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 #ifndef CLIB_MARCH_VARIANT
  54 #include <vppinfra/bihash_template.c>
  55 #endif
  56 #include <vnet/ip/ip6_forward.h>
  57
  58 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  59 #define OI_DECAP   0x80000000
  60
  61 static void
  62 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
  63                           ip6_main_t * im, u32 fib_index,
  64                           ip_interface_address_t * a)
  65 {
  66   ip_lookup_main_t *lm = &im->lookup_main;
  67   ip6_address_t *address = ip_interface_address_get_address (lm, a);
  68   fib_prefix_t pfx = {
  69     .fp_len = a->address_length,
  70     .fp_proto = FIB_PROTOCOL_IP6,
  71     .fp_addr.ip6 = *address,
  72   };
  73
  74   if (a->address_length < 128)
  75     {
  76       fib_table_entry_update_one_path (fib_index,
  77                                        &pfx,
  78                                        FIB_SOURCE_INTERFACE,
  79                                        (FIB_ENTRY_FLAG_CONNECTED |
  80                                         FIB_ENTRY_FLAG_ATTACHED),
  81                                        DPO_PROTO_IP6,
  82                                        /* No next-hop address */
  83                                        NULL, sw_if_index,
  84                                        /* invalid FIB index */
  85                                        ~0, 1,
  86                                        /* no label stack */
  87                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
  88     }
  89
  90   pfx.fp_len = 128;
  91   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
  92     {
  93       u32 classify_table_index =
  94         lm->classify_table_index_by_sw_if_index[sw_if_index];
  95       if (classify_table_index != (u32) ~ 0)
  96         {
  97           dpo_id_t dpo = DPO_INVALID;
  98
  99           dpo_set (&dpo,
 100                    DPO_CLASSIFY,
 101                    DPO_PROTO_IP6,
 102                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 103
 104           fib_table_entry_special_dpo_add (fib_index,
 105                                            &pfx,
 106                                            FIB_SOURCE_CLASSIFY,
 107                                            FIB_ENTRY_FLAG_NONE, &dpo);
 108           dpo_reset (&dpo);
 109         }
 110     }
 111
 112   fib_table_entry_update_one_path (fib_index, &pfx,
 113                                    FIB_SOURCE_INTERFACE,
 114                                    (FIB_ENTRY_FLAG_CONNECTED |
 115                                     FIB_ENTRY_FLAG_LOCAL),
 116                                    DPO_PROTO_IP6,
 117                                    &pfx.fp_addr,
 118                                    sw_if_index, ~0,
 119                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 120 }
 121
 122 static void
 123 ip6_del_interface_routes (ip6_main_t * im,
 124                           u32 fib_index,
 125                           ip6_address_t * address, u32 address_length)
 126 {
 127   fib_prefix_t pfx = {
 128     .fp_len = address_length,
 129     .fp_proto = FIB_PROTOCOL_IP6,
 130     .fp_addr.ip6 = *address,
 131   };
 132
 133   if (pfx.fp_len < 128)
 134     {
 135       fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 136
 137     }
 138
 139   pfx.fp_len = 128;
 140   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 141 }
 142
 143 #ifndef CLIB_MARCH_VARIANT
 144 void
 145 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 146 {
 147   ip6_main_t *im = &ip6_main;
 148
 149   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 150
 151   /*
 152    * enable/disable only on the 1<->0 transition
 153    */
 154   if (is_enable)
 155     {
 156       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 157         return;
 158     }
 159   else
 160     {
 161       /* The ref count is 0 when an address is removed from an interface that has
 162        * no address - this is not a ciritical error */
 163       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 164           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 165         return;
 166     }
 167
 168   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 169                                !is_enable, 0, 0);
 170
 171   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 172                                sw_if_index, !is_enable, 0, 0);
 173 }
 174
 175 /* get first interface address */
 176 ip6_address_t *
 177 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 178 {
 179   ip_lookup_main_t *lm = &im->lookup_main;
 180   ip_interface_address_t *ia = 0;
 181   ip6_address_t *result = 0;
 182
 183   /* *INDENT-OFF* */
 184   foreach_ip_interface_address (lm, ia, sw_if_index,
 185                                 1 /* honor unnumbered */,
 186   ({
 187     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 188     result = a;
 189     break;
 190   }));
 191   /* *INDENT-ON* */
 192   return result;
 193 }
 194
 195 clib_error_t *
 196 ip6_add_del_interface_address (vlib_main_t * vm,
 197                                u32 sw_if_index,
 198                                ip6_address_t * address,
 199                                u32 address_length, u32 is_del)
 200 {
 201   vnet_main_t *vnm = vnet_get_main ();
 202   ip6_main_t *im = &ip6_main;
 203   ip_lookup_main_t *lm = &im->lookup_main;
 204   clib_error_t *error;
 205   u32 if_address_index;
 206   ip6_address_fib_t ip6_af, *addr_fib = 0;
 207   ip6_address_t ll_addr;
 208
 209   /* local0 interface doesn't support IP addressing */
 210   if (sw_if_index == 0)
 211     {
 212       return
 213         clib_error_create ("local0 interface doesn't support IP addressing");
 214     }
 215
 216   if (ip6_address_is_link_local_unicast (address))
 217     {
 218       if (address_length != 128)
 219         {
 220           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 221           return
 222             clib_error_create
 223             ("prefix length of link-local address must be 128");
 224         }
 225       if (!is_del)
 226         {
 227           return ip6_neighbor_set_link_local_address (vm, sw_if_index,
 228                                                       address);
 229         }
 230       else
 231         {
 232           ll_addr = ip6_neighbor_get_link_local_address (sw_if_index);
 233           if (ip6_address_is_equal (&ll_addr, address))
 234             {
 235               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 236               return clib_error_create ("address not deletable");
 237             }
 238           else
 239             {
 240               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 241               return clib_error_create ("address not found");
 242             }
 243         }
 244     }
 245
 246   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 247   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 248
 249   ip6_addr_fib_init (&ip6_af, address,
 250                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 251   vec_add1 (addr_fib, ip6_af);
 252
 253   /* *INDENT-OFF* */
 254   if (!is_del)
 255     {
 256       /* When adding an address check that it does not conflict
 257          with an existing address on any interface in this table. */
 258       ip_interface_address_t *ia;
 259       vnet_sw_interface_t *sif;
 260
 261       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 262       ({
 263           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 264               im->fib_index_by_sw_if_index[sif->sw_if_index])
 265             {
 266               foreach_ip_interface_address
 267                 (&im->lookup_main, ia, sif->sw_if_index,
 268                  0 /* honor unnumbered */ ,
 269                  ({
 270                    ip6_address_t * x =
 271                      ip_interface_address_get_address
 272                      (&im->lookup_main, ia);
 273                    if (ip6_destination_matches_route
 274                        (im, address, x, ia->address_length) ||
 275                        ip6_destination_matches_route (im,
 276                                                       x,
 277                                                       address,
 278                                                       address_length))
 279                      {
 280                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 281                        return
 282                          clib_error_create
 283                          ("failed to add %U which conflicts with %U for interface %U",
 284                           format_ip6_address_and_length, address,
 285                           address_length,
 286                           format_ip6_address_and_length, x,
 287                           ia->address_length,
 288                           format_vnet_sw_if_index_name, vnm,
 289                           sif->sw_if_index);
 290                      }
 291                  }));
 292             }
 293       }));
 294     }
 295   /* *INDENT-ON* */
 296
 297   {
 298     uword elts_before = pool_elts (lm->if_address_pool);
 299
 300     error = ip_interface_address_add_del
 301       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 302     if (error)
 303       goto done;
 304
 305     /* Pool did not grow: add duplicate address. */
 306     if (elts_before == pool_elts (lm->if_address_pool))
 307       goto done;
 308   }
 309
 310   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 311
 312   if (is_del)
 313     ip6_del_interface_routes (im, ip6_af.fib_index, address, address_length);
 314   else
 315     ip6_add_interface_routes (vnm, sw_if_index,
 316                               im, ip6_af.fib_index,
 317                               pool_elt_at_index (lm->if_address_pool,
 318                                                  if_address_index));
 319
 320   {
 321     ip6_add_del_interface_address_callback_t *cb;
 322     vec_foreach (cb, im->add_del_interface_address_callbacks)
 323       cb->function (im, cb->function_opaque, sw_if_index,
 324                     address, address_length, if_address_index, is_del);
 325   }
 326
 327 done:
 328   vec_free (addr_fib);
 329   return error;
 330 }
 331
 332 #endif
 333
 334 static clib_error_t *
 335 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 336 {
 337   ip6_main_t *im = &ip6_main;
 338   ip_interface_address_t *ia;
 339   ip6_address_t *a;
 340   u32 is_admin_up, fib_index;
 341
 342   /* Fill in lookup tables with default table (0). */
 343   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 344
 345   vec_validate_init_empty (im->
 346                            lookup_main.if_address_pool_index_by_sw_if_index,
 347                            sw_if_index, ~0);
 348
 349   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 350
 351   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 352
 353   /* *INDENT-OFF* */
 354   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 355                                 0 /* honor unnumbered */,
 356   ({
 357     a = ip_interface_address_get_address (&im->lookup_main, ia);
 358     if (is_admin_up)
 359       ip6_add_interface_routes (vnm, sw_if_index,
 360                                 im, fib_index,
 361                                 ia);
 362     else
 363       ip6_del_interface_routes (im, fib_index,
 364                                 a, ia->address_length);
 365   }));
 366   /* *INDENT-ON* */
 367
 368   return 0;
 369 }
 370
 371 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 372
 373 /* Built-in ip6 unicast rx feature path definition */
 374 /* *INDENT-OFF* */
 375 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 376 {
 377   .arc_name  = "ip6-unicast",
 378   .start_nodes = VNET_FEATURES ("ip6-input"),
 379   .last_in_arc = "ip6-lookup",
 380   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 381 };
 382
 383 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 384 {
 385   .arc_name = "ip6-unicast",
 386   .node_name = "ip6-flow-classify",
 387   .runs_before = VNET_FEATURES ("ip6-inacl"),
 388 };
 389
 390 VNET_FEATURE_INIT (ip6_inacl, static) =
 391 {
 392   .arc_name = "ip6-unicast",
 393   .node_name = "ip6-inacl",
 394   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 395 };
 396
 397 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 398 {
 399   .arc_name = "ip6-unicast",
 400   .node_name = "ip6-policer-classify",
 401   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 402 };
 403
 404 VNET_FEATURE_INIT (ip6_ipsec, static) =
 405 {
 406   .arc_name = "ip6-unicast",
 407   .node_name = "ipsec6-input-feature",
 408   .runs_before = VNET_FEATURES ("l2tp-decap"),
 409 };
 410
 411 VNET_FEATURE_INIT (ip6_l2tp, static) =
 412 {
 413   .arc_name = "ip6-unicast",
 414   .node_name = "l2tp-decap",
 415   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 416 };
 417
 418 VNET_FEATURE_INIT (ip6_vpath, static) =
 419 {
 420   .arc_name = "ip6-unicast",
 421   .node_name = "vpath-input-ip6",
 422   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 423 };
 424
 425 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 426 {
 427   .arc_name = "ip6-unicast",
 428   .node_name = "ip6-vxlan-bypass",
 429   .runs_before = VNET_FEATURES ("ip6-lookup"),
 430 };
 431
 432 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 433 {
 434   .arc_name = "ip6-unicast",
 435   .node_name = "ip6-not-enabled",
 436   .runs_before = VNET_FEATURES ("ip6-lookup"),
 437 };
 438
 439 VNET_FEATURE_INIT (ip6_lookup, static) =
 440 {
 441   .arc_name = "ip6-unicast",
 442   .node_name = "ip6-lookup",
 443   .runs_before = 0,  /*last feature*/
 444 };
 445
 446 /* Built-in ip6 multicast rx feature path definition (none now) */
