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 ("ipsec-input-ip6"),
 365 };
 366
 367 VNET_FEATURE_INIT (ip6_ipsec, static) =
 368 {
 369   .arc_name = "ip6-unicast",
 370   .node_name = "ipsec-input-ip6",
 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 ("ipsec-output-ip6"),
 447 };
 448
 449 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 450   .arc_name = "ip6-output",
 451   .node_name = "ipsec-output-ip6",
 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   if (node->flags & VLIB_NODE_FLAG_TRACE)
 540     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 541
 542   while (n_left_from > 0)
 543     {
 544       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 545
 546
 547       while (n_left_from >= 4 && n_left_to_next >= 2)
 548         {
 549           ip_lookup_next_t next0, next1;
 550           const load_balance_t *lb0, *lb1;
 551           vlib_buffer_t *p0, *p1;
 552           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 553           const ip6_header_t *ip0, *ip1;
 554           const dpo_id_t *dpo0, *dpo1;
 555
 556           /* Prefetch next iteration. */
 557           {
 558             vlib_buffer_t *p2, *p3;
 559
 560             p2 = vlib_get_buffer (vm, from[2]);
 561             p3 = vlib_get_buffer (vm, from[3]);
 562
 563             vlib_prefetch_buffer_header (p2, STORE);
 564             vlib_prefetch_buffer_header (p3, STORE);
 565
 566             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 567             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 568           }
 569
 570           pi0 = to_next[0] = from[0];
 571           pi1 = to_next[1] = from[1];
 572
 573           from += 2;
 574           n_left_from -= 2;
 575           to_next += 2;
 576           n_left_to_next -= 2;
 577
 578           p0 = vlib_get_buffer (vm, pi0);
 579           p1 = vlib_get_buffer (vm, pi1);
 580
 581           ip0 = vlib_buffer_get_current (p0);
 582           ip1 = vlib_buffer_get_current (p1);
 583           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 584           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 585
 586           lb0 = load_balance_get (lbi0);
 587           lb1 = load_balance_get (lbi1);
 588
 589           /*
 590            * this node is for via FIBs we can re-use the hash value from the
 591            * to node if present.
 592            * We don't want to use the same hash value at each level in the recursion
 593            * graph as that would lead to polarisation
 594            */
 595           hc0 = hc1 = 0;
 596
 597           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 598             {
 599               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 600                 {
 601                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 602                     vnet_buffer (p0)->ip.flow_hash >> 1;
 603                 }
 604               else
 605                 {
 606                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 607                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 608                 }
 609               dpo0 =
 610                 load_balance_get_fwd_bucket (lb0,
 611                                              (hc0 &
 612                                               lb0->lb_n_buckets_minus_1));
 613             }
 614           else
 615             {
 616               dpo0 = load_balance_get_bucket_i (lb0, 0);
 617             }
 618           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 619             {
 620               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 621                 {
 622                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 623                     vnet_buffer (p1)->ip.flow_hash >> 1;
 624                 }
 625               else
 626                 {
 627                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 628                     ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 629                 }
 630               dpo1 =
 631                 load_balance_get_fwd_bucket (lb1,
 632                                              (hc1 &
 633                                               lb1->lb_n_buckets_minus_1));
 634             }
 635           else
 636             {
 637               dpo1 = load_balance_get_bucket_i (lb1, 0);
 638             }
 639
 640           next0 = dpo0->dpoi_next_node;
 641           next1 = dpo1->dpoi_next_node;
 642
 643           /* Only process the HBH Option Header if explicitly configured to do so */
 644           if (PREDICT_FALSE
 645               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 646             {
 647               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 648                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 649             }
 650           /* Only process the HBH Option Header if explicitly configured to do so */
 651           if (PREDICT_FALSE
 652               (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 653             {
 654               next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 655                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 656             }
 657
 658           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 659           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 660
 661           vlib_increment_combined_counter
 662             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 663           vlib_increment_combined_counter
 664             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 665
 666           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 667                                            to_next, n_left_to_next,
 668                                            pi0, pi1, next0, next1);
 669         }
 670
 671       while (n_left_from > 0 && n_left_to_next > 0)
 672         {
 673           ip_lookup_next_t next0;
 674           const load_balance_t *lb0;
 675           vlib_buffer_t *p0;
 676           u32 pi0, lbi0, hc0;
 677           const ip6_header_t *ip0;
 678           const dpo_id_t *dpo0;
 679
 680           pi0 = from[0];
 681           to_next[0] = pi0;
 682           from += 1;
 683           to_next += 1;
 684           n_left_to_next -= 1;
 685           n_left_from -= 1;
 686
 687           p0 = vlib_get_buffer (vm, pi0);
 688
 689           ip0 = vlib_buffer_get_current (p0);
 690           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 691
 692           lb0 = load_balance_get (lbi0);
 693
 694           hc0 = 0;
 695           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 696             {
 697               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 698                 {
 699                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 700                     vnet_buffer (p0)->ip.flow_hash >> 1;
 701                 }
 702               else
 703                 {
 704                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 705                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 706                 }
 707               dpo0 =
 708                 load_balance_get_fwd_bucket (lb0,
 709                                              (hc0 &
 710                                               lb0->lb_n_buckets_minus_1));
 711             }
 712           else
 713             {
 714               dpo0 = load_balance_get_bucket_i (lb0, 0);
 715             }
 716
 717           next0 = dpo0->dpoi_next_node;
 718           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 719
 720           /* Only process the HBH Option Header if explicitly configured to do so */
 721           if (PREDICT_FALSE
 722               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 723             {
 724               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 725                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 726             }
 727
 728           vlib_increment_combined_counter
 729             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 730
 731           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 732                                            to_next, n_left_to_next,
 733                                            pi0, next0);
 734         }
 735
 736       vlib_put_next_frame (vm, node, next, n_left_to_next);
 737     }
 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   },
1393 };
1394 /* *INDENT-ON* */
1395
1396 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local);
1397
1398
1399 static uword
1400 ip6_local_end_of_arc (vlib_main_t * vm,
1401                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1402 {
1403   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1404 }
1405
1406 /* *INDENT-OFF* */
1407 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node,static) = {
1408   .function = ip6_local_end_of_arc,
1409   .name = "ip6-local-end-of-arc",
1410   .vector_size = sizeof (u32),
1411
1412   .format_trace = format_ip6_forward_next_trace,
