src/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2016 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 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ip/ip_frag.h>
  43 #include <vnet/ip/ip6_neighbor.h>
  44 #include <vnet/ethernet/ethernet.h>     /* for ethernet_header_t */
  45 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  46 #include <vppinfra/cache.h>
  47 #include <vnet/fib/fib_urpf_list.h>     /* for FIB uRPF check */
  48 #include <vnet/fib/ip6_fib.h>
  49 #include <vnet/mfib/ip6_mfib.h>
  50 #include <vnet/dpo/load_balance_map.h>
  51 #include <vnet/dpo/classify_dpo.h>
  52
  53 #include <vppinfra/bihash_template.c>
  54 #include <vnet/ip/ip6_forward.h>
  55
  56 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  57 #define OI_DECAP   0x80000000
  58
  59 static void
  60 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
  61                           ip6_main_t * im, u32 fib_index,
  62                           ip_interface_address_t * a)
  63 {
  64   ip_lookup_main_t *lm = &im->lookup_main;
  65   ip6_address_t *address = ip_interface_address_get_address (lm, a);
  66   fib_prefix_t pfx = {
  67     .fp_len = a->address_length,
  68     .fp_proto = FIB_PROTOCOL_IP6,
  69     .fp_addr.ip6 = *address,
  70   };
  71
  72   if (a->address_length < 128)
  73     {
  74       fib_table_entry_update_one_path (fib_index,
  75                                        &pfx,
  76                                        FIB_SOURCE_INTERFACE,
  77                                        (FIB_ENTRY_FLAG_CONNECTED |
  78                                         FIB_ENTRY_FLAG_ATTACHED),
  79                                        DPO_PROTO_IP6,
  80                                        /* No next-hop address */
  81                                        NULL, sw_if_index,
  82                                        /* invalid FIB index */
  83                                        ~0, 1,
  84                                        /* no label stack */
  85                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
  86     }
  87
  88   pfx.fp_len = 128;
  89   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
  90     {
  91       u32 classify_table_index =
  92         lm->classify_table_index_by_sw_if_index[sw_if_index];
  93       if (classify_table_index != (u32) ~ 0)
  94         {
  95           dpo_id_t dpo = DPO_INVALID;
  96
  97           dpo_set (&dpo,
  98                    DPO_CLASSIFY,
  99                    DPO_PROTO_IP6,
 100                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 101
 102           fib_table_entry_special_dpo_add (fib_index,
 103                                            &pfx,
 104                                            FIB_SOURCE_CLASSIFY,
 105                                            FIB_ENTRY_FLAG_NONE, &dpo);
 106           dpo_reset (&dpo);
 107         }
 108     }
 109
 110   fib_table_entry_update_one_path (fib_index, &pfx,
 111                                    FIB_SOURCE_INTERFACE,
 112                                    (FIB_ENTRY_FLAG_CONNECTED |
 113                                     FIB_ENTRY_FLAG_LOCAL),
 114                                    DPO_PROTO_IP6,
 115                                    &pfx.fp_addr,
 116                                    sw_if_index, ~0,
 117                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 118 }
 119
 120 static void
 121 ip6_del_interface_routes (ip6_main_t * im,
 122                           u32 fib_index,
 123                           ip6_address_t * address, u32 address_length)
 124 {
 125   fib_prefix_t pfx = {
 126     .fp_len = address_length,
 127     .fp_proto = FIB_PROTOCOL_IP6,
 128     .fp_addr.ip6 = *address,
 129   };
 130
 131   if (pfx.fp_len < 128)
 132     {
 133       fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 134
 135     }
 136
 137   pfx.fp_len = 128;
 138   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 139 }
 140
 141 void
 142 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 143 {
 144   ip6_main_t *im = &ip6_main;
 145
 146   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 147
 148   /*
 149    * enable/disable only on the 1<->0 transition
 150    */
 151   if (is_enable)
 152     {
 153       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 154         return;
 155     }
 156   else
 157     {
 158       /* The ref count is 0 when an address is removed from an interface that has
 159        * no address - this is not a ciritical error */
 160       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 161           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 162         return;
 163     }
 164
 165   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 166                                !is_enable, 0, 0);
 167
 168   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 169                                sw_if_index, !is_enable, 0, 0);
 170 }
 171
 172 /* get first interface address */
 173 ip6_address_t *
 174 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 175 {
 176   ip_lookup_main_t *lm = &im->lookup_main;
 177   ip_interface_address_t *ia = 0;
 178   ip6_address_t *result = 0;
 179
 180   /* *INDENT-OFF* */
 181   foreach_ip_interface_address (lm, ia, sw_if_index,
 182                                 1 /* honor unnumbered */,
 183   ({
 184     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 185     result = a;
 186     break;
 187   }));
 188   /* *INDENT-ON* */
 189   return result;
 190 }
 191
 192 clib_error_t *
 193 ip6_add_del_interface_address (vlib_main_t * vm,
 194                                u32 sw_if_index,
 195                                ip6_address_t * address,
 196                                u32 address_length, u32 is_del)
 197 {
 198   vnet_main_t *vnm = vnet_get_main ();
 199   ip6_main_t *im = &ip6_main;
 200   ip_lookup_main_t *lm = &im->lookup_main;
 201   clib_error_t *error;
 202   u32 if_address_index;
 203   ip6_address_fib_t ip6_af, *addr_fib = 0;
 204
 205   /* local0 interface doesn't support IP addressing */
 206   if (sw_if_index == 0)
 207     {
 208       return
 209         clib_error_create ("local0 interface doesn't support IP addressing");
 210     }
 211
 212   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 213   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 214
 215   ip6_addr_fib_init (&ip6_af, address,
 216                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 217   vec_add1 (addr_fib, ip6_af);
 218
 219   /* *INDENT-OFF* */
 220   if (!is_del)
 221     {
 222       /* When adding an address check that it does not conflict
 223          with an existing address on any interface in this table. */
 224       ip_interface_address_t *ia;
 225       vnet_sw_interface_t *sif;
 226
 227       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 228       ({
 229           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 230               im->fib_index_by_sw_if_index[sif->sw_if_index])
 231             {
 232               foreach_ip_interface_address
 233                 (&im->lookup_main, ia, sif->sw_if_index,
 234                  0 /* honor unnumbered */ ,
 235                  ({
 236                    ip6_address_t * x =
 237                      ip_interface_address_get_address
 238                      (&im->lookup_main, ia);
 239                    if (ip6_destination_matches_route
 240                        (im, address, x, ia->address_length) ||
 241                        ip6_destination_matches_route (im,
 242                                                       x,
 243                                                       address,
 244                                                       address_length))
 245                      {
 246                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 247                        return
 248                          clib_error_create
 249                          ("failed to add %U which conflicts with %U for interface %U",
 250                           format_ip6_address_and_length, address,
 251                           address_length,
 252                           format_ip6_address_and_length, x,
 253                           ia->address_length,
 254                           format_vnet_sw_if_index_name, vnm,
 255                           sif->sw_if_index);
 256                      }
 257                  }));
 258             }
 259       }));
 260     }
 261   /* *INDENT-ON* */
 262
 263   {
 264     uword elts_before = pool_elts (lm->if_address_pool);
 265
 266     error = ip_interface_address_add_del
 267       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 268     if (error)
 269       goto done;
 270
 271     /* Pool did not grow: add duplicate address. */
 272     if (elts_before == pool_elts (lm->if_address_pool))
 273       goto done;
 274   }
 275
 276   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 277
 278   if (is_del)
 279     ip6_del_interface_routes (im, ip6_af.fib_index, address, address_length);
 280   else
 281     ip6_add_interface_routes (vnm, sw_if_index,
 282                               im, ip6_af.fib_index,
 283                               pool_elt_at_index (lm->if_address_pool,
 284                                                  if_address_index));
 285
 286   {
 287     ip6_add_del_interface_address_callback_t *cb;
 288     vec_foreach (cb, im->add_del_interface_address_callbacks)
 289       cb->function (im, cb->function_opaque, sw_if_index,
 290                     address, address_length, if_address_index, is_del);
 291   }
 292
 293 done:
 294   vec_free (addr_fib);
 295   return error;
 296 }
 297
 298 clib_error_t *
 299 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 300 {
 301   ip6_main_t *im = &ip6_main;
 302   ip_interface_address_t *ia;
 303   ip6_address_t *a;
 304   u32 is_admin_up, fib_index;
 305
 306   /* Fill in lookup tables with default table (0). */
 307   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 308
 309   vec_validate_init_empty (im->
 310                            lookup_main.if_address_pool_index_by_sw_if_index,
 311                            sw_if_index, ~0);
 312
 313   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 314
 315   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 316
 317   /* *INDENT-OFF* */
 318   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 319                                 0 /* honor unnumbered */,
 320   ({
 321     a = ip_interface_address_get_address (&im->lookup_main, ia);
 322     if (is_admin_up)
 323       ip6_add_interface_routes (vnm, sw_if_index,
 324                                 im, fib_index,
 325                                 ia);
 326     else
 327       ip6_del_interface_routes (im, fib_index,
 328                                 a, ia->address_length);
 329   }));
 330   /* *INDENT-ON* */
 331
 332   return 0;
 333 }
 334
 335 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 336
 337 /* Built-in ip6 unicast rx feature path definition */
 338 /* *INDENT-OFF* */
 339 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 340 {
 341   .arc_name  = "ip6-unicast",
 342   .start_nodes = VNET_FEATURES ("ip6-input"),
 343   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 344 };
 345
 346 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 347 {
 348   .arc_name = "ip6-unicast",
 349   .node_name = "ip6-flow-classify",
 350   .runs_before = VNET_FEATURES ("ip6-inacl"),
 351 };
 352
 353 VNET_FEATURE_INIT (ip6_inacl, static) =
 354 {
 355   .arc_name = "ip6-unicast",
 356   .node_name = "ip6-inacl",
 357   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 358 };
 359
 360 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 361 {
 362   .arc_name = "ip6-unicast",
 363   .node_name = "ip6-policer-classify",
 364   .runs_before = VNET_FEATURES ("ipsec6-input"),
 365 };
 366
 367 VNET_FEATURE_INIT (ip6_ipsec, static) =
 368 {
 369   .arc_name = "ip6-unicast",
 370   .node_name = "ipsec6-input",
 371   .runs_before = VNET_FEATURES ("l2tp-decap"),
 372 };
 373
 374 VNET_FEATURE_INIT (ip6_l2tp, static) =
 375 {
 376   .arc_name = "ip6-unicast",
 377   .node_name = "l2tp-decap",
 378   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 379 };
 380
 381 VNET_FEATURE_INIT (ip6_vpath, static) =
 382 {
 383   .arc_name = "ip6-unicast",
 384   .node_name = "vpath-input-ip6",
 385   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 386 };
 387
 388 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 389 {
 390   .arc_name = "ip6-unicast",
 391   .node_name = "ip6-vxlan-bypass",
 392   .runs_before = VNET_FEATURES ("ip6-lookup"),
 393 };
 394
 395 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 396 {
 397   .arc_name = "ip6-unicast",
 398   .node_name = "ip6-not-enabled",
 399   .runs_before = VNET_FEATURES ("ip6-lookup"),
 400 };
 401
 402 VNET_FEATURE_INIT (ip6_lookup, static) =
 403 {
 404   .arc_name = "ip6-unicast",
 405   .node_name = "ip6-lookup",
 406   .runs_before = 0,  /*last feature*/
 407 };
 408
 409 /* Built-in ip6 multicast rx feature path definition (none now) */
 410 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 411 {
 412   .arc_name  = "ip6-multicast",
 413   .start_nodes = VNET_FEATURES ("ip6-input"),
 414   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 415 };
 416
 417 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 418   .arc_name = "ip6-multicast",
 419   .node_name = "vpath-input-ip6",
 420   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 421 };
 422
 423 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 424   .arc_name = "ip6-multicast",
 425   .node_name = "ip6-not-enabled",
 426   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 427 };
 428
 429 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 430   .arc_name = "ip6-multicast",
 431   .node_name = "ip6-mfib-forward-lookup",
 432   .runs_before = 0, /* last feature */
 433 };
 434
 435 /* Built-in ip4 tx feature path definition */
 436 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 437 {
 438   .arc_name  = "ip6-output",
 439   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 440   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 441 };
 442
 443 VNET_FEATURE_INIT (ip6_outacl, static) = {
 444   .arc_name = "ip6-output",
 445   .node_name = "ip6-outacl",
 446   .runs_before = VNET_FEATURES ("ipsec6-output"),
 447 };
 448
 449 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 450   .arc_name = "ip6-output",
 451   .node_name = "ipsec6-output",
 452   .runs_before = VNET_FEATURES ("interface-output"),
 453 };
 454