 447 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 448 {
 449   .arc_name  = "ip6-multicast",
 450   .start_nodes = VNET_FEATURES ("ip6-input"),
 451   .last_in_arc = "ip6-mfib-forward-lookup",
 452   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 453 };
 454
 455 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 456   .arc_name = "ip6-multicast",
 457   .node_name = "vpath-input-ip6",
 458   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 459 };
 460
 461 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 462   .arc_name = "ip6-multicast",
 463   .node_name = "ip6-not-enabled",
 464   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 465 };
 466
 467 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 468   .arc_name = "ip6-multicast",
 469   .node_name = "ip6-mfib-forward-lookup",
 470   .runs_before = 0, /* last feature */
 471 };
 472
 473 /* Built-in ip4 tx feature path definition */
 474 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 475 {
 476   .arc_name  = "ip6-output",
 477   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 478   .last_in_arc = "interface-output",
 479   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 480 };
 481
 482 VNET_FEATURE_INIT (ip6_outacl, static) = {
 483   .arc_name = "ip6-output",
 484   .node_name = "ip6-outacl",
 485   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 486 };
 487
 488 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 489   .arc_name = "ip6-output",
 490   .node_name = "ipsec6-output-feature",
 491   .runs_before = VNET_FEATURES ("interface-output"),
 492 };
 493
 494 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 495   .arc_name = "ip6-output",
 496   .node_name = "interface-output",
 497   .runs_before = 0, /* not before any other features */
 498 };
 499 /* *INDENT-ON* */
 500
 501 static clib_error_t *
 502 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 503 {
 504   ip6_main_t *im = &ip6_main;
 505
 506   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 507   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 508
 509   if (!is_add)
 510     {
 511       /* Ensure that IPv6 is disabled */
 512       ip6_main_t *im6 = &ip6_main;
 513       ip_lookup_main_t *lm6 = &im6->lookup_main;
 514       ip_interface_address_t *ia = 0;
 515       ip6_address_t *address;
 516       vlib_main_t *vm = vlib_get_main ();
 517
 518       ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ );
 519       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 520       /* *INDENT-OFF* */
 521       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 522       ({
 523         address = ip_interface_address_get_address (lm6, ia);
 524         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 525       }));
 526       /* *INDENT-ON* */
 527       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 528     }
 529
 530   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 531                                is_add, 0, 0);
 532
 533   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 534                                sw_if_index, is_add, 0, 0);
 535
 536   return /* no error */ 0;
 537 }
 538
 539 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 540
 541 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 542                                 vlib_node_runtime_t * node,
 543                                 vlib_frame_t * frame)
 544 {
 545   return ip6_lookup_inline (vm, node, frame);
 546 }
 547
 548 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 549
 550 /* *INDENT-OFF* */
 551 VLIB_REGISTER_NODE (ip6_lookup_node) =
 552 {
 553   .name = "ip6-lookup",
 554   .vector_size = sizeof (u32),
 555   .format_trace = format_ip6_lookup_trace,
 556   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 557   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 558 };
 559 /* *INDENT-ON* */
 560
 561 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 562                                       vlib_node_runtime_t * node,
 563                                       vlib_frame_t * frame)
 564 {
 565   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 566   u32 n_left_from, n_left_to_next, *from, *to_next;
 567   ip_lookup_next_t next;
 568   u32 thread_index = vm->thread_index;
 569   ip6_main_t *im = &ip6_main;
 570
 571   from = vlib_frame_vector_args (frame);
 572   n_left_from = frame->n_vectors;
 573   next = node->cached_next_index;
 574
 575   while (n_left_from > 0)
 576     {
 577       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 578
 579
 580       while (n_left_from >= 4 && n_left_to_next >= 2)
 581         {
 582           ip_lookup_next_t next0, next1;
 583           const load_balance_t *lb0, *lb1;
 584           vlib_buffer_t *p0, *p1;
 585           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 586           const ip6_header_t *ip0, *ip1;
 587           const dpo_id_t *dpo0, *dpo1;
 588
 589           /* Prefetch next iteration. */
 590           {
 591             vlib_buffer_t *p2, *p3;
 592
 593             p2 = vlib_get_buffer (vm, from[2]);
 594             p3 = vlib_get_buffer (vm, from[3]);
 595
 596             vlib_prefetch_buffer_header (p2, STORE);
 597             vlib_prefetch_buffer_header (p3, STORE);
 598
 599             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 600             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 601           }
 602
 603           pi0 = to_next[0] = from[0];
 604           pi1 = to_next[1] = from[1];
 605
 606           from += 2;
 607           n_left_from -= 2;
 608           to_next += 2;
 609           n_left_to_next -= 2;
 610
 611           p0 = vlib_get_buffer (vm, pi0);
 612           p1 = vlib_get_buffer (vm, pi1);
 613
 614           ip0 = vlib_buffer_get_current (p0);
 615           ip1 = vlib_buffer_get_current (p1);
 616           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 617           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 618
 619           lb0 = load_balance_get (lbi0);
 620           lb1 = load_balance_get (lbi1);
 621
 622           /*
 623            * this node is for via FIBs we can re-use the hash value from the
 624            * to node if present.
 625            * We don't want to use the same hash value at each level in the recursion
 626            * graph as that would lead to polarisation
 627            */
 628           hc0 = hc1 = 0;
 629
 630           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 631             {
 632               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 633                 {
 634                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 635                     vnet_buffer (p0)->ip.flow_hash >> 1;
 636                 }
 637               else
 638                 {
 639                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 640                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 641                 }
 642               dpo0 =
 643                 load_balance_get_fwd_bucket (lb0,
 644                                              (hc0 &
 645                                               lb0->lb_n_buckets_minus_1));
 646             }
 647           else
 648             {
 649               dpo0 = load_balance_get_bucket_i (lb0, 0);
 650             }
 651           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 652             {
 653               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 654                 {
 655                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 656                     vnet_buffer (p1)->ip.flow_hash >> 1;
 657                 }
 658               else
 659                 {
 660                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 661                     ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 662                 }
 663               dpo1 =
 664                 load_balance_get_fwd_bucket (lb1,
 665                                              (hc1 &
 666                                               lb1->lb_n_buckets_minus_1));
 667             }
 668           else
 669             {
 670               dpo1 = load_balance_get_bucket_i (lb1, 0);
 671             }
 672
 673           next0 = dpo0->dpoi_next_node;
 674           next1 = dpo1->dpoi_next_node;
 675
 676           /* Only process the HBH Option Header if explicitly configured to do so */
 677           if (PREDICT_FALSE
 678               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 679             {
 680               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 681                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 682             }
 683           /* Only process the HBH Option Header if explicitly configured to do so */
 684           if (PREDICT_FALSE
 685               (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 686             {
 687               next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 688                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 689             }
 690
 691           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 692           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 693
 694           vlib_increment_combined_counter
 695             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 696           vlib_increment_combined_counter
 697             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 698
 699           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 700                                            to_next, n_left_to_next,
 701                                            pi0, pi1, next0, next1);
 702         }
 703
 704       while (n_left_from > 0 && n_left_to_next > 0)
 705         {
 706           ip_lookup_next_t next0;
 707           const load_balance_t *lb0;
 708           vlib_buffer_t *p0;
 709           u32 pi0, lbi0, hc0;
 710           const ip6_header_t *ip0;
 711           const dpo_id_t *dpo0;
 712
 713           pi0 = from[0];
 714           to_next[0] = pi0;
 715           from += 1;
 716           to_next += 1;
 717           n_left_to_next -= 1;
 718           n_left_from -= 1;
 719
 720           p0 = vlib_get_buffer (vm, pi0);
 721
 722           ip0 = vlib_buffer_get_current (p0);
 723           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 724
 725           lb0 = load_balance_get (lbi0);
 726
 727           hc0 = 0;
 728           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 729             {
 730               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 731                 {
 732                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 733                     vnet_buffer (p0)->ip.flow_hash >> 1;
 734                 }
 735               else
 736                 {
 737                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 738                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 739                 }
 740               dpo0 =
 741                 load_balance_get_fwd_bucket (lb0,
 742                                              (hc0 &
 743                                               lb0->lb_n_buckets_minus_1));
 744             }
 745           else
 746             {
 747               dpo0 = load_balance_get_bucket_i (lb0, 0);
 748             }
 749
 750           next0 = dpo0->dpoi_next_node;
 751           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 752
 753           /* Only process the HBH Option Header if explicitly configured to do so */
 754           if (PREDICT_FALSE
 755               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 756             {
 757               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 758                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 759             }
 760
 761           vlib_increment_combined_counter
 762             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 763
 764           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 765                                            to_next, n_left_to_next,
 766                                            pi0, next0);
 767         }
 768
 769       vlib_put_next_frame (vm, node, next, n_left_to_next);
 770     }
 771
 772   if (node->flags & VLIB_NODE_FLAG_TRACE)
 773     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 774
 775   return frame->n_vectors;
 776 }
 777
 778 /* *INDENT-OFF* */
 779 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 780 {
 781   .name = "ip6-load-balance",
 782   .vector_size = sizeof (u32),
 783   .sibling_of = "ip6-lookup",
 784   .format_trace = format_ip6_lookup_trace,
 785 };
 786 /* *INDENT-ON* */
 787
 788 typedef struct
 789 {
 790   /* Adjacency taken. */
 791   u32 adj_index;
 792   u32 flow_hash;
 793   u32 fib_index;
 794
 795   /* Packet data, possibly *after* rewrite. */
 796   u8 packet_data[128 - 1 * sizeof (u32)];
 797 }
 798 ip6_forward_next_trace_t;
 799
 800 #ifndef CLIB_MARCH_VARIANT
 801 u8 *
 802 format_ip6_forward_next_trace (u8 * s, va_list * args)
 803 {
 804   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 805   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 806   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 807   u32 indent = format_get_indent (s);
 808
 809   s = format (s, "%U%U",
 810               format_white_space, indent,
 811               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 812   return s;
 813 }
 814 #endif
 815
 816 static u8 *
 817 format_ip6_lookup_trace (u8 * s, va_list * args)
 818 {
 819   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 820   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 821   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 822   u32 indent = format_get_indent (s);
 823
