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 static_always_inline int
  55 ip6_map_fragment_cache (ip6_header_t * ip6, ip6_frag_hdr_t * frag,
  56                         map_domain_t * d, u16 port)
  57 {
  58   u32 *ignore = NULL;
  59   map_ip4_reass_lock ();
  60   map_ip4_reass_t *r =
  61     map_ip4_reass_get (map_get_ip4 (&ip6->src_address, d->ip6_src_len),
  62                        ip6_map_t_embedded_address (d, &ip6->dst_address),
  63                        frag_id_6to4 (frag->identification),
  64                        (ip6->protocol ==
  65                         IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : ip6->protocol,
  66                        &ignore);
  67   if (r)
  68     r->port = port;
  69
  70   map_ip4_reass_unlock ();
  71   return !r;
  72 }
  73
  74 /* Returns the associated port or -1 */
  75 static_always_inline i32
  76 ip6_map_fragment_get (ip6_header_t * ip6, ip6_frag_hdr_t * frag,
  77                       map_domain_t * d)
  78 {
  79   u32 *ignore = NULL;
  80   map_ip4_reass_lock ();
  81   map_ip4_reass_t *r =
  82     map_ip4_reass_get (map_get_ip4 (&ip6->src_address, d->ip6_src_len),
  83                        ip6_map_t_embedded_address (d, &ip6->dst_address),
  84                        frag_id_6to4 (frag->identification),
  85                        (ip6->protocol ==
  86                         IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : ip6->protocol,
  87                        &ignore);
  88   i32 ret = r ? r->port : -1;
  89   map_ip4_reass_unlock ();
  90   return ret;
  91 }
  92
  93 typedef struct
  94 {
  95   map_domain_t *d;
  96   u16 sender_port;
  97 } icmp6_to_icmp_ctx_t;
  98
  99 static int
 100 ip6_to_ip4_set_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
 101 {
 102   icmp6_to_icmp_ctx_t *ctx = arg;
 103   u32 ip4_sadr;
 104
 105   // Security check
 106   // Note that this prevents an intermediate IPv6 router from answering
 107   // the request.
 108   ip4_sadr = map_get_ip4 (&ip6->src_address, ctx->d->flags);
 109   if (ip6->src_address.as_u64[0] !=
 110       map_get_pfx_net (ctx->d, ip4_sadr, ctx->sender_port)
 111       || ip6->src_address.as_u64[1] != map_get_sfx_net (ctx->d, ip4_sadr,
 112                                                         ctx->sender_port))
 113     return -1;
 114
 115   ip4->dst_address.as_u32 =
 116     ip6_map_t_embedded_address (ctx->d, &ip6->dst_address);
 117   ip4->src_address.as_u32 = ip4_sadr;
 118
 119   return 0;
 120 }
 121
 122 static int
 123 ip6_to_ip4_set_inner_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4,
 124                               void *arg)
 125 {
 126   icmp6_to_icmp_ctx_t *ctx = arg;
 127   u32 inner_ip4_dadr;
 128
 129   //Security check of inner packet
 130   inner_ip4_dadr = map_get_ip4 (&ip6->dst_address, ctx->d->flags);
 131   if (ip6->dst_address.as_u64[0] !=
 132       map_get_pfx_net (ctx->d, inner_ip4_dadr, ctx->sender_port)
 133       || ip6->dst_address.as_u64[1] != map_get_sfx_net (ctx->d,
 134                                                         inner_ip4_dadr,
 135                                                         ctx->sender_port))
 136     return -1;
 137
 138   ip4->dst_address.as_u32 = inner_ip4_dadr;
 139   ip4->src_address.as_u32 =
 140     ip6_map_t_embedded_address (ctx->d, &ip6->src_address);
 141
 142   return 0;
 143 }
 144
 145 static uword
 146 ip6_map_t_icmp (vlib_main_t * vm,
 147                 vlib_node_runtime_t * node, vlib_frame_t * frame)
 148 {
