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_with_gso (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                              int do_gso)
1630 {
1631   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1632   u32 *from = vlib_frame_vector_args (frame);
1633   u32 n_left_from, n_left_to_next, *to_next, next_index;
1634   vlib_node_runtime_t *error_node =
1635     vlib_node_get_runtime (vm, ip6_input_node.index);
1636
1637   n_left_from = frame->n_vectors;
1638   next_index = node->cached_next_index;
1639   u32 thread_index = vm->thread_index;
1640
1641   while (n_left_from > 0)
1642     {
1643       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1644
1645       while (n_left_from >= 4 && n_left_to_next >= 2)
1646         {
1647           ip_adjacency_t *adj0, *adj1;
1648           vlib_buffer_t *p0, *p1;
1649           ip6_header_t *ip0, *ip1;
1650           u32 pi0, rw_len0, next0, error0, adj_index0;
1651           u32 pi1, rw_len1, next1, error1, adj_index1;
1652           u32 tx_sw_if_index0, tx_sw_if_index1;
1653           bool is_locally_originated0, is_locally_originated1;
1654
1655           /* Prefetch next iteration. */
1656           {
1657             vlib_buffer_t *p2, *p3;
1658
1659             p2 = vlib_get_buffer (vm, from[2]);
1660             p3 = vlib_get_buffer (vm, from[3]);
1661
1662             vlib_prefetch_buffer_header (p2, LOAD);
1663             vlib_prefetch_buffer_header (p3, LOAD);
1664
1665             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1666             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1667
1668             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1669             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1670           }
1671
1672           pi0 = to_next[0] = from[0];
1673           pi1 = to_next[1] = from[1];
1674
1675           from += 2;
1676           n_left_from -= 2;
1677           to_next += 2;
1678           n_left_to_next -= 2;
1679
1680           p0 = vlib_get_buffer (vm, pi0);
1681           p1 = vlib_get_buffer (vm, pi1);
1682
1683           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1684           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1685
1686           ip0 = vlib_buffer_get_current (p0);
1687           ip1 = vlib_buffer_get_current (p1);
1688
1689           error0 = error1 = IP6_ERROR_NONE;
1690           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1691
1692           is_locally_originated0 =
1693             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1694           if (PREDICT_TRUE (!is_locally_originated0))
1695             {
1696               i32 hop_limit0 = ip0->hop_limit;
1697
1698               /* Input node should have reject packets with hop limit 0. */
1699               ASSERT (ip0->hop_limit > 0);
1700
1701               hop_limit0 -= 1;
1702
1703               ip0->hop_limit = hop_limit0;
1704
1705               /*
1706                * If the hop count drops below 1 when forwarding, generate
1707                * an ICMP response.
1708                */
1709               if (PREDICT_FALSE (hop_limit0 <= 0))
1710                 {
1711                   error0 = IP6_ERROR_TIME_EXPIRED;
1712                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1713                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1714                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1715                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1716                                                0);
1717                 }
1718             }
1719           else
1720             {
1721               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1722             }
1723           is_locally_originated1 =
1724             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1725           if (PREDICT_TRUE (!is_locally_originated1))
1726             {
1727               i32 hop_limit1 = ip1->hop_limit;
1728
1729               /* Input node should have reject packets with hop limit 0. */
1730               ASSERT (ip1->hop_limit > 0);
1731
1732               hop_limit1 -= 1;
1733
1734               ip1->hop_limit = hop_limit1;
1735
1736               /*
1737                * If the hop count drops below 1 when forwarding, generate
1738                * an ICMP response.
1739                */
1740               if (PREDICT_FALSE (hop_limit1 <= 0))
1741                 {
1742                   error1 = IP6_ERROR_TIME_EXPIRED;
1743                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1744                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1745                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1746                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1747                                                0);
1748                 }
1749             }
1750           else
1751             {
1752               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1753             }
1754           adj0 = adj_get (adj_index0);
1755           adj1 = adj_get (adj_index1);
1756
1757           rw_len0 = adj0[0].rewrite_header.data_bytes;
1758           rw_len1 = adj1[0].rewrite_header.data_bytes;
1759           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1760           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1761
1762           if (do_counters)
1763             {
1764               vlib_increment_combined_counter
1765                 (&adjacency_counters,
1766                  thread_index, adj_index0, 1,
1767                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1768               vlib_increment_combined_counter
1769                 (&adjacency_counters,
1770                  thread_index, adj_index1, 1,
1771                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1772             }
1773
1774           /* Check MTU of outgoing interface. */
1775           u16 ip0_len =
1776             clib_net_to_host_u16 (ip0->payload_length) +
1777             sizeof (ip6_header_t);
1778           u16 ip1_len =
1779             clib_net_to_host_u16 (ip1->payload_length) +
1780             sizeof (ip6_header_t);
1781           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
1782             ip0_len = gso_mtu_sz (p0);
1783           if (do_gso && (p1->flags & VNET_BUFFER_F_GSO))
1784             ip1_len = gso_mtu_sz (p1);
1785
1786
1787
1788           ip6_mtu_check (p0, ip0_len,
1789                          adj0[0].rewrite_header.max_l3_packet_bytes,
1790                          is_locally_originated0, &next0, &error0);
1791           ip6_mtu_check (p1, ip1_len,
1792                          adj1[0].rewrite_header.max_l3_packet_bytes,
1793                          is_locally_originated1, &next1, &error1);
1794
1795           /* Don't adjust the buffer for hop count issue; icmp-error node
1796            * wants to see the IP headerr */
1797           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1798             {
1799               p0->current_data -= rw_len0;
1800               p0->current_length += rw_len0;
1801
1802               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1803               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1804               next0 = adj0[0].rewrite_header.next_index;
