src/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ip/ip_frag.h>
  43 #include <vnet/ip/ip6_neighbor.h>
  44 #include <vnet/ethernet/ethernet.h>     /* for ethernet_header_t */
  45 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  46 #include <vppinfra/cache.h>
  47 #include <vnet/fib/fib_urpf_list.h>     /* for FIB uRPF check */
  48 #include <vnet/fib/ip6_fib.h>
  49 #include <vnet/mfib/ip6_mfib.h>
  50 #include <vnet/dpo/load_balance_map.h>
  51 #include <vnet/dpo/classify_dpo.h>
  52
  53 #include <vppinfra/bihash_template.c>
  54 #include <vnet/ip/ip6_forward.h>
  55
  56 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  57 #define OI_DECAP   0x80000000
  58
  59 static void
  60 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
  61                           ip6_main_t * im, u32 fib_index,
  62                           ip_interface_address_t * a)
  63 {
  64   ip_lookup_main_t *lm = &im->lookup_main;
  65   ip6_address_t *address = ip_interface_address_get_address (lm, a);
  66   fib_prefix_t pfx = {
  67     .fp_len = a->address_length,
  68     .fp_proto = FIB_PROTOCOL_IP6,
  69     .fp_addr.ip6 = *address,
  70   };
  71
  72   if (a->address_length < 128)
  73     {
  74       fib_table_entry_update_one_path (fib_index,
  75                                        &pfx,
  76                                        FIB_SOURCE_INTERFACE,
  77                                        (FIB_ENTRY_FLAG_CONNECTED |
  78                                         FIB_ENTRY_FLAG_ATTACHED),
  79                                        DPO_PROTO_IP6,
  80                                        /* No next-hop address */
  81                                        NULL, sw_if_index,
  82                                        /* invalid FIB index */
  83                                        ~0, 1,
  84                                        /* no label stack */
  85                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
  86     }
  87
  88   pfx.fp_len = 128;
  89   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
  90     {
  91       u32 classify_table_index =
  92         lm->classify_table_index_by_sw_if_index[sw_if_index];
  93       if (classify_table_index != (u32) ~ 0)
  94         {
  95           dpo_id_t dpo = DPO_INVALID;
  96
  97           dpo_set (&dpo,
  98                    DPO_CLASSIFY,
  99                    DPO_PROTO_IP6,
 100                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 101
 102           fib_table_entry_special_dpo_add (fib_index,
 103                                            &pfx,
 104                                            FIB_SOURCE_CLASSIFY,
 105                                            FIB_ENTRY_FLAG_NONE, &dpo);
 106           dpo_reset (&dpo);
 107         }
 108     }
 109
 110   fib_table_entry_update_one_path (fib_index, &pfx,
 111                                    FIB_SOURCE_INTERFACE,
 112                                    (FIB_ENTRY_FLAG_CONNECTED |
 113                                     FIB_ENTRY_FLAG_LOCAL),
 114                                    DPO_PROTO_IP6,
 115                                    &pfx.fp_addr,
 116                                    sw_if_index, ~0,
 117                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 118 }
 119
 120 static void
 121 ip6_del_interface_routes (ip6_main_t * im,
 122                           u32 fib_index,
 123                           ip6_address_t * address, u32 address_length)
 124 {
 125   fib_prefix_t pfx = {
 126     .fp_len = address_length,
 127     .fp_proto = FIB_PROTOCOL_IP6,
 128     .fp_addr.ip6 = *address,
 129   };
 130
 131   if (pfx.fp_len < 128)
 132     {
 133       fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 134
 135     }
 136
 137   pfx.fp_len = 128;
 138   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 139 }
 140
 141 void
 142 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 143 {
 144   ip6_main_t *im = &ip6_main;
 145
 146   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 147
 148   /*
 149    * enable/disable only on the 1<->0 transition
 150    */
 151   if (is_enable)
 152     {
 153       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 154         return;
 155     }
 156   else
 157     {
 158       /* The ref count is 0 when an address is removed from an interface that has
 159        * no address - this is not a ciritical error */
 160       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 161           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 162         return;
 163     }
 164
 165   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 166                                !is_enable, 0, 0);
 167
 168   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 169                                sw_if_index, !is_enable, 0, 0);
 170 }
 171
 172 /* get first interface address */
 173 ip6_address_t *
 174 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 175 {
 176   ip_lookup_main_t *lm = &im->lookup_main;
 177   ip_interface_address_t *ia = 0;
 178   ip6_address_t *result = 0;
 179
 180   /* *INDENT-OFF* */
 181   foreach_ip_interface_address (lm, ia, sw_if_index,
 182                                 1 /* honor unnumbered */,
 183   ({
 184     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 185     result = a;
 186     break;
 187   }));
 188   /* *INDENT-ON* */
 189   return result;
 190 }
 191
 192 clib_error_t *
 193 ip6_add_del_interface_address (vlib_main_t * vm,
 194                                u32 sw_if_index,
 195                                ip6_address_t * address,
 196                                u32 address_length, u32 is_del)
 197 {
 198   vnet_main_t *vnm = vnet_get_main ();
 199   ip6_main_t *im = &ip6_main;
 200   ip_lookup_main_t *lm = &im->lookup_main;
 201   clib_error_t *error;
 202   u32 if_address_index;
 203   ip6_address_fib_t ip6_af, *addr_fib = 0;
 204
 205   /* local0 interface doesn't support IP addressing */
 206   if (sw_if_index == 0)
 207     {
 208       return
 209         clib_error_create ("local0 interface doesn't support IP addressing");
 210     }
 211
 212   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 213   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 214
 215   ip6_addr_fib_init (&ip6_af, address,
 216                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 217   vec_add1 (addr_fib, ip6_af);
 218
 219   /* *INDENT-OFF* */
 220   if (!is_del)
 221     {
 222       /* When adding an address check that it does not conflict
 223          with an existing address on any interface in this table. */
 224       ip_interface_address_t *ia;
 225       vnet_sw_interface_t *sif;
 226
 227       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 228       ({
 229           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 230               im->fib_index_by_sw_if_index[sif->sw_if_index])
 231             {
 232               foreach_ip_interface_address
 233                 (&im->lookup_main, ia, sif->sw_if_index,
 234                  0 /* honor unnumbered */ ,
 235                  ({
 236                    ip6_address_t * x =
 237                      ip_interface_address_get_address
 238                      (&im->lookup_main, ia);
 239                    if (ip6_destination_matches_route
 240                        (im, address, x, ia->address_length) ||
 241                        ip6_destination_matches_route (im,
 242                                                       x,
 243                                                       address,
 244                                                       address_length))
 245                      {
 246                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 247                        return
 248                          clib_error_create
 249                          ("failed to add %U which conflicts with %U for interface %U",
 250                           format_ip6_address_and_length, address,
 251                           address_length,
 252                           format_ip6_address_and_length, x,
 253                           ia->address_length,
 254                           format_vnet_sw_if_index_name, vnm,
 255                           sif->sw_if_index);
 256                      }
 257                  }));
 258             }
 259       }));
 260     }
 261   /* *INDENT-ON* */
 262
 263   {
 264     uword elts_before = pool_elts (lm->if_address_pool);
 265
 266     error = ip_interface_address_add_del
 267       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 268     if (error)
 269       goto done;
 270
 271     /* Pool did not grow: add duplicate address. */
 272     if (elts_before == pool_elts (lm->if_address_pool))
 273       goto done;
 274   }
 275
 276   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 277
 278   if (is_del)
 279     ip6_del_interface_routes (im, ip6_af.fib_index, address, address_length);
 280   else
 281     ip6_add_interface_routes (vnm, sw_if_index,
 282                               im, ip6_af.fib_index,
 283                               pool_elt_at_index (lm->if_address_pool,
 284                                                  if_address_index));
 285
 286   {
 287     ip6_add_del_interface_address_callback_t *cb;
 288     vec_foreach (cb, im->add_del_interface_address_callbacks)
 289       cb->function (im, cb->function_opaque, sw_if_index,
 290                     address, address_length, if_address_index, is_del);
 291   }
 292
 293 done:
 294   vec_free (addr_fib);
 295   return error;
 296 }
 297
 298 clib_error_t *
 299 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 300 {
 301   ip6_main_t *im = &ip6_main;
 302   ip_interface_address_t *ia;
 303   ip6_address_t *a;
 304   u32 is_admin_up, fib_index;
 305
 306   /* Fill in lookup tables with default table (0). */
 307   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 308
 309   vec_validate_init_empty (im->
 310                            lookup_main.if_address_pool_index_by_sw_if_index,
 311                            sw_if_index, ~0);
 312
 313   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 314
 315   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 316
 317   /* *INDENT-OFF* */
 318   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 319                                 0 /* honor unnumbered */,
 320   ({
 321     a = ip_interface_address_get_address (&im->lookup_main, ia);
 322     if (is_admin_up)
 323       ip6_add_interface_routes (vnm, sw_if_index,
 324                                 im, fib_index,
 325                                 ia);
 326     else
 327       ip6_del_interface_routes (im, fib_index,
 328                                 a, ia->address_length);
 329   }));
 330   /* *INDENT-ON* */
 331
 332   return 0;
 333 }
 334
 335 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 336
 337 /* Built-in ip6 unicast rx feature path definition */
 338 /* *INDENT-OFF* */
 339 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 340 {
 341   .arc_name  = "ip6-unicast",
 342   .start_nodes = VNET_FEATURES ("ip6-input"),
 343   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 344 };
 345
 346 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 347 {
 348   .arc_name = "ip6-unicast",
 349   .node_name = "ip6-flow-classify",
 350   .runs_before = VNET_FEATURES ("ip6-inacl"),
 351 };
 352
 353 VNET_FEATURE_INIT (ip6_inacl, static) =
 354 {
 355   .arc_name = "ip6-unicast",
 356   .node_name = "ip6-inacl",
 357   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 358 };
 359
 360 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 361 {
 362   .arc_name = "ip6-unicast",
 363   .node_name = "ip6-policer-classify",
 364   .runs_before = VNET_FEATURES ("ipsec-input-ip6"),
 365 };
 366
 367 VNET_FEATURE_INIT (ip6_ipsec, static) =
 368 {
 369   .arc_name = "ip6-unicast",
 370   .node_name = "ipsec-input-ip6",
 371   .runs_before = VNET_FEATURES ("l2tp-decap"),
 372 };
 373
 374 VNET_FEATURE_INIT (ip6_l2tp, static) =
 375 {
 376   .arc_name = "ip6-unicast",
 377   .node_name = "l2tp-decap",
 378   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 379 };
 380
 381 VNET_FEATURE_INIT (ip6_vpath, static) =
 382 {
 383   .arc_name = "ip6-unicast",
 384   .node_name = "vpath-input-ip6",
 385   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 386 };
 387
 388 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 389 {
 390   .arc_name = "ip6-unicast",
 391   .node_name = "ip6-vxlan-bypass",
 392   .runs_before = VNET_FEATURES ("ip6-lookup"),
 393 };
 394
 395 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 396 {
 397   .arc_name = "ip6-unicast",
 398   .node_name = "ip6-not-enabled",
 399   .runs_before = VNET_FEATURES ("ip6-lookup"),
 400 };
 401
 402 VNET_FEATURE_INIT (ip6_lookup, static) =
 403 {
 404   .arc_name = "ip6-unicast",
 405   .node_name = "ip6-lookup",
 406   .runs_before = 0,  /*last feature*/
 407 };
 408
 409 /* Built-in ip6 multicast rx feature path definition (none now) */
 410 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 411 {
 412   .arc_name  = "ip6-multicast",
 413   .start_nodes = VNET_FEATURES ("ip6-input"),
 414   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 415 };
 416
 417 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 418   .arc_name = "ip6-multicast",
 419   .node_name = "vpath-input-ip6",
 420   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 421 };
 422
 423 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 424   .arc_name = "ip6-multicast",
 425   .node_name = "ip6-not-enabled",
 426   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 427 };
 428
 429 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 430   .arc_name = "ip6-multicast",
 431   .node_name = "ip6-mfib-forward-lookup",
 432   .runs_before = 0, /* last feature */
 433 };
 434
 435 /* Built-in ip4 tx feature path definition */
 436 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 437 {
 438   .arc_name  = "ip6-output",
 439   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 440   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 441 };
 442
 443 VNET_FEATURE_INIT (ip6_outacl, static) = {
 444   .arc_name = "ip6-output",
 445   .node_name = "ip6-outacl",
 446   .runs_before = VNET_FEATURES ("ipsec-output-ip6"),
 447 };
 448
 449 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 450   .arc_name = "ip6-output",
 451   .node_name = "ipsec-output-ip6",
 452   .runs_before = VNET_FEATURES ("interface-output"),
 453 };
 454
 455 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 456   .arc_name = "ip6-output",