1413   .sibling_of = "ip6-local",
1414 };
1415
1416 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_end_of_arc_node, ip6_local_end_of_arc)
1417
1418 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1419   .arc_name = "ip6-local",
1420   .node_name = "ip6-local-end-of-arc",
1421   .runs_before = 0, /* not before any other features */
1422 };
1423 /* *INDENT-ON* */
1424
1425 void
1426 ip6_register_protocol (u32 protocol, u32 node_index)
1427 {
1428   vlib_main_t *vm = vlib_get_main ();
1429   ip6_main_t *im = &ip6_main;
1430   ip_lookup_main_t *lm = &im->lookup_main;
1431
1432   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1433   lm->local_next_by_ip_protocol[protocol] =
1434     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1435 }
1436
1437 clib_error_t *
1438 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1439                     u8 refresh)
1440 {
1441   vnet_main_t *vnm = vnet_get_main ();
1442   ip6_main_t *im = &ip6_main;
1443   icmp6_neighbor_solicitation_header_t *h;
1444   ip6_address_t *src;
1445   ip_interface_address_t *ia;
1446   ip_adjacency_t *adj;
1447   vnet_hw_interface_t *hi;
1448   vnet_sw_interface_t *si;
1449   vlib_buffer_t *b;
1450   adj_index_t ai;
1451   u32 bi = 0;
1452   int bogus_length;
1453
1454   si = vnet_get_sw_interface (vnm, sw_if_index);
1455
1456   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1457     {
1458       return clib_error_return (0, "%U: interface %U down",
1459                                 format_ip6_address, dst,
1460                                 format_vnet_sw_if_index_name, vnm,
1461                                 sw_if_index);
1462     }
1463
1464   src =
1465     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1466   if (!src)
1467     {
1468       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1469       return clib_error_return
1470         (0, "no matching interface address for destination %U (interface %U)",
1471          format_ip6_address, dst,
1472          format_vnet_sw_if_index_name, vnm, sw_if_index);
1473     }
1474
1475   h =
1476     vlib_packet_template_get_packet (vm,
1477                                      &im->discover_neighbor_packet_template,
1478                                      &bi);
1479   if (!h)
1480     return clib_error_return (0, "ICMP6 NS packet allocation failed");
1481
1482   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1483
1484   /* Destination address is a solicited node multicast address.  We need to fill in
1485      the low 24 bits with low 24 bits of target's address. */
1486   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1487   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1488   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1489
1490   h->ip.src_address = src[0];
1491   h->neighbor.target_address = dst[0];
1492
1493   if (PREDICT_FALSE (!hi->hw_address))
1494     {
1495       return clib_error_return (0, "%U: interface %U do not support ip probe",
1496                                 format_ip6_address, dst,
1497                                 format_vnet_sw_if_index_name, vnm,
1498                                 sw_if_index);
1499     }
1500
1501   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address,
1502                vec_len (hi->hw_address));
1503
1504   h->neighbor.icmp.checksum =
1505     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1506   ASSERT (bogus_length == 0);
1507
1508   b = vlib_get_buffer (vm, bi);
1509   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1510     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1511
1512   /* Add encapsulation string for software interface (e.g. ethernet header). */
1513   ip46_address_t nh = {
1514     .ip6 = *dst,
1515   };
1516
1517   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1518                             VNET_LINK_IP6, &nh, sw_if_index);
1519   adj = adj_get (ai);
1520
1521   /* Peer has been previously resolved, retrieve glean adj instead */
1522   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1523     {
1524       adj_unlock (ai);
1525       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1526                                   VNET_LINK_IP6, sw_if_index, &nh);
1527       adj = adj_get (ai);
1528     }
1529
1530   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1531   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1532
1533   {
1534     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1535     u32 *to_next = vlib_frame_vector_args (f);
1536     to_next[0] = bi;
1537     f->n_vectors = 1;
1538     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1539   }
1540
1541   adj_unlock (ai);
1542   return /* no error */ 0;
1543 }
1544
1545 typedef enum
1546 {
1547   IP6_REWRITE_NEXT_DROP,
1548   IP6_REWRITE_NEXT_ICMP_ERROR,
1549   IP6_REWRITE_NEXT_FRAGMENT,
1550   IP6_REWRITE_N_NEXT            /* Last */
1551 } ip6_rewrite_next_t;
1552
1553 /**
1554  * This bits of an IPv6 address to mask to construct a multicast
1555  * MAC address
1556  */
1557 #define IP6_MCAST_ADDR_MASK 0xffffffff
1558
1559 always_inline void
1560 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1561                u16 adj_packet_bytes, bool is_locally_generated,
1562                u32 * next, u32 * error)
1563 {
1564   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1565     {
1566       if (is_locally_generated)
1567         {
1568           /* IP fragmentation */
1569           ip_frag_set_vnet_buffer (b, 0, adj_packet_bytes,
1570                                    IP6_FRAG_NEXT_IP6_LOOKUP, 0);
1571           *next = IP6_REWRITE_NEXT_FRAGMENT;
1572         }
1573       else
1574         {
1575           *error = IP6_ERROR_MTU_EXCEEDED;
1576           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1577                                        adj_packet_bytes);
1578           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1579         }
1580     }
1581 }
1582
1583 always_inline uword
1584 ip6_rewrite_inline (vlib_main_t * vm,
1585                     vlib_node_runtime_t * node,
1586                     vlib_frame_t * frame,
1587                     int do_counters, int is_midchain, int is_mcast)
1588 {
1589   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1590   u32 *from = vlib_frame_vector_args (frame);
1591   u32 n_left_from, n_left_to_next, *to_next, next_index;
1592   vlib_node_runtime_t *error_node =
1593     vlib_node_get_runtime (vm, ip6_input_node.index);
1594
1595   n_left_from = frame->n_vectors;
1596   next_index = node->cached_next_index;
1597   u32 thread_index = vm->thread_index;
1598
1599   while (n_left_from > 0)
1600     {
1601       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1602
1603       while (n_left_from >= 4 && n_left_to_next >= 2)
1604         {
1605           ip_adjacency_t *adj0, *adj1;
1606           vlib_buffer_t *p0, *p1;
1607           ip6_header_t *ip0, *ip1;
1608           u32 pi0, rw_len0, next0, error0, adj_index0;
1609           u32 pi1, rw_len1, next1, error1, adj_index1;
1610           u32 tx_sw_if_index0, tx_sw_if_index1;
1611           bool is_locally_originated0, is_locally_originated1;
1612
1613           /* Prefetch next iteration. */
1614           {
1615             vlib_buffer_t *p2, *p3;
1616
1617             p2 = vlib_get_buffer (vm, from[2]);
1618             p3 = vlib_get_buffer (vm, from[3]);
1619
1620             vlib_prefetch_buffer_header (p2, LOAD);
1621             vlib_prefetch_buffer_header (p3, LOAD);
1622
1623             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1624             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1625
1626             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1627             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1628           }
1629
1630           pi0 = to_next[0] = from[0];
1631           pi1 = to_next[1] = from[1];
1632
1633           from += 2;
1634           n_left_from -= 2;
1635           to_next += 2;
1636           n_left_to_next -= 2;
1637
1638           p0 = vlib_get_buffer (vm, pi0);
1639           p1 = vlib_get_buffer (vm, pi1);
1640
1641           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1642           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1643
1644           ip0 = vlib_buffer_get_current (p0);
1645           ip1 = vlib_buffer_get_current (p1);
1646
1647           error0 = error1 = IP6_ERROR_NONE;
1648           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1649
1650           is_locally_originated0 =
1651             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1652           if (PREDICT_TRUE (!is_locally_originated0))
1653             {
1654               i32 hop_limit0 = ip0->hop_limit;
1655
1656               /* Input node should have reject packets with hop limit 0. */
1657               ASSERT (ip0->hop_limit > 0);
1658
1659               hop_limit0 -= 1;
1660
1661               ip0->hop_limit = hop_limit0;
1662
1663               /*
1664                * If the hop count drops below 1 when forwarding, generate
1665                * an ICMP response.