1805
1806               if (PREDICT_FALSE
1807                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1808                 vnet_feature_arc_start (lm->output_feature_arc_index,
1809                                         tx_sw_if_index0, &next0, p0);
1810             }
1811           else
1812             {
1813               p0->error = error_node->errors[error0];
1814             }
1815           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1816             {
1817               p1->current_data -= rw_len1;
1818               p1->current_length += rw_len1;
1819
1820               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1821               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1822               next1 = adj1[0].rewrite_header.next_index;
1823
1824               if (PREDICT_FALSE
1825                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1826                 vnet_feature_arc_start (lm->output_feature_arc_index,
1827                                         tx_sw_if_index1, &next1, p1);
1828             }
1829           else
1830             {
1831               p1->error = error_node->errors[error1];
1832             }
1833
1834           /* Guess we are only writing on simple Ethernet header. */
1835           vnet_rewrite_two_headers (adj0[0], adj1[0],
1836                                     ip0, ip1, sizeof (ethernet_header_t));
1837
1838           if (is_midchain)
1839             {
1840               adj0->sub_type.midchain.fixup_func
1841                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1842               adj1->sub_type.midchain.fixup_func
1843                 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1844             }
1845           if (is_mcast)
1846             {
1847               /*
1848                * copy bytes from the IP address into the MAC rewrite
1849                */
1850               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1851                                           adj0->
1852                                           rewrite_header.dst_mcast_offset,
1853                                           &ip0->dst_address.as_u32[3],
1854                                           (u8 *) ip0);
1855               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1856                                           adj1->
1857                                           rewrite_header.dst_mcast_offset,
1858                                           &ip1->dst_address.as_u32[3],
1859                                           (u8 *) ip1);
1860             }
1861
1862           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1863                                            to_next, n_left_to_next,
1864                                            pi0, pi1, next0, next1);
1865         }
1866
1867       while (n_left_from > 0 && n_left_to_next > 0)
1868         {
1869           ip_adjacency_t *adj0;
1870           vlib_buffer_t *p0;
1871           ip6_header_t *ip0;
1872           u32 pi0, rw_len0;
1873           u32 adj_index0, next0, error0;
1874           u32 tx_sw_if_index0;
1875           bool is_locally_originated0;
1876
1877           pi0 = to_next[0] = from[0];
1878
1879           p0 = vlib_get_buffer (vm, pi0);
1880
1881           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1882
1883           adj0 = adj_get (adj_index0);
1884
1885           ip0 = vlib_buffer_get_current (p0);
1886
1887           error0 = IP6_ERROR_NONE;
1888           next0 = IP6_REWRITE_NEXT_DROP;
1889
1890           /* Check hop limit */
1891           is_locally_originated0 =
1892             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1893           if (PREDICT_TRUE (!is_locally_originated0))
1894             {
1895               i32 hop_limit0 = ip0->hop_limit;
1896
1897               ASSERT (ip0->hop_limit > 0);
1898
1899               hop_limit0 -= 1;
1900
1901               ip0->hop_limit = hop_limit0;
1902
1903               if (PREDICT_FALSE (hop_limit0 <= 0))
1904                 {
1905                   /*
1906                    * If the hop count drops below 1 when forwarding, generate
1907                    * an ICMP response.
1908                    */
1909                   error0 = IP6_ERROR_TIME_EXPIRED;
1910                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1911                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1912                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1913                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1914                                                0);
1915                 }
1916             }
1917           else
1918             {
1919               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1920             }
1921
1922           /* Guess we are only writing on simple Ethernet header. */
1923           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1924
1925           /* Update packet buffer attributes/set output interface. */
1926           rw_len0 = adj0[0].rewrite_header.data_bytes;
1927           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1928
1929           if (do_counters)
1930             {
1931               vlib_increment_combined_counter
1932                 (&adjacency_counters,
1933                  thread_index, adj_index0, 1,
1934                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1935             }
1936
1937           /* Check MTU of outgoing interface. */
1938           u16 ip0_len =
1939             clib_net_to_host_u16 (ip0->payload_length) +
1940             sizeof (ip6_header_t);
1941           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
1942             ip0_len = gso_mtu_sz (p0);
1943
1944           ip6_mtu_check (p0, ip0_len,
1945                          adj0[0].rewrite_header.max_l3_packet_bytes,
1946                          is_locally_originated0, &next0, &error0);
1947
1948           /* Don't adjust the buffer for hop count issue; icmp-error node
1949            * wants to see the IP header */
1950           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1951             {
1952               p0->current_data -= rw_len0;
1953               p0->current_length += rw_len0;
1954
1955               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1956
1957               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1958               next0 = adj0[0].rewrite_header.next_index;
1959
1960               if (PREDICT_FALSE
1961                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1962                 vnet_feature_arc_start (lm->output_feature_arc_index,
1963                                         tx_sw_if_index0, &next0, p0);
1964             }
1965           else
1966             {
1967               p0->error = error_node->errors[error0];
1968             }
1969
1970           if (is_midchain)
1971             {
1972               adj0->sub_type.midchain.fixup_func
1973                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1974             }
1975           if (is_mcast)
1976             {
1977               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1978                                           adj0->