 457   .node_name = "interface-output",
 458   .runs_before = 0, /* not before any other features */
 459 };
 460 /* *INDENT-ON* */
 461
 462 clib_error_t *
 463 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 464 {
 465   ip6_main_t *im = &ip6_main;
 466
 467   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 468   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 469
 470   if (!is_add)
 471     {
 472       /* Ensure that IPv6 is disabled */
 473       ip6_main_t *im6 = &ip6_main;
 474       ip_lookup_main_t *lm6 = &im6->lookup_main;
 475       ip_interface_address_t *ia = 0;
 476       ip6_address_t *address;
 477       vlib_main_t *vm = vlib_get_main ();
 478
 479       ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ );
 480       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 481       /* *INDENT-OFF* */
 482       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 483       ({
 484         address = ip_interface_address_get_address (lm6, ia);
 485         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 486       }));
 487       /* *INDENT-ON* */
 488       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 489     }
 490
 491   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 492                                is_add, 0, 0);
 493
 494   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 495                                sw_if_index, is_add, 0, 0);
 496
 497   return /* no error */ 0;
 498 }
 499
 500 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 501
 502 static uword
 503 ip6_lookup (vlib_main_t * vm,
 504             vlib_node_runtime_t * node, vlib_frame_t * frame)
 505 {
 506   return ip6_lookup_inline (vm, node, frame);
 507 }
 508
 509 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 510
 511 /* *INDENT-OFF* */
 512 VLIB_REGISTER_NODE (ip6_lookup_node) =
 513 {
 514   .function = ip6_lookup,
 515   .name = "ip6-lookup",
 516   .vector_size = sizeof (u32),
 517   .format_trace = format_ip6_lookup_trace,
 518   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 519   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 520 };
 521 /* *INDENT-ON* */
 522
 523 VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup);
 524
 525 always_inline uword
 526 ip6_load_balance (vlib_main_t * vm,
 527                   vlib_node_runtime_t * node, vlib_frame_t * frame)
 528 {
 529   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 530   u32 n_left_from, n_left_to_next, *from, *to_next;
 531   ip_lookup_next_t next;
 532   u32 thread_index = vlib_get_thread_index ();
 533   ip6_main_t *im = &ip6_main;
 534
 535   from = vlib_frame_vector_args (frame);
 536   n_left_from = frame->n_vectors;
 537   next = node->cached_next_index;
 538
 539   if (node->flags & VLIB_NODE_FLAG_TRACE)
 540     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 541
 542   while (n_left_from > 0)
 543     {
 544       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 545
 546
 547       while (n_left_from >= 4 && n_left_to_next >= 2)
 548         {
 549           ip_lookup_next_t next0, next1;
 550           const load_balance_t *lb0, *lb1;
 551           vlib_buffer_t *p0, *p1;
 552           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 553           const ip6_header_t *ip0, *ip1;
 554           const dpo_id_t *dpo0, *dpo1;
 555
 556           /* Prefetch next iteration. */
 557           {
 558             vlib_buffer_t *p2, *p3;
 559
 560             p2 = vlib_get_buffer (vm, from[2]);
 561             p3 = vlib_get_buffer (vm, from[3]);
 562
 563             vlib_prefetch_buffer_header (p2, STORE);
 564             vlib_prefetch_buffer_header (p3, STORE);
 565
 566             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 567             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 568           }
 569
 570           pi0 = to_next[0] = from[0];
 571           pi1 = to_next[1] = from[1];
 572
 573           from += 2;
 574           n_left_from -= 2;
 575           to_next += 2;
 576           n_left_to_next -= 2;
 577
 578           p0 = vlib_get_buffer (vm, pi0);
 579           p1 = vlib_get_buffer (vm, pi1);
 580
 581           ip0 = vlib_buffer_get_current (p0);
 582           ip1 = vlib_buffer_get_current (p1);
 583           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 584           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 585
 586           lb0 = load_balance_get (lbi0);
 587           lb1 = load_balance_get (lbi1);
 588
 589           /*
 590            * this node is for via FIBs we can re-use the hash value from the
 591            * to node if present.
 592            * We don't want to use the same hash value at each level in the recursion
 593            * graph as that would lead to polarisation
 594            */
 595           hc0 = hc1 = 0;
 596
 597           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 598             {
 599               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 600                 {
 601                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 602                     vnet_buffer (p0)->ip.flow_hash >> 1;
 603                 }
 604               else
 605                 {
 606                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 607                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 608                 }
 609               dpo0 =
 610                 load_balance_get_fwd_bucket (lb0,
 611                                              (hc0 &
 612                                               lb0->lb_n_buckets_minus_1));
 613             }
 614           else
 615             {
 616               dpo0 = load_balance_get_bucket_i (lb0, 0);
 617             }
 618           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 619             {
 620               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 621                 {
 622                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 623                     vnet_buffer (p1)->ip.flow_hash >> 1;
 624                 }
 625               else
 626                 {
 627                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 628                     ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 629                 }
 630               dpo1 =
 631                 load_balance_get_fwd_bucket (lb1,
 632                                              (hc1 &
 633                                               lb1->lb_n_buckets_minus_1));
 634             }
 635           else
 636             {
 637               dpo1 = load_balance_get_bucket_i (lb1, 0);
 638             }
 639
 640           next0 = dpo0->dpoi_next_node;
 641           next1 = dpo1->dpoi_next_node;
 642
 643           /* Only process the HBH Option Header if explicitly configured to do so */
 644           if (PREDICT_FALSE
 645               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 646             {
 647               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 648                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 649             }
 650           /* Only process the HBH Option Header if explicitly configured to do so */
 651           if (PREDICT_FALSE
 652               (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 653             {
 654               next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 655                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 656             }
 657
 658           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 659           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 660
 661           vlib_increment_combined_counter
 662             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 663           vlib_increment_combined_counter
 664             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 665
 666           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 667                                            to_next, n_left_to_next,
 668                                            pi0, pi1, next0, next1);
 669         }
 670
 671       while (n_left_from > 0 && n_left_to_next > 0)
 672         {
 673           ip_lookup_next_t next0;
 674           const load_balance_t *lb0;
 675           vlib_buffer_t *p0;
 676           u32 pi0, lbi0, hc0;
 677           const ip6_header_t *ip0;
 678           const dpo_id_t *dpo0;
 679
 680           pi0 = from[0];
 681           to_next[0] = pi0;
 682           from += 1;
 683           to_next += 1;
 684           n_left_to_next -= 1;
 685           n_left_from -= 1;
 686
 687           p0 = vlib_get_buffer (vm, pi0);
 688
 689           ip0 = vlib_buffer_get_current (p0);
 690           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 691
 692           lb0 = load_balance_get (lbi0);
 693
 694           hc0 = 0;
 695           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 696             {
 697               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 698                 {
 699                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 700                     vnet_buffer (p0)->ip.flow_hash >> 1;
 701                 }
 702               else
 703                 {
 704                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 705                     ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 706                 }
 707               dpo0 =
 708                 load_balance_get_fwd_bucket (lb0,
 709                                              (hc0 &
 710                                               lb0->lb_n_buckets_minus_1));
 711             }
 712           else
 713             {
 714               dpo0 = load_balance_get_bucket_i (lb0, 0);
 715             }
 716
 717           next0 = dpo0->dpoi_next_node;
 718           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 719
 720           /* Only process the HBH Option Header if explicitly configured to do so */
 721           if (PREDICT_FALSE
 722               (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 723             {
 724               next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 725                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 726             }
 727
 728           vlib_increment_combined_counter
 729             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 730
 731           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 732                                            to_next, n_left_to_next,
 733                                            pi0, next0);
 734         }
 735
 736       vlib_put_next_frame (vm, node, next, n_left_to_next);
 737     }
 738
 739   return frame->n_vectors;
 740 }
 741
 742 /* *INDENT-OFF* */
 743 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 744 {
 745   .function = ip6_load_balance,
 746   .name = "ip6-load-balance",
 747   .vector_size = sizeof (u32),
 748   .sibling_of = "ip6-lookup",
 749   .format_trace = format_ip6_lookup_trace,
 750 };
 751 /* *INDENT-ON* */
 752
 753 VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance);
 754
 755 typedef struct
 756 {
 757   /* Adjacency taken. */
 758   u32 adj_index;
 759   u32 flow_hash;
 760   u32 fib_index;
 761
 762   /* Packet data, possibly *after* rewrite. */
 763   u8 packet_data[128 - 1 * sizeof (u32)];
 764 }
 765 ip6_forward_next_trace_t;
 766
 767 u8 *
 768 format_ip6_forward_next_trace (u8 * s, va_list * args)
 769 {
 770   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 771   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 772   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 773   u32 indent = format_get_indent (s);
 774
 775   s = format (s, "%U%U",
 776               format_white_space, indent,
 777               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 778   return s;
 779 }
 780
 781 static u8 *
 782 format_ip6_lookup_trace (u8 * s, va_list * args)
 783 {
 784   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 785   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 786   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 787   u32 indent = format_get_indent (s);
 788
 789   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 790               t->fib_index, t->adj_index, t->flow_hash);
 791   s = format (s, "\n%U%U",
 792               format_white_space, indent,
 793               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 794   return s;
 795 }
 796
 797
 798 static u8 *
 799 format_ip6_rewrite_trace (u8 * s, va_list * args)
 800 {
 801   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 802   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 803   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 804   u32 indent = format_get_indent (s);
 805
 806   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 807               t->fib_index, t->adj_index, format_ip_adjacency,
 808               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 809   s = format (s, "\n%U%U",
 810               format_white_space, indent,
 811               format_ip_adjacency_packet_data,
 812               t->adj_index, t->packet_data, sizeof (t->packet_data));
 813   return s;
 814 }
 815
 816 /* Common trace function for all ip6-forward next nodes. */
 817 void
 818 ip6_forward_next_trace (vlib_main_t * vm,
 819                         vlib_node_runtime_t * node,
 820                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 821 {
 822   u32 *from, n_left;
 823   ip6_main_t *im = &ip6_main;
 824
 825   n_left = frame->n_vectors;
 826   from = vlib_frame_vector_args (frame);
 827
 828   while (n_left >= 4)
 829     {
 830       u32 bi0, bi1;
 831       vlib_buffer_t *b0, *b1;
 832       ip6_forward_next_trace_t *t0, *t1;
 833
 834       /* Prefetch next iteration. */
 835       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 836       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 837
 838       bi0 = from[0];
 839       bi1 = from[1];
 840
 841       b0 = vlib_get_buffer (vm, bi0);
 842       b1 = vlib_get_buffer (vm, bi1);
 843
 844       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 845         {
 846           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 847           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 848           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 849           t0->fib_index =
 850             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 851              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 852             vec_elt (im->fib_index_by_sw_if_index,
