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