src/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ip/ip_frag.h>
  43 #include <vnet/ip/ip6_neighbor.h>
  44 #include <vnet/ethernet/ethernet.h>     /* for ethernet_header_t */
  45 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  46 #include <vppinfra/cache.h>
  47 #include <vnet/fib/fib_urpf_list.h>     /* for FIB uRPF check */
  48 #include <vnet/fib/ip6_fib.h>
  49 #include <vnet/mfib/ip6_mfib.h>
  50 #include <vnet/dpo/load_balance_map.h>
  51 #include <vnet/dpo/classify_dpo.h>
  52
  53 #ifndef CLIB_MARCH_VARIANT
  54 #include <vppinfra/bihash_template.c>
  55 #endif
  56 #include <vnet/ip/ip6_forward.h>
  57 #include <vnet/interface_output.h>
  58
  59 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  60 #define OI_DECAP   0x80000000
  61
  62 static void
  63 ip6_add_interface_prefix_routes (ip6_main_t * im,
  64                                  u32 sw_if_index,
  65                                  u32 fib_index,
  66                                  ip6_address_t * address, u32 address_length)
  67 {
  68   ip_lookup_main_t *lm = &im->lookup_main;
  69   ip_interface_prefix_t *if_prefix;
  70
  71   /* *INDENT-OFF* */
  72   ip_interface_prefix_key_t key = {
  73     .prefix = {
  74       .fp_len = address_length,
  75       .fp_proto = FIB_PROTOCOL_IP6,
  76       .fp_addr.ip6 = {
  77         .as_u64 = {
  78           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
  79           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
  80         },
  81       },
  82     },
  83     .sw_if_index = sw_if_index,
  84   };
  85   /* *INDENT-ON* */
  86
  87   /* If prefix already set on interface, just increment ref count & return */
  88   if_prefix = ip_get_interface_prefix (lm, &key);
  89   if (if_prefix)
  90     {
  91       if_prefix->ref_count += 1;
  92       return;
  93     }
  94
  95   /* New prefix - allocate a pool entry, initialize it, add to the hash */
  96   pool_get (lm->if_prefix_pool, if_prefix);
  97   if_prefix->ref_count = 1;
  98   clib_memcpy (&if_prefix->key, &key, sizeof (key));
  99   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 100              if_prefix - lm->if_prefix_pool, 0 /* old value */ );
 101
 102   /* length < 128 - add glean */
 103   if (address_length < 128)
 104     {
 105       /* set the glean route for the prefix */
 106       fib_table_entry_update_one_path (fib_index, &key.prefix,
 107                                        FIB_SOURCE_INTERFACE,
 108                                        (FIB_ENTRY_FLAG_CONNECTED |
 109                                         FIB_ENTRY_FLAG_ATTACHED),
 110                                        DPO_PROTO_IP6,
 111                                        /* No next-hop address */
 112                                        NULL, sw_if_index,
 113                                        /* invalid FIB index */
 114                                        ~0, 1,
 115                                        /* no out-label stack */
 116                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
 117     }
 118 }
 119
 120 static void
 121 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 122                           ip6_main_t * im, u32 fib_index,
 123                           ip_interface_address_t * a)
 124 {
 125   ip_lookup_main_t *lm = &im->lookup_main;
 126   ip6_address_t *address = ip_interface_address_get_address (lm, a);
 127   fib_prefix_t pfx = {
 128     .fp_len = a->address_length,
 129     .fp_proto = FIB_PROTOCOL_IP6,
 130     .fp_addr.ip6 = *address,
 131   };
 132
 133   /* set special routes for the prefix if needed */
 134   ip6_add_interface_prefix_routes (im, sw_if_index, fib_index,
 135                                    address, a->address_length);
 136
 137   pfx.fp_len = 128;
 138   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 139     {
 140       u32 classify_table_index =
 141         lm->classify_table_index_by_sw_if_index[sw_if_index];
 142       if (classify_table_index != (u32) ~ 0)
 143         {
 144           dpo_id_t dpo = DPO_INVALID;
 145
 146           dpo_set (&dpo,
 147                    DPO_CLASSIFY,
 148                    DPO_PROTO_IP6,
 149                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 150
 151           fib_table_entry_special_dpo_add (fib_index,
 152                                            &pfx,
 153                                            FIB_SOURCE_CLASSIFY,
 154                                            FIB_ENTRY_FLAG_NONE, &dpo);
 155           dpo_reset (&dpo);
 156         }
 157     }
 158
 159   fib_table_entry_update_one_path (fib_index, &pfx,
 160                                    FIB_SOURCE_INTERFACE,
 161                                    (FIB_ENTRY_FLAG_CONNECTED |
 162                                     FIB_ENTRY_FLAG_LOCAL),
 163                                    DPO_PROTO_IP6,
 164                                    &pfx.fp_addr,
 165                                    sw_if_index, ~0,
 166                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 167 }
 168
 169 static void
 170 ip6_del_interface_prefix_routes (ip6_main_t * im,
 171                                  u32 sw_if_index,
 172                                  u32 fib_index,
 173                                  ip6_address_t * address, u32 address_length)
 174 {
 175   ip_lookup_main_t *lm = &im->lookup_main;
 176   ip_interface_prefix_t *if_prefix;
 177
 178   /* *INDENT-OFF* */
 179   ip_interface_prefix_key_t key = {
 180     .prefix = {
 181       .fp_len = address_length,
 182       .fp_proto = FIB_PROTOCOL_IP6,
 183       .fp_addr.ip6 = {
 184         .as_u64 = {
 185           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
 186           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
 187         },
 188       },
 189     },
 190     .sw_if_index = sw_if_index,
 191   };
 192   /* *INDENT-ON* */
 193
 194   if_prefix = ip_get_interface_prefix (lm, &key);
 195   if (!if_prefix)
 196     {
 197       clib_warning ("Prefix not found while deleting %U",
 198                     format_ip4_address_and_length, address, address_length);
 199       return;
 200     }
 201
 202   /* If not deleting last intf addr in prefix, decrement ref count & return */
 203   if_prefix->ref_count -= 1;
 204   if (if_prefix->ref_count > 0)
 205     return;
 206
 207   /* length <= 128, delete glean route */
 208   if (address_length <= 128)
 209     {
 210       /* remove glean route for prefix */
 211       fib_table_entry_delete (fib_index, &key.prefix, FIB_SOURCE_INTERFACE);
 212     }
 213
 214   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */ );
 215   pool_put (lm->if_prefix_pool, if_prefix);
 216 }
 217
 218 static void
 219 ip6_del_interface_routes (u32 sw_if_index, ip6_main_t * im,
 220                           u32 fib_index,
 221                           ip6_address_t * address, u32 address_length)
 222 {
 223   fib_prefix_t pfx = {
 224     .fp_len = 128,
 225     .fp_proto = FIB_PROTOCOL_IP6,
 226     .fp_addr.ip6 = *address,
 227   };
 228
 229   /* delete special routes for the prefix if needed */
 230   ip6_del_interface_prefix_routes (im, sw_if_index, fib_index,
 231                                    address, address_length);
 232
 233   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 234 }
 235
 236 #ifndef CLIB_MARCH_VARIANT
 237 void
 238 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 239 {
 240   ip6_main_t *im = &ip6_main;
 241
 242   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 243
 244   /*
 245    * enable/disable only on the 1<->0 transition
 246    */
 247   if (is_enable)
 248     {
 249       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 250         return;
 251     }
 252   else
 253     {
 254       /* The ref count is 0 when an address is removed from an interface that has
 255        * no address - this is not a ciritical error */
 256       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 257           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 258         return;
 259     }
 260
 261   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 262                                !is_enable, 0, 0);
 263
 264   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 265                                sw_if_index, !is_enable, 0, 0);
 266 }
 267
 268 /* get first interface address */
 269 ip6_address_t *
 270 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 271 {
 272   ip_lookup_main_t *lm = &im->lookup_main;
 273   ip_interface_address_t *ia = 0;
 274   ip6_address_t *result = 0;
 275
 276   /* *INDENT-OFF* */
 277   foreach_ip_interface_address (lm, ia, sw_if_index,
 278                                 1 /* honor unnumbered */,
 279   ({
 280     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 281     result = a;
 282     break;
 283   }));
 284   /* *INDENT-ON* */
 285   return result;
 286 }
 287
 288 clib_error_t *
 289 ip6_add_del_interface_address (vlib_main_t * vm,
 290                                u32 sw_if_index,
 291                                ip6_address_t * address,
 292                                u32 address_length, u32 is_del)
 293 {
 294   vnet_main_t *vnm = vnet_get_main ();
 295   ip6_main_t *im = &ip6_main;
 296   ip_lookup_main_t *lm = &im->lookup_main;
 297   clib_error_t *error;
 298   u32 if_address_index;
 299   ip6_address_fib_t ip6_af, *addr_fib = 0;
 300   ip6_address_t ll_addr;
 301
 302   /* local0 interface doesn't support IP addressing */
 303   if (sw_if_index == 0)
 304     {
 305       return
 306         clib_error_create ("local0 interface doesn't support IP addressing");
 307     }
 308
 309   if (ip6_address_is_link_local_unicast (address))
 310     {
 311       if (address_length != 128)
 312         {
 313           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 314           return
 315             clib_error_create
 316             ("prefix length of link-local address must be 128");
 317         }
 318       if (!is_del)
 319         {
 320           return ip6_neighbor_set_link_local_address (vm, sw_if_index,
 321                                                       address);
 322         }
 323       else
 324         {
 325           ll_addr = ip6_neighbor_get_link_local_address (sw_if_index);
 326           if (ip6_address_is_equal (&ll_addr, address))
 327             {
 328               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 329               return clib_error_create ("address not deletable");
 330             }
 331           else
 332             {
 333               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 334               return clib_error_create ("address not found");
 335             }
 336         }
 337     }
 338
 339   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 340   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 341
 342   ip6_addr_fib_init (&ip6_af, address,
 343                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 344   vec_add1 (addr_fib, ip6_af);
 345
 346   /* *INDENT-OFF* */
 347   if (!is_del)
 348     {
 349       /* When adding an address check that it does not conflict
 350          with an existing address on any interface in this table. */
 351       ip_interface_address_t *ia;
 352       vnet_sw_interface_t *sif;
 353
 354       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 355       ({
 356           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 357               im->fib_index_by_sw_if_index[sif->sw_if_index])
 358             {
 359               foreach_ip_interface_address
 360                 (&im->lookup_main, ia, sif->sw_if_index,
 361                  0 /* honor unnumbered */ ,
 362                  ({
 363                    ip6_address_t * x =
 364                      ip_interface_address_get_address
 365                      (&im->lookup_main, ia);
 366                    if (ip6_destination_matches_route