 853                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 854
 855           clib_memcpy (t0->packet_data,
 856                        vlib_buffer_get_current (b0),
 857                        sizeof (t0->packet_data));
 858         }
 859       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 860         {
 861           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 862           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 863           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 864           t1->fib_index =
 865             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 866              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 867             vec_elt (im->fib_index_by_sw_if_index,
 868                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 869
 870           clib_memcpy (t1->packet_data,
 871                        vlib_buffer_get_current (b1),
 872                        sizeof (t1->packet_data));
 873         }
 874       from += 2;
 875       n_left -= 2;
 876     }
 877
 878   while (n_left >= 1)
 879     {
 880       u32 bi0;
 881       vlib_buffer_t *b0;
 882       ip6_forward_next_trace_t *t0;
 883
 884       bi0 = from[0];
 885
 886       b0 = vlib_get_buffer (vm, bi0);
 887
 888       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 889         {
 890           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 891           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 892           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 893           t0->fib_index =
 894             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 895              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 896             vec_elt (im->fib_index_by_sw_if_index,
 897                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 898
 899           clib_memcpy (t0->packet_data,
 900                        vlib_buffer_get_current (b0),
 901                        sizeof (t0->packet_data));
 902         }
 903       from += 1;
 904       n_left -= 1;
 905     }
 906 }
 907
 908 /* Compute TCP/UDP/ICMP6 checksum in software. */
 909 u16
 910 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
 911                                    ip6_header_t * ip0, int *bogus_lengthp)
 912 {
 913   ip_csum_t sum0;
 914   u16 sum16, payload_length_host_byte_order;
 915   u32 i, n_this_buffer, n_bytes_left;
 916   u32 headers_size = sizeof (ip0[0]);
 917   void *data_this_buffer;
 918
 919   ASSERT (bogus_lengthp);
 920   *bogus_lengthp = 0;
 921
 922   /* Initialize checksum with ip header. */
 923   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
 924   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
 925   data_this_buffer = (void *) (ip0 + 1);
 926
 927   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
 928     {
 929       sum0 = ip_csum_with_carry (sum0,
 930                                  clib_mem_unaligned (&ip0->
 931                                                      src_address.as_uword[i],
 932                                                      uword));
 933       sum0 =
 934         ip_csum_with_carry (sum0,
 935                             clib_mem_unaligned (&ip0->dst_address.as_uword[i],
 936                                                 uword));
 937     }
 938
 939   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
 940    * or UDP-Ping packets */
 941   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 942     {
 943       u32 skip_bytes;
 944       ip6_hop_by_hop_ext_t *ext_hdr =
 945         (ip6_hop_by_hop_ext_t *) data_this_buffer;
 946
 947       /* validate really icmp6 next */
 948       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
 949               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
 950
 951       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
 952       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
 953
 954       payload_length_host_byte_order -= skip_bytes;
 955       headers_size += skip_bytes;
 956     }
 957
 958   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
 959   if (p0 && n_this_buffer + headers_size > p0->current_length)
 960     n_this_buffer =
 961       p0->current_length >
 962       headers_size ? p0->current_length - headers_size : 0;
 963   while (1)
 964     {
 965       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
 966       n_bytes_left -= n_this_buffer;
 967       if (n_bytes_left == 0)
 968         break;
 969
 970       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
 971         {
 972           *bogus_lengthp = 1;
 973           return 0xfefe;
 974         }
 975       p0 = vlib_get_buffer (vm, p0->next_buffer);
 976       data_this_buffer = vlib_buffer_get_current (p0);
 977       n_this_buffer = p0->current_length;
 978     }
 979
 980   sum16 = ~ip_csum_fold (sum0);
 981
 982   return sum16;
 983 }
 984
 985 u32
 986 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
 987 {
 988   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
 989   udp_header_t *udp0;
 990   u16 sum16;
 991   int bogus_length;
 992
 993   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
 994   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
 995           || ip0->protocol == IP_PROTOCOL_ICMP6
 996           || ip0->protocol == IP_PROTOCOL_UDP
 997           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
 998
 999   udp0 = (void *) (ip0 + 1);
1000   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1001     {
1002       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1003                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1004       return p0->flags;
1005     }
1006
1007   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1008
1009   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1010                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1011
1012   return p0->flags;
1013 }
1014
1015 /**
1016  * @brief returns number of links on which src is reachable.
1017  */
1018 always_inline int
1019 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1020 {
1021   const load_balance_t *lb0;
1022   index_t lbi;
1023   u32 fib_index;
1024
1025   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1026                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1027   fib_index =
1028     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1029     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1030
1031   lbi = ip6_fib_table_fwding_lookup (im, fib_index, &i->src_address);
1032   lb0 = load_balance_get (lbi);
1033
1034   return (fib_urpf_check_size (lb0->lb_urpf));
1035 }
1036
1037 always_inline u8
1038 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1039                            u32 * udp_offset0)
1040 {
1041   u32 proto0;
1042   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1043   if (proto0 != IP_PROTOCOL_UDP)
1044     {
1045       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1046       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1047     }
1048   return proto0;
1049 }
1050
1051 /* *INDENT-OFF* */
1052 VNET_FEATURE_ARC_INIT (ip6_local) =
1053 {
1054   .arc_name  = "ip6-local",
1055   .start_nodes = VNET_FEATURES ("ip6-local"),
1056 };
1057 /* *INDENT-ON* */
1058
1059 static uword
1060 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1061                   vlib_frame_t * frame, int head_of_feature_arc)
1062 {
1063   ip6_main_t *im = &ip6_main;
1064   ip_lookup_main_t *lm = &im->lookup_main;
1065   ip_local_next_t next_index;
1066   u32 *from, *to_next, n_left_from, n_left_to_next;
1067   vlib_node_runtime_t *error_node =
1068     vlib_node_get_runtime (vm, ip6_input_node.index);
1069   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1070
1071   from = vlib_frame_vector_args (frame);
1072   n_left_from = frame->n_vectors;
1073   next_index = node->cached_next_index;
1074
1075   if (node->flags & VLIB_NODE_FLAG_TRACE)
1076     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1077
1078   while (n_left_from > 0)
1079     {
1080       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1081
1082       while (n_left_from >= 4 && n_left_to_next >= 2)
1083         {
1084           vlib_buffer_t *p0, *p1;
1085           ip6_header_t *ip0, *ip1;
1086           udp_header_t *udp0, *udp1;
1087           u32 pi0, ip_len0, udp_len0, flags0, next0;
1088           u32 pi1, ip_len1, udp_len1, flags1, next1;
1089           i32 len_diff0, len_diff1;
1090           u8 error0, type0, good_l4_csum0, is_tcp_udp0;
1091           u8 error1, type1, good_l4_csum1, is_tcp_udp1;
1092           u32 udp_offset0, udp_offset1;
1093
1094           pi0 = to_next[0] = from[0];
1095           pi1 = to_next[1] = from[1];
1096           from += 2;
1097           n_left_from -= 2;
1098           to_next += 2;
1099           n_left_to_next -= 2;
1100
1101           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1102
1103           p0 = vlib_get_buffer (vm, pi0);
1104           p1 = vlib_get_buffer (vm, pi1);
1105
1106           ip0 = vlib_buffer_get_current (p0);
1107           ip1 = vlib_buffer_get_current (p1);
1108
1109           if (head_of_feature_arc == 0)
1110             goto skip_checks;
1111
1112           vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1113           vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1114
1115           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1116           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1117
1118           flags0 = p0->flags;
1119           flags1 = p1->flags;
1120
1121           is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0);
1122           is_tcp_udp1 = ip6_next_proto_is_tcp_udp (p1, ip1, &udp_offset1);
1123
1124           good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1125                            || (flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1126                                || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1127             != 0;
1128           good_l4_csum1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1129                            || (flags1 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1130                                || flags1 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1131             != 0;
1132           len_diff0 = 0;
1133           len_diff1 = 0;
1134
1135           if (PREDICT_TRUE (is_tcp_udp0))
1136             {
1137               udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
1138               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1139               good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
1140                 && udp0->checksum == 0;
1141               /* Verify UDP length. */
1142               if (is_tcp_udp0 == IP_PROTOCOL_UDP)
1143                 {
1144                   ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1145                   udp_len0 = clib_net_to_host_u16 (udp0->length);
1146                   len_diff0 = ip_len0 - udp_len0;
1147                 }
1148             }
1149           if (PREDICT_TRUE (is_tcp_udp1))
1150             {
1151               udp1 = (udp_header_t *) ((u8 *) ip1 + udp_offset1);
1152               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1153               good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP
1154                 && udp1->checksum == 0;
1155               /* Verify UDP length. */
1156               if (is_tcp_udp1 == IP_PROTOCOL_UDP)
1157                 {
1158                   ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1159                   udp_len1 = clib_net_to_host_u16 (udp1->length);
1160                   len_diff1 = ip_len1 - udp_len1;
1161                 }
1162             }
1163
1164           good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1165           good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1166
1167           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1168           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1169
1170           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1171                              && !good_l4_csum0
1172                              && !(flags0 &
1173                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1174             {
1175               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1176               good_l4_csum0 =
1177                 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1178             }
1179           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1180                              && !good_l4_csum1
1181                              && !(flags1 &
1182                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1183             {
1184               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1185               good_l4_csum1 =
1186                 (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1187             }
1188
1189           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1190           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1191           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1192
1193           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1194                   IP6_ERROR_UDP_CHECKSUM);
1195           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1196                   IP6_ERROR_ICMP_CHECKSUM);
1197           error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
1198           error1 = (!good_l4_csum1 ? IP6_ERROR_UDP_CHECKSUM + type1 : error1);
1199
1200           /* Drop packets from unroutable hosts. */
1201           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1202           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1203               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1204               !ip6_address_is_link_local_unicast (&ip0->src_address))
1205             {
1206               error0 = (!ip6_urpf_loose_check (im, p0, ip0)
1207                         ? IP6_ERROR_SRC_LOOKUP_MISS : error0);
1208             }
1209           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1210               type1 != IP_BUILTIN_PROTOCOL_ICMP &&
1211               !ip6_address_is_link_local_unicast (&ip1->src_address))
1212             {
1213               error1 = (!ip6_urpf_loose_check (im, p1, ip1)
1214                         ? IP6_ERROR_SRC_LOOKUP_MISS : error1);
1215             }
1216
1217           vnet_buffer (p0)->ip.fib_index =
1218             vnet_buffer (p0)->sw_if_index[VLIB_TX] != ~0 ?
