vnet/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/ethernet/ethernet.h> /* for ethernet_header_t */
  43 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  44 #include <vppinfra/cache.h>
  45 #include <vnet/fib/fib_table.h>
  46 #include <vnet/fib/ip6_fib.h>
  47 #include <vnet/dpo/load_balance.h>
  48 #include <vnet/dpo/classify_dpo.h>
  49
  50 #include <vppinfra/bihash_template.c>
  51
  52 /**
  53  * @file
  54  * @brief IPv6 Forwarding.
  55  *
  56  * This file contains the source code for IPv6 forwarding.
  57  */
  58
  59 void
  60 ip6_forward_next_trace (vlib_main_t * vm,
  61                         vlib_node_runtime_t * node,
  62                         vlib_frame_t * frame,
  63                         vlib_rx_or_tx_t which_adj_index);
  64
  65 always_inline uword
  66 ip6_lookup_inline (vlib_main_t * vm,
  67                    vlib_node_runtime_t * node,
  68                    vlib_frame_t * frame)
  69 {
  70   ip6_main_t * im = &ip6_main;
  71   vlib_combined_counter_main_t * cm = &load_balance_main.lbm_to_counters;
  72   u32 n_left_from, n_left_to_next, * from, * to_next;
  73   ip_lookup_next_t next;
  74   u32 cpu_index = os_get_cpu_number();
  75
  76   from = vlib_frame_vector_args (frame);
  77   n_left_from = frame->n_vectors;
  78   next = node->cached_next_index;
  79
  80   while (n_left_from > 0)
  81     {
  82       vlib_get_next_frame (vm, node, next,
  83                            to_next, n_left_to_next);
  84
  85       while (n_left_from >= 4 && n_left_to_next >= 2)
  86         {
  87           vlib_buffer_t * p0, * p1;
  88           u32 pi0, pi1, lbi0, lbi1, wrong_next;
  89           ip_lookup_next_t next0, next1;
  90           ip6_header_t * ip0, * ip1;
  91           ip6_address_t * dst_addr0, * dst_addr1;
  92           u32 fib_index0, fib_index1;
  93           u32 flow_hash_config0, flow_hash_config1;
  94           const dpo_id_t *dpo0, *dpo1;
  95           const load_balance_t *lb0, *lb1;
  96
  97           /* Prefetch next iteration. */
  98           {
  99             vlib_buffer_t * p2, * p3;
 100
 101             p2 = vlib_get_buffer (vm, from[2]);
 102             p3 = vlib_get_buffer (vm, from[3]);
 103
 104             vlib_prefetch_buffer_header (p2, LOAD);
 105             vlib_prefetch_buffer_header (p3, LOAD);
 106             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
 107             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
 108           }
 109
 110           pi0 = to_next[0] = from[0];
 111           pi1 = to_next[1] = from[1];
 112
 113           p0 = vlib_get_buffer (vm, pi0);
 114           p1 = vlib_get_buffer (vm, pi1);
 115
 116           ip0 = vlib_buffer_get_current (p0);
 117           ip1 = vlib_buffer_get_current (p1);
 118
 119           dst_addr0 = &ip0->dst_address;
 120           dst_addr1 = &ip1->dst_address;
 121
 122           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 123           fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
 124
 125           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 126             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 127           fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
 128             fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
 129
 130           lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
 131           lbi1 = ip6_fib_table_fwding_lookup (im, fib_index1, dst_addr1);
 132
 133           lb0 = load_balance_get (lbi0);
 134           lb1 = load_balance_get (lbi1);
 135
 136           vnet_buffer (p0)->ip.flow_hash =
 137             vnet_buffer(p1)->ip.flow_hash = 0;
 138
 139           if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
 140             {
 141               flow_hash_config0 = lb0->lb_hash_config;
 142               vnet_buffer (p0)->ip.flow_hash =
 143                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 144             }
 145           if (PREDICT_FALSE(lb1->lb_n_buckets > 1))
 146             {
 147               flow_hash_config1 = lb1->lb_hash_config;
 148               vnet_buffer (p1)->ip.flow_hash =
 149                 ip6_compute_flow_hash (ip1, flow_hash_config1);
 150             }
 151
 152           ASSERT (lb0->lb_n_buckets > 0);
 153           ASSERT (lb1->lb_n_buckets > 0);
 154           ASSERT (is_pow2 (lb0->lb_n_buckets));
 155           ASSERT (is_pow2 (lb1->lb_n_buckets));
 156           dpo0 = load_balance_get_bucket_i(lb0,
 157                                            (vnet_buffer (p0)->ip.flow_hash &
 158                                             lb0->lb_n_buckets_minus_1));
 159           dpo1 = load_balance_get_bucket_i(lb1,
 160                                            (vnet_buffer (p1)->ip.flow_hash &
 161                                             lb1->lb_n_buckets_minus_1));
 162
 163           next0 = dpo0->dpoi_next_node;
 164           next1 = dpo1->dpoi_next_node;
 165
 166           /* Only process the HBH Option Header if explicitly configured to do so */
 167           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 168             {
 169               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 170                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 171             }
 172           if (PREDICT_FALSE(ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 173             {
 174               next1 = (dpo_is_adj(dpo1) && im->hbh_enabled) ?
 175                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 176             }
 177           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 178           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 179
 180           vlib_increment_combined_counter
 181               (cm, cpu_index, lbi0, 1,
 182                vlib_buffer_length_in_chain (vm, p0));
 183           vlib_increment_combined_counter
 184               (cm, cpu_index, lbi1, 1,
 185                vlib_buffer_length_in_chain (vm, p1));
 186
 187           from += 2;
 188           to_next += 2;
 189           n_left_to_next -= 2;
 190           n_left_from -= 2;
 191
 192           wrong_next = (next0 != next) + 2*(next1 != next);
 193           if (PREDICT_FALSE (wrong_next != 0))
 194             {
 195               switch (wrong_next)
 196                 {
 197                 case 1:
 198                   /* A B A */
 199                   to_next[-2] = pi1;
 200                   to_next -= 1;
 201                   n_left_to_next += 1;
 202                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 203                   break;
 204
 205                 case 2:
 206                   /* A A B */
 207                   to_next -= 1;
 208                   n_left_to_next += 1;
 209                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 210                   break;
 211
 212                 case 3:
 213                   /* A B C */
 214                   to_next -= 2;
 215                   n_left_to_next += 2;
 216                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 217                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 218                   if (next0 == next1)
 219                     {
 220                       /* A B B */
 221                       vlib_put_next_frame (vm, node, next, n_left_to_next);
 222                       next = next1;
 223                       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 224                     }
 225                 }
 226             }
 227         }
 228
 229       while (n_left_from > 0 && n_left_to_next > 0)
 230         {
 231           vlib_buffer_t * p0;
 232           ip6_header_t * ip0;
 233           u32 pi0, lbi0;
 234           ip_lookup_next_t next0;
 235           load_balance_t * lb0;
 236           ip6_address_t * dst_addr0;
 237           u32 fib_index0, flow_hash_config0;
 238           const dpo_id_t *dpo0;
 239
 240           pi0 = from[0];
 241           to_next[0] = pi0;
 242
 243           p0 = vlib_get_buffer (vm, pi0);
 244
 245           ip0 = vlib_buffer_get_current (p0);
 246
 247           dst_addr0 = &ip0->dst_address;
 248
 249           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 250           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 251             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 252
 253           flow_hash_config0 =
 254               ip6_fib_get (fib_index0)->flow_hash_config;
 255
 256           lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
 257
 258           lb0 = load_balance_get (lbi0);
 259
 260           vnet_buffer (p0)->ip.flow_hash = 0;
 261
 262           if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
 263             {
 264               flow_hash_config0 = lb0->lb_hash_config;
 265               vnet_buffer (p0)->ip.flow_hash =
 266                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 267             }
 268
 269           ASSERT (lb0->lb_n_buckets > 0);
 270           ASSERT (is_pow2 (lb0->lb_n_buckets));
 271           dpo0 = load_balance_get_bucket_i(lb0,
 272                                            (vnet_buffer (p0)->ip.flow_hash &
 273                                             lb0->lb_n_buckets_minus_1));
 274           next0 = dpo0->dpoi_next_node;
 275
 276           /* Only process the HBH Option Header if explicitly configured to do so */
 277           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 278             {
 279               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 280                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 281             }
 282           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 283
 284           vlib_increment_combined_counter
 285               (cm, cpu_index, lbi0, 1,
 286                vlib_buffer_length_in_chain (vm, p0));
 287
 288           from += 1;
 289           to_next += 1;
 290           n_left_to_next -= 1;
 291           n_left_from -= 1;
 292
 293           if (PREDICT_FALSE (next0 != next))
 294             {
 295               n_left_to_next += 1;
 296               vlib_put_next_frame (vm, node, next, n_left_to_next);
 297               next = next0;
 298               vlib_get_next_frame (vm, node, next,
 299                                    to_next, n_left_to_next);
 300               to_next[0] = pi0;
 301               to_next += 1;
 302               n_left_to_next -= 1;
 303             }
 304         }
 305
 306       vlib_put_next_frame (vm, node, next, n_left_to_next);
 307     }
 308
 309   if (node->flags & VLIB_NODE_FLAG_TRACE)
 310     ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 311
 312   return frame->n_vectors;
 313 }
 314
 315 static void
 316 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 317                           ip6_main_t * im, u32 fib_index,
 318                           ip_interface_address_t * a)
 319 {
 320   ip_lookup_main_t * lm = &im->lookup_main;
 321   ip6_address_t * address = ip_interface_address_get_address (lm, a);
 322   fib_prefix_t pfx = {
 323       .fp_len = a->address_length,
 324       .fp_proto = FIB_PROTOCOL_IP6,
 325       .fp_addr.ip6 = *address,
 326   };
 327
 328   a->neighbor_probe_adj_index = ~0;
 329   if (a->address_length < 128)
 330   {
 331       fib_node_index_t fei;
 332
 333       fei = fib_table_entry_update_one_path(fib_index,
 334                                             &pfx,
 335                                             FIB_SOURCE_INTERFACE,
 336                                             (FIB_ENTRY_FLAG_CONNECTED |
 337                                              FIB_ENTRY_FLAG_ATTACHED),
 338                                             FIB_PROTOCOL_IP6,
 339                                             NULL, /* No next-hop address */
 340                                             sw_if_index,
 341                                             ~0, // invalid FIB index
 342                                             1,
 343                                             MPLS_LABEL_INVALID,
 344                                             FIB_ROUTE_PATH_FLAG_NONE);
 345       a->neighbor_probe_adj_index = fib_entry_get_adj(fei);
 346   }
 347
 348   pfx.fp_len = 128;
 349   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 350   {
 351       u32 classify_table_index =