1979                                           rewrite_header.dst_mcast_offset,
1980                                           &ip0->dst_address.as_u32[3],
1981                                           (u8 *) ip0);
1982             }
1983
1984           from += 1;
1985           n_left_from -= 1;
1986           to_next += 1;
1987           n_left_to_next -= 1;
1988
1989           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1990                                            to_next, n_left_to_next,
1991                                            pi0, next0);
1992         }
1993
1994       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1995     }
1996
1997   /* Need to do trace after rewrites to pick up new packet data. */
1998   if (node->flags & VLIB_NODE_FLAG_TRACE)
1999     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2000
2001   return frame->n_vectors;
2002 }
2003
2004 always_inline uword
2005 ip6_rewrite_inline (vlib_main_t * vm,
2006                     vlib_node_runtime_t * node,
2007                     vlib_frame_t * frame,
2008                     int do_counters, int is_midchain, int is_mcast)
2009 {
2010   vnet_main_t *vnm = vnet_get_main ();
2011   if (PREDICT_FALSE (vnm->interface_main.gso_interface_count > 0))
2012     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2013                                         is_midchain, is_mcast,
2014                                         1 /* do_gso */ );
2015   else
2016     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2017                                         is_midchain, is_mcast,
2018                                         0 /* no do_gso */ );
2019 }
2020
2021 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2022                                  vlib_node_runtime_t * node,
2023                                  vlib_frame_t * frame)
2024 {
2025   if (adj_are_counters_enabled ())
2026     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2027   else
2028     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2029 }
2030
2031 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2032                                        vlib_node_runtime_t * node,
2033                                        vlib_frame_t * frame)
2034 {
2035   if (adj_are_counters_enabled ())
2036     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2037   else
2038     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2039 }
2040
2041 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2042                                        vlib_node_runtime_t * node,
2043                                        vlib_frame_t * frame)
2044 {
2045   if (adj_are_counters_enabled ())
2046     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2047   else
2048     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2049 }
2050
2051 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2052                                   vlib_node_runtime_t * node,
2053                                   vlib_frame_t * frame)
2054 {
2055   if (adj_are_counters_enabled ())
2056     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2057   else
2058     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2059 }
2060
2061 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2062                                         vlib_node_runtime_t * node,
2063                                         vlib_frame_t * frame)
2064 {
2065   if (adj_are_counters_enabled ())
2066     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2067   else
2068     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2069 }
2070
2071 /* *INDENT-OFF* */
2072 VLIB_REGISTER_NODE (ip6_midchain_node) =
2073 {
2074   .name = "ip6-midchain",
2075   .vector_size = sizeof (u32),
2076   .format_trace = format_ip6_forward_next_trace,
2077   .sibling_of = "ip6-rewrite",
2078   };
2079
2080 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2081 {
2082   .name = "ip6-rewrite",
2083   .vector_size = sizeof (u32),
2084   .format_trace = format_ip6_rewrite_trace,
2085   .n_next_nodes = IP6_REWRITE_N_NEXT,
2086   .next_nodes =
2087   {
2088     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2089     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2090     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2091   },
2092 };
2093
2094 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2095   .name = "ip6-rewrite-bcast",
2096   .vector_size = sizeof (u32),
2097
2098   .format_trace = format_ip6_rewrite_trace,
2099   .sibling_of = "ip6-rewrite",
2100 };
2101
2102 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2103 {
2104   .name = "ip6-rewrite-mcast",
2105   .vector_size = sizeof (u32),
2106   .format_trace = format_ip6_rewrite_trace,
2107   .sibling_of = "ip6-rewrite",
2108 };
2109
2110
2111 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2112 {
2113   .name = "ip6-mcast-midchain",
2114   .vector_size = sizeof (u32),
2115   .format_trace = format_ip6_rewrite_trace,
2116   .sibling_of = "ip6-rewrite",
2117 };
2118
2119 /* *INDENT-ON* */
2120
2121 /*
2122  * Hop-by-Hop handling
2123  */
2124 #ifndef CLIB_MARCH_VARIANT
2125 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2126 #endif /* CLIB_MARCH_VARIANT */
2127
2128 #define foreach_ip6_hop_by_hop_error \
2129 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2130 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2131 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2132
2133 /* *INDENT-OFF* */
2134 typedef enum
2135 {
2136 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2137   foreach_ip6_hop_by_hop_error
2138 #undef _
2139   IP6_HOP_BY_HOP_N_ERROR,
2140 } ip6_hop_by_hop_error_t;
2141 /* *INDENT-ON* */
2142
2143 /*
2144  * Primary h-b-h handler trace support
2145  * We work pretty hard on the problem for obvious reasons
2146  */
2147 typedef struct
2148 {
2149   u32 next_index;
2150   u32 trace_len;
2151   u8 option_data[256];
2152 } ip6_hop_by_hop_trace_t;
2153
2154 extern vlib_node_registration_t ip6_hop_by_hop_node;
2155
2156 static char *ip6_hop_by_hop_error_strings[] = {
2157 #define _(sym,string) string,
2158   foreach_ip6_hop_by_hop_error
2159 #undef _
2160 };
2161
2162 #ifndef CLIB_MARCH_VARIANT
2163 u8 *
2164 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2165 {
2166   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2167   int total_len = va_arg (*args, int);
2168   ip6_hop_by_hop_option_t *opt0, *limit0;
2169   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2170   u8 type0;
2171
2172   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2173               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2174
2175   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2176   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2177
2178   while (opt0 < limit0)
2179     {
2180       type0 = opt0->type;
2181       switch (type0)
2182         {
2183         case 0:         /* Pad, just stop */
2184           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2185           break;
2186
2187         default:
2188           if (hm->trace[type0])
2189             {
2190               s = (*hm->trace[type0]) (s, opt0);
2191             }
2192           else
2193             {
2194               s =
2195                 format (s, "\n    unrecognized option %d length %d", type0,