 824   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 825               t->fib_index, t->adj_index, t->flow_hash);
 826   s = format (s, "\n%U%U",
 827               format_white_space, indent,
 828               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 829   return s;
 830 }
 831
 832
 833 static u8 *
 834 format_ip6_rewrite_trace (u8 * s, va_list * args)
 835 {
 836   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 837   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 838   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 839   u32 indent = format_get_indent (s);
 840
 841   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 842               t->fib_index, t->adj_index, format_ip_adjacency,
 843               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 844   s = format (s, "\n%U%U",
 845               format_white_space, indent,
 846               format_ip_adjacency_packet_data,
 847               t->adj_index, t->packet_data, sizeof (t->packet_data));
 848   return s;
 849 }
 850
 851 /* Common trace function for all ip6-forward next nodes. */
 852 #ifndef CLIB_MARCH_VARIANT
 853 void
 854 ip6_forward_next_trace (vlib_main_t * vm,
 855                         vlib_node_runtime_t * node,
 856                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 857 {
 858   u32 *from, n_left;
 859   ip6_main_t *im = &ip6_main;
 860
 861   n_left = frame->n_vectors;
 862   from = vlib_frame_vector_args (frame);
 863
 864   while (n_left >= 4)
 865     {
 866       u32 bi0, bi1;
 867       vlib_buffer_t *b0, *b1;
 868       ip6_forward_next_trace_t *t0, *t1;
 869
 870       /* Prefetch next iteration. */
 871       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 872       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 873
 874       bi0 = from[0];
 875       bi1 = from[1];
 876
 877       b0 = vlib_get_buffer (vm, bi0);
 878       b1 = vlib_get_buffer (vm, bi1);
 879
 880       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 881         {
 882           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 883           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 884           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 885           t0->fib_index =
 886             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 887              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 888             vec_elt (im->fib_index_by_sw_if_index,
 889                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 890
 891           clib_memcpy_fast (t0->packet_data,
 892                             vlib_buffer_get_current (b0),
 893                             sizeof (t0->packet_data));
 894         }
 895       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 896         {
 897           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 898           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 899           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 900           t1->fib_index =
 901             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 902              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 903             vec_elt (im->fib_index_by_sw_if_index,
 904                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 905
 906           clib_memcpy_fast (t1->packet_data,
 907                             vlib_buffer_get_current (b1),
 908                             sizeof (t1->packet_data));
 909         }
 910       from += 2;
 911       n_left -= 2;
 912     }
 913
 914   while (n_left >= 1)
 915     {
 916       u32 bi0;
 917       vlib_buffer_t *b0;
 918       ip6_forward_next_trace_t *t0;
 919
 920       bi0 = from[0];
 921
 922       b0 = vlib_get_buffer (vm, bi0);
 923
 924       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 925         {
 926           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 927           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 928           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 929           t0->fib_index =
 930             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 931              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 932             vec_elt (im->fib_index_by_sw_if_index,
 933                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 934
 935           clib_memcpy_fast (t0->packet_data,
 936                             vlib_buffer_get_current (b0),
 937                             sizeof (t0->packet_data));
 938         }
 939       from += 1;
 940       n_left -= 1;
 941     }
 942 }
 943
 944 /* Compute TCP/UDP/ICMP6 checksum in software. */
 945 u16
 946 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
 947                                    ip6_header_t * ip0, int *bogus_lengthp)
 948 {
 949   ip_csum_t sum0;
 950   u16 sum16, payload_length_host_byte_order;
 951   u32 i, n_this_buffer, n_bytes_left;
 952   u32 headers_size = sizeof (ip0[0]);
 953   void *data_this_buffer;
 954
 955   ASSERT (bogus_lengthp);
 956   *bogus_lengthp = 0;
 957
 958   /* Initialize checksum with ip header. */
 959   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
 960   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
 961   data_this_buffer = (void *) (ip0 + 1);
 962
 963   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
 964     {
 965       sum0 = ip_csum_with_carry (sum0,
 966                                  clib_mem_unaligned (&ip0->
 967                                                      src_address.as_uword[i],
 968                                                      uword));
 969       sum0 =
 970         ip_csum_with_carry (sum0,
 971                             clib_mem_unaligned (&ip0->dst_address.as_uword[i],
 972                                                 uword));
 973     }
 974
 975   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
 976    * or UDP-Ping packets */
 977   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 978     {
 979       u32 skip_bytes;
 980       ip6_hop_by_hop_ext_t *ext_hdr =
 981         (ip6_hop_by_hop_ext_t *) data_this_buffer;
 982
 983       /* validate really icmp6 next */
 984       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
 985               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
 986
 987       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
 988       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
 989
 990       payload_length_host_byte_order -= skip_bytes;
 991       headers_size += skip_bytes;
 992     }
 993
 994   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
 995   if (p0 && n_this_buffer + headers_size > p0->current_length)
 996     n_this_buffer =
 997       p0->current_length >
 998       headers_size ? p0->current_length - headers_size : 0;
 999   while (1)
1000     {
1001       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1002       n_bytes_left -= n_this_buffer;
1003       if (n_bytes_left == 0)
1004         break;
1005
1006       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1007         {
1008           *bogus_lengthp = 1;
1009           return 0xfefe;
1010         }
1011       p0 = vlib_get_buffer (vm, p0->next_buffer);
1012       data_this_buffer = vlib_buffer_get_current (p0);
1013       n_this_buffer = p0->current_length;
1014     }
1015
1016   sum16 = ~ip_csum_fold (sum0);
1017
1018   return sum16;
1019 }
1020
1021 u32
1022 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1023 {
1024   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1025   udp_header_t *udp0;
1026   u16 sum16;
1027   int bogus_length;
1028
1029   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1030   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1031           || ip0->protocol == IP_PROTOCOL_ICMP6
1032           || ip0->protocol == IP_PROTOCOL_UDP
1033           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1034
1035   udp0 = (void *) (ip0 + 1);
1036   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1037     {
1038       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1039                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1040       return p0->flags;
1041     }
1042
1043   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1044
1045   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1046                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1047
1048   return p0->flags;
1049 }
1050 #endif
1051
1052 /**
1053  * @brief returns number of links on which src is reachable.
1054  */
1055 always_inline int
1056 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1057 {
1058   const load_balance_t *lb0;
1059   index_t lbi;
1060   u32 fib_index;
1061
1062   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1063                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1064   fib_index =
1065     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1066     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1067
1068   lbi = ip6_fib_table_fwding_lookup (im, fib_index, &i->src_address);
1069   lb0 = load_balance_get (lbi);
1070
1071   return (fib_urpf_check_size (lb0->lb_urpf));
1072 }
1073
1074 always_inline u8
1075 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1076                            u32 * udp_offset0)
1077 {
1078   u32 proto0;
1079   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1080   if (proto0 != IP_PROTOCOL_UDP)
1081     {
1082       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1083       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1084     }
1085   return proto0;
1086 }
1087
1088 /* *INDENT-OFF* */
1089 VNET_FEATURE_ARC_INIT (ip6_local) =
1090 {
1091   .arc_name  = "ip6-local",
1092   .start_nodes = VNET_FEATURES ("ip6-local"),
1093 };
1094 /* *INDENT-ON* */
1095
1096 always_inline uword
1097 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1098                   vlib_frame_t * frame, int head_of_feature_arc)
1099 {
1100   ip6_main_t *im = &ip6_main;
1101   ip_lookup_main_t *lm = &im->lookup_main;
1102   u32 *from, n_left_from;
1103   vlib_node_runtime_t *error_node =
1104     vlib_node_get_runtime (vm, ip6_input_node.index);
1105   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1106   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1107   u16 nexts[VLIB_FRAME_SIZE], *next;
1108
1109   from = vlib_frame_vector_args (frame);
1110   n_left_from = frame->n_vectors;
1111
1112   if (node->flags & VLIB_NODE_FLAG_TRACE)
1113     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1114
1115   vlib_get_buffers (vm, from, bufs, n_left_from);
1116   b = bufs;
1117   next = nexts;
1118
1119   while (n_left_from > 2)
1120     {
1121       /* Prefetch next iteration. */
1122       if (n_left_from >= 6)
1123         {
1124           vlib_prefetch_buffer_header (b[4], STORE);
1125           vlib_prefetch_buffer_header (b[5], STORE);
1126           vlib_prefetch_buffer_data (b[2], LOAD);
1127           vlib_prefetch_buffer_data (b[3], LOAD);
1128         }
1129
1130       u8 error[2];
1131       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1132       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1133
1134       ip6_header_t *ip[2];
1135       ip[0] = vlib_buffer_get_current (b[0]);
1136       ip[1] = vlib_buffer_get_current (b[1]);
1137
1138       if (head_of_feature_arc)
1139         {
1140           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1141           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1142
1143           u8 type[2];
1144           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1145           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1146
1147           u32 flags[2];
1148           flags[0] = b[0]->flags;
1149           flags[1] = b[1]->flags;
1150
1151           u32 good_l4_csum[2];
1152           good_l4_csum[0] =
1153             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1154                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1155                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1156           good_l4_csum[1] =
1157             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1158                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1159                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1160
1161           u32 udp_offset[2] = { };
1162           u8 is_tcp_udp[2];
1163           is_tcp_udp[0] =
1164             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1165           is_tcp_udp[1] =
1166             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1167           i16 len_diff[2] = { 0 };
1168           if (PREDICT_TRUE (is_tcp_udp[0]))
1169             {
1170               udp_header_t *udp =
1171                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1172               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1173                 && udp->checksum == 0;
1174               /* optimistically verify UDP length. */
1175               u16 ip_len, udp_len;
1176               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1177               udp_len = clib_net_to_host_u16 (udp->length);
1178               len_diff[0] = ip_len - udp_len;
1179             }
1180           if (PREDICT_TRUE (is_tcp_udp[1]))
1181             {
1182               udp_header_t *udp =
1183                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1184               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1185                 && udp->checksum == 0;
1186               /* optimistically verify UDP length. */
1187               u16 ip_len, udp_len;
1188               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1189               udp_len = clib_net_to_host_u16 (udp->length);
1190               len_diff[1] = ip_len - udp_len;
1191             }
1192
1193           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1194           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1195