 367                        (im, address, x, ia->address_length) ||
 368                        ip6_destination_matches_route (im,
 369                                                       x,
 370                                                       address,
 371                                                       address_length))
 372                      {
 373                        /* an intf may have >1 addr from the same prefix */
 374                        if ((sw_if_index == sif->sw_if_index) &&
 375                            (ia->address_length == address_length) &&
 376                            !ip6_address_is_equal (x, address))
 377                          continue;
 378
 379                        /* error if the length or intf was different */
 380                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 381                        return
 382                          clib_error_create
 383                          ("failed to add %U which conflicts with %U for interface %U",
 384                           format_ip6_address_and_length, address,
 385                           address_length,
 386                           format_ip6_address_and_length, x,
 387                           ia->address_length,
 388                           format_vnet_sw_if_index_name, vnm,
 389                           sif->sw_if_index);
 390                      }
 391                  }));
 392             }
 393       }));
 394     }
 395   /* *INDENT-ON* */
 396
 397   {
 398     uword elts_before = pool_elts (lm->if_address_pool);
 399
 400     error = ip_interface_address_add_del
 401       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 402     if (error)
 403       goto done;
 404
 405     /* Pool did not grow: add duplicate address. */
 406     if (elts_before == pool_elts (lm->if_address_pool))
 407       goto done;
 408   }
 409
 410   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 411
 412   /* intf addr routes are added/deleted on admin up/down */
 413   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 414     {
 415       if (is_del)
 416         ip6_del_interface_routes (sw_if_index,
 417                                   im, ip6_af.fib_index, address,
 418                                   address_length);
 419       else
 420         ip6_add_interface_routes (vnm, sw_if_index,
 421                                   im, ip6_af.fib_index,
 422                                   pool_elt_at_index (lm->if_address_pool,
 423                                                      if_address_index));
 424     }
 425   {
 426     ip6_add_del_interface_address_callback_t *cb;
 427     vec_foreach (cb, im->add_del_interface_address_callbacks)
 428       cb->function (im, cb->function_opaque, sw_if_index,
 429                     address, address_length, if_address_index, is_del);
 430   }
 431
 432 done:
 433   vec_free (addr_fib);
 434   return error;
 435 }
 436
 437 #endif
 438
 439 static clib_error_t *
 440 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 441 {
 442   ip6_main_t *im = &ip6_main;
 443   ip_interface_address_t *ia;
 444   ip6_address_t *a;
 445   u32 is_admin_up, fib_index;
 446
 447   /* Fill in lookup tables with default table (0). */
 448   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 449
 450   vec_validate_init_empty (im->
 451                            lookup_main.if_address_pool_index_by_sw_if_index,
 452                            sw_if_index, ~0);
 453
 454   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 455
 456   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 457
 458   /* *INDENT-OFF* */
 459   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 460                                 0 /* honor unnumbered */,
 461   ({
 462     a = ip_interface_address_get_address (&im->lookup_main, ia);
 463     if (is_admin_up)
 464       ip6_add_interface_routes (vnm, sw_if_index,
 465                                 im, fib_index,
 466                                 ia);
 467     else
 468       ip6_del_interface_routes (sw_if_index, im, fib_index,
 469                                 a, ia->address_length);
 470   }));
 471   /* *INDENT-ON* */
 472
 473   return 0;
 474 }
 475
 476 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 477
 478 /* Built-in ip6 unicast rx feature path definition */
 479 /* *INDENT-OFF* */
 480 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 481 {
 482   .arc_name  = "ip6-unicast",
 483   .start_nodes = VNET_FEATURES ("ip6-input"),
 484   .last_in_arc = "ip6-lookup",
 485   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 486 };
 487
 488 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 489 {
 490   .arc_name = "ip6-unicast",
 491   .node_name = "ip6-flow-classify",
 492   .runs_before = VNET_FEATURES ("ip6-inacl"),
 493 };
 494
 495 VNET_FEATURE_INIT (ip6_inacl, static) =
 496 {
 497   .arc_name = "ip6-unicast",
 498   .node_name = "ip6-inacl",
 499   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 500 };
 501
 502 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 503 {
 504   .arc_name = "ip6-unicast",
 505   .node_name = "ip6-policer-classify",
 506   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 507 };
 508
 509 VNET_FEATURE_INIT (ip6_ipsec, static) =
 510 {
 511   .arc_name = "ip6-unicast",
 512   .node_name = "ipsec6-input-feature",
 513   .runs_before = VNET_FEATURES ("l2tp-decap"),
 514 };
 515
 516 VNET_FEATURE_INIT (ip6_l2tp, static) =
 517 {
 518   .arc_name = "ip6-unicast",
 519   .node_name = "l2tp-decap",
 520   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 521 };
 522
 523 VNET_FEATURE_INIT (ip6_vpath, static) =
 524 {
 525   .arc_name = "ip6-unicast",
 526   .node_name = "vpath-input-ip6",
 527   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 528 };
 529
 530 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 531 {
 532   .arc_name = "ip6-unicast",
 533   .node_name = "ip6-vxlan-bypass",
 534   .runs_before = VNET_FEATURES ("ip6-lookup"),
 535 };
 536
 537 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 538 {
 539   .arc_name = "ip6-unicast",
 540   .node_name = "ip6-not-enabled",
 541   .runs_before = VNET_FEATURES ("ip6-lookup"),
 542 };
 543
 544 VNET_FEATURE_INIT (ip6_lookup, static) =
 545 {
 546   .arc_name = "ip6-unicast",
 547   .node_name = "ip6-lookup",
 548   .runs_before = 0,  /*last feature*/
 549 };
 550
 551 /* Built-in ip6 multicast rx feature path definition (none now) */
 552 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 553 {
 554   .arc_name  = "ip6-multicast",
 555   .start_nodes = VNET_FEATURES ("ip6-input"),
 556   .last_in_arc = "ip6-mfib-forward-lookup",
 557   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 558 };
 559
 560 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 561   .arc_name = "ip6-multicast",
 562   .node_name = "vpath-input-ip6",
 563   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 564 };
 565
 566 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 567   .arc_name = "ip6-multicast",
 568   .node_name = "ip6-not-enabled",
 569   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 570 };
 571
 572 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 573   .arc_name = "ip6-multicast",
 574   .node_name = "ip6-mfib-forward-lookup",
 575   .runs_before = 0, /* last feature */
 576 };
 577
 578 /* Built-in ip4 tx feature path definition */
 579 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 580 {
 581   .arc_name  = "ip6-output",
 582   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 583   .last_in_arc = "interface-output",
 584   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 585 };
 586
 587 VNET_FEATURE_INIT (ip6_outacl, static) = {
 588   .arc_name = "ip6-output",
 589   .node_name = "ip6-outacl",
 590   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 591 };
 592
 593 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 594   .arc_name = "ip6-output",
 595   .node_name = "ipsec6-output-feature",
 596   .runs_before = VNET_FEATURES ("interface-output"),
 597 };
 598
 599 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 600   .arc_name = "ip6-output",
 601   .node_name = "interface-output",
 602   .runs_before = 0, /* not before any other features */
 603 };
 604 /* *INDENT-ON* */
 605
 606 static clib_error_t *
 607 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 608 {
 609   ip6_main_t *im = &ip6_main;
 610
 611   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 612   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 613
 614   if (!is_add)
 615     {
 616       /* Ensure that IPv6 is disabled */
 617       ip6_main_t *im6 = &ip6_main;
 618       ip_lookup_main_t *lm6 = &im6->lookup_main;
 619       ip_interface_address_t *ia = 0;
 620       ip6_address_t *address;
 621       vlib_main_t *vm = vlib_get_main ();
 622
 623       ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ );
 624       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 625       /* *INDENT-OFF* */
 626       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 627       ({
 628         address = ip_interface_address_get_address (lm6, ia);
 629         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 630       }));
 631       /* *INDENT-ON* */
 632       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 633     }
 634
 635   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 636                                is_add, 0, 0);
 637
 638   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 639                                sw_if_index, is_add, 0, 0);
 640
 641   return /* no error */ 0;
 642 }
 643
 644 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 645
 646 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 647                                 vlib_node_runtime_t * node,
 648                                 vlib_frame_t * frame)
 649 {
 650   return ip6_lookup_inline (vm, node, frame);
 651 }
 652
 653 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 654
 655 /* *INDENT-OFF* */
 656 VLIB_REGISTER_NODE (ip6_lookup_node) =
 657 {
 658   .name = "ip6-lookup",
 659   .vector_size = sizeof (u32),
 660   .format_trace = format_ip6_lookup_trace,
 661   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 662   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 663 };
 664 /* *INDENT-ON* */
 665
 666 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 667                                       vlib_node_runtime_t * node,
 668                                       vlib_frame_t * frame)
 669 {
 670   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 671   u32 n_left, *from;
 672   u32 thread_index = vm->thread_index;
 673   ip6_main_t *im = &ip6_main;
 674   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 675   u16 nexts[VLIB_FRAME_SIZE], *next;
 676
 677   from = vlib_frame_vector_args (frame);
 678   n_left = frame->n_vectors;
 679   next = nexts;
 680
 681   vlib_get_buffers (vm, from, bufs, n_left);
 682
 683   while (n_left >= 4)
 684     {
 685       const load_balance_t *lb0, *lb1;
 686       const ip6_header_t *ip0, *ip1;
 687       u32 lbi0, hc0, lbi1, hc1;
 688       const dpo_id_t *dpo0, *dpo1;
 689
 690       /* Prefetch next iteration. */
 691       {
 692         vlib_prefetch_buffer_header (b[2], STORE);
 693         vlib_prefetch_buffer_header (b[3], STORE);
 694
 695         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 696         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 697       }
 698
 699       ip0 = vlib_buffer_get_current (b[0]);
 700       ip1 = vlib_buffer_get_current (b[1]);
 701       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 702       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 703
 704       lb0 = load_balance_get (lbi0);
 705       lb1 = load_balance_get (lbi1);
 706
 707       /*
 708        * this node is for via FIBs we can re-use the hash value from the
 709        * to node if present.