 352           lm->classify_table_index_by_sw_if_index [sw_if_index];
 353       if (classify_table_index != (u32) ~0)
 354       {
 355           dpo_id_t dpo = DPO_INVALID;
 356
 357           dpo_set(&dpo,
 358                   DPO_CLASSIFY,
 359                   DPO_PROTO_IP6,
 360                   classify_dpo_create(DPO_PROTO_IP6, classify_table_index));
 361
 362           fib_table_entry_special_dpo_add(fib_index,
 363                                           &pfx,
 364                                           FIB_SOURCE_CLASSIFY,
 365                                           FIB_ENTRY_FLAG_NONE,
 366                                           &dpo);
 367           dpo_reset(&dpo);
 368       }
 369   }
 370
 371   fib_table_entry_update_one_path(fib_index,
 372                                   &pfx,
 373                                   FIB_SOURCE_INTERFACE,
 374                                   (FIB_ENTRY_FLAG_CONNECTED |
 375                                    FIB_ENTRY_FLAG_LOCAL),
 376                                   FIB_PROTOCOL_IP6,
 377                                   &pfx.fp_addr,
 378                                   sw_if_index,
 379                                   ~0, // invalid FIB index
 380                                   1,
 381                                   MPLS_LABEL_INVALID,
 382                                   FIB_ROUTE_PATH_FLAG_NONE);
 383 }
 384
 385 static void
 386 ip6_del_interface_routes (ip6_main_t * im,
 387                           u32 fib_index,
 388                           ip6_address_t * address,
 389                           u32 address_length)
 390 {
 391     fib_prefix_t pfx = {
 392         .fp_len = address_length,
 393         .fp_proto = FIB_PROTOCOL_IP6,
 394         .fp_addr.ip6 = *address,
 395     };
 396
 397     if (pfx.fp_len < 128)
 398     {
 399         fib_table_entry_delete(fib_index,
 400                                &pfx,
 401                                FIB_SOURCE_INTERFACE);
 402
 403     }
 404
 405     pfx.fp_len = 128;
 406     fib_table_entry_delete(fib_index,
 407                            &pfx,
 408                            FIB_SOURCE_INTERFACE);
 409 }
 410
 411 void
 412 ip6_sw_interface_enable_disable (u32 sw_if_index,
 413                                  u32 is_enable)
 414 {
 415   ip6_main_t * im = &ip6_main;
 416
 417   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 418
 419   /*
 420    * enable/disable only on the 1<->0 transition
 421    */
 422   if (is_enable)
 423     {
 424       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 425         return;
 426     }
 427   else
 428     {
 429       ASSERT(im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
 430       if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 431         return;
 432     }
 433
 434   vnet_feature_enable_disable ("ip6-unicast", "ip6-lookup", sw_if_index,
 435                                is_enable, 0, 0);
 436
 437   vnet_feature_enable_disable ("ip6-multicast", "ip6-lookup", sw_if_index,
 438                                is_enable, 0, 0);
 439
 440 }
 441
 442 /* get first interface address */
 443 ip6_address_t *
 444 ip6_interface_first_address (ip6_main_t * im,
 445                              u32 sw_if_index,
 446                              ip_interface_address_t ** result_ia)
 447 {
 448   ip_lookup_main_t * lm = &im->lookup_main;
 449   ip_interface_address_t * ia = 0;
 450   ip6_address_t * result = 0;
 451
 452   foreach_ip_interface_address (lm, ia, sw_if_index,
 453                                 1 /* honor unnumbered */,
 454   ({
 455     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 456     result = a;
 457     break;
 458   }));
 459   if (result_ia)
 460     *result_ia = result ? ia : 0;
 461   return result;
 462 }
 463
 464 clib_error_t *
 465 ip6_add_del_interface_address (vlib_main_t * vm,
 466                                u32 sw_if_index,
 467                                ip6_address_t * address,
 468                                u32 address_length,
 469                                u32 is_del)
 470 {
 471   vnet_main_t * vnm = vnet_get_main();
 472   ip6_main_t * im = &ip6_main;
 473   ip_lookup_main_t * lm = &im->lookup_main;
 474   clib_error_t * error;
 475   u32 if_address_index;
 476   ip6_address_fib_t ip6_af, * addr_fib = 0;
 477
 478   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 479   ip6_addr_fib_init (&ip6_af, address,
 480                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 481   vec_add1 (addr_fib, ip6_af);
 482
 483   {
 484     uword elts_before = pool_elts (lm->if_address_pool);
 485
 486     error = ip_interface_address_add_del
 487       (lm,
 488        sw_if_index,
 489        addr_fib,
 490        address_length,
 491        is_del,
 492        &if_address_index);
 493     if (error)
 494       goto done;
 495
 496     /* Pool did not grow: add duplicate address. */
 497     if (elts_before == pool_elts (lm->if_address_pool))
 498       goto done;
 499   }
 500
 501   if (is_del)
 502       ip6_del_interface_routes (im, ip6_af.fib_index, address,
 503                                 address_length);
 504   else
 505       ip6_add_interface_routes (vnm, sw_if_index,
 506                                 im, ip6_af.fib_index,
 507                                 pool_elt_at_index (lm->if_address_pool, if_address_index));
 508
 509   {
 510     ip6_add_del_interface_address_callback_t * cb;
 511     vec_foreach (cb, im->add_del_interface_address_callbacks)
 512       cb->function (im, cb->function_opaque, sw_if_index,
 513                     address, address_length,
 514                     if_address_index,
 515                     is_del);
 516   }
 517
 518  done:
 519   vec_free (addr_fib);
 520   return error;
 521 }
 522
 523 clib_error_t *
 524 ip6_sw_interface_admin_up_down (vnet_main_t * vnm,
 525                                 u32 sw_if_index,
 526                                 u32 flags)
 527 {
 528   ip6_main_t * im = &ip6_main;
 529   ip_interface_address_t * ia;
 530   ip6_address_t * a;
 531   u32 is_admin_up, fib_index;
 532
 533   /* Fill in lookup tables with default table (0). */
 534   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 535
 536   vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
 537
 538   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 539
 540   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 541
 542   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 543                                 0 /* honor unnumbered */,
 544   ({
 545     a = ip_interface_address_get_address (&im->lookup_main, ia);
 546     if (is_admin_up)
 547       ip6_add_interface_routes (vnm, sw_if_index,
 548                                 im, fib_index,
 549                                 ia);
 550     else
 551       ip6_del_interface_routes (im, fib_index,
 552                                 a, ia->address_length);
 553   }));
 554
 555   return 0;
 556 }
 557
 558 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 559
 560 /* Built-in ip6 unicast rx feature path definition */
 561 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 562 {
 563   .arc_name  = "ip6-unicast",
 564   .start_nodes = VNET_FEATURES ("ip6-input"),
 565   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 566 };
 567
 568 VNET_FEATURE_INIT (ip6_flow_classify, static) = {
 569   .arc_name = "ip6-unicast",
 570   .node_name = "ip6-flow-classify",
 571   .runs_before = VNET_FEATURES ("ip6-inacl"),
 572 };
 573
 574 VNET_FEATURE_INIT (ip6_inacl, static) = {
 575   .arc_name = "ip6-unicast",
 576   .node_name = "ip6-inacl",
 577   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 578 };
 579
 580 VNET_FEATURE_INIT (ip6_policer_classify, static) = {
 581   .arc_name = "ip6-unicast",
 582   .node_name = "ip6-policer-classify",
 583   .runs_before = VNET_FEATURES ("ipsec-input-ip6"),
 584 };
 585
 586 VNET_FEATURE_INIT (ip6_ipsec, static) = {
 587   .arc_name = "ip6-unicast",
 588   .node_name = "ipsec-input-ip6",
 589   .runs_before = VNET_FEATURES ("l2tp-decap"),
 590 };
 591
 592 VNET_FEATURE_INIT (ip6_l2tp, static) = {
 593   .arc_name = "ip6-unicast",
 594   .node_name = "l2tp-decap",
 595   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 596 };
 597
 598 VNET_FEATURE_INIT (ip6_vpath, static) = {
 599   .arc_name = "ip6-unicast",
 600   .node_name = "vpath-input-ip6",
 601   .runs_before = VNET_FEATURES ("ip6-lookup"),
 602 };
 603
 604 VNET_FEATURE_INIT (ip6_lookup, static) = {
 605   .arc_name = "ip6-unicast",
 606   .node_name = "ip6-lookup",
 607   .runs_before = VNET_FEATURES ("ip6-drop"),
 608 };
 609
 610 VNET_FEATURE_INIT (ip6_drop, static) = {
 611   .arc_name = "ip6-unicast",
 612   .node_name = "ip6-drop",
 613   .runs_before = 0,  /*last feature*/
 614 };
 615
 616 /* Built-in ip6 multicast rx feature path definition (none now) */
 617 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 618 {
 619   .arc_name  = "ip6-multicast",
 620   .start_nodes = VNET_FEATURES ("ip6-input"),
 621   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 622 };
 623
 624 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 625   .arc_name = "ip6-multicast",
 626   .node_name = "vpath-input-ip6",
 627   .runs_before = VNET_FEATURES ("ip6-lookup"),
 628 };
 629
 630 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 631   .arc_name = "ip6-multicast",
 632   .node_name = "ip6-lookup",
 633   .runs_before = VNET_FEATURES ("ip6-drop"),
 634 };
 635
 636 VNET_FEATURE_INIT (ip6_drop_mc, static) = {
 637   .arc_name = "ip6-multicast",
 638   .node_name = "ip6-drop",
 639   .runs_before = 0, /* last feature */
 640 };
 641
 642 /* Built-in ip4 tx feature path definition */
 643 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 644 {
 645   .arc_name  = "ip6-output",
 646   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain"),
 647   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 648 };
 649
 650 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 651   .arc_name = "ip6-output",
 652   .node_name = "interface-output",
 653   .runs_before = 0, /* not before any other features */
 654 };
 655
 656 clib_error_t *
 657 ip6_sw_interface_add_del (vnet_main_t * vnm,
 658                           u32 sw_if_index,
 659                           u32 is_add)
 660 {
 661   vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index,
 662                                is_add, 0, 0);
 663
 664   vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index,
 665                                is_add, 0, 0);
 666
 667   vnet_feature_enable_disable ("ip6-output", "interface-output", sw_if_index,
 668                                is_add, 0, 0);
 669
 670   return /* no error */ 0;
 671 }
 672
 673 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 674
 675 static uword
 676 ip6_lookup (vlib_main_t * vm,
 677             vlib_node_runtime_t * node,
 678             vlib_frame_t * frame)
 679 {
 680   return ip6_lookup_inline (vm, node, frame);
 681 }
 682
 683 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args);
 684
 685 VLIB_REGISTER_NODE (ip6_lookup_node) = {
 686   .function = ip6_lookup,
 687   .name = "ip6-lookup",
 688   .vector_size = sizeof (u32),
 689
 690   .format_trace = format_ip6_lookup_trace,
 691
 692   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 693   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 694 };
 695
 696 VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup)
 697
 698 always_inline uword
 699 ip6_load_balance (vlib_main_t * vm,
 700                   vlib_node_runtime_t * node,
 701                   vlib_frame_t * frame)
 702 {
 703   vlib_combined_counter_main_t * cm = &load_balance_main.lbm_via_counters;
 704   u32 n_left_from, n_left_to_next, * from, * to_next;
 705   ip_lookup_next_t next;
 706   u32 cpu_index = os_get_cpu_number();
 707   ip6_main_t * im = &ip6_main;
 708
 709   from = vlib_frame_vector_args (frame);
 710   n_left_from = frame->n_vectors;
 711   next = node->cached_next_index;
 712
 713   if (node->flags & VLIB_NODE_FLAG_TRACE)
 714       ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 715
 716   while (n_left_from > 0)
 717     {
 718       vlib_get_next_frame (vm, node, next,
 719                            to_next, n_left_to_next);
 720
 721