1219             vnet_buffer (p0)->sw_if_index[VLIB_TX] :
1220             vnet_buffer (p0)->ip.fib_index;
1221
1222           vnet_buffer (p1)->ip.fib_index =
1223             vnet_buffer (p1)->sw_if_index[VLIB_TX] != ~0 ?
1224             vnet_buffer (p1)->sw_if_index[VLIB_TX] :
1225             vnet_buffer (p1)->ip.fib_index;
1226
1227         skip_checks:
1228
1229           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1230           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1231
1232           next0 =
1233             error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1234           next1 =
1235             error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1236
1237           p0->error = error_node->errors[error0];
1238           p1->error = error_node->errors[error1];
1239
1240           if (head_of_feature_arc)
1241             {
1242               if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1243                 vnet_feature_arc_start (arc_index,
1244                                         vnet_buffer (p0)->sw_if_index
1245                                         [VLIB_RX], &next0, p0);
1246               if (PREDICT_TRUE (error1 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1247                 vnet_feature_arc_start (arc_index,
1248                                         vnet_buffer (p1)->sw_if_index
1249                                         [VLIB_RX], &next1, p1);
1250             }
1251
1252           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1253                                            to_next, n_left_to_next,
1254                                            pi0, pi1, next0, next1);
1255         }
1256
1257       while (n_left_from > 0 && n_left_to_next > 0)
1258         {
1259           vlib_buffer_t *p0;
1260           ip6_header_t *ip0;
1261           udp_header_t *udp0;
1262           u32 pi0, ip_len0, udp_len0, flags0, next0;
1263           i32 len_diff0;
1264           u8 error0, type0, good_l4_csum0;
1265           u32 udp_offset0;
1266           u8 is_tcp_udp0;
1267
1268           pi0 = to_next[0] = from[0];
1269           from += 1;
1270           n_left_from -= 1;
1271           to_next += 1;
1272           n_left_to_next -= 1;
1273
1274           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1275
1276           p0 = vlib_get_buffer (vm, pi0);
1277           ip0 = vlib_buffer_get_current (p0);
1278
1279           if (head_of_feature_arc == 0)
1280             goto skip_check;
1281
1282           vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1283
1284           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1285           flags0 = p0->flags;
1286           is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0);
1287           good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT
1288                            || (flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM
1289                                || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
1290             != 0;
1291
1292           len_diff0 = 0;
1293           if (PREDICT_TRUE (is_tcp_udp0))
1294             {
1295               udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
1296               /* Don't verify UDP checksum for packets with explicit zero
1297                * checksum. */
1298               good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
1299                 && udp0->checksum == 0;
1300               /* Verify UDP length. */
1301               if (is_tcp_udp0 == IP_PROTOCOL_UDP)
1302                 {
1303                   ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1304                   udp_len0 = clib_net_to_host_u16 (udp0->length);
1305                   len_diff0 = ip_len0 - udp_len0;
1306                 }
1307             }
1308
1309           good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1310           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1311
1312           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1313                              && !good_l4_csum0
1314                              && !(flags0 &
1315                                   VNET_BUFFER_F_L4_CHECKSUM_COMPUTED)))
1316             {
1317               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1318               good_l4_csum0 =
1319                 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1320             }
1321
1322           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1323           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1324
1325           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1326                   IP6_ERROR_UDP_CHECKSUM);
1327           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1328                   IP6_ERROR_ICMP_CHECKSUM);
1329           error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
1330
1331           /* If this is a neighbor solicitation (ICMP), skip src RPF check */
1332           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1333               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1334               !ip6_address_is_link_local_unicast (&ip0->src_address))
1335             {
1336               error0 = (!ip6_urpf_loose_check (im, p0, ip0)
1337                         ? IP6_ERROR_SRC_LOOKUP_MISS : error0);
1338             }
1339
1340           vnet_buffer (p0)->ip.fib_index =
1341             vnet_buffer (p0)->sw_if_index[VLIB_TX] != ~0 ?
1342             vnet_buffer (p0)->sw_if_index[VLIB_TX] :
1343             vnet_buffer (p0)->ip.fib_index;
1344
1345         skip_check:
1346
1347           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1348           next0 =
1349             error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1350
1351           p0->error = error_node->errors[error0];
1352
1353           if (head_of_feature_arc)
1354             {
1355               if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1356                 vnet_feature_arc_start (arc_index,
1357                                         vnet_buffer (p0)->sw_if_index
1358                                         [VLIB_RX], &next0, p0);
1359             }
1360
1361           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1362                                            to_next, n_left_to_next,
1363                                            pi0, next0);
1364         }
1365
1366       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1367     }
1368
1369   return frame->n_vectors;
1370 }
1371
1372 static uword
1373 ip6_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1374 {
1375   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1376 }
1377
1378 /* *INDENT-OFF* */
1379 VLIB_REGISTER_NODE (ip6_local_node, static) =
1380 {
1381   .function = ip6_local,
1382   .name = "ip6-local",
1383   .vector_size = sizeof (u32),
1384   .format_trace = format_ip6_forward_next_trace,
1385   .n_next_nodes = IP_LOCAL_N_NEXT,
1386   .next_nodes =
1387   {
1388     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1389     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1390     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1391     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1392   },
1393 };
1394 /* *INDENT-ON* */
1395
1396 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local);
1397
1398
1399 static uword
1400 ip6_local_end_of_arc (vlib_main_t * vm,
1401                       vlib_node_runtime_t * node, vlib_frame_t * frame)
1402 {
1403   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1404 }
1405
1406 /* *INDENT-OFF* */
1407 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node,static) = {
1408   .function = ip6_local_end_of_arc,
1409   .name = "ip6-local-end-of-arc",
1410   .vector_size = sizeof (u32),
1411
1412   .format_trace = format_ip6_forward_next_trace,
1413   .sibling_of = "ip6-local",
1414 };
1415
1416 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_end_of_arc_node, ip6_local_end_of_arc)
1417
1418 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1419   .arc_name = "ip6-local",
1420   .node_name = "ip6-local-end-of-arc",
1421   .runs_before = 0, /* not before any other features */
1422 };
1423 /* *INDENT-ON* */
1424
1425 void
1426 ip6_register_protocol (u32 protocol, u32 node_index)
1427 {
1428   vlib_main_t *vm = vlib_get_main ();
1429   ip6_main_t *im = &ip6_main;
1430   ip_lookup_main_t *lm = &im->lookup_main;
1431
1432   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1433   lm->local_next_by_ip_protocol[protocol] =
1434     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1435 }
1436
1437 clib_error_t *
1438 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1439                     u8 refresh)
1440 {
1441   vnet_main_t *vnm = vnet_get_main ();
1442   ip6_main_t *im = &ip6_main;
1443   icmp6_neighbor_solicitation_header_t *h;
1444   ip6_address_t *src;
1445   ip_interface_address_t *ia;
1446   ip_adjacency_t *adj;
1447   vnet_hw_interface_t *hi;
1448   vnet_sw_interface_t *si;
1449   vlib_buffer_t *b;
1450   adj_index_t ai;
1451   u32 bi = 0;
1452   int bogus_length;
1453
1454   si = vnet_get_sw_interface (vnm, sw_if_index);
1455
1456   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1457     {
1458       return clib_error_return (0, "%U: interface %U down",
1459                                 format_ip6_address, dst,
1460                                 format_vnet_sw_if_index_name, vnm,
1461                                 sw_if_index);
1462     }
1463
1464   src =
1465     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1466   if (!src)
1467     {
1468       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1469       return clib_error_return
1470         (0, "no matching interface address for destination %U (interface %U)",
1471          format_ip6_address, dst,
1472          format_vnet_sw_if_index_name, vnm, sw_if_index);
1473     }
1474
1475   h =
1476     vlib_packet_template_get_packet (vm,
1477                                      &im->discover_neighbor_packet_template,
1478                                      &bi);
1479
1480   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1481
1482   /* Destination address is a solicited node multicast address.  We need to fill in
1483      the low 24 bits with low 24 bits of target's address. */
1484   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1485   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1486   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1487
1488   h->ip.src_address = src[0];
1489   h->neighbor.target_address = dst[0];
1490
1491   if (PREDICT_FALSE (!hi->hw_address))
1492     {
1493       return clib_error_return (0, "%U: interface %U do not support ip probe",
1494                                 format_ip6_address, dst,
1495                                 format_vnet_sw_if_index_name, vnm,
1496                                 sw_if_index);
1497     }
1498
1499   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address,
1500                vec_len (hi->hw_address));
1501
1502   h->neighbor.icmp.checksum =
1503     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1504   ASSERT (bogus_length == 0);
1505
1506   b = vlib_get_buffer (vm, bi);
1507   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1508     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1509
1510   /* Add encapsulation string for software interface (e.g. ethernet header). */
1511   ip46_address_t nh = {
1512     .ip6 = *dst,
1513   };
1514
1515   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1516                             VNET_LINK_IP6, &nh, sw_if_index);
1517   adj = adj_get (ai);
1518
1519   /* Peer has been previously resolved, retrieve glean adj instead */
1520   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1521     {
1522       adj_unlock (ai);
1523       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1524                                   VNET_LINK_IP6, sw_if_index, &nh);
1525       adj = adj_get (ai);
1526     }
1527
1528   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1529   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1530
1531   {
1532     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1533     u32 *to_next = vlib_frame_vector_args (f);
1534     to_next[0] = bi;
1535     f->n_vectors = 1;
1536     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1537   }
