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->adj_index, 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, 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                                    IP6_FRAG_NEXT_IP6_REWRITE, 0);
1664           *next = IP6_REWRITE_NEXT_FRAGMENT;
1665           *error = IP6_ERROR_MTU_EXCEEDED;
1666         }
1667       else
1668         {
1669           *error = IP6_ERROR_MTU_EXCEEDED;
1670           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1671                                        adj_packet_bytes);
1672           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1673         }
1674     }
1675 }
1676
1677 always_inline uword
1678 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1679                              vlib_node_runtime_t * node,
1680                              vlib_frame_t * frame,
1681                              int do_counters, int is_midchain, int is_mcast,
1682                              int do_gso)
1683 {
1684   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1685   u32 *from = vlib_frame_vector_args (frame);
1686   u32 n_left_from, n_left_to_next, *to_next, next_index;
1687   vlib_node_runtime_t *error_node =
1688     vlib_node_get_runtime (vm, ip6_input_node.index);
1689
1690   n_left_from = frame->n_vectors;
1691   next_index = node->cached_next_index;
1692   u32 thread_index = vm->thread_index;
1693
1694   while (n_left_from > 0)
1695     {
1696       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1697
1698       while (n_left_from >= 4 && n_left_to_next >= 2)
1699         {
1700           ip_adjacency_t *adj0, *adj1;
1701           vlib_buffer_t *p0, *p1;
1702           ip6_header_t *ip0, *ip1;
1703           u32 pi0, rw_len0, next0, error0, adj_index0;
1704           u32 pi1, rw_len1, next1, error1, adj_index1;
1705           u32 tx_sw_if_index0, tx_sw_if_index1;
1706           bool is_locally_originated0, is_locally_originated1;
1707
1708           /* Prefetch next iteration. */
1709           {
1710             vlib_buffer_t *p2, *p3;
1711
1712             p2 = vlib_get_buffer (vm, from[2]);
1713             p3 = vlib_get_buffer (vm, from[3]);
1714
1715             vlib_prefetch_buffer_header (p2, LOAD);
1716             vlib_prefetch_buffer_header (p3, LOAD);
1717
1718             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1719             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1720
1721             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1722             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1723           }
1724
1725           pi0 = to_next[0] = from[0];
1726           pi1 = to_next[1] = from[1];
1727
1728           from += 2;
1729           n_left_from -= 2;
1730           to_next += 2;
1731           n_left_to_next -= 2;
1732
1733           p0 = vlib_get_buffer (vm, pi0);
1734           p1 = vlib_get_buffer (vm, pi1);
1735
1736           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1737           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1738
1739           ip0 = vlib_buffer_get_current (p0);
1740           ip1 = vlib_buffer_get_current (p1);
1741
1742           error0 = error1 = IP6_ERROR_NONE;
1743           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1744
1745           is_locally_originated0 =
1746             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1747           if (PREDICT_TRUE (!is_locally_originated0))
1748             {
1749               i32 hop_limit0 = ip0->hop_limit;
1750
1751               /* Input node should have reject packets with hop limit 0. */
1752               ASSERT (ip0->hop_limit > 0);
1753
1754               hop_limit0 -= 1;
1755
1756               ip0->hop_limit = hop_limit0;
1757
1758               /*
1759                * If the hop count drops below 1 when forwarding, generate
1760                * an ICMP response.
1761                */
1762               if (PREDICT_FALSE (hop_limit0 <= 0))
1763                 {
1764                   error0 = IP6_ERROR_TIME_EXPIRED;
1765                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1766                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1767                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1768                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1769                                                0);
1770                 }
1771             }
1772           else
1773             {
1774               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1775             }
1776           is_locally_originated1 =
1777             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1778           if (PREDICT_TRUE (!is_locally_originated1))
1779             {
1780               i32 hop_limit1 = ip1->hop_limit;
1781
1782               /* Input node should have reject packets with hop limit 0. */
1783               ASSERT (ip1->hop_limit > 0);
1784
1785               hop_limit1 -= 1;
1786
1787               ip1->hop_limit = hop_limit1;
1788
1789               /*
1790                * If the hop count drops below 1 when forwarding, generate
1791                * an ICMP response.