 455 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 456   .arc_name = "ip6-output",
 457   .node_name = "interface-output",
 458   .runs_before = 0, /* not before any other features */
 459 };
 460 /* *INDENT-ON* */
 461
 462 clib_error_t *
 463 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 464 {
 465   ip6_main_t *im = &ip6_main;
 466
 467   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 468   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 469
 470   if (!is_add)
 471     {
 472       /* Ensure that IPv6 is disabled */
 473       ip6_main_t *im6 = &ip6_main;
 474       ip_lookup_main_t *lm6 = &im6->lookup_main;
 475       ip_interface_address_t *ia = 0;
 476       ip6_address_t *address;
 477       vlib_main_t *vm = vlib_get_main ();
 478
 479       ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ );
 480       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 481       /* *INDENT-OFF* */
 482       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 483       ({
 484         address = ip_interface_address_get_address (lm6, ia);
 485         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 486       }));
 487       /* *INDENT-ON* */
 488       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 489     }
 490
 491   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 492                                is_add, 0, 0);
 493
 494   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 495                                sw_if_index, is_add, 0, 0);
 496
 497   return /* no error */ 0;
 498 }
 499
 500 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 501
 502 static uword
 503 ip6_lookup (vlib_main_t * vm,
 504             vlib_node_runtime_t * node, vlib_frame_t * frame)
 505 {
 506   return ip6_lookup_inline (vm, node, frame);
 507 }
 508
 509 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 510
 511 /* *INDENT-OFF* */
 512 VLIB_REGISTER_NODE (ip6_lookup_node) =
 513 {
 514   .function = ip6_lookup,
 515   .name = "ip6-lookup",
 516   .vector_size = sizeof (u32),
 517   .format_trace = format_ip6_lookup_trace,
 518   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 519   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 520 };
 521 /* *INDENT-ON* */
 522
 523 VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup);
 524
 525 static uword
 526 ip6_load_balance (vlib_main_t * vm,
 527                   vlib_node_runtime_t * node, vlib_frame_t * frame)
 528 {
 529   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 530   u32 n_left_from, n_left_to_next, *from, *to_next;
 531   ip_lookup_next_t next;
 532   u32 thread_index = vm->thread_index;
 533   ip6_main_t *im = &ip6_main;
 534
 535   from = vlib_frame_vector_args (frame);
 536   n_left_from = frame->n_vectors;
 537   next = node->cached_next_index;
 538
 539   while (n_left_from > 0)
 540     {
 541       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 542
 543
 544       while (n_left_from >= 4 && n_left_to_next >= 2)
 545         {
 546           ip_lookup_next_t next0, next1;
 547           const load_balance_t *lb0, *lb1;
 548           vlib_buffer_t *p0, *p1;
 549           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 550           const ip6_header_t *ip0, *ip1;
 551           const dpo_id_t *dpo0, *dpo1;
 552
 553           /* Prefetch next iteration. */
 554           {
 555             vlib_buffer_t *p2, *p3;
 556
 557             p2 = vlib_get_buffer (vm, from[2]);
 558             p3 = vlib_get_buffer (vm, from[3]);
 559
 560             vlib_prefetch_buffer_header (p2, STORE);
 561             vlib_prefetch_buffer_header (p3, STORE);
 562
 563             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 564             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 565           }
 566
 567           pi0 = to_next[0] = from[0];
 568           pi1 = to_next[1] = from[1];
 569
 570           from += 2;
 571           n_left_from -= 2;
 572           to_next += 2;
 573           n_left_to_next -= 2;
 574
 575           p0 = vlib_get_buffer (vm, pi0);
 576           p1 = vlib_get_buffer (vm, pi1);
 577
 578           ip0 = vlib_buffer_get_current (p0);
 579           ip1 = vlib_buffer_get_current (p1);
 580           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 581           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 582
 583           lb0 = load_balance_get (lbi0);
 584           lb1 = load_balance_get (lbi1);
 585
 586           /*
 587            * this node is for via FIBs we can re-use the hash value from the
 588            * to node if present.
 589            * We don't want to use the same hash value at each level in the recursion
 590            * graph as that would lead to polarisation
 591            */
 592           hc0 = hc1 = 0;
 593
 594           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 595             {
 596               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 597                 {
 598                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 599                     vnet_buffer (p0)->ip.flow_hash >> 1;
 600                 }
 601               else
 602                 {
 603                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 604                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 605                 }
 606               dpo0 =
 607                 load_balance_get_fwd_bucket (lb0,
 608                                              (hc0 &
 609                                               lb0->lb_n_buckets_minus_1));
 610             }
 611           else
 612             {
 613               dpo0 = load_balance_get_bucket_i (lb0, 0);
 614             }
 615           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 616             {
 617               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 618                 {
 619                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 620                     vnet_buffer (p1)->ip.flow_hash >> 1;
 621                 }
 622               else
 623                 {
 624                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 625                     ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 626                 }
 627               dpo1 =
 628                 load_balance_get_fwd_bucket (lb1,
 629                                              (hc1 &
 630                                               lb1->lb_n_buckets_minus_1));
 631             }
 632           else
 633             {
 634               dpo1 = load_balance_get_bucket_i (lb1, 0);
 635             }
 636
 637           next0 = dpo0->dpoi_next_node;
 638           next1 = dpo1->dpoi_next_node;
 639
 640           /* Only process the HBH Option Header if explicitly configured to do so */
 641           if (PREDICT_FALSE
 642               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 643             {
 644               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 645                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 646             }
 647           /* Only process the HBH Option Header if explicitly configured to do so */
 648           if (PREDICT_FALSE
 649               (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 650             {
 651               next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 652                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 653             }
 654
 655           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 656           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 657
 658           vlib_increment_combined_counter
 659             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 660           vlib_increment_combined_counter
 661             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 662
 663           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 664                                            to_next, n_left_to_next,
 665                                            pi0, pi1, next0, next1);
 666         }
 667
 668       while (n_left_from > 0 && n_left_to_next > 0)
 669         {
 670           ip_lookup_next_t next0;
 671           const load_balance_t *lb0;
 672           vlib_buffer_t *p0;
 673           u32 pi0, lbi0, hc0;
 674           const ip6_header_t *ip0;
 675           const dpo_id_t *dpo0;
 676
 677           pi0 = from[0];
 678           to_next[0] = pi0;
 679           from += 1;
 680           to_next += 1;
 681           n_left_to_next -= 1;
 682           n_left_from -= 1;
 683
 684           p0 = vlib_get_buffer (vm, pi0);
 685
 686           ip0 = vlib_buffer_get_current (p0);
 687           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 688
 689           lb0 = load_balance_get (lbi0);
 690
 691           hc0 = 0;
 692           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 693             {
 694               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 695                 {
 696                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 697                     vnet_buffer (p0)->ip.flow_hash >> 1;
 698                 }
 699               else
 700                 {
 701                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 702                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 703                 }
 704               dpo0 =
 705                 load_balance_get_fwd_bucket (lb0,
 706                                              (hc0 &
 707                                               lb0->lb_n_buckets_minus_1));
 708             }
 709           else
 710             {
 711               dpo0 = load_balance_get_bucket_i (lb0, 0);
 712             }
 713
 714           next0 = dpo0->dpoi_next_node;
 715           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 716
 717           /* Only process the HBH Option Header if explicitly configured to do so */
 718           if (PREDICT_FALSE
 719               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 720             {
 721               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 722                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 723             }
 724
 725           vlib_increment_combined_counter
 726             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 727
 728           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 729                                            to_next, n_left_to_next,
 730                                            pi0, next0);
 731         }
 732
 733       vlib_put_next_frame (vm, node, next, n_left_to_next);
 734     }
 735
 736   if (node->flags & VLIB_NODE_FLAG_TRACE)
 737     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 738
 739   return frame->n_vectors;
 740 }
 741
 742 /* *INDENT-OFF* */
 743 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 744 {
 745   .function = ip6_load_balance,
 746   .name = "ip6-load-balance",
 747   .vector_size = sizeof (u32),
 748   .sibling_of = "ip6-lookup",
 749   .format_trace = format_ip6_lookup_trace,
 750 };
 751 /* *INDENT-ON* */
 752
 753 VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance);
 754
 755 typedef struct
 756 {
 757   /* Adjacency taken. */
 758   u32 adj_index;
 759   u32 flow_hash;
 760   u32 fib_index;
 761
 762   /* Packet data, possibly *after* rewrite. */
 763   u8 packet_data[128 - 1 * sizeof (u32)];
 764 }
 765 ip6_forward_next_trace_t;
 766
 767 u8 *
 768 format_ip6_forward_next_trace (u8 * s, va_list * args)
 769 {
 770   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 771   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 772   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 773   u32 indent = format_get_indent (s);
 774
 775   s = format (s, "%U%U",
 776               format_white_space, indent,
 777               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 778   return s;
 779 }
 780
 781 static u8 *
 782 format_ip6_lookup_trace (u8 * s, va_list * args)
 783 {
 784   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 785   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 786   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 787   u32 indent = format_get_indent (s);
 788
 789   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 790               t->fib_index, t->adj_index, t->flow_hash);
 791   s = format (s, "\n%U%U",
 792               format_white_space, indent,
 793               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 794   return s;
 795 }
 796
 797
 798 static u8 *
 799 format_ip6_rewrite_trace (u8 * s, va_list * args)
 800 {
 801   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 802   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 803   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 804   u32 indent = format_get_indent (s);
 805
 806   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 807               t->fib_index, t->adj_index, format_ip_adjacency,
 808               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 809   s = format (s, "\n%U%U",
 810               format_white_space, indent,
 811               format_ip_adjacency_packet_data,
 812               t->adj_index, t->packet_data, sizeof (t->packet_data));
 813   return s;
 814 }
 815
 816 /* Common trace function for all ip6-forward next nodes. */
 817 void
 818 ip6_forward_next_trace (vlib_main_t * vm,
 819                         vlib_node_runtime_t * node,
 820                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 821 {
 822   u32 *from, n_left;
 823   ip6_main_t *im = &ip6_main;
 824
 825   n_left = frame->n_vectors;
 826   from = vlib_frame_vector_args (frame);
 827
 828   while (n_left >= 4)
 829     {
 830       u32 bi0, bi1;
 831       vlib_buffer_t *b0, *b1;
 832       ip6_forward_next_trace_t *t0, *t1;
 833
 834       /* Prefetch next iteration. */
 835       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 836       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 837
 838       bi0 = from[0];
 839       bi1 = from[1];
 840
 841       b0 = vlib_get_buffer (vm, bi0);
 842       b1 = vlib_get_buffer (vm, bi1);
 843
 844       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 845         {
 846           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 847           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 848           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 849           t0->fib_index =
 850             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 851              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 852             vec_elt (im->fib_index_by_sw_if_index,