1666                */
1667               if (PREDICT_FALSE (hop_limit0 <= 0))
1668                 {
1669                   error0 = IP6_ERROR_TIME_EXPIRED;
1670                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1671                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1672                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1673                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1674                                                0);
1675                 }
1676             }
1677           else
1678             {
1679               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1680             }
1681           is_locally_originated1 =
1682             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1683           if (PREDICT_TRUE (!is_locally_originated1))
1684             {
1685               i32 hop_limit1 = ip1->hop_limit;
1686
1687               /* Input node should have reject packets with hop limit 0. */
1688               ASSERT (ip1->hop_limit > 0);
1689
1690               hop_limit1 -= 1;
1691
1692               ip1->hop_limit = hop_limit1;
1693
1694               /*
1695                * If the hop count drops below 1 when forwarding, generate
1696                * an ICMP response.
1697                */
1698               if (PREDICT_FALSE (hop_limit1 <= 0))
1699                 {
1700                   error1 = IP6_ERROR_TIME_EXPIRED;
1701                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1702                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1703                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1704                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1705                                                0);
1706                 }
1707             }
1708           else
1709             {
1710               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1711             }
1712           adj0 = adj_get (adj_index0);
1713           adj1 = adj_get (adj_index1);
1714
1715           rw_len0 = adj0[0].rewrite_header.data_bytes;
1716           rw_len1 = adj1[0].rewrite_header.data_bytes;
1717           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1718           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1719
1720           if (do_counters)
1721             {
1722               vlib_increment_combined_counter
1723                 (&adjacency_counters,
1724                  thread_index, adj_index0, 1,
1725                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1726               vlib_increment_combined_counter
1727                 (&adjacency_counters,
1728                  thread_index, adj_index1, 1,
1729                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1730             }
1731
1732           /* Check MTU of outgoing interface. */
1733           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1734                          sizeof (ip6_header_t),
1735                          adj0[0].rewrite_header.max_l3_packet_bytes,
1736                          is_locally_originated0, &next0, &error0);
1737           ip6_mtu_check (p1, clib_net_to_host_u16 (ip1->payload_length) +
1738                          sizeof (ip6_header_t),
1739                          adj1[0].rewrite_header.max_l3_packet_bytes,
1740                          is_locally_originated1, &next1, &error1);
1741
1742           /* Don't adjust the buffer for hop count issue; icmp-error node
1743            * wants to see the IP headerr */
1744           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1745             {
1746               p0->current_data -= rw_len0;
1747               p0->current_length += rw_len0;
1748
1749               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1750               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1751               next0 = adj0[0].rewrite_header.next_index;
1752
1753               if (PREDICT_FALSE
1754                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1755                 vnet_feature_arc_start (lm->output_feature_arc_index,
1756                                         tx_sw_if_index0, &next0, p0);
1757             }
1758           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1759             {
1760               p1->current_data -= rw_len1;
1761               p1->current_length += rw_len1;
1762
1763               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1764               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1765               next1 = adj1[0].rewrite_header.next_index;
1766
1767               if (PREDICT_FALSE
1768                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1769                 vnet_feature_arc_start (lm->output_feature_arc_index,
1770                                         tx_sw_if_index1, &next1, p1);
1771             }
1772
1773           /* Guess we are only writing on simple Ethernet header. */
1774           vnet_rewrite_two_headers (adj0[0], adj1[0],
1775                                     ip0, ip1, sizeof (ethernet_header_t));
1776
1777           if (is_midchain)
1778             {
1779               adj0->sub_type.midchain.fixup_func
1780                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1781               adj1->sub_type.midchain.fixup_func
1782                 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1783             }
1784           if (is_mcast)
1785             {
1786               /*
1787                * copy bytes from the IP address into the MAC rewrite
1788                */
1789               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1790                                           adj0->
1791                                           rewrite_header.dst_mcast_offset,
1792                                           &ip0->dst_address.as_u32[3],
1793                                           (u8 *) ip0);
1794               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1795                                           adj1->
1796                                           rewrite_header.dst_mcast_offset,
1797                                           &ip1->dst_address.as_u32[3],
1798                                           (u8 *) ip1);
1799             }
1800
1801           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1802                                            to_next, n_left_to_next,
1803                                            pi0, pi1, next0, next1);
1804         }
1805
1806       while (n_left_from > 0 && n_left_to_next > 0)
1807         {
1808           ip_adjacency_t *adj0;
1809           vlib_buffer_t *p0;
1810           ip6_header_t *ip0;
1811           u32 pi0, rw_len0;
1812           u32 adj_index0, next0, error0;
1813           u32 tx_sw_if_index0;
1814           bool is_locally_originated0;
1815
1816           pi0 = to_next[0] = from[0];
1817
1818           p0 = vlib_get_buffer (vm, pi0);
1819
1820           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1821
1822           adj0 = adj_get (adj_index0);
1823
1824           ip0 = vlib_buffer_get_current (p0);
1825
1826           error0 = IP6_ERROR_NONE;
1827           next0 = IP6_REWRITE_NEXT_DROP;
1828
1829           /* Check hop limit */
1830           is_locally_originated0 =
1831             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1832           if (PREDICT_TRUE (!is_locally_originated0))
1833             {
1834               i32 hop_limit0 = ip0->hop_limit;
1835
1836               ASSERT (ip0->hop_limit > 0);
1837
1838               hop_limit0 -= 1;
1839
1840               ip0->hop_limit = hop_limit0;
1841
1842               if (PREDICT_FALSE (hop_limit0 <= 0))
1843                 {
1844                   /*
1845                    * If the hop count drops below 1 when forwarding, generate
1846                    * an ICMP response.