2196                         opt0->length);
2197             }
2198           opt0 =
2199             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2200                                          sizeof (ip6_hop_by_hop_option_t));
2201           break;
2202         }
2203     }
2204   return s;
2205 }
2206 #endif
2207
2208 static u8 *
2209 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2210 {
2211   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2212   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2213   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2214   ip6_hop_by_hop_header_t *hbh0;
2215   ip6_hop_by_hop_option_t *opt0, *limit0;
2216   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2217
2218   u8 type0;
2219
2220   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2221
2222   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2223               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2224
2225   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2226   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2227
2228   while (opt0 < limit0)
2229     {
2230       type0 = opt0->type;
2231       switch (type0)
2232         {
2233         case 0:         /* Pad, just stop */
2234           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2235           break;
2236
2237         default:
2238           if (hm->trace[type0])
2239             {
2240               s = (*hm->trace[type0]) (s, opt0);
2241             }
2242           else
2243             {
2244               s =
2245                 format (s, "\n    unrecognized option %d length %d", type0,
2246                         opt0->length);
2247             }
2248           opt0 =
2249             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2250                                          sizeof (ip6_hop_by_hop_option_t));
2251           break;
2252         }
2253     }
2254   return s;
2255 }
2256
2257 always_inline u8
2258 ip6_scan_hbh_options (vlib_buffer_t * b0,
2259                       ip6_header_t * ip0,
2260                       ip6_hop_by_hop_header_t * hbh0,
2261                       ip6_hop_by_hop_option_t * opt0,
2262                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2263 {
2264   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2265   u8 type0;
2266   u8 error0 = 0;
2267
2268   while (opt0 < limit0)
2269     {
2270       type0 = opt0->type;
2271       switch (type0)
2272         {
2273         case 0:         /* Pad1 */
2274           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2275           continue;
2276         case 1:         /* PadN */
2277           break;
2278         default:
2279           if (hm->options[type0])
2280             {
2281               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2282                 {
2283                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2284                   return (error0);
2285                 }
2286             }
2287           else
2288             {
2289               /* Unrecognized mandatory option, check the two high order bits */
2290               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2291                 {
2292                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2293                   break;
2294                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2295                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2296                   *next0 = IP_LOOKUP_NEXT_DROP;
2297                   break;
2298                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2299                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2300                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2301                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2302                                                ICMP6_parameter_problem_unrecognized_option,
2303                                                (u8 *) opt0 - (u8 *) ip0);
2304                   break;
2305                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2306                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2307                   if (!ip6_address_is_multicast (&ip0->dst_address))
2308                     {
2309                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2310                       icmp6_error_set_vnet_buffer (b0,
2311                                                    ICMP6_parameter_problem,
2312                                                    ICMP6_parameter_problem_unrecognized_option,
2313                                                    (u8 *) opt0 - (u8 *) ip0);
2314                     }
2315                   else
2316                     {
2317                       *next0 = IP_LOOKUP_NEXT_DROP;
2318                     }
2319                   break;
2320                 }
2321               return (error0);
2322             }
2323         }
2324       opt0 =
2325         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2326                                      sizeof (ip6_hop_by_hop_option_t));
2327     }
2328   return (error0);
2329 }
2330
2331 /*
2332  * Process the Hop-by-Hop Options header
2333  */
2334 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2335                                     vlib_node_runtime_t * node,
2336                                     vlib_frame_t * frame)
2337 {
2338   vlib_node_runtime_t *error_node =
2339     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2340   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2341   u32 n_left_from, *from, *to_next;
2342   ip_lookup_next_t next_index;
2343
2344   from = vlib_frame_vector_args (frame);
2345   n_left_from = frame->n_vectors;
2346   next_index = node->cached_next_index;
2347
2348   while (n_left_from > 0)
2349     {
2350       u32 n_left_to_next;
2351
2352       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2353
2354       while (n_left_from >= 4 && n_left_to_next >= 2)
2355         {
2356           u32 bi0, bi1;
2357           vlib_buffer_t *b0, *b1;
2358           u32 next0, next1;
2359           ip6_header_t *ip0, *ip1;
2360           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2361           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2362           u8 error0 = 0, error1 = 0;
2363
2364           /* Prefetch next iteration. */
2365           {
2366             vlib_buffer_t *p2, *p3;
2367
2368             p2 = vlib_get_buffer (vm, from[2]);
2369             p3 = vlib_get_buffer (vm, from[3]);
2370
2371             vlib_prefetch_buffer_header (p2, LOAD);
2372             vlib_prefetch_buffer_header (p3, LOAD);
2373
2374             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2375             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2376           }
2377
2378           /* Speculatively enqueue b0, b1 to the current next frame */
2379           to_next[0] = bi0 = from[0];
2380           to_next[1] = bi1 = from[1];
2381           from += 2;
2382           to_next += 2;
2383           n_left_from -= 2;
2384           n_left_to_next -= 2;
2385
2386           b0 = vlib_get_buffer (vm, bi0);
2387           b1 = vlib_get_buffer (vm, bi1);
2388