 149   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 150   vlib_node_runtime_t *error_node =
 151     vlib_node_get_runtime (vm, ip6_map_t_icmp_node.index);
 152   from = vlib_frame_vector_args (frame);
 153   n_left_from = frame->n_vectors;
 154   next_index = node->cached_next_index;
 155   vlib_combined_counter_main_t *cm = map_main.domain_counters;
 156   u32 thread_index = vm->thread_index;
 157
 158   while (n_left_from > 0)
 159     {
 160       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 161
 162       while (n_left_from > 0 && n_left_to_next > 0)
 163         {
 164           u32 pi0;
 165           vlib_buffer_t *p0;
 166           u8 error0;
 167           ip6_mapt_icmp_next_t next0;
 168           map_domain_t *d0;
 169           u16 len0;
 170           icmp6_to_icmp_ctx_t ctx0;
 171           ip6_header_t *ip60;
 172
 173           pi0 = to_next[0] = from[0];
 174           from += 1;
 175           n_left_from -= 1;
 176           to_next += 1;
 177           n_left_to_next -= 1;
 178           error0 = MAP_ERROR_NONE;
 179           next0 = IP6_MAPT_ICMP_NEXT_IP4_LOOKUP;
 180
 181           p0 = vlib_get_buffer (vm, pi0);
 182           ip60 = vlib_buffer_get_current (p0);
 183           len0 = clib_net_to_host_u16 (ip60->payload_length);
 184           d0 =
 185             pool_elt_at_index (map_main.domains,
 186                                vnet_buffer (p0)->map_t.map_domain_index);
 187           ctx0.sender_port = ip6_get_port (ip60, 0, p0->current_length);
 188           ctx0.d = d0;
 189           if (ctx0.sender_port == 0)
 190             {
 191               // In case of 1:1 mapping, we don't care about the port
 192               if (!(d0->ea_bits_len == 0 && d0->rules))
 193                 {
 194                   error0 = MAP_ERROR_ICMP;
 195                   goto err0;
 196                 }
 197             }
 198
 199           if (icmp6_to_icmp
 200               (p0, ip6_to_ip4_set_icmp_cb, &ctx0,
 201                ip6_to_ip4_set_inner_icmp_cb, &ctx0))
 202             {
 203               error0 = MAP_ERROR_ICMP;
 204               goto err0;
 205             }
 206
 207           if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 208             {
 209               // Send to fragmentation node if necessary
 210               vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 211               vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
 212               next0 = IP6_MAPT_ICMP_NEXT_IP4_FRAG;
 213             }
 214         err0:
 215           if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
 216             {
 217               vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 218                                                thread_index,
 219                                                vnet_buffer (p0)->
 220                                                map_t.map_domain_index, 1,
 221                                                len0);
 222             }
 223           else
 224             {
 225               next0 = IP6_MAPT_ICMP_NEXT_DROP;
 226             }
 227
 228           p0->error = error_node->errors[error0];
 229           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 230                                            to_next, n_left_to_next, pi0,
 231                                            next0);
 232         }
 233       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 234     }
 235   return frame->n_vectors;
 236 }
 237
 238 /*
 239  * Translate IPv6 fragmented packet to IPv4.