1792                */
1793               if (PREDICT_FALSE (hop_limit1 <= 0))
1794                 {
1795                   error1 = IP6_ERROR_TIME_EXPIRED;
1796                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1797                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1798                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1799                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1800                                                0);
1801                 }
1802             }
1803           else
1804             {
1805               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1806             }
1807           adj0 = adj_get (adj_index0);
1808           adj1 = adj_get (adj_index1);
1809
1810           rw_len0 = adj0[0].rewrite_header.data_bytes;
1811           rw_len1 = adj1[0].rewrite_header.data_bytes;
1812           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1813           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1814
1815           if (do_counters)
1816             {
1817               vlib_increment_combined_counter
1818                 (&adjacency_counters,
1819                  thread_index, adj_index0, 1,
1820                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1821               vlib_increment_combined_counter
1822                 (&adjacency_counters,
1823                  thread_index, adj_index1, 1,
1824                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1825             }
1826
1827           /* Check MTU of outgoing interface. */
1828           u16 ip0_len =
1829             clib_net_to_host_u16 (ip0->payload_length) +
1830             sizeof (ip6_header_t);
1831           u16 ip1_len =
1832             clib_net_to_host_u16 (ip1->payload_length) +
1833             sizeof (ip6_header_t);
1834           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
1835             ip0_len = gso_mtu_sz (p0);
1836           if (do_gso && (p1->flags & VNET_BUFFER_F_GSO))
1837             ip1_len = gso_mtu_sz (p1);
1838
1839
1840
1841           ip6_mtu_check (p0, ip0_len,
1842                          adj0[0].rewrite_header.max_l3_packet_bytes,
1843                          is_locally_originated0, &next0, &error0);
1844           ip6_mtu_check (p1, ip1_len,
1845                          adj1[0].rewrite_header.max_l3_packet_bytes,
1846                          is_locally_originated1, &next1, &error1);
1847
1848           /* Don't adjust the buffer for hop count issue; icmp-error node
1849            * wants to see the IP header */
1850           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1851             {
1852               p0->current_data -= rw_len0;
1853               p0->current_length += rw_len0;
1854
1855               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1856               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1857               next0 = adj0[0].rewrite_header.next_index;
1858
1859               if (PREDICT_FALSE
1860                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1861                 vnet_feature_arc_start (lm->output_feature_arc_index,
1862                                         tx_sw_if_index0, &next0, p0);
1863             }
1864           else
1865             {
1866               p0->error = error_node->errors[error0];
1867             }
1868           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1869             {
1870               p1->current_data -= rw_len1;
1871               p1->current_length += rw_len1;
1872
1873               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1874               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1875               next1 = adj1[0].rewrite_header.next_index;
1876
1877               if (PREDICT_FALSE
1878                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1879                 vnet_feature_arc_start (lm->output_feature_arc_index,
1880                                         tx_sw_if_index1, &next1, p1);
1881             }
1882           else
1883             {
1884               p1->error = error_node->errors[error1];
1885             }
1886
1887           if (is_midchain)
1888             {
1889               /* before we paint on the next header, update the L4
1890                * checksums if required, since there's no offload on a tunnel */
1891               calc_checksums (vm, p0);
1892               calc_checksums (vm, p1);
1893             }
1894
1895           /* Guess we are only writing on simple Ethernet header. */
1896           vnet_rewrite_two_headers (adj0[0], adj1[0],
1897                                     ip0, ip1, sizeof (ethernet_header_t));
1898
1899           if (is_midchain)
1900             {
1901               if (adj0->sub_type.midchain.fixup_func)
1902                 adj0->sub_type.midchain.fixup_func
1903                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1904               if (adj1->sub_type.midchain.fixup_func)
1905                 adj1->sub_type.midchain.fixup_func
1906                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1907             }
1908           if (is_mcast)
1909             {
1910               /*
1911                * copy bytes from the IP address into the MAC rewrite
1912                */
1913               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1914                                           adj0->
1915                                           rewrite_header.dst_mcast_offset,
1916                                           &ip0->dst_address.as_u32[3],
1917                                           (u8 *) ip0);
1918               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1919                                           adj1->
1920                                           rewrite_header.dst_mcast_offset,
1921                                           &ip1->dst_address.as_u32[3],
1922                                           (u8 *) ip1);
1923             }
1924
1925           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1926                                            to_next, n_left_to_next,
1927                                            pi0, pi1, next0, next1);
1928         }
1929
1930       while (n_left_from > 0 && n_left_to_next > 0)
1931         {
1932           ip_adjacency_t *adj0;
1933           vlib_buffer_t *p0;
1934           ip6_header_t *ip0;
1935           u32 pi0, rw_len0;
1936           u32 adj_index0, next0, error0;
1937           u32 tx_sw_if_index0;
1938           bool is_locally_originated0;
1939
1940           pi0 = to_next[0] = from[0];
1941
1942           p0 = vlib_get_buffer (vm, pi0);
1943
1944           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1945
1946           adj0 = adj_get (adj_index0);
1947
1948           ip0 = vlib_buffer_get_current (p0);
1949
1950           error0 = IP6_ERROR_NONE;
1951           next0 = IP6_REWRITE_NEXT_DROP;
1952
1953           /* Check hop limit */
1954           is_locally_originated0 =
1955             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1956           if (PREDICT_TRUE (!is_locally_originated0))
1957             {
1958               i32 hop_limit0 = ip0->hop_limit;
1959
1960               ASSERT (ip0->hop_limit > 0);
1961
1962               hop_limit0 -= 1;
1963
1964               ip0->hop_limit = hop_limit0;
1965
1966               if (PREDICT_FALSE (hop_limit0 <= 0))
1967                 {
1968                   /*
1969                    * If the hop count drops below 1 when forwarding, generate
1970                    * an ICMP response.