1847                    */
1848                   error0 = IP6_ERROR_TIME_EXPIRED;
1849                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1850                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1851                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1852                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1853                                                0);
1854                 }
1855             }
1856           else
1857             {
1858               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1859             }
1860
1861           /* Guess we are only writing on simple Ethernet header. */
1862           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1863
1864           /* Update packet buffer attributes/set output interface. */
1865           rw_len0 = adj0[0].rewrite_header.data_bytes;
1866           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1867
1868           if (do_counters)
1869             {
1870               vlib_increment_combined_counter
1871                 (&adjacency_counters,
1872                  thread_index, adj_index0, 1,
1873                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1874             }
1875
1876           /* Check MTU of outgoing interface. */
1877           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1878                          sizeof (ip6_header_t),
1879                          adj0[0].rewrite_header.max_l3_packet_bytes,
1880                          is_locally_originated0, &next0, &error0);
1881
1882           /* Don't adjust the buffer for hop count issue; icmp-error node
1883            * wants to see the IP header */
1884           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1885             {
1886               p0->current_data -= rw_len0;
1887               p0->current_length += rw_len0;
1888
1889               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1890
1891               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1892               next0 = adj0[0].rewrite_header.next_index;
1893
1894               if (PREDICT_FALSE
1895                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1896                 vnet_feature_arc_start (lm->output_feature_arc_index,
1897                                         tx_sw_if_index0, &next0, p0);
1898             }
1899
1900           if (is_midchain)
1901             {
1902               adj0->sub_type.midchain.fixup_func
1903                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1904             }
1905           if (is_mcast)
1906             {
1907               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1908                                           adj0->
1909                                           rewrite_header.dst_mcast_offset,
1910                                           &ip0->dst_address.as_u32[3],
1911                                           (u8 *) ip0);
1912             }
1913
1914           p0->error = error_node->errors[error0];
1915
1916           from += 1;
1917           n_left_from -= 1;
1918           to_next += 1;
1919           n_left_to_next -= 1;
1920
1921           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1922                                            to_next, n_left_to_next,
1923                                            pi0, next0);
1924         }
1925
1926       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1927     }
1928
1929   /* Need to do trace after rewrites to pick up new packet data. */
1930   if (node->flags & VLIB_NODE_FLAG_TRACE)
1931     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1932
1933   return frame->n_vectors;
1934 }
1935
1936 static uword
1937 ip6_rewrite (vlib_main_t * vm,
1938              vlib_node_runtime_t * node, vlib_frame_t * frame)
1939 {
1940   if (adj_are_counters_enabled ())
1941     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1942   else
1943     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1944 }
1945
1946 static uword
1947 ip6_rewrite_bcast (vlib_main_t * vm,
1948                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1949 {
1950   if (adj_are_counters_enabled ())
1951     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1952   else
1953     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1954 }
1955
1956 static uword
1957 ip6_rewrite_mcast (vlib_main_t * vm,
1958                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1959 {
1960   if (adj_are_counters_enabled ())
1961     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
1962   else
1963     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
1964 }
1965
1966 static uword
1967 ip6_midchain (vlib_main_t * vm,
1968               vlib_node_runtime_t * node, vlib_frame_t * frame)
1969 {
1970   if (adj_are_counters_enabled ())
1971     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
1972   else
1973     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
1974 }
1975
1976 static uword
1977 ip6_mcast_midchain (vlib_main_t * vm,
1978                     vlib_node_runtime_t * node, vlib_frame_t * frame)
1979 {
1980   if (adj_are_counters_enabled ())
1981     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
1982   else
1983     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
1984 }
1985
1986 /* *INDENT-OFF* */
1987 VLIB_REGISTER_NODE (ip6_midchain_node) =
1988 {
1989   .function = ip6_midchain,
1990   .name = "ip6-midchain",
1991   .vector_size = sizeof (u32),
1992   .format_trace = format_ip6_forward_next_trace,
1993   .sibling_of = "ip6-rewrite",
1994   };
1995
1996 VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain);
1997
1998 VLIB_REGISTER_NODE (ip6_rewrite_node) =
1999 {
2000   .function = ip6_rewrite,
2001   .name = "ip6-rewrite",
2002   .vector_size = sizeof (u32),
2003   .format_trace = format_ip6_rewrite_trace,
2004   .n_next_nodes = IP6_REWRITE_N_NEXT,
2005   .next_nodes =
2006   {
2007     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2008     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2009     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2010   },
2011 };
2012
2013 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite);
2014
2015 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2016   .function = ip6_rewrite,
2017   .name = "ip6-rewrite-bcast",
2018   .vector_size = sizeof (u32),
2019
2020   .format_trace = format_ip6_rewrite_trace,
2021   .sibling_of = "ip6-rewrite",
2022 };
2023 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_bcast_node, ip6_rewrite_bcast)
2024
2025 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2026 {
2027   .function = ip6_rewrite_mcast,
2028   .name = "ip6-rewrite-mcast",
2029   .vector_size = sizeof (u32),
2030   .format_trace = format_ip6_rewrite_trace,
2031   .sibling_of = "ip6-rewrite",
2032 };
2033
2034 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_mcast_node, ip6_rewrite_mcast);
2035
2036 VLIB_REGISTER_NODE (ip6_mcast_midchain_node, static) =
2037 {
2038   .function = ip6_mcast_midchain,
2039   .name = "ip6-mcast-midchain",
2040   .vector_size = sizeof (u32),
2041   .format_trace = format_ip6_rewrite_trace,
2042   .sibling_of = "ip6-rewrite",
2043 };
2044
2045 VLIB_NODE_FUNCTION_MULTIARCH (ip6_mcast_midchain_node, ip6_mcast_midchain);
2046 /* *INDENT-ON* */
2047
2048 /*
2049  * Hop-by-Hop handling
2050  */
2051 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2052
2053 #define foreach_ip6_hop_by_hop_error \
2054 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2055 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2056 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2057
2058 /* *INDENT-OFF* */
2059 typedef enum
2060 {
2061 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2062   foreach_ip6_hop_by_hop_error
2063 #undef _
2064   IP6_HOP_BY_HOP_N_ERROR,
2065 } ip6_hop_by_hop_error_t;
2066 /* *INDENT-ON* */
2067
2068 /*
2069  * Primary h-b-h handler trace support
2070  * We work pretty hard on the problem for obvious reasons
2071  */
2072 typedef struct
2073 {
2074   u32 next_index;
2075   u32 trace_len;
2076   u8 option_data[256];
2077 } ip6_hop_by_hop_trace_t;
2078
2079 vlib_node_registration_t ip6_hop_by_hop_node;
2080
2081 static char *ip6_hop_by_hop_error_strings[] = {
2082 #define _(sym,string) string,
2083   foreach_ip6_hop_by_hop_error
2084 #undef _
2085 };
2086
2087 u8 *
2088 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2089 {
2090   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2091   int total_len = va_arg (*args, int);
2092   ip6_hop_by_hop_option_t *opt0, *limit0;
2093   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2094   u8 type0;
2095
2096   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2097               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2098
2099   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2100   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2101
2102   while (opt0 < limit0)
2103     {
2104       type0 = opt0->type;
2105       switch (type0)
2106         {
2107         case 0:         /* Pad, just stop */
2108           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2109           break;
2110
2111         default:
2112           if (hm->trace[type0])
2113             {
2114               s = (*hm->trace[type0]) (s, opt0);
2115             }
2116           else
2117             {
2118               s =
2119                 format (s, "\n    unrecognized option %d length %d", type0,
2120                         opt0->length);
2121             }
2122           opt0 =
2123             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2124                                          sizeof (ip6_hop_by_hop_option_t));
2125           break;
2126         }
2127     }
2128   return s;
2129 }
2130
2131 static u8 *
2132 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2133 {
2134   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2135   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2136   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2137   ip6_hop_by_hop_header_t *hbh0;
2138   ip6_hop_by_hop_option_t *opt0, *limit0;
2139   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2140
2141   u8 type0;
2142
2143   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2144
2145   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2146               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2147
2148   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2149   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2150
2151   while (opt0 < limit0)
2152     {
2153       type0 = opt0->type;
2154       switch (type0)
2155         {
2156         case 0:         /* Pad, just stop */
2157           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2158           break;
2159
2160         default:
2161           if (hm->trace[type0])
2162             {
2163               s = (*hm->trace[type0]) (s, opt0);
2164             }
2165           else
2166             {
2167               s =