 240  */
 241 always_inline int
 242 map_ip6_to_ip4_fragmented (vlib_buffer_t * p)
 243 {
 244   ip6_header_t *ip6;
 245   ip6_frag_hdr_t *frag;
 246   ip4_header_t *ip4;
 247   u16 frag_id;
 248   u8 frag_more;
 249   u16 frag_offset;
 250   u8 l4_protocol;
 251   u16 l4_offset;
 252
 253   ip6 = vlib_buffer_get_current (p);
 254
 255   if (ip6_parse
 256       (ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
 257     return -1;
 258
 259   frag = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
 260   ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
 261   vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
 262
 263   frag_id = frag_id_6to4 (frag->identification);
 264   frag_more = ip6_frag_hdr_more (frag);
 265   frag_offset = ip6_frag_hdr_offset (frag);
 266
 267   ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr;
 268   ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr;
 269
 270   ip4->ip_version_and_header_length =
 271     IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
 272   ip4->tos = ip6_translate_tos (ip6);
 273   ip4->length =
 274     u16_net_add (ip6->payload_length,
 275                  sizeof (*ip4) - l4_offset + sizeof (*ip6));
 276   ip4->fragment_id = frag_id;
 277   ip4->flags_and_fragment_offset =
 278     clib_host_to_net_u16 (frag_offset |
 279                           (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
 280   ip4->ttl = ip6->hop_limit;
 281   ip4->protocol =
 282     (l4_protocol == IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : l4_protocol;
 283   ip4->checksum = ip4_header_checksum (ip4);
 284
 285   return 0;
 286 }
 287
 288 static uword
 289 ip6_map_t_fragmented (vlib_main_t * vm,
 290                       vlib_node_runtime_t * node, vlib_frame_t * frame)
 291 {
 292   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 293   from = vlib_frame_vector_args (frame);
 294   n_left_from = frame->n_vectors;
 295   next_index = node->cached_next_index;
 296   vlib_node_runtime_t *error_node =
 297     vlib_node_get_runtime (vm, ip6_map_t_fragmented_node.index);
 298
 299   while (n_left_from > 0)
 300     {
 301       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 302
 303       while (n_left_from > 0 && n_left_to_next > 0)
 304         {
 305           u32 pi0;
 306           vlib_buffer_t *p0;
 307           u32 next0;
 308
 309           pi0 = to_next[0] = from[0];
 310           from += 1;
 311           n_left_from -= 1;
 312           to_next += 1;
 313           n_left_to_next -= 1;
 314
 315           next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
 316           p0 = vlib_get_buffer (vm, pi0);
 317
 318           if (map_ip6_to_ip4_fragmented (p0))
 319             {
 320               p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
 321               next0 = IP6_MAPT_FRAGMENTED_NEXT_DROP;
 322             }
 323           else
 324             {
 325               if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 326                 {
 327                   // Send to fragmentation node if necessary
 328                   vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 329                   vnet_buffer (p0)->ip_frag.next_index =
 330                     IP4_FRAG_NEXT_IP4_LOOKUP;
 331                   next0 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
 332                 }
 333             }
 334
 335           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 336                                            to_next, n_left_to_next, pi0,
 337                                            next0);
 338         }
 339       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 340     }
 341   return frame->n_vectors;
 342 }
 343
 344 /*
 345  * Translate IPv6 UDP/TCP packet to IPv4.
 346  */
 347 always_inline int
 348 map_ip6_to_ip4_tcp_udp (vlib_buffer_t * p, bool udp_checksum)
 349 {
 350   map_main_t *mm = &map_main;
 351   ip6_header_t *ip6;
 352   u16 *checksum;
 353   ip_csum_t csum = 0;
 354   ip4_header_t *ip4;
 355   u16 fragment_id;
 356   u16 flags;
 357   u16 frag_offset;
 358   u8 l4_protocol;
 359   u16 l4_offset;
 360   ip6_address_t old_src, old_dst;
 361
 362   ip6 = vlib_buffer_get_current (p);
 363
 364   if (ip6_parse
 365       (ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
 366     return -1;
 367
 368   if (l4_protocol == IP_PROTOCOL_TCP)
 369     {
 370       tcp_header_t *tcp = ip6_next_header (ip6);
 371       if (mm->tcp_mss > 0)
 372         {
 373           csum = tcp->checksum;
 374           map_mss_clamping (tcp, &csum, mm->tcp_mss);
 375           tcp->checksum = ip_csum_fold (csum);
 376         }
 377       checksum = &tcp->checksum;
 378     }
 379   else
 380     {
 381       udp_header_t *udp = ip6_next_header (ip6);
 382       checksum = &udp->checksum;
 383     }
 384
 385   old_src.as_u64[0] = ip6->src_address.as_u64[0];
 386   old_src.as_u64[1] = ip6->src_address.as_u64[1];