 722       while (n_left_from > 0 && n_left_to_next > 0)
 723         {
 724           ip_lookup_next_t next0;
 725           const load_balance_t *lb0;
 726           vlib_buffer_t * p0;
 727           u32 pi0, lbi0, hc0;
 728           const ip6_header_t *ip0;
 729           const dpo_id_t *dpo0;
 730
 731           pi0 = from[0];
 732           to_next[0] = pi0;
 733
 734           p0 = vlib_get_buffer (vm, pi0);
 735
 736           ip0 = vlib_buffer_get_current (p0);
 737           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 738
 739           lb0 = load_balance_get(lbi0);
 740           hc0 = lb0->lb_hash_config;
 741           vnet_buffer(p0)->ip.flow_hash = ip6_compute_flow_hash(ip0, hc0);
 742
 743           dpo0 = load_balance_get_bucket_i(lb0,
 744                                            vnet_buffer(p0)->ip.flow_hash &
 745                                            (lb0->lb_n_buckets - 1));
 746           next0 = dpo0->dpoi_next_node;
 747           /* Only process the HBH Option Header if explicitly configured to do so */
 748           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 749             {
 750               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 751                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 752             }
 753           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 754
 755           vlib_increment_combined_counter
 756               (cm, cpu_index, lbi0, 1,
 757                vlib_buffer_length_in_chain (vm, p0));
 758
 759           from += 1;
 760           to_next += 1;
 761           n_left_to_next -= 1;
 762           n_left_from -= 1;
 763
 764           if (PREDICT_FALSE (next0 != next))
 765             {
 766               n_left_to_next += 1;
 767               vlib_put_next_frame (vm, node, next, n_left_to_next);
 768               next = next0;
 769               vlib_get_next_frame (vm, node, next,
 770                                    to_next, n_left_to_next);
 771               to_next[0] = pi0;
 772               to_next += 1;
 773               n_left_to_next -= 1;
 774             }
 775         }
 776
 777       vlib_put_next_frame (vm, node, next, n_left_to_next);
 778     }
 779
 780   return frame->n_vectors;
 781 }
 782
 783 VLIB_REGISTER_NODE (ip6_load_balance_node) = {
 784   .function = ip6_load_balance,
 785   .name = "ip6-load-balance",
 786   .vector_size = sizeof (u32),
 787   .sibling_of = "ip6-lookup",
 788   .format_trace = format_ip6_lookup_trace,
 789   .n_next_nodes = 0,
 790 };
 791
 792 VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance)
 793
 794 typedef struct {
 795   /* Adjacency taken. */
 796   u32 adj_index;
 797   u32 flow_hash;
 798   u32 fib_index;
 799
 800   /* Packet data, possibly *after* rewrite. */
 801   u8 packet_data[128 - 1*sizeof(u32)];
 802 } ip6_forward_next_trace_t;
 803
 804 static u8 * format_ip6_forward_next_trace (u8 * s, va_list * args)
 805 {
 806   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 807   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 808   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 809   uword indent = format_get_indent (s);
 810
 811   s = format(s, "%U%U",
 812              format_white_space, indent,
 813              format_ip6_header, t->packet_data, sizeof (t->packet_data));
 814   return s;
 815 }
 816
 817 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args)
 818 {
 819   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 820   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 821   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 822   uword indent = format_get_indent (s);
 823
 824   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 825               t->fib_index, t->adj_index, t->flow_hash);
 826   s = format(s, "\n%U%U",
 827              format_white_space, indent,
 828              format_ip6_header, t->packet_data, sizeof (t->packet_data));
 829   return s;
 830 }
 831
 832
 833 static u8 * format_ip6_rewrite_trace (u8 * s, va_list * args)
 834 {
 835   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 836   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 837   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 838   vnet_main_t * vnm = vnet_get_main();
 839   uword indent = format_get_indent (s);
 840
 841   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 842               t->fib_index, t->adj_index, format_ip_adjacency,
 843               t->adj_index, FORMAT_IP_ADJACENCY_NONE,
 844               t->flow_hash);
 845   s = format (s, "\n%U%U",
 846               format_white_space, indent,
 847               format_ip_adjacency_packet_data,
 848               vnm, t->adj_index,
 849               t->packet_data, sizeof (t->packet_data));
 850   return s;
 851 }
 852
 853 /* Common trace function for all ip6-forward next nodes. */
 854 void
 855 ip6_forward_next_trace (vlib_main_t * vm,
 856                         vlib_node_runtime_t * node,
 857                         vlib_frame_t * frame,
 858                         vlib_rx_or_tx_t which_adj_index)
 859 {
 860   u32 * from, n_left;
 861   ip6_main_t * im = &ip6_main;
 862
 863   n_left = frame->n_vectors;
 864   from = vlib_frame_vector_args (frame);
 865
 866   while (n_left >= 4)
 867     {
 868       u32 bi0, bi1;
 869       vlib_buffer_t * b0, * b1;
 870       ip6_forward_next_trace_t * t0, * t1;
 871
 872       /* Prefetch next iteration. */
 873       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 874       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 875
 876       bi0 = from[0];
 877       bi1 = from[1];
 878
 879       b0 = vlib_get_buffer (vm, bi0);
 880       b1 = vlib_get_buffer (vm, bi1);
 881
 882       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 883         {
 884           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 885           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 886           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 887           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
 888               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
 889               vec_elt (im->fib_index_by_sw_if_index,
 890                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 891
 892           clib_memcpy (t0->packet_data,
 893                   vlib_buffer_get_current (b0),
 894                   sizeof (t0->packet_data));
 895         }
 896       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 897         {
 898           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 899           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 900           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 901           t1->fib_index = (vnet_buffer(b1)->sw_if_index[VLIB_TX] != (u32)~0) ?
 902               vnet_buffer(b1)->sw_if_index[VLIB_TX] :
 903               vec_elt (im->fib_index_by_sw_if_index,
 904                        vnet_buffer(b1)->sw_if_index[VLIB_RX]);
 905
 906           clib_memcpy (t1->packet_data,
 907                   vlib_buffer_get_current (b1),
 908                   sizeof (t1->packet_data));
 909         }
 910       from += 2;
 911       n_left -= 2;
 912     }
 913
 914   while (n_left >= 1)
 915     {
 916       u32 bi0;
 917       vlib_buffer_t * b0;
 918       ip6_forward_next_trace_t * t0;
 919
 920       bi0 = from[0];
 921
 922       b0 = vlib_get_buffer (vm, bi0);
 923
 924       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 925         {
 926           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 927           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 928           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 929           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
 930               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
 931               vec_elt (im->fib_index_by_sw_if_index,
 932                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 933
 934           clib_memcpy (t0->packet_data,
 935                   vlib_buffer_get_current (b0),
 936                   sizeof (t0->packet_data));
 937         }
 938       from += 1;
 939       n_left -= 1;
 940     }
 941 }
 942
 943 static uword
 944 ip6_drop_or_punt (vlib_main_t * vm,
 945                   vlib_node_runtime_t * node,
 946                   vlib_frame_t * frame,
 947                   ip6_error_t error_code)
 948 {
 949   u32 * buffers = vlib_frame_vector_args (frame);
 950   uword n_packets = frame->n_vectors;
 951
 952   vlib_error_drop_buffers (vm, node,
 953                            buffers,
 954                            /* stride */ 1,
 955                            n_packets,
 956                            /* next */ 0,
 957                            ip6_input_node.index,
 958                            error_code);
 959
 960   if (node->flags & VLIB_NODE_FLAG_TRACE)
 961     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 962
 963   return n_packets;
 964 }
 965
 966 static uword
 967 ip6_drop (vlib_main_t * vm,
 968           vlib_node_runtime_t * node,
 969           vlib_frame_t * frame)
 970 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_DROP); }
 971
 972 static uword
 973 ip6_punt (vlib_main_t * vm,
 974           vlib_node_runtime_t * node,
 975           vlib_frame_t * frame)
 976 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_PUNT); }
 977
 978 VLIB_REGISTER_NODE (ip6_drop_node,static) = {
 979   .function = ip6_drop,
 980   .name = "ip6-drop",
 981   .vector_size = sizeof (u32),
 982
 983   .format_trace = format_ip6_forward_next_trace,
 984
 985   .n_next_nodes = 1,
 986   .next_nodes = {
 987     [0] = "error-drop",
 988   },
 989 };
 990
 991 VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop)
 992
 993 VLIB_REGISTER_NODE (ip6_punt_node,static) = {
 994   .function = ip6_punt,
 995   .name = "ip6-punt",
 996   .vector_size = sizeof (u32),
 997
 998   .format_trace = format_ip6_forward_next_trace,
 999
1000   .n_next_nodes = 1,
1001   .next_nodes = {
1002     [0] = "error-punt",
1003   },
1004 };
1005
1006 VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt)
1007
1008 VLIB_REGISTER_NODE (ip6_multicast_node,static) = {
1009   .function = ip6_drop,
1010   .name = "ip6-multicast",
1011   .vector_size = sizeof (u32),
1012
1013   .format_trace = format_ip6_forward_next_trace,
1014
1015   .n_next_nodes = 1,
1016   .next_nodes = {
1017     [0] = "error-drop",
1018   },
1019 };
1020
1021 /* Compute TCP/UDP/ICMP6 checksum in software. */
1022 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp)
1023 {
1024   ip_csum_t sum0;
1025   u16 sum16, payload_length_host_byte_order;
1026   u32 i, n_this_buffer, n_bytes_left;
1027   u32 headers_size = sizeof(ip0[0]);
1028   void * data_this_buffer;
1029
1030   ASSERT(bogus_lengthp);
1031   *bogus_lengthp = 0;
1032
1033   /* Initialize checksum with ip header. */
1034   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1035   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1036   data_this_buffer = (void *) (ip0 + 1);
1037
1038   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1039     {
1040       sum0 = ip_csum_with_carry (sum0,
1041                                  clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1042       sum0 = ip_csum_with_carry (sum0,
1043                                  clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1044     }
1045
1046   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1047   if (PREDICT_FALSE (ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1048     {
1049       u32  skip_bytes;
1050       ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t  *)data_this_buffer;
1051
1052       /* validate really icmp6 next */
1053       ASSERT(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6);
1054
1055       skip_bytes = 8* (1 + ext_hdr->n_data_u64s);
1056       data_this_buffer  = (void *)((u8 *)data_this_buffer + skip_bytes);
1057
1058       payload_length_host_byte_order  -= skip_bytes;
1059       headers_size += skip_bytes;
1060    }
1061
1062   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1063 #if DPDK > 0
1064   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1065   {
1066     struct rte_mbuf *mb = rte_mbuf_from_vlib_buffer(p0);
1067     u8 nb_segs = mb->nb_segs;
1068
1069     n_this_buffer = (p0->current_length > headers_size ?