2168                 format (s, "\n    unrecognized option %d length %d", type0,
2169                         opt0->length);
2170             }
2171           opt0 =
2172             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2173                                          sizeof (ip6_hop_by_hop_option_t));
2174           break;
2175         }
2176     }
2177   return s;
2178 }
2179
2180 always_inline u8
2181 ip6_scan_hbh_options (vlib_buffer_t * b0,
2182                       ip6_header_t * ip0,
2183                       ip6_hop_by_hop_header_t * hbh0,
2184                       ip6_hop_by_hop_option_t * opt0,
2185                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2186 {
2187   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2188   u8 type0;
2189   u8 error0 = 0;
2190
2191   while (opt0 < limit0)
2192     {
2193       type0 = opt0->type;
2194       switch (type0)
2195         {
2196         case 0:         /* Pad1 */
2197           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2198           continue;
2199         case 1:         /* PadN */
2200           break;
2201         default:
2202           if (hm->options[type0])
2203             {
2204               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2205                 {
2206                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2207                   return (error0);
2208                 }
2209             }
2210           else
2211             {
2212               /* Unrecognized mandatory option, check the two high order bits */
2213               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2214                 {
2215                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2216                   break;
2217                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2218                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2219                   *next0 = IP_LOOKUP_NEXT_DROP;
2220                   break;
2221                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2222                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2223                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2224                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2225                                                ICMP6_parameter_problem_unrecognized_option,
2226                                                (u8 *) opt0 - (u8 *) ip0);
2227                   break;
2228                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2229                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2230                   if (!ip6_address_is_multicast (&ip0->dst_address))
2231                     {
2232                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2233                       icmp6_error_set_vnet_buffer (b0,
2234                                                    ICMP6_parameter_problem,
2235                                                    ICMP6_parameter_problem_unrecognized_option,
2236                                                    (u8 *) opt0 - (u8 *) ip0);
2237                     }
2238                   else
2239                     {
2240                       *next0 = IP_LOOKUP_NEXT_DROP;
2241                     }
2242                   break;
2243                 }
2244               return (error0);
2245             }
2246         }
2247       opt0 =
2248         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2249                                      sizeof (ip6_hop_by_hop_option_t));
2250     }
2251   return (error0);
2252 }
2253
2254 /*
2255  * Process the Hop-by-Hop Options header
2256  */
2257 static uword
2258 ip6_hop_by_hop (vlib_main_t * vm,
2259                 vlib_node_runtime_t * node, vlib_frame_t * frame)
2260 {
2261   vlib_node_runtime_t *error_node =
2262     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2263   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2264   u32 n_left_from, *from, *to_next;
2265   ip_lookup_next_t next_index;
2266
2267   from = vlib_frame_vector_args (frame);
2268   n_left_from = frame->n_vectors;
2269   next_index = node->cached_next_index;
2270
2271   while (n_left_from > 0)
2272     {
2273       u32 n_left_to_next;
2274
2275       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2276
2277       while (n_left_from >= 4 && n_left_to_next >= 2)
2278         {
2279           u32 bi0, bi1;
2280           vlib_buffer_t *b0, *b1;
2281           u32 next0, next1;
2282           ip6_header_t *ip0, *ip1;
2283           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2284           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2285           u8 error0 = 0, error1 = 0;
2286
2287           /* Prefetch next iteration. */
2288           {
2289             vlib_buffer_t *p2, *p3;
2290
2291             p2 = vlib_get_buffer (vm, from[2]);
2292             p3 = vlib_get_buffer (vm, from[3]);
2293
2294             vlib_prefetch_buffer_header (p2, LOAD);
2295             vlib_prefetch_buffer_header (p3, LOAD);
2296
2297             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2298             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2299           }
2300
2301           /* Speculatively enqueue b0, b1 to the current next frame */
2302           to_next[0] = bi0 = from[0];
2303           to_next[1] = bi1 = from[1];
2304           from += 2;
2305           to_next += 2;
2306           n_left_from -= 2;
2307           n_left_to_next -= 2;
2308
2309           b0 = vlib_get_buffer (vm, bi0);
2310           b1 = vlib_get_buffer (vm, bi1);
2311
2312           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2313           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2314           ip_adjacency_t *adj0 = adj_get (adj_index0);
2315           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2316           ip_adjacency_t *adj1 = adj_get (adj_index1);
2317
2318           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2319           next0 = adj0->lookup_next_index;
2320           next1 = adj1->lookup_next_index;
2321
2322           ip0 = vlib_buffer_get_current (b0);
2323           ip1 = vlib_buffer_get_current (b1);
2324           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2325           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2326           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2327           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2328           limit0 =
2329             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2330                                          ((hbh0->length + 1) << 3));
2331           limit1 =
2332             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2333                                          ((hbh1->length + 1) << 3));
2334
2335           /*
2336            * Basic validity checks
2337            */
2338           if ((hbh0->length + 1) << 3 >
2339               clib_net_to_host_u16 (ip0->payload_length))
2340             {
2341               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2342               next0 = IP_LOOKUP_NEXT_DROP;
2343               goto outdual;
2344             }
2345           /* Scan the set of h-b-h options, process ones that we understand */
2346           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2347
2348           if ((hbh1->length + 1) << 3 >
2349               clib_net_to_host_u16 (ip1->payload_length))
2350             {
2351               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2352               next1 = IP_LOOKUP_NEXT_DROP;
2353               goto outdual;
2354             }
2355           /* Scan the set of h-b-h options, process ones that we understand */
2356           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2357
2358         outdual:
2359           /* Has the classifier flagged this buffer for special treatment? */
2360           if (PREDICT_FALSE
2361               ((error0 == 0)
2362                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2363             next0 = hm->next_override;
2364
2365           /* Has the classifier flagged this buffer for special treatment? */
2366           if (PREDICT_FALSE
2367               ((error1 == 0)
2368                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2369             next1 = hm->next_override;
2370
2371           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2372             {
2373               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2374                 {
2375                   ip6_hop_by_hop_trace_t *t =
2376                     vlib_add_trace (vm, node, b0, sizeof (*t));
2377                   u32 trace_len = (hbh0->length + 1) << 3;
2378                   t->next_index = next0;
2379                   /* Capture the h-b-h option verbatim */
2380                   trace_len =
2381                     trace_len <
2382                     ARRAY_LEN (t->option_data) ? trace_len :
2383                     ARRAY_LEN (t->option_data);
2384                   t->trace_len = trace_len;
2385                   clib_memcpy (t->option_data, hbh0, trace_len);
2386                 }
2387               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2388                 {
2389                   ip6_hop_by_hop_trace_t *t =
2390                     vlib_add_trace (vm, node, b1, sizeof (*t));
2391                   u32 trace_len = (hbh1->length + 1) << 3;
2392                   t->next_index = next1;
2393                   /* Capture the h-b-h option verbatim */
2394                   trace_len =
2395                     trace_len <
2396                     ARRAY_LEN (t->option_data) ? trace_len :
2397                     ARRAY_LEN (t->option_data);
2398                   t->trace_len = trace_len;
2399                   clib_memcpy (t->option_data, hbh1, trace_len);
2400                 }
2401
2402             }
2403
2404           b0->error = error_node->errors[error0];
2405           b1->error = error_node->errors[error1];
2406
2407           /* verify speculative enqueue, maybe switch current next frame */
2408           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2409                                            n_left_to_next, bi0, bi1, next0,
2410                                            next1);
2411         }
2412
2413       while (n_left_from > 0 && n_left_to_next > 0)
2414         {
2415           u32 bi0;
2416           vlib_buffer_t *b0;
2417           u32 next0;
2418           ip6_header_t *ip0;
2419           ip6_hop_by_hop_header_t *hbh0;
2420           ip6_hop_by_hop_option_t *opt0, *limit0;
2421           u8 error0 = 0;
2422
2423           /* Speculatively enqueue b0 to the current next frame */
2424           bi0 = from[0];
2425           to_next[0] = bi0;
2426           from += 1;
2427           to_next += 1;
2428           n_left_from -= 1;
2429           n_left_to_next -= 1;
2430
2431           b0 = vlib_get_buffer (vm, bi0);
2432           /*
2433            * Default use the next_index from the adjacency.