 387   old_dst.as_u64[0] = ip6->dst_address.as_u64[0];
 388   old_dst.as_u64[1] = ip6->dst_address.as_u64[1];
 389
 390   ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
 391
 392   vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
 393
 394   if (PREDICT_FALSE (frag_offset))
 395     {
 396       // Only the first fragment
 397       ip6_frag_hdr_t *hdr = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
 398       fragment_id = frag_id_6to4 (hdr->identification);
 399       flags = clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
 400     }
 401   else
 402     {
 403       fragment_id = 0;
 404       flags = 0;
 405     }
 406
 407   ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr;
 408   ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr;
 409
 410   ip4->ip_version_and_header_length =
 411     IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
 412   ip4->tos = ip6_translate_tos (ip6);
 413   ip4->length =
 414     u16_net_add (ip6->payload_length,
 415                  sizeof (*ip4) + sizeof (*ip6) - l4_offset);
 416   ip4->fragment_id = fragment_id;
 417   ip4->flags_and_fragment_offset = flags;
 418   ip4->ttl = ip6->hop_limit;
 419   ip4->protocol = l4_protocol;
 420   ip4->checksum = ip4_header_checksum (ip4);
 421
 422   // UDP checksum is optional over IPv4
 423   if (!udp_checksum && l4_protocol == IP_PROTOCOL_UDP)
 424     {
 425       *checksum = 0;
 426     }
 427   else
 428     {
 429       csum = ip_csum_sub_even (*checksum, old_src.as_u64[0]);
 430       csum = ip_csum_sub_even (csum, old_src.as_u64[1]);
 431       csum = ip_csum_sub_even (csum, old_dst.as_u64[0]);
 432       csum = ip_csum_sub_even (csum, old_dst.as_u64[1]);
 433       csum = ip_csum_add_even (csum, ip4->dst_address.as_u32);
 434       csum = ip_csum_add_even (csum, ip4->src_address.as_u32);
 435       *checksum = ip_csum_fold (csum);
 436     }
 437
 438   return 0;
 439 }
 440
 441 static uword
 442 ip6_map_t_tcp_udp (vlib_main_t * vm,
 443                    vlib_node_runtime_t * node, vlib_frame_t * frame)
 444 {
 445   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 446   vlib_node_runtime_t *error_node =
 447     vlib_node_get_runtime (vm, ip6_map_t_tcp_udp_node.index);
 448
 449   from = vlib_frame_vector_args (frame);
 450   n_left_from = frame->n_vectors;
 451   next_index = node->cached_next_index;
 452   while (n_left_from > 0)
 453     {
 454       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 455
 456       while (n_left_from > 0 && n_left_to_next > 0)
 457         {
 458           u32 pi0;
 459           vlib_buffer_t *p0;
 460           ip6_mapt_tcp_udp_next_t next0;
 461
 462           pi0 = to_next[0] = from[0];
 463           from += 1;
 464           n_left_from -= 1;
 465           to_next += 1;
 466           n_left_to_next -= 1;
 467           next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
 468
 469           p0 = vlib_get_buffer (vm, pi0);
 470
 471           if (map_ip6_to_ip4_tcp_udp (p0, true))
 472             {
 473               p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
 474               next0 = IP6_MAPT_TCP_UDP_NEXT_DROP;
 475             }
 476           else
 477             {
 478               if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
 479                 {
 480                   // Send to fragmentation node if necessary
 481                   vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
 482                   vnet_buffer (p0)->ip_frag.next_index =
 483                     IP4_FRAG_NEXT_IP4_LOOKUP;
 484                   next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
 485                 }
 486             }
 487
 488           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 489                                            to_next, n_left_to_next, pi0,
 490                                            next0);
 491         }
 492       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 493     }
 494   return frame->n_vectors;
 495 }
 496
 497 static uword
 498 ip6_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 499 {
 500   u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
 501   vlib_node_runtime_t *error_node =
 502     vlib_node_get_runtime (vm, ip6_map_t_node.index);
 503   vlib_combined_counter_main_t *cm = map_main.domain_counters;
 504   u32 thread_index = vm->thread_index;
 505
 506   from = vlib_frame_vector_args (frame);
 507   n_left_from = frame->n_vectors;
 508   next_index = node->cached_next_index;
 509   while (n_left_from > 0)
 510     {
 511       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 512
 513       while (n_left_from > 0 && n_left_to_next > 0)
 514         {
 515           u32 pi0;
 516           vlib_buffer_t *p0;
 517           ip6_header_t *ip60;
 518           u8 error0;
 519           u32 l4_len0;
 520           i32 map_port0;
 521           map_domain_t *d0;
 522           ip6_frag_hdr_t *frag0;
 523           ip6_mapt_next_t next0 = 0;
