src/plugins/map/ip6_map_t.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/ip4_to_ip6.h>
  18 #include <vnet/ip/ip6_to_ip4.h>
  19 #include <vnet/ip/ip_frag.h>
  20
  21 typedef enum
  22 {
  23   IP6_MAPT_NEXT_MAPT_TCP_UDP,
  24   IP6_MAPT_NEXT_MAPT_ICMP,
  25   IP6_MAPT_NEXT_MAPT_FRAGMENTED,
  26   IP6_MAPT_NEXT_DROP,
  27   IP6_MAPT_N_NEXT
  28 } ip6_mapt_next_t;
  29
  30 typedef enum
  31 {
  32   IP6_MAPT_ICMP_NEXT_IP4_LOOKUP,
  33   IP6_MAPT_ICMP_NEXT_IP4_FRAG,
  34   IP6_MAPT_ICMP_NEXT_DROP,
  35   IP6_MAPT_ICMP_N_NEXT
  36 } ip6_mapt_icmp_next_t;
  37
  38 typedef enum
  39 {
  40   IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP,
  41   IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG,
  42   IP6_MAPT_TCP_UDP_NEXT_DROP,
  43   IP6_MAPT_TCP_UDP_N_NEXT
  44 } ip6_mapt_tcp_udp_next_t;
  45
  46 typedef enum
  47 {
  48   IP6_MAPT_FRAGMENTED_NEXT_IP4_LOOKUP,
  49   IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG,
  50   IP6_MAPT_FRAGMENTED_NEXT_DROP,
  51   IP6_MAPT_FRAGMENTED_N_NEXT
  52 } ip6_mapt_fragmented_next_t;
  53
  54 typedef struct
  55 {
  56   map_domain_t *d;
  57   u16 sender_port;
  58 } icmp6_to_icmp_ctx_t;
  59
  60 static int
  61 ip6_to_ip4_set_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
  62 {
  63   icmp6_to_icmp_ctx_t *ctx = arg;
  64   u32 ip4_sadr;
  65
  66   // Security check
  67   // Note that this prevents an intermediate IPv6 router from answering
  68   // the request.
  69   ip4_sadr = map_get_ip4 (&ip6->src_address, ctx->d->ip6_src_len);
  70   if (ip6->src_address.as_u64[0] !=
  71       map_get_pfx_net (ctx->d, ip4_sadr, ctx->sender_port)
  72       || ip6->src_address.as_u64[1] != map_get_sfx_net (ctx->d, ip4_sadr,
  73                                                         ctx->sender_port))
  74     return -1;
  75
  76   ip4->dst_address.as_u32 =
  77     ip6_map_t_embedded_address (ctx->d, &ip6->dst_address);
  78   ip4->src_address.as_u32 = ip4_sadr;
  79
  80   return 0;
  81 }
  82
  83 static int
  84 ip6_to_ip4_set_inner_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4,
  85                               void *arg)
  86 {
  87   icmp6_to_icmp_ctx_t *ctx = arg;
  88   u32 inner_ip4_dadr;
  89
  90   //Security check of inner packet
  91   inner_ip4_dadr = map_get_ip4 (&ip6->dst_address, ctx->d->ip6_src_len);
  92   if (ip6->dst_address.as_u64[0] !=
  93       map_get_pfx_net (ctx->d, inner_ip4_dadr, ctx->sender_port)
  94       || ip6->dst_address.as_u64[1] != map_get_sfx_net (ctx->d,
  95                                                         inner_ip4_dadr,
  96                                                         ctx->sender_port))
  97     return -1;
  98
  99   ip4->dst_address.as_u32 = inner_ip4_dadr;
 100   ip4->src_address.as_u32 =
 101     ip6_map_t_embedded_address (ctx->d, &ip6->src_address);
 102
 103   return 0;
 104 }
 105
 106 static uword
 107 ip6_map_t_icmp (vlib_main_t * vm,
 108                 vlib_node_runtime_t * node, vlib_frame_t * frame)
 109 {
 110   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 111   vlib_node_runtime_t *error_node =
 112     vlib_node_get_runtime (vm, ip6_map_t_icmp_node.index);
 113   from = vlib_frame_vector_args (frame);
 114   n_left_from = frame->n_vectors;
 115   next_index = node->cached_next_index;