2389           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2390           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2391           ip_adjacency_t *adj0 = adj_get (adj_index0);
2392           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2393           ip_adjacency_t *adj1 = adj_get (adj_index1);
2394
2395           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2396           next0 = adj0->lookup_next_index;
2397           next1 = adj1->lookup_next_index;
2398
2399           ip0 = vlib_buffer_get_current (b0);
2400           ip1 = vlib_buffer_get_current (b1);
2401           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2402           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2403           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2404           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2405           limit0 =
2406             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2407                                          ((hbh0->length + 1) << 3));
2408           limit1 =
2409             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2410                                          ((hbh1->length + 1) << 3));
2411
2412           /*
2413            * Basic validity checks
2414            */
2415           if ((hbh0->length + 1) << 3 >
2416               clib_net_to_host_u16 (ip0->payload_length))
2417             {
2418               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2419               next0 = IP_LOOKUP_NEXT_DROP;
2420               goto outdual;
2421             }
2422           /* Scan the set of h-b-h options, process ones that we understand */
2423           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2424
2425           if ((hbh1->length + 1) << 3 >
2426               clib_net_to_host_u16 (ip1->payload_length))
2427             {
2428               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2429               next1 = IP_LOOKUP_NEXT_DROP;
2430               goto outdual;
2431             }
2432           /* Scan the set of h-b-h options, process ones that we understand */
2433           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2434
2435         outdual:
2436           /* Has the classifier flagged this buffer for special treatment? */
2437           if (PREDICT_FALSE
2438               ((error0 == 0)
2439                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2440             next0 = hm->next_override;
2441
2442           /* Has the classifier flagged this buffer for special treatment? */
2443           if (PREDICT_FALSE
2444               ((error1 == 0)
2445                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2446             next1 = hm->next_override;
2447
2448           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2449             {
2450               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2451                 {
2452                   ip6_hop_by_hop_trace_t *t =
2453                     vlib_add_trace (vm, node, b0, sizeof (*t));
2454                   u32 trace_len = (hbh0->length + 1) << 3;
2455                   t->next_index = next0;
2456                   /* Capture the h-b-h option verbatim */
2457                   trace_len =
2458                     trace_len <
2459                     ARRAY_LEN (t->option_data) ? trace_len :
2460                     ARRAY_LEN (t->option_data);
2461                   t->trace_len = trace_len;
2462                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2463                 }
2464               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2465                 {
2466                   ip6_hop_by_hop_trace_t *t =
2467                     vlib_add_trace (vm, node, b1, sizeof (*t));
2468                   u32 trace_len = (hbh1->length + 1) << 3;
2469                   t->next_index = next1;
2470                   /* Capture the h-b-h option verbatim */
2471                   trace_len =
2472                     trace_len <
2473                     ARRAY_LEN (t->option_data) ? trace_len :
2474                     ARRAY_LEN (t->option_data);
2475                   t->trace_len = trace_len;
2476                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2477                 }
2478
2479             }
2480
2481           b0->error = error_node->errors[error0];
2482           b1->error = error_node->errors[error1];
2483
2484           /* verify speculative enqueue, maybe switch current next frame */
2485           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2486                                            n_left_to_next, bi0, bi1, next0,
2487                                            next1);
2488         }
2489
2490       while (n_left_from > 0 && n_left_to_next > 0)
2491         {
2492           u32 bi0;
2493           vlib_buffer_t *b0;
2494           u32 next0;
2495           ip6_header_t *ip0;
2496           ip6_hop_by_hop_header_t *hbh0;
2497           ip6_hop_by_hop_option_t *opt0, *limit0;
2498           u8 error0 = 0;
2499
2500           /* Speculatively enqueue b0 to the current next frame */
2501           bi0 = from[0];
2502           to_next[0] = bi0;
2503           from += 1;
2504           to_next += 1;
2505           n_left_from -= 1;
2506           n_left_to_next -= 1;
2507
2508           b0 = vlib_get_buffer (vm, bi0);
2509           /*
2510            * Default use the next_index from the adjacency.
2511            * A HBH option rarely redirects to a different node
2512            */
2513           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2514           ip_adjacency_t *adj0 = adj_get (adj_index0);
2515           next0 = adj0->lookup_next_index;
2516
2517           ip0 = vlib_buffer_get_current (b0);
2518           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2519           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2520           limit0 =
2521             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2522                                          ((hbh0->length + 1) << 3));
2523
2524           /*
2525            * Basic validity checks
2526            */
2527           if ((hbh0->length + 1) << 3 >
2528               clib_net_to_host_u16 (ip0->payload_length))
2529             {
2530               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2531               next0 = IP_LOOKUP_NEXT_DROP;
2532               goto out0;
2533             }
2534
2535           /* Scan the set of h-b-h options, process ones that we understand */
2536           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2537
2538         out0:
2539           /* Has the classifier flagged this buffer for special treatment? */
2540           if (PREDICT_FALSE
2541               ((error0 == 0)
2542                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2543             next0 = hm->next_override;
2544
2545           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2546             {
2547               ip6_hop_by_hop_trace_t *t =
2548                 vlib_add_trace (vm, node, b0, sizeof (*t));
2549               u32 trace_len = (hbh0->length + 1) << 3;
2550               t->next_index = next0;
2551               /* Capture the h-b-h option verbatim */
2552               trace_len =
2553                 trace_len <