 524           u32 saddr;
 525
 526           pi0 = to_next[0] = from[0];
 527           from += 1;
 528           n_left_from -= 1;
 529           to_next += 1;
 530           n_left_to_next -= 1;
 531           error0 = MAP_ERROR_NONE;
 532
 533           p0 = vlib_get_buffer (vm, pi0);
 534           ip60 = vlib_buffer_get_current (p0);
 535
 536           d0 =
 537             ip6_map_get_domain (&ip60->dst_address,
 538                                 &vnet_buffer (p0)->map_t.map_domain_index,
 539                                 &error0);
 540           if (!d0)
 541             {                   /* Guess it wasn't for us */
 542               vnet_feature_next (&next0, p0);
 543               goto exit;
 544             }
 545
 546           saddr = map_get_ip4 (&ip60->src_address, d0->ip6_src_len);
 547           vnet_buffer (p0)->map_t.v6.saddr = saddr;
 548           vnet_buffer (p0)->map_t.v6.daddr =
 549             ip6_map_t_embedded_address (d0, &ip60->dst_address);
 550           vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
 551
 552           if (PREDICT_FALSE
 553               (ip6_parse (ip60, p0->current_length,
 554                           &(vnet_buffer (p0)->map_t.v6.l4_protocol),
 555                           &(vnet_buffer (p0)->map_t.v6.l4_offset),
 556                           &(vnet_buffer (p0)->map_t.v6.frag_offset))))
 557             {
 558               error0 =
 559                 error0 == MAP_ERROR_NONE ? MAP_ERROR_MALFORMED : error0;
 560             }
 561
 562           map_port0 = -1;
 563           l4_len0 =
 564             (u32) clib_net_to_host_u16 (ip60->payload_length) +
 565             sizeof (*ip60) - vnet_buffer (p0)->map_t.v6.l4_offset;
 566           frag0 =
 567             (ip6_frag_hdr_t *) u8_ptr_add (ip60,
 568                                            vnet_buffer (p0)->map_t.v6.
 569                                            frag_offset);
 570
 571           if (PREDICT_FALSE
 572               (vnet_buffer (p0)->map_t.v6.frag_offset
 573                && ip6_frag_hdr_offset (frag0)))
 574             {
 575               map_port0 = ip6_map_fragment_get (ip60, frag0, d0);
 576               if (map_port0 == -1)
 577                 error0 =
 578                   error0 ==
 579                   MAP_ERROR_NONE ? MAP_ERROR_FRAGMENT_MEMORY : error0;
 580               else
 581                 next0 = IP6_MAPT_NEXT_MAPT_FRAGMENTED;
 582             }
 583           else
 584             if (PREDICT_TRUE
 585                 (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_TCP))
 586             {
 587               error0 =
 588                 l4_len0 <
 589                 sizeof (tcp_header_t) ? MAP_ERROR_MALFORMED : error0;
 590               vnet_buffer (p0)->map_t.checksum_offset =
 591                 vnet_buffer (p0)->map_t.v6.l4_offset + 16;
 592               next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
 593               map_port0 =
 594                 (i32) *
 595                 ((u16 *)
 596                  u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
 597             }
 598           else
 599             if (PREDICT_TRUE
 600                 (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_UDP))
 601             {
 602               error0 =
 603                 l4_len0 <
 604                 sizeof (udp_header_t) ? MAP_ERROR_MALFORMED : error0;
 605               vnet_buffer (p0)->map_t.checksum_offset =
 606                 vnet_buffer (p0)->map_t.v6.l4_offset + 6;
 607               next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
 608               map_port0 =
 609                 (i32) *
 610                 ((u16 *)
 611                  u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
 612             }
 613           else if (vnet_buffer (p0)->map_t.v6.l4_protocol ==
 614                    IP_PROTOCOL_ICMP6)
 615             {
 616               error0 =
 617                 l4_len0 <
 618                 sizeof (icmp46_header_t) ? MAP_ERROR_MALFORMED : error0;
 619               next0 = IP6_MAPT_NEXT_MAPT_ICMP;
 620               if (((icmp46_header_t *)
 621                    u8_ptr_add (ip60,
 622                                vnet_buffer (p0)->map_t.v6.l4_offset))->code ==
 623                   ICMP6_echo_reply
 624                   || ((icmp46_header_t *)
 625                       u8_ptr_add (ip60,
 626                                   vnet_buffer (p0)->map_t.v6.l4_offset))->
 627                   code == ICMP6_echo_request)
 628                 map_port0 =
 629                   (i32) *
 630                   ((u16 *)
 631                    u8_ptr_add (ip60,
 632                                vnet_buffer (p0)->map_t.v6.l4_offset + 6));
 633             }
 634           else
 635             {
 636               // TODO: In case of 1:1 mapping, it might be possible to
 637               // do something with those packets.