 116   vlib_combined_counter_main_t *cm = map_main.domain_counters;
 117   u32 thread_index = vm->thread_index;
 118
 119   while (n_left_from > 0)
 120     {
 121       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 122
 123       while (n_left_from > 0 && n_left_to_next > 0)
 124         {
 125           u32 pi0;
 126           vlib_buffer_t *p0;
 127           u8 error0;
 128           ip6_mapt_icmp_next_t next0;
 129           map_domain_t *d0;
 130           u16 len0;
 131           icmp6_to_icmp_ctx_t ctx0;
 132           ip6_header_t *ip60;
 133
 134           pi0 = to_next[0] = from[0];
 135           from += 1;
 136           n_left_from -= 1;
 137           to_next += 1;
 138           n_left_to_next -= 1;
 139           error0 = MAP_ERROR_NONE;
 140           next0 = IP6_MAPT_ICMP_NEXT_IP4_LOOKUP;
 141
 142           p0 = vlib_get_buffer (vm, pi0);
 143           ip60 = vlib_buffer_get_current (p0);
 144           len0 = clib_net_to_host_u16 (ip60->payload_length);
 145           d0 =
 146             pool_elt_at_index (map_main.domains,
 147                                vnet_buffer (p0)->map_t.map_domain_index);
 148           ctx0.d = d0;
 149           ctx0.sender_port = 0;
 150           if (!ip6_get_port
 151               (vm, p0, ip60, p0->current_length, NULL, &ctx0.sender_port,
 152                NULL, NULL, NULL, NULL))
 153             {
 154               // In case of 1:1 mapping, we don't care about the port
 155               if (!(d0->ea_bits_len == 0 && d0->rules))
 156                 {
 157                   error0 = MAP_ERROR_ICMP;
 158                   goto err0;
 159                 }
 160             }
 161
 162           if (icmp6_to_icmp (vm, p0, ip6_to_ip4_set_icmp_cb, &ctx0,
 163                              ip6_to_ip4_set_inner_icmp_cb, &ctx0))
 164             {
 165               error0 = MAP_ERROR_ICMP;
 166               goto err0;
 167             }
 168
 169           if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 170             {
 171               // Send to fragmentation node if necessary
 172               vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 173               vnet_buffer (p0)->ip_frag.next_index = IP_FRAG_NEXT_IP4_LOOKUP;
 174               next0 = IP6_MAPT_ICMP_NEXT_IP4_FRAG;
 175             }
 176         err0:
 177           if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
 178             {
 179               vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 180                                                thread_index,
 181                                                vnet_buffer (p0)->
 182                                                map_t.map_domain_index, 1,
 183                                                len0);
 184             }
 185           else
 186             {
 187               next0 = IP6_MAPT_ICMP_NEXT_DROP;
 188             }
 189
 190           p0->error = error_node->errors[error0];
 191           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 192                                            to_next, n_left_to_next, pi0,
 193                                            next0);
 194         }
 195       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 196     }
 197   return frame->n_vectors;
 198 }
 199
 200 /*
 201  * Translate IPv6 fragmented packet to IPv4.