 710        * We don't want to use the same hash value at each level in the recursion
 711        * graph as that would lead to polarisation
 712        */
 713       hc0 = hc1 = 0;
 714
 715       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 716         {
 717           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 718             {
 719               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 720                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 721             }
 722           else
 723             {
 724               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 725                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 726             }
 727           dpo0 = load_balance_get_fwd_bucket
 728             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 729         }
 730       else
 731         {
 732           dpo0 = load_balance_get_bucket_i (lb0, 0);
 733         }
 734       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 735         {
 736           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 737             {
 738               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 739                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 740             }
 741           else
 742             {
 743               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 744                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 745             }
 746           dpo1 = load_balance_get_fwd_bucket
 747             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 748         }
 749       else
 750         {
 751           dpo1 = load_balance_get_bucket_i (lb1, 0);
 752         }
 753
 754       next[0] = dpo0->dpoi_next_node;
 755       next[1] = dpo1->dpoi_next_node;
 756
 757       /* Only process the HBH Option Header if explicitly configured to do so */
 758       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 759         {
 760           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 761             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 762         }
 763       /* Only process the HBH Option Header if explicitly configured to do so */
 764       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 765         {
 766           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 767             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 768         }
 769
 770       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 771       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 772
 773       vlib_increment_combined_counter
 774         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 775       vlib_increment_combined_counter
 776         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 777
 778       b += 2;
 779       next += 2;
 780       n_left -= 2;
 781     }
 782
 783   while (n_left > 0)
 784     {
 785       const load_balance_t *lb0;
 786       const ip6_header_t *ip0;
 787       const dpo_id_t *dpo0;
 788       u32 lbi0, hc0;
 789
 790       ip0 = vlib_buffer_get_current (b[0]);
 791       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 792
 793       lb0 = load_balance_get (lbi0);
 794
 795       hc0 = 0;
 796       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 797         {
 798           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 799             {
 800               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 801                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 802             }
 803           else
 804             {
 805               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 806                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 807             }
 808           dpo0 = load_balance_get_fwd_bucket
 809             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 810         }
 811       else
 812         {
 813           dpo0 = load_balance_get_bucket_i (lb0, 0);
 814         }
 815
 816       next[0] = dpo0->dpoi_next_node;
 817       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 818
 819       /* Only process the HBH Option Header if explicitly configured to do so */
 820       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 821         {
 822           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 823             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 824         }
 825
 826       vlib_increment_combined_counter
 827         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 828
 829       b += 1;
 830       next += 1;
 831       n_left -= 1;
 832     }
 833
 834   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 835
 836   if (node->flags & VLIB_NODE_FLAG_TRACE)
 837     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 838
 839   return frame->n_vectors;
 840 }
 841
 842 /* *INDENT-OFF* */
 843 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 844 {
 845   .name = "ip6-load-balance",
 846   .vector_size = sizeof (u32),
 847   .sibling_of = "ip6-lookup",
 848   .format_trace = format_ip6_lookup_trace,
 849 };
 850 /* *INDENT-ON* */
 851
 852 typedef struct
 853 {
 854   /* Adjacency taken. */
 855   u32 adj_index;
 856   u32 flow_hash;
 857   u32 fib_index;
 858
 859   /* Packet data, possibly *after* rewrite. */
 860   u8 packet_data[128 - 1 * sizeof (u32)];
 861 }
 862 ip6_forward_next_trace_t;
 863
 864 #ifndef CLIB_MARCH_VARIANT
 865 u8 *
 866 format_ip6_forward_next_trace (u8 * s, va_list * args)
 867 {
 868   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 869   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 870   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 871   u32 indent = format_get_indent (s);
 872
 873   s = format (s, "%U%U",
 874               format_white_space, indent,
 875               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 876   return s;
 877 }
 878 #endif
 879
 880 static u8 *
 881 format_ip6_lookup_trace (u8 * s, va_list * args)
 882 {
 883   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 884   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 885   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 886   u32 indent = format_get_indent (s);
 887
 888   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 889               t->fib_index, t->adj_index, t->flow_hash);
 890   s = format (s, "\n%U%U",
 891               format_white_space, indent,
 892               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 893   return s;
 894 }
 895
 896
 897 static u8 *
 898 format_ip6_rewrite_trace (u8 * s, va_list * args)
 899 {
 900   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 901   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 902   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 903   u32 indent = format_get_indent (s);
 904
 905   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 906               t->fib_index, t->adj_index, format_ip_adjacency,
 907               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 908   s = format (s, "\n%U%U",
 909               format_white_space, indent,
 910               format_ip_adjacency_packet_data,
 911               t->packet_data, sizeof (t->packet_data));
 912   return s;
 913 }
 914
 915 /* Common trace function for all ip6-forward next nodes. */
 916 #ifndef CLIB_MARCH_VARIANT
 917 void
 918 ip6_forward_next_trace (vlib_main_t * vm,
 919                         vlib_node_runtime_t * node,
 920                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 921 {
 922   u32 *from, n_left;
 923   ip6_main_t *im = &ip6_main;
 924
 925   n_left = frame->n_vectors;
 926   from = vlib_frame_vector_args (frame);
 927
 928   while (n_left >= 4)
 929     {
 930       u32 bi0, bi1;
 931       vlib_buffer_t *b0, *b1;
 932       ip6_forward_next_trace_t *t0, *t1;
 933
 934       /* Prefetch next iteration. */
 935       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 936       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 937
 938       bi0 = from[0];
 939       bi1 = from[1];
 940
 941       b0 = vlib_get_buffer (vm, bi0);
 942       b1 = vlib_get_buffer (vm, bi1);
 943
 944       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 945         {
 946           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 947           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 948           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 949           t0->fib_index =
 950             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 951              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 952             vec_elt (im->fib_index_by_sw_if_index,
 953                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 954
 955           clib_memcpy_fast (t0->packet_data,
 956                             vlib_buffer_get_current (b0),
 957                             sizeof (t0->packet_data));
 958         }
 959       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 960         {
 961           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 962           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 963           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 964           t1->fib_index =
 965             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 966              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 967             vec_elt (im->fib_index_by_sw_if_index,
 968                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 969
 970           clib_memcpy_fast (t1->packet_data,
 971                             vlib_buffer_get_current (b1),
 972                             sizeof (t1->packet_data));
 973         }
 974       from += 2;
 975       n_left -= 2;
 976     }
 977
 978   while (n_left >= 1)
 979     {
 980       u32 bi0;
 981       vlib_buffer_t *b0;
 982       ip6_forward_next_trace_t *t0;
 983
 984       bi0 = from[0];
 985
 986       b0 = vlib_get_buffer (vm, bi0);
 987
 988       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 989         {
 990           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 991           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 992           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 993           t0->fib_index =
 994             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 995              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 996             vec_elt (im->fib_index_by_sw_if_index,
 997                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 998
 999           clib_memcpy_fast (t0->packet_data,
1000                             vlib_buffer_get_current (b0),
1001                             sizeof (t0->packet_data));
1002         }
1003       from += 1;
1004       n_left -= 1;
1005     }
1006 }
1007
1008 /* Compute TCP/UDP/ICMP6 checksum in software. */
1009 u16
1010 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1011                                    ip6_header_t * ip0, int *bogus_lengthp)
1012 {
1013   ip_csum_t sum0;
1014   u16 payload_length_host_byte_order;
1015   u32 i;
1016   u32 headers_size = sizeof (ip0[0]);
1017   u8 *data_this_buffer;
1018
1019   ASSERT (bogus_lengthp);
1020   *bogus_lengthp = 0;
1021
1022   /* Initialize checksum with ip header. */
1023   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1024   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1025   data_this_buffer = (u8 *) (ip0 + 1);
1026
1027   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1028     {
1029       sum0 = ip_csum_with_carry
1030         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1031       sum0 = ip_csum_with_carry
1032         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1033     }
1034
1035   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1036    * or UDP-Ping packets */
1037   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1038     {
1039       u32 skip_bytes;
1040       ip6_hop_by_hop_ext_t *ext_hdr =
1041         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1042
1043       /* validate really icmp6 next */
1044       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1045               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1046
1047       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1048       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1049
1050       payload_length_host_byte_order -= skip_bytes;
1051       headers_size += skip_bytes;
1052     }
1053
1054   if (p0)
1055     return ip_calculate_l4_checksum (vm, p0, sum0,
1056                                      payload_length_host_byte_order,
1057                                      (u8 *) ip0, headers_size, NULL);
1058   else
1059     return ip_calculate_l4_checksum (vm, 0, sum0,
1060                                      payload_length_host_byte_order, NULL, 0,
1061                                      data_this_buffer);
1062 }
1063
1064 u32
1065 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1066 {
1067   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1068   udp_header_t *udp0;
1069   u16 sum16;
1070   int bogus_length;
1071
1072   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1073   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1074           || ip0->protocol == IP_PROTOCOL_ICMP6
1075           || ip0->protocol == IP_PROTOCOL_UDP
1076           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1077
1078   udp0 = (void *) (ip0 + 1);
1079   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1080     {
1081       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1082                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1083       return p0->flags;
1084     }
1085
1086   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1087
1088   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1089                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1090
1091   return p0->flags;
1092 }
1093 #endif
1094
1095 /**
1096  * @brief returns number of links on which src is reachable.
1097  */
1098 always_inline int
1099 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1100 {
1101   const load_balance_t *lb0;
1102   index_t lbi;
1103   u32 fib_index;
1104
1105   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1106                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1107   fib_index =
1108     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1109     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1110
1111   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1112   lb0 = load_balance_get (lbi);
1113
1114   return (fib_urpf_check_size (lb0->lb_urpf));
1115 }
1116
1117 always_inline u8
1118 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1119                            u32 * udp_offset0)
1120 {
1121   u32 proto0;
1122   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1123   if (proto0 != IP_PROTOCOL_UDP)
1124     {
1125       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1126       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1127     }
1128   return proto0;
1129 }
1130
1131 /* *INDENT-OFF* */
1132 VNET_FEATURE_ARC_INIT (ip6_local) =
1133 {
1134   .arc_name  = "ip6-local",
1135   .start_nodes = VNET_FEATURES ("ip6-local"),
1136 };
1137 /* *INDENT-ON* */
1138
1139 always_inline uword
1140 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1141                   vlib_frame_t * frame, int head_of_feature_arc)
1142 {
1143   ip6_main_t *im = &ip6_main;
1144   ip_lookup_main_t *lm = &im->lookup_main;
1145   u32 *from, n_left_from;
1146   vlib_node_runtime_t *error_node =
1147     vlib_node_get_runtime (vm, ip6_input_node.index);
1148   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1149   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1150   u16 nexts[VLIB_FRAME_SIZE], *next;
1151
1152   from = vlib_frame_vector_args (frame);
1153   n_left_from = frame->n_vectors;
1154
1155   if (node->flags & VLIB_NODE_FLAG_TRACE)
1156     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1157
1158   vlib_get_buffers (vm, from, bufs, n_left_from);
1159   b = bufs;
1160   next = nexts;
1161
1162   while (n_left_from > 2)
1163     {
1164       /* Prefetch next iteration. */
1165       if (n_left_from >= 6)
1166         {
1167           vlib_prefetch_buffer_header (b[4], STORE);
1168           vlib_prefetch_buffer_header (b[5], STORE);
1169           vlib_prefetch_buffer_data (b[2], LOAD);
1170           vlib_prefetch_buffer_data (b[3], LOAD);
1171         }
1172
1173       u8 error[2];
1174       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1175       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1176
1177       ip6_header_t *ip[2];
1178       ip[0] = vlib_buffer_get_current (b[0]);
1179       ip[1] = vlib_buffer_get_current (b[1]);
1180
1181       if (head_of_feature_arc)
1182         {
1183           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1184           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1185
1186           u8 type[2];
1187           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1188           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1189
1190           u32 flags[2];
1191           flags[0] = b[0]->flags;
1192           flags[1] = b[1]->flags;
1193
1194           u32 good_l4_csum[2];
1195           good_l4_csum[0] =
1196             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1197                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1198                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1199           good_l4_csum[1] =
1200             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1201                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1202                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1203
1204           u32 udp_offset[2] = { };
1205           u8 is_tcp_udp[2];
1206           is_tcp_udp[0] =