1971                    */
1972                   error0 = IP6_ERROR_TIME_EXPIRED;
1973                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1974                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1975                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1976                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1977                                                0);
1978                 }
1979             }
1980           else
1981             {
1982               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1983             }
1984
1985           if (is_midchain)
1986             {
1987               calc_checksums (vm, p0);
1988             }
1989
1990           /* Guess we are only writing on simple Ethernet header. */
1991           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1992
1993           /* Update packet buffer attributes/set output interface. */
1994           rw_len0 = adj0[0].rewrite_header.data_bytes;
1995           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1996
1997           if (do_counters)
1998             {
1999               vlib_increment_combined_counter
2000                 (&adjacency_counters,
2001                  thread_index, adj_index0, 1,
2002                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2003             }
2004
2005           /* Check MTU of outgoing interface. */
2006           u16 ip0_len =
2007             clib_net_to_host_u16 (ip0->payload_length) +
2008             sizeof (ip6_header_t);
2009           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
2010             ip0_len = gso_mtu_sz (p0);
2011
2012           ip6_mtu_check (p0, ip0_len,
2013                          adj0[0].rewrite_header.max_l3_packet_bytes,
2014                          is_locally_originated0, &next0, &error0);
2015
2016           /* Don't adjust the buffer for hop count issue; icmp-error node
2017            * wants to see the IP header */
2018           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2019             {
2020               p0->current_data -= rw_len0;
2021               p0->current_length += rw_len0;
2022
2023               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2024
2025               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2026               next0 = adj0[0].rewrite_header.next_index;
2027
2028               if (PREDICT_FALSE
2029                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2030                 vnet_feature_arc_start (lm->output_feature_arc_index,
2031                                         tx_sw_if_index0, &next0, p0);
2032             }
2033           else
2034             {
2035               p0->error = error_node->errors[error0];
2036             }
2037
2038           if (is_midchain)
2039             {
2040               if (adj0->sub_type.midchain.fixup_func)
2041                 adj0->sub_type.midchain.fixup_func
2042                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2043             }
2044           if (is_mcast)
2045             {
2046               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2047                                           adj0->
2048                                           rewrite_header.dst_mcast_offset,
2049                                           &ip0->dst_address.as_u32[3],
2050                                           (u8 *) ip0);
2051             }
2052
2053           from += 1;
2054           n_left_from -= 1;
2055           to_next += 1;
2056           n_left_to_next -= 1;
2057
2058           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2059                                            to_next, n_left_to_next,
2060                                            pi0, next0);
2061         }
2062
2063       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2064     }
2065
2066   /* Need to do trace after rewrites to pick up new packet data. */
2067   if (node->flags & VLIB_NODE_FLAG_TRACE)
2068     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2069
2070   return frame->n_vectors;
2071 }
2072
2073 always_inline uword
2074 ip6_rewrite_inline (vlib_main_t * vm,
2075                     vlib_node_runtime_t * node,
2076                     vlib_frame_t * frame,
2077                     int do_counters, int is_midchain, int is_mcast)
2078 {
2079   vnet_main_t *vnm = vnet_get_main ();
2080   if (PREDICT_FALSE (vnm->interface_main.gso_interface_count > 0))
2081     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2082                                         is_midchain, is_mcast,
2083                                         1 /* do_gso */ );
2084   else
2085     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2086                                         is_midchain, is_mcast,
2087                                         0 /* no do_gso */ );
2088 }
2089
2090 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2091                                  vlib_node_runtime_t * node,
2092                                  vlib_frame_t * frame)
2093 {
2094   if (adj_are_counters_enabled ())
2095     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2096   else
2097     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2098 }
2099
2100 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2101                                        vlib_node_runtime_t * node,
2102                                        vlib_frame_t * frame)
2103 {
2104   if (adj_are_counters_enabled ())
2105     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2106   else
2107     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2108 }
2109
2110 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2111                                        vlib_node_runtime_t * node,
2112                                        vlib_frame_t * frame)
2113 {
2114   if (adj_are_counters_enabled ())
2115     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2116   else