 853                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 854
 855           clib_memcpy (t0->packet_data,
 856                        vlib_buffer_get_current (b0),
 857                        sizeof (t0->packet_data));
 858         }
 859       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 860         {
 861           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 862           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 863           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 864           t1->fib_index =
 865             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 866              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 867             vec_elt (im->fib_index_by_sw_if_index,
 868                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 869
 870           clib_memcpy (t1->packet_data,
 871                        vlib_buffer_get_current (b1),
 872                        sizeof (t1->packet_data));
 873         }
 874       from += 2;
 875       n_left -= 2;
 876     }
 877
 878   while (n_left >= 1)
 879     {
 880       u32 bi0;
 881       vlib_buffer_t *b0;
 882       ip6_forward_next_trace_t *t0;
 883
 884       bi0 = from[0];
 885
 886       b0 = vlib_get_buffer (vm, bi0);
 887
 888       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 889         {
 890           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 891           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 892           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 893           t0->fib_index =
 894             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 895              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 896             vec_elt (im->fib_index_by_sw_if_index,
 897                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 898
 899           clib_memcpy (t0->packet_data,
 900                        vlib_buffer_get_current (b0),
 901                        sizeof (t0->packet_data));
 902         }
 903       from += 1;
 904       n_left -= 1;
 905     }
 906 }
 907
 908 /* Compute TCP/UDP/ICMP6 checksum in software. */
 909 u16
 910 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
 911                                    ip6_header_t * ip0, int *bogus_lengthp)
 912 {
 913   ip_csum_t sum0;
 914   u16 sum16, payload_length_host_byte_order;
 915   u32 i, n_this_buffer, n_bytes_left;
 916   u32 headers_size = sizeof (ip0[0]);
 917   void *data_this_buffer;
 918
 919   ASSERT (bogus_lengthp);
 920   *bogus_lengthp = 0;
 921
 922   /* Initialize checksum with ip header. */
 923   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
 924   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
 925   data_this_buffer = (void *) (ip0 + 1);
 926
 927   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
 928     {
 929       sum0 = ip_csum_with_carry (sum0,
 930                                  clib_mem_unaligned (&ip0->
 931                                                      src_address.as_uword[i],
 932                                                      uword));
 933       sum0 =
 934         ip_csum_with_carry (sum0,
 935                             clib_mem_unaligned (&ip0->dst_address.as_uword[i],
 936                                                 uword));
 937     }
 938
 939   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
 940    * or UDP-Ping packets */
 941   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 942     {
 943       u32 skip_bytes;
 944       ip6_hop_by_hop_ext_t *ext_hdr =
 945         (ip6_hop_by_hop_ext_t *) data_this_buffer;
 946
 947       /* validate really icmp6 next */
 948       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
 949               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
 950
 951       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
 952       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
 953
 954       payload_length_host_byte_order -= skip_bytes;
 955       headers_size += skip_bytes;
 956     }
 957
 958   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
 959   if (p0 && n_this_buffer + headers_size > p0->current_length)
 960     n_this_buffer =
 961       p0->current_length >
 962       headers_size ? p0->current_length - headers_size : 0;
 963   while (1)
 964     {
 965       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
 966       n_bytes_left -= n_this_buffer;
 967       if (n_bytes_left == 0)
 968         break;
 969
 970       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
 971         {
 972           *bogus_lengthp = 1;
 973           return 0xfefe;
 974         }
 975       p0 = vlib_get_buffer (vm, p0->next_buffer);
 976       data_this_buffer = vlib_buffer_get_current (p0);
 977       n_this_buffer = p0->current_length;
 978     }
 979
 980   sum16 = ~ip_csum_fold (sum0);
 981
 982   return sum16;
 983 }
 984
 985 u32
 986 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
 987 {
 988   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
 989   udp_header_t *udp0;
 990   u16 sum16;
 991   int bogus_length;
 992
 993   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
 994   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
 995           || ip0->protocol == IP_PROTOCOL_ICMP6
 996           || ip0->protocol == IP_PROTOCOL_UDP
 997           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
 998
 999   udp0 = (void *) (ip0 + 1);
1000   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1001     {
1002       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1003                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1004       return p0->flags;
1005     }
1006
1007   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1008
1009   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1010                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1011
1012   return p0->flags;
1013 }
1014
1015 /**
1016  * @brief returns number of links on which src is reachable.
1017  */
1018 always_inline int
1019 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1020 {
1021   const load_balance_t *lb0;
1022   index_t lbi;
1023   u32 fib_index;
1024
1025   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1026                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1027   fib_index =
1028     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1029     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1030
1031   lbi = ip6_fib_table_fwding_lookup (im, fib_index, &i->src_address);
1032   lb0 = load_balance_get (lbi);
1033
1034   return (fib_urpf_check_size (lb0->lb_urpf));
1035 }
1036
1037 always_inline u8
1038 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1039                            u32 * udp_offset0)
1040 {
1041   u32 proto0;
1042   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1043   if (proto0 != IP_PROTOCOL_UDP)
1044     {
1045       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1046       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1047     }
1048   return proto0;
1049 }
1050
1051 /* *INDENT-OFF* */
1052 VNET_FEATURE_ARC_INIT (ip6_local) =
1053 {
1054   .arc_name  = "ip6-local",
1055   .start_nodes = VNET_FEATURES ("ip6-local"),
1056 };
1057 /* *INDENT-ON* */
1058
1059 static uword
1060 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1061                   vlib_frame_t * frame, int head_of_feature_arc)
1062 {
1063   ip6_main_t *im = &ip6_main;
1064   ip_lookup_main_t *lm = &im->lookup_main;
1065   ip_local_next_t next_index;
1066   u32 *from, *to_next, n_left_from, n_left_to_next;
1067   vlib_node_runtime_t *error_node =
1068     vlib_node_get_runtime (vm, ip6_input_node.index);
1069   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1070
1071   from = vlib_frame_vector_args (frame);
1072   n_left_from = frame->n_vectors;
1073   next_index = node->cached_next_index;
1074
1075   if (node->flags & VLIB_NODE_FLAG_TRACE)
1076     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1077
1078   while (n_left_from > 0)
1079     {
1080       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1081
1082       while (n_left_from >= 4 && n_left_to_next >= 2)
1083         {
1084           vlib_buffer_t *p0, *p1;
1085           ip6_header_t *ip0, *ip1;
1086           udp_header_t *udp0, *udp1;
1087           u32 pi0, ip_len0, udp_len0, flags0, next0;
1088           u32 pi1, ip_len1, udp_len1, flags1, next1;
1089           i32 len_diff0, len_diff1;
1090           u8 error0, type0, good_l4_csum0, is_tcp_udp0;
1091           u8 error1, type1, good_l4_csum1, is_tcp_udp1;
1092           u32 udp_offset0, udp_offset1;
1093
1094           pi0 = to_next[0] = from[0];
1095           pi1 = to_next[1] = from[1];
1096           from += 2;
1097           n_left_from -= 2;
1098           to_next += 2;
1099           n_left_to_next -= 2;
1100
1101           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1102
1103           p0 = vlib_get_buffer (vm, pi0);
1104           p1 = vlib_get_buffer (vm, pi1);
1105
1106           ip0 = vlib_buffer_get_current (p0);
1107           ip1 = vlib_buffer_get_current (p1);
1108
1109           if (head_of_feature_arc == 0)
1110             goto skip_checks;
1111
1112           vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1113           vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1114
1115           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1116           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1117
1118           flags0 = p0->flags;
1119           flags1 = p1->flags;
1120
1121           is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0);
1122           is_tcp_udp1 = ip6_next_proto_is_tcp_udp (p1, ip1, &udp_offset1);
1123
1124           good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1125                            || (flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1126                                || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1127             != 0;
1128           good_l4_csum1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1129                            || (flags1 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1130                                || flags1 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1131             != 0;
1132           len_diff0 = 0;
1133           len_diff1 = 0;
1134
1135           if (PREDICT_TRUE (is_tcp_udp0))
1136             {
1137               udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
1138               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1139               good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
1140                 && udp0->checksum == 0;
1141               /* Verify UDP length. */
1142               if (is_tcp_udp0 == IP_PROTOCOL_UDP)
1143                 {
1144                   ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1145                   udp_len0 = clib_net_to_host_u16 (udp0->length);
1146                   len_diff0 = ip_len0 - udp_len0;
1147                 }
1148             }
1149           if (PREDICT_TRUE (is_tcp_udp1))
1150             {
1151               udp1 = (udp_header_t *) ((u8 *) ip1 + udp_offset1);
1152               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1153               good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP
1154                 && udp1->checksum == 0;
1155               /* Verify UDP length. */
1156               if (is_tcp_udp1 == IP_PROTOCOL_UDP)
1157                 {
1158                   ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1159                   udp_len1 = clib_net_to_host_u16 (udp1->length);
1160                   len_diff1 = ip_len1 - udp_len1;
1161                 }
1162             }
1163
1164           good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1165           good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1166
1167           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1168           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1169
1170           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1171                              && !good_l4_csum0
1172                              && !(flags0 &
1173                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1174             {
1175               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1176               good_l4_csum0 =
1177                 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1178             }
1179           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1180                              && !good_l4_csum1
1181                              && !(flags1 &
1182                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1183             {
1184               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1185               good_l4_csum1 =
1186                 (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1187             }
1188
1189           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1190           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1191           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1192
1193           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1194                   IP6_ERROR_UDP_CHECKSUM);
1195           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1196                   IP6_ERROR_ICMP_CHECKSUM);
1197           error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
1198           error1 = (!good_l4_csum1 ? IP6_ERROR_UDP_CHECKSUM + type1 : error1);
1199
1200           /* Drop packets from unroutable hosts. */
1201           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1202           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1203               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1204               !ip6_address_is_link_local_unicast (&ip0->src_address))
1205             {
1206               error0 = (!ip6_urpf_loose_check (im, p0, ip0)
1207                         ? IP6_ERROR_SRC_LOOKUP_MISS : error0);
1208             }
1209           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1210               type1 != IP_BUILTIN_PROTOCOL_ICMP &&
1211               !ip6_address_is_link_local_unicast (&ip1->src_address))
1212             {
1213               error1 = (!ip6_urpf_loose_check (im, p1, ip1)
1214                         ? IP6_ERROR_SRC_LOOKUP_MISS : error1);
1215             }
1216
1217           vnet_buffer (p0)->ip.fib_index =
1218             vnet_buffer (p0)->sw_if_index[VLIB_TX] != ~0 ?