1196           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1197           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1198
1199           u8 need_csum[2];
1200           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1201             && !good_l4_csum[0]
1202             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1203           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1204             && !good_l4_csum[1]
1205             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1206           if (PREDICT_FALSE (need_csum[0]))
1207             {
1208               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1209               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1210             }
1211           if (PREDICT_FALSE (need_csum[1]))
1212             {
1213               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1214               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1215             }
1216
1217           error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1218           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1219           error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1220           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1221
1222           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1223                          IP6_ERROR_UDP_CHECKSUM,
1224                          "Wrong IP6 errors constants");
1225           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1226                          IP6_ERROR_ICMP_CHECKSUM,
1227                          "Wrong IP6 errors constants");
1228
1229           error[0] =
1230             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1231           error[1] =
1232             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1233
1234           /* Drop packets from unroutable hosts. */
1235           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1236           u8 unroutable[2];
1237           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1238             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1239             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1240           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1241             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1242             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1243           if (PREDICT_FALSE (unroutable[0]))
1244             {
1245               error[0] =
1246                 !ip6_urpf_loose_check (im, b[0],
1247                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1248                 : error[0];
1249             }
1250           if (PREDICT_FALSE (unroutable[1]))
1251             {
1252               error[1] =
1253                 !ip6_urpf_loose_check (im, b[1],
1254                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1255                 : error[1];
1256             }
1257
1258           vnet_buffer (b[0])->ip.fib_index =
1259             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1260             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1261             vnet_buffer (b[0])->ip.fib_index;
1262           vnet_buffer (b[1])->ip.fib_index =
1263             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1264             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1265             vnet_buffer (b[1])->ip.fib_index;
1266         }                       /* head_of_feature_arc */
1267
1268       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1269       next[0] =
1270         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1271       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1272       next[1] =
1273         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1274
1275       b[0]->error = error_node->errors[0];
1276       b[1]->error = error_node->errors[1];
1277
1278       if (head_of_feature_arc)
1279         {
1280           u8 ip6_unknown[2];
1281           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1282           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1283           if (PREDICT_TRUE (ip6_unknown[0]))
1284             {
1285               u32 next32 = next[0];
1286               vnet_feature_arc_start (arc_index,
1287                                       vnet_buffer (b[0])->sw_if_index
1288                                       [VLIB_RX], &next32, b[0]);
1289               next[0] = next32;
1290             }
1291           if (PREDICT_TRUE (ip6_unknown[1]))
1292             {
1293               u32 next32 = next[1];
1294               vnet_feature_arc_start (arc_index,
1295                                       vnet_buffer (b[1])->sw_if_index
1296                                       [VLIB_RX], &next32, b[1]);
1297               next[1] = next32;
1298             }
1299         }
1300
1301       /* next */
1302       b += 2;
1303       next += 2;
1304       n_left_from -= 2;
1305     }
1306
1307   while (n_left_from)
1308     {
1309       u8 error;
1310       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1311
1312       ip6_header_t *ip;
1313       ip = vlib_buffer_get_current (b[0]);
1314
1315       if (head_of_feature_arc)
1316         {
1317           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1318           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1319
1320           u32 flags = b[0]->flags;
1321           u32 good_l4_csum =
1322             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1323                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1324                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1325
1326           u32 udp_offset;
1327           i16 len_diff = 0;
1328           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1329           if (PREDICT_TRUE (is_tcp_udp))
1330             {
1331               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1332               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1333               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1334                 && udp->checksum == 0;
1335               /* optimistically verify UDP length. */
1336               u16 ip_len, udp_len;
1337               ip_len = clib_net_to_host_u16 (ip->payload_length);
1338               udp_len = clib_net_to_host_u16 (udp->length);
1339               len_diff = ip_len - udp_len;
1340             }
1341
1342           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1343           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1344
1345           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1346             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1347           if (PREDICT_FALSE (need_csum))
1348             {
1349               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1350               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1351             }
1352
1353           error = IP6_ERROR_UNKNOWN_PROTOCOL;
1354           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1355
1356           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1357                          IP6_ERROR_UDP_CHECKSUM,
1358                          "Wrong IP6 errors constants");
1359           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1360                          IP6_ERROR_ICMP_CHECKSUM,
1361                          "Wrong IP6 errors constants");
1362
1363           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1364
1365           /* Drop packets from unroutable hosts. */
1366           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1367           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1368             && type != IP_BUILTIN_PROTOCOL_ICMP
1369             && !ip6_address_is_link_local_unicast (&ip->src_address);
1370           if (PREDICT_FALSE (unroutable))
1371             {
1372               error =
1373                 !ip6_urpf_loose_check (im, b[0],
1374                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1375                 error;
1376             }
1377
1378           vnet_buffer (b[0])->ip.fib_index =
1379             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1380             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1381             vnet_buffer (b[0])->ip.fib_index;
1382         }                       /* head_of_feature_arc */
1383
1384       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1385       next[0] =
1386         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1387
1388       b[0]->error = error_node->errors[0];
1389
1390       if (head_of_feature_arc)
1391         {
1392           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1393             {
1394               u32 next32 = next[0];
1395               vnet_feature_arc_start (arc_index,
1396                                       vnet_buffer (b[0])->sw_if_index
1397                                       [VLIB_RX], &next32, b[0]);
1398               next[0] = next32;
1399             }
1400         }
1401
1402       /* next */
1403       b += 1;
1404       next += 1;
1405       n_left_from -= 1;
1406     }
1407
1408   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1409   return frame->n_vectors;
1410 }
1411
1412 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1413                                vlib_frame_t * frame)
1414 {
1415   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1416 }
1417
1418 /* *INDENT-OFF* */
1419 VLIB_REGISTER_NODE (ip6_local_node) =
1420 {
1421   .name = "ip6-local",
1422   .vector_size = sizeof (u32),
1423   .format_trace = format_ip6_forward_next_trace,
1424   .n_next_nodes = IP_LOCAL_N_NEXT,
1425   .next_nodes =
1426   {
1427     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1428     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1429     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1430     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1431     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-reassembly",
1432   },
1433 };
1434 /* *INDENT-ON* */
1435
1436 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1437                                           vlib_node_runtime_t * node,
1438                                           vlib_frame_t * frame)
1439 {
1440   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1441 }
1442
1443 /* *INDENT-OFF* */
1444 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1445   .name = "ip6-local-end-of-arc",
1446   .vector_size = sizeof (u32),
1447
1448   .format_trace = format_ip6_forward_next_trace,
1449   .sibling_of = "ip6-local",
1450 };
1451
1452 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1453   .arc_name = "ip6-local",
1454   .node_name = "ip6-local-end-of-arc",
1455   .runs_before = 0, /* not before any other features */
1456 };
1457 /* *INDENT-ON* */
1458
1459 #ifdef CLIB_MARCH_VARIANT
1460 extern vlib_node_registration_t ip6_local_node;
1461
1462 #else
1463
1464 void
1465 ip6_register_protocol (u32 protocol, u32 node_index)
1466 {
1467   vlib_main_t *vm = vlib_get_main ();
1468   ip6_main_t *im = &ip6_main;
1469   ip_lookup_main_t *lm = &im->lookup_main;
1470
1471   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1472   lm->local_next_by_ip_protocol[protocol] =
1473     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1474 }
1475
1476 clib_error_t *
1477 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1478                     u8 refresh)
1479 {
1480   vnet_main_t *vnm = vnet_get_main ();
1481   ip6_main_t *im = &ip6_main;
1482   icmp6_neighbor_solicitation_header_t *h;
1483   ip6_address_t *src;
1484   ip_interface_address_t *ia;
1485   ip_adjacency_t *adj;
1486   vnet_hw_interface_t *hi;
1487   vnet_sw_interface_t *si;
1488   vlib_buffer_t *b;
1489   adj_index_t ai;
1490   u32 bi = 0;
1491   int bogus_length;
1492
1493   si = vnet_get_sw_interface (vnm, sw_if_index);
1494
1495   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1496     {
1497       return clib_error_return (0, "%U: interface %U down",
1498                                 format_ip6_address, dst,
1499                                 format_vnet_sw_if_index_name, vnm,
1500                                 sw_if_index);
1501     }
1502
1503   src =
1504     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1505   if (!src)
1506     {
1507       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1508       return clib_error_return
1509         (0, "no matching interface address for destination %U (interface %U)",
1510          format_ip6_address, dst,
1511          format_vnet_sw_if_index_name, vnm, sw_if_index);
1512     }
1513
1514   h =
1515     vlib_packet_template_get_packet (vm,
1516                                      &im->discover_neighbor_packet_template,
1517                                      &bi);
1518   if (!h)
1519     return clib_error_return (0, "ICMP6 NS packet allocation failed");
1520
1521   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1522
1523   /* Destination address is a solicited node multicast address.  We need to fill in
1524      the low 24 bits with low 24 bits of target's address. */
1525   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1526   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1527   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1528
1529   h->ip.src_address = src[0];
1530   h->neighbor.target_address = dst[0];
1531
1532   if (PREDICT_FALSE (!hi->hw_address))
1533     {
1534       return clib_error_return (0, "%U: interface %U do not support ip probe",
1535                                 format_ip6_address, dst,
1536                                 format_vnet_sw_if_index_name, vnm,
1537                                 sw_if_index);
1538     }
1539