1207             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1208           is_tcp_udp[1] =
1209             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1210           i16 len_diff[2] = { 0 };
1211           if (PREDICT_TRUE (is_tcp_udp[0]))
1212             {
1213               udp_header_t *udp =
1214                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1215               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1216                 && udp->checksum == 0;
1217               /* optimistically verify UDP length. */
1218               u16 ip_len, udp_len;
1219               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1220               udp_len = clib_net_to_host_u16 (udp->length);
1221               len_diff[0] = ip_len - udp_len;
1222             }
1223           if (PREDICT_TRUE (is_tcp_udp[1]))
1224             {
1225               udp_header_t *udp =
1226                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1227               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1228                 && udp->checksum == 0;
1229               /* optimistically verify UDP length. */
1230               u16 ip_len, udp_len;
1231               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1232               udp_len = clib_net_to_host_u16 (udp->length);
1233               len_diff[1] = ip_len - udp_len;
1234             }
1235
1236           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1237           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1238
1239           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1240           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1241
1242           u8 need_csum[2];
1243           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1244             && !good_l4_csum[0]
1245             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1246           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1247             && !good_l4_csum[1]
1248             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1249           if (PREDICT_FALSE (need_csum[0]))
1250             {
1251               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1252               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1253             }
1254           if (PREDICT_FALSE (need_csum[1]))
1255             {
1256               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1257               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1258             }
1259
1260           error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1261           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1262           error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1263           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1264
1265           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1266                          IP6_ERROR_UDP_CHECKSUM,
1267                          "Wrong IP6 errors constants");
1268           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1269                          IP6_ERROR_ICMP_CHECKSUM,
1270                          "Wrong IP6 errors constants");
1271
1272           error[0] =
1273             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1274           error[1] =
1275             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1276
1277           /* Drop packets from unroutable hosts. */
1278           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1279           u8 unroutable[2];
1280           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1281             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1282             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1283           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1284             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1285             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1286           if (PREDICT_FALSE (unroutable[0]))
1287             {
1288               error[0] =
1289                 !ip6_urpf_loose_check (im, b[0],
1290                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1291                 : error[0];
1292             }
1293           if (PREDICT_FALSE (unroutable[1]))
1294             {
1295               error[1] =
1296                 !ip6_urpf_loose_check (im, b[1],
1297                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1298                 : error[1];
1299             }
1300
1301           vnet_buffer (b[0])->ip.fib_index =
1302             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1303             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1304             vnet_buffer (b[0])->ip.fib_index;
1305           vnet_buffer (b[1])->ip.fib_index =
1306             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1307             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1308             vnet_buffer (b[1])->ip.fib_index;
1309         }                       /* head_of_feature_arc */
1310
1311       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1312       next[0] =
1313         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1314       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1315       next[1] =
1316         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1317
1318       b[0]->error = error_node->errors[0];
1319       b[1]->error = error_node->errors[1];
1320
1321       if (head_of_feature_arc)
1322         {
1323           u8 ip6_unknown[2];
1324           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1325           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1326           if (PREDICT_TRUE (ip6_unknown[0]))
1327             {
1328               u32 next32 = next[0];
1329               vnet_feature_arc_start (arc_index,
1330                                       vnet_buffer (b[0])->sw_if_index
1331                                       [VLIB_RX], &next32, b[0]);
1332               next[0] = next32;
1333             }
1334           if (PREDICT_TRUE (ip6_unknown[1]))
1335             {
1336               u32 next32 = next[1];
1337               vnet_feature_arc_start (arc_index,
1338                                       vnet_buffer (b[1])->sw_if_index
1339                                       [VLIB_RX], &next32, b[1]);
1340               next[1] = next32;
1341             }
1342         }
1343
1344       /* next */
1345       b += 2;
1346       next += 2;
1347       n_left_from -= 2;
1348     }
1349
1350   while (n_left_from)
1351     {
1352       u8 error;
1353       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1354
1355       ip6_header_t *ip;
1356       ip = vlib_buffer_get_current (b[0]);
1357
1358       if (head_of_feature_arc)
1359         {
1360           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1361           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1362
1363           u32 flags = b[0]->flags;
1364           u32 good_l4_csum =
1365             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1366                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1367                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1368
1369           u32 udp_offset;
1370           i16 len_diff = 0;
1371           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1372           if (PREDICT_TRUE (is_tcp_udp))
1373             {
1374               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1375               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1376               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1377                 && udp->checksum == 0;
1378               /* optimistically verify UDP length. */
1379               u16 ip_len, udp_len;
1380               ip_len = clib_net_to_host_u16 (ip->payload_length);
1381               udp_len = clib_net_to_host_u16 (udp->length);
1382               len_diff = ip_len - udp_len;
1383             }
1384
1385           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1386           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1387
1388           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1389             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1390           if (PREDICT_FALSE (need_csum))
1391             {
1392               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1393               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1394             }
1395
1396           error = IP6_ERROR_UNKNOWN_PROTOCOL;
1397           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1398
1399           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1400                          IP6_ERROR_UDP_CHECKSUM,
1401                          "Wrong IP6 errors constants");
1402           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1403                          IP6_ERROR_ICMP_CHECKSUM,
1404                          "Wrong IP6 errors constants");
1405
1406           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1407
1408           /* Drop packets from unroutable hosts. */
1409           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1410           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1411             && type != IP_BUILTIN_PROTOCOL_ICMP
1412             && !ip6_address_is_link_local_unicast (&ip->src_address);
1413           if (PREDICT_FALSE (unroutable))
1414             {
1415               error =
1416                 !ip6_urpf_loose_check (im, b[0],
1417                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1418                 error;
1419             }
1420
1421           vnet_buffer (b[0])->ip.fib_index =
1422             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1423             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1424             vnet_buffer (b[0])->ip.fib_index;
1425         }                       /* head_of_feature_arc */
1426
1427       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1428       next[0] =
1429         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1430
1431       b[0]->error = error_node->errors[0];
1432
1433       if (head_of_feature_arc)
1434         {
1435           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1436             {
1437               u32 next32 = next[0];
1438               vnet_feature_arc_start (arc_index,
1439                                       vnet_buffer (b[0])->sw_if_index
1440                                       [VLIB_RX], &next32, b[0]);
1441               next[0] = next32;
1442             }
1443         }
1444
1445       /* next */
1446       b += 1;
1447       next += 1;
1448       n_left_from -= 1;
1449     }
1450
1451   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1452   return frame->n_vectors;
1453 }
1454
1455 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1456                                vlib_frame_t * frame)
1457 {
1458   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1459 }
1460
1461 /* *INDENT-OFF* */
1462 VLIB_REGISTER_NODE (ip6_local_node) =
1463 {
1464   .name = "ip6-local",
1465   .vector_size = sizeof (u32),
1466   .format_trace = format_ip6_forward_next_trace,
1467   .n_next_nodes = IP_LOCAL_N_NEXT,
1468   .next_nodes =
1469   {
1470     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1471     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1472     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1473     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1474     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1475   },
1476 };
1477 /* *INDENT-ON* */
1478
1479 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1480                                           vlib_node_runtime_t * node,
1481                                           vlib_frame_t * frame)
1482 {
1483   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1484 }
1485
1486 /* *INDENT-OFF* */
1487 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1488   .name = "ip6-local-end-of-arc",
1489   .vector_size = sizeof (u32),
1490
1491   .format_trace = format_ip6_forward_next_trace,
1492   .sibling_of = "ip6-local",
1493 };
1494
1495 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1496   .arc_name = "ip6-local",
1497   .node_name = "ip6-local-end-of-arc",
1498   .runs_before = 0, /* not before any other features */
1499 };
1500 /* *INDENT-ON* */
1501
1502 #ifdef CLIB_MARCH_VARIANT
1503 extern vlib_node_registration_t ip6_local_node;
1504
1505 #else
1506
1507 void
1508 ip6_register_protocol (u32 protocol, u32 node_index)
1509 {
1510   vlib_main_t *vm = vlib_get_main ();
1511   ip6_main_t *im = &ip6_main;
1512   ip_lookup_main_t *lm = &im->lookup_main;
1513
1514   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1515   lm->local_next_by_ip_protocol[protocol] =
1516     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1517 }
1518
1519 void
1520 ip6_unregister_protocol (u32 protocol)
1521 {
1522   ip6_main_t *im = &ip6_main;
1523   ip_lookup_main_t *lm = &im->lookup_main;
1524
1525   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1526   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1527 }
1528
1529 clib_error_t *
1530 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1531                     u8 refresh)
1532 {
1533   vnet_main_t *vnm = vnet_get_main ();
1534   ip6_main_t *im = &ip6_main;
1535   icmp6_neighbor_solicitation_header_t *h;
1536   ip6_address_t *src;
1537   ip_interface_address_t *ia;
1538   ip_adjacency_t *adj;
1539   vnet_hw_interface_t *hi;
1540   vnet_sw_interface_t *si;
1541   vlib_buffer_t *b;
1542   adj_index_t ai;
1543   u32 bi = 0;
1544   int bogus_length;
1545
1546   si = vnet_get_sw_interface (vnm, sw_if_index);
1547
1548   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1549     {
1550       return clib_error_return (0, "%U: interface %U down",
1551                                 format_ip6_address, dst,
1552                                 format_vnet_sw_if_index_name, vnm,
1553                                 sw_if_index);
1554     }
1555
1556   src =
1557     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1558   if (!src)
1559     {
1560       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1561       return clib_error_return
1562         (0, "no matching interface address for destination %U (interface %U)",
1563          format_ip6_address, dst,
1564          format_vnet_sw_if_index_name, vnm, sw_if_index);
1565     }
1566
1567   h =
1568     vlib_packet_template_get_packet (vm,
1569                                      &im->discover_neighbor_packet_template,
1570                                      &bi);
1571   if (!h)
1572     return clib_error_return (0, "ICMP6 NS packet allocation failed");
1573
1574   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1575
1576   /* Destination address is a solicited node multicast address.  We need to fill in
1577      the low 24 bits with low 24 bits of target's address. */
1578   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1579   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1580   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1581
1582   h->ip.src_address = src[0];
1583   h->neighbor.target_address = dst[0];
1584
1585   if (PREDICT_FALSE (!hi->hw_address))
1586     {
1587       return clib_error_return (0, "%U: interface %U do not support ip probe",
1588                                 format_ip6_address, dst,
1589                                 format_vnet_sw_if_index_name, vnm,
1590                                 sw_if_index);
1591     }
1592
1593   clib_memcpy_fast (h->link_layer_option.ethernet_address, hi->hw_address,
1594                     vec_len (hi->hw_address));
1595
1596   h->neighbor.icmp.checksum =
1597     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1598   ASSERT (bogus_length == 0);
1599
1600   b = vlib_get_buffer (vm, bi);
1601   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1602     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1603
1604   /* Add encapsulation string for software interface (e.g. ethernet header). */
1605   ip46_address_t nh = {
1606     .ip6 = *dst,
1607   };
1608
1609   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1610                             VNET_LINK_IP6, &nh, sw_if_index);
1611   adj = adj_get (ai);
1612
1613   /* Peer has been previously resolved, retrieve glean adj instead */
1614   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1615     {
1616       adj_unlock (ai);
1617       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1618                                   VNET_LINK_IP6, sw_if_index, &nh);
1619       adj = adj_get (ai);
1620     }
1621
1622   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1623   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1624
1625   {
1626     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1627     u32 *to_next = vlib_frame_vector_args (f);
1628     to_next[0] = bi;
1629     f->n_vectors = 1;
1630     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1631   }
1632
1633   adj_unlock (ai);
1634   return /* no error */ 0;
1635 }
1636 #endif
1637
1638 typedef enum
1639 {
1640   IP6_REWRITE_NEXT_DROP,
1641   IP6_REWRITE_NEXT_ICMP_ERROR,
1642   IP6_REWRITE_NEXT_FRAGMENT,
1643   IP6_REWRITE_N_NEXT            /* Last */
1644 } ip6_rewrite_next_t;
1645
1646 /**
1647  * This bits of an IPv6 address to mask to construct a multicast
1648  * MAC address
1649  */
1650 #define IP6_MCAST_ADDR_MASK 0xffffffff
1651
1652 always_inline void
1653 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1654                u16 adj_packet_bytes, bool is_locally_generated,
1655                u32 * next, u8 is_midchain, u32 * error)
1656 {
1657   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1658     {
1659       if (is_locally_generated)
1660         {
1661           /* IP fragmentation */
1662           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1663                                    (is_midchain ?