 638               error0 = MAP_ERROR_BAD_PROTOCOL;
 639             }
 640
 641           if (PREDICT_FALSE (map_port0 != -1) &&
 642               (ip60->src_address.as_u64[0] !=
 643                map_get_pfx_net (d0, vnet_buffer (p0)->map_t.v6.saddr,
 644                                 map_port0)
 645                || ip60->src_address.as_u64[1] != map_get_sfx_net (d0,
 646                                                                   vnet_buffer
 647                                                                   (p0)->map_t.
 648                                                                   v6.saddr,
 649                                                                   map_port0)))
 650             {
 651               // Security check when map_port0 is not zero (non-first
 652               // fragment, UDP or TCP)
 653               error0 =
 654                 error0 == MAP_ERROR_NONE ? MAP_ERROR_SEC_CHECK : error0;
 655             }
 656
 657           // Fragmented first packet needs to be cached for following packets
 658           if (PREDICT_FALSE
 659               (vnet_buffer (p0)->map_t.v6.frag_offset
 660                && !ip6_frag_hdr_offset ((ip6_frag_hdr_t *)
 661                                         u8_ptr_add (ip60,
 662                                                     vnet_buffer (p0)->map_t.
 663                                                     v6.frag_offset)))
 664               && (map_port0 != -1) && (d0->ea_bits_len != 0 || !d0->rules)
 665               && (error0 == MAP_ERROR_NONE))
 666             {
 667               ip6_map_fragment_cache (ip60,
 668                                       (ip6_frag_hdr_t *) u8_ptr_add (ip60,
 669                                                                      vnet_buffer
 670                                                                      (p0)->
 671                                                                      map_t.v6.
 672                                                                      frag_offset),
 673                                       d0, map_port0);
 674             }
 675
 676           if (PREDICT_TRUE
 677               (error0 == MAP_ERROR_NONE && next0 != IP6_MAPT_NEXT_MAPT_ICMP))
 678             {
 679               vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
 680                                                thread_index,
 681                                                vnet_buffer (p0)->map_t.