1070                      p0->current_length - headers_size : 0);
1071     while (n_bytes_left)
1072       {
1073         sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1074         n_bytes_left -= n_this_buffer;
1075
1076         mb = mb->next;
1077         nb_segs--;
1078         if ((nb_segs == 0) || (mb == 0))
1079           break;
1080
1081         data_this_buffer = rte_ctrlmbuf_data(mb);
1082         n_this_buffer = mb->data_len;
1083       }
1084     if (n_bytes_left || nb_segs)
1085       {
1086         *bogus_lengthp = 1;
1087         return 0xfefe;
1088       }
1089   }
1090   else sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1091 #else
1092   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1093     n_this_buffer = p0->current_length > headers_size  ? p0->current_length - headers_size  : 0;
1094   while (1)
1095     {
1096       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1097       n_bytes_left -= n_this_buffer;
1098       if (n_bytes_left == 0)
1099         break;
1100
1101       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1102         {
1103           *bogus_lengthp = 1;
1104           return 0xfefe;
1105         }
1106       p0 = vlib_get_buffer (vm, p0->next_buffer);
1107       data_this_buffer = vlib_buffer_get_current (p0);
1108       n_this_buffer = p0->current_length;
1109     }
1110 #endif /* DPDK */
1111
1112   sum16 = ~ ip_csum_fold (sum0);
1113
1114   return sum16;
1115 }
1116
1117 u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1118 {
1119   ip6_header_t * ip0 = vlib_buffer_get_current (p0);
1120   udp_header_t * udp0;
1121   u16 sum16;
1122   int bogus_length;
1123
1124   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1125   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1126           || ip0->protocol == IP_PROTOCOL_ICMP6
1127           || ip0->protocol == IP_PROTOCOL_UDP
1128           || ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1129
1130   udp0 = (void *) (ip0 + 1);
1131   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1132     {
1133       p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1134                     | IP_BUFFER_L4_CHECKSUM_CORRECT);
1135       return p0->flags;
1136     }
1137
1138   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1139
1140   p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1141                 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1142
1143   return p0->flags;
1144 }
1145
1146 static uword
1147 ip6_local (vlib_main_t * vm,
1148            vlib_node_runtime_t * node,
1149            vlib_frame_t * frame)
1150 {
1151   ip6_main_t * im = &ip6_main;
1152   ip_lookup_main_t * lm = &im->lookup_main;
1153   ip_local_next_t next_index;
1154   u32 * from, * to_next, n_left_from, n_left_to_next;
1155   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1156
1157   from = vlib_frame_vector_args (frame);
1158   n_left_from = frame->n_vectors;
1159   next_index = node->cached_next_index;
1160
1161   if (node->flags & VLIB_NODE_FLAG_TRACE)
1162     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1163
1164   while (n_left_from > 0)
1165     {
1166       vlib_get_next_frame (vm, node, next_index,
1167                            to_next, n_left_to_next);
1168
1169       while (n_left_from >= 4 && n_left_to_next >= 2)
1170         {
1171           vlib_buffer_t * p0, * p1;
1172           ip6_header_t * ip0, * ip1;
1173           udp_header_t * udp0, * udp1;
1174           u32 pi0, ip_len0, udp_len0, flags0, next0;
1175           u32 pi1, ip_len1, udp_len1, flags1, next1;
1176           i32 len_diff0, len_diff1;
1177           u8 error0, type0, good_l4_checksum0;
1178           u8 error1, type1, good_l4_checksum1;
1179
1180           pi0 = to_next[0] = from[0];
1181           pi1 = to_next[1] = from[1];
1182           from += 2;
1183           n_left_from -= 2;
1184           to_next += 2;
1185           n_left_to_next -= 2;
1186
1187           p0 = vlib_get_buffer (vm, pi0);
1188           p1 = vlib_get_buffer (vm, pi1);
1189
1190           ip0 = vlib_buffer_get_current (p0);
1191           ip1 = vlib_buffer_get_current (p1);
1192
1193           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1194           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1195
1196           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1197           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1198
1199           flags0 = p0->flags;
1200           flags1 = p1->flags;
1201
1202           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1203           good_l4_checksum1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1204
1205           udp0 = ip6_next_header (ip0);
1206           udp1 = ip6_next_header (ip1);
1207
1208           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1209           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1210           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP && udp1->checksum == 0;
1211
1212           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1213           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1214
1215           /* Verify UDP length. */
1216           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1217           ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1218           udp_len0 = clib_net_to_host_u16 (udp0->length);
1219           udp_len1 = clib_net_to_host_u16 (udp1->length);
1220
1221           len_diff0 = ip_len0 - udp_len0;
1222           len_diff1 = ip_len1 - udp_len1;
1223
1224           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1225           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1226
1227           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1228                              && ! good_l4_checksum0
1229                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1230             {
1231               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1232               good_l4_checksum0 =
1233                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1234             }
1235           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1236                              && ! good_l4_checksum1
1237                              && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1238             {
1239               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1240               good_l4_checksum1 =
1241                 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1242             }
1243
1244           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1245
1246           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1247           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1248
1249           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1250           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1251           error0 = (! good_l4_checksum0
1252                     ? IP6_ERROR_UDP_CHECKSUM + type0
1253                     : error0);
1254           error1 = (! good_l4_checksum1
1255                     ? IP6_ERROR_UDP_CHECKSUM + type1
1256                     : error1);
1257
1258           /* Drop packets from unroutable hosts. */
1259           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1260           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1261               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1262               !ip6_address_is_link_local_unicast(&ip0->src_address))
1263             {
1264               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1265               error0 = (ADJ_INDEX_INVALID == src_adj_index0
1266                         ? IP6_ERROR_SRC_LOOKUP_MISS
1267                         : error0);
1268             }
1269           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1270               type1 != IP_BUILTIN_PROTOCOL_ICMP &&
1271               !ip6_address_is_link_local_unicast(&ip1->src_address))
1272             {
1273               u32 src_adj_index1 = ip6_src_lookup_for_packet (im, p1, ip1);
1274               error1 = (ADJ_INDEX_INVALID == src_adj_index1
1275                         ? IP6_ERROR_SRC_LOOKUP_MISS
1276                         : error1);
1277             }
1278
1279           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1280           next1 = error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1281
1282           p0->error = error_node->errors[error0];
1283           p1->error = error_node->errors[error1];
1284
1285           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1286                                            to_next, n_left_to_next,
1287                                            pi0, pi1, next0, next1);
1288         }
1289
1290       while (n_left_from > 0 && n_left_to_next > 0)
1291         {
1292           vlib_buffer_t * p0;
1293           ip6_header_t * ip0;
1294           udp_header_t * udp0;
1295           u32 pi0, ip_len0, udp_len0, flags0, next0;
1296           i32 len_diff0;
1297           u8 error0, type0, good_l4_checksum0;
1298
1299           pi0 = to_next[0] = from[0];
1300           from += 1;
1301           n_left_from -= 1;
1302           to_next += 1;
1303           n_left_to_next -= 1;
1304
1305           p0 = vlib_get_buffer (vm, pi0);
1306
1307           ip0 = vlib_buffer_get_current (p0);
1308
1309           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1310           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1311
1312           flags0 = p0->flags;
1313
1314           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1315
1316           udp0 = ip6_next_header (ip0);
1317
1318           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1319           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1320
1321           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1322
1323           /* Verify UDP length. */
1324           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1325           udp_len0 = clib_net_to_host_u16 (udp0->length);
1326
1327           len_diff0 = ip_len0 - udp_len0;
1328
1329           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1330
1331           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1332                              && ! good_l4_checksum0
1333                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1334             {
1335               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1336               good_l4_checksum0 =
1337                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1338             }
1339
1340           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1341
1342           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1343
1344           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1345           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1346           error0 = (! good_l4_checksum0
1347                     ? IP6_ERROR_UDP_CHECKSUM + type0
1348                     : error0);
1349
1350           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1351           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1352               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1353               !ip6_address_is_link_local_unicast(&ip0->src_address))
1354             {
1355               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1356               error0 = (ADJ_INDEX_INVALID == src_adj_index0
1357                         ? IP6_ERROR_SRC_LOOKUP_MISS
1358                         : error0);
1359             }
1360
1361           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1362
1363           p0->error = error_node->errors[error0];
1364
1365           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1366                                            to_next, n_left_to_next,
1367                                            pi0, next0);
1368         }
1369
1370       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1371     }
1372
1373   return frame->n_vectors;
1374 }
1375
1376 VLIB_REGISTER_NODE (ip6_local_node,static) = {
1377   .function = ip6_local,
1378   .name = "ip6-local",
1379   .vector_size = sizeof (u32),
1380
1381   .format_trace = format_ip6_forward_next_trace,
1382
1383   .n_next_nodes = IP_LOCAL_N_NEXT,
1384   .next_nodes = {
1385     [IP_LOCAL_NEXT_DROP] = "error-drop",
1386     [IP_LOCAL_NEXT_PUNT] = "error-punt",
1387     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1388     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1389   },
1390 };
1391
1392 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local)
1393
1394 void ip6_register_protocol (u32 protocol, u32 node_index)
1395 {
1396   vlib_main_t * vm = vlib_get_main();
1397   ip6_main_t * im = &ip6_main;
1398   ip_lookup_main_t * lm = &im->lookup_main;
1399
1400   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1401   lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip6_local_node.index, node_index);
1402 }
1403
1404 typedef enum {
1405   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1406   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
1407   IP6_DISCOVER_NEIGHBOR_N_NEXT,
1408 } ip6_discover_neighbor_next_t;
1409
1410 typedef enum {
1411   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
1412   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
1413   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
1414 } ip6_discover_neighbor_error_t;
1415
1416 static uword
1417 ip6_discover_neighbor_inline (vlib_main_t * vm,
1418                               vlib_node_runtime_t * node,
1419                               vlib_frame_t * frame,
1420                               int is_glean)
1421 {
1422   vnet_main_t * vnm = vnet_get_main();
1423   ip6_main_t * im = &ip6_main;
1424   ip_lookup_main_t * lm = &im->lookup_main;
1425   u32 * from, * to_next_drop;
1426   uword n_left_from, n_left_to_next_drop;
1427   static f64 time_last_seed_change = -1e100;
1428   static u32 hash_seeds[3];
1429   static uword hash_bitmap[256 / BITS (uword)];
1430   f64 time_now;
1431   int bogus_length;
1432
1433   if (node->flags & VLIB_NODE_FLAG_TRACE)
1434     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1435
1436   time_now = vlib_time_now (vm);
1437   if (time_now - time_last_seed_change > 1e-3)
1438     {
1439       uword i;
1440       u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
1441                                              sizeof (hash_seeds));
1442       for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1443         hash_seeds[i] = r[i];
1444
1445       /* Mark all hash keys as been not-seen before. */
1446       for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1447         hash_bitmap[i] = 0;
1448
1449       time_last_seed_change = time_now;
1450     }
1451
1452   from = vlib_frame_vector_args (frame);
1453   n_left_from = frame->n_vectors;
1454
1455   while (n_left_from > 0)
1456     {
1457       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1458                            to_next_drop, n_left_to_next_drop);
1459
1460       while (n_left_from > 0 && n_left_to_next_drop > 0)
1461         {
1462           vlib_buffer_t * p0;
1463           ip6_header_t * ip0;
1464           u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1465           uword bm0;
1466           ip_adjacency_t * adj0;
1467           vnet_hw_interface_t * hw_if0;
1468           u32 next0;
1469
1470           pi0 = from[0];
1471
1472           p0 = vlib_get_buffer (vm, pi0);
1473
1474           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1475
1476           ip0 = vlib_buffer_get_current (p0);
1477
1478           adj0 = ip_get_adjacency (lm, adj_index0);
1479
1480           if (!is_glean)
1481             {
1482               ip0->dst_address.as_u64[0] = adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
1483               ip0->dst_address.as_u64[1] = adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
1484             }
1485
1486           a0 = hash_seeds[0];
1487           b0 = hash_seeds[1];
1488           c0 = hash_seeds[2];
1489
1490           sw_if_index0 = adj0->rewrite_header.sw_if_index;
1491           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1492
1493           a0 ^= sw_if_index0;
1494           b0 ^= ip0->dst_address.as_u32[0];
1495           c0 ^= ip0->dst_address.as_u32[1];
1496
1497           hash_v3_mix32 (a0, b0, c0);
1498
1499           b0 ^= ip0->dst_address.as_u32[2];
1500           c0 ^= ip0->dst_address.as_u32[3];
1501
1502           hash_v3_finalize32 (a0, b0, c0);
1503
1504           c0 &= BITS (hash_bitmap) - 1;
1505           c0 = c0 / BITS (uword);
1506           m0 = (uword) 1 << (c0 % BITS (uword));
1507
1508           bm0 = hash_bitmap[c0];
1509           drop0 = (bm0 & m0) != 0;
1510
1511           /* Mark it as seen. */
1512           hash_bitmap[c0] = bm0 | m0;
1513
1514           from += 1;
1515           n_left_from -= 1;
1516           to_next_drop[0] = pi0;
1517           to_next_drop += 1;
1518           n_left_to_next_drop -= 1;
1519
1520           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1521
1522           /* If the interface is link-down, drop the pkt */
1523           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
1524             drop0 = 1;
1525
1526           p0->error =
1527             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
1528                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
1529           if (drop0)
1530             continue;
1531
1532           /*
1533            * the adj has been updated to a rewrite but the node the DPO that got
1534            * us here hasn't - yet. no big deal. we'll drop while we wait.
1535            */
1536           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1537             continue;
1538
1539           {
1540             u32 bi0 = 0;
1541             icmp6_neighbor_solicitation_header_t * h0;
1542             vlib_buffer_t * b0;
1543
1544             h0 = vlib_packet_template_get_packet
1545               (vm, &im->discover_neighbor_packet_template, &bi0);
1546
1547             /*
1548              * Build ethernet header.
1549              * Choose source address based on destination lookup
1550              * adjacency.
1551              */
1552             if (ip6_src_address_for_packet (lm,
1553                                             sw_if_index0,
1554                                             &h0->ip.src_address))
1555               {
1556                 /* There is no address on the interface */
1557                 p0->error = node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
1558                 vlib_buffer_free(vm, &bi0, 1);
1559                 continue;
1560               }
1561
1562             /*
1563              * Destination address is a solicited node multicast address.
1564              * We need to fill in
1565              * the low 24 bits with low 24 bits of target's address.