1219             vnet_buffer (p0)->sw_if_index[VLIB_TX] :
1220             vnet_buffer (p0)->ip.fib_index;
1221
1222           vnet_buffer (p1)->ip.fib_index =
1223             vnet_buffer (p1)->sw_if_index[VLIB_TX] != ~0 ?
1224             vnet_buffer (p1)->sw_if_index[VLIB_TX] :
1225             vnet_buffer (p1)->ip.fib_index;
1226
1227         skip_checks:
1228
1229           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1230           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1231
1232           next0 =
1233             error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1234           next1 =
1235             error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1236
1237           p0->error = error_node->errors[error0];
1238           p1->error = error_node->errors[error1];
1239
1240           if (head_of_feature_arc)
1241             {
1242               if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1243                 vnet_feature_arc_start (arc_index,
1244                                         vnet_buffer (p0)->sw_if_index
1245                                         [VLIB_RX], &next0, p0);
1246               if (PREDICT_TRUE (error1 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1247                 vnet_feature_arc_start (arc_index,
1248                                         vnet_buffer (p1)->sw_if_index
1249                                         [VLIB_RX], &next1, p1);
1250             }
1251
1252           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1253                                            to_next, n_left_to_next,
1254                                            pi0, pi1, next0, next1);
1255         }
1256
1257       while (n_left_from > 0 && n_left_to_next > 0)
1258         {
1259           vlib_buffer_t *p0;
1260           ip6_header_t *ip0;
1261           udp_header_t *udp0;
1262           u32 pi0, ip_len0, udp_len0, flags0, next0;
1263           i32 len_diff0;
1264           u8 error0, type0, good_l4_csum0;
1265           u32 udp_offset0;
1266           u8 is_tcp_udp0;
1267
1268           pi0 = to_next[0] = from[0];
1269           from += 1;
1270           n_left_from -= 1;
1271           to_next += 1;
1272           n_left_to_next -= 1;
1273
1274           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1275
1276           p0 = vlib_get_buffer (vm, pi0);
1277           ip0 = vlib_buffer_get_current (p0);
1278
1279           if (head_of_feature_arc == 0)
1280             goto skip_check;
1281
1282           vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1283
1284           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1285           flags0 = p0->flags;
1286           is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0);
1287           good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1288                            || (flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1289                                || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1290             != 0;
1291
1292           len_diff0 = 0;
1293           if (PREDICT_TRUE (is_tcp_udp0))
1294             {
1295               udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
1296               /* Don't verify UDP checksum for packets with explicit zero
1297                * checksum. */
1298               good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
1299                 && udp0->checksum == 0;
1300               /* Verify UDP length. */
1301               if (is_tcp_udp0 == IP_PROTOCOL_UDP)
1302                 {
1303                   ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1304                   udp_len0 = clib_net_to_host_u16 (udp0->length);
1305                   len_diff0 = ip_len0 - udp_len0;
1306                 }
1307             }
1308
1309           good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1310           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1311
1312           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1313                              && !good_l4_csum0
1314                              && !(flags0 &
1315                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1316             {
1317               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1318               good_l4_csum0 =
1319                 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1320             }
1321
1322           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1323           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1324
1325           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1326                   IP6_ERROR_UDP_CHECKSUM);
1327           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1328                   IP6_ERROR_ICMP_CHECKSUM);
1329           error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
1330
1331           /* If this is a neighbor solicitation (ICMP), skip src RPF check */
1332           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1333               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1334               !ip6_address_is_link_local_unicast (&ip0->src_address))
1335             {
1336               error0 = (!ip6_urpf_loose_check (im, p0, ip0)
1337                         ? IP6_ERROR_SRC_LOOKUP_MISS : error0);
1338             }
1339
1340           vnet_buffer (p0)->ip.fib_index =
1341             vnet_buffer (p0)->sw_if_index[VLIB_TX] != ~0 ?
1342             vnet_buffer (p0)->sw_if_index[VLIB_TX] :
1343             vnet_buffer (p0)->ip.fib_index;
1344
1345         skip_check:
1346
1347           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1348           next0 =
1349             error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1350
1351           p0->error = error_node->errors[error0];
1352
1353           if (head_of_feature_arc)
1354             {
1355               if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1356                 vnet_feature_arc_start (arc_index,
1357                                         vnet_buffer (p0)->sw_if_index
1358                                         [VLIB_RX], &next0, p0);
1359             }
1360
1361           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1362                                            to_next, n_left_to_next,
1363                                            pi0, next0);
1364         }
1365
1366       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1367     }
1368
1369   return frame->n_vectors;
1370 }
1371
1372 static uword
1373 ip6_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1374 {
1375   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1376 }
1377
1378 /* *INDENT-OFF* */
1379 VLIB_REGISTER_NODE (ip6_local_node, static) =
1380 {
1381   .function = ip6_local,
1382   .name = "ip6-local",
1383   .vector_size = sizeof (u32),
1384   .format_trace = format_ip6_forward_next_trace,
1385   .n_next_nodes = IP_LOCAL_N_NEXT,
1386   .next_nodes =
1387   {
1388     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1389     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1390     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1391     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1392     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-reassembly",
1393   },
1394 };
1395 /* *INDENT-ON* */
1396
1397 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local);
1398
1399
1400 static uword
1401 ip6_local_end_of_arc (vlib_main_t * vm,
1402                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1403 {
1404   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1405 }
1406
1407 /* *INDENT-OFF* */
1408 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node,static) = {
1409   .function = ip6_local_end_of_arc,
1410   .name = "ip6-local-end-of-arc",
1411   .vector_size = sizeof (u32),
1412
1413   .format_trace = format_ip6_forward_next_trace,
1414   .sibling_of = "ip6-local",
1415 };
1416
1417 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_end_of_arc_node, ip6_local_end_of_arc)
1418
1419 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1420   .arc_name = "ip6-local",
1421   .node_name = "ip6-local-end-of-arc",
1422   .runs_before = 0, /* not before any other features */
1423 };
1424 /* *INDENT-ON* */
1425
1426 void
1427 ip6_register_protocol (u32 protocol, u32 node_index)
1428 {
1429   vlib_main_t *vm = vlib_get_main ();
1430   ip6_main_t *im = &ip6_main;
1431   ip_lookup_main_t *lm = &im->lookup_main;
1432
1433   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1434   lm->local_next_by_ip_protocol[protocol] =
1435     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1436 }
1437
1438 clib_error_t *
1439 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1440                     u8 refresh)
1441 {
1442   vnet_main_t *vnm = vnet_get_main ();
1443   ip6_main_t *im = &ip6_main;
1444   icmp6_neighbor_solicitation_header_t *h;
1445   ip6_address_t *src;
1446   ip_interface_address_t *ia;
1447   ip_adjacency_t *adj;
1448   vnet_hw_interface_t *hi;
1449   vnet_sw_interface_t *si;
1450   vlib_buffer_t *b;
1451   adj_index_t ai;
1452   u32 bi = 0;
1453   int bogus_length;
1454
1455   si = vnet_get_sw_interface (vnm, sw_if_index);
1456
1457   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1458     {
1459       return clib_error_return (0, "%U: interface %U down",
1460                                 format_ip6_address, dst,
1461                                 format_vnet_sw_if_index_name, vnm,
1462                                 sw_if_index);
1463     }
1464
1465   src =
1466     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1467   if (!src)
1468     {
1469       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1470       return clib_error_return
1471         (0, "no matching interface address for destination %U (interface %U)",
1472          format_ip6_address, dst,
1473          format_vnet_sw_if_index_name, vnm, sw_if_index);
1474     }
1475
1476   h =
1477     vlib_packet_template_get_packet (vm,
1478                                      &im->discover_neighbor_packet_template,
1479                                      &bi);
1480   if (!h)
1481     return clib_error_return (0, "ICMP6 NS packet allocation failed");
1482
1483   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1484
1485   /* Destination address is a solicited node multicast address.  We need to fill in
1486      the low 24 bits with low 24 bits of target's address. */
1487   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1488   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1489   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1490
1491   h->ip.src_address = src[0];
1492   h->neighbor.target_address = dst[0];
1493
1494   if (PREDICT_FALSE (!hi->hw_address))
1495     {
1496       return clib_error_return (0, "%U: interface %U do not support ip probe",
1497                                 format_ip6_address, dst,
1498                                 format_vnet_sw_if_index_name, vnm,
1499                                 sw_if_index);
1500     }
1501
1502   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address,
1503                vec_len (hi->hw_address));
1504
1505   h->neighbor.icmp.checksum =
1506     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1507   ASSERT (bogus_length == 0);
1508
1509   b = vlib_get_buffer (vm, bi);
1510   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1511     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1512
1513   /* Add encapsulation string for software interface (e.g. ethernet header). */
1514   ip46_address_t nh = {
1515     .ip6 = *dst,
1516   };
1517
1518   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1519                             VNET_LINK_IP6, &nh, sw_if_index);
1520   adj = adj_get (ai);
1521
1522   /* Peer has been previously resolved, retrieve glean adj instead */
1523   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1524     {
1525       adj_unlock (ai);
1526       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1527                                   VNET_LINK_IP6, sw_if_index, &nh);
1528       adj = adj_get (ai);
1529     }
1530
1531   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1532   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1533
1534   {
1535     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1536     u32 *to_next = vlib_frame_vector_args (f);
1537     to_next[0] = bi;
1538     f->n_vectors = 1;
1539     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1540   }
1541
1542   adj_unlock (ai);
1543   return /* no error */ 0;
1544 }
1545
1546 typedef enum
1547 {
1548   IP6_REWRITE_NEXT_DROP,
1549   IP6_REWRITE_NEXT_ICMP_ERROR,
1550   IP6_REWRITE_NEXT_FRAGMENT,
1551   IP6_REWRITE_N_NEXT            /* Last */
1552 } ip6_rewrite_next_t;
1553
1554 /**
1555  * This bits of an IPv6 address to mask to construct a multicast
1556  * MAC address
1557  */
1558 #define IP6_MCAST_ADDR_MASK 0xffffffff
1559
1560 always_inline void
1561 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1562                u16 adj_packet_bytes, bool is_locally_generated,
1563                u32 * next, u32 * error)
1564 {
1565   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1566     {
1567       if (is_locally_generated)
1568         {
1569           /* IP fragmentation */
1570           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1571                                    IP6_FRAG_NEXT_IP6_REWRITE, 0);
1572           *next = IP6_REWRITE_NEXT_FRAGMENT;
1573           *error = IP6_ERROR_MTU_EXCEEDED;
1574         }
1575       else
1576         {
1577           *error = IP6_ERROR_MTU_EXCEEDED;
1578           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1579                                        adj_packet_bytes);
1580           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1581         }
1582     }
1583 }
1584
1585 always_inline uword
1586 ip6_rewrite_inline (vlib_main_t * vm,
1587                     vlib_node_runtime_t * node,
1588                     vlib_frame_t * frame,
1589                     int do_counters, int is_midchain, int is_mcast)
1590 {
1591   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1592   u32 *from = vlib_frame_vector_args (frame);
1593   u32 n_left_from, n_left_to_next, *to_next, next_index;
1594   vlib_node_runtime_t *error_node =
1595     vlib_node_get_runtime (vm, ip6_input_node.index);
1596
1597   n_left_from = frame->n_vectors;
1598   next_index = node->cached_next_index;
1599   u32 thread_index = vm->thread_index;
1600
1601   while (n_left_from > 0)
1602     {
1603       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1604
1605       while (n_left_from >= 4 && n_left_to_next >= 2)
1606         {
1607           ip_adjacency_t *adj0, *adj1;
1608           vlib_buffer_t *p0, *p1;
1609           ip6_header_t *ip0, *ip1;
1610           u32 pi0, rw_len0, next0, error0, adj_index0;
1611           u32 pi1, rw_len1, next1, error1, adj_index1;
1612           u32 tx_sw_if_index0, tx_sw_if_index1;
1613           bool is_locally_originated0, is_locally_originated1;
1614
1615           /* Prefetch next iteration. */
1616           {
1617             vlib_buffer_t *p2, *p3;
1618
1619             p2 = vlib_get_buffer (vm, from[2]);
1620             p3 = vlib_get_buffer (vm, from[3]);
1621
1622             vlib_prefetch_buffer_header (p2, LOAD);
1623             vlib_prefetch_buffer_header (p3, LOAD);
1624
1625             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1626             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1627
1628             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1629             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1630           }
1631
1632           pi0 = to_next[0] = from[0];
1633           pi1 = to_next[1] = from[1];
1634
1635           from += 2;
1636           n_left_from -= 2;
1637           to_next += 2;
1638           n_left_to_next -= 2;
1639
1640           p0 = vlib_get_buffer (vm, pi0);
1641           p1 = vlib_get_buffer (vm, pi1);
1642
1643           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1644           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1645
1646           ip0 = vlib_buffer_get_current (p0);
1647           ip1 = vlib_buffer_get_current (p1);
1648
1649           error0 = error1 = IP6_ERROR_NONE;
1650           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1651
1652           is_locally_originated0 =
1653             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1654           if (PREDICT_TRUE (!is_locally_originated0))
1655             {
1656               i32 hop_limit0 = ip0->hop_limit;
1657
1658               /* Input node should have reject packets with hop limit 0. */
1659               ASSERT (ip0->hop_limit > 0);
1660
1661               hop_limit0 -= 1;
1662
1663               ip0->hop_limit = hop_limit0;
1664
1665               /*
1666                * If the hop count drops below 1 when forwarding, generate
1667                * an ICMP response.