1540   clib_memcpy_fast (h->link_layer_option.ethernet_address, hi->hw_address,
1541                     vec_len (hi->hw_address));
1542
1543   h->neighbor.icmp.checksum =
1544     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1545   ASSERT (bogus_length == 0);
1546
1547   b = vlib_get_buffer (vm, bi);
1548   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1549     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1550
1551   /* Add encapsulation string for software interface (e.g. ethernet header). */
1552   ip46_address_t nh = {
1553     .ip6 = *dst,
1554   };
1555
1556   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1557                             VNET_LINK_IP6, &nh, sw_if_index);
1558   adj = adj_get (ai);
1559
1560   /* Peer has been previously resolved, retrieve glean adj instead */
1561   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1562     {
1563       adj_unlock (ai);
1564       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1565                                   VNET_LINK_IP6, sw_if_index, &nh);
1566       adj = adj_get (ai);
1567     }
1568
1569   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1570   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1571
1572   {
1573     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1574     u32 *to_next = vlib_frame_vector_args (f);
1575     to_next[0] = bi;
1576     f->n_vectors = 1;
1577     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1578   }
1579
1580   adj_unlock (ai);
1581   return /* no error */ 0;
1582 }
1583 #endif
1584
1585 typedef enum
1586 {
1587   IP6_REWRITE_NEXT_DROP,
1588   IP6_REWRITE_NEXT_ICMP_ERROR,
1589   IP6_REWRITE_NEXT_FRAGMENT,
1590   IP6_REWRITE_N_NEXT            /* Last */
1591 } ip6_rewrite_next_t;
1592
1593 /**
1594  * This bits of an IPv6 address to mask to construct a multicast
1595  * MAC address
1596  */
1597 #define IP6_MCAST_ADDR_MASK 0xffffffff
1598
1599 always_inline void
1600 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1601                u16 adj_packet_bytes, bool is_locally_generated,
1602                u32 * next, u32 * error)
1603 {
1604   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1605     {
1606       if (is_locally_generated)
1607         {
1608           /* IP fragmentation */
1609           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1610                                    IP6_FRAG_NEXT_IP6_REWRITE, 0);
1611           *next = IP6_REWRITE_NEXT_FRAGMENT;
1612           *error = IP6_ERROR_MTU_EXCEEDED;
1613         }
1614       else
1615         {
1616           *error = IP6_ERROR_MTU_EXCEEDED;
1617           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1618                                        adj_packet_bytes);
1619           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1620         }
1621     }
1622 }
1623
1624 always_inline uword
1625 ip6_rewrite_inline (vlib_main_t * vm,
1626                     vlib_node_runtime_t * node,
1627                     vlib_frame_t * frame,
1628                     int do_counters, int is_midchain, int is_mcast)
1629 {
1630   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1631   u32 *from = vlib_frame_vector_args (frame);
1632   u32 n_left_from, n_left_to_next, *to_next, next_index;
1633   vlib_node_runtime_t *error_node =
1634     vlib_node_get_runtime (vm, ip6_input_node.index);
1635
1636   n_left_from = frame->n_vectors;
1637   next_index = node->cached_next_index;
1638   u32 thread_index = vm->thread_index;
1639
1640   while (n_left_from > 0)
1641     {
1642       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1643
1644       while (n_left_from >= 4 && n_left_to_next >= 2)
1645         {
1646           ip_adjacency_t *adj0, *adj1;
1647           vlib_buffer_t *p0, *p1;
1648           ip6_header_t *ip0, *ip1;
1649           u32 pi0, rw_len0, next0, error0, adj_index0;
1650           u32 pi1, rw_len1, next1, error1, adj_index1;
1651           u32 tx_sw_if_index0, tx_sw_if_index1;
1652           bool is_locally_originated0, is_locally_originated1;
1653
1654           /* Prefetch next iteration. */
1655           {
1656             vlib_buffer_t *p2, *p3;
1657
1658             p2 = vlib_get_buffer (vm, from[2]);
1659             p3 = vlib_get_buffer (vm, from[3]);
1660
1661             vlib_prefetch_buffer_header (p2, LOAD);
1662             vlib_prefetch_buffer_header (p3, LOAD);
1663
1664             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1665             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1666
1667             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1668             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1669           }
1670
1671           pi0 = to_next[0] = from[0];
1672           pi1 = to_next[1] = from[1];
1673
1674           from += 2;
1675           n_left_from -= 2;
1676           to_next += 2;
1677           n_left_to_next -= 2;
1678
1679           p0 = vlib_get_buffer (vm, pi0);
1680           p1 = vlib_get_buffer (vm, pi1);
1681
1682           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1683           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1684
1685           ip0 = vlib_buffer_get_current (p0);
1686           ip1 = vlib_buffer_get_current (p1);
1687
1688           error0 = error1 = IP6_ERROR_NONE;
1689           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1690
1691           is_locally_originated0 =
1692             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1693           if (PREDICT_TRUE (!is_locally_originated0))
1694             {
1695               i32 hop_limit0 = ip0->hop_limit;
1696
1697               /* Input node should have reject packets with hop limit 0. */
1698               ASSERT (ip0->hop_limit > 0);
1699
1700               hop_limit0 -= 1;
1701
1702               ip0->hop_limit = hop_limit0;
1703
1704               /*
1705                * If the hop count drops below 1 when forwarding, generate
1706                * an ICMP response.
1707                */
1708               if (PREDICT_FALSE (hop_limit0 <= 0))
1709                 {
1710                   error0 = IP6_ERROR_TIME_EXPIRED;
1711                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1712                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1713                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1714                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1715                                                0);
1716                 }
1717             }
1718           else
1719             {
1720               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1721             }
1722           is_locally_originated1 =
1723             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1724           if (PREDICT_TRUE (!is_locally_originated1))
1725             {
1726               i32 hop_limit1 = ip1->hop_limit;
1727
1728               /* Input node should have reject packets with hop limit 0. */
1729               ASSERT (ip1->hop_limit > 0);
1730
1731               hop_limit1 -= 1;
1732
1733               ip1->hop_limit = hop_limit1;
1734
1735               /*
1736                * If the hop count drops below 1 when forwarding, generate
1737                * an ICMP response.
1738                */
1739               if (PREDICT_FALSE (hop_limit1 <= 0))
1740                 {
1741                   error1 = IP6_ERROR_TIME_EXPIRED;
1742                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1743                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1744                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1745                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1746                                                0);
1747                 }
1748             }
1749           else
1750             {
1751               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1752             }
1753           adj0 = adj_get (adj_index0);
1754           adj1 = adj_get (adj_index1);
1755
1756           rw_len0 = adj0[0].rewrite_header.data_bytes;
1757           rw_len1 = adj1[0].rewrite_header.data_bytes;
1758           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1759           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1760
1761           if (do_counters)
1762             {
1763               vlib_increment_combined_counter
1764                 (&adjacency_counters,
1765                  thread_index, adj_index0, 1,
1766                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1767               vlib_increment_combined_counter
1768                 (&adjacency_counters,
1769                  thread_index, adj_index1, 1,
1770                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1771             }
1772
1773           /* Check MTU of outgoing interface. */
1774           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1775                          sizeof (ip6_header_t),
1776                          adj0[0].rewrite_header.max_l3_packet_bytes,
1777                          is_locally_originated0, &next0, &error0);
1778           ip6_mtu_check (p1, clib_net_to_host_u16 (ip1->payload_length) +
1779                          sizeof (ip6_header_t),
1780                          adj1[0].rewrite_header.max_l3_packet_bytes,
1781                          is_locally_originated1, &next1, &error1);
1782
1783           /* Don't adjust the buffer for hop count issue; icmp-error node
1784            * wants to see the IP headerr */
1785           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1786             {
1787               p0->current_data -= rw_len0;
1788               p0->current_length += rw_len0;
1789
1790               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1791               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1792               next0 = adj0[0].rewrite_header.next_index;
1793
1794               if (PREDICT_FALSE
1795                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1796                 vnet_feature_arc_start (lm->output_feature_arc_index,
1797                                         tx_sw_if_index0, &next0, p0);
1798             }
1799           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1800             {
1801               p1->current_data -= rw_len1;
1802               p1->current_length += rw_len1;
1803
1804               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1805               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1806               next1 = adj1[0].rewrite_header.next_index;
1807
1808               if (PREDICT_FALSE
1809                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1810                 vnet_feature_arc_start (lm->output_feature_arc_index,
1811                                         tx_sw_if_index1, &next1, p1);
1812             }
1813
1814           /* Guess we are only writing on simple Ethernet header. */
1815           vnet_rewrite_two_headers (adj0[0], adj1[0],
1816                                     ip0, ip1, sizeof (ethernet_header_t));
1817
1818           if (is_midchain)
1819             {
1820               adj0->sub_type.midchain.fixup_func
1821                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1822               adj1->sub_type.midchain.fixup_func
1823                 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1824             }
1825           if (is_mcast)
1826             {
1827               /*
1828                * copy bytes from the IP address into the MAC rewrite
1829                */
1830               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1831                                           adj0->
1832                                           rewrite_header.dst_mcast_offset,
1833                                           &ip0->dst_address.as_u32[3],
1834                                           (u8 *) ip0);
1835               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1836                                           adj1->
1837                                           rewrite_header.dst_mcast_offset,
1838                                           &ip1->dst_address.as_u32[3],
1839                                           (u8 *) ip1);
1840             }
1841
1842           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1843                                            to_next, n_left_to_next,
1844                                            pi0, pi1, next0, next1);
1845         }
1846
1847       while (n_left_from > 0 && n_left_to_next > 0)
1848         {
1849           ip_adjacency_t *adj0;
1850           vlib_buffer_t *p0;
1851           ip6_header_t *ip0;
1852           u32 pi0, rw_len0;
1853           u32 adj_index0, next0, error0;
1854           u32 tx_sw_if_index0;
1855           bool is_locally_originated0;
1856
1857           pi0 = to_next[0] = from[0];
1858
1859           p0 = vlib_get_buffer (vm, pi0);
1860
1861           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1862
1863           adj0 = adj_get (adj_index0);
1864
1865           ip0 = vlib_buffer_get_current (p0);
1866
1867           error0 = IP6_ERROR_NONE;
1868           next0 = IP6_REWRITE_NEXT_DROP;
1869
1870           /* Check hop limit */
1871           is_locally_originated0 =
1872             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1873           if (PREDICT_TRUE (!is_locally_originated0))
1874             {
1875               i32 hop_limit0 = ip0->hop_limit;
1876
1877               ASSERT (ip0->hop_limit > 0);
1878
1879               hop_limit0 -= 1;
1880
1881               ip0->hop_limit = hop_limit0;
1882
1883               if (PREDICT_FALSE (hop_limit0 <= 0))
1884                 {
1885                   /*
1886                    * If the hop count drops below 1 when forwarding, generate
1887                    * an ICMP response.