2117     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2118 }
2119
2120 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2121                                   vlib_node_runtime_t * node,
2122                                   vlib_frame_t * frame)
2123 {
2124   if (adj_are_counters_enabled ())
2125     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2126   else
2127     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2128 }
2129
2130 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2131                                         vlib_node_runtime_t * node,
2132                                         vlib_frame_t * frame)
2133 {
2134   if (adj_are_counters_enabled ())
2135     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2136   else
2137     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2138 }
2139
2140 /* *INDENT-OFF* */
2141 VLIB_REGISTER_NODE (ip6_midchain_node) =
2142 {
2143   .name = "ip6-midchain",
2144   .vector_size = sizeof (u32),
2145   .format_trace = format_ip6_forward_next_trace,
2146   .sibling_of = "ip6-rewrite",
2147   };
2148
2149 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2150 {
2151   .name = "ip6-rewrite",
2152   .vector_size = sizeof (u32),
2153   .format_trace = format_ip6_rewrite_trace,
2154   .n_next_nodes = IP6_REWRITE_N_NEXT,
2155   .next_nodes =
2156   {
2157     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2158     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2159     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2160   },
2161 };
2162
2163 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2164   .name = "ip6-rewrite-bcast",
2165   .vector_size = sizeof (u32),
2166
2167   .format_trace = format_ip6_rewrite_trace,
2168   .sibling_of = "ip6-rewrite",
2169 };
2170
2171 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2172 {
2173   .name = "ip6-rewrite-mcast",
2174   .vector_size = sizeof (u32),
2175   .format_trace = format_ip6_rewrite_trace,
2176   .sibling_of = "ip6-rewrite",
2177 };
2178
2179
2180 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2181 {
2182   .name = "ip6-mcast-midchain",
2183   .vector_size = sizeof (u32),
2184   .format_trace = format_ip6_rewrite_trace,
2185   .sibling_of = "ip6-rewrite",
2186 };
2187
2188 /* *INDENT-ON* */
2189
2190 /*
2191  * Hop-by-Hop handling
2192  */
2193 #ifndef CLIB_MARCH_VARIANT
2194 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2195 #endif /* CLIB_MARCH_VARIANT */
2196
2197 #define foreach_ip6_hop_by_hop_error \
2198 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2199 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2200 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2201
2202 /* *INDENT-OFF* */
2203 typedef enum
2204 {
2205 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2206   foreach_ip6_hop_by_hop_error
2207 #undef _
2208   IP6_HOP_BY_HOP_N_ERROR,
2209 } ip6_hop_by_hop_error_t;
2210 /* *INDENT-ON* */
2211
2212 /*
2213  * Primary h-b-h handler trace support
2214  * We work pretty hard on the problem for obvious reasons
2215  */
2216 typedef struct
2217 {
2218   u32 next_index;
2219   u32 trace_len;
2220   u8 option_data[256];
2221 } ip6_hop_by_hop_trace_t;
2222
2223 extern vlib_node_registration_t ip6_hop_by_hop_node;
2224
2225 static char *ip6_hop_by_hop_error_strings[] = {
2226 #define _(sym,string) string,
2227   foreach_ip6_hop_by_hop_error
2228 #undef _
2229 };
2230
2231 #ifndef CLIB_MARCH_VARIANT
2232 u8 *
2233 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2234 {
2235   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2236   int total_len = va_arg (*args, int);
2237   ip6_hop_by_hop_option_t *opt0, *limit0;
2238   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2239   u8 type0;
2240
2241   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2242               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2243
2244   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2245   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2246
2247   while (opt0 < limit0)
2248     {
2249       type0 = opt0->type;
2250       switch (type0)
2251         {
2252         case 0:         /* Pad, just stop */
2253           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2254           break;
2255
2256         default:
2257           if (hm->trace[type0])
2258             {
2259               s = (*hm->trace[type0]) (s, opt0);
2260             }
2261           else
2262             {
2263               s =
2264                 format (s, "\n    unrecognized option %d length %d", type0,
2265                         opt0->length);
2266             }
2267           opt0 =
2268             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2269                                          sizeof (ip6_hop_by_hop_option_t));
2270           break;
2271         }
2272     }
2273   return s;
2274 }
2275 #endif
2276
2277 static u8 *
2278 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2279 {
2280   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2281   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2282   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2283   ip6_hop_by_hop_header_t *hbh0;
2284   ip6_hop_by_hop_option_t *opt0, *limit0;
2285   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2286
2287   u8 type0;
2288
2289   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2290
2291   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2292               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2293
2294   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2295   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2296
2297   while (opt0 < limit0)
2298     {
2299       type0 = opt0->type;
2300       switch (type0)
2301         {
2302         case 0:         /* Pad, just stop */
2303           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2304           break;
2305
2306         default:
2307           if (hm->trace[type0])
2308             {
2309               s = (*hm->trace[type0]) (s, opt0);
2310             }