 202  */
 203 always_inline int
 204 map_ip6_to_ip4_fragmented (vlib_main_t * vm, vlib_buffer_t * p)
 205 {
 206   ip6_header_t *ip6;
 207   ip6_frag_hdr_t *frag;
 208   ip4_header_t *ip4;
 209   u16 frag_id;
 210   u8 frag_more;
 211   u16 frag_offset;
 212   u8 l4_protocol;
 213   u16 l4_offset;
 214
 215   ip6 = vlib_buffer_get_current (p);
 216
 217   if (ip6_parse
 218       (vm, p, ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
 219     return -1;
 220
 221   frag = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
 222   ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
 223   vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
 224
 225   frag_id = frag_id_6to4 (frag->identification);
 226   frag_more = ip6_frag_hdr_more (frag);
 227   frag_offset = ip6_frag_hdr_offset (frag);
 228
 229   ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr;
 230   ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr;
 231
 232   ip4->ip_version_and_header_length =
 233     IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
 234   ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label);
 235   ip4->length =
 236     u16_net_add (ip6->payload_length,
 237                  sizeof (*ip4) - l4_offset + sizeof (*ip6));
 238   ip4->fragment_id = frag_id;
 239   ip4->flags_and_fragment_offset =
 240     clib_host_to_net_u16 (frag_offset |
 241                           (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
 242   ip4->ttl = ip6->hop_limit;
 243   ip4->protocol =
 244     (l4_protocol == IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : l4_protocol;
 245   ip4->checksum = ip4_header_checksum (ip4);
 246
 247   return 0;
 248 }
 249
 250 static uword
 251 ip6_map_t_fragmented (vlib_main_t * vm,
 252                       vlib_node_runtime_t * node, vlib_frame_t * frame)
 253 {
 254   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 255   from = vlib_frame_vector_args (frame);
 256   n_left_from = frame->n_vectors;
 257   next_index = node->cached_next_index;
 258   vlib_node_runtime_t *error_node =
 259     vlib_node_get_runtime (vm, ip6_map_t_fragmented_node.index);
 260
 261   while (n_left_from > 0)
 262     {
 263       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 264
 265       while (n_left_from > 0 && n_left_to_next > 0)
 266         {
 267           u32 pi0;
 268           vlib_buffer_t *p0;
 269           u32 next0;
 270
 271           pi0 = to_next[0] = from[0];
 272           from += 1;
 273           n_left_from -= 1;
 274           to_next += 1;
 275           n_left_to_next -= 1;
 276
 277           next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
 278           p0 = vlib_get_buffer (vm, pi0);
 279
 280           if (map_ip6_to_ip4_fragmented (vm, p0))
 281             {
 282               p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
 283               next0 = IP6_MAPT_FRAGMENTED_NEXT_DROP;
 284             }
 285           else
 286             {
 287               if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 288                 {
 289                   // Send to fragmentation node if necessary
 290                   vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 291                   vnet_buffer (p0)->ip_frag.next_index =
 292                     IP_FRAG_NEXT_IP4_LOOKUP;
 293                   next0 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
 294                 }
 295             }
 296
 297           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 298                                            to_next, n_left_to_next, pi0,
 299                                            next0);
 300         }
 301       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 302     }
 303   return frame->n_vectors;
 304 }
 305
 306 /*
 307  * Translate IPv6 UDP/TCP packet to IPv4.
 308  * Returns 0 on success.
 309  * Returns a non-zero error code on error.
 310  */
 311 always_inline int
 312 map_ip6_to_ip4_tcp_udp (vlib_main_t * vm, vlib_buffer_t * p,
 313                         bool udp_checksum)
 314 {
 315   map_main_t *mm = &map_main;
 316   ip6_header_t *ip6;
 317   u16 *checksum;
 318   ip_csum_t csum = 0;
 319   ip4_header_t *ip4;
 320   u16 fragment_id;
 321   u16 flags;
 322   u16 frag_offset;
 323   u8 l4_protocol;
 324   u16 l4_offset;
 325   ip6_address_t old_src, old_dst;
 326
 327   ip6 = vlib_buffer_get_current (p);
 328
 329   if (ip6_parse
 330       (vm, p, ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
 331     return -1;
 332
 333   if (l4_protocol == IP_PROTOCOL_TCP)
 334     {
 335       tcp_header_t *tcp = ip6_next_header (ip6);
 336       if (mm->tcp_mss > 0)
 337         {
 338           csum = tcp->checksum;
 339           map_mss_clamping (tcp, &csum, mm->tcp_mss);
 340           tcp->checksum = ip_csum_fold (csum);
 341         }
 342       checksum = &tcp->checksum;
 343     }
 344   else
 345     {
 346       udp_header_t *udp = ip6_next_header (ip6);
 347       checksum = &udp->checksum;
 348     }
 349
 350   old_src.as_u64[0] = ip6->src_address.as_u64[0];
 351   old_src.as_u64[1] = ip6->src_address.as_u64[1];
 352   old_dst.as_u64[0] = ip6->dst_address.as_u64[0];
 353   old_dst.as_u64[1] = ip6->dst_address.as_u64[1];
 354
 355   ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
 356
 357   vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
 358
 359   if (PREDICT_FALSE (frag_offset))
 360     {
 361       // Only the first fragment
 362       ip6_frag_hdr_t *hdr = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
 363       fragment_id = frag_id_6to4 (hdr->identification);
 364       flags = clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
 365     }
 366   else
 367     {
 368       fragment_id = 0;
 369       flags = 0;
 370     }
 371
 372   ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr;
 373   ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr;
 374
 375   /*
 376    * Drop spoofed packets that from a known domain source.