1888                    */
1889                   error0 = IP6_ERROR_TIME_EXPIRED;
1890                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1891                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1892                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1893                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1894                                                0);
1895                 }
1896             }
1897           else
1898             {
1899               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1900             }
1901
1902           /* Guess we are only writing on simple Ethernet header. */
1903           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1904
1905           /* Update packet buffer attributes/set output interface. */
1906           rw_len0 = adj0[0].rewrite_header.data_bytes;
1907           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1908
1909           if (do_counters)
1910             {
1911               vlib_increment_combined_counter
1912                 (&adjacency_counters,
1913                  thread_index, adj_index0, 1,
1914                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1915             }
1916
1917           /* Check MTU of outgoing interface. */
1918           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1919                          sizeof (ip6_header_t),
1920                          adj0[0].rewrite_header.max_l3_packet_bytes,
1921                          is_locally_originated0, &next0, &error0);
1922
1923           /* Don't adjust the buffer for hop count issue; icmp-error node
1924            * wants to see the IP header */
1925           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1926             {
1927               p0->current_data -= rw_len0;
1928               p0->current_length += rw_len0;
1929
1930               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1931
1932               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1933               next0 = adj0[0].rewrite_header.next_index;
1934
1935               if (PREDICT_FALSE
1936                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1937                 vnet_feature_arc_start (lm->output_feature_arc_index,
1938                                         tx_sw_if_index0, &next0, p0);
1939             }
1940
1941           if (is_midchain)
1942             {
1943               adj0->sub_type.midchain.fixup_func
1944                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1945             }
1946           if (is_mcast)
1947             {
1948               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1949                                           adj0->
1950                                           rewrite_header.dst_mcast_offset,
1951                                           &ip0->dst_address.as_u32[3],
1952                                           (u8 *) ip0);
1953             }
1954
1955           p0->error = error_node->errors[error0];
1956
1957           from += 1;
1958           n_left_from -= 1;
1959           to_next += 1;
1960           n_left_to_next -= 1;
1961
1962           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1963                                            to_next, n_left_to_next,
1964                                            pi0, next0);
1965         }
1966
1967       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1968     }
1969
1970   /* Need to do trace after rewrites to pick up new packet data. */
1971   if (node->flags & VLIB_NODE_FLAG_TRACE)
1972     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1973
1974   return frame->n_vectors;
1975 }
1976
1977 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
1978                                  vlib_node_runtime_t * node,
1979                                  vlib_frame_t * frame)
1980 {
1981   if (adj_are_counters_enabled ())
1982     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1983   else
1984     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1985 }
1986
1987 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
1988                                        vlib_node_runtime_t * node,
1989                                        vlib_frame_t * frame)
1990 {
1991   if (adj_are_counters_enabled ())
1992     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1993   else
1994     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1995 }
1996
1997 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
1998                                        vlib_node_runtime_t * node,
1999                                        vlib_frame_t * frame)
2000 {
2001   if (adj_are_counters_enabled ())
2002     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2003   else
2004     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2005 }
2006
2007 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2008                                   vlib_node_runtime_t * node,
2009                                   vlib_frame_t * frame)
2010 {
2011   if (adj_are_counters_enabled ())
2012     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2013   else
2014     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2015 }
2016
2017 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2018                                         vlib_node_runtime_t * node,
2019                                         vlib_frame_t * frame)
2020 {
2021   if (adj_are_counters_enabled ())
2022     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2023   else
2024     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2025 }
2026
2027 /* *INDENT-OFF* */
2028 VLIB_REGISTER_NODE (ip6_midchain_node) =
2029 {
2030   .name = "ip6-midchain",
2031   .vector_size = sizeof (u32),
2032   .format_trace = format_ip6_forward_next_trace,
2033   .sibling_of = "ip6-rewrite",
2034   };
2035
2036 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2037 {
2038   .name = "ip6-rewrite",
2039   .vector_size = sizeof (u32),
2040   .format_trace = format_ip6_rewrite_trace,
2041   .n_next_nodes = IP6_REWRITE_N_NEXT,
2042   .next_nodes =
2043   {
2044     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2045     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2046     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2047   },
2048 };
2049
2050 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2051   .name = "ip6-rewrite-bcast",
2052   .vector_size = sizeof (u32),
2053
2054   .format_trace = format_ip6_rewrite_trace,
2055   .sibling_of = "ip6-rewrite",
2056 };
2057
2058 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2059 {
2060   .name = "ip6-rewrite-mcast",
2061   .vector_size = sizeof (u32),
2062   .format_trace = format_ip6_rewrite_trace,
2063   .sibling_of = "ip6-rewrite",
2064 };
2065
2066
2067 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2068 {
2069   .name = "ip6-mcast-midchain",
2070   .vector_size = sizeof (u32),
2071   .format_trace = format_ip6_rewrite_trace,
2072   .sibling_of = "ip6-rewrite",
2073 };
2074
2075 /* *INDENT-ON* */
2076
2077 /*
2078  * Hop-by-Hop handling
2079  */
2080 #ifndef CLIB_MARCH_VARIANT
2081 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2082 #endif /* CLIB_MARCH_VARIANT */
2083
2084 #define foreach_ip6_hop_by_hop_error \
2085 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2086 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2087 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2088
2089 /* *INDENT-OFF* */
2090 typedef enum
2091 {
2092 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2093   foreach_ip6_hop_by_hop_error
2094 #undef _
2095   IP6_HOP_BY_HOP_N_ERROR,
2096 } ip6_hop_by_hop_error_t;
2097 /* *INDENT-ON* */
2098
2099 /*
2100  * Primary h-b-h handler trace support
2101  * We work pretty hard on the problem for obvious reasons
2102  */
2103 typedef struct
2104 {
2105   u32 next_index;
2106   u32 trace_len;
2107   u8 option_data[256];
2108 } ip6_hop_by_hop_trace_t;
2109
2110 extern vlib_node_registration_t ip6_hop_by_hop_node;
2111
2112 static char *ip6_hop_by_hop_error_strings[] = {
2113 #define _(sym,string) string,
2114   foreach_ip6_hop_by_hop_error
2115 #undef _
2116 };
2117
2118 #ifndef CLIB_MARCH_VARIANT
2119 u8 *
2120 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2121 {
2122   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2123   int total_len = va_arg (*args, int);
2124   ip6_hop_by_hop_option_t *opt0, *limit0;
2125   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2126   u8 type0;
2127
2128   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2129               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2130
2131   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2132   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2133
2134   while (opt0 < limit0)
2135     {
2136       type0 = opt0->type;
2137       switch (type0)
2138         {
2139         case 0:         /* Pad, just stop */
2140           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2141           break;
2142
2143         default:
2144           if (hm->trace[type0])
2145             {
2146               s = (*hm->trace[type0]) (s, opt0);
2147             }
2148           else
2149             {
2150               s =
2151                 format (s, "\n    unrecognized option %d length %d", type0,
2152                         opt0->length);
2153             }
2154           opt0 =
2155             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2156                                          sizeof (ip6_hop_by_hop_option_t));
2157           break;
2158         }
2159     }
2160   return s;
2161 }
2162 #endif
2163
2164 static u8 *
2165 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2166 {
2167   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2168   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2169   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2170   ip6_hop_by_hop_header_t *hbh0;
2171   ip6_hop_by_hop_option_t *opt0, *limit0;
2172   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2173
2174   u8 type0;
2175
2176   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2177
2178   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2179               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2180
2181   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2182   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2183
2184   while (opt0 < limit0)
2185     {
2186       type0 = opt0->type;
2187       switch (type0)
2188         {
2189         case 0:         /* Pad, just stop */
2190           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2191           break;
2192
2193         default:
2194           if (hm->trace[type0])
2195             {
2196               s = (*hm->trace[type0]) (s, opt0);
2197             }
2198           else
2199             {
2200               s =
2201                 format (s, "\n    unrecognized option %d length %d", type0,
2202                         opt0->length);
2203             }
2204           opt0 =
2205             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2206                                          sizeof (ip6_hop_by_hop_option_t));
2207           break;
2208         }
2209     }
2210   return s;
2211 }
2212
2213 always_inline u8
2214 ip6_scan_hbh_options (vlib_buffer_t * b0,
2215                       ip6_header_t * ip0,
2216                       ip6_hop_by_hop_header_t * hbh0,
2217                       ip6_hop_by_hop_option_t * opt0,
2218                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2219 {
2220   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2221   u8 type0;
2222   u8 error0 = 0;
2223
2224   while (opt0 < limit0)
2225     {
2226       type0 = opt0->type;
2227       switch (type0)
2228         {
2229         case 0:         /* Pad1 */
2230           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2231           continue;
2232         case 1:         /* PadN */
2233           break;
2234         default:
2235           if (hm->options[type0])
2236             {
2237               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2238                 {
2239                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2240                   return (error0);
2241                 }
2242             }
2243           else
2244             {
2245               /* Unrecognized mandatory option, check the two high order bits */
2246               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2247                 {
2248                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2249                   break;
2250                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2251                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2252                   *next0 = IP_LOOKUP_NEXT_DROP;
2253                   break;
2254                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2255                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2256                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2257                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2258                                                ICMP6_parameter_problem_unrecognized_option,
2259                                                (u8 *) opt0 - (u8 *) ip0);
2260                   break;
2261                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2262                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2263                   if (!ip6_address_is_multicast (&ip0->dst_address))
2264                     {
2265                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2266                       icmp6_error_set_vnet_buffer (b0,
2267                                                    ICMP6_parameter_problem,
2268                                                    ICMP6_parameter_problem_unrecognized_option,
2269                                                    (u8 *) opt0 - (u8 *) ip0);
2270                     }
2271                   else
2272                     {
2273                       *next0 = IP_LOOKUP_NEXT_DROP;
2274                     }
2275                   break;
2276                 }
2277               return (error0);
2278             }
2279         }
2280       opt0 =
2281         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2282                                      sizeof (ip6_hop_by_hop_option_t));
2283     }
2284   return (error0);
2285 }
2286
2287 /*
2288  * Process the Hop-by-Hop Options header
2289  */
2290 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2291                                     vlib_node_runtime_t * node,
2292                                     vlib_frame_t * frame)
2293 {
2294   vlib_node_runtime_t *error_node =
2295     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2296   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2297   u32 n_left_from, *from, *to_next;
2298   ip_lookup_next_t next_index;
2299
2300   from = vlib_frame_vector_args (frame);
2301   n_left_from = frame->n_vectors;
2302   next_index = node->cached_next_index;
2303
2304   while (n_left_from > 0)
2305     {
2306       u32 n_left_to_next;
2307
2308       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2309
2310       while (n_left_from >= 4 && n_left_to_next >= 2)
2311         {
2312           u32 bi0, bi1;
2313           vlib_buffer_t *b0, *b1;
2314           u32 next0, next1;
2315           ip6_header_t *ip0, *ip1;