1668                */
1669               if (PREDICT_FALSE (hop_limit0 <= 0))
1670                 {
1671                   error0 = IP6_ERROR_TIME_EXPIRED;
1672                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1673                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1674                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1675                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1676                                                0);
1677                 }
1678             }
1679           else
1680             {
1681               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1682             }
1683           is_locally_originated1 =
1684             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1685           if (PREDICT_TRUE (!is_locally_originated1))
1686             {
1687               i32 hop_limit1 = ip1->hop_limit;
1688
1689               /* Input node should have reject packets with hop limit 0. */
1690               ASSERT (ip1->hop_limit > 0);
1691
1692               hop_limit1 -= 1;
1693
1694               ip1->hop_limit = hop_limit1;
1695
1696               /*
1697                * If the hop count drops below 1 when forwarding, generate
1698                * an ICMP response.
1699                */
1700               if (PREDICT_FALSE (hop_limit1 <= 0))
1701                 {
1702                   error1 = IP6_ERROR_TIME_EXPIRED;
1703                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1704                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1705                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1706                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1707                                                0);
1708                 }
1709             }
1710           else
1711             {
1712               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1713             }
1714           adj0 = adj_get (adj_index0);
1715           adj1 = adj_get (adj_index1);
1716
1717           rw_len0 = adj0[0].rewrite_header.data_bytes;
1718           rw_len1 = adj1[0].rewrite_header.data_bytes;
1719           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1720           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1721
1722           if (do_counters)
1723             {
1724               vlib_increment_combined_counter
1725                 (&adjacency_counters,
1726                  thread_index, adj_index0, 1,
1727                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1728               vlib_increment_combined_counter
1729                 (&adjacency_counters,
1730                  thread_index, adj_index1, 1,
1731                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1732             }
1733
1734           /* Check MTU of outgoing interface. */
1735           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1736                          sizeof (ip6_header_t),
1737                          adj0[0].rewrite_header.max_l3_packet_bytes,
1738                          is_locally_originated0, &next0, &error0);
1739           ip6_mtu_check (p1, clib_net_to_host_u16 (ip1->payload_length) +
1740                          sizeof (ip6_header_t),
1741                          adj1[0].rewrite_header.max_l3_packet_bytes,
1742                          is_locally_originated1, &next1, &error1);
1743
1744           /* Don't adjust the buffer for hop count issue; icmp-error node
1745            * wants to see the IP headerr */
1746           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1747             {
1748               p0->current_data -= rw_len0;
1749               p0->current_length += rw_len0;
1750
1751               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1752               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1753               next0 = adj0[0].rewrite_header.next_index;
1754
1755               if (PREDICT_FALSE
1756                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1757                 vnet_feature_arc_start (lm->output_feature_arc_index,
1758                                         tx_sw_if_index0, &next0, p0);
1759             }
1760           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1761             {
1762               p1->current_data -= rw_len1;
1763               p1->current_length += rw_len1;
1764
1765               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1766               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1767               next1 = adj1[0].rewrite_header.next_index;
1768
1769               if (PREDICT_FALSE
1770                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1771                 vnet_feature_arc_start (lm->output_feature_arc_index,
1772                                         tx_sw_if_index1, &next1, p1);
1773             }
1774
1775           /* Guess we are only writing on simple Ethernet header. */
1776           vnet_rewrite_two_headers (adj0[0], adj1[0],
1777                                     ip0, ip1, sizeof (ethernet_header_t));
1778
1779           if (is_midchain)
1780             {
1781               adj0->sub_type.midchain.fixup_func
1782                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1783               adj1->sub_type.midchain.fixup_func
1784                 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1785             }
1786           if (is_mcast)
1787             {
1788               /*
1789                * copy bytes from the IP address into the MAC rewrite
1790                */
1791               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1792                                           adj0->
1793                                           rewrite_header.dst_mcast_offset,
1794                                           &ip0->dst_address.as_u32[3],
1795                                           (u8 *) ip0);
1796               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1797                                           adj1->
1798                                           rewrite_header.dst_mcast_offset,
1799                                           &ip1->dst_address.as_u32[3],
1800                                           (u8 *) ip1);
1801             }
1802
1803           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1804                                            to_next, n_left_to_next,
1805                                            pi0, pi1, next0, next1);
1806         }
1807
1808       while (n_left_from > 0 && n_left_to_next > 0)
1809         {
1810           ip_adjacency_t *adj0;
1811           vlib_buffer_t *p0;
1812           ip6_header_t *ip0;
1813           u32 pi0, rw_len0;
1814           u32 adj_index0, next0, error0;
1815           u32 tx_sw_if_index0;
1816           bool is_locally_originated0;
1817
1818           pi0 = to_next[0] = from[0];
1819
1820           p0 = vlib_get_buffer (vm, pi0);
1821
1822           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1823
1824           adj0 = adj_get (adj_index0);
1825
1826           ip0 = vlib_buffer_get_current (p0);
1827
1828           error0 = IP6_ERROR_NONE;
1829           next0 = IP6_REWRITE_NEXT_DROP;
1830
1831           /* Check hop limit */
1832           is_locally_originated0 =
1833             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1834           if (PREDICT_TRUE (!is_locally_originated0))
1835             {
1836               i32 hop_limit0 = ip0->hop_limit;
1837
1838               ASSERT (ip0->hop_limit > 0);
1839
1840               hop_limit0 -= 1;
1841
1842               ip0->hop_limit = hop_limit0;
1843
1844               if (PREDICT_FALSE (hop_limit0 <= 0))
1845                 {
1846                   /*
1847                    * If the hop count drops below 1 when forwarding, generate
1848                    * an ICMP response.