 377    */
 378   u32 map_domain_index = -1;
 379   u8 error = 0;
 380
 381   ip4_map_get_domain (&ip4->src_address, &map_domain_index, &error);
 382   if (error)
 383     return error;
 384
 385   ip4->ip_version_and_header_length =
 386     IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
 387   ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label);
 388   ip4->length =
 389     u16_net_add (ip6->payload_length,
 390                  sizeof (*ip4) + sizeof (*ip6) - l4_offset);
 391   ip4->fragment_id = fragment_id;
 392   ip4->flags_and_fragment_offset = flags;
 393   ip4->ttl = ip6->hop_limit;
 394   ip4->protocol = l4_protocol;
 395   ip4->checksum = ip4_header_checksum (ip4);
 396
 397   // UDP checksum is optional over IPv4
 398   if (!udp_checksum && l4_protocol == IP_PROTOCOL_UDP)
 399     {
 400       *checksum = 0;
 401     }
 402   else
 403     {
 404       csum = ip_csum_sub_even (*checksum, old_src.as_u64[0]);
 405       csum = ip_csum_sub_even (csum, old_src.as_u64[1]);
 406       csum = ip_csum_sub_even (csum, old_dst.as_u64[0]);
 407       csum = ip_csum_sub_even (csum, old_dst.as_u64[1]);
 408       csum = ip_csum_add_even (csum, ip4->dst_address.as_u32);
 409       csum = ip_csum_add_even (csum, ip4->src_address.as_u32);
 410       *checksum = ip_csum_fold (csum);
 411     }
 412
 413   return 0;
 414 }
 415
 416 static uword
 417 ip6_map_t_tcp_udp (vlib_main_t * vm,
 418                    vlib_node_runtime_t * node, vlib_frame_t * frame)
 419 {
 420   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 421   vlib_node_runtime_t *error_node =
 422     vlib_node_get_runtime (vm, ip6_map_t_tcp_udp_node.index);
 423
 424   from = vlib_frame_vector_args (frame);
 425   n_left_from = frame->n_vectors;
 426   next_index = node->cached_next_index;
 427   while (n_left_from > 0)
 428     {
 429       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 430
 431       while (n_left_from > 0 && n_left_to_next > 0)
 432         {
 433           u32 pi0;
 434           vlib_buffer_t *p0;
 435           ip6_mapt_tcp_udp_next_t next0;
 436
 437           pi0 = to_next[0] = from[0];
 438           from += 1;
 439           n_left_from -= 1;
 440           to_next += 1;
 441           n_left_to_next -= 1;
 442           next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
 443
 444           p0 = vlib_get_buffer (vm, pi0);
 445
 446           if (map_ip6_to_ip4_tcp_udp (vm, p0, true))
 447             {
 448               p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
 449               next0 = IP6_MAPT_TCP_UDP_NEXT_DROP;
 450             }
 451           else
 452             {
 453               if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 454                 {
 455                   // Send to fragmentation node if necessary
 456                   vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 457                   vnet_buffer (p0)->ip_frag.next_index =
 458                     IP_FRAG_NEXT_IP4_LOOKUP;
 459                   next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
 460                 }
 461             }
 462