1566              */
1567             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
1568             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
1569             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
1570
1571             h0->neighbor.target_address = ip0->dst_address;
1572
1573             clib_memcpy (h0->link_layer_option.ethernet_address,
1574                     hw_if0->hw_address, vec_len (hw_if0->hw_address));
1575
1576             /* $$$$ appears we need this; why is the checksum non-zero? */
1577             h0->neighbor.icmp.checksum = 0;
1578             h0->neighbor.icmp.checksum =
1579               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
1580                                                  &bogus_length);
1581
1582             ASSERT (bogus_length == 0);
1583
1584             vlib_buffer_copy_trace_flag (vm, p0, bi0);
1585             b0 = vlib_get_buffer (vm, bi0);
1586             vnet_buffer (b0)->sw_if_index[VLIB_TX]
1587               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
1588
1589             /* Add rewrite/encap string. */
1590             vnet_rewrite_one_header (adj0[0], h0,
1591                                      sizeof (ethernet_header_t));
1592             vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1593
1594             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
1595
1596             vlib_set_next_frame_buffer (vm, node, next0, bi0);
1597           }
1598         }
1599
1600       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1601                            n_left_to_next_drop);
1602     }
1603
1604   return frame->n_vectors;
1605 }
1606
1607 static uword
1608 ip6_discover_neighbor (vlib_main_t * vm,
1609                        vlib_node_runtime_t * node,
1610                        vlib_frame_t * frame)
1611 {
1612     return (ip6_discover_neighbor_inline(vm, node, frame, 0));
1613 }
1614
1615 static uword
1616 ip6_glean (vlib_main_t * vm,
1617            vlib_node_runtime_t * node,
1618            vlib_frame_t * frame)
1619 {
1620     return (ip6_discover_neighbor_inline(vm, node, frame, 1));
1621 }
1622
1623 static char * ip6_discover_neighbor_error_strings[] = {
1624   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
1625   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]
1626   = "neighbor solicitations sent",
1627   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
1628     = "no source address for ND solicitation",
1629 };
1630
1631 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = {
1632   .function = ip6_discover_neighbor,
1633   .name = "ip6-discover-neighbor",
1634   .vector_size = sizeof (u32),
1635
1636   .format_trace = format_ip6_forward_next_trace,
1637
1638   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
1639   .error_strings = ip6_discover_neighbor_error_strings,
1640
1641   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
1642   .next_nodes = {
1643     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
1644     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
1645   },
1646 };
1647
1648 VLIB_REGISTER_NODE (ip6_glean_node) = {
1649   .function = ip6_glean,
1650   .name = "ip6-glean",
1651   .vector_size = sizeof (u32),
1652
1653   .format_trace = format_ip6_forward_next_trace,
1654
1655   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
1656   .error_strings = ip6_discover_neighbor_error_strings,
1657
1658   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
1659   .next_nodes = {
1660     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
1661     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
1662   },
1663 };
1664
1665 clib_error_t *
1666 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
1667 {
1668   vnet_main_t * vnm = vnet_get_main();
1669   ip6_main_t * im = &ip6_main;
1670   icmp6_neighbor_solicitation_header_t * h;
1671   ip6_address_t * src;
1672   ip_interface_address_t * ia;
1673   ip_adjacency_t * adj;
1674   vnet_hw_interface_t * hi;
1675   vnet_sw_interface_t * si;
1676   vlib_buffer_t * b;
1677   u32 bi = 0;
1678   int bogus_length;
1679
1680   si = vnet_get_sw_interface (vnm, sw_if_index);
1681
1682   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1683     {
1684       return clib_error_return (0, "%U: interface %U down",
1685                                 format_ip6_address, dst,
1686                                 format_vnet_sw_if_index_name, vnm,
1687                                 sw_if_index);
1688     }
1689
1690   src = ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1691   if (! src)
1692     {
1693       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1694       return clib_error_return
1695         (0, "no matching interface address for destination %U (interface %U)",
1696          format_ip6_address, dst,
1697          format_vnet_sw_if_index_name, vnm, sw_if_index);
1698     }
1699
1700   h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi);
1701
1702   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1703
1704   /* Destination address is a solicited node multicast address.  We need to fill in
1705      the low 24 bits with low 24 bits of target's address. */
1706   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1707   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1708   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1709
1710   h->ip.src_address = src[0];
1711   h->neighbor.target_address = dst[0];
1712
1713   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address));
1714
1715   h->neighbor.icmp.checksum =
1716     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1717   ASSERT(bogus_length == 0);
1718
1719   b = vlib_get_buffer (vm, bi);
1720   vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1721
1722   /* Add encapsulation string for software interface (e.g. ethernet header). */
1723   adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
1724   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1725   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1726
1727   {
1728     vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
1729     u32 * to_next = vlib_frame_vector_args (f);
1730     to_next[0] = bi;
1731     f->n_vectors = 1;
1732     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1733   }
1734
1735   return /* no error */ 0;
1736 }
1737
1738 typedef enum {
1739   IP6_REWRITE_NEXT_DROP,
1740   IP6_REWRITE_NEXT_ICMP_ERROR,
1741 } ip6_rewrite_next_t;
1742
1743 always_inline uword
1744 ip6_rewrite_inline (vlib_main_t * vm,
1745                     vlib_node_runtime_t * node,
1746                     vlib_frame_t * frame,
1747                     int rewrite_for_locally_received_packets,
1748                     int is_midchain)
1749 {
1750   ip_lookup_main_t * lm = &ip6_main.lookup_main;
1751   u32 * from = vlib_frame_vector_args (frame);
1752   u32 n_left_from, n_left_to_next, * to_next, next_index;
1753   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1754   vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
1755
1756   n_left_from = frame->n_vectors;
1757   next_index = node->cached_next_index;
1758   u32 cpu_index = os_get_cpu_number();
1759
1760   while (n_left_from > 0)
1761     {
1762       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1763
1764       while (n_left_from >= 4 && n_left_to_next >= 2)
1765         {
1766           ip_adjacency_t * adj0, * adj1;
1767           vlib_buffer_t * p0, * p1;
1768           ip6_header_t * ip0, * ip1;
1769           u32 pi0, rw_len0, next0, error0, adj_index0;
1770           u32 pi1, rw_len1, next1, error1, adj_index1;
1771           u32 tx_sw_if_index0, tx_sw_if_index1;
1772
1773           /* Prefetch next iteration. */
1774           {
1775             vlib_buffer_t * p2, * p3;
1776
1777             p2 = vlib_get_buffer (vm, from[2]);
1778             p3 = vlib_get_buffer (vm, from[3]);
1779
1780             vlib_prefetch_buffer_header (p2, LOAD);
1781             vlib_prefetch_buffer_header (p3, LOAD);
1782
1783             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1784             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1785
1786             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1787             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1788           }
1789
1790           pi0 = to_next[0] = from[0];
1791           pi1 = to_next[1] = from[1];
1792
1793           from += 2;
1794           n_left_from -= 2;
1795           to_next += 2;
1796           n_left_to_next -= 2;
1797
1798           p0 = vlib_get_buffer (vm, pi0);
1799           p1 = vlib_get_buffer (vm, pi1);
1800
1801           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
1802           adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
1803
1804           /* We should never rewrite a pkt using the MISS adjacency */
1805           ASSERT(adj_index0 && adj_index1);
1806
1807           ip0 = vlib_buffer_get_current (p0);
1808           ip1 = vlib_buffer_get_current (p1);
1809
1810           error0 = error1 = IP6_ERROR_NONE;
1811           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1812
1813           if (! rewrite_for_locally_received_packets)
1814             {
1815               i32 hop_limit0 = ip0->hop_limit, hop_limit1 = ip1->hop_limit;
1816
1817               /* Input node should have reject packets with hop limit 0. */
1818               ASSERT (ip0->hop_limit > 0);
1819               ASSERT (ip1->hop_limit > 0);
1820
1821               hop_limit0 -= 1;
1822               hop_limit1 -= 1;
1823
1824               ip0->hop_limit = hop_limit0;
1825               ip1->hop_limit = hop_limit1;
1826
1827               /*
1828                * If the hop count drops below 1 when forwarding, generate
1829                * an ICMP response.
1830                */
1831               if (PREDICT_FALSE(hop_limit0 <= 0))
1832                 {
1833                   error0 = IP6_ERROR_TIME_EXPIRED;
1834                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1835                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32)~0;
1836                   icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
1837                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1838                 }
1839               if (PREDICT_FALSE(hop_limit1 <= 0))
1840                 {
1841                   error1 = IP6_ERROR_TIME_EXPIRED;
1842                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1843                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32)~0;
1844                   icmp6_error_set_vnet_buffer(p1, ICMP6_time_exceeded,
1845                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1846                 }
1847             }
1848
1849           adj0 = ip_get_adjacency (lm, adj_index0);
1850           adj1 = ip_get_adjacency (lm, adj_index1);
1851
1852           rw_len0 = adj0[0].rewrite_header.data_bytes;
1853           rw_len1 = adj1[0].rewrite_header.data_bytes;
1854           vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
1855           vnet_buffer(p1)->ip.save_rewrite_length = rw_len1;
1856
1857           vlib_increment_combined_counter (&adjacency_counters,
1858                                            cpu_index,
1859                                            adj_index0,
1860                                            /* packet increment */ 0,
1861                                            /* byte increment */ rw_len0);
1862           vlib_increment_combined_counter (&adjacency_counters,
1863                                            cpu_index,
1864                                            adj_index1,
1865                                            /* packet increment */ 0,
1866                                            /* byte increment */ rw_len1);
1867
1868           /* Check MTU of outgoing interface. */
1869           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
1870                     ? IP6_ERROR_MTU_EXCEEDED
1871                     : error0);
1872           error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
1873                     ? IP6_ERROR_MTU_EXCEEDED
1874                     : error1);
1875
1876           /* Don't adjust the buffer for hop count issue; icmp-error node
1877            * wants to see the IP headerr */
1878           if (PREDICT_TRUE(error0 == IP6_ERROR_NONE))
1879             {
1880               p0->current_data -= rw_len0;
1881               p0->current_length += rw_len0;
1882
1883               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1884               vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1885                   tx_sw_if_index0;
1886               next0 = adj0[0].rewrite_header.next_index;
1887
1888               vnet_feature_arc_start(lm->output_feature_arc_index,
1889                                      tx_sw_if_index0, &next0, p0);
1890             }
1891           if (PREDICT_TRUE(error1 == IP6_ERROR_NONE))
1892             {
1893               p1->current_data -= rw_len1;
1894               p1->current_length += rw_len1;
1895
1896               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1897               vnet_buffer (p1)->sw_if_index[VLIB_TX] =
1898                   tx_sw_if_index1;
1899               next1 = adj1[0].rewrite_header.next_index;
1900
1901               vnet_feature_arc_start(lm->output_feature_arc_index,
1902                                      tx_sw_if_index1, &next1, p1);
1903             }
1904
1905           /* Guess we are only writing on simple Ethernet header. */
1906           vnet_rewrite_two_headers (adj0[0], adj1[0],
1907                                     ip0, ip1,
1908                                     sizeof (ethernet_header_t));
1909
1910           if (is_midchain)
1911           {
1912               adj0->sub_type.midchain.fixup_func(vm, adj0, p0);
1913               adj1->sub_type.midchain.fixup_func(vm, adj1, p1);
1914           }
1915
1916           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1917                                            to_next, n_left_to_next,
1918                                            pi0, pi1, next0, next1);
1919         }
1920
1921       while (n_left_from > 0 && n_left_to_next > 0)
1922         {
1923           ip_adjacency_t * adj0;
1924           vlib_buffer_t * p0;
1925           ip6_header_t * ip0;
1926           u32 pi0, rw_len0;
1927           u32 adj_index0, next0, error0;
1928           u32 tx_sw_if_index0;
1929
1930           pi0 = to_next[0] = from[0];
1931
1932           p0 = vlib_get_buffer (vm, pi0);
1933
1934           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
1935
1936           /* We should never rewrite a pkt using the MISS adjacency */
1937           ASSERT(adj_index0);
1938
1939           adj0 = ip_get_adjacency (lm, adj_index0);
1940
1941           ip0 = vlib_buffer_get_current (p0);
1942
1943           error0 = IP6_ERROR_NONE;
1944           next0 = IP6_REWRITE_NEXT_DROP;
1945
1946           /* Check hop limit */
1947           if (! rewrite_for_locally_received_packets)
1948             {
1949               i32 hop_limit0 = ip0->hop_limit;
1950
1951               ASSERT (ip0->hop_limit > 0);
1952
1953               hop_limit0 -= 1;
1954
1955               ip0->hop_limit = hop_limit0;
1956
1957               if (PREDICT_FALSE(hop_limit0 <= 0))
1958                 {
1959                   /*
1960                    * If the hop count drops below 1 when forwarding, generate
1961                    * an ICMP response.