1849                    */
1850                   error0 = IP6_ERROR_TIME_EXPIRED;
1851                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1852                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1853                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1854                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1855                                                0);
1856                 }
1857             }
1858           else
1859             {
1860               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1861             }
1862
1863           /* Guess we are only writing on simple Ethernet header. */
1864           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1865
1866           /* Update packet buffer attributes/set output interface. */
1867           rw_len0 = adj0[0].rewrite_header.data_bytes;
1868           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1869
1870           if (do_counters)
1871             {
1872               vlib_increment_combined_counter
1873                 (&adjacency_counters,
1874                  thread_index, adj_index0, 1,
1875                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1876             }
1877
1878           /* Check MTU of outgoing interface. */
1879           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1880                          sizeof (ip6_header_t),
1881                          adj0[0].rewrite_header.max_l3_packet_bytes,
1882                          is_locally_originated0, &next0, &error0);
1883
1884           /* Don't adjust the buffer for hop count issue; icmp-error node
1885            * wants to see the IP header */
1886           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1887             {
1888               p0->current_data -= rw_len0;
1889               p0->current_length += rw_len0;
1890
1891               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1892
1893               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1894               next0 = adj0[0].rewrite_header.next_index;
1895
1896               if (PREDICT_FALSE
1897                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1898                 vnet_feature_arc_start (lm->output_feature_arc_index,
1899                                         tx_sw_if_index0, &next0, p0);
1900             }
1901
1902           if (is_midchain)
1903             {
1904               adj0->sub_type.midchain.fixup_func
1905                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1906             }
1907           if (is_mcast)
1908             {
1909               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1910                                           adj0->
1911                                           rewrite_header.dst_mcast_offset,
1912                                           &ip0->dst_address.as_u32[3],
1913                                           (u8 *) ip0);
1914             }
1915
1916           p0->error = error_node->errors[error0];
1917
1918           from += 1;
1919           n_left_from -= 1;
1920           to_next += 1;
1921           n_left_to_next -= 1;
1922
1923           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1924                                            to_next, n_left_to_next,
1925                                            pi0, next0);
1926         }
1927
1928       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1929     }
1930
1931   /* Need to do trace after rewrites to pick up new packet data. */
1932   if (node->flags & VLIB_NODE_FLAG_TRACE)
1933     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1934
1935   return frame->n_vectors;
1936 }
1937
1938 static uword
1939 ip6_rewrite (vlib_main_t * vm,
1940              vlib_node_runtime_t * node, vlib_frame_t * frame)
1941 {
1942   if (adj_are_counters_enabled ())
1943     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1944   else
1945     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1946 }
1947
1948 static uword
1949 ip6_rewrite_bcast (vlib_main_t * vm,
1950                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1951 {
1952   if (adj_are_counters_enabled ())
1953     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1954   else
1955     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1956 }
1957
1958 static uword
1959 ip6_rewrite_mcast (vlib_main_t * vm,
1960                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1961 {
1962   if (adj_are_counters_enabled ())
1963     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
1964   else
1965     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
1966 }
1967
1968 static uword
1969 ip6_midchain (vlib_main_t * vm,
1970               vlib_node_runtime_t * node, vlib_frame_t * frame)
1971 {
1972   if (adj_are_counters_enabled ())
1973     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
1974   else
1975     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
1976 }
1977
1978 static uword
1979 ip6_mcast_midchain (vlib_main_t * vm,
1980                     vlib_node_runtime_t * node, vlib_frame_t * frame)
1981 {
1982   if (adj_are_counters_enabled ())
1983     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
1984   else
1985     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
1986 }
1987
1988 /* *INDENT-OFF* */
1989 VLIB_REGISTER_NODE (ip6_midchain_node) =
1990 {
1991   .function = ip6_midchain,
1992   .name = "ip6-midchain",
1993   .vector_size = sizeof (u32),
1994   .format_trace = format_ip6_forward_next_trace,
1995   .sibling_of = "ip6-rewrite",
1996   };
1997
1998 VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain);
1999
2000 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2001 {
2002   .function = ip6_rewrite,
2003   .name = "ip6-rewrite",
2004   .vector_size = sizeof (u32),
2005   .format_trace = format_ip6_rewrite_trace,
2006   .n_next_nodes = IP6_REWRITE_N_NEXT,
2007   .next_nodes =
2008   {
2009     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2010     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2011     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2012   },
2013 };
2014
2015 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite);
2016
2017 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2018   .function = ip6_rewrite_bcast,
2019   .name = "ip6-rewrite-bcast",
2020   .vector_size = sizeof (u32),
2021
2022   .format_trace = format_ip6_rewrite_trace,
2023   .sibling_of = "ip6-rewrite",
2024 };
2025 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_bcast_node, ip6_rewrite_bcast)
2026
2027 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2028 {
2029   .function = ip6_rewrite_mcast,
2030   .name = "ip6-rewrite-mcast",
2031   .vector_size = sizeof (u32),
2032   .format_trace = format_ip6_rewrite_trace,
2033   .sibling_of = "ip6-rewrite",
2034 };
2035
2036 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_mcast_node, ip6_rewrite_mcast);
2037
2038 VLIB_REGISTER_NODE (ip6_mcast_midchain_node, static) =
2039 {
2040   .function = ip6_mcast_midchain,
2041   .name = "ip6-mcast-midchain",
2042   .vector_size = sizeof (u32),
2043   .format_trace = format_ip6_rewrite_trace,
2044   .sibling_of = "ip6-rewrite",
2045 };
2046
2047 VLIB_NODE_FUNCTION_MULTIARCH (ip6_mcast_midchain_node, ip6_mcast_midchain);
2048 /* *INDENT-ON* */
2049
2050 /*
2051  * Hop-by-Hop handling
2052  */
2053 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2054
2055 #define foreach_ip6_hop_by_hop_error \
2056 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2057 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2058 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2059
2060 /* *INDENT-OFF* */
2061 typedef enum
2062 {
2063 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2064   foreach_ip6_hop_by_hop_error
2065 #undef _
2066   IP6_HOP_BY_HOP_N_ERROR,
2067 } ip6_hop_by_hop_error_t;
2068 /* *INDENT-ON* */
2069
2070 /*
2071  * Primary h-b-h handler trace support
2072  * We work pretty hard on the problem for obvious reasons
2073  */
2074 typedef struct
2075 {
2076   u32 next_index;
2077   u32 trace_len;
2078   u8 option_data[256];
2079 } ip6_hop_by_hop_trace_t;
2080
2081 vlib_node_registration_t ip6_hop_by_hop_node;
2082
2083 static char *ip6_hop_by_hop_error_strings[] = {
2084 #define _(sym,string) string,
2085   foreach_ip6_hop_by_hop_error
2086 #undef _
2087 };
2088
2089 u8 *
2090 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2091 {
2092   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2093   int total_len = va_arg (*args, int);
2094   ip6_hop_by_hop_option_t *opt0, *limit0;
2095   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2096   u8 type0;
2097
2098   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2099               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2100
2101   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2102   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2103
2104   while (opt0 < limit0)
2105     {
2106       type0 = opt0->type;
2107       switch (type0)
2108         {
2109         case 0:         /* Pad, just stop */
2110           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2111           break;
2112
2113         default:
2114           if (hm->trace[type0])
2115             {
2116               s = (*hm->trace[type0]) (s, opt0);
2117             }
2118           else
2119             {
2120               s =
2121                 format (s, "\n    unrecognized option %d length %d", type0,
2122                         opt0->length);
2123             }
2124           opt0 =
2125             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2126                                          sizeof (ip6_hop_by_hop_option_t));
2127           break;
2128         }
2129     }
2130   return s;
2131 }
2132
2133 static u8 *
2134 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2135 {
2136   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2137   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2138   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2139   ip6_hop_by_hop_header_t *hbh0;
2140   ip6_hop_by_hop_option_t *opt0, *limit0;
2141   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2142
2143   u8 type0;
2144
2145   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2146
2147   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2148               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2149
2150   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2151   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2152
2153   while (opt0 < limit0)
2154     {
2155       type0 = opt0->type;
2156       switch (type0)
2157         {
2158         case 0:         /* Pad, just stop */
2159           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2160           break;
2161
2162         default:
2163           if (hm->trace[type0])
2164             {
2165               s = (*hm->trace[type0]) (s, opt0);
2166             }
2167           else
2168             {
2169               s =
2170                 format (s, "\n    unrecognized option %d length %d", type0,
2171                         opt0->length);
2172             }
2173           opt0 =
2174             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2175                                          sizeof (ip6_hop_by_hop_option_t));
2176           break;
2177         }
2178     }
2179   return s;
2180 }
2181
2182 always_inline u8
2183 ip6_scan_hbh_options (vlib_buffer_t * b0,
2184                       ip6_header_t * ip0,
2185                       ip6_hop_by_hop_header_t * hbh0,
2186                       ip6_hop_by_hop_option_t * opt0,
2187                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2188 {
2189   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2190   u8 type0;
2191   u8 error0 = 0;
2192
2193   while (opt0 < limit0)
2194     {
2195       type0 = opt0->type;
2196       switch (type0)
2197         {
2198         case 0:         /* Pad1 */
2199           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2200           continue;
2201         case 1:         /* PadN */
2202           break;
2203         default:
2204           if (hm->options[type0])
2205             {
2206               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2207                 {
2208                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2209                   return (error0);
2210                 }
2211             }
2212           else
2213             {
2214               /* Unrecognized mandatory option, check the two high order bits */
2215               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2216                 {
2217                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2218                   break;
2219                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2220                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2221                   *next0 = IP_LOOKUP_NEXT_DROP;
2222                   break;
2223                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2224                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2225                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2226                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2227                                                ICMP6_parameter_problem_unrecognized_option,
2228                                                (u8 *) opt0 - (u8 *) ip0);
2229                   break;
2230                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2231                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2232                   if (!ip6_address_is_multicast (&ip0->dst_address))
2233                     {
2234                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2235                       icmp6_error_set_vnet_buffer (b0,
2236                                                    ICMP6_parameter_problem,
2237                                                    ICMP6_parameter_problem_unrecognized_option,
2238                                                    (u8 *) opt0 - (u8 *) ip0);
2239                     }
2240                   else
2241                     {
2242                       *next0 = IP_LOOKUP_NEXT_DROP;
2243                     }
2244                   break;
2245                 }
2246               return (error0);
2247             }
2248         }
2249       opt0 =
2250         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2251                                      sizeof (ip6_hop_by_hop_option_t));
2252     }
2253   return (error0);
2254 }
2255
2256 /*
2257  * Process the Hop-by-Hop Options header
2258  */
2259 static uword
2260 ip6_hop_by_hop (vlib_main_t * vm,
2261                 vlib_node_runtime_t * node, vlib_frame_t * frame)
2262 {
2263   vlib_node_runtime_t *error_node =
2264     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2265   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2266   u32 n_left_from, *from, *to_next;
2267   ip_lookup_next_t next_index;
2268
2269   from = vlib_frame_vector_args (frame);
2270   n_left_from = frame->n_vectors;
2271   next_index = node->cached_next_index;
2272
2273   while (n_left_from > 0)
2274     {
2275       u32 n_left_to_next;
2276
2277       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2278
2279       while (n_left_from >= 4 && n_left_to_next >= 2)
2280         {
2281           u32 bi0, bi1;
2282           vlib_buffer_t *b0, *b1;
2283           u32 next0, next1;
2284           ip6_header_t *ip0, *ip1;
2285           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2286           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2287           u8 error0 = 0, error1 = 0;
2288
2289           /* Prefetch next iteration. */
2290           {
2291             vlib_buffer_t *p2, *p3;
2292
2293             p2 = vlib_get_buffer (vm, from[2]);
2294             p3 = vlib_get_buffer (vm, from[3]);
2295
2296             vlib_prefetch_buffer_header (p2, LOAD);
2297             vlib_prefetch_buffer_header (p3, LOAD);
2298
2299             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2300             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2301           }
2302
2303           /* Speculatively enqueue b0, b1 to the current next frame */
2304           to_next[0] = bi0 = from[0];
2305           to_next[1] = bi1 = from[1];
2306           from += 2;
2307           to_next += 2;
2308           n_left_from -= 2;
2309           n_left_to_next -= 2;
2310
2311           b0 = vlib_get_buffer (vm, bi0);
2312           b1 = vlib_get_buffer (vm, bi1);
2313
2314           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2315           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2316           ip_adjacency_t *adj0 = adj_get (adj_index0);
2317           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2318           ip_adjacency_t *adj1 = adj_get (adj_index1);
2319
2320           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2321           next0 = adj0->lookup_next_index;
2322           next1 = adj1->lookup_next_index;
2323
2324           ip0 = vlib_buffer_get_current (b0);
2325           ip1 = vlib_buffer_get_current (b1);
2326           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2327           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2328           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2329           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2330           limit0 =
2331             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2332                                          ((hbh0->length + 1) << 3));
2333           limit1 =
2334             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2335                                          ((hbh1->length + 1) << 3));
2336
2337           /*
2338            * Basic validity checks
2339            */
2340           if ((hbh0->length + 1) << 3 >
2341               clib_net_to_host_u16 (ip0->payload_length))
2342             {
2343               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2344               next0 = IP_LOOKUP_NEXT_DROP;
2345               goto outdual;
2346             }
2347           /* Scan the set of h-b-h options, process ones that we understand */
2348           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2349
2350           if ((hbh1->length + 1) << 3 >
2351               clib_net_to_host_u16 (ip1->payload_length))
2352             {
2353               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2354               next1 = IP_LOOKUP_NEXT_DROP;
2355               goto outdual;
2356             }
2357           /* Scan the set of h-b-h options, process ones that we understand */
2358           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2359
2360         outdual:
2361           /* Has the classifier flagged this buffer for special treatment? */
2362           if (PREDICT_FALSE
2363               ((error0 == 0)
2364                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2365             next0 = hm->next_override;
2366
2367           /* Has the classifier flagged this buffer for special treatment? */
2368           if (PREDICT_FALSE
2369               ((error1 == 0)
2370                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2371             next1 = hm->next_override;
2372
2373           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2374             {
2375               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2376                 {
2377                   ip6_hop_by_hop_trace_t *t =
2378                     vlib_add_trace (vm, node, b0, sizeof (*t));
2379                   u32 trace_len = (hbh0->length + 1) << 3;
2380                   t->next_index = next0;
2381                   /* Capture the h-b-h option verbatim */
2382                   trace_len =
2383                     trace_len <
2384                     ARRAY_LEN (t->option_data) ? trace_len :
2385                     ARRAY_LEN (t->option_data);
2386                   t->trace_len = trace_len;
2387                   clib_memcpy (t->option_data, hbh0, trace_len);
2388                 }
2389               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2390                 {
2391                   ip6_hop_by_hop_trace_t *t =
2392                     vlib_add_trace (vm, node, b1, sizeof (*t));
2393                   u32 trace_len = (hbh1->length + 1) << 3;
2394                   t->next_index = next1;
2395                   /* Capture the h-b-h option verbatim */
2396                   trace_len =
2397                     trace_len <
2398                     ARRAY_LEN (t->option_data) ? trace_len :
2399                     ARRAY_LEN (t->option_data);
2400                   t->trace_len = trace_len;
2401                   clib_memcpy (t->option_data, hbh1, trace_len);
2402                 }
2403
2404             }
2405
2406           b0->error = error_node->errors[error0];
2407           b1->error = error_node->errors[error1];
2408
2409           /* verify speculative enqueue, maybe switch current next frame */
2410           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2411                                            n_left_to_next, bi0, bi1, next0,
2412                                            next1);
2413         }
2414
2415       while (n_left_from > 0 && n_left_to_next > 0)
2416         {
2417           u32 bi0;
2418           vlib_buffer_t *b0;
2419           u32 next0;
2420           ip6_header_t *ip0;
2421           ip6_hop_by_hop_header_t *hbh0;
2422           ip6_hop_by_hop_option_t *opt0, *limit0;
2423           u8 error0 = 0;
2424
2425           /* Speculatively enqueue b0 to the current next frame */
2426           bi0 = from[0];
2427           to_next[0] = bi0;
2428           from += 1;
2429           to_next += 1;
2430           n_left_from -= 1;
2431           n_left_to_next -= 1;
2432
2433           b0 = vlib_get_buffer (vm, bi0);
2434           /*
2435            * Default use the next_index from the adjacency.