 463           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 464                                            to_next, n_left_to_next, pi0,
 465                                            next0);
 466         }
 467       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 468     }
 469   return frame->n_vectors;
 470 }
 471
 472 static uword
 473 ip6_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 474 {
 475   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 476   vlib_node_runtime_t *error_node =
 477     vlib_node_get_runtime (vm, ip6_map_t_node.index);
 478   vlib_combined_counter_main_t *cm = map_main.domain_counters;
 479   u32 thread_index = vm->thread_index;
 480
 481   from = vlib_frame_vector_args (frame);
 482   n_left_from = frame->n_vectors;
 483   next_index = node->cached_next_index;
 484   while (n_left_from > 0)
 485     {
 486       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 487
 488       while (n_left_from > 0 && n_left_to_next > 0)
 489         {
 490           u32 pi0;
 491           vlib_buffer_t *p0;
 492           ip6_header_t *ip60;
 493           u8 error0;
 494           u32 l4_len0;
 495           i32 map_port0;
 496           map_domain_t *d0;
 497           ip6_frag_hdr_t *frag0;
 498           ip6_mapt_next_t next0 = 0;
 499           u32 saddr;
 500
 501           pi0 = to_next[0] = from[0];
 502           from += 1;
 503           n_left_from -= 1;
 504           to_next += 1;
 505           n_left_to_next -= 1;
 506           error0 = MAP_ERROR_NONE;
 507           p0 = vlib_get_buffer (vm, pi0);
 508           u16 l4_src_port = vnet_buffer (p0)->ip.reass.l4_src_port;
 509
 510           ip60 = vlib_buffer_get_current (p0);
 511
 512           d0 =
 513             ip6_map_get_domain (&ip60->dst_address,
 514                                 &vnet_buffer (p0)->map_t.map_domain_index,
 515                                 &error0);
 516           if (!d0)
 517             {                   /* Guess it wasn't for us */
 518               vnet_feature_next (&next0, p0);
 519               goto exit;
 520             }
 521
 522           saddr = map_get_ip4 (&ip60->src_address, d0->ip6_src_len);
 523           vnet_buffer (p0)->map_t.v6.saddr = saddr;
 524           vnet_buffer (p0)->map_t.v6.daddr =
 525             ip6_map_t_embedded_address (d0, &ip60->dst_address);
 526           vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
 527
 528           if (PREDICT_FALSE
 529               (ip6_parse (vm, p0, ip60, p0->current_length,
 530                           &(vnet_buffer (p0)->map_t.v6.l4_protocol),
 531                           &(vnet_buffer (p0)->map_t.v6.l4_offset),
 532                           &(vnet_buffer (p0)->map_t.v6.frag_offset))))
 533             {
 534               error0 =
 535                 error0 == MAP_ERROR_NONE ? MAP_ERROR_MALFORMED : error0;
 536             }
 537
 538           map_port0 = -1;
 539           l4_len0 =
 540             (u32) clib_net_to_host_u16 (ip60->payload_length) +
 541             sizeof (*ip60) - vnet_buffer (p0)->map_t.v6.l4_offset;
 542           frag0 =
 543             (ip6_frag_hdr_t *) u8_ptr_add (ip60,
 544                                            vnet_buffer (p0)->map_t.v6.