1962                    */
1963                   error0 = IP6_ERROR_TIME_EXPIRED;
1964                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1965                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32)~0;
1966                   icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
1967                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1968                 }
1969             }
1970
1971           /* Guess we are only writing on simple Ethernet header. */
1972           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1973
1974           /* Update packet buffer attributes/set output interface. */
1975           rw_len0 = adj0[0].rewrite_header.data_bytes;
1976           vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
1977
1978           vlib_increment_combined_counter (&adjacency_counters,
1979                                            cpu_index,
1980                                            adj_index0,
1981                                            /* packet increment */ 0,
1982                                            /* byte increment */ rw_len0);
1983
1984           /* Check MTU of outgoing interface. */
1985           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
1986                     ? IP6_ERROR_MTU_EXCEEDED
1987                     : error0);
1988
1989           /* Don't adjust the buffer for hop count issue; icmp-error node
1990            * wants to see the IP headerr */
1991           if (PREDICT_TRUE(error0 == IP6_ERROR_NONE))
1992             {
1993               p0->current_data -= rw_len0;
1994               p0->current_length += rw_len0;
1995
1996               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1997
1998               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1999               next0 = adj0[0].rewrite_header.next_index;
2000
2001               vnet_feature_arc_start(lm->output_feature_arc_index,
2002                                      tx_sw_if_index0, &next0, p0);
2003             }
2004
2005           if (is_midchain)
2006           {
2007               adj0->sub_type.midchain.fixup_func(vm, adj0, p0);
2008           }
2009
2010           p0->error = error_node->errors[error0];
2011
2012           from += 1;
2013           n_left_from -= 1;
2014           to_next += 1;
2015           n_left_to_next -= 1;
2016
2017           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2018                                            to_next, n_left_to_next,
2019                                            pi0, next0);
2020         }
2021
2022       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2023     }
2024
2025   /* Need to do trace after rewrites to pick up new packet data. */
2026   if (node->flags & VLIB_NODE_FLAG_TRACE)
2027     ip6_forward_next_trace (vm, node, frame, adj_rx_tx);
2028
2029   return frame->n_vectors;
2030 }
2031
2032 static uword
2033 ip6_rewrite_transit (vlib_main_t * vm,
2034                      vlib_node_runtime_t * node,
2035                      vlib_frame_t * frame)
2036 {
2037   return ip6_rewrite_inline (vm, node, frame,
2038                              /* rewrite_for_locally_received_packets */ 0,
2039                              /* midchain */ 0);
2040 }
2041
2042 static uword
2043 ip6_rewrite_local (vlib_main_t * vm,
2044                    vlib_node_runtime_t * node,
2045                    vlib_frame_t * frame)
2046 {
2047   return ip6_rewrite_inline (vm, node, frame,
2048                              /* rewrite_for_locally_received_packets */ 1,
2049                              /* midchain */ 0);
2050 }
2051
2052 static uword
2053 ip6_midchain (vlib_main_t * vm,
2054               vlib_node_runtime_t * node,
2055               vlib_frame_t * frame)
2056 {
2057   return ip6_rewrite_inline (vm, node, frame,
2058                              /* rewrite_for_locally_received_packets */ 0,
2059                              /* midchain */ 1);
2060 }
2061
2062 VLIB_REGISTER_NODE (ip6_midchain_node) = {
2063   .function = ip6_midchain,
2064   .name = "ip6-midchain",
2065   .vector_size = sizeof (u32),
2066
2067   .format_trace = format_ip6_forward_next_trace,
2068
2069   .sibling_of = "ip6-rewrite",
2070 };
2071
2072 VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain)
2073
2074 VLIB_REGISTER_NODE (ip6_rewrite_node) = {
2075   .function = ip6_rewrite_transit,
2076   .name = "ip6-rewrite",
2077   .vector_size = sizeof (u32),
2078
2079   .format_trace = format_ip6_rewrite_trace,
2080
2081   .n_next_nodes = 2,
2082   .next_nodes = {
2083     [IP6_REWRITE_NEXT_DROP] = "error-drop",
2084     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2085   },
2086 };
2087
2088 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite_transit);
2089
2090 VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
2091   .function = ip6_rewrite_local,
2092   .name = "ip6-rewrite-local",
2093   .vector_size = sizeof (u32),
2094
2095   .sibling_of = "ip6-rewrite",
2096
2097   .format_trace = format_ip6_rewrite_trace,
2098
2099   .n_next_nodes = 0,
2100 };
2101
2102 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_local_node, ip6_rewrite_local);
2103
2104 /*
2105  * Hop-by-Hop handling
2106  */
2107
2108 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2109
2110 #define foreach_ip6_hop_by_hop_error \
2111 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2112 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2113 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2114
2115 typedef enum {
2116 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2117   foreach_ip6_hop_by_hop_error
2118 #undef _
2119   IP6_HOP_BY_HOP_N_ERROR,
2120 } ip6_hop_by_hop_error_t;
2121
2122 /*
2123  * Primary h-b-h handler trace support
2124  * We work pretty hard on the problem for obvious reasons
2125  */
2126 typedef struct {
2127   u32 next_index;
2128   u32 trace_len;
2129   u8 option_data[256];
2130 } ip6_hop_by_hop_trace_t;
2131
2132 vlib_node_registration_t ip6_hop_by_hop_node;
2133
2134 static char * ip6_hop_by_hop_error_strings[] = {
2135 #define _(sym,string) string,
2136   foreach_ip6_hop_by_hop_error
2137 #undef _
2138 };
2139
2140 static u8 *
2141 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2142 {
2143   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2144   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2145   ip6_hop_by_hop_trace_t * t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2146   ip6_hop_by_hop_header_t *hbh0;
2147   ip6_hop_by_hop_option_t *opt0, *limit0;
2148   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2149
2150   u8 type0;
2151
2152   hbh0 = (ip6_hop_by_hop_header_t *)t->option_data;
2153
2154   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2155               t->next_index, (hbh0->length+1)<<3, t->trace_len);
2156
2157   opt0 = (ip6_hop_by_hop_option_t *) (hbh0+1);
2158   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *)hbh0) + t->trace_len;
2159
2160   while (opt0 < limit0) {
2161     type0 = opt0->type;
2162     switch (type0) {
2163     case 0: /* Pad, just stop */
2164       opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2165       break;
2166
2167     default:
2168       if (hm->trace[type0]) {
2169         s = (*hm->trace[type0])(s, opt0);
2170       } else {
2171         s = format (s, "\n    unrecognized option %d length %d", type0, opt0->length);
2172       }
2173       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2174       break;
2175     }
2176   }
2177   return s;
2178 }
2179
2180 always_inline u8 ip6_scan_hbh_options (
2181                                        vlib_buffer_t * b0,
2182                                        ip6_header_t *ip0,
2183                                        ip6_hop_by_hop_header_t *hbh0,
2184                                        ip6_hop_by_hop_option_t *opt0,
2185                                        ip6_hop_by_hop_option_t *limit0,
2186                                        u32 *next0)
2187 {
2188   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2189   u8 type0;
2190   u8 error0 = 0;
2191
2192   while (opt0 < limit0)
2193     {
2194       type0 = opt0->type;
2195       switch (type0)
2196         {
2197         case 0: /* Pad1 */
2198           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2199           continue;
2200         case 1: /* PadN */
2201           break;
2202         default:
2203           if (hm->options[type0])
2204             {
2205               if ((*hm->options[type0])(b0, ip0, opt0) < 0)
2206                 {
2207                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2208                   return(error0);
2209                 }
2210             }
2211           else
2212             {
2213               /* Unrecognized mandatory option, check the two high order bits */
2214               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2215                 {
2216                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2217                   break;
2218                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2219                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2220                   *next0 = IP_LOOKUP_NEXT_DROP;
2221                   break;
2222                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2223                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2224                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2225                   icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2226                                               ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2227                   break;
2228                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2229                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2230                   if (!ip6_address_is_multicast(&ip0->dst_address))
2231                     {
2232                       *next0 =  IP_LOOKUP_NEXT_ICMP_ERROR;
2233                       icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2234                                                   ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2235                     }
2236                   else
2237                     {
2238                       *next0 =  IP_LOOKUP_NEXT_DROP;
2239                     }
2240                   break;
2241                 }
2242               return(error0);
2243             }
2244         }
2245       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2246     }
2247   return(error0);
2248 }
2249
2250 /*
2251  * Process the Hop-by-Hop Options header
2252  */
2253 static uword
2254 ip6_hop_by_hop (vlib_main_t * vm,
2255                 vlib_node_runtime_t * node,
2256                 vlib_frame_t * frame)
2257 {
2258   vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip6_hop_by_hop_node.index);
2259   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2260   u32 n_left_from, *from, *to_next;
2261   ip_lookup_next_t next_index;
2262   ip6_main_t * im = &ip6_main;
2263   ip_lookup_main_t *lm = &im->lookup_main;
2264
2265   from = vlib_frame_vector_args (frame);
2266   n_left_from = frame->n_vectors;
2267   next_index = node->cached_next_index;
2268
2269   while (n_left_from > 0) {
2270     u32 n_left_to_next;
2271
2272     vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2273
2274     while (n_left_from >= 4 && n_left_to_next >= 2) {
2275       u32 bi0, bi1;
2276       vlib_buffer_t * b0, *b1;
2277       u32 next0, next1;
2278       ip6_header_t * ip0, *ip1;
2279       ip6_hop_by_hop_header_t *hbh0, *hbh1;
2280       ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2281       u8 error0 = 0, error1 = 0;
2282
2283       /* Prefetch next iteration. */
2284       {
2285         vlib_buffer_t * p2, * p3;
2286
2287         p2 = vlib_get_buffer (vm, from[2]);
2288         p3 = vlib_get_buffer (vm, from[3]);
2289
2290         vlib_prefetch_buffer_header (p2, LOAD);
2291         vlib_prefetch_buffer_header (p3, LOAD);
2292
2293         CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
2294         CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
2295       }
2296
2297       /* Speculatively enqueue b0, b1 to the current next frame */
2298       to_next[0] = bi0 = from[0];
2299       to_next[1] = bi1 = from[1];
2300       from += 2;
2301       to_next += 2;
2302       n_left_from -= 2;
2303       n_left_to_next -= 2;
2304
2305       b0 = vlib_get_buffer (vm, bi0);
2306       b1 = vlib_get_buffer (vm, bi1);
2307
2308       /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2309       u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
2310       ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
2311       u32 adj_index1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
2312       ip_adjacency_t *adj1 = ip_get_adjacency(lm, adj_index1);
2313
2314       /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2315       next0 = adj0->lookup_next_index;
2316       next1 = adj1->lookup_next_index;
2317
2318       ip0 = vlib_buffer_get_current (b0);
2319       ip1 = vlib_buffer_get_current (b1);
2320       hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
2321       hbh1 = (ip6_hop_by_hop_header_t *)(ip1+1);
2322       opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
2323       opt1 = (ip6_hop_by_hop_option_t *)(hbh1+1);
2324       limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
2325       limit1 = (ip6_hop_by_hop_option_t *)((u8 *)hbh1 + ((hbh1->length + 1) << 3));
2326
2327       /*
2328        * Basic validity checks
2329        */
2330       if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
2331         error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2332         next0 = IP_LOOKUP_NEXT_DROP;
2333         goto outdual;
2334       }
2335       /* Scan the set of h-b-h options, process ones that we understand */
2336       error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
2337
2338       if ((hbh1->length + 1) << 3 > clib_net_to_host_u16(ip1->payload_length)) {
2339         error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2340         next1 = IP_LOOKUP_NEXT_DROP;
2341         goto outdual;
2342       }
2343       /* Scan the set of h-b-h options, process ones that we understand */
2344       error1 = ip6_scan_hbh_options(b1,ip1,hbh1,opt1,limit1, &next1);
2345
2346     outdual:
2347       /* Has the classifier flagged this buffer for special treatment? */
2348       if (PREDICT_FALSE((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index & OI_DECAP)))
2349         next0 = hm->next_override;
2350
2351       /* Has the classifier flagged this buffer for special treatment? */
2352       if (PREDICT_FALSE((error1 == 0) && (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             ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
2359             u32 trace_len = (hbh0->length + 1) << 3;
2360             t->next_index = next0;
2361             /* Capture the h-b-h option verbatim */
2362             trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2363             t->trace_len = trace_len;
2364             clib_memcpy(t->option_data, hbh0, trace_len);
2365           }
2366           if (b1->flags & VLIB_BUFFER_IS_TRACED) {
2367             ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b1, sizeof (*t));
2368             u32 trace_len = (hbh1->length + 1) << 3;
2369             t->next_index = next1;
2370             /* Capture the h-b-h option verbatim */
2371             trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2372             t->trace_len = trace_len;
2373             clib_memcpy(t->option_data, hbh1, trace_len);
2374           }
2375
2376         }
2377
2378       b0->error = error_node->errors[error0];
2379       b1->error = error_node->errors[error1];
2380
2381       /* verify speculative enqueue, maybe switch current next frame */
2382       vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0,
2383                                        bi1,next0, next1);
2384     }
2385
2386     while (n_left_from > 0 && n_left_to_next > 0) {
2387       u32 bi0;
2388       vlib_buffer_t * b0;
2389       u32 next0;
2390       ip6_header_t * ip0;
2391       ip6_hop_by_hop_header_t *hbh0;
2392       ip6_hop_by_hop_option_t *opt0, *limit0;
2393       u8 error0 = 0;
2394
2395       /* Speculatively enqueue b0 to the current next frame */
2396       bi0 = from[0];
2397       to_next[0] = bi0;
2398       from += 1;
2399       to_next += 1;
2400       n_left_from -= 1;
2401       n_left_to_next -= 1;
2402
2403       b0 = vlib_get_buffer (vm, bi0);
2404       /*
2405        * Default use the next_index from the adjacency.