2436            * A HBH option rarely redirects to a different node
2437            */
2438           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2439           ip_adjacency_t *adj0 = adj_get (adj_index0);
2440           next0 = adj0->lookup_next_index;
2441
2442           ip0 = vlib_buffer_get_current (b0);
2443           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2444           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2445           limit0 =
2446             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2447                                          ((hbh0->length + 1) << 3));
2448
2449           /*
2450            * Basic validity checks
2451            */
2452           if ((hbh0->length + 1) << 3 >
2453               clib_net_to_host_u16 (ip0->payload_length))
2454             {
2455               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2456               next0 = IP_LOOKUP_NEXT_DROP;
2457               goto out0;
2458             }
2459
2460           /* Scan the set of h-b-h options, process ones that we understand */
2461           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2462
2463         out0:
2464           /* Has the classifier flagged this buffer for special treatment? */
2465           if (PREDICT_FALSE
2466               ((error0 == 0)
2467                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2468             next0 = hm->next_override;
2469
2470           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2471             {
2472               ip6_hop_by_hop_trace_t *t =
2473                 vlib_add_trace (vm, node, b0, sizeof (*t));
2474               u32 trace_len = (hbh0->length + 1) << 3;
2475               t->next_index = next0;
2476               /* Capture the h-b-h option verbatim */
2477               trace_len =
2478                 trace_len <
2479                 ARRAY_LEN (t->option_data) ? trace_len :
2480                 ARRAY_LEN (t->option_data);
2481               t->trace_len = trace_len;
2482               clib_memcpy (t->option_data, hbh0, trace_len);
2483             }
2484
2485           b0->error = error_node->errors[error0];
2486
2487           /* verify speculative enqueue, maybe switch current next frame */
2488           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2489                                            n_left_to_next, bi0, next0);
2490         }
2491       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2492     }
2493   return frame->n_vectors;
2494 }
2495
2496 /* *INDENT-OFF* */
2497 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2498 {
2499   .function = ip6_hop_by_hop,
2500   .name = "ip6-hop-by-hop",
2501   .sibling_of = "ip6-lookup",
2502   .vector_size = sizeof (u32),
2503   .format_trace = format_ip6_hop_by_hop_trace,
2504   .type = VLIB_NODE_TYPE_INTERNAL,
2505   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2506   .error_strings = ip6_hop_by_hop_error_strings,
2507   .n_next_nodes = 0,
2508 };
2509 /* *INDENT-ON* */
2510
2511 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
2512
2513 static clib_error_t *
2514 ip6_hop_by_hop_init (vlib_main_t * vm)
2515 {
2516   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2517   clib_memset (hm->options, 0, sizeof (hm->options));
2518   clib_memset (hm->trace, 0, sizeof (hm->trace));
2519   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2520   return (0);
2521 }
2522
2523 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2524
2525 void
2526 ip6_hbh_set_next_override (uword next)
2527 {
2528   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2529
2530   hm->next_override = next;
2531 }
2532
2533 int
2534 ip6_hbh_register_option (u8 option,
2535                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2536                                       ip6_hop_by_hop_option_t * opt),
2537                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2538 {
2539   ip6_main_t *im = &ip6_main;
2540   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2541
2542   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2543
2544   /* Already registered */
2545   if (hm->options[option])
2546     return (-1);
2547
2548   hm->options[option] = options;
2549   hm->trace[option] = trace;
2550
2551   /* Set global variable */
2552   im->hbh_enabled = 1;
2553
2554   return (0);
2555 }
2556
2557 int
2558 ip6_hbh_unregister_option (u8 option)
2559 {
2560   ip6_main_t *im = &ip6_main;
2561   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2562
2563   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2564
2565   /* Not registered */
2566   if (!hm->options[option])
2567     return (-1);
2568
2569   hm->options[option] = NULL;
2570   hm->trace[option] = NULL;
2571
2572   /* Disable global knob if this was the last option configured */
2573   int i;
2574   bool found = false;
2575   for (i = 0; i < 256; i++)
2576     {
2577       if (hm->options[option])
2578         {
2579           found = true;
2580           break;
2581         }
2582     }
2583   if (!found)
2584     im->hbh_enabled = 0;
2585
2586   return (0);
2587 }
2588
2589 /* Global IP6 main. */
2590 ip6_main_t ip6_main;
2591
2592 static clib_error_t *
2593 ip6_lookup_init (vlib_main_t * vm)
2594 {
2595   ip6_main_t *im = &ip6_main;
2596   clib_error_t *error;
2597   uword i;
2598
2599   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2600     return error;
2601
2602   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2603     {
2604       u32 j, i0, i1;
2605
2606       i0 = i / 32;
2607       i1 = i % 32;
2608
2609       for (j = 0; j < i0; j++)
2610         im->fib_masks[i].as_u32[j] = ~0;
2611
2612       if (i1)
2613         im->fib_masks[i].as_u32[i0] =
2614           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2615     }
2616
2617   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2618
2619   if (im->lookup_table_nbuckets == 0)
2620     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2621
2622   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2623
2624   if (im->lookup_table_size == 0)
2625     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2626
2627   BV (clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2628                          "ip6 FIB fwding table",
2629                          im->lookup_table_nbuckets, im->lookup_table_size);
2630   BV (clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2631                          "ip6 FIB non-fwding table",
2632                          im->lookup_table_nbuckets, im->lookup_table_size);
2633
2634   /* Create FIB with index 0 and table id of 0. */
2635   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2636                                      FIB_SOURCE_DEFAULT_ROUTE);
2637   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2638                                       MFIB_SOURCE_DEFAULT_ROUTE);
2639
2640   {
2641     pg_node_t *pn;
2642     pn = pg_get_node (ip6_lookup_node.index);
2643     pn->unformat_edit = unformat_pg_ip6_header;
2644   }
2645
2646   /* Unless explicitly configured, don't process HBH options */
2647   im->hbh_enabled = 0;
2648
2649   {
2650     icmp6_neighbor_solicitation_header_t p;
2651
2652     clib_memset (&p, 0, sizeof (p));
2653
2654     p.ip.ip_version_traffic_class_and_flow_label =
2655       clib_host_to_net_u32 (0x6 << 28);
2656     p.ip.payload_length =
2657       clib_host_to_net_u16 (sizeof (p) -
2658                             STRUCT_OFFSET_OF
2659                             (icmp6_neighbor_solicitation_header_t, neighbor));
2660     p.ip.protocol = IP_PROTOCOL_ICMP6;
2661     p.ip.hop_limit = 255;
2662     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2663
2664     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2665
2666     p.link_layer_option.header.type =
2667       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2668     p.link_layer_option.header.n_data_u64s =
2669       sizeof (p.link_layer_option) / sizeof (u64);
2670
2671     vlib_packet_template_init (vm,
2672                                &im->discover_neighbor_packet_template,
2673                                &p, sizeof (p),
2674                                /* alloc chunk size */ 8,
2675                                "ip6 neighbor discovery");
2676   }
2677
2678   return error;
2679 }
2680
2681 VLIB_INIT_FUNCTION (ip6_lookup_init);
2682
2683 void
2684 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip,
2685                                                   u8 * mac)
2686 {
2687   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2688   /* Invert the "u" bit */
2689   ip->as_u8[8] = mac[0] ^ (1 << 1);
2690   ip->as_u8[9] = mac[1];
2691   ip->as_u8[10] = mac[2];
2692   ip->as_u8[11] = 0xFF;
2693   ip->as_u8[12] = 0xFE;
2694   ip->as_u8[13] = mac[3];
2695   ip->as_u8[14] = mac[4];
2696   ip->as_u8[15] = mac[5];
2697 }
2698
2699 void
2700 ip6_ethernet_mac_address_from_link_local_address (u8 * mac,
2701                                                   ip6_address_t * ip)
2702 {
2703   /* Invert the previously inverted "u" bit */
2704   mac[0] = ip->as_u8[8] ^ (1 << 1);
2705   mac[1] = ip->as_u8[9];
2706   mac[2] = ip->as_u8[10];
2707   mac[3] = ip->as_u8[13];
2708   mac[4] = ip->as_u8[14];
2709   mac[5] = ip->as_u8[15];
2710 }
2711
2712 static clib_error_t *
2713 test_ip6_link_command_fn (vlib_main_t * vm,
2714                           unformat_input_t * input, vlib_cli_command_t * cmd)
2715 {
2716   u8 mac[6];
2717   ip6_address_t _a, *a = &_a;
2718
2719   if (unformat (input, "%U", unformat_ethernet_address, mac))
2720     {
2721       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2722       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2723       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2724       vlib_cli_output (vm, "Original MAC address: %U",
2725                        format_ethernet_address, mac);
2726     }
2727
2728   return 0;
2729 }
2730
2731 /*?
