178   .vector_size = sizeof(u32),
1179   .format_trace = format_map_trace,
1180   .type = VLIB_NODE_TYPE_INTERNAL,
1181
1182   .n_errors = MAP_N_ERROR,
1183   .error_strings = map_error_strings,
1184
1185   .n_next_nodes = IP6_MAP_N_NEXT,
1186   .next_nodes = {
1187     [IP6_MAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
1188 #ifdef MAP_SKIP_IP6_LOOKUP
1189     [IP6_MAP_NEXT_IP4_REWRITE] = "ip4-load-balance",
1190 #endif
1191     [IP6_MAP_NEXT_IP6_REASS] = "ip6-map-ip6-reass",
1192     [IP6_MAP_NEXT_IP4_REASS] = "ip6-map-ip4-reass",
1193     [IP6_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag",
1194     [IP6_MAP_NEXT_IP6_ICMP_RELAY] = "ip6-map-icmp-relay",
1195     [IP6_MAP_NEXT_IP6_LOCAL] = "ip6-local",
1196     [IP6_MAP_NEXT_DROP] = "error-drop",
1197     [IP6_MAP_NEXT_ICMP] = "ip6-icmp-error",
1198   },
1199 };
1200 /* *INDENT-ON* */
1201
1202 /* *INDENT-OFF* */
1203 VLIB_REGISTER_NODE(ip6_map_ip6_reass_node) = {
1204   .function = ip6_map_ip6_reass,
1205   .name = "ip6-map-ip6-reass",
1206   .vector_size = sizeof(u32),
1207   .format_trace = format_ip6_map_ip6_reass_trace,
1208   .type = VLIB_NODE_TYPE_INTERNAL,
1209   .n_errors = MAP_N_ERROR,
1210   .error_strings = map_error_strings,
1211   .n_next_nodes = IP6_MAP_IP6_REASS_N_NEXT,
1212   .next_nodes = {
1213     [IP6_MAP_IP6_REASS_NEXT_IP6_MAP] = "ip6-map",
1214     [IP6_MAP_IP6_REASS_NEXT_DROP] = "error-drop",
1215   },
1216 };
1217 /* *INDENT-ON* */
1218
1219 /* *INDENT-OFF* */
1220 VLIB_REGISTER_NODE(ip6_map_ip4_reass_node) = {
1221   .function = ip6_map_ip4_reass,
1222   .name = "ip6-map-ip4-reass",
1223   .vector_size = sizeof(u32),
1224   .format_trace = format_ip6_map_ip4_reass_trace,
1225   .type = VLIB_NODE_TYPE_INTERNAL,
1226   .n_errors = MAP_N_ERROR,
1227   .error_strings = map_error_strings,
1228   .n_next_nodes = IP6_MAP_IP4_REASS_N_NEXT,
1229   .next_nodes = {
1230     [IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP] = "ip4-lookup",
1231     [IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT] = "ip4-frag",
1232     [IP6_MAP_IP4_REASS_NEXT_DROP] = "error-drop",
1233   },
1234 };
1235 /* *INDENT-ON* */
1236
1237 /* *INDENT-OFF* */
1238 VLIB_REGISTER_NODE(ip6_map_icmp_relay_node, static) = {
1239   .function = ip6_map_icmp_relay,
1240   .name = "ip6-map-icmp-relay",
1241   .vector_size = sizeof(u32),
1242   .format_trace = format_map_trace, //FIXME
1243   .type = VLIB_NODE_TYPE_INTERNAL,
1244   .n_errors = MAP_N_ERROR,
1245   .error_strings = map_error_strings,
1246   .n_next_nodes = IP6_ICMP_RELAY_N_NEXT,
1247   .next_nodes = {
1248     [IP6_ICMP_RELAY_NEXT_IP4_LOOKUP] = "ip4-lookup",
1249     [IP6_ICMP_RELAY_NEXT_DROP] = "error-drop",
1250   },
1251 };
1252 /* *INDENT-ON* */
1253
1254 /*
1255  * fd.io coding-style-patch-verification: ON
1256  *
1257  * Local Variables:
1258  * eval: (c-set-style "gnu")
1259  * End:
1260  */