1538
1539   adj_unlock (ai);
1540   return /* no error */ 0;
1541 }
1542
1543 typedef enum
1544 {
1545   IP6_REWRITE_NEXT_DROP,
1546   IP6_REWRITE_NEXT_ICMP_ERROR,
1547   IP6_REWRITE_NEXT_FRAGMENT,
1548   IP6_REWRITE_N_NEXT            /* Last */
1549 } ip6_rewrite_next_t;
1550
1551 /**
1552  * This bits of an IPv6 address to mask to construct a multicast
1553  * MAC address
1554  */
1555 #define IP6_MCAST_ADDR_MASK 0xffffffff
1556
1557 always_inline void
1558 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1559                u16 adj_packet_bytes, bool is_locally_generated,
1560                u32 * next, u32 * error)
1561 {
1562   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1563     {
1564       if (is_locally_generated)
1565         {
1566           /* IP fragmentation */
1567           ip_frag_set_vnet_buffer (b, 0, adj_packet_bytes,
1568                                    IP6_FRAG_NEXT_IP6_LOOKUP, 0);
1569           *next = IP6_REWRITE_NEXT_FRAGMENT;
1570         }
1571       else
1572         {
1573           *error = IP6_ERROR_MTU_EXCEEDED;
1574           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1575                                        adj_packet_bytes);
1576           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1577         }
1578     }
1579 }
1580
1581 always_inline uword
1582 ip6_rewrite_inline (vlib_main_t * vm,
1583                     vlib_node_runtime_t * node,
1584                     vlib_frame_t * frame,
1585                     int do_counters, int is_midchain, int is_mcast)
1586 {
1587   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1588   u32 *from = vlib_frame_vector_args (frame);
1589   u32 n_left_from, n_left_to_next, *to_next, next_index;
1590   vlib_node_runtime_t *error_node =
1591     vlib_node_get_runtime (vm, ip6_input_node.index);
1592
1593   n_left_from = frame->n_vectors;
1594   next_index = node->cached_next_index;
1595   u32 thread_index = vlib_get_thread_index ();
1596
1597   while (n_left_from > 0)
1598     {
1599       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1600
1601       while (n_left_from >= 4 && n_left_to_next >= 2)
1602         {
1603           ip_adjacency_t *adj0, *adj1;
1604           vlib_buffer_t *p0, *p1;
1605           ip6_header_t *ip0, *ip1;
1606           u32 pi0, rw_len0, next0, error0, adj_index0;
1607           u32 pi1, rw_len1, next1, error1, adj_index1;
1608           u32 tx_sw_if_index0, tx_sw_if_index1;
1609           bool is_locally_originated0, is_locally_originated1;
1610
1611           /* Prefetch next iteration. */
1612           {
1613             vlib_buffer_t *p2, *p3;
1614
1615             p2 = vlib_get_buffer (vm, from[2]);
1616             p3 = vlib_get_buffer (vm, from[3]);
1617
1618             vlib_prefetch_buffer_header (p2, LOAD);
1619             vlib_prefetch_buffer_header (p3, LOAD);
1620
1621             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1622             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1623
1624             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1625             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1626           }
1627
1628           pi0 = to_next[0] = from[0];
1629           pi1 = to_next[1] = from[1];
1630
1631           from += 2;
1632           n_left_from -= 2;
1633           to_next += 2;
1634           n_left_to_next -= 2;
1635
1636           p0 = vlib_get_buffer (vm, pi0);
1637           p1 = vlib_get_buffer (vm, pi1);
1638
1639           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1640           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1641
1642           ip0 = vlib_buffer_get_current (p0);
1643           ip1 = vlib_buffer_get_current (p1);
1644
1645           error0 = error1 = IP6_ERROR_NONE;
1646           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1647
1648           is_locally_originated0 =
1649             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1650           if (PREDICT_TRUE (!is_locally_originated0))
1651             {
1652               i32 hop_limit0 = ip0->hop_limit;
1653
1654               /* Input node should have reject packets with hop limit 0. */
1655               ASSERT (ip0->hop_limit > 0);
1656
1657               hop_limit0 -= 1;
1658
1659               ip0->hop_limit = hop_limit0;
1660
1661               /*
1662                * If the hop count drops below 1 when forwarding, generate
1663                * an ICMP response.
1664                */
1665               if (PREDICT_FALSE (hop_limit0 <= 0))
1666                 {
1667                   error0 = IP6_ERROR_TIME_EXPIRED;
1668                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1669                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1670                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1671                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1672                                                0);
1673                 }
1674             }
1675           else
1676             {
1677               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1678             }
1679           is_locally_originated1 =
1680             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1681           if (PREDICT_TRUE (!is_locally_originated1))
1682             {
1683               i32 hop_limit1 = ip1->hop_limit;
1684
1685               /* Input node should have reject packets with hop limit 0. */
1686               ASSERT (ip1->hop_limit > 0);
1687
1688               hop_limit1 -= 1;
1689
1690               ip1->hop_limit = hop_limit1;
1691
1692               /*
1693                * If the hop count drops below 1 when forwarding, generate
1694                * an ICMP response.
1695                */
1696               if (PREDICT_FALSE (hop_limit1 <= 0))
1697                 {
1698                   error1 = IP6_ERROR_TIME_EXPIRED;
1699                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1700                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1701                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1702                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1703                                                0);
1704                 }
1705             }
1706           else
1707             {
1708               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1709             }
1710           adj0 = adj_get (adj_index0);
1711           adj1 = adj_get (adj_index1);
1712
1713           rw_len0 = adj0[0].rewrite_header.data_bytes;
1714           rw_len1 = adj1[0].rewrite_header.data_bytes;
1715           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1716           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1717
1718           if (do_counters)
1719             {
1720               vlib_increment_combined_counter
1721                 (&adjacency_counters,
1722                  thread_index, adj_index0, 1,
1723                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1724               vlib_increment_combined_counter
1725                 (&adjacency_counters,
1726                  thread_index, adj_index1, 1,
1727                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1728             }
1729
1730           /* Check MTU of outgoing interface. */
1731           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1732                          sizeof (ip6_header_t),
1733                          adj0[0].rewrite_header.max_l3_packet_bytes,
1734                          is_locally_originated0, &next0, &error0);
1735           ip6_mtu_check (p1, clib_net_to_host_u16 (ip1->payload_length) +
1736                          sizeof (ip6_header_t),
1737                          adj1[0].rewrite_header.max_l3_packet_bytes,
1738                          is_locally_originated1, &next1, &error1);
1739
1740           /* Don't adjust the buffer for hop count issue; icmp-error node
1741            * wants to see the IP headerr */
1742           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1743             {
1744               p0->current_data -= rw_len0;
1745               p0->current_length += rw_len0;
1746
1747               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1748               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1749               next0 = adj0[0].rewrite_header.next_index;
1750
1751               if (PREDICT_FALSE
1752                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1753                 vnet_feature_arc_start (lm->output_feature_arc_index,
1754                                         tx_sw_if_index0, &next0, p0);
1755             }
1756           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1757             {
1758               p1->current_data -= rw_len1;
1759               p1->current_length += rw_len1;
1760
1761               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1762               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1763               next1 = adj1[0].rewrite_header.next_index;
1764
1765               if (PREDICT_FALSE
1766                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1767                 vnet_feature_arc_start (lm->output_feature_arc_index,
1768                                         tx_sw_if_index1, &next1, p1);
1769             }
1770
1771           /* Guess we are only writing on simple Ethernet header. */
1772           vnet_rewrite_two_headers (adj0[0], adj1[0],
1773                                     ip0, ip1, sizeof (ethernet_header_t));
1774
1775           if (is_midchain)
1776             {
1777               adj0->sub_type.midchain.fixup_func
1778                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1779               adj1->sub_type.midchain.fixup_func
1780                 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1781             }
1782           if (is_mcast)
1783             {
1784               /*
1785                * copy bytes from the IP address into the MAC rewrite
1786                */
1787               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1788                                           adj0->
1789                                           rewrite_header.dst_mcast_offset,
1790                                           &ip0->dst_address.as_u32[3],
1791                                           (u8 *) ip0);
1792               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1793                                           adj1->
1794                                           rewrite_header.dst_mcast_offset,
1795                                           &ip1->dst_address.as_u32[3],
1796                                           (u8 *) ip1);
1797             }
1798
1799           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1800                                            to_next, n_left_to_next,
1801                                            pi0, pi1, next0, next1);
1802         }
1803
1804       while (n_left_from > 0 && n_left_to_next > 0)
1805         {
1806           ip_adjacency_t *adj0;
1807           vlib_buffer_t *p0;
1808           ip6_header_t *ip0;
1809           u32 pi0, rw_len0;
1810           u32 adj_index0, next0, error0;
1811           u32 tx_sw_if_index0;
1812           bool is_locally_originated0;
1813
1814           pi0 = to_next[0] = from[0];
1815
1816           p0 = vlib_get_buffer (vm, pi0);
1817
1818           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1819
1820           adj0 = adj_get (adj_index0);
1821
1822           ip0 = vlib_buffer_get_current (p0);
1823
1824           error0 = IP6_ERROR_NONE;
1825           next0 = IP6_REWRITE_NEXT_DROP;
1826
1827           /* Check hop limit */
1828           is_locally_originated0 =
1829             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1830           if (PREDICT_TRUE (!is_locally_originated0))
1831             {
1832               i32 hop_limit0 = ip0->hop_limit;
1833
1834               ASSERT (ip0->hop_limit > 0);
1835
1836               hop_limit0 -= 1;
1837
1838               ip0->hop_limit = hop_limit0;
1839
1840               if (PREDICT_FALSE (hop_limit0 <= 0))
1841                 {
1842                   /*
1843                    * If the hop count drops below 1 when forwarding, generate
1844                    * an ICMP response.