2732  * This command converts the given MAC Address into an IPv6 link-local
2733  * address.
2734  *
2735  * @cliexpar
2736  * Example of how to create an IPv6 link-local address:
2737  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2738  * Link local address: fe80::14d9:e0ff:fe91:7986
2739  * Original MAC address: 16:d9:e0:91:79:86
2740  * @cliexend
2741 ?*/
2742 /* *INDENT-OFF* */
2743 VLIB_CLI_COMMAND (test_link_command, static) =
2744 {
2745   .path = "test ip6 link",
2746   .function = test_ip6_link_command_fn,
2747   .short_help = "test ip6 link <mac-address>",
2748 };
2749 /* *INDENT-ON* */
2750
2751 int
2752 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2753 {
2754   u32 fib_index;
2755
2756   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2757
2758   if (~0 == fib_index)
2759     return VNET_API_ERROR_NO_SUCH_FIB;
2760
2761   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2762                                   flow_hash_config);
2763
2764   return 0;
2765 }
2766
2767 static clib_error_t *
2768 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2769                               unformat_input_t * input,
2770                               vlib_cli_command_t * cmd)
2771 {
2772   int matched = 0;
2773   u32 table_id = 0;
2774   u32 flow_hash_config = 0;
2775   int rv;
2776
2777   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2778     {
2779       if (unformat (input, "table %d", &table_id))
2780         matched = 1;
2781 #define _(a,v) \
2782     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2783       foreach_flow_hash_bit
2784 #undef _
2785         else
2786         break;
2787     }
2788
2789   if (matched == 0)
2790     return clib_error_return (0, "unknown input `%U'",
2791                               format_unformat_error, input);
2792
2793   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2794   switch (rv)
2795     {
2796     case 0:
2797       break;
2798
2799     case -1:
2800       return clib_error_return (0, "no such FIB table %d", table_id);
2801
2802     default:
2803       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2804       break;
2805     }
2806
2807   return 0;
2808 }
2809
2810 /*?
2811  * Configure the set of IPv6 fields used by the flow hash.
2812  *
2813  * @cliexpar
2814  * @parblock
2815  * Example of how to set the flow hash on a given table:
2816  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2817  *
2818  * Example of display the configured flow hash:
2819  * @cliexstart{show ip6 fib}
2820  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2821  * @::/0
2822  *   unicast-ip6-chain
2823  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2824  *     [0] [@0]: dpo-drop ip6
2825  * fe80::/10
2826  *   unicast-ip6-chain
2827  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2828  *     [0] [@2]: dpo-receive
2829  * ff02::1/128
2830  *   unicast-ip6-chain
2831  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2832  *     [0] [@2]: dpo-receive
2833  * ff02::2/128
2834  *   unicast-ip6-chain
2835  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2836  *     [0] [@2]: dpo-receive
2837  * ff02::16/128
2838  *   unicast-ip6-chain
2839  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2840  *     [0] [@2]: dpo-receive
2841  * ff02::1:ff00:0/104
2842  *   unicast-ip6-chain
2843  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2844  *     [0] [@2]: dpo-receive
2845  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2846  * @::/0
2847  *   unicast-ip6-chain
2848  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2849  *     [0] [@0]: dpo-drop ip6
2850  * @::a:1:1:0:4/126
2851  *   unicast-ip6-chain
2852  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2853  *     [0] [@4]: ipv6-glean: af_packet0
2854  * @::a:1:1:0:7/128
2855  *   unicast-ip6-chain
2856  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2857  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2858  * fe80::/10
2859  *   unicast-ip6-chain
2860  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2861  *     [0] [@2]: dpo-receive
2862  * fe80::fe:3eff:fe3e:9222/128
2863  *   unicast-ip6-chain
2864  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2865  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2866  * ff02::1/128
2867  *   unicast-ip6-chain
2868  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2869  *     [0] [@2]: dpo-receive
2870  * ff02::2/128
2871  *   unicast-ip6-chain
2872  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2873  *     [0] [@2]: dpo-receive
2874  * ff02::16/128
2875  *   unicast-ip6-chain
2876  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2877  *     [0] [@2]: dpo-receive
2878  * ff02::1:ff00:0/104
2879  *   unicast-ip6-chain
2880  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2881  *     [0] [@2]: dpo-receive
2882  * @cliexend
2883  * @endparblock
2884 ?*/
2885 /* *INDENT-OFF* */
2886 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2887 {
2888   .path = "set ip6 flow-hash",
2889   .short_help =
2890   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2891   .function = set_ip6_flow_hash_command_fn,
2892 };
2893 /* *INDENT-ON* */
2894
2895 static clib_error_t *
2896 show_ip6_local_command_fn (vlib_main_t * vm,
2897                            unformat_input_t * input, vlib_cli_command_t * cmd)
2898 {
2899   ip6_main_t *im = &ip6_main;
2900   ip_lookup_main_t *lm = &im->lookup_main;
2901   int i;
2902
2903   vlib_cli_output (vm, "Protocols handled by ip6_local");
2904   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2905     {
2906       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2907         {
2908
2909           u32 node_index = vlib_get_node (vm,
2910                                           ip6_local_node.index)->
2911             next_nodes[lm->local_next_by_ip_protocol[i]];
2912           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2913                            node_index);
2914         }
2915     }
2916   return 0;
2917 }
2918
2919
2920
2921 /*?
2922  * Display the set of protocols handled by the local IPv6 stack.
2923  *
2924  * @cliexpar
2925  * Example of how to display local protocol table:
2926  * @cliexstart{show ip6 local}
2927  * Protocols handled by ip6_local
2928  * 17
2929  * 43
2930  * 58
2931  * 115
2932  * @cliexend
2933 ?*/
2934 /* *INDENT-OFF* */
2935 VLIB_CLI_COMMAND (show_ip6_local, static) =
2936 {
2937   .path = "show ip6 local",
2938   .function = show_ip6_local_command_fn,
2939   .short_help = "show ip6 local",
2940 };
2941 /* *INDENT-ON* */
2942
2943 int
2944 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2945                              u32 table_index)
2946 {
2947   vnet_main_t *vnm = vnet_get_main ();
2948   vnet_interface_main_t *im = &vnm->interface_main;
2949   ip6_main_t *ipm = &ip6_main;
2950   ip_lookup_main_t *lm = &ipm->lookup_main;
2951   vnet_classify_main_t *cm = &vnet_classify_main;
2952   ip6_address_t *if_addr;
2953
2954   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2955     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2956
2957   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2958     return VNET_API_ERROR_NO_SUCH_ENTRY;
2959
2960   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2961   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2962
2963   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2964
2965   if (NULL != if_addr)
2966     {
2967       fib_prefix_t pfx = {
2968         .fp_len = 128,
2969         .fp_proto = FIB_PROTOCOL_IP6,
2970         .fp_addr.ip6 = *if_addr,
2971       };
2972       u32 fib_index;
2973
2974       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2975                                                        sw_if_index);
2976
2977
2978       if (table_index != (u32) ~ 0)
2979         {
2980           dpo_id_t dpo = DPO_INVALID;
2981
2982           dpo_set (&dpo,
2983                    DPO_CLASSIFY,
2984                    DPO_PROTO_IP6,
2985                    classify_dpo_create (DPO_PROTO_IP6, table_index));
2986
2987           fib_table_entry_special_dpo_add (fib_index,
2988                                            &pfx,
2989                                            FIB_SOURCE_CLASSIFY,
2990                                            FIB_ENTRY_FLAG_NONE, &dpo);
2991           dpo_reset (&dpo);
2992         }
2993       else
2994         {
2995           fib_table_entry_special_remove (fib_index,
2996                                           &pfx, FIB_SOURCE_CLASSIFY);
2997         }
2998     }
2999
3000   return 0;
3001 }
3002
3003 static clib_error_t *
3004 set_ip6_classify_command_fn (vlib_main_t * vm,
3005                              unformat_input_t * input,
3006                              vlib_cli_command_t * cmd)
3007 {
3008   u32 table_index = ~0;
3009   int table_index_set = 0;
3010   u32 sw_if_index = ~0;
3011   int rv;
3012
3013   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3014     {
3015       if (unformat (input, "table-index %d", &table_index))
3016         table_index_set = 1;
3017       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3018                          vnet_get_main (), &sw_if_index))
3019         ;
3020       else
3021         break;
3022     }
3023
3024   if (table_index_set == 0)
3025     return clib_error_return (0, "classify table-index must be specified");
3026
3027   if (sw_if_index == ~0)
3028     return clib_error_return (0, "interface / subif must be specified");
3029
3030   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3031
3032   switch (rv)
3033     {
3034     case 0:
3035       break;
3036
3037     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3038       return clib_error_return (0, "No such interface");
3039
3040     case VNET_API_ERROR_NO_SUCH_ENTRY:
3041       return clib_error_return (0, "No such classifier table");
3042     }
3043   return 0;
3044 }
3045
3046 /*?
3047  * Assign a classification table to an interface. The classification
3048  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3049  * commands. Once the table is create, use this command to filter packets
3050  * on an interface.
3051  *
3052  * @cliexpar
3053  * Example of how to assign a classification table to an interface:
3054  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3055 ?*/
3056 /* *INDENT-OFF* */
3057 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3058 {
3059   .path = "set ip6 classify",
3060   .short_help =
3061   "set ip6 classify intfc <interface> table-index <classify-idx>",
3062   .function = set_ip6_classify_command_fn,
3063 };
3064 /* *INDENT-ON* */
3065
3066 static clib_error_t *
3067 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3068 {
3069   ip6_main_t *im = &ip6_main;
3070   uword heapsize = 0;
3071   u32 tmp;
3072   u32 nbuckets = 0;
3073
3074   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3075     {
3076       if (unformat (input, "hash-buckets %d", &tmp))
3077         nbuckets = tmp;
3078       else if (unformat (input, "heap-size %U",
3079                          unformat_memory_size, &heapsize))
3080         ;
3081       else
3082         return clib_error_return (0, "unknown input '%U'",
3083                                   format_unformat_error, input);
3084     }
3085
3086   im->lookup_table_nbuckets = nbuckets;
3087   im->lookup_table_size = heapsize;
3088
3089   return 0;
3090 }
3091
3092 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3093
3094 /*
3095  * fd.io coding-style-patch-verification: ON
3096  *
3097  * Local Variables:
3098  * eval: (c-set-style "gnu")
3099  * End:
3100  */