2311           else
2312             {
2313               s =
2314                 format (s, "\n    unrecognized option %d length %d", type0,
2315                         opt0->length);
2316             }
2317           opt0 =
2318             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2319                                          sizeof (ip6_hop_by_hop_option_t));
2320           break;
2321         }
2322     }
2323   return s;
2324 }
2325
2326 always_inline u8
2327 ip6_scan_hbh_options (vlib_buffer_t * b0,
2328                       ip6_header_t * ip0,
2329                       ip6_hop_by_hop_header_t * hbh0,
2330                       ip6_hop_by_hop_option_t * opt0,
2331                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2332 {
2333   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2334   u8 type0;
2335   u8 error0 = 0;
2336
2337   while (opt0 < limit0)
2338     {
2339       type0 = opt0->type;
2340       switch (type0)
2341         {
2342         case 0:         /* Pad1 */
2343           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2344           continue;
2345         case 1:         /* PadN */
2346           break;
2347         default:
2348           if (hm->options[type0])
2349             {
2350               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2351                 {
2352                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2353                   return (error0);
2354                 }
2355             }
2356           else
2357             {
2358               /* Unrecognized mandatory option, check the two high order bits */
2359               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2360                 {
2361                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2362                   break;
2363                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2364                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2365                   *next0 = IP_LOOKUP_NEXT_DROP;
2366                   break;
2367                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2368                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2369                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2370                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2371                                                ICMP6_parameter_problem_unrecognized_option,
2372                                                (u8 *) opt0 - (u8 *) ip0);
2373                   break;
2374                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2375                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2376                   if (!ip6_address_is_multicast (&ip0->dst_address))
2377                     {
2378                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2379                       icmp6_error_set_vnet_buffer (b0,
2380                                                    ICMP6_parameter_problem,
2381                                                    ICMP6_parameter_problem_unrecognized_option,
2382                                                    (u8 *) opt0 - (u8 *) ip0);
2383                     }
2384                   else
2385                     {
2386                       *next0 = IP_LOOKUP_NEXT_DROP;
2387                     }
2388                   break;
2389                 }
2390               return (error0);
2391             }
2392         }
2393       opt0 =
2394         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2395                                      sizeof (ip6_hop_by_hop_option_t));
2396     }
2397   return (error0);
2398 }
2399
2400 /*
2401  * Process the Hop-by-Hop Options header
2402  */
2403 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2404                                     vlib_node_runtime_t * node,
2405                                     vlib_frame_t * frame)
2406 {
2407   vlib_node_runtime_t *error_node =
2408     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2409   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2410   u32 n_left_from, *from, *to_next;
2411   ip_lookup_next_t next_index;
2412
2413   from = vlib_frame_vector_args (frame);
2414   n_left_from = frame->n_vectors;
2415   next_index = node->cached_next_index;
2416
2417   while (n_left_from > 0)
2418     {
2419       u32 n_left_to_next;
2420
2421       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2422
2423       while (n_left_from >= 4 && n_left_to_next >= 2)
2424         {
2425           u32 bi0, bi1;
2426           vlib_buffer_t *b0, *b1;
2427           u32 next0, next1;
2428           ip6_header_t *ip0, *ip1;
2429           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2430           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2431           u8 error0 = 0, error1 = 0;
2432
2433           /* Prefetch next iteration. */
2434           {
2435             vlib_buffer_t *p2, *p3;
2436
2437             p2 = vlib_get_buffer (vm, from[2]);
2438             p3 = vlib_get_buffer (vm, from[3]);
2439
2440             vlib_prefetch_buffer_header (p2, LOAD);
2441             vlib_prefetch_buffer_header (p3, LOAD);
2442
2443             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2444             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2445           }
2446
2447           /* Speculatively enqueue b0, b1 to the current next frame */
2448           to_next[0] = bi0 = from[0];
2449           to_next[1] = bi1 = from[1];
2450           from += 2;
2451           to_next += 2;
2452           n_left_from -= 2;
2453           n_left_to_next -= 2;
2454
2455           b0 = vlib_get_buffer (vm, bi0);
2456           b1 = vlib_get_buffer (vm, bi1);
2457
2458           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2459           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2460           ip_adjacency_t *adj0 = adj_get (adj_index0);