1845                    */
1846                   error0 = IP6_ERROR_TIME_EXPIRED;
1847                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1848                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1849                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1850                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1851                                                0);
1852                 }
1853             }
1854           else
1855             {
1856               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1857             }
1858
1859           /* Guess we are only writing on simple Ethernet header. */
1860           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1861
1862           /* Update packet buffer attributes/set output interface. */
1863           rw_len0 = adj0[0].rewrite_header.data_bytes;
1864           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1865
1866           if (do_counters)
1867             {
1868               vlib_increment_combined_counter
1869                 (&adjacency_counters,
1870                  thread_index, adj_index0, 1,
1871                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1872             }
1873
1874           /* Check MTU of outgoing interface. */
1875           ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
1876                          sizeof (ip6_header_t),
1877                          adj0[0].rewrite_header.max_l3_packet_bytes,
1878                          is_locally_originated0, &next0, &error0);
1879
1880           /* Don't adjust the buffer for hop count issue; icmp-error node
1881            * wants to see the IP header */
1882           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1883             {
1884               p0->current_data -= rw_len0;
1885               p0->current_length += rw_len0;
1886
1887               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1888
1889               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1890               next0 = adj0[0].rewrite_header.next_index;
1891
1892               if (PREDICT_FALSE
1893                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1894                 vnet_feature_arc_start (lm->output_feature_arc_index,
1895                                         tx_sw_if_index0, &next0, p0);
1896             }
1897
1898           if (is_midchain)
1899             {
1900               adj0->sub_type.midchain.fixup_func
1901                 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1902             }
1903           if (is_mcast)
1904             {
1905               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1906                                           adj0->
1907                                           rewrite_header.dst_mcast_offset,
1908                                           &ip0->dst_address.as_u32[3],
1909                                           (u8 *) ip0);
1910             }
1911
1912           p0->error = error_node->errors[error0];
1913
1914           from += 1;
1915           n_left_from -= 1;
1916           to_next += 1;
1917           n_left_to_next -= 1;
1918
1919           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1920                                            to_next, n_left_to_next,
1921                                            pi0, next0);
1922         }
1923
1924       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1925     }
1926
1927   /* Need to do trace after rewrites to pick up new packet data. */
1928   if (node->flags & VLIB_NODE_FLAG_TRACE)
1929     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1930
1931   return frame->n_vectors;
1932 }
1933
1934 static uword
1935 ip6_rewrite (vlib_main_t * vm,
1936              vlib_node_runtime_t * node, vlib_frame_t * frame)
1937 {
1938   if (adj_are_counters_enabled ())
1939     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
1940   else
1941     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
1942 }
1943
1944 static uword
1945 ip6_rewrite_mcast (vlib_main_t * vm,
1946                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1947 {
1948   if (adj_are_counters_enabled ())
1949     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
1950   else
1951     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
1952 }
1953
1954 static uword
1955 ip6_midchain (vlib_main_t * vm,
1956               vlib_node_runtime_t * node, vlib_frame_t * frame)
1957 {
1958   if (adj_are_counters_enabled ())
1959     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
1960   else
1961     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
1962 }
1963
1964 static uword
1965 ip6_mcast_midchain (vlib_main_t * vm,
1966                     vlib_node_runtime_t * node, vlib_frame_t * frame)
1967 {
1968   if (adj_are_counters_enabled ())
1969     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
1970   else
1971     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
1972 }
1973
1974 /* *INDENT-OFF* */
1975 VLIB_REGISTER_NODE (ip6_midchain_node) =
1976 {
1977   .function = ip6_midchain,
1978   .name = "ip6-midchain",
1979   .vector_size = sizeof (u32),
1980   .format_trace = format_ip6_forward_next_trace,
1981   .sibling_of = "ip6-rewrite",
1982   };
1983 /* *INDENT-ON* */
1984
1985 VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain);
1986
1987 /* *INDENT-OFF* */
1988 VLIB_REGISTER_NODE (ip6_rewrite_node) =
1989 {
1990   .function = ip6_rewrite,
1991   .name = "ip6-rewrite",
1992   .vector_size = sizeof (u32),
1993   .format_trace = format_ip6_rewrite_trace,
1994   .n_next_nodes = IP6_REWRITE_N_NEXT,
1995   .next_nodes =
1996   {
1997     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
1998     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1999     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2000   },
2001 };
2002 /* *INDENT-ON* */
2003
2004 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite);
2005
2006 /* *INDENT-OFF* */
2007 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2008 {
2009   .function = ip6_rewrite_mcast,
2010   .name = "ip6-rewrite-mcast",
2011   .vector_size = sizeof (u32),
2012   .format_trace = format_ip6_rewrite_trace,
2013   .sibling_of = "ip6-rewrite",
2014 };
2015 /* *INDENT-ON* */
2016
2017 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_mcast_node, ip6_rewrite_mcast);
2018
2019 /* *INDENT-OFF* */
2020 VLIB_REGISTER_NODE (ip6_mcast_midchain_node, static) =
2021 {
2022   .function = ip6_mcast_midchain,
2023   .name = "ip6-mcast-midchain",
2024   .vector_size = sizeof (u32),
2025   .format_trace = format_ip6_rewrite_trace,
2026   .sibling_of = "ip6-rewrite",
2027 };
2028 /* *INDENT-ON* */
2029
2030 VLIB_NODE_FUNCTION_MULTIARCH (ip6_mcast_midchain_node, ip6_mcast_midchain);
2031
2032 /*
2033  * Hop-by-Hop handling
2034  */
2035 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2036
2037 #define foreach_ip6_hop_by_hop_error \
2038 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2039 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2040 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2041
2042 /* *INDENT-OFF* */
2043 typedef enum
2044 {
2045 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2046   foreach_ip6_hop_by_hop_error
2047 #undef _
2048   IP6_HOP_BY_HOP_N_ERROR,
2049 } ip6_hop_by_hop_error_t;
2050 /* *INDENT-ON* */
2051
2052 /*
2053  * Primary h-b-h handler trace support
2054  * We work pretty hard on the problem for obvious reasons
2055  */
2056 typedef struct
2057 {
2058   u32 next_index;
2059   u32 trace_len;
2060   u8 option_data[256];
2061 } ip6_hop_by_hop_trace_t;
2062
2063 vlib_node_registration_t ip6_hop_by_hop_node;
2064
2065 static char *ip6_hop_by_hop_error_strings[] = {
2066 #define _(sym,string) string,
2067   foreach_ip6_hop_by_hop_error
2068 #undef _
2069 };
2070
2071 u8 *
2072 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2073 {
2074   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2075   int total_len = va_arg (*args, int);
2076   ip6_hop_by_hop_option_t *opt0, *limit0;
2077   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2078   u8 type0;
2079
2080   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2081               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2082
2083   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2084   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2085
2086   while (opt0 < limit0)
2087     {
2088       type0 = opt0->type;
2089       switch (type0)
2090         {
2091         case 0:         /* Pad, just stop */
2092           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2093           break;
2094
2095         default:
2096           if (hm->trace[type0])
2097             {
2098               s = (*hm->trace[type0]) (s, opt0);
2099             }
2100           else
2101             {
2102               s =
2103                 format (s, "\n    unrecognized option %d length %d", type0,
2104                         opt0->length);
2105             }
2106           opt0 =
2107             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2108                                          sizeof (ip6_hop_by_hop_option_t));
2109           break;
2110         }
2111     }
2112   return s;
2113 }
2114
2115 static u8 *
2116 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2117 {
2118   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2119   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2120   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2121   ip6_hop_by_hop_header_t *hbh0;
2122   ip6_hop_by_hop_option_t *opt0, *limit0;
2123   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2124
2125   u8 type0;
2126
2127   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2128
2129   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2130               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2131
2132   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2133   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2134
2135   while (opt0 < limit0)
2136     {
2137       type0 = opt0->type;
2138       switch (type0)
2139         {
2140         case 0:         /* Pad, just stop */
2141           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2142           break;
2143
2144         default:
2145           if (hm->trace[type0])
2146             {
2147               s = (*hm->trace[type0]) (s, opt0);
2148             }
2149           else
2150             {
2151               s =
2152                 format (s, "\n    unrecognized option %d length %d", type0,
2153                         opt0->length);
2154             }
2155           opt0 =
2156             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2157                                          sizeof (ip6_hop_by_hop_option_t));
2158           break;
2159         }
2160     }
2161   return s;
2162 }
2163
2164 always_inline u8
2165 ip6_scan_hbh_options (vlib_buffer_t * b0,
2166                       ip6_header_t * ip0,
2167                       ip6_hop_by_hop_header_t * hbh0,
2168                       ip6_hop_by_hop_option_t * opt0,
2169                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2170 {
2171   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2172   u8 type0;
2173   u8 error0 = 0;
2174
2175   while (opt0 < limit0)
2176     {
2177       type0 = opt0->type;
2178       switch (type0)
2179         {
2180         case 0:         /* Pad1 */
2181           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2182           continue;
2183         case 1:         /* PadN */
2184           break;
2185         default:
2186           if (hm->options[type0])
2187             {
2188               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2189                 {
2190                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2191                   return (error0);
2192                 }
2193             }
2194           else
2195             {
2196               /* Unrecognized mandatory option, check the two high order bits */
2197               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2198                 {
2199                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2200                   break;
2201                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2202                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2203                   *next0 = IP_LOOKUP_NEXT_DROP;
2204                   break;
2205                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2206                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2207                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2208                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2209                                                ICMP6_parameter_problem_unrecognized_option,
2210                                                (u8 *) opt0 - (u8 *) ip0);
2211                   break;
2212                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2213                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2214                   if (!ip6_address_is_multicast (&ip0->dst_address))
2215                     {
2216                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2217                       icmp6_error_set_vnet_buffer (b0,
2218                                                    ICMP6_parameter_problem,
2219                                                    ICMP6_parameter_problem_unrecognized_option,
2220                                                    (u8 *) opt0 - (u8 *) ip0);
2221                     }
2222                   else
2223                     {
2224                       *next0 = IP_LOOKUP_NEXT_DROP;
2225                     }
2226                   break;
2227                 }
2228               return (error0);
2229             }
2230         }
2231       opt0 =
2232         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2233                                      sizeof (ip6_hop_by_hop_option_t));
2234     }
2235   return (error0);
2236 }
2237
2238 /*
2239  * Process the Hop-by-Hop Options header
2240  */
2241 static uword
2242 ip6_hop_by_hop (vlib_main_t * vm,
2243                 vlib_node_runtime_t * node, vlib_frame_t * frame)
2244 {
2245   vlib_node_runtime_t *error_node =
2246     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2247   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2248   u32 n_left_from, *from, *to_next;
2249   ip_lookup_next_t next_index;
2250
2251   from = vlib_frame_vector_args (frame);
2252   n_left_from = frame->n_vectors;
2253   next_index = node->cached_next_index;
2254
2255   while (n_left_from > 0)
2256     {
2257       u32 n_left_to_next;
2258
2259       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2260
2261       while (n_left_from >= 4 && n_left_to_next >= 2)
2262         {
2263           u32 bi0, bi1;
2264           vlib_buffer_t *b0, *b1;
2265           u32 next0, next1;
2266           ip6_header_t *ip0, *ip1;
2267           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2268           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2269           u8 error0 = 0, error1 = 0;
2270
2271           /* Prefetch next iteration. */
2272           {
2273             vlib_buffer_t *p2, *p3;
2274
2275             p2 = vlib_get_buffer (vm, from[2]);
2276             p3 = vlib_get_buffer (vm, from[3]);
2277
2278             vlib_prefetch_buffer_header (p2, LOAD);
2279             vlib_prefetch_buffer_header (p3, LOAD);
2280
2281             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2282             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2283           }
2284
2285           /* Speculatively enqueue b0, b1 to the current next frame */
2286           to_next[0] = bi0 = from[0];
2287           to_next[1] = bi1 = from[1];
2288           from += 2;
2289           to_next += 2;
2290           n_left_from -= 2;
2291           n_left_to_next -= 2;
2292
2293           b0 = vlib_get_buffer (vm, bi0);
2294           b1 = vlib_get_buffer (vm, bi1);
2295
2296           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2297           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2298           ip_adjacency_t *adj0 = adj_get (adj_index0);
2299           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2300           ip_adjacency_t *adj1 = adj_get (adj_index1);
2301
2302           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2303           next0 = adj0->lookup_next_index;
2304           next1 = adj1->lookup_next_index;
2305
2306           ip0 = vlib_buffer_get_current (b0);
2307           ip1 = vlib_buffer_get_current (b1);
2308           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2309           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2310           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2311           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2312           limit0 =
2313             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2314                                          ((hbh0->length + 1) << 3));
2315           limit1 =
2316             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2317                                          ((hbh1->length + 1) << 3));
2318
2319           /*
2320            * Basic validity checks
2321            */
2322           if ((hbh0->length + 1) << 3 >
2323               clib_net_to_host_u16 (ip0->payload_length))
2324             {
2325               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2326               next0 = IP_LOOKUP_NEXT_DROP;
2327               goto outdual;
2328             }
2329           /* Scan the set of h-b-h options, process ones that we understand */
2330           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2331
2332           if ((hbh1->length + 1) << 3 >
2333               clib_net_to_host_u16 (ip1->payload_length))
2334             {
2335               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2336               next1 = IP_LOOKUP_NEXT_DROP;
2337               goto outdual;
2338             }
2339           /* Scan the set of h-b-h options, process ones that we understand */
2340           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2341
2342         outdual:
2343           /* Has the classifier flagged this buffer for special treatment? */
2344           if (PREDICT_FALSE
2345               ((error0 == 0)
2346                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2347             next0 = hm->next_override;
2348
2349           /* Has the classifier flagged this buffer for special treatment? */
2350           if (PREDICT_FALSE
2351               ((error1 == 0)
2352                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2353             next1 = hm->next_override;
2354
2355           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2356             {
2357               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2358                 {
2359                   ip6_hop_by_hop_trace_t *t =
2360                     vlib_add_trace (vm, node, b0, sizeof (*t));
2361                   u32 trace_len = (hbh0->length + 1) << 3;
2362                   t->next_index = next0;
2363                   /* Capture the h-b-h option verbatim */
2364                   trace_len =
2365                     trace_len <
2366                     ARRAY_LEN (t->option_data) ? trace_len :
2367                     ARRAY_LEN (t->option_data);
2368                   t->trace_len = trace_len;
2369                   clib_memcpy (t->option_data, hbh0, trace_len);
2370                 }
2371               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2372                 {
2373                   ip6_hop_by_hop_trace_t *t =
2374                     vlib_add_trace (vm, node, b1, sizeof (*t));
2375                   u32 trace_len = (hbh1->length + 1) << 3;
2376                   t->next_index = next1;
2377                   /* Capture the h-b-h option verbatim */
2378                   trace_len =
2379                     trace_len <
2380                     ARRAY_LEN (t->option_data) ? trace_len :
2381                     ARRAY_LEN (t->option_data);
2382                   t->trace_len = trace_len;
2383                   clib_memcpy (t->option_data, hbh1, trace_len);
2384                 }
2385
2386             }
2387
2388           b0->error = error_node->errors[error0];
2389           b1->error = error_node->errors[error1];
2390
2391           /* verify speculative enqueue, maybe switch current next frame */
2392           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2393                                            n_left_to_next, bi0, bi1, next0,
2394                                            next1);
2395         }
2396
2397       while (n_left_from > 0 && n_left_to_next > 0)
2398         {
2399           u32 bi0;
2400           vlib_buffer_t *b0;
2401           u32 next0;
2402           ip6_header_t *ip0;
2403           ip6_hop_by_hop_header_t *hbh0;
2404           ip6_hop_by_hop_option_t *opt0, *limit0;
2405           u8 error0 = 0;
2406
2407           /* Speculatively enqueue b0 to the current next frame */
2408           bi0 = from[0];
2409           to_next[0] = bi0;
2410           from += 1;
2411           to_next += 1;
2412           n_left_from -= 1;
2413           n_left_to_next -= 1;
2414
2415           b0 = vlib_get_buffer (vm, bi0);
2416           /*
2417            * Default use the next_index from the adjacency.