 545                                            frag_offset);
 546
 547           if (PREDICT_FALSE
 548               (vnet_buffer (p0)->map_t.v6.frag_offset
 549                && ip6_frag_hdr_offset (frag0)))
 550             {
 551               map_port0 = l4_src_port;
 552               next0 = IP6_MAPT_NEXT_MAPT_FRAGMENTED;
 553             }
 554           else
 555             if (PREDICT_TRUE
 556                 (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_TCP))
 557             {
 558               error0 =
 559                 l4_len0 <
 560                 sizeof (tcp_header_t) ? MAP_ERROR_MALFORMED : error0;
 561               vnet_buffer (p0)->map_t.checksum_offset =
 562                 vnet_buffer (p0)->map_t.v6.l4_offset + 16;
 563               next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
 564               map_port0 = l4_src_port;
 565             }
 566           else
 567             if (PREDICT_TRUE
 568                 (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_UDP))
 569             {
 570               error0 =
 571                 l4_len0 <
 572                 sizeof (udp_header_t) ? MAP_ERROR_MALFORMED : error0;
 573               vnet_buffer (p0)->map_t.checksum_offset =
 574                 vnet_buffer (p0)->map_t.v6.l4_offset + 6;
 575               next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
 576               map_port0 = l4_src_port;
 577             }
 578           else if (vnet_buffer (p0)->map_t.v6.l4_protocol ==
 579                    IP_PROTOCOL_ICMP6)
 580             {
 581               error0 =
 582                 l4_len0 <
 583                 sizeof (icmp46_header_t) ? MAP_ERROR_MALFORMED : error0;
 584               next0 = IP6_MAPT_NEXT_MAPT_ICMP;
 585               if (((icmp46_header_t *)
 586                    u8_ptr_add (ip60,
 587                                vnet_buffer (p0)->map_t.v6.l4_offset))->code ==
 588                   ICMP6_echo_reply
 589                   || ((icmp46_header_t *)
 590                       u8_ptr_add (ip60,
 591                                   vnet_buffer (p0)->map_t.v6.l4_offset))->
 592                   code == ICMP6_echo_request)
 593                 map_port0 = l4_src_port;
 594             }
 595           else
 596             {
 597               // TODO: In case of 1:1 mapping, it might be possible to
 598               // do something with those packets.
 599               error0 = MAP_ERROR_BAD_PROTOCOL;
 600             }
 601
 602           if (PREDICT_FALSE (map_port0 != -1) &&
 603               (ip60->src_address.as_u64[0] !=
 604                map_get_pfx_net (d0, vnet_buffer (p0)->map_t.v6.saddr,
 605                                 map_port0)
 606                || ip60->src_address.as_u64[1] != map_get_sfx_net (d0,
 607                                                                   vnet_buffer
 608                                                                   (p0)->map_t.
 609                                                                   v6.saddr,
 610                                                                   map_port0)))
 611             {
 612               // Security check when map_port0 is not zero (non-first
 613               // fragment, UDP or TCP)
 614               error0 =
 615                 error0 == MAP_ERROR_NONE ? MAP_ERROR_SEC_CHECK : error0;
 616             }
 617
 618           if (PREDICT_TRUE
 619               (error0 == MAP_ERROR_NONE && next0 != IP6_MAPT_NEXT_MAPT_ICMP))
 620             {
 621               vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 622                                                thread_index,
 623                                                vnet_buffer (p0)->map_t.
 624                                                map_domain_index, 1,
 625                                                clib_net_to_host_u16 (ip60->
 626                                                                      payload_length));