2554                 ARRAY_LEN (t->option_data) ? trace_len :
2555                 ARRAY_LEN (t->option_data);
2556               t->trace_len = trace_len;
2557               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2558             }
2559
2560           b0->error = error_node->errors[error0];
2561
2562           /* verify speculative enqueue, maybe switch current next frame */
2563           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2564                                            n_left_to_next, bi0, next0);
2565         }
2566       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2567     }
2568   return frame->n_vectors;
2569 }
2570
2571 /* *INDENT-OFF* */
2572 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2573 {
2574   .name = "ip6-hop-by-hop",
2575   .sibling_of = "ip6-lookup",
2576   .vector_size = sizeof (u32),
2577   .format_trace = format_ip6_hop_by_hop_trace,
2578   .type = VLIB_NODE_TYPE_INTERNAL,
2579   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2580   .error_strings = ip6_hop_by_hop_error_strings,
2581   .n_next_nodes = 0,
2582 };
2583 /* *INDENT-ON* */
2584
2585 static clib_error_t *
2586 ip6_hop_by_hop_init (vlib_main_t * vm)
2587 {
2588   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2589   clib_memset (hm->options, 0, sizeof (hm->options));
2590   clib_memset (hm->trace, 0, sizeof (hm->trace));
2591   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2592   return (0);
2593 }
2594
2595 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2596
2597 #ifndef CLIB_MARCH_VARIANT
2598 void
2599 ip6_hbh_set_next_override (uword next)
2600 {
2601   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2602
2603   hm->next_override = next;
2604 }
2605
2606 int
2607 ip6_hbh_register_option (u8 option,
2608                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2609                                       ip6_hop_by_hop_option_t * opt),
2610                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2611 {
2612   ip6_main_t *im = &ip6_main;
2613   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2614
2615   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2616
2617   /* Already registered */
2618   if (hm->options[option])
2619     return (-1);
2620
2621   hm->options[option] = options;
2622   hm->trace[option] = trace;
2623
2624   /* Set global variable */
2625   im->hbh_enabled = 1;
2626
2627   return (0);
2628 }
2629
2630 int
2631 ip6_hbh_unregister_option (u8 option)
2632 {
2633   ip6_main_t *im = &ip6_main;
2634   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2635
2636   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2637
2638   /* Not registered */
2639   if (!hm->options[option])
2640     return (-1);
2641
2642   hm->options[option] = NULL;
2643   hm->trace[option] = NULL;
2644
2645   /* Disable global knob if this was the last option configured */
2646   int i;
2647   bool found = false;
2648   for (i = 0; i < 256; i++)
2649     {
2650       if (hm->options[option])
2651         {
2652           found = true;
2653           break;
2654         }
2655     }
2656   if (!found)
2657     im->hbh_enabled = 0;
2658
2659   return (0);
2660 }
2661
2662 /* Global IP6 main. */
2663 ip6_main_t ip6_main;
2664 #endif
2665
2666 static clib_error_t *
2667 ip6_lookup_init (vlib_main_t * vm)
2668 {
2669   ip6_main_t *im = &ip6_main;
2670   clib_error_t *error;
2671   uword i;
2672
2673   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2674     return error;
2675
2676   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2677     {
2678       u32 j, i0, i1;
2679
2680       i0 = i / 32;
2681       i1 = i % 32;
2682
2683       for (j = 0; j < i0; j++)
2684         im->fib_masks[i].as_u32[j] = ~0;
2685
2686       if (i1)
2687         im->fib_masks[i].as_u32[i0] =
2688           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2689     }
2690
2691   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2692
2693   if (im->lookup_table_nbuckets == 0)
2694     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2695
2696   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2697
2698   if (im->lookup_table_size == 0)
2699     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2700
2701   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2702                          "ip6 FIB fwding table",
2703                          im->lookup_table_nbuckets, im->lookup_table_size);
2704   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2705                          "ip6 FIB non-fwding table",
2706                          im->lookup_table_nbuckets, im->lookup_table_size);
2707   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2708                          "ip6 mFIB table",
2709                          im->lookup_table_nbuckets, im->lookup_table_size);
2710
2711   /* Create FIB with index 0 and table id of 0. */
2712   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2713                                      FIB_SOURCE_DEFAULT_ROUTE);
2714   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2715                                       MFIB_SOURCE_DEFAULT_ROUTE);
2716
2717   {
2718     pg_node_t *pn;
2719     pn = pg_get_node (ip6_lookup_node.index);
2720     pn->unformat_edit = unformat_pg_ip6_header;
2721   }
2722
2723   /* Unless explicitly configured, don't process HBH options */
2724   im->hbh_enabled = 0;
2725
2726   {
2727     icmp6_neighbor_solicitation_header_t p;
2728
2729     clib_memset (&p, 0, sizeof (p));
2730
2731     p.ip.ip_version_traffic_class_and_flow_label =
2732       clib_host_to_net_u32 (0x6 << 28);
2733     p.ip.payload_length =
2734       clib_host_to_net_u16 (sizeof (p) -
2735                             STRUCT_OFFSET_OF
2736                             (icmp6_neighbor_solicitation_header_t, neighbor));
2737     p.ip.protocol = IP_PROTOCOL_ICMP6;
2738     p.ip.hop_limit = 255;
2739     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2740
2741     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2742
2743     p.link_layer_option.header.type =
2744       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2745     p.link_layer_option.header.n_data_u64s =
2746       sizeof (p.link_layer_option) / sizeof (u64);
2747
2748     vlib_packet_template_init (vm,
2749                                &im->discover_neighbor_packet_template,
2750                                &p, sizeof (p),
2751                                /* alloc chunk size */ 8,
2752                                "ip6 neighbor discovery");
2753   }
2754
2755   return error;
2756 }
2757
2758 VLIB_INIT_FUNCTION (ip6_lookup_init);
2759
2760 static clib_error_t *
2761 test_ip6_link_command_fn (vlib_main_t * vm,
2762                           unformat_input_t * input, vlib_cli_command_t * cmd)
2763 {
2764   u8 mac[6];
2765   ip6_address_t _a, *a = &_a;
2766
2767   if (unformat (input, "%U", unformat_ethernet_address, mac))
2768     {
2769       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2770       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2771       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2772       vlib_cli_output (vm, "Original MAC address: %U",
2773                        format_ethernet_address, mac);
2774     }
2775
2776   return 0;
2777 }
2778
2779 /*?