1664                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1665                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1666           *next = IP6_REWRITE_NEXT_FRAGMENT;
1667           *error = IP6_ERROR_MTU_EXCEEDED;
1668         }
1669       else
1670         {
1671           *error = IP6_ERROR_MTU_EXCEEDED;
1672           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1673                                        adj_packet_bytes);
1674           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1675         }
1676     }
1677 }
1678
1679 always_inline uword
1680 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1681                              vlib_node_runtime_t * node,
1682                              vlib_frame_t * frame,
1683                              int do_counters, int is_midchain, int is_mcast,
1684                              int do_gso)
1685 {
1686   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1687   u32 *from = vlib_frame_vector_args (frame);
1688   u32 n_left_from, n_left_to_next, *to_next, next_index;
1689   vlib_node_runtime_t *error_node =
1690     vlib_node_get_runtime (vm, ip6_input_node.index);
1691
1692   n_left_from = frame->n_vectors;
1693   next_index = node->cached_next_index;
1694   u32 thread_index = vm->thread_index;
1695
1696   while (n_left_from > 0)
1697     {
1698       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1699
1700       while (n_left_from >= 4 && n_left_to_next >= 2)
1701         {
1702           ip_adjacency_t *adj0, *adj1;
1703           vlib_buffer_t *p0, *p1;
1704           ip6_header_t *ip0, *ip1;
1705           u32 pi0, rw_len0, next0, error0, adj_index0;
1706           u32 pi1, rw_len1, next1, error1, adj_index1;
1707           u32 tx_sw_if_index0, tx_sw_if_index1;
1708           bool is_locally_originated0, is_locally_originated1;
1709
1710           /* Prefetch next iteration. */
1711           {
1712             vlib_buffer_t *p2, *p3;
1713
1714             p2 = vlib_get_buffer (vm, from[2]);
1715             p3 = vlib_get_buffer (vm, from[3]);
1716
1717             vlib_prefetch_buffer_header (p2, LOAD);
1718             vlib_prefetch_buffer_header (p3, LOAD);
1719
1720             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1721             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1722
1723             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1724             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1725           }
1726
1727           pi0 = to_next[0] = from[0];
1728           pi1 = to_next[1] = from[1];
1729
1730           from += 2;
1731           n_left_from -= 2;
1732           to_next += 2;
1733           n_left_to_next -= 2;
1734
1735           p0 = vlib_get_buffer (vm, pi0);
1736           p1 = vlib_get_buffer (vm, pi1);
1737
1738           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1739           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1740
1741           ip0 = vlib_buffer_get_current (p0);
1742           ip1 = vlib_buffer_get_current (p1);
1743
1744           error0 = error1 = IP6_ERROR_NONE;
1745           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1746
1747           is_locally_originated0 =
1748             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1749           if (PREDICT_TRUE (!is_locally_originated0))
1750             {
1751               i32 hop_limit0 = ip0->hop_limit;
1752
1753               /* Input node should have reject packets with hop limit 0. */
1754               ASSERT (ip0->hop_limit > 0);
1755
1756               hop_limit0 -= 1;
1757
1758               ip0->hop_limit = hop_limit0;
1759
1760               /*
1761                * If the hop count drops below 1 when forwarding, generate
1762                * an ICMP response.
1763                */
1764               if (PREDICT_FALSE (hop_limit0 <= 0))
1765                 {
1766                   error0 = IP6_ERROR_TIME_EXPIRED;
1767                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1768                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1769                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1770                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1771                                                0);
1772                 }
1773             }
1774           else
1775             {
1776               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1777             }
1778           is_locally_originated1 =
1779             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1780           if (PREDICT_TRUE (!is_locally_originated1))
1781             {
1782               i32 hop_limit1 = ip1->hop_limit;
1783
1784               /* Input node should have reject packets with hop limit 0. */
1785               ASSERT (ip1->hop_limit > 0);
1786
1787               hop_limit1 -= 1;
1788
1789               ip1->hop_limit = hop_limit1;
1790
1791               /*
1792                * If the hop count drops below 1 when forwarding, generate
1793                * an ICMP response.
1794                */
1795               if (PREDICT_FALSE (hop_limit1 <= 0))
1796                 {
1797                   error1 = IP6_ERROR_TIME_EXPIRED;
1798                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1799                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1800                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1801                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1802                                                0);
1803                 }
1804             }
1805           else
1806             {
1807               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1808             }
1809           adj0 = adj_get (adj_index0);
1810           adj1 = adj_get (adj_index1);
1811
1812           rw_len0 = adj0[0].rewrite_header.data_bytes;
1813           rw_len1 = adj1[0].rewrite_header.data_bytes;
1814           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1815           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1816
1817           if (do_counters)
1818             {
1819               vlib_increment_combined_counter
1820                 (&adjacency_counters,
1821                  thread_index, adj_index0, 1,
1822                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1823               vlib_increment_combined_counter
1824                 (&adjacency_counters,
1825                  thread_index, adj_index1, 1,
1826                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1827             }
1828
1829           /* Check MTU of outgoing interface. */
1830           u16 ip0_len =
1831             clib_net_to_host_u16 (ip0->payload_length) +
1832             sizeof (ip6_header_t);
1833           u16 ip1_len =
1834             clib_net_to_host_u16 (ip1->payload_length) +
1835             sizeof (ip6_header_t);
1836           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
1837             ip0_len = gso_mtu_sz (p0);
1838           if (do_gso && (p1->flags & VNET_BUFFER_F_GSO))
1839             ip1_len = gso_mtu_sz (p1);
1840
1841
1842
1843           ip6_mtu_check (p0, ip0_len,
1844                          adj0[0].rewrite_header.max_l3_packet_bytes,
1845                          is_locally_originated0, &next0, is_midchain,
1846                          &error0);
1847           ip6_mtu_check (p1, ip1_len,
1848                          adj1[0].rewrite_header.max_l3_packet_bytes,
1849                          is_locally_originated1, &next1, is_midchain,
1850                          &error1);
1851
1852           /* Don't adjust the buffer for hop count issue; icmp-error node
1853            * wants to see the IP header */
1854           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1855             {
1856               p0->current_data -= rw_len0;
1857               p0->current_length += rw_len0;
1858
1859               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1860               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1861               next0 = adj0[0].rewrite_header.next_index;
1862
1863               if (PREDICT_FALSE
1864                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1865                 vnet_feature_arc_start (lm->output_feature_arc_index,
1866                                         tx_sw_if_index0, &next0, p0);
1867             }
1868           else
1869             {
1870               p0->error = error_node->errors[error0];
1871             }
1872           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1873             {
1874               p1->current_data -= rw_len1;
1875               p1->current_length += rw_len1;
1876
1877               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1878               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1879               next1 = adj1[0].rewrite_header.next_index;
1880
1881               if (PREDICT_FALSE
1882                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1883                 vnet_feature_arc_start (lm->output_feature_arc_index,
1884                                         tx_sw_if_index1, &next1, p1);
1885             }
1886           else
1887             {
1888               p1->error = error_node->errors[error1];
1889             }
1890
1891           if (is_midchain)
1892             {
1893               /* before we paint on the next header, update the L4
1894                * checksums if required, since there's no offload on a tunnel */
1895               calc_checksums (vm, p0);
1896               calc_checksums (vm, p1);
1897             }
1898
1899           /* Guess we are only writing on simple Ethernet header. */
1900           vnet_rewrite_two_headers (adj0[0], adj1[0],
1901                                     ip0, ip1, sizeof (ethernet_header_t));
1902
1903           if (is_midchain)
1904             {
1905               if (adj0->sub_type.midchain.fixup_func)
1906                 adj0->sub_type.midchain.fixup_func
1907                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1908               if (adj1->sub_type.midchain.fixup_func)
1909                 adj1->sub_type.midchain.fixup_func
1910                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1911             }
1912           if (is_mcast)
1913             {
1914               /*
1915                * copy bytes from the IP address into the MAC rewrite
1916                */
1917               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1918                                           adj0->
1919                                           rewrite_header.dst_mcast_offset,
1920                                           &ip0->dst_address.as_u32[3],
1921                                           (u8 *) ip0);
1922               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1923                                           adj1->
1924                                           rewrite_header.dst_mcast_offset,
1925                                           &ip1->dst_address.as_u32[3],
1926                                           (u8 *) ip1);
1927             }
1928
1929           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1930                                            to_next, n_left_to_next,
1931                                            pi0, pi1, next0, next1);
1932         }
1933
1934       while (n_left_from > 0 && n_left_to_next > 0)
1935         {
1936           ip_adjacency_t *adj0;
1937           vlib_buffer_t *p0;
1938           ip6_header_t *ip0;
1939           u32 pi0, rw_len0;
1940           u32 adj_index0, next0, error0;
1941           u32 tx_sw_if_index0;
1942           bool is_locally_originated0;
1943
1944           pi0 = to_next[0] = from[0];
1945
1946           p0 = vlib_get_buffer (vm, pi0);
1947
1948           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1949
1950           adj0 = adj_get (adj_index0);
1951
1952           ip0 = vlib_buffer_get_current (p0);
1953
1954           error0 = IP6_ERROR_NONE;
1955           next0 = IP6_REWRITE_NEXT_DROP;
1956
1957           /* Check hop limit */
1958           is_locally_originated0 =
1959             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1960           if (PREDICT_TRUE (!is_locally_originated0))
1961             {
1962               i32 hop_limit0 = ip0->hop_limit;
1963
1964               ASSERT (ip0->hop_limit > 0);
1965
1966               hop_limit0 -= 1;
1967
1968               ip0->hop_limit = hop_limit0;
1969
1970               if (PREDICT_FALSE (hop_limit0 <= 0))
1971                 {
1972                   /*
1973                    * If the hop count drops below 1 when forwarding, generate
1974                    * an ICMP response.