2316           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2317           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2318           u8 error0 = 0, error1 = 0;
2319
2320           /* Prefetch next iteration. */
2321           {
2322             vlib_buffer_t *p2, *p3;
2323
2324             p2 = vlib_get_buffer (vm, from[2]);
2325             p3 = vlib_get_buffer (vm, from[3]);
2326
2327             vlib_prefetch_buffer_header (p2, LOAD);
2328             vlib_prefetch_buffer_header (p3, LOAD);
2329
2330             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2331             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2332           }
2333
2334           /* Speculatively enqueue b0, b1 to the current next frame */
2335           to_next[0] = bi0 = from[0];
2336           to_next[1] = bi1 = from[1];
2337           from += 2;
2338           to_next += 2;
2339           n_left_from -= 2;
2340           n_left_to_next -= 2;
2341
2342           b0 = vlib_get_buffer (vm, bi0);
2343           b1 = vlib_get_buffer (vm, bi1);
2344
2345           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2346           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2347           ip_adjacency_t *adj0 = adj_get (adj_index0);
2348           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2349           ip_adjacency_t *adj1 = adj_get (adj_index1);
2350
2351           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2352           next0 = adj0->lookup_next_index;
2353           next1 = adj1->lookup_next_index;
2354
2355           ip0 = vlib_buffer_get_current (b0);
2356           ip1 = vlib_buffer_get_current (b1);
2357           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2358           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2359           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2360           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2361           limit0 =
2362             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2363                                          ((hbh0->length + 1) << 3));
2364           limit1 =
2365             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2366                                          ((hbh1->length + 1) << 3));
2367
2368           /*
2369            * Basic validity checks
2370            */
2371           if ((hbh0->length + 1) << 3 >
2372               clib_net_to_host_u16 (ip0->payload_length))
2373             {
2374               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2375               next0 = IP_LOOKUP_NEXT_DROP;
2376               goto outdual;
2377             }
2378           /* Scan the set of h-b-h options, process ones that we understand */
2379           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2380
2381           if ((hbh1->length + 1) << 3 >
2382               clib_net_to_host_u16 (ip1->payload_length))
2383             {
2384               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2385               next1 = IP_LOOKUP_NEXT_DROP;
2386               goto outdual;
2387             }
2388           /* Scan the set of h-b-h options, process ones that we understand */
2389           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2390
2391         outdual:
2392           /* Has the classifier flagged this buffer for special treatment? */
2393           if (PREDICT_FALSE
2394               ((error0 == 0)
2395                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2396             next0 = hm->next_override;
2397
2398           /* Has the classifier flagged this buffer for special treatment? */
2399           if (PREDICT_FALSE
2400               ((error1 == 0)
2401                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2402             next1 = hm->next_override;
2403
2404           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2405             {
2406               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2407                 {
2408                   ip6_hop_by_hop_trace_t *t =
2409                     vlib_add_trace (vm, node, b0, sizeof (*t));
2410                   u32 trace_len = (hbh0->length + 1) << 3;
2411                   t->next_index = next0;
2412                   /* Capture the h-b-h option verbatim */
2413                   trace_len =
2414                     trace_len <
2415                     ARRAY_LEN (t->option_data) ? trace_len :
2416                     ARRAY_LEN (t->option_data);
2417                   t->trace_len = trace_len;
2418                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2419                 }
2420               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2421                 {
2422                   ip6_hop_by_hop_trace_t *t =
2423                     vlib_add_trace (vm, node, b1, sizeof (*t));
2424                   u32 trace_len = (hbh1->length + 1) << 3;
2425                   t->next_index = next1;
2426                   /* Capture the h-b-h option verbatim */
2427                   trace_len =
2428                     trace_len <
2429                     ARRAY_LEN (t->option_data) ? trace_len :
2430                     ARRAY_LEN (t->option_data);
2431                   t->trace_len = trace_len;
2432                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2433                 }
2434
2435             }
2436
2437           b0->error = error_node->errors[error0];
2438           b1->error = error_node->errors[error1];
2439
2440           /* verify speculative enqueue, maybe switch current next frame */
2441           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2442                                            n_left_to_next, bi0, bi1, next0,
2443                                            next1);
2444         }
2445
2446       while (n_left_from > 0 && n_left_to_next > 0)
2447         {
2448           u32 bi0;
2449           vlib_buffer_t *b0;
2450           u32 next0;
2451           ip6_header_t *ip0;
2452           ip6_hop_by_hop_header_t *hbh0;
2453           ip6_hop_by_hop_option_t *opt0, *limit0;
2454           u8 error0 = 0;
2455
2456           /* Speculatively enqueue b0 to the current next frame */
2457           bi0 = from[0];
2458           to_next[0] = bi0;
2459           from += 1;
2460           to_next += 1;
2461           n_left_from -= 1;
2462           n_left_to_next -= 1;
2463
2464           b0 = vlib_get_buffer (vm, bi0);
2465           /*
2466            * Default use the next_index from the adjacency.
2467            * A HBH option rarely redirects to a different node
2468            */
2469           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2470           ip_adjacency_t *adj0 = adj_get (adj_index0);
2471           next0 = adj0->lookup_next_index;
2472
2473           ip0 = vlib_buffer_get_current (b0);
2474           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2475           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2476           limit0 =
2477             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2478                                          ((hbh0->length + 1) << 3));
2479
2480           /*
2481            * Basic validity checks
2482            */
2483           if ((hbh0->length + 1) << 3 >
2484               clib_net_to_host_u16 (ip0->payload_length))
2485             {
2486               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2487               next0 = IP_LOOKUP_NEXT_DROP;
2488               goto out0;
2489             }
2490
2491           /* Scan the set of h-b-h options, process ones that we understand */
2492           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2493
2494         out0:
2495           /* Has the classifier flagged this buffer for special treatment? */
2496           if (PREDICT_FALSE
2497               ((error0 == 0)
2498                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2499             next0 = hm->next_override;
2500
2501           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2502             {
2503               ip6_hop_by_hop_trace_t *t =
2504                 vlib_add_trace (vm, node, b0, sizeof (*t));
2505               u32 trace_len = (hbh0->length + 1) << 3;
2506               t->next_index = next0;
2507               /* Capture the h-b-h option verbatim */
2508               trace_len =
2509                 trace_len <
2510                 ARRAY_LEN (t->option_data) ? trace_len :
2511                 ARRAY_LEN (t->option_data);
2512               t->trace_len = trace_len;
2513               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2514             }
2515
2516           b0->error = error_node->errors[error0];
2517
2518           /* verify speculative enqueue, maybe switch current next frame */
2519           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2520                                            n_left_to_next, bi0, next0);
2521         }
2522       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2523     }
2524   return frame->n_vectors;
2525 }
2526
2527 /* *INDENT-OFF* */
2528 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2529 {
2530   .name = "ip6-hop-by-hop",
2531   .sibling_of = "ip6-lookup",
2532   .vector_size = sizeof (u32),
2533   .format_trace = format_ip6_hop_by_hop_trace,
2534   .type = VLIB_NODE_TYPE_INTERNAL,
2535   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2536   .error_strings = ip6_hop_by_hop_error_strings,
2537   .n_next_nodes = 0,
2538 };
2539 /* *INDENT-ON* */
2540
2541 static clib_error_t *
2542 ip6_hop_by_hop_init (vlib_main_t * vm)
2543 {
2544   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2545   clib_memset (hm->options, 0, sizeof (hm->options));
2546   clib_memset (hm->trace, 0, sizeof (hm->trace));
2547   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2548   return (0);
2549 }
2550
2551 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2552
2553 #ifndef CLIB_MARCH_VARIANT
2554 void
2555 ip6_hbh_set_next_override (uword next)
2556 {
2557   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2558
2559   hm->next_override = next;
2560 }
2561
2562 int
2563 ip6_hbh_register_option (u8 option,
2564                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2565                                       ip6_hop_by_hop_option_t * opt),
2566                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2567 {
2568   ip6_main_t *im = &ip6_main;
2569   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2570
2571   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2572
2573   /* Already registered */
2574   if (hm->options[option])
2575     return (-1);
2576
2577   hm->options[option] = options;
2578   hm->trace[option] = trace;
2579
2580   /* Set global variable */
2581   im->hbh_enabled = 1;
2582
2583   return (0);
2584 }
2585
2586 int
2587 ip6_hbh_unregister_option (u8 option)
2588 {
2589   ip6_main_t *im = &ip6_main;
2590   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2591
2592   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2593
2594   /* Not registered */
2595   if (!hm->options[option])
2596     return (-1);
2597
2598   hm->options[option] = NULL;
2599   hm->trace[option] = NULL;
2600
2601   /* Disable global knob if this was the last option configured */
2602   int i;
2603   bool found = false;
2604   for (i = 0; i < 256; i++)
2605     {
2606       if (hm->options[option])
2607         {
2608           found = true;
2609           break;
2610         }
2611     }
2612   if (!found)
2613     im->hbh_enabled = 0;
2614
2615   return (0);
2616 }
2617
2618 /* Global IP6 main. */
2619 ip6_main_t ip6_main;
2620 #endif
2621
2622 static clib_error_t *
2623 ip6_lookup_init (vlib_main_t * vm)
2624 {
2625   ip6_main_t *im = &ip6_main;
2626   clib_error_t *error;
2627   uword i;
2628
2629   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2630     return error;
2631
2632   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2633     {
2634       u32 j, i0, i1;
2635
2636       i0 = i / 32;
2637       i1 = i % 32;
2638
2639       for (j = 0; j < i0; j++)
2640         im->fib_masks[i].as_u32[j] = ~0;
2641
2642       if (i1)
2643         im->fib_masks[i].as_u32[i0] =
2644           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2645     }
2646
2647   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2648
2649   if (im->lookup_table_nbuckets == 0)
2650     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2651
2652   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2653
2654   if (im->lookup_table_size == 0)
2655     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2656
2657   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2658                          "ip6 FIB fwding table",
2659                          im->lookup_table_nbuckets, im->lookup_table_size);
2660   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2661                          "ip6 FIB non-fwding table",
2662                          im->lookup_table_nbuckets, im->lookup_table_size);
2663   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2664                          "ip6 mFIB table",
2665                          im->lookup_table_nbuckets, im->lookup_table_size);
2666
2667   /* Create FIB with index 0 and table id of 0. */
2668   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2669                                      FIB_SOURCE_DEFAULT_ROUTE);
2670   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2671                                       MFIB_SOURCE_DEFAULT_ROUTE);
2672
2673   {
2674     pg_node_t *pn;
2675     pn = pg_get_node (ip6_lookup_node.index);
2676     pn->unformat_edit = unformat_pg_ip6_header;
2677   }
2678
2679   /* Unless explicitly configured, don't process HBH options */
2680   im->hbh_enabled = 0;
2681
2682   {
2683     icmp6_neighbor_solicitation_header_t p;
2684
2685     clib_memset (&p, 0, sizeof (p));
2686
2687     p.ip.ip_version_traffic_class_and_flow_label =
2688       clib_host_to_net_u32 (0x6 << 28);
2689     p.ip.payload_length =
2690       clib_host_to_net_u16 (sizeof (p) -
2691                             STRUCT_OFFSET_OF
2692                             (icmp6_neighbor_solicitation_header_t, neighbor));
2693     p.ip.protocol = IP_PROTOCOL_ICMP6;
2694     p.ip.hop_limit = 255;
2695     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2696
2697     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2698
2699     p.link_layer_option.header.type =
2700       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2701     p.link_layer_option.header.n_data_u64s =
2702       sizeof (p.link_layer_option) / sizeof (u64);
2703
2704     vlib_packet_template_init (vm,
2705                                &im->discover_neighbor_packet_template,
2706                                &p, sizeof (p),
2707                                /* alloc chunk size */ 8,
2708                                "ip6 neighbor discovery");
2709   }
2710
2711   return error;
2712 }
2713
2714 VLIB_INIT_FUNCTION (ip6_lookup_init);
2715
2716 static clib_error_t *
2717 test_ip6_link_command_fn (vlib_main_t * vm,
2718                           unformat_input_t * input, vlib_cli_command_t * cmd)
2719 {
2720   u8 mac[6];
2721   ip6_address_t _a, *a = &_a;
2722
2723   if (unformat (input, "%U", unformat_ethernet_address, mac))
2724     {
2725       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2726       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2727       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2728       vlib_cli_output (vm, "Original MAC address: %U",
2729                        format_ethernet_address, mac);
2730     }
2731
2732   return 0;
2733 }
2734
2735 /*?