2434            * A HBH option rarely redirects to a different node
2435            */
2436           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2437           ip_adjacency_t *adj0 = adj_get (adj_index0);
2438           next0 = adj0->lookup_next_index;
2439
2440           ip0 = vlib_buffer_get_current (b0);
2441           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2442           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2443           limit0 =
2444             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2445                                          ((hbh0->length + 1) << 3));
2446
2447           /*
2448            * Basic validity checks
2449            */
2450           if ((hbh0->length + 1) << 3 >
2451               clib_net_to_host_u16 (ip0->payload_length))
2452             {
2453               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2454               next0 = IP_LOOKUP_NEXT_DROP;
2455               goto out0;
2456             }
2457
2458           /* Scan the set of h-b-h options, process ones that we understand */
2459           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2460
2461         out0:
2462           /* Has the classifier flagged this buffer for special treatment? */
2463           if (PREDICT_FALSE
2464               ((error0 == 0)
2465                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2466             next0 = hm->next_override;
2467
2468           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2469             {
2470               ip6_hop_by_hop_trace_t *t =
2471                 vlib_add_trace (vm, node, b0, sizeof (*t));
2472               u32 trace_len = (hbh0->length + 1) << 3;
2473               t->next_index = next0;
2474               /* Capture the h-b-h option verbatim */
2475               trace_len =
2476                 trace_len <
2477                 ARRAY_LEN (t->option_data) ? trace_len :
2478                 ARRAY_LEN (t->option_data);
2479               t->trace_len = trace_len;
2480               clib_memcpy (t->option_data, hbh0, trace_len);
2481             }
2482
2483           b0->error = error_node->errors[error0];
2484
2485           /* verify speculative enqueue, maybe switch current next frame */
2486           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2487                                            n_left_to_next, bi0, next0);
2488         }
2489       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2490     }
2491   return frame->n_vectors;
2492 }
2493
2494 /* *INDENT-OFF* */
2495 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2496 {
2497   .function = ip6_hop_by_hop,
2498   .name = "ip6-hop-by-hop",
2499   .sibling_of = "ip6-lookup",
2500   .vector_size = sizeof (u32),
2501   .format_trace = format_ip6_hop_by_hop_trace,
2502   .type = VLIB_NODE_TYPE_INTERNAL,
2503   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2504   .error_strings = ip6_hop_by_hop_error_strings,
2505   .n_next_nodes = 0,
2506 };
2507 /* *INDENT-ON* */
2508
2509 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
2510
2511 static clib_error_t *
2512 ip6_hop_by_hop_init (vlib_main_t * vm)
2513 {
2514   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2515   memset (hm->options, 0, sizeof (hm->options));
2516   memset (hm->trace, 0, sizeof (hm->trace));
2517   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2518   return (0);
2519 }
2520
2521 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2522
2523 void
2524 ip6_hbh_set_next_override (uword next)
2525 {
2526   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2527
2528   hm->next_override = next;
2529 }
2530
2531 int
2532 ip6_hbh_register_option (u8 option,
2533                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2534                                       ip6_hop_by_hop_option_t * opt),
2535                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2536 {
2537   ip6_main_t *im = &ip6_main;
2538   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2539
2540   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2541
2542   /* Already registered */
2543   if (hm->options[option])
2544     return (-1);
2545
2546   hm->options[option] = options;
2547   hm->trace[option] = trace;
2548
2549   /* Set global variable */
2550   im->hbh_enabled = 1;
2551
2552   return (0);
2553 }
2554
2555 int
2556 ip6_hbh_unregister_option (u8 option)
2557 {
2558   ip6_main_t *im = &ip6_main;
2559   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2560
2561   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2562
2563   /* Not registered */
2564   if (!hm->options[option])
2565     return (-1);
2566
2567   hm->options[option] = NULL;
2568   hm->trace[option] = NULL;
2569
2570   /* Disable global knob if this was the last option configured */
2571   int i;
2572   bool found = false;
2573   for (i = 0; i < 256; i++)
2574     {
2575       if (hm->options[option])
2576         {
2577           found = true;
2578           break;
2579         }
2580     }
2581   if (!found)
2582     im->hbh_enabled = 0;
2583
2584   return (0);
2585 }
2586
2587 /* Global IP6 main. */
2588 ip6_main_t ip6_main;
2589
2590 static clib_error_t *
2591 ip6_lookup_init (vlib_main_t * vm)
2592 {
2593   ip6_main_t *im = &ip6_main;
2594   clib_error_t *error;
2595   uword i;
2596
2597   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2598     return error;
2599
2600   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2601     {
2602       u32 j, i0, i1;
2603
2604       i0 = i / 32;
2605       i1 = i % 32;
2606
2607       for (j = 0; j < i0; j++)
2608         im->fib_masks[i].as_u32[j] = ~0;
2609
2610       if (i1)
2611         im->fib_masks[i].as_u32[i0] =
2612           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2613     }
2614
2615   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2616
2617   if (im->lookup_table_nbuckets == 0)
2618     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2619
2620   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2621
2622   if (im->lookup_table_size == 0)