2461           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2462           ip_adjacency_t *adj1 = adj_get (adj_index1);
2463
2464           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2465           next0 = adj0->lookup_next_index;
2466           next1 = adj1->lookup_next_index;
2467
2468           ip0 = vlib_buffer_get_current (b0);
2469           ip1 = vlib_buffer_get_current (b1);
2470           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2471           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2472           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2473           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2474           limit0 =
2475             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2476                                          ((hbh0->length + 1) << 3));
2477           limit1 =
2478             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2479                                          ((hbh1->length + 1) << 3));
2480
2481           /*
2482            * Basic validity checks
2483            */
2484           if ((hbh0->length + 1) << 3 >
2485               clib_net_to_host_u16 (ip0->payload_length))
2486             {
2487               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2488               next0 = IP_LOOKUP_NEXT_DROP;
2489               goto outdual;
2490             }
2491           /* Scan the set of h-b-h options, process ones that we understand */
2492           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2493
2494           if ((hbh1->length + 1) << 3 >
2495               clib_net_to_host_u16 (ip1->payload_length))
2496             {
2497               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2498               next1 = IP_LOOKUP_NEXT_DROP;
2499               goto outdual;
2500             }
2501           /* Scan the set of h-b-h options, process ones that we understand */
2502           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2503
2504         outdual:
2505           /* Has the classifier flagged this buffer for special treatment? */
2506           if (PREDICT_FALSE
2507               ((error0 == 0)
2508                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2509             next0 = hm->next_override;
2510
2511           /* Has the classifier flagged this buffer for special treatment? */
2512           if (PREDICT_FALSE
2513               ((error1 == 0)
2514                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2515             next1 = hm->next_override;
2516
2517           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2518             {
2519               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2520                 {
2521                   ip6_hop_by_hop_trace_t *t =
2522                     vlib_add_trace (vm, node, b0, sizeof (*t));
2523                   u32 trace_len = (hbh0->length + 1) << 3;
2524                   t->next_index = next0;
2525                   /* Capture the h-b-h option verbatim */
2526                   trace_len =
2527                     trace_len <
2528                     ARRAY_LEN (t->option_data) ? trace_len :
2529                     ARRAY_LEN (t->option_data);
2530                   t->trace_len = trace_len;
2531                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2532                 }
2533               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2534                 {
2535                   ip6_hop_by_hop_trace_t *t =
2536                     vlib_add_trace (vm, node, b1, sizeof (*t));
2537                   u32 trace_len = (hbh1->length + 1) << 3;
2538                   t->next_index = next1;
2539                   /* Capture the h-b-h option verbatim */
2540                   trace_len =
2541                     trace_len <
2542                     ARRAY_LEN (t->option_data) ? trace_len :
2543                     ARRAY_LEN (t->option_data);
2544                   t->trace_len = trace_len;
2545                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2546                 }
2547
2548             }
2549
2550           b0->error = error_node->errors[error0];
2551           b1->error = error_node->errors[error1];
2552
2553           /* verify speculative enqueue, maybe switch current next frame */
2554           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2555                                            n_left_to_next, bi0, bi1, next0,
2556                                            next1);
2557         }
2558
2559       while (n_left_from > 0 && n_left_to_next > 0)
2560         {
2561           u32 bi0;
2562           vlib_buffer_t *b0;
2563           u32 next0;
2564           ip6_header_t *ip0;
2565           ip6_hop_by_hop_header_t *hbh0;
2566           ip6_hop_by_hop_option_t *opt0, *limit0;
2567           u8 error0 = 0;
2568
2569           /* Speculatively enqueue b0 to the current next frame */
2570           bi0 = from[0];
2571           to_next[0] = bi0;
2572           from += 1;
2573           to_next += 1;
2574           n_left_from -= 1;
2575           n_left_to_next -= 1;
2576
2577           b0 = vlib_get_buffer (vm, bi0);
2578           /*
2579            * Default use the next_index from the adjacency.
2580            * A HBH option rarely redirects to a different node
2581            */
2582           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2583           ip_adjacency_t *adj0 = adj_get (adj_index0);
2584           next0 = adj0->lookup_next_index;
2585
2586           ip0 = vlib_buffer_get_current (b0);
2587           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2588           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2589           limit0 =
2590             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2591                                          ((hbh0->length + 1) << 3));
2592
2593           /*
2594            * Basic validity checks
2595            */
2596           if ((hbh0->length + 1) << 3 >
2597               clib_net_to_host_u16 (ip0->payload_length))