1975                    */
1976                   error0 = IP6_ERROR_TIME_EXPIRED;
1977                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1978                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1979                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1980                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1981                                                0);
1982                 }
1983             }
1984           else
1985             {
1986               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1987             }
1988
1989           if (is_midchain)
1990             {
1991               calc_checksums (vm, p0);
1992             }
1993
1994           /* Guess we are only writing on simple Ethernet header. */
1995           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1996
1997           /* Update packet buffer attributes/set output interface. */
1998           rw_len0 = adj0[0].rewrite_header.data_bytes;
1999           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2000
2001           if (do_counters)
2002             {
2003               vlib_increment_combined_counter
2004                 (&adjacency_counters,
2005                  thread_index, adj_index0, 1,
2006                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2007             }
2008
2009           /* Check MTU of outgoing interface. */
2010           u16 ip0_len =
2011             clib_net_to_host_u16 (ip0->payload_length) +
2012             sizeof (ip6_header_t);
2013           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
2014             ip0_len = gso_mtu_sz (p0);
2015
2016           ip6_mtu_check (p0, ip0_len,
2017                          adj0[0].rewrite_header.max_l3_packet_bytes,
2018                          is_locally_originated0, &next0, is_midchain,
2019                          &error0);
2020
2021           /* Don't adjust the buffer for hop count issue; icmp-error node
2022            * wants to see the IP header */
2023           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2024             {
2025               p0->current_data -= rw_len0;
2026               p0->current_length += rw_len0;
2027
2028               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2029
2030               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2031               next0 = adj0[0].rewrite_header.next_index;
2032
2033               if (PREDICT_FALSE
2034                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2035                 vnet_feature_arc_start (lm->output_feature_arc_index,
2036                                         tx_sw_if_index0, &next0, p0);
2037             }
2038           else
2039             {
2040               p0->error = error_node->errors[error0];
2041             }
2042
2043           if (is_midchain)
2044             {
2045               if (adj0->sub_type.midchain.fixup_func)
2046                 adj0->sub_type.midchain.fixup_func
2047                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2048             }
2049           if (is_mcast)
2050             {
2051               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2052                                           adj0->
2053                                           rewrite_header.dst_mcast_offset,
2054                                           &ip0->dst_address.as_u32[3],
2055                                           (u8 *) ip0);
2056             }
2057
2058           from += 1;
2059           n_left_from -= 1;
2060           to_next += 1;
2061           n_left_to_next -= 1;
2062
2063           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2064                                            to_next, n_left_to_next,
2065                                            pi0, next0);
2066         }
2067
2068       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2069     }
2070
2071   /* Need to do trace after rewrites to pick up new packet data. */
2072   if (node->flags & VLIB_NODE_FLAG_TRACE)
2073     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2074
2075   return frame->n_vectors;
2076 }
2077
2078 always_inline uword
2079 ip6_rewrite_inline (vlib_main_t * vm,
2080                     vlib_node_runtime_t * node,
2081                     vlib_frame_t * frame,
2082                     int do_counters, int is_midchain, int is_mcast)
2083 {
2084   vnet_main_t *vnm = vnet_get_main ();
2085   if (PREDICT_FALSE (vnm->interface_main.gso_interface_count > 0))
2086     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2087                                         is_midchain, is_mcast,
2088                                         1 /* do_gso */ );
2089   else
2090     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2091                                         is_midchain, is_mcast,
2092                                         0 /* no do_gso */ );
2093 }
2094
2095 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2096                                  vlib_node_runtime_t * node,
2097                                  vlib_frame_t * frame)
2098 {
2099   if (adj_are_counters_enabled ())
2100     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2101   else
2102     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2103 }
2104
2105 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2106                                        vlib_node_runtime_t * node,
2107                                        vlib_frame_t * frame)
2108 {
2109   if (adj_are_counters_enabled ())
2110     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2111   else
2112     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2113 }
2114
2115 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2116                                        vlib_node_runtime_t * node,
2117                                        vlib_frame_t * frame)
2118 {
2119   if (adj_are_counters_enabled ())
2120     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2121   else
2122     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2123 }
2124
2125 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2126                                   vlib_node_runtime_t * node,
2127                                   vlib_frame_t * frame)
2128 {
2129   if (adj_are_counters_enabled ())
2130     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2131   else
2132     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2133 }
2134
2135 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2136                                         vlib_node_runtime_t * node,
2137                                         vlib_frame_t * frame)
2138 {
2139   if (adj_are_counters_enabled ())
2140     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2141   else
2142     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2143 }
2144
2145 /* *INDENT-OFF* */
2146 VLIB_REGISTER_NODE (ip6_midchain_node) =
2147 {
2148   .name = "ip6-midchain",
2149   .vector_size = sizeof (u32),
2150   .format_trace = format_ip6_forward_next_trace,
2151   .sibling_of = "ip6-rewrite",
2152   };
2153
2154 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2155 {
2156   .name = "ip6-rewrite",
2157   .vector_size = sizeof (u32),
2158   .format_trace = format_ip6_rewrite_trace,
2159   .n_next_nodes = IP6_REWRITE_N_NEXT,
2160   .next_nodes =
2161   {
2162     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2163     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2164     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2165   },
2166 };
2167
2168 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2169   .name = "ip6-rewrite-bcast",
2170   .vector_size = sizeof (u32),
2171
2172   .format_trace = format_ip6_rewrite_trace,
2173   .sibling_of = "ip6-rewrite",
2174 };
2175
2176 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2177 {
2178   .name = "ip6-rewrite-mcast",
2179   .vector_size = sizeof (u32),
2180   .format_trace = format_ip6_rewrite_trace,
2181   .sibling_of = "ip6-rewrite",
2182 };
2183
2184
2185 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2186 {
2187   .name = "ip6-mcast-midchain",
2188   .vector_size = sizeof (u32),
2189   .format_trace = format_ip6_rewrite_trace,
2190   .sibling_of = "ip6-rewrite",
2191 };
2192
2193 /* *INDENT-ON* */
2194
2195 /*
2196  * Hop-by-Hop handling
2197  */
2198 #ifndef CLIB_MARCH_VARIANT
2199 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2200 #endif /* CLIB_MARCH_VARIANT */
2201
2202 #define foreach_ip6_hop_by_hop_error \
2203 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2204 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2205 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2206
2207 /* *INDENT-OFF* */
2208 typedef enum
2209 {
2210 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2211   foreach_ip6_hop_by_hop_error
2212 #undef _
2213   IP6_HOP_BY_HOP_N_ERROR,
2214 } ip6_hop_by_hop_error_t;
2215 /* *INDENT-ON* */
2216
2217 /*
2218  * Primary h-b-h handler trace support
2219  * We work pretty hard on the problem for obvious reasons
2220  */
2221 typedef struct
2222 {
2223   u32 next_index;
2224   u32 trace_len;
2225   u8 option_data[256];
2226 } ip6_hop_by_hop_trace_t;
2227
2228 extern vlib_node_registration_t ip6_hop_by_hop_node;
2229
2230 static char *ip6_hop_by_hop_error_strings[] = {
2231 #define _(sym,string) string,
2232   foreach_ip6_hop_by_hop_error
2233 #undef _
2234 };
2235
2236 #ifndef CLIB_MARCH_VARIANT
2237 u8 *
2238 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2239 {
2240   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2241   int total_len = va_arg (*args, int);
2242   ip6_hop_by_hop_option_t *opt0, *limit0;
2243   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2244   u8 type0;
2245
2246   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2247               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2248
2249   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2250   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2251
2252   while (opt0 < limit0)
2253     {
2254       type0 = opt0->type;
2255       switch (type0)
2256         {
2257         case 0:         /* Pad, just stop */
2258           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2259           break;
2260
2261         default:
2262           if (hm->trace[type0])
2263             {
2264               s = (*hm->trace[type0]) (s, opt0);
2265             }
2266           else
2267             {
2268               s =
2269                 format (s, "\n    unrecognized option %d length %d", type0,
2270                         opt0->length);
2271             }
2272           opt0 =
2273             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2274                                          sizeof (ip6_hop_by_hop_option_t));
2275           break;
2276         }
2277     }
2278   return s;
2279 }
2280 #endif
2281
2282 static u8 *
2283 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2284 {
2285   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2286   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2287   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2288   ip6_hop_by_hop_header_t *hbh0;
2289   ip6_hop_by_hop_option_t *opt0, *limit0;
2290   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2291
2292   u8 type0;
2293
2294   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2295
2296   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2297               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2298
2299   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2300   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2301
2302   while (opt0 < limit0)
2303     {
2304       type0 = opt0->type;
2305       switch (type0)
2306         {
2307         case 0:         /* Pad, just stop */
2308           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2309           break;
2310
2311         default:
2312           if (hm->trace[type0])
2313             {
2314               s = (*hm->trace[type0]) (s, opt0);
2315             }
2316           else
2317             {
2318               s =
2319                 format (s, "\n    unrecognized option %d length %d", type0,
2320                         opt0->length);
2321             }
2322           opt0 =
2323             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2324                                          sizeof (ip6_hop_by_hop_option_t));
2325           break;
2326         }
2327     }
2328   return s;
2329 }
2330
2331 always_inline u8
2332 ip6_scan_hbh_options (vlib_buffer_t * b0,
2333                       ip6_header_t * ip0,
2334                       ip6_hop_by_hop_header_t * hbh0,
2335                       ip6_hop_by_hop_option_t * opt0,
2336                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2337 {
2338   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2339   u8 type0;
2340   u8 error0 = 0;
2341
2342   while (opt0 < limit0)
2343     {
2344       type0 = opt0->type;
2345       switch (type0)
2346         {
2347         case 0:         /* Pad1 */
2348           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2349           continue;
2350         case 1:         /* PadN */
2351           break;
2352         default:
2353           if (hm->options[type0])
2354             {
2355               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2356                 {
2357                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2358                   return (error0);
2359                 }
2360             }
2361           else
2362             {
2363               /* Unrecognized mandatory option, check the two high order bits */
2364               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2365                 {
2366                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2367                   break;
2368                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2369                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2370                   *next0 = IP_LOOKUP_NEXT_DROP;
2371                   break;
2372                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2373                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2374                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2375                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2376                                                ICMP6_parameter_problem_unrecognized_option,
2377                                                (u8 *) opt0 - (u8 *) ip0);
2378                   break;
2379                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2380                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2381                   if (!ip6_address_is_multicast (&ip0->dst_address))
2382                     {
2383                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2384                       icmp6_error_set_vnet_buffer (b0,
2385                                                    ICMP6_parameter_problem,
2386                                                    ICMP6_parameter_problem_unrecognized_option,
2387                                                    (u8 *) opt0 - (u8 *) ip0);
2388                     }
2389                   else
2390                     {
2391                       *next0 = IP_LOOKUP_NEXT_DROP;
2392                     }
2393                   break;
2394                 }
2395               return (error0);
2396             }
2397         }
2398       opt0 =
2399         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2400                                      sizeof (ip6_hop_by_hop_option_t));
2401     }
2402   return (error0);
2403 }
2404
2405 /*
2406  * Process the Hop-by-Hop Options header
2407  */
2408 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2409                                     vlib_node_runtime_t * node,
2410                                     vlib_frame_t * frame)
2411 {
2412   vlib_node_runtime_t *error_node =
2413     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2414   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2415   u32 n_left_from, *from, *to_next;