2623     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2624
2625   BV (clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2626                          "ip6 FIB fwding table",
2627                          im->lookup_table_nbuckets, im->lookup_table_size);
2628   BV (clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2629                          "ip6 FIB non-fwding table",
2630                          im->lookup_table_nbuckets, im->lookup_table_size);
2631
2632   /* Create FIB with index 0 and table id of 0. */
2633   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2634                                      FIB_SOURCE_DEFAULT_ROUTE);
2635   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2636                                       MFIB_SOURCE_DEFAULT_ROUTE);
2637
2638   {
2639     pg_node_t *pn;
2640     pn = pg_get_node (ip6_lookup_node.index);
2641     pn->unformat_edit = unformat_pg_ip6_header;
2642   }
2643
2644   /* Unless explicitly configured, don't process HBH options */
2645   im->hbh_enabled = 0;
2646
2647   {
2648     icmp6_neighbor_solicitation_header_t p;
2649
2650     memset (&p, 0, sizeof (p));
2651
2652     p.ip.ip_version_traffic_class_and_flow_label =
2653       clib_host_to_net_u32 (0x6 << 28);
2654     p.ip.payload_length =
2655       clib_host_to_net_u16 (sizeof (p) -
2656                             STRUCT_OFFSET_OF
2657                             (icmp6_neighbor_solicitation_header_t, neighbor));
2658     p.ip.protocol = IP_PROTOCOL_ICMP6;
2659     p.ip.hop_limit = 255;
2660     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2661
2662     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2663
2664     p.link_layer_option.header.type =
2665       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2666     p.link_layer_option.header.n_data_u64s =
2667       sizeof (p.link_layer_option) / sizeof (u64);
2668
2669     vlib_packet_template_init (vm,
2670                                &im->discover_neighbor_packet_template,
2671                                &p, sizeof (p),
2672                                /* alloc chunk size */ 8,
2673                                "ip6 neighbor discovery");
2674   }
2675
2676   return error;
2677 }
2678
2679 VLIB_INIT_FUNCTION (ip6_lookup_init);
2680
2681 void
2682 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip,
2683                                                   u8 * mac)
2684 {
2685   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2686   /* Invert the "u" bit */
2687   ip->as_u8[8] = mac[0] ^ (1 << 1);
2688   ip->as_u8[9] = mac[1];
2689   ip->as_u8[10] = mac[2];
2690   ip->as_u8[11] = 0xFF;
2691   ip->as_u8[12] = 0xFE;
2692   ip->as_u8[13] = mac[3];
2693   ip->as_u8[14] = mac[4];
2694   ip->as_u8[15] = mac[5];
2695 }
2696
2697 void
2698 ip6_ethernet_mac_address_from_link_local_address (u8 * mac,
2699                                                   ip6_address_t * ip)
2700 {
2701   /* Invert the previously inverted "u" bit */
2702   mac[0] = ip->as_u8[8] ^ (1 << 1);
2703   mac[1] = ip->as_u8[9];
2704   mac[2] = ip->as_u8[10];
2705   mac[3] = ip->as_u8[13];
2706   mac[4] = ip->as_u8[14];
2707   mac[5] = ip->as_u8[15];
2708 }
2709
2710 static clib_error_t *
2711 test_ip6_link_command_fn (vlib_main_t * vm,
2712                           unformat_input_t * input, vlib_cli_command_t * cmd)
2713 {
2714   u8 mac[6];
2715   ip6_address_t _a, *a = &_a;
2716
2717   if (unformat (input, "%U", unformat_ethernet_address, mac))
2718     {
2719       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2720       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2721       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2722       vlib_cli_output (vm, "Original MAC address: %U",
2723                        format_ethernet_address, mac);
2724     }
2725
2726   return 0;
2727 }
2728
2729 /*?
2730  * This command converts the given MAC Address into an IPv6 link-local
2731  * address.
2732  *
2733  * @cliexpar
2734  * Example of how to create an IPv6 link-local address:
2735  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2736  * Link local address: fe80::14d9:e0ff:fe91:7986
2737  * Original MAC address: 16:d9:e0:91:79:86
2738  * @cliexend
2739 ?*/
2740 /* *INDENT-OFF* */
2741 VLIB_CLI_COMMAND (test_link_command, static) =
2742 {
2743   .path = "test ip6 link",
2744   .function = test_ip6_link_command_fn,
2745   .short_help = "test ip6 link <mac-address>",
2746 };
2747 /* *INDENT-ON* */
2748
2749 int
2750 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2751 {
2752   u32 fib_index;
2753
2754   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2755
2756   if (~0 == fib_index)
2757     return VNET_API_ERROR_NO_SUCH_FIB;
2758
2759   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2760                                   flow_hash_config);
2761
2762   return 0;
2763 }
2764
2765 static clib_error_t *
2766 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2767                               unformat_input_t * input,
2768                               vlib_cli_command_t * cmd)
2769 {
2770   int matched = 0;
2771   u32 table_id = 0;
2772   u32 flow_hash_config = 0;
2773   int rv;
2774
2775   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2776     {
2777       if (unformat (input, "table %d", &table_id))
2778         matched = 1;
2779 #define _(a,v) \
2780     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2781       foreach_flow_hash_bit
2782 #undef _
2783         else
2784         break;
2785     }
2786
2787   if (matched == 0)
2788     return clib_error_return (0, "unknown input `%U'",
2789                               format_unformat_error, input);
2790
2791   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2792   switch (rv)
2793     {
2794     case 0:
2795       break;
2796
2797     case -1:
2798       return clib_error_return (0, "no such FIB table %d", table_id);
2799
2800     default:
2801       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2802       break;
2803     }
2804
2805   return 0;
2806 }
2807
2808 /*?
2809  * Configure the set of IPv6 fields used by the flow hash.