2418            * A HBH option rarely redirects to a different node
2419            */
2420           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2421           ip_adjacency_t *adj0 = adj_get (adj_index0);
2422           next0 = adj0->lookup_next_index;
2423
2424           ip0 = vlib_buffer_get_current (b0);
2425           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2426           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2427           limit0 =
2428             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2429                                          ((hbh0->length + 1) << 3));
2430
2431           /*
2432            * Basic validity checks
2433            */
2434           if ((hbh0->length + 1) << 3 >
2435               clib_net_to_host_u16 (ip0->payload_length))
2436             {
2437               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2438               next0 = IP_LOOKUP_NEXT_DROP;
2439               goto out0;
2440             }
2441
2442           /* Scan the set of h-b-h options, process ones that we understand */
2443           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2444
2445         out0:
2446           /* Has the classifier flagged this buffer for special treatment? */
2447           if (PREDICT_FALSE
2448               ((error0 == 0)
2449                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2450             next0 = hm->next_override;
2451
2452           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2453             {
2454               ip6_hop_by_hop_trace_t *t =
2455                 vlib_add_trace (vm, node, b0, sizeof (*t));
2456               u32 trace_len = (hbh0->length + 1) << 3;
2457               t->next_index = next0;
2458               /* Capture the h-b-h option verbatim */
2459               trace_len =
2460                 trace_len <
2461                 ARRAY_LEN (t->option_data) ? trace_len :
2462                 ARRAY_LEN (t->option_data);
2463               t->trace_len = trace_len;
2464               clib_memcpy (t->option_data, hbh0, trace_len);
2465             }
2466
2467           b0->error = error_node->errors[error0];
2468
2469           /* verify speculative enqueue, maybe switch current next frame */
2470           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2471                                            n_left_to_next, bi0, next0);
2472         }
2473       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2474     }
2475   return frame->n_vectors;
2476 }
2477
2478 /* *INDENT-OFF* */
2479 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2480 {
2481   .function = ip6_hop_by_hop,
2482   .name = "ip6-hop-by-hop",
2483   .sibling_of = "ip6-lookup",
2484   .vector_size = sizeof (u32),
2485   .format_trace = format_ip6_hop_by_hop_trace,
2486   .type = VLIB_NODE_TYPE_INTERNAL,
2487   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2488   .error_strings = ip6_hop_by_hop_error_strings,
2489   .n_next_nodes = 0,
2490 };
2491 /* *INDENT-ON* */
2492
2493 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
2494
2495 static clib_error_t *
2496 ip6_hop_by_hop_init (vlib_main_t * vm)
2497 {
2498   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2499   memset (hm->options, 0, sizeof (hm->options));
2500   memset (hm->trace, 0, sizeof (hm->trace));
2501   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2502   return (0);
2503 }
2504
2505 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2506
2507 void
2508 ip6_hbh_set_next_override (uword next)
2509 {
2510   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2511
2512   hm->next_override = next;
2513 }
2514
2515 int
2516 ip6_hbh_register_option (u8 option,
2517                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2518                                       ip6_hop_by_hop_option_t * opt),
2519                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2520 {
2521   ip6_main_t *im = &ip6_main;
2522   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2523
2524   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2525
2526   /* Already registered */
2527   if (hm->options[option])
2528     return (-1);
2529
2530   hm->options[option] = options;
2531   hm->trace[option] = trace;
2532
2533   /* Set global variable */
2534   im->hbh_enabled = 1;
2535
2536   return (0);
2537 }
2538
2539 int
2540 ip6_hbh_unregister_option (u8 option)
2541 {
2542   ip6_main_t *im = &ip6_main;
2543   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2544
2545   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2546
2547   /* Not registered */
2548   if (!hm->options[option])
2549     return (-1);
2550
2551   hm->options[option] = NULL;
2552   hm->trace[option] = NULL;
2553
2554   /* Disable global knob if this was the last option configured */
2555   int i;
2556   bool found = false;
2557   for (i = 0; i < 256; i++)
2558     {
2559       if (hm->options[option])
2560         {
2561           found = true;
2562           break;
2563         }
2564     }
2565   if (!found)
2566     im->hbh_enabled = 0;
2567
2568   return (0);
2569 }
2570
2571 /* Global IP6 main. */
2572 ip6_main_t ip6_main;
2573
2574 static clib_error_t *
2575 ip6_lookup_init (vlib_main_t * vm)
2576 {
2577   ip6_main_t *im = &ip6_main;
2578   clib_error_t *error;
2579   uword i;
2580
2581   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2582     return error;
2583
2584   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2585     {
2586       u32 j, i0, i1;
2587
2588       i0 = i / 32;
2589       i1 = i % 32;
2590
2591       for (j = 0; j < i0; j++)
2592         im->fib_masks[i].as_u32[j] = ~0;
2593
2594       if (i1)
2595         im->fib_masks[i].as_u32[i0] =
2596           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2597     }
2598
2599   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2600
2601   if (im->lookup_table_nbuckets == 0)
2602     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2603
2604   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2605
2606   if (im->lookup_table_size == 0)
2607     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2608
2609   BV (clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2610                          "ip6 FIB fwding table",
2611                          im->lookup_table_nbuckets, im->lookup_table_size);
2612   BV (clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2613                          "ip6 FIB non-fwding table",
2614                          im->lookup_table_nbuckets, im->lookup_table_size);
2615
2616   /* Create FIB with index 0 and table id of 0. */
2617   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2618                                      FIB_SOURCE_DEFAULT_ROUTE);
2619   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2620                                       MFIB_SOURCE_DEFAULT_ROUTE);
2621
2622   {
2623     pg_node_t *pn;
2624     pn = pg_get_node (ip6_lookup_node.index);
2625     pn->unformat_edit = unformat_pg_ip6_header;
2626   }
2627
2628   /* Unless explicitly configured, don't process HBH options */
2629   im->hbh_enabled = 0;
2630
2631   {
2632     icmp6_neighbor_solicitation_header_t p;
2633
2634     memset (&p, 0, sizeof (p));
2635
2636     p.ip.ip_version_traffic_class_and_flow_label =
2637       clib_host_to_net_u32 (0x6 << 28);
2638     p.ip.payload_length =
2639       clib_host_to_net_u16 (sizeof (p) -
2640                             STRUCT_OFFSET_OF
2641                             (icmp6_neighbor_solicitation_header_t, neighbor));
2642     p.ip.protocol = IP_PROTOCOL_ICMP6;
2643     p.ip.hop_limit = 255;
2644     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2645
2646     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2647
2648     p.link_layer_option.header.type =
2649       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2650     p.link_layer_option.header.n_data_u64s =
2651       sizeof (p.link_layer_option) / sizeof (u64);
2652
2653     vlib_packet_template_init (vm,
2654                                &im->discover_neighbor_packet_template,
2655                                &p, sizeof (p),
2656                                /* alloc chunk size */ 8,
2657                                "ip6 neighbor discovery");
2658   }
2659
2660   return error;
2661 }
2662
2663 VLIB_INIT_FUNCTION (ip6_lookup_init);
2664
2665 void
2666 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip,
2667                                                   u8 * mac)
2668 {
2669   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2670   /* Invert the "u" bit */
2671   ip->as_u8[8] = mac[0] ^ (1 << 1);
2672   ip->as_u8[9] = mac[1];
2673   ip->as_u8[10] = mac[2];
2674   ip->as_u8[11] = 0xFF;
2675   ip->as_u8[12] = 0xFE;
2676   ip->as_u8[13] = mac[3];
2677   ip->as_u8[14] = mac[4];
2678   ip->as_u8[15] = mac[5];
2679 }
2680
2681 void
2682 ip6_ethernet_mac_address_from_link_local_address (u8 * mac,
2683                                                   ip6_address_t * ip)
2684 {
2685   /* Invert the previously inverted "u" bit */
2686   mac[0] = ip->as_u8[8] ^ (1 << 1);
2687   mac[1] = ip->as_u8[9];
2688   mac[2] = ip->as_u8[10];
2689   mac[3] = ip->as_u8[13];
2690   mac[4] = ip->as_u8[14];
2691   mac[5] = ip->as_u8[15];
2692 }
2693
2694 static clib_error_t *
2695 test_ip6_link_command_fn (vlib_main_t * vm,
2696                           unformat_input_t * input, vlib_cli_command_t * cmd)
2697 {
2698   u8 mac[6];
2699   ip6_address_t _a, *a = &_a;
2700
2701   if (unformat (input, "%U", unformat_ethernet_address, mac))
2702     {
2703       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2704       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2705       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2706       vlib_cli_output (vm, "Original MAC address: %U",
2707                        format_ethernet_address, mac);
2708     }
2709
2710   return 0;
2711 }
2712
2713 /*?