2416   ip_lookup_next_t next_index;
2417
2418   from = vlib_frame_vector_args (frame);
2419   n_left_from = frame->n_vectors;
2420   next_index = node->cached_next_index;
2421
2422   while (n_left_from > 0)
2423     {
2424       u32 n_left_to_next;
2425
2426       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2427
2428       while (n_left_from >= 4 && n_left_to_next >= 2)
2429         {
2430           u32 bi0, bi1;
2431           vlib_buffer_t *b0, *b1;
2432           u32 next0, next1;
2433           ip6_header_t *ip0, *ip1;
2434           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2435           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2436           u8 error0 = 0, error1 = 0;
2437
2438           /* Prefetch next iteration. */
2439           {
2440             vlib_buffer_t *p2, *p3;
2441
2442             p2 = vlib_get_buffer (vm, from[2]);
2443             p3 = vlib_get_buffer (vm, from[3]);
2444
2445             vlib_prefetch_buffer_header (p2, LOAD);
2446             vlib_prefetch_buffer_header (p3, LOAD);
2447
2448             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2449             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2450           }
2451
2452           /* Speculatively enqueue b0, b1 to the current next frame */
2453           to_next[0] = bi0 = from[0];
2454           to_next[1] = bi1 = from[1];
2455           from += 2;
2456           to_next += 2;
2457           n_left_from -= 2;
2458           n_left_to_next -= 2;
2459
2460           b0 = vlib_get_buffer (vm, bi0);
2461           b1 = vlib_get_buffer (vm, bi1);
2462
2463           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2464           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2465           ip_adjacency_t *adj0 = adj_get (adj_index0);
2466           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2467           ip_adjacency_t *adj1 = adj_get (adj_index1);
2468
2469           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2470           next0 = adj0->lookup_next_index;
2471           next1 = adj1->lookup_next_index;
2472
2473           ip0 = vlib_buffer_get_current (b0);
2474           ip1 = vlib_buffer_get_current (b1);
2475           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2476           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2477           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2478           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2479           limit0 =
2480             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2481                                          ((hbh0->length + 1) << 3));
2482           limit1 =
2483             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2484                                          ((hbh1->length + 1) << 3));
2485
2486           /*
2487            * Basic validity checks
2488            */
2489           if ((hbh0->length + 1) << 3 >
2490               clib_net_to_host_u16 (ip0->payload_length))
2491             {
2492               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2493               next0 = IP_LOOKUP_NEXT_DROP;
2494               goto outdual;
2495             }
2496           /* Scan the set of h-b-h options, process ones that we understand */
2497           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2498
2499           if ((hbh1->length + 1) << 3 >
2500               clib_net_to_host_u16 (ip1->payload_length))
2501             {
2502               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2503               next1 = IP_LOOKUP_NEXT_DROP;
2504               goto outdual;
2505             }
2506           /* Scan the set of h-b-h options, process ones that we understand */
2507           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2508
2509         outdual:
2510           /* Has the classifier flagged this buffer for special treatment? */
2511           if (PREDICT_FALSE
2512               ((error0 == 0)
2513                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2514             next0 = hm->next_override;
2515
2516           /* Has the classifier flagged this buffer for special treatment? */
2517           if (PREDICT_FALSE
2518               ((error1 == 0)
2519                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2520             next1 = hm->next_override;
2521
2522           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2523             {
2524               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2525                 {
2526                   ip6_hop_by_hop_trace_t *t =
2527                     vlib_add_trace (vm, node, b0, sizeof (*t));
2528                   u32 trace_len = (hbh0->length + 1) << 3;
2529                   t->next_index = next0;
2530                   /* Capture the h-b-h option verbatim */
2531                   trace_len =
2532                     trace_len <
2533                     ARRAY_LEN (t->option_data) ? trace_len :
2534                     ARRAY_LEN (t->option_data);
2535                   t->trace_len = trace_len;
2536                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2537                 }
2538               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2539                 {
2540                   ip6_hop_by_hop_trace_t *t =
2541                     vlib_add_trace (vm, node, b1, sizeof (*t));
2542                   u32 trace_len = (hbh1->length + 1) << 3;
2543                   t->next_index = next1;
2544                   /* Capture the h-b-h option verbatim */
2545                   trace_len =
2546                     trace_len <
2547                     ARRAY_LEN (t->option_data) ? trace_len :
2548                     ARRAY_LEN (t->option_data);
2549                   t->trace_len = trace_len;
2550                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2551                 }
2552
2553             }
2554
2555           b0->error = error_node->errors[error0];
2556           b1->error = error_node->errors[error1];
2557
2558           /* verify speculative enqueue, maybe switch current next frame */
2559           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2560                                            n_left_to_next, bi0, bi1, next0,
2561                                            next1);
2562         }
2563
2564       while (n_left_from > 0 && n_left_to_next > 0)
2565         {
2566           u32 bi0;
2567           vlib_buffer_t *b0;
2568           u32 next0;
2569           ip6_header_t *ip0;
2570           ip6_hop_by_hop_header_t *hbh0;
2571           ip6_hop_by_hop_option_t *opt0, *limit0;
2572           u8 error0 = 0;
2573
2574           /* Speculatively enqueue b0 to the current next frame */
2575           bi0 = from[0];
2576           to_next[0] = bi0;
2577           from += 1;
2578           to_next += 1;
2579           n_left_from -= 1;
2580           n_left_to_next -= 1;
2581
2582           b0 = vlib_get_buffer (vm, bi0);
2583           /*
2584            * Default use the next_index from the adjacency.
2585            * A HBH option rarely redirects to a different node
2586            */
2587           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2588           ip_adjacency_t *adj0 = adj_get (adj_index0);
2589           next0 = adj0->lookup_next_index;
2590
2591           ip0 = vlib_buffer_get_current (b0);
2592           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2593           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2594           limit0 =
2595             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2596                                          ((hbh0->length + 1) << 3));
2597
2598           /*
2599            * Basic validity checks
2600            */
2601           if ((hbh0->length + 1) << 3 >
2602               clib_net_to_host_u16 (ip0->payload_length))
2603             {
2604               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2605               next0 = IP_LOOKUP_NEXT_DROP;
2606               goto out0;
2607             }
2608
2609           /* Scan the set of h-b-h options, process ones that we understand */
2610           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2611
2612         out0:
2613           /* Has the classifier flagged this buffer for special treatment? */
2614           if (PREDICT_FALSE
2615               ((error0 == 0)
2616                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2617             next0 = hm->next_override;
2618
2619           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2620             {
2621               ip6_hop_by_hop_trace_t *t =
2622                 vlib_add_trace (vm, node, b0, sizeof (*t));
2623               u32 trace_len = (hbh0->length + 1) << 3;
2624               t->next_index = next0;
2625               /* Capture the h-b-h option verbatim */
2626               trace_len =
2627                 trace_len <
2628                 ARRAY_LEN (t->option_data) ? trace_len :
2629                 ARRAY_LEN (t->option_data);
2630               t->trace_len = trace_len;
2631               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2632             }
2633
2634           b0->error = error_node->errors[error0];
2635
2636           /* verify speculative enqueue, maybe switch current next frame */
2637           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2638                                            n_left_to_next, bi0, next0);
2639         }
2640       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2641     }
2642   return frame->n_vectors;
2643 }
2644
2645 /* *INDENT-OFF* */
2646 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2647 {
2648   .name = "ip6-hop-by-hop",
2649   .sibling_of = "ip6-lookup",
2650   .vector_size = sizeof (u32),
2651   .format_trace = format_ip6_hop_by_hop_trace,
2652   .type = VLIB_NODE_TYPE_INTERNAL,
2653   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2654   .error_strings = ip6_hop_by_hop_error_strings,
2655   .n_next_nodes = 0,
2656 };
2657 /* *INDENT-ON* */
2658
2659 static clib_error_t *
2660 ip6_hop_by_hop_init (vlib_main_t * vm)
2661 {
2662   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2663   clib_memset (hm->options, 0, sizeof (hm->options));
2664   clib_memset (hm->trace, 0, sizeof (hm->trace));
2665   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2666   return (0);
2667 }
2668
2669 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2670
2671 #ifndef CLIB_MARCH_VARIANT
2672 void
2673 ip6_hbh_set_next_override (uword next)
2674 {
2675   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2676
2677   hm->next_override = next;
2678 }
2679
2680 int
2681 ip6_hbh_register_option (u8 option,
2682                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2683                                       ip6_hop_by_hop_option_t * opt),
2684                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2685 {
2686   ip6_main_t *im = &ip6_main;
2687   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2688
2689   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2690
2691   /* Already registered */
2692   if (hm->options[option])
2693     return (-1);
2694
2695   hm->options[option] = options;
2696   hm->trace[option] = trace;
2697
2698   /* Set global variable */
2699   im->hbh_enabled = 1;
2700
2701   return (0);
2702 }
2703
2704 int
2705 ip6_hbh_unregister_option (u8 option)
2706 {
2707   ip6_main_t *im = &ip6_main;
2708   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2709
2710   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2711
2712   /* Not registered */
2713   if (!hm->options[option])
2714     return (-1);
2715
2716   hm->options[option] = NULL;
2717   hm->trace[option] = NULL;
2718
2719   /* Disable global knob if this was the last option configured */
2720   int i;
2721   bool found = false;
2722   for (i = 0; i < 256; i++)
2723     {
2724       if (hm->options[option])
2725         {
2726           found = true;
2727           break;
2728         }
2729     }
2730   if (!found)
2731     im->hbh_enabled = 0;
2732
2733   return (0);
2734 }
2735
2736 /* Global IP6 main. */
2737 ip6_main_t ip6_main;
2738 #endif
2739
2740 static clib_error_t *
2741 ip6_lookup_init (vlib_main_t * vm)
2742 {
2743   ip6_main_t *im = &ip6_main;
2744   clib_error_t *error;
2745   uword i;
2746
2747   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2748     return error;
2749
2750   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2751     {
2752       u32 j, i0, i1;
2753
2754       i0 = i / 32;
2755       i1 = i % 32;
2756
2757       for (j = 0; j < i0; j++)
2758         im->fib_masks[i].as_u32[j] = ~0;
2759
2760       if (i1)
2761         im->fib_masks[i].as_u32[i0] =
2762           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2763     }
2764
2765   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2766
2767   if (im->lookup_table_nbuckets == 0)
2768     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2769
2770   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2771
2772   if (im->lookup_table_size == 0)
2773     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2774
2775   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2776                          "ip6 FIB fwding table",
2777                          im->lookup_table_nbuckets, im->lookup_table_size);
2778   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2779                          "ip6 FIB non-fwding table",
2780                          im->lookup_table_nbuckets, im->lookup_table_size);
2781   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2782                          "ip6 mFIB table",
2783                          im->lookup_table_nbuckets, im->lookup_table_size);
2784
2785   /* Create FIB with index 0 and table id of 0. */
2786   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2787                                      FIB_SOURCE_DEFAULT_ROUTE);
2788   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2789                                       MFIB_SOURCE_DEFAULT_ROUTE);
2790
2791   {
2792     pg_node_t *pn;
2793     pn = pg_get_node (ip6_lookup_node.index);
2794     pn->unformat_edit = unformat_pg_ip6_header;
2795   }
2796
2797   /* Unless explicitly configured, don't process HBH options */
2798   im->hbh_enabled = 0;
2799
2800   {
2801     icmp6_neighbor_solicitation_header_t p;
2802
2803     clib_memset (&p, 0, sizeof (p));
2804
2805     p.ip.ip_version_traffic_class_and_flow_label =
2806       clib_host_to_net_u32 (0x6 << 28);
2807     p.ip.payload_length =
2808       clib_host_to_net_u16 (sizeof (p) -
2809                             STRUCT_OFFSET_OF
2810                             (icmp6_neighbor_solicitation_header_t, neighbor));
2811     p.ip.protocol = IP_PROTOCOL_ICMP6;
2812     p.ip.hop_limit = 255;
2813     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2814
2815     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2816
2817     p.link_layer_option.header.type =
2818       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2819     p.link_layer_option.header.n_data_u64s =
2820       sizeof (p.link_layer_option) / sizeof (u64);
2821
2822     vlib_packet_template_init (vm,
2823                                &im->discover_neighbor_packet_template,
2824                                &p, sizeof (p),
2825                                /* alloc chunk size */ 8,
2826                                "ip6 neighbor discovery");
2827   }
2828
2829   return error;
2830 }
2831
2832 VLIB_INIT_FUNCTION (ip6_lookup_init);
2833
2834 static clib_error_t *
2835 test_ip6_link_command_fn (vlib_main_t * vm,
2836                           unformat_input_t * input, vlib_cli_command_t * cmd)
2837 {
2838   u8 mac[6];
2839   ip6_address_t _a, *a = &_a;
2840
2841   if (unformat (input, "%U", unformat_ethernet_address, mac))
2842     {
2843       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2844       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2845       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2846       vlib_cli_output (vm, "Original MAC address: %U",
2847                        format_ethernet_address, mac);
2848     }
2849
2850   return 0;
2851 }
2852
2853 /*?