2810  *
2811  * @cliexpar
2812  * @parblock
2813  * Example of how to set the flow hash on a given table:
2814  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2815  *
2816  * Example of display the configured flow hash:
2817  * @cliexstart{show ip6 fib}
2818  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2819  * @::/0
2820  *   unicast-ip6-chain
2821  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2822  *     [0] [@0]: dpo-drop ip6
2823  * fe80::/10
2824  *   unicast-ip6-chain
2825  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2826  *     [0] [@2]: dpo-receive
2827  * ff02::1/128
2828  *   unicast-ip6-chain
2829  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2830  *     [0] [@2]: dpo-receive
2831  * ff02::2/128
2832  *   unicast-ip6-chain
2833  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2834  *     [0] [@2]: dpo-receive
2835  * ff02::16/128
2836  *   unicast-ip6-chain
2837  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2838  *     [0] [@2]: dpo-receive
2839  * ff02::1:ff00:0/104
2840  *   unicast-ip6-chain
2841  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2842  *     [0] [@2]: dpo-receive
2843  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2844  * @::/0
2845  *   unicast-ip6-chain
2846  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2847  *     [0] [@0]: dpo-drop ip6
2848  * @::a:1:1:0:4/126
2849  *   unicast-ip6-chain
2850  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2851  *     [0] [@4]: ipv6-glean: af_packet0
2852  * @::a:1:1:0:7/128
2853  *   unicast-ip6-chain
2854  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2855  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2856  * fe80::/10
2857  *   unicast-ip6-chain
2858  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2859  *     [0] [@2]: dpo-receive
2860  * fe80::fe:3eff:fe3e:9222/128
2861  *   unicast-ip6-chain
2862  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2863  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2864  * ff02::1/128
2865  *   unicast-ip6-chain
2866  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2867  *     [0] [@2]: dpo-receive
2868  * ff02::2/128
2869  *   unicast-ip6-chain
2870  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2871  *     [0] [@2]: dpo-receive
2872  * ff02::16/128
2873  *   unicast-ip6-chain
2874  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2875  *     [0] [@2]: dpo-receive
2876  * ff02::1:ff00:0/104
2877  *   unicast-ip6-chain
2878  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2879  *     [0] [@2]: dpo-receive
2880  * @cliexend
2881  * @endparblock
2882 ?*/
2883 /* *INDENT-OFF* */
2884 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2885 {
2886   .path = "set ip6 flow-hash",
2887   .short_help =
2888   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2889   .function = set_ip6_flow_hash_command_fn,
2890 };
2891 /* *INDENT-ON* */
2892
2893 static clib_error_t *
2894 show_ip6_local_command_fn (vlib_main_t * vm,
2895                            unformat_input_t * input, vlib_cli_command_t * cmd)
2896 {
2897   ip6_main_t *im = &ip6_main;
2898   ip_lookup_main_t *lm = &im->lookup_main;
2899   int i;
2900
2901   vlib_cli_output (vm, "Protocols handled by ip6_local");
2902   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2903     {
2904       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2905         {
2906
2907           u32 node_index = vlib_get_node (vm,
2908                                           ip6_local_node.index)->
2909             next_nodes[lm->local_next_by_ip_protocol[i]];
2910           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2911                            node_index);
2912         }
2913     }
2914   return 0;
2915 }
2916
2917
2918
2919 /*?
2920  * Display the set of protocols handled by the local IPv6 stack.
2921  *
2922  * @cliexpar
2923  * Example of how to display local protocol table:
2924  * @cliexstart{show ip6 local}
2925  * Protocols handled by ip6_local
2926  * 17
2927  * 43
2928  * 58
2929  * 115
2930  * @cliexend
2931 ?*/
2932 /* *INDENT-OFF* */
2933 VLIB_CLI_COMMAND (show_ip6_local, static) =
2934 {
2935   .path = "show ip6 local",
2936   .function = show_ip6_local_command_fn,
2937   .short_help = "show ip6 local",
2938 };
2939 /* *INDENT-ON* */
2940
2941 int
2942 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2943                              u32 table_index)
2944 {
2945   vnet_main_t *vnm = vnet_get_main ();
2946   vnet_interface_main_t *im = &vnm->interface_main;
2947   ip6_main_t *ipm = &ip6_main;
2948   ip_lookup_main_t *lm = &ipm->lookup_main;
2949   vnet_classify_main_t *cm = &vnet_classify_main;
2950   ip6_address_t *if_addr;
2951
2952   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2953     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2954
2955   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2956     return VNET_API_ERROR_NO_SUCH_ENTRY;
2957
2958   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2959   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2960
2961   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2962
2963   if (NULL != if_addr)
2964     {
2965       fib_prefix_t pfx = {
2966         .fp_len = 128,
2967         .fp_proto = FIB_PROTOCOL_IP6,
2968         .fp_addr.ip6 = *if_addr,
2969       };
2970       u32 fib_index;
2971
2972       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2973                                                        sw_if_index);
2974
2975
2976       if (table_index != (u32) ~ 0)
2977         {
2978           dpo_id_t dpo = DPO_INVALID;
2979
2980           dpo_set (&dpo,
2981                    DPO_CLASSIFY,
2982                    DPO_PROTO_IP6,
2983                    classify_dpo_create (DPO_PROTO_IP6, table_index));
2984
2985           fib_table_entry_special_dpo_add (fib_index,
2986                                            &pfx,
2987                                            FIB_SOURCE_CLASSIFY,
2988                                            FIB_ENTRY_FLAG_NONE, &dpo);
2989           dpo_reset (&dpo);
2990         }
2991       else
2992         {
2993           fib_table_entry_special_remove (fib_index,
2994                                           &pfx, FIB_SOURCE_CLASSIFY);
2995         }
2996     }
2997
2998   return 0;
2999 }
3000
3001 static clib_error_t *
3002 set_ip6_classify_command_fn (vlib_main_t * vm,
3003                              unformat_input_t * input,
3004                              vlib_cli_command_t * cmd)
3005 {
3006   u32 table_index = ~0;
3007   int table_index_set = 0;
3008   u32 sw_if_index = ~0;
3009   int rv;
3010
3011   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3012     {
3013       if (unformat (input, "table-index %d", &table_index))
3014         table_index_set = 1;
3015       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3016                          vnet_get_main (), &sw_if_index))
3017         ;
3018       else
3019         break;
3020     }
3021
3022   if (table_index_set == 0)
3023     return clib_error_return (0, "classify table-index must be specified");
3024
3025   if (sw_if_index == ~0)
3026     return clib_error_return (0, "interface / subif must be specified");
3027
3028   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3029
3030   switch (rv)
3031     {
3032     case 0:
3033       break;
3034
3035     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3036       return clib_error_return (0, "No such interface");
3037
3038     case VNET_API_ERROR_NO_SUCH_ENTRY:
3039       return clib_error_return (0, "No such classifier table");
3040     }
3041   return 0;
3042 }
3043
3044 /*?
3045  * Assign a classification table to an interface. The classification
3046  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3047  * commands. Once the table is create, use this command to filter packets
3048  * on an interface.
3049  *
3050  * @cliexpar
3051  * Example of how to assign a classification table to an interface:
3052  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3053 ?*/
3054 /* *INDENT-OFF* */
3055 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3056 {
3057   .path = "set ip6 classify",
3058   .short_help =
3059   "set ip6 classify intfc <interface> table-index <classify-idx>",
3060   .function = set_ip6_classify_command_fn,
3061 };
3062 /* *INDENT-ON* */
3063
3064 static clib_error_t *
3065 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3066 {
3067   ip6_main_t *im = &ip6_main;
3068   uword heapsize = 0;
3069   u32 tmp;
3070   u32 nbuckets = 0;
3071
3072   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3073     {
3074       if (unformat (input, "hash-buckets %d", &tmp))
3075         nbuckets = tmp;
3076       else if (unformat (input, "heap-size %U",
3077                          unformat_memory_size, &heapsize))
3078         ;
3079       else
3080         return clib_error_return (0, "unknown input '%U'",
3081                                   format_unformat_error, input);
3082     }
3083
3084   im->lookup_table_nbuckets = nbuckets;
3085   im->lookup_table_size = heapsize;
3086
3087   return 0;
3088 }
3089
3090 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3091
3092 /*
3093  * fd.io coding-style-patch-verification: ON
3094  *
3095  * Local Variables:
3096  * eval: (c-set-style "gnu")
3097  * End:
3098  */