2598             {
2599               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2600               next0 = IP_LOOKUP_NEXT_DROP;
2601               goto out0;
2602             }
2603
2604           /* Scan the set of h-b-h options, process ones that we understand */
2605           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2606
2607         out0:
2608           /* Has the classifier flagged this buffer for special treatment? */
2609           if (PREDICT_FALSE
2610               ((error0 == 0)
2611                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2612             next0 = hm->next_override;
2613
2614           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2615             {
2616               ip6_hop_by_hop_trace_t *t =
2617                 vlib_add_trace (vm, node, b0, sizeof (*t));
2618               u32 trace_len = (hbh0->length + 1) << 3;
2619               t->next_index = next0;
2620               /* Capture the h-b-h option verbatim */
2621               trace_len =
2622                 trace_len <
2623                 ARRAY_LEN (t->option_data) ? trace_len :
2624                 ARRAY_LEN (t->option_data);
2625               t->trace_len = trace_len;
2626               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2627             }
2628
2629           b0->error = error_node->errors[error0];
2630
2631           /* verify speculative enqueue, maybe switch current next frame */
2632           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2633                                            n_left_to_next, bi0, next0);
2634         }
2635       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2636     }
2637   return frame->n_vectors;
2638 }
2639
2640 /* *INDENT-OFF* */
2641 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2642 {
2643   .name = "ip6-hop-by-hop",
2644   .sibling_of = "ip6-lookup",
2645   .vector_size = sizeof (u32),
2646   .format_trace = format_ip6_hop_by_hop_trace,
2647   .type = VLIB_NODE_TYPE_INTERNAL,
2648   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2649   .error_strings = ip6_hop_by_hop_error_strings,
2650   .n_next_nodes = 0,
2651 };
2652 /* *INDENT-ON* */
2653
2654 static clib_error_t *
2655 ip6_hop_by_hop_init (vlib_main_t * vm)
2656 {
2657   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2658   clib_memset (hm->options, 0, sizeof (hm->options));
2659   clib_memset (hm->trace, 0, sizeof (hm->trace));
2660   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2661   return (0);
2662 }
2663
2664 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2665
2666 #ifndef CLIB_MARCH_VARIANT
2667 void
2668 ip6_hbh_set_next_override (uword next)
2669 {
2670   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2671
2672   hm->next_override = next;
2673 }
2674
2675 int
2676 ip6_hbh_register_option (u8 option,
2677                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2678                                       ip6_hop_by_hop_option_t * opt),
2679                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2680 {
2681   ip6_main_t *im = &ip6_main;
2682   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2683
2684   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2685
2686   /* Already registered */
2687   if (hm->options[option])
2688     return (-1);
2689
2690   hm->options[option] = options;
2691   hm->trace[option] = trace;
2692
2693   /* Set global variable */
2694   im->hbh_enabled = 1;
2695
2696   return (0);
2697 }
2698
2699 int
2700 ip6_hbh_unregister_option (u8 option)
2701 {
2702   ip6_main_t *im = &ip6_main;
2703   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2704
2705   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2706
2707   /* Not registered */
2708   if (!hm->options[option])
2709     return (-1);
2710
2711   hm->options[option] = NULL;
2712   hm->trace[option] = NULL;
2713
2714   /* Disable global knob if this was the last option configured */
2715   int i;
2716   bool found = false;
2717   for (i = 0; i < 256; i++)
2718     {
2719       if (hm->options[option])
2720         {
2721           found = true;
2722           break;
2723         }
2724     }
2725   if (!found)
2726     im->hbh_enabled = 0;
2727
2728   return (0);
2729 }
2730
2731 /* Global IP6 main. */
2732 ip6_main_t ip6_main;
2733 #endif
2734
2735 static clib_error_t *
2736 ip6_lookup_init (vlib_main_t * vm)
2737 {
2738   ip6_main_t *im = &ip6_main;
2739   clib_error_t *error;
2740   uword i;
2741
2742   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2743     return error;
2744
2745   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2746     {
2747       u32 j, i0, i1;
2748
2749       i0 = i / 32;
2750       i1 = i % 32;
2751
2752       for (j = 0; j < i0; j++)
2753         im->fib_masks[i].as_u32[j] = ~0;
2754
2755       if (i1)
2756         im->fib_masks[i].as_u32[i0] =
2757           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2758     }
2759
2760   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2761
2762   if (im->lookup_table_nbuckets == 0)
2763     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2764
2765   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2766
2767   if (im->lookup_table_size == 0)
2768     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2769
2770   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2771                          "ip6 FIB fwding table",
2772                          im->lookup_table_nbuckets, im->lookup_table_size);
2773   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2774                          "ip6 FIB non-fwding table",
2775                          im->lookup_table_nbuckets, im->lookup_table_size);
2776   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2777                          "ip6 mFIB table",
2778                          im->lookup_table_nbuckets, im->lookup_table_size);
2779
2780   /* Create FIB with index 0 and table id of 0. */