 682                                                map_domain_index, 1,
 683                                                clib_net_to_host_u16 (ip60->
 684                                                                      payload_length));
 685             }
 686
 687           next0 = (error0 != MAP_ERROR_NONE) ? IP6_MAPT_NEXT_DROP : next0;
 688           p0->error = error_node->errors[error0];
 689         exit:
 690           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 691                                            to_next, n_left_to_next, pi0,
 692                                            next0);
 693         }
 694       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 695     }
 696   return frame->n_vectors;
 697 }
 698
 699 static char *map_t_error_strings[] = {
 700 #define _(sym, string) string,
 701   foreach_map_error
 702 #undef _
 703 };
 704
 705 /* *INDENT-OFF* */
 706 VLIB_REGISTER_NODE(ip6_map_t_fragmented_node) = {
 707   .function = ip6_map_t_fragmented,
 708   .name = "ip6-map-t-fragmented",
 709   .vector_size = sizeof (u32),
 710   .format_trace = format_map_trace,
 711   .type = VLIB_NODE_TYPE_INTERNAL,
 712
 713   .n_errors = MAP_N_ERROR,
 714   .error_strings = map_t_error_strings,
 715
 716   .n_next_nodes = IP6_MAPT_FRAGMENTED_N_NEXT,
 717   .next_nodes =
 718   {
 719     [IP6_MAPT_FRAGMENTED_NEXT_IP4_LOOKUP] = "ip4-lookup",
 720     [IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 721     [IP6_MAPT_FRAGMENTED_NEXT_DROP] = "error-drop",
 722   },
 723 };
 724 /* *INDENT-ON* */
 725
 726 /* *INDENT-OFF* */
 727 VLIB_REGISTER_NODE(ip6_map_t_icmp_node) = {
 728   .function = ip6_map_t_icmp,
 729   .name = "ip6-map-t-icmp",
 730   .vector_size = sizeof (u32),
 731   .format_trace = format_map_trace,
 732   .type = VLIB_NODE_TYPE_INTERNAL,
 733
 734   .n_errors = MAP_N_ERROR,
 735   .error_strings = map_t_error_strings,
 736
 737   .n_next_nodes = IP6_MAPT_ICMP_N_NEXT,
 738   .next_nodes =
 739   {
 740     [IP6_MAPT_ICMP_NEXT_IP4_LOOKUP] = "ip4-lookup",
 741     [IP6_MAPT_ICMP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 742     [IP6_MAPT_ICMP_NEXT_DROP] = "error-drop",
 743   },
 744 };
 745 /* *INDENT-ON* */
 746
 747 /* *INDENT-OFF* */
 748 VLIB_REGISTER_NODE(ip6_map_t_tcp_udp_node) = {
 749   .function = ip6_map_t_tcp_udp,
 750   .name = "ip6-map-t-tcp-udp",
 751   .vector_size = sizeof (u32),
 752   .format_trace = format_map_trace,
 753   .type = VLIB_NODE_TYPE_INTERNAL,
 754
 755   .n_errors = MAP_N_ERROR,
 756   .error_strings = map_t_error_strings,
 757
 758   .n_next_nodes = IP6_MAPT_TCP_UDP_N_NEXT,
 759   .next_nodes =
 760   {
 761     [IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP] = "ip4-lookup",
 762     [IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
 763     [IP6_MAPT_TCP_UDP_NEXT_DROP] = "error-drop",
 764   },
 765 };
 766 /* *INDENT-ON* */
 767
 768 /* *INDENT-OFF* */
 769 VNET_FEATURE_INIT(ip4_map_t_feature, static) = {
 770   .arc_name = "ip6-unicast",
 771   .node_name = "ip6-map-t",
 772   .runs_before = VNET_FEATURES("ip6-flow-classify"),
 773 };
 774
 775 VLIB_REGISTER_NODE(ip6_map_t_node) = {
 776   .function = ip6_map_t,
 777   .name = "ip6-map-t",
 778   .vector_size = sizeof(u32),
 779   .format_trace = format_map_trace,
 780   .type = VLIB_NODE_TYPE_INTERNAL,
 781
 782   .n_errors = MAP_N_ERROR,
 783   .error_strings = map_t_error_strings,
 784
 785   .n_next_nodes = IP6_MAPT_N_NEXT,
 786   .next_nodes =
 787   {
 788     [IP6_MAPT_NEXT_MAPT_TCP_UDP] = "ip6-map-t-tcp-udp",
 789     [IP6_MAPT_NEXT_MAPT_ICMP] = "ip6-map-t-icmp",
 790     [IP6_MAPT_NEXT_MAPT_FRAGMENTED] = "ip6-map-t-fragmented",
 791     [IP6_MAPT_NEXT_DROP] = "error-drop",
 792   },
 793 };
 794 /* *INDENT-ON* */
 795
 796 /*
 797  * fd.io coding-style-patch-verification: ON
 798  *
 799  * Local Variables:
 800  * eval: (c-set-style "gnu")
 801  * End:
 802  */