2406        * A HBH option rarely redirects to a different node
2407        */
2408       u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
2409       ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
2410       next0 = adj0->lookup_next_index;
2411
2412       ip0 = vlib_buffer_get_current (b0);
2413       hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
2414       opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
2415       limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
2416
2417       /*
2418        * Basic validity checks
2419        */
2420       if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
2421         error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2422         next0 = IP_LOOKUP_NEXT_DROP;
2423         goto out0;
2424       }
2425
2426       /* Scan the set of h-b-h options, process ones that we understand */
2427       error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
2428
2429     out0:
2430       /* Has the classifier flagged this buffer for special treatment? */
2431     if (PREDICT_FALSE((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index & OI_DECAP)))
2432         next0 = hm->next_override;
2433
2434       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
2435         ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
2436         u32 trace_len = (hbh0->length + 1) << 3;
2437         t->next_index = next0;
2438         /* Capture the h-b-h option verbatim */
2439         trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2440         t->trace_len = trace_len;
2441         clib_memcpy(t->option_data, hbh0, trace_len);
2442       }
2443
2444       b0->error = error_node->errors[error0];
2445
2446       /* verify speculative enqueue, maybe switch current next frame */
2447       vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0);
2448     }
2449     vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2450   }
2451   return frame->n_vectors;
2452 }
2453
2454 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) = {
2455   .function = ip6_hop_by_hop,
2456   .name = "ip6-hop-by-hop",
2457   .sibling_of = "ip6-lookup",
2458   .vector_size = sizeof (u32),
2459   .format_trace = format_ip6_hop_by_hop_trace,
2460   .type = VLIB_NODE_TYPE_INTERNAL,
2461   .n_errors = ARRAY_LEN(ip6_hop_by_hop_error_strings),
2462   .error_strings = ip6_hop_by_hop_error_strings,
2463   .n_next_nodes = 0,
2464 };
2465
2466 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
2467
2468 static clib_error_t *
2469 ip6_hop_by_hop_init (vlib_main_t * vm)
2470 {
2471   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2472   memset(hm->options, 0, sizeof(hm->options));
2473   memset(hm->trace, 0, sizeof(hm->trace));
2474   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2475   return (0);
2476 }
2477
2478 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2479
2480 void ip6_hbh_set_next_override (uword next)
2481 {
2482   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2483
2484   hm->next_override = next;
2485 }
2486
2487 int
2488 ip6_hbh_register_option (u8 option,
2489                          int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
2490                          u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt))
2491 {
2492   ip6_main_t * im = &ip6_main;
2493   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2494
2495   ASSERT (option < ARRAY_LEN (hm->options));
2496
2497   /* Already registered */
2498   if (hm->options[option])
2499     return (-1);
2500
2501   hm->options[option] = options;
2502   hm->trace[option] = trace;
2503
2504   /* Set global variable */
2505   im->hbh_enabled = 1;
2506
2507   return (0);
2508 }
2509
2510 int
2511 ip6_hbh_unregister_option (u8 option)
2512 {
2513   ip6_main_t * im = &ip6_main;
2514   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2515
2516   ASSERT (option < ARRAY_LEN (hm->options));
2517
2518   /* Not registered */
2519   if (!hm->options[option])
2520     return (-1);
2521
2522   hm->options[option] = NULL;
2523   hm->trace[option] = NULL;
2524
2525   /* Disable global knob if this was the last option configured */
2526   int i;
2527   bool found = false;
2528   for (i = 0; i < 256; i++) {
2529     if (hm->options[option]) {
2530       found = true;
2531       break;
2532     }
2533   }
2534   if (!found)
2535     im->hbh_enabled = 0;
2536
2537   return (0);
2538 }
2539
2540 /* Global IP6 main. */
2541 ip6_main_t ip6_main;
2542
2543 static clib_error_t *
2544 ip6_lookup_init (vlib_main_t * vm)
2545 {
2546   ip6_main_t * im = &ip6_main;
2547   clib_error_t * error;
2548   uword i;
2549
2550   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2551     return error;
2552
2553   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2554     {
2555       u32 j, i0, i1;
2556
2557       i0 = i / 32;
2558       i1 = i % 32;
2559
2560       for (j = 0; j < i0; j++)
2561         im->fib_masks[i].as_u32[j] = ~0;
2562
2563       if (i1)
2564         im->fib_masks[i].as_u32[i0] = clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2565     }
2566
2567   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2568
2569   if (im->lookup_table_nbuckets == 0)
2570     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2571
2572   im->lookup_table_nbuckets = 1<< max_log2 (im->lookup_table_nbuckets);
2573
2574   if (im->lookup_table_size == 0)
2575     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2576
2577   BV(clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2578                         "ip6 FIB fwding table",
2579                         im->lookup_table_nbuckets,
2580                         im->lookup_table_size);
2581   BV(clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2582                         "ip6 FIB non-fwding table",
2583                         im->lookup_table_nbuckets,
2584                         im->lookup_table_size);
2585
2586   /* Create FIB with index 0 and table id of 0. */
2587   fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6, 0);
2588
2589   {
2590     pg_node_t * pn;
2591     pn = pg_get_node (ip6_lookup_node.index);
2592     pn->unformat_edit = unformat_pg_ip6_header;
2593   }
2594
2595   /* Unless explicitly configured, don't process HBH options */
2596   im->hbh_enabled = 0;
2597
2598   {
2599     icmp6_neighbor_solicitation_header_t p;
2600
2601     memset (&p, 0, sizeof (p));
2602
2603     p.ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2604     p.ip.payload_length = clib_host_to_net_u16 (sizeof (p)
2605                                                 - STRUCT_OFFSET_OF (icmp6_neighbor_solicitation_header_t, neighbor));
2606     p.ip.protocol = IP_PROTOCOL_ICMP6;
2607     p.ip.hop_limit = 255;
2608     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2609
2610     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2611
2612     p.link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2613     p.link_layer_option.header.n_data_u64s = sizeof (p.link_layer_option) / sizeof (u64);
2614
2615     vlib_packet_template_init (vm,
2616                                &im->discover_neighbor_packet_template,
2617                                &p, sizeof (p),
2618                                /* alloc chunk size */ 8,
2619                                "ip6 neighbor discovery");
2620   }
2621
2622   return error;
2623 }
2624
2625 VLIB_INIT_FUNCTION (ip6_lookup_init);
2626
2627 static clib_error_t *
2628 add_del_ip6_interface_table (vlib_main_t * vm,
2629                              unformat_input_t * input,
2630                              vlib_cli_command_t * cmd)
2631 {
2632   vnet_main_t * vnm = vnet_get_main();
2633   clib_error_t * error = 0;
2634   u32 sw_if_index, table_id;
2635
2636   sw_if_index = ~0;
2637
2638   if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2639     {
2640       error = clib_error_return (0, "unknown interface `%U'",
2641                                  format_unformat_error, input);
2642       goto done;
2643     }
2644
2645   if (unformat (input, "%d", &table_id))
2646     ;
2647   else
2648     {
2649       error = clib_error_return (0, "expected table id `%U'",
2650                                  format_unformat_error, input);
2651       goto done;
2652     }
2653
2654   {
2655     u32 fib_index = fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6,
2656                                                       table_id);
2657
2658     vec_validate (ip6_main.fib_index_by_sw_if_index, sw_if_index);
2659     ip6_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
2660   }
2661
2662
2663  done:
2664   return error;
2665 }
2666
2667 /*?
2668  * Place the indicated interface into the supplied IPv6 FIB table (also known
2669  * as a VRF). If the FIB table does not exist, this command creates it. To
2670  * display the current IPv6 FIB table, use the command '<em>show ip6 fib</em>'.
2671  * FIB table will only be displayed if a route has been added to the table, or
2672  * an IP Address is assigned to an interface in the table (which adds a route
2673  * automatically).
2674  *
2675  * @note IP addresses added after setting the interface IP table end up in
2676  * the indicated FIB table. If the IP address is added prior to adding the
2677  * interface to the FIB table, it will NOT be part of the FIB table. Predictable
2678  * but potentially counter-intuitive results occur if you provision interface
2679  * addresses in multiple FIBs. Upon RX, packets will be processed in the last
2680  * IP table ID provisioned. It might be marginally useful to evade source RPF
2681  * drops to put an interface address into multiple FIBs.