2714  * This command converts the given MAC Address into an IPv6 link-local
2715  * address.
2716  *
2717  * @cliexpar
2718  * Example of how to create an IPv6 link-local address:
2719  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2720  * Link local address: fe80::14d9:e0ff:fe91:7986
2721  * Original MAC address: 16:d9:e0:91:79:86
2722  * @cliexend
2723 ?*/
2724 /* *INDENT-OFF* */
2725 VLIB_CLI_COMMAND (test_link_command, static) =
2726 {
2727   .path = "test ip6 link",
2728   .function = test_ip6_link_command_fn,
2729   .short_help = "test ip6 link <mac-address>",
2730 };
2731 /* *INDENT-ON* */
2732
2733 int
2734 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2735 {
2736   u32 fib_index;
2737
2738   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2739
2740   if (~0 == fib_index)
2741     return VNET_API_ERROR_NO_SUCH_FIB;
2742
2743   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2744                                   flow_hash_config);
2745
2746   return 0;
2747 }
2748
2749 static clib_error_t *
2750 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2751                               unformat_input_t * input,
2752                               vlib_cli_command_t * cmd)
2753 {
2754   int matched = 0;
2755   u32 table_id = 0;
2756   u32 flow_hash_config = 0;
2757   int rv;
2758
2759   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2760     {
2761       if (unformat (input, "table %d", &table_id))
2762         matched = 1;
2763 #define _(a,v) \
2764     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2765       foreach_flow_hash_bit
2766 #undef _
2767         else
2768         break;
2769     }
2770
2771   if (matched == 0)
2772     return clib_error_return (0, "unknown input `%U'",
2773                               format_unformat_error, input);
2774
2775   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2776   switch (rv)
2777     {
2778     case 0:
2779       break;
2780
2781     case -1:
2782       return clib_error_return (0, "no such FIB table %d", table_id);
2783
2784     default:
2785       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2786       break;
2787     }
2788
2789   return 0;
2790 }
2791
2792 /*?
2793  * Configure the set of IPv6 fields used by the flow hash.
2794  *
2795  * @cliexpar
2796  * @parblock
2797  * Example of how to set the flow hash on a given table:
2798  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2799  *
2800  * Example of display the configured flow hash:
2801  * @cliexstart{show ip6 fib}
2802  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2803  * @::/0
2804  *   unicast-ip6-chain
2805  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2806  *     [0] [@0]: dpo-drop ip6
2807  * fe80::/10
2808  *   unicast-ip6-chain
2809  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2810  *     [0] [@2]: dpo-receive
2811  * ff02::1/128
2812  *   unicast-ip6-chain
2813  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2814  *     [0] [@2]: dpo-receive
2815  * ff02::2/128
2816  *   unicast-ip6-chain
2817  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2818  *     [0] [@2]: dpo-receive
2819  * ff02::16/128
2820  *   unicast-ip6-chain
2821  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2822  *     [0] [@2]: dpo-receive
2823  * ff02::1:ff00:0/104
2824  *   unicast-ip6-chain
2825  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2826  *     [0] [@2]: dpo-receive
2827  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2828  * @::/0
2829  *   unicast-ip6-chain
2830  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2831  *     [0] [@0]: dpo-drop ip6
2832  * @::a:1:1:0:4/126
2833  *   unicast-ip6-chain
2834  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2835  *     [0] [@4]: ipv6-glean: af_packet0
2836  * @::a:1:1:0:7/128
2837  *   unicast-ip6-chain
2838  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2839  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2840  * fe80::/10
2841  *   unicast-ip6-chain
2842  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2843  *     [0] [@2]: dpo-receive
2844  * fe80::fe:3eff:fe3e:9222/128
2845  *   unicast-ip6-chain
2846  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2847  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2848  * ff02::1/128
2849  *   unicast-ip6-chain
2850  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2851  *     [0] [@2]: dpo-receive
2852  * ff02::2/128
2853  *   unicast-ip6-chain
2854  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2855  *     [0] [@2]: dpo-receive
2856  * ff02::16/128
2857  *   unicast-ip6-chain
2858  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2859  *     [0] [@2]: dpo-receive
2860  * ff02::1:ff00:0/104
2861  *   unicast-ip6-chain
2862  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2863  *     [0] [@2]: dpo-receive
2864  * @cliexend
2865  * @endparblock
2866 ?*/
2867 /* *INDENT-OFF* */
2868 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2869 {
2870   .path = "set ip6 flow-hash",
2871   .short_help =
2872   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2873   .function = set_ip6_flow_hash_command_fn,
2874 };
2875 /* *INDENT-ON* */
2876
2877 static clib_error_t *
2878 show_ip6_local_command_fn (vlib_main_t * vm,
2879                            unformat_input_t * input, vlib_cli_command_t * cmd)
2880 {
2881   ip6_main_t *im = &ip6_main;
2882   ip_lookup_main_t *lm = &im->lookup_main;
2883   int i;
2884
2885   vlib_cli_output (vm, "Protocols handled by ip6_local");
2886   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2887     {
2888       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2889         {
2890
2891           u32 node_index = vlib_get_node (vm,
2892                                           ip6_local_node.index)->
2893             next_nodes[lm->local_next_by_ip_protocol[i]];
2894           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2895                            node_index);
2896         }
2897     }
2898   return 0;
2899 }
2900
2901
2902
2903 /*?
2904  * Display the set of protocols handled by the local IPv6 stack.
2905  *
2906  * @cliexpar
2907  * Example of how to display local protocol table:
2908  * @cliexstart{show ip6 local}
2909  * Protocols handled by ip6_local
2910  * 17
2911  * 43
2912  * 58
2913  * 115
2914  * @cliexend
2915 ?*/
2916 /* *INDENT-OFF* */
2917 VLIB_CLI_COMMAND (show_ip6_local, static) =
2918 {
2919   .path = "show ip6 local",
2920   .function = show_ip6_local_command_fn,
2921   .short_help = "show ip6 local",
2922 };
2923 /* *INDENT-ON* */
2924
2925 int
2926 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2927                              u32 table_index)
2928 {
2929   vnet_main_t *vnm = vnet_get_main ();
2930   vnet_interface_main_t *im = &vnm->interface_main;
2931   ip6_main_t *ipm = &ip6_main;
2932   ip_lookup_main_t *lm = &ipm->lookup_main;
2933   vnet_classify_main_t *cm = &vnet_classify_main;
2934   ip6_address_t *if_addr;
2935
2936   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2937     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2938
2939   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2940     return VNET_API_ERROR_NO_SUCH_ENTRY;
2941
2942   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2943   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2944
2945   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2946
2947   if (NULL != if_addr)
2948     {
2949       fib_prefix_t pfx = {
2950         .fp_len = 128,
2951         .fp_proto = FIB_PROTOCOL_IP6,
2952         .fp_addr.ip6 = *if_addr,
2953       };
2954       u32 fib_index;
2955
2956       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2957                                                        sw_if_index);
2958
2959
2960       if (table_index != (u32) ~ 0)
2961         {
2962           dpo_id_t dpo = DPO_INVALID;
2963
2964           dpo_set (&dpo,
2965                    DPO_CLASSIFY,
2966                    DPO_PROTO_IP6,
2967                    classify_dpo_create (DPO_PROTO_IP6, table_index));
2968
2969           fib_table_entry_special_dpo_add (fib_index,
2970                                            &pfx,
2971                                            FIB_SOURCE_CLASSIFY,
2972                                            FIB_ENTRY_FLAG_NONE, &dpo);
2973           dpo_reset (&dpo);
2974         }
2975       else
2976         {
2977           fib_table_entry_special_remove (fib_index,
2978                                           &pfx, FIB_SOURCE_CLASSIFY);
2979         }
2980     }
2981
2982   return 0;
2983 }
2984
2985 static clib_error_t *
2986 set_ip6_classify_command_fn (vlib_main_t * vm,
2987                              unformat_input_t * input,
2988                              vlib_cli_command_t * cmd)
2989 {
2990   u32 table_index = ~0;
2991   int table_index_set = 0;
2992   u32 sw_if_index = ~0;
2993   int rv;
2994
2995   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2996     {
2997       if (unformat (input, "table-index %d", &table_index))
2998         table_index_set = 1;
2999       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3000                          vnet_get_main (), &sw_if_index))
3001         ;
3002       else
3003         break;
3004     }
3005
3006   if (table_index_set == 0)
3007     return clib_error_return (0, "classify table-index must be specified");
3008
3009   if (sw_if_index == ~0)
3010     return clib_error_return (0, "interface / subif must be specified");
3011
3012   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3013
3014   switch (rv)
3015     {
3016     case 0:
3017       break;
3018
3019     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3020       return clib_error_return (0, "No such interface");
3021
3022     case VNET_API_ERROR_NO_SUCH_ENTRY:
3023       return clib_error_return (0, "No such classifier table");
3024     }
3025   return 0;
3026 }
3027
3028 /*?
3029  * Assign a classification table to an interface. The classification
3030  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3031  * commands. Once the table is create, use this command to filter packets
3032  * on an interface.
3033  *
3034  * @cliexpar
3035  * Example of how to assign a classification table to an interface:
3036  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3037 ?*/
3038 /* *INDENT-OFF* */
3039 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3040 {
3041   .path = "set ip6 classify",
3042   .short_help =
3043   "set ip6 classify intfc <interface> table-index <classify-idx>",
3044   .function = set_ip6_classify_command_fn,
3045 };
3046 /* *INDENT-ON* */
3047
3048 static clib_error_t *
3049 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3050 {
3051   ip6_main_t *im = &ip6_main;
3052   uword heapsize = 0;
3053   u32 tmp;
3054   u32 nbuckets = 0;
3055
3056   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3057     {
3058       if (unformat (input, "hash-buckets %d", &tmp))
3059         nbuckets = tmp;
3060       else if (unformat (input, "heap-size %U",
3061                          unformat_memory_size, &heapsize))
3062         ;
3063       else
3064         return clib_error_return (0, "unknown input '%U'",
3065                                   format_unformat_error, input);
3066     }
3067
3068   im->lookup_table_nbuckets = nbuckets;
3069   im->lookup_table_size = heapsize;
3070
3071   return 0;
3072 }
3073
3074 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3075
3076 /*
3077  * fd.io coding-style-patch-verification: ON
3078  *
3079  * Local Variables:
3080  * eval: (c-set-style "gnu")
3081  * End:
3082  */