2736  * This command converts the given MAC Address into an IPv6 link-local
2737  * address.
2738  *
2739  * @cliexpar
2740  * Example of how to create an IPv6 link-local address:
2741  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2742  * Link local address: fe80::14d9:e0ff:fe91:7986
2743  * Original MAC address: 16:d9:e0:91:79:86
2744  * @cliexend
2745 ?*/
2746 /* *INDENT-OFF* */
2747 VLIB_CLI_COMMAND (test_link_command, static) =
2748 {
2749   .path = "test ip6 link",
2750   .function = test_ip6_link_command_fn,
2751   .short_help = "test ip6 link <mac-address>",
2752 };
2753 /* *INDENT-ON* */
2754
2755 #ifndef CLIB_MARCH_VARIANT
2756 int
2757 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2758 {
2759   u32 fib_index;
2760
2761   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2762
2763   if (~0 == fib_index)
2764     return VNET_API_ERROR_NO_SUCH_FIB;
2765
2766   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2767                                   flow_hash_config);
2768
2769   return 0;
2770 }
2771 #endif
2772
2773 static clib_error_t *
2774 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2775                               unformat_input_t * input,
2776                               vlib_cli_command_t * cmd)
2777 {
2778   int matched = 0;
2779   u32 table_id = 0;
2780   u32 flow_hash_config = 0;
2781   int rv;
2782
2783   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2784     {
2785       if (unformat (input, "table %d", &table_id))
2786         matched = 1;
2787 #define _(a,v) \
2788     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2789       foreach_flow_hash_bit
2790 #undef _
2791         else
2792         break;
2793     }
2794
2795   if (matched == 0)
2796     return clib_error_return (0, "unknown input `%U'",
2797                               format_unformat_error, input);
2798
2799   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2800   switch (rv)
2801     {
2802     case 0:
2803       break;
2804
2805     case -1:
2806       return clib_error_return (0, "no such FIB table %d", table_id);
2807
2808     default:
2809       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2810       break;
2811     }
2812
2813   return 0;
2814 }
2815
2816 /*?
2817  * Configure the set of IPv6 fields used by the flow hash.
2818  *
2819  * @cliexpar
2820  * @parblock
2821  * Example of how to set the flow hash on a given table:
2822  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2823  *
2824  * Example of display the configured flow hash:
2825  * @cliexstart{show ip6 fib}
2826  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2827  * @::/0
2828  *   unicast-ip6-chain
2829  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2830  *     [0] [@0]: dpo-drop ip6
2831  * fe80::/10
2832  *   unicast-ip6-chain
2833  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2834  *     [0] [@2]: dpo-receive
2835  * ff02::1/128
2836  *   unicast-ip6-chain
2837  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2838  *     [0] [@2]: dpo-receive
2839  * ff02::2/128
2840  *   unicast-ip6-chain
2841  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2842  *     [0] [@2]: dpo-receive
2843  * ff02::16/128
2844  *   unicast-ip6-chain
2845  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2846  *     [0] [@2]: dpo-receive
2847  * ff02::1:ff00:0/104
2848  *   unicast-ip6-chain
2849  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2850  *     [0] [@2]: dpo-receive
2851  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2852  * @::/0
2853  *   unicast-ip6-chain
2854  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2855  *     [0] [@0]: dpo-drop ip6
2856  * @::a:1:1:0:4/126
2857  *   unicast-ip6-chain
2858  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2859  *     [0] [@4]: ipv6-glean: af_packet0
2860  * @::a:1:1:0:7/128
2861  *   unicast-ip6-chain
2862  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2863  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2864  * fe80::/10
2865  *   unicast-ip6-chain
2866  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2867  *     [0] [@2]: dpo-receive
2868  * fe80::fe:3eff:fe3e:9222/128
2869  *   unicast-ip6-chain
2870  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2871  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2872  * ff02::1/128
2873  *   unicast-ip6-chain
2874  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2875  *     [0] [@2]: dpo-receive
2876  * ff02::2/128
2877  *   unicast-ip6-chain
2878  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2879  *     [0] [@2]: dpo-receive
2880  * ff02::16/128
2881  *   unicast-ip6-chain
2882  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2883  *     [0] [@2]: dpo-receive
2884  * ff02::1:ff00:0/104
2885  *   unicast-ip6-chain
2886  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2887  *     [0] [@2]: dpo-receive
2888  * @cliexend
2889  * @endparblock
2890 ?*/
2891 /* *INDENT-OFF* */
2892 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2893 {
2894   .path = "set ip6 flow-hash",
2895   .short_help =
2896   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2897   .function = set_ip6_flow_hash_command_fn,
2898 };
2899 /* *INDENT-ON* */
2900
2901 static clib_error_t *
2902 show_ip6_local_command_fn (vlib_main_t * vm,
2903                            unformat_input_t * input, vlib_cli_command_t * cmd)
2904 {
2905   ip6_main_t *im = &ip6_main;
2906   ip_lookup_main_t *lm = &im->lookup_main;
2907   int i;
2908
2909   vlib_cli_output (vm, "Protocols handled by ip6_local");
2910   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2911     {
2912       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2913         {
2914
2915           u32 node_index = vlib_get_node (vm,
2916                                           ip6_local_node.index)->
2917             next_nodes[lm->local_next_by_ip_protocol[i]];
2918           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2919                            node_index);
2920         }
2921     }
2922   return 0;
2923 }
2924
2925
2926
2927 /*?
2928  * Display the set of protocols handled by the local IPv6 stack.
2929  *
2930  * @cliexpar
2931  * Example of how to display local protocol table:
2932  * @cliexstart{show ip6 local}
2933  * Protocols handled by ip6_local
2934  * 17
2935  * 43
2936  * 58
2937  * 115
2938  * @cliexend
2939 ?*/
2940 /* *INDENT-OFF* */
2941 VLIB_CLI_COMMAND (show_ip6_local, static) =
2942 {
2943   .path = "show ip6 local",
2944   .function = show_ip6_local_command_fn,
2945   .short_help = "show ip6 local",
2946 };
2947 /* *INDENT-ON* */
2948
2949 #ifndef CLIB_MARCH_VARIANT
2950 int
2951 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2952                              u32 table_index)
2953 {
2954   vnet_main_t *vnm = vnet_get_main ();
2955   vnet_interface_main_t *im = &vnm->interface_main;
2956   ip6_main_t *ipm = &ip6_main;
2957   ip_lookup_main_t *lm = &ipm->lookup_main;
2958   vnet_classify_main_t *cm = &vnet_classify_main;
2959   ip6_address_t *if_addr;
2960
2961   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2962     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2963
2964   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2965     return VNET_API_ERROR_NO_SUCH_ENTRY;
2966
2967   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2968   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2969
2970   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2971
2972   if (NULL != if_addr)
2973     {
2974       fib_prefix_t pfx = {
2975         .fp_len = 128,
2976         .fp_proto = FIB_PROTOCOL_IP6,
2977         .fp_addr.ip6 = *if_addr,
2978       };
2979       u32 fib_index;
2980
2981       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2982                                                        sw_if_index);
2983
2984
2985       if (table_index != (u32) ~ 0)
2986         {
2987           dpo_id_t dpo = DPO_INVALID;
2988
2989           dpo_set (&dpo,
2990                    DPO_CLASSIFY,
2991                    DPO_PROTO_IP6,
2992                    classify_dpo_create (DPO_PROTO_IP6, table_index));
2993
2994           fib_table_entry_special_dpo_add (fib_index,
2995                                            &pfx,
2996                                            FIB_SOURCE_CLASSIFY,
2997                                            FIB_ENTRY_FLAG_NONE, &dpo);
2998           dpo_reset (&dpo);
2999         }
3000       else
3001         {
3002           fib_table_entry_special_remove (fib_index,
3003                                           &pfx, FIB_SOURCE_CLASSIFY);
3004         }
3005     }
3006
3007   return 0;
3008 }
3009 #endif
3010
3011 static clib_error_t *
3012 set_ip6_classify_command_fn (vlib_main_t * vm,
3013                              unformat_input_t * input,
3014                              vlib_cli_command_t * cmd)
3015 {
3016   u32 table_index = ~0;
3017   int table_index_set = 0;
3018   u32 sw_if_index = ~0;
3019   int rv;
3020
3021   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3022     {
3023       if (unformat (input, "table-index %d", &table_index))
3024         table_index_set = 1;
3025       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3026                          vnet_get_main (), &sw_if_index))
3027         ;
3028       else
3029         break;
3030     }
3031
3032   if (table_index_set == 0)
3033     return clib_error_return (0, "classify table-index must be specified");
3034
3035   if (sw_if_index == ~0)
3036     return clib_error_return (0, "interface / subif must be specified");
3037
3038   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3039
3040   switch (rv)
3041     {
3042     case 0:
3043       break;
3044
3045     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3046       return clib_error_return (0, "No such interface");
3047
3048     case VNET_API_ERROR_NO_SUCH_ENTRY:
3049       return clib_error_return (0, "No such classifier table");
3050     }
3051   return 0;
3052 }
3053
3054 /*?
3055  * Assign a classification table to an interface. The classification
3056  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3057  * commands. Once the table is create, use this command to filter packets
3058  * on an interface.
3059  *
3060  * @cliexpar
3061  * Example of how to assign a classification table to an interface:
3062  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3063 ?*/
3064 /* *INDENT-OFF* */
3065 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3066 {
3067   .path = "set ip6 classify",
3068   .short_help =
3069   "set ip6 classify intfc <interface> table-index <classify-idx>",
3070   .function = set_ip6_classify_command_fn,
3071 };
3072 /* *INDENT-ON* */
3073
3074 static clib_error_t *
3075 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3076 {
3077   ip6_main_t *im = &ip6_main;
3078   uword heapsize = 0;
3079   u32 tmp;
3080   u32 nbuckets = 0;
3081
3082   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3083     {
3084       if (unformat (input, "hash-buckets %d", &tmp))
3085         nbuckets = tmp;
3086       else if (unformat (input, "heap-size %U",
3087                          unformat_memory_size, &heapsize))
3088         ;
3089       else
3090         return clib_error_return (0, "unknown input '%U'",
3091                                   format_unformat_error, input);
3092     }
3093
3094   im->lookup_table_nbuckets = nbuckets;
3095   im->lookup_table_size = heapsize;
3096
3097   return 0;
3098 }
3099
3100 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3101
3102 /*
3103  * fd.io coding-style-patch-verification: ON
3104  *
3105  * Local Variables:
3106  * eval: (c-set-style "gnu")
3107  * End:
3108  */