 627             }
 628
 629           next0 = (error0 != MAP_ERROR_NONE) ? IP6_MAPT_NEXT_DROP : next0;
 630           p0->error = error_node->errors[error0];
 631           if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
 632             {
 633               map_add_trace (vm, node, p0,
 634                              vnet_buffer (p0)->map_t.map_domain_index,
 635                              map_port0);
 636             }
 637         exit:
 638           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 639                                            to_next, n_left_to_next, pi0,
 640                                            next0);
 641         }
 642       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 643     }
 644   return frame->n_vectors;
 645 }
 646
 647 static char *map_t_error_strings[] = {
 648 #define _(sym, string) string,
 649   foreach_map_error
 650 #undef _
 651 };
 652
 653 /* *INDENT-OFF* */
 654 VLIB_REGISTER_NODE(ip6_map_t_fragmented_node) = {
 655   .function = ip6_map_t_fragmented,
 656   .name = "ip6-map-t-fragmented",
 657   .vector_size = sizeof (u32),
 658   .format_trace = format_map_trace,
 659   .type = VLIB_NODE_TYPE_INTERNAL,
 660
 661   .n_errors = MAP_N_ERROR,
 662   .error_strings = map_t_error_strings,
 663
 664   .n_next_nodes = IP6_MAPT_FRAGMENTED_N_NEXT,
 665   .next_nodes =
 666   {
 667     [IP6_MAPT_FRAGMENTED_NEXT_IP4_LOOKUP] = "ip4-lookup",
 668     [IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 669     [IP6_MAPT_FRAGMENTED_NEXT_DROP] = "error-drop",
 670   },
 671 };
 672 /* *INDENT-ON* */
 673
 674 /* *INDENT-OFF* */
 675 VLIB_REGISTER_NODE(ip6_map_t_icmp_node) = {
 676   .function = ip6_map_t_icmp,
 677   .name = "ip6-map-t-icmp",
 678   .vector_size = sizeof (u32),
 679   .format_trace = format_map_trace,
 680   .type = VLIB_NODE_TYPE_INTERNAL,
 681
 682   .n_errors = MAP_N_ERROR,
 683   .error_strings = map_t_error_strings,
 684
 685   .n_next_nodes = IP6_MAPT_ICMP_N_NEXT,
 686   .next_nodes =
 687   {
 688     [IP6_MAPT_ICMP_NEXT_IP4_LOOKUP] = "ip4-lookup",
 689     [IP6_MAPT_ICMP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 690     [IP6_MAPT_ICMP_NEXT_DROP] = "error-drop",
 691   },
 692 };
 693 /* *INDENT-ON* */
 694
 695 /* *INDENT-OFF* */
 696 VLIB_REGISTER_NODE(ip6_map_t_tcp_udp_node) = {
 697   .function = ip6_map_t_tcp_udp,
 698   .name = "ip6-map-t-tcp-udp",
 699   .vector_size = sizeof (u32),
 700   .format_trace = format_map_trace,
 701   .type = VLIB_NODE_TYPE_INTERNAL,
 702
 703   .n_errors = MAP_N_ERROR,
 704   .error_strings = map_t_error_strings,
 705
 706   .n_next_nodes = IP6_MAPT_TCP_UDP_N_NEXT,
 707   .next_nodes =
 708   {
 709     [IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP] = "ip4-lookup",
 710     [IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 711     [IP6_MAPT_TCP_UDP_NEXT_DROP] = "error-drop",
 712   },
 713 };
 714 /* *INDENT-ON* */
 715
 716 /* *INDENT-OFF* */
 717 VNET_FEATURE_INIT (ip6_map_t_feature, static) = {
 718     .arc_name = "ip6-unicast",
 719     .node_name = "ip6-map-t",
 720     .runs_before = VNET_FEATURES ("ip6-flow-classify"),
 721     .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
 722 };
 723
 724 VLIB_REGISTER_NODE(ip6_map_t_node) = {
 725   .function = ip6_map_t,
 726   .name = "ip6-map-t",
 727   .vector_size = sizeof(u32),
 728   .format_trace = format_map_trace,
 729   .type = VLIB_NODE_TYPE_INTERNAL,
 730
 731   .n_errors = MAP_N_ERROR,
 732   .error_strings = map_t_error_strings,
 733
 734   .n_next_nodes = IP6_MAPT_N_NEXT,
 735   .next_nodes =
 736   {
 737     [IP6_MAPT_NEXT_MAPT_TCP_UDP] = "ip6-map-t-tcp-udp",
 738     [IP6_MAPT_NEXT_MAPT_ICMP] = "ip6-map-t-icmp",
 739     [IP6_MAPT_NEXT_MAPT_FRAGMENTED] = "ip6-map-t-fragmented",
 740     [IP6_MAPT_NEXT_DROP] = "error-drop",
 741   },
 742 };
 743 /* *INDENT-ON* */
 744
 745 /*
 746  * fd.io coding-style-patch-verification: ON
 747  *
 748  * Local Variables:
 749  * eval: (c-set-style "gnu")
 750  * End:
 751  */