2780  * This command converts the given MAC Address into an IPv6 link-local
2781  * address.
2782  *
2783  * @cliexpar
2784  * Example of how to create an IPv6 link-local address:
2785  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2786  * Link local address: fe80::14d9:e0ff:fe91:7986
2787  * Original MAC address: 16:d9:e0:91:79:86
2788  * @cliexend
2789 ?*/
2790 /* *INDENT-OFF* */
2791 VLIB_CLI_COMMAND (test_link_command, static) =
2792 {
2793   .path = "test ip6 link",
2794   .function = test_ip6_link_command_fn,
2795   .short_help = "test ip6 link <mac-address>",
2796 };
2797 /* *INDENT-ON* */
2798
2799 #ifndef CLIB_MARCH_VARIANT
2800 int
2801 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2802 {
2803   u32 fib_index;
2804
2805   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2806
2807   if (~0 == fib_index)
2808     return VNET_API_ERROR_NO_SUCH_FIB;
2809
2810   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2811                                   flow_hash_config);
2812
2813   return 0;
2814 }
2815 #endif
2816
2817 static clib_error_t *
2818 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2819                               unformat_input_t * input,
2820                               vlib_cli_command_t * cmd)
2821 {
2822   int matched = 0;
2823   u32 table_id = 0;
2824   u32 flow_hash_config = 0;
2825   int rv;
2826
2827   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2828     {
2829       if (unformat (input, "table %d", &table_id))
2830         matched = 1;
2831 #define _(a,v) \
2832     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2833       foreach_flow_hash_bit
2834 #undef _
2835         else
2836         break;
2837     }
2838
2839   if (matched == 0)
2840     return clib_error_return (0, "unknown input `%U'",
2841                               format_unformat_error, input);
2842
2843   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2844   switch (rv)
2845     {
2846     case 0:
2847       break;
2848
2849     case -1:
2850       return clib_error_return (0, "no such FIB table %d", table_id);
2851
2852     default:
2853       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2854       break;
2855     }
2856
2857   return 0;
2858 }
2859
2860 /*?
2861  * Configure the set of IPv6 fields used by the flow hash.
2862  *
2863  * @cliexpar
2864  * @parblock
2865  * Example of how to set the flow hash on a given table:
2866  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2867  *
2868  * Example of display the configured flow hash:
2869  * @cliexstart{show ip6 fib}
2870  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2871  * @::/0
2872  *   unicast-ip6-chain
2873  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2874  *     [0] [@0]: dpo-drop ip6
2875  * fe80::/10
2876  *   unicast-ip6-chain
2877  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2878  *     [0] [@2]: dpo-receive
2879  * ff02::1/128
2880  *   unicast-ip6-chain
2881  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2882  *     [0] [@2]: dpo-receive
2883  * ff02::2/128
2884  *   unicast-ip6-chain
2885  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2886  *     [0] [@2]: dpo-receive
2887  * ff02::16/128
2888  *   unicast-ip6-chain
2889  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2890  *     [0] [@2]: dpo-receive
2891  * ff02::1:ff00:0/104
2892  *   unicast-ip6-chain
2893  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2894  *     [0] [@2]: dpo-receive
2895  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2896  * @::/0
2897  *   unicast-ip6-chain
2898  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2899  *     [0] [@0]: dpo-drop ip6
2900  * @::a:1:1:0:4/126
2901  *   unicast-ip6-chain
2902  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2903  *     [0] [@4]: ipv6-glean: af_packet0
2904  * @::a:1:1:0:7/128
2905  *   unicast-ip6-chain
2906  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2907  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2908  * fe80::/10
2909  *   unicast-ip6-chain
2910  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2911  *     [0] [@2]: dpo-receive
2912  * fe80::fe:3eff:fe3e:9222/128
2913  *   unicast-ip6-chain
2914  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2915  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2916  * ff02::1/128
2917  *   unicast-ip6-chain
2918  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2919  *     [0] [@2]: dpo-receive
2920  * ff02::2/128
2921  *   unicast-ip6-chain
2922  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2923  *     [0] [@2]: dpo-receive
2924  * ff02::16/128
2925  *   unicast-ip6-chain
2926  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2927  *     [0] [@2]: dpo-receive
2928  * ff02::1:ff00:0/104
2929  *   unicast-ip6-chain
2930  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2931  *     [0] [@2]: dpo-receive
2932  * @cliexend
2933  * @endparblock
2934 ?*/
2935 /* *INDENT-OFF* */
2936 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2937 {
2938   .path = "set ip6 flow-hash",
2939   .short_help =
2940   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2941   .function = set_ip6_flow_hash_command_fn,
2942 };
2943 /* *INDENT-ON* */
2944
2945 static clib_error_t *
2946 show_ip6_local_command_fn (vlib_main_t * vm,
2947                            unformat_input_t * input, vlib_cli_command_t * cmd)
2948 {
2949   ip6_main_t *im = &ip6_main;
2950   ip_lookup_main_t *lm = &im->lookup_main;
2951   int i;
2952
2953   vlib_cli_output (vm, "Protocols handled by ip6_local");
2954   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2955     {
2956       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2957         {
2958
2959           u32 node_index = vlib_get_node (vm,
2960                                           ip6_local_node.index)->
2961             next_nodes[lm->local_next_by_ip_protocol[i]];
2962           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2963                            node_index);
2964         }
2965     }
2966   return 0;
2967 }
2968
2969
2970
2971 /*?