2682  *
2683  * @cliexpar
2684  * Example of how to add an interface to an IPv6 FIB table (where 2 is the table-id):
2685  * @cliexcmd{set interface ip6 table GigabitEthernet2/0/0 2}
2686  ?*/
2687 /* *INDENT-OFF* */
2688 VLIB_CLI_COMMAND (set_interface_ip6_table_command, static) = {
2689   .path = "set interface ip6 table",
2690   .function = add_del_ip6_interface_table,
2691   .short_help = "set interface ip6 table <interface> <table-id>"
2692 };
2693 /* *INDENT-ON* */
2694
2695 void
2696 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
2697                                                   u8 *mac)
2698 {
2699   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2700   /* Invert the "u" bit */
2701   ip->as_u8 [8] = mac[0] ^ (1<<1);
2702   ip->as_u8 [9] = mac[1];
2703   ip->as_u8 [10] = mac[2];
2704   ip->as_u8 [11] = 0xFF;
2705   ip->as_u8 [12] = 0xFE;
2706   ip->as_u8 [13] = mac[3];
2707   ip->as_u8 [14] = mac[4];
2708   ip->as_u8 [15] = mac[5];
2709 }
2710
2711 void
2712 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
2713                                                   ip6_address_t *ip)
2714 {
2715   /* Invert the previously inverted "u" bit */
2716   mac[0] = ip->as_u8 [8] ^ (1<<1);
2717   mac[1] = ip->as_u8 [9];
2718   mac[2] = ip->as_u8 [10];
2719   mac[3] = ip->as_u8 [13];
2720   mac[4] = ip->as_u8 [14];
2721   mac[5] = ip->as_u8 [15];
2722 }
2723
2724 static clib_error_t *
2725 test_ip6_link_command_fn (vlib_main_t * vm,
2726                           unformat_input_t * input,
2727                           vlib_cli_command_t * cmd)
2728 {
2729   u8 mac[6];
2730   ip6_address_t _a, *a = &_a;
2731
2732   if (unformat (input, "%U", unformat_ethernet_address, mac))
2733     {
2734       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2735       vlib_cli_output (vm, "Link local address: %U",
2736                        format_ip6_address, a);
2737       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2738       vlib_cli_output (vm, "Original MAC address: %U",
2739                        format_ethernet_address, mac);
2740     }
2741
2742   return 0;
2743 }
2744
2745 /*?
2746  * This command converts the given MAC Address into an IPv6 link-local
2747  * address.
2748  *
2749  * @cliexpar
2750  * Example of how to create an IPv6 link-local address:
2751  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2752  * Link local address: fe80::14d9:e0ff:fe91:7986
2753  * Original MAC address: 16:d9:e0:91:79:86
2754  * @cliexend
2755 ?*/
2756 /* *INDENT-OFF* */
2757 VLIB_CLI_COMMAND (test_link_command, static) = {
2758   .path = "test ip6 link",
2759   .function = test_ip6_link_command_fn,
2760   .short_help = "test ip6 link <mac-address>",
2761 };
2762 /* *INDENT-ON* */
2763
2764 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2765 {
2766   ip6_main_t * im6 = &ip6_main;
2767   ip6_fib_t * fib;
2768   uword * p = hash_get (im6->fib_index_by_table_id, table_id);
2769
2770   if (p == 0)
2771     return -1;
2772
2773   fib = ip6_fib_get (p[0]);
2774
2775   fib->flow_hash_config = flow_hash_config;
2776   return 1;
2777 }
2778
2779 static clib_error_t *
2780 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2781                               unformat_input_t * input,
2782                               vlib_cli_command_t * cmd)
2783 {
2784   int matched = 0;
2785   u32 table_id = 0;
2786   u32 flow_hash_config = 0;
2787   int rv;
2788
2789   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
2790     if (unformat (input, "table %d", &table_id))
2791       matched = 1;
2792 #define _(a,v) \
2793     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2794     foreach_flow_hash_bit
2795 #undef _
2796     else break;
2797   }
2798
2799   if (matched == 0)
2800     return clib_error_return (0, "unknown input `%U'",
2801                               format_unformat_error, input);
2802
2803   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2804   switch (rv)
2805     {
2806     case 1:
2807       break;
2808
2809     case -1:
2810       return clib_error_return (0, "no such FIB table %d", table_id);
2811
2812     default:
2813       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2814       break;
2815     }
2816
2817   return 0;
2818 }
2819
2820 /*?
2821  * Configure the set of IPv6 fields used by the flow hash.
2822  *
2823  * @cliexpar
2824  * @parblock
2825  * Example of how to set the flow hash on a given table:
2826  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2827  *
2828  * Example of display the configured flow hash:
2829  * @cliexstart{show ip6 fib}
2830  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2831  * @::/0
2832  *   unicast-ip6-chain
2833  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2834  *     [0] [@0]: dpo-drop ip6
2835  * fe80::/10
2836  *   unicast-ip6-chain
2837  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2838  *     [0] [@2]: dpo-receive
2839  * ff02::1/128
2840  *   unicast-ip6-chain
2841  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2842  *     [0] [@2]: dpo-receive
2843  * ff02::2/128
2844  *   unicast-ip6-chain
2845  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2846  *     [0] [@2]: dpo-receive
2847  * ff02::16/128
2848  *   unicast-ip6-chain
2849  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2850  *     [0] [@2]: dpo-receive
2851  * ff02::1:ff00:0/104
2852  *   unicast-ip6-chain
2853  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2854  *     [0] [@2]: dpo-receive
2855  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2856  * @::/0
2857  *   unicast-ip6-chain
2858  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2859  *     [0] [@0]: dpo-drop ip6
2860  * @::a:1:1:0:4/126
2861  *   unicast-ip6-chain
2862  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2863  *     [0] [@4]: ipv6-glean: af_packet0
2864  * @::a:1:1:0:7/128
2865  *   unicast-ip6-chain
2866  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2867  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2868  * fe80::/10
2869  *   unicast-ip6-chain
2870  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2871  *     [0] [@2]: dpo-receive
2872  * fe80::fe:3eff:fe3e:9222/128
2873  *   unicast-ip6-chain
2874  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2875  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2876  * ff02::1/128
2877  *   unicast-ip6-chain
2878  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2879  *     [0] [@2]: dpo-receive
2880  * ff02::2/128
2881  *   unicast-ip6-chain
2882  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2883  *     [0] [@2]: dpo-receive
2884  * ff02::16/128
2885  *   unicast-ip6-chain
2886  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2887  *     [0] [@2]: dpo-receive
2888  * ff02::1:ff00:0/104
2889  *   unicast-ip6-chain
2890  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2891  *     [0] [@2]: dpo-receive
2892  * @cliexend
2893  * @endparblock
2894 ?*/
2895 /* *INDENT-OFF* */
2896 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
2897     .path = "set ip6 flow-hash",
2898     .short_help =
2899     "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2900     .function = set_ip6_flow_hash_command_fn,
2901 };
2902 /* *INDENT-ON* */
2903
2904 static clib_error_t *
2905 show_ip6_local_command_fn (vlib_main_t * vm,
2906                            unformat_input_t * input,
2907                            vlib_cli_command_t * cmd)
2908 {
2909   ip6_main_t * im = &ip6_main;
2910   ip_lookup_main_t * lm = &im->lookup_main;
2911   int i;
2912
2913   vlib_cli_output (vm, "Protocols handled by ip6_local");
2914   for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
2915     {
2916       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2917         vlib_cli_output (vm, "%d", i);
2918     }
2919   return 0;
2920 }
2921
2922
2923
2924 /*?
2925  * Display the set of protocols handled by the local IPv6 stack.
2926  *
2927  * @cliexpar
2928  * Example of how to display local protocol table:
2929  * @cliexstart{show ip6 local}
2930  * Protocols handled by ip6_local
2931  * 17
2932  * 43
2933  * 58
2934  * 115
2935  * @cliexend
2936 ?*/
2937 /* *INDENT-OFF* */
2938 VLIB_CLI_COMMAND (show_ip6_local, static) = {
2939   .path = "show ip6 local",
2940   .function = show_ip6_local_command_fn,
2941   .short_help = "show ip6 local",
2942 };
2943 /* *INDENT-ON* */
2944
2945 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2946                                  u32 table_index)
2947 {
2948   vnet_main_t * vnm = vnet_get_main();
2949   vnet_interface_main_t * im = &vnm->interface_main;
2950   ip6_main_t * ipm = &ip6_main;
2951   ip_lookup_main_t * lm = &ipm->lookup_main;
2952   vnet_classify_main_t * cm = &vnet_classify_main;
2953   ip6_address_t *if_addr;
2954
2955   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2956     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2957
2958   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2959     return VNET_API_ERROR_NO_SUCH_ENTRY;
2960
2961   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2962   lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
2963
2964   if_addr = ip6_interface_first_address (ipm, sw_if_index, NULL);
2965
2966   if (NULL != if_addr)
2967   {
2968       fib_prefix_t pfx = {
2969           .fp_len = 128,
2970           .fp_proto = FIB_PROTOCOL_IP6,
2971           .fp_addr.ip6 = *if_addr,
2972       };
2973       u32 fib_index;
2974
2975       fib_index = fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
2976                                                       sw_if_index);
2977
2978
2979       if (table_index != (u32) ~0)
2980       {
2981           dpo_id_t dpo = DPO_INVALID;
2982
2983           dpo_set(&dpo,
2984                   DPO_CLASSIFY,
2985                   DPO_PROTO_IP6,
2986                   classify_dpo_create(DPO_PROTO_IP6,
2987                                       table_index));
2988
2989           fib_table_entry_special_dpo_add(fib_index,
2990                                           &pfx,
2991                                           FIB_SOURCE_CLASSIFY,
2992                                           FIB_ENTRY_FLAG_NONE,
2993                                           &dpo);
2994           dpo_reset(&dpo);
2995       }
2996       else
2997       {
2998           fib_table_entry_special_remove(fib_index,
2999                                          &pfx,
3000                                          FIB_SOURCE_CLASSIFY);
3001       }
3002   }
3003
3004   return 0;
3005 }
3006
3007 static clib_error_t *
3008 set_ip6_classify_command_fn (vlib_main_t * vm,
3009                              unformat_input_t * input,
3010                              vlib_cli_command_t * cmd)
3011 {
3012   u32 table_index = ~0;
3013   int table_index_set = 0;
3014   u32 sw_if_index = ~0;
3015   int rv;
3016
3017   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3018     if (unformat (input, "table-index %d", &table_index))
3019       table_index_set = 1;
3020     else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3021                        vnet_get_main(), &sw_if_index))
3022         ;
3023     else
3024         break;
3025   }
3026
3027   if (table_index_set == 0)
3028       return clib_error_return (0, "classify table-index must be specified");
3029
3030   if (sw_if_index == ~0)
3031     return clib_error_return (0, "interface / subif must be specified");
3032
3033   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3034
3035   switch (rv)
3036     {
3037     case 0:
3038       break;
3039
3040     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3041       return clib_error_return (0, "No such interface");
3042
3043     case VNET_API_ERROR_NO_SUCH_ENTRY:
3044       return clib_error_return (0, "No such classifier table");
3045     }
3046   return 0;
3047 }
3048
3049 /*?
3050  * Assign a classification table to an interface. The classification
3051  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3052  * commands. Once the table is create, use this command to filter packets
3053  * on an interface.
3054  *
3055  * @cliexpar
3056  * Example of how to assign a classification table to an interface:
3057  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3058 ?*/
3059 /* *INDENT-OFF* */
3060 VLIB_CLI_COMMAND (set_ip6_classify_command, static) = {
3061     .path = "set ip6 classify",
3062     .short_help =
3063     "set ip6 classify intfc <interface> table-index <classify-idx>",
3064     .function = set_ip6_classify_command_fn,
3065 };
3066 /* *INDENT-ON* */
3067
3068 static clib_error_t *
3069 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3070 {
3071   ip6_main_t * im = &ip6_main;
3072   uword heapsize = 0;
3073   u32 tmp;
3074   u32 nbuckets = 0;
3075
3076   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3077     if (unformat (input, "hash-buckets %d", &tmp))
3078       nbuckets = tmp;
3079     else if (unformat (input, "heap-size %dm", &tmp))
3080       heapsize = ((u64)tmp) << 20;
3081     else if (unformat (input, "heap-size %dM", &tmp))
3082       heapsize = ((u64)tmp) << 20;
3083     else if (unformat (input, "heap-size %dg", &tmp))
3084       heapsize = ((u64)tmp) << 30;
3085     else if (unformat (input, "heap-size %dG", &tmp))
3086       heapsize = ((u64)tmp) << 30;
3087     else
3088       return clib_error_return (0, "unknown input '%U'",
3089                                 format_unformat_error, input);
3090   }
3091
3092   im->lookup_table_nbuckets = nbuckets;
3093   im->lookup_table_size = heapsize;
3094
3095   return 0;
3096 }
3097
3098 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");