2854  * This command converts the given MAC Address into an IPv6 link-local
2855  * address.
2856  *
2857  * @cliexpar
2858  * Example of how to create an IPv6 link-local address:
2859  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2860  * Link local address: fe80::14d9:e0ff:fe91:7986
2861  * Original MAC address: 16:d9:e0:91:79:86
2862  * @cliexend
2863 ?*/
2864 /* *INDENT-OFF* */
2865 VLIB_CLI_COMMAND (test_link_command, static) =
2866 {
2867   .path = "test ip6 link",
2868   .function = test_ip6_link_command_fn,
2869   .short_help = "test ip6 link <mac-address>",
2870 };
2871 /* *INDENT-ON* */
2872
2873 #ifndef CLIB_MARCH_VARIANT
2874 int
2875 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2876 {
2877   u32 fib_index;
2878
2879   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2880
2881   if (~0 == fib_index)
2882     return VNET_API_ERROR_NO_SUCH_FIB;
2883
2884   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2885                                   flow_hash_config);
2886
2887   return 0;
2888 }
2889 #endif
2890
2891 static clib_error_t *
2892 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2893                               unformat_input_t * input,
2894                               vlib_cli_command_t * cmd)
2895 {
2896   int matched = 0;
2897   u32 table_id = 0;
2898   u32 flow_hash_config = 0;
2899   int rv;
2900
2901   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2902     {
2903       if (unformat (input, "table %d", &table_id))
2904         matched = 1;
2905 #define _(a,v) \
2906     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2907       foreach_flow_hash_bit
2908 #undef _
2909         else
2910         break;
2911     }
2912
2913   if (matched == 0)
2914     return clib_error_return (0, "unknown input `%U'",
2915                               format_unformat_error, input);
2916
2917   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2918   switch (rv)
2919     {
2920     case 0:
2921       break;
2922
2923     case -1:
2924       return clib_error_return (0, "no such FIB table %d", table_id);
2925
2926     default:
2927       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2928       break;
2929     }
2930
2931   return 0;
2932 }
2933
2934 /*?
2935  * Configure the set of IPv6 fields used by the flow hash.
2936  *
2937  * @cliexpar
2938  * @parblock
2939  * Example of how to set the flow hash on a given table:
2940  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2941  *
2942  * Example of display the configured flow hash:
2943  * @cliexstart{show ip6 fib}
2944  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2945  * @::/0
2946  *   unicast-ip6-chain
2947  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2948  *     [0] [@0]: dpo-drop ip6
2949  * fe80::/10
2950  *   unicast-ip6-chain
2951  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2952  *     [0] [@2]: dpo-receive
2953  * ff02::1/128
2954  *   unicast-ip6-chain
2955  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2956  *     [0] [@2]: dpo-receive
2957  * ff02::2/128
2958  *   unicast-ip6-chain
2959  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2960  *     [0] [@2]: dpo-receive
2961  * ff02::16/128
2962  *   unicast-ip6-chain
2963  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2964  *     [0] [@2]: dpo-receive
2965  * ff02::1:ff00:0/104
2966  *   unicast-ip6-chain
2967  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2968  *     [0] [@2]: dpo-receive
2969  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2970  * @::/0
2971  *   unicast-ip6-chain
2972  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2973  *     [0] [@0]: dpo-drop ip6
2974  * @::a:1:1:0:4/126
2975  *   unicast-ip6-chain
2976  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2977  *     [0] [@4]: ipv6-glean: af_packet0
2978  * @::a:1:1:0:7/128
2979  *   unicast-ip6-chain
2980  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2981  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2982  * fe80::/10
2983  *   unicast-ip6-chain
2984  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2985  *     [0] [@2]: dpo-receive
2986  * fe80::fe:3eff:fe3e:9222/128
2987  *   unicast-ip6-chain
2988  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2989  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2990  * ff02::1/128
2991  *   unicast-ip6-chain
2992  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2993  *     [0] [@2]: dpo-receive
2994  * ff02::2/128
2995  *   unicast-ip6-chain
2996  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2997  *     [0] [@2]: dpo-receive
2998  * ff02::16/128
2999  *   unicast-ip6-chain
3000  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
3001  *     [0] [@2]: dpo-receive
3002  * ff02::1:ff00:0/104
3003  *   unicast-ip6-chain
3004  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
3005  *     [0] [@2]: dpo-receive
3006  * @cliexend
3007  * @endparblock
3008 ?*/
3009 /* *INDENT-OFF* */
3010 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
3011 {
3012   .path = "set ip6 flow-hash",
3013   .short_help =
3014   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3015   .function = set_ip6_flow_hash_command_fn,
3016 };
3017 /* *INDENT-ON* */
3018
3019 static clib_error_t *
3020 show_ip6_local_command_fn (vlib_main_t * vm,
3021                            unformat_input_t * input, vlib_cli_command_t * cmd)
3022 {
3023   ip6_main_t *im = &ip6_main;
3024   ip_lookup_main_t *lm = &im->lookup_main;
3025   int i;
3026
3027   vlib_cli_output (vm, "Protocols handled by ip6_local");
3028   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
3029     {
3030       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3031         {
3032
3033           u32 node_index = vlib_get_node (vm,
3034                                           ip6_local_node.index)->
3035             next_nodes[lm->local_next_by_ip_protocol[i]];
3036           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
3037                            node_index);
3038         }
3039     }
3040   return 0;
3041 }
3042
3043
3044
3045 /*?
3046  * Display the set of protocols handled by the local IPv6 stack.
3047  *
3048  * @cliexpar
3049  * Example of how to display local protocol table:
3050  * @cliexstart{show ip6 local}
3051  * Protocols handled by ip6_local
3052  * 17
3053  * 43
3054  * 58
3055  * 115
3056  * @cliexend
3057 ?*/
3058 /* *INDENT-OFF* */
3059 VLIB_CLI_COMMAND (show_ip6_local, static) =
3060 {
3061   .path = "show ip6 local",
3062   .function = show_ip6_local_command_fn,
3063   .short_help = "show ip6 local",
3064 };
3065 /* *INDENT-ON* */
3066
3067 #ifndef CLIB_MARCH_VARIANT
3068 int
3069 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3070                              u32 table_index)
3071 {
3072   vnet_main_t *vnm = vnet_get_main ();
3073   vnet_interface_main_t *im = &vnm->interface_main;
3074   ip6_main_t *ipm = &ip6_main;
3075   ip_lookup_main_t *lm = &ipm->lookup_main;
3076   vnet_classify_main_t *cm = &vnet_classify_main;
3077   ip6_address_t *if_addr;
3078
3079   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3080     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3081
3082   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3083     return VNET_API_ERROR_NO_SUCH_ENTRY;
3084
3085   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3086   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3087
3088   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3089
3090   if (NULL != if_addr)
3091     {
3092       fib_prefix_t pfx = {
3093         .fp_len = 128,
3094         .fp_proto = FIB_PROTOCOL_IP6,
3095         .fp_addr.ip6 = *if_addr,
3096       };
3097       u32 fib_index;
3098
3099       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3100                                                        sw_if_index);
3101
3102
3103       if (table_index != (u32) ~ 0)
3104         {
3105           dpo_id_t dpo = DPO_INVALID;
3106
3107           dpo_set (&dpo,
3108                    DPO_CLASSIFY,
3109                    DPO_PROTO_IP6,
3110                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3111
3112           fib_table_entry_special_dpo_add (fib_index,
3113                                            &pfx,
3114                                            FIB_SOURCE_CLASSIFY,
3115                                            FIB_ENTRY_FLAG_NONE, &dpo);
3116           dpo_reset (&dpo);
3117         }
3118       else
3119         {
3120           fib_table_entry_special_remove (fib_index,
3121                                           &pfx, FIB_SOURCE_CLASSIFY);
3122         }
3123     }
3124
3125   return 0;
3126 }
3127 #endif
3128
3129 static clib_error_t *
3130 set_ip6_classify_command_fn (vlib_main_t * vm,
3131                              unformat_input_t * input,
3132                              vlib_cli_command_t * cmd)
3133 {
3134   u32 table_index = ~0;
3135   int table_index_set = 0;
3136   u32 sw_if_index = ~0;
3137   int rv;
3138
3139   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3140     {
3141       if (unformat (input, "table-index %d", &table_index))
3142         table_index_set = 1;
3143       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3144                          vnet_get_main (), &sw_if_index))
3145         ;
3146       else
3147         break;
3148     }
3149
3150   if (table_index_set == 0)
3151     return clib_error_return (0, "classify table-index must be specified");
3152
3153   if (sw_if_index == ~0)
3154     return clib_error_return (0, "interface / subif must be specified");
3155
3156   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3157
3158   switch (rv)
3159     {
3160     case 0:
3161       break;
3162
3163     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3164       return clib_error_return (0, "No such interface");
3165
3166     case VNET_API_ERROR_NO_SUCH_ENTRY:
3167       return clib_error_return (0, "No such classifier table");
3168     }
3169   return 0;
3170 }
3171
3172 /*?
3173  * Assign a classification table to an interface. The classification
3174  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3175  * commands. Once the table is create, use this command to filter packets
3176  * on an interface.
3177  *
3178  * @cliexpar
3179  * Example of how to assign a classification table to an interface:
3180  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3181 ?*/
3182 /* *INDENT-OFF* */
3183 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3184 {
3185   .path = "set ip6 classify",
3186   .short_help =
3187   "set ip6 classify intfc <interface> table-index <classify-idx>",
3188   .function = set_ip6_classify_command_fn,
3189 };
3190 /* *INDENT-ON* */
3191
3192 static clib_error_t *
3193 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3194 {
3195   ip6_main_t *im = &ip6_main;
3196   uword heapsize = 0;
3197   u32 tmp;
3198   u32 nbuckets = 0;
3199
3200   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3201     {
3202       if (unformat (input, "hash-buckets %d", &tmp))
3203         nbuckets = tmp;
3204       else if (unformat (input, "heap-size %U",
3205                          unformat_memory_size, &heapsize))
3206         ;
3207       else
3208         return clib_error_return (0, "unknown input '%U'",
3209                                   format_unformat_error, input);
3210     }
3211
3212   im->lookup_table_nbuckets = nbuckets;
3213   im->lookup_table_size = heapsize;
3214
3215   return 0;
3216 }
3217
3218 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3219
3220 /*
3221  * fd.io coding-style-patch-verification: ON
3222  *
3223  * Local Variables:
3224  * eval: (c-set-style "gnu")
3225  * End:
3226  */