2972  * Display the set of protocols handled by the local IPv6 stack.
2973  *
2974  * @cliexpar
2975  * Example of how to display local protocol table:
2976  * @cliexstart{show ip6 local}
2977  * Protocols handled by ip6_local
2978  * 17
2979  * 43
2980  * 58
2981  * 115
2982  * @cliexend
2983 ?*/
2984 /* *INDENT-OFF* */
2985 VLIB_CLI_COMMAND (show_ip6_local, static) =
2986 {
2987   .path = "show ip6 local",
2988   .function = show_ip6_local_command_fn,
2989   .short_help = "show ip6 local",
2990 };
2991 /* *INDENT-ON* */
2992
2993 #ifndef CLIB_MARCH_VARIANT
2994 int
2995 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2996                              u32 table_index)
2997 {
2998   vnet_main_t *vnm = vnet_get_main ();
2999   vnet_interface_main_t *im = &vnm->interface_main;
3000   ip6_main_t *ipm = &ip6_main;
3001   ip_lookup_main_t *lm = &ipm->lookup_main;
3002   vnet_classify_main_t *cm = &vnet_classify_main;
3003   ip6_address_t *if_addr;
3004
3005   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3006     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3007
3008   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3009     return VNET_API_ERROR_NO_SUCH_ENTRY;
3010
3011   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3012   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3013
3014   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3015
3016   if (NULL != if_addr)
3017     {
3018       fib_prefix_t pfx = {
3019         .fp_len = 128,
3020         .fp_proto = FIB_PROTOCOL_IP6,
3021         .fp_addr.ip6 = *if_addr,
3022       };
3023       u32 fib_index;
3024
3025       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3026                                                        sw_if_index);
3027
3028
3029       if (table_index != (u32) ~ 0)
3030         {
3031           dpo_id_t dpo = DPO_INVALID;
3032
3033           dpo_set (&dpo,
3034                    DPO_CLASSIFY,
3035                    DPO_PROTO_IP6,
3036                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3037
3038           fib_table_entry_special_dpo_add (fib_index,
3039                                            &pfx,
3040                                            FIB_SOURCE_CLASSIFY,
3041                                            FIB_ENTRY_FLAG_NONE, &dpo);
3042           dpo_reset (&dpo);
3043         }
3044       else
3045         {
3046           fib_table_entry_special_remove (fib_index,
3047                                           &pfx, FIB_SOURCE_CLASSIFY);
3048         }
3049     }
3050
3051   return 0;
3052 }
3053 #endif
3054
3055 static clib_error_t *
3056 set_ip6_classify_command_fn (vlib_main_t * vm,
3057                              unformat_input_t * input,
3058                              vlib_cli_command_t * cmd)
3059 {
3060   u32 table_index = ~0;
3061   int table_index_set = 0;
3062   u32 sw_if_index = ~0;
3063   int rv;
3064
3065   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3066     {
3067       if (unformat (input, "table-index %d", &table_index))
3068         table_index_set = 1;
3069       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3070                          vnet_get_main (), &sw_if_index))
3071         ;
3072       else
3073         break;
3074     }
3075
3076   if (table_index_set == 0)
3077     return clib_error_return (0, "classify table-index must be specified");
3078
3079   if (sw_if_index == ~0)
3080     return clib_error_return (0, "interface / subif must be specified");
3081
3082   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3083
3084   switch (rv)
3085     {
3086     case 0:
3087       break;
3088
3089     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3090       return clib_error_return (0, "No such interface");
3091
3092     case VNET_API_ERROR_NO_SUCH_ENTRY:
3093       return clib_error_return (0, "No such classifier table");
3094     }
3095   return 0;
3096 }
3097
3098 /*?
3099  * Assign a classification table to an interface. The classification
3100  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3101  * commands. Once the table is create, use this command to filter packets
3102  * on an interface.
3103  *
3104  * @cliexpar
3105  * Example of how to assign a classification table to an interface:
3106  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3107 ?*/
3108 /* *INDENT-OFF* */
3109 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3110 {
3111   .path = "set ip6 classify",
3112   .short_help =
3113   "set ip6 classify intfc <interface> table-index <classify-idx>",
3114   .function = set_ip6_classify_command_fn,
3115 };
3116 /* *INDENT-ON* */
3117
3118 static clib_error_t *
3119 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3120 {
3121   ip6_main_t *im = &ip6_main;
3122   uword heapsize = 0;
3123   u32 tmp;
3124   u32 nbuckets = 0;
3125
3126   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3127     {
3128       if (unformat (input, "hash-buckets %d", &tmp))
3129         nbuckets = tmp;
3130       else if (unformat (input, "heap-size %U",
3131                          unformat_memory_size, &heapsize))
3132         ;
3133       else
3134         return clib_error_return (0, "unknown input '%U'",
3135                                   format_unformat_error, input);
3136     }
3137
3138   im->lookup_table_nbuckets = nbuckets;
3139   im->lookup_table_size = heapsize;
3140
3141   return 0;
3142 }
3143
3144 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3145
3146 /*
3147  * fd.io coding-style-patch-verification: ON
3148  *
3149  * Local Variables:
3150  * eval: (c-set-style "gnu")
3151  * End:
3152  */