2781   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2782                                      FIB_SOURCE_DEFAULT_ROUTE);
2783   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2784                                       MFIB_SOURCE_DEFAULT_ROUTE);
2785
2786   {
2787     pg_node_t *pn;
2788     pn = pg_get_node (ip6_lookup_node.index);
2789     pn->unformat_edit = unformat_pg_ip6_header;
2790   }
2791
2792   /* Unless explicitly configured, don't process HBH options */
2793   im->hbh_enabled = 0;
2794
2795   {
2796     icmp6_neighbor_solicitation_header_t p;
2797
2798     clib_memset (&p, 0, sizeof (p));
2799
2800     p.ip.ip_version_traffic_class_and_flow_label =
2801       clib_host_to_net_u32 (0x6 << 28);
2802     p.ip.payload_length =
2803       clib_host_to_net_u16 (sizeof (p) -
2804                             STRUCT_OFFSET_OF
2805                             (icmp6_neighbor_solicitation_header_t, neighbor));
2806     p.ip.protocol = IP_PROTOCOL_ICMP6;
2807     p.ip.hop_limit = 255;
2808     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2809
2810     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2811
2812     p.link_layer_option.header.type =
2813       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2814     p.link_layer_option.header.n_data_u64s =
2815       sizeof (p.link_layer_option) / sizeof (u64);
2816
2817     vlib_packet_template_init (vm,
2818                                &im->discover_neighbor_packet_template,
2819                                &p, sizeof (p),
2820                                /* alloc chunk size */ 8,
2821                                "ip6 neighbor discovery");
2822   }
2823
2824   return error;
2825 }
2826
2827 VLIB_INIT_FUNCTION (ip6_lookup_init);
2828
2829 static clib_error_t *
2830 test_ip6_link_command_fn (vlib_main_t * vm,
2831                           unformat_input_t * input, vlib_cli_command_t * cmd)
2832 {
2833   u8 mac[6];
2834   ip6_address_t _a, *a = &_a;
2835
2836   if (unformat (input, "%U", unformat_ethernet_address, mac))
2837     {
2838       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2839       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2840       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2841       vlib_cli_output (vm, "Original MAC address: %U",
2842                        format_ethernet_address, mac);
2843     }
2844
2845   return 0;
2846 }
2847
2848 /*?
2849  * This command converts the given MAC Address into an IPv6 link-local
2850  * address.
2851  *
2852  * @cliexpar
2853  * Example of how to create an IPv6 link-local address:
2854  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2855  * Link local address: fe80::14d9:e0ff:fe91:7986
2856  * Original MAC address: 16:d9:e0:91:79:86
2857  * @cliexend
2858 ?*/
2859 /* *INDENT-OFF* */
2860 VLIB_CLI_COMMAND (test_link_command, static) =
2861 {
2862   .path = "test ip6 link",
2863   .function = test_ip6_link_command_fn,
2864   .short_help = "test ip6 link <mac-address>",
2865 };
2866 /* *INDENT-ON* */
2867
2868 #ifndef CLIB_MARCH_VARIANT
2869 int
2870 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2871 {
2872   u32 fib_index;
2873
2874   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2875
2876   if (~0 == fib_index)
2877     return VNET_API_ERROR_NO_SUCH_FIB;
2878
2879   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2880                                   flow_hash_config);
2881
2882   return 0;
2883 }
2884 #endif
2885
2886 static clib_error_t *
2887 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2888                               unformat_input_t * input,
2889                               vlib_cli_command_t * cmd)
2890 {
2891   int matched = 0;
2892   u32 table_id = 0;
2893   u32 flow_hash_config = 0;
2894   int rv;
2895
2896   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2897     {
2898       if (unformat (input, "table %d", &table_id))
2899         matched = 1;
2900 #define _(a,v) \
2901     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2902       foreach_flow_hash_bit
2903 #undef _
2904         else
2905         break;
2906     }
2907
2908   if (matched == 0)
2909     return clib_error_return (0, "unknown input `%U'",
2910                               format_unformat_error, input);
2911
2912   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2913   switch (rv)
2914     {
2915     case 0:
2916       break;
2917
2918     case -1:
2919       return clib_error_return (0, "no such FIB table %d", table_id);
2920
2921     default:
2922       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2923       break;
2924     }
2925
2926   return 0;
2927 }
2928
2929 /*?
2930  * Configure the set of IPv6 fields used by the flow hash.
2931  *
2932  * @cliexpar
2933  * @parblock
2934  * Example of how to set the flow hash on a given table:
2935  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2936  *
2937  * Example of display the configured flow hash:
2938  * @cliexstart{show ip6 fib}
2939  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2940  * @::/0
2941  *   unicast-ip6-chain
2942  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2943  *     [0] [@0]: dpo-drop ip6
2944  * fe80::/10
2945  *   unicast-ip6-chain
2946  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2947  *     [0] [@2]: dpo-receive
2948  * ff02::1/128
2949  *   unicast-ip6-chain
2950  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2951  *     [0] [@2]: dpo-receive
2952  * ff02::2/128
2953  *   unicast-ip6-chain
2954  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2955  *     [0] [@2]: dpo-receive
2956  * ff02::16/128
2957  *   unicast-ip6-chain
2958  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2959  *     [0] [@2]: dpo-receive
2960  * ff02::1:ff00:0/104
2961  *   unicast-ip6-chain
2962  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2963  *     [0] [@2]: dpo-receive
2964  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2965  * @::/0
2966  *   unicast-ip6-chain
2967  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2968  *     [0] [@0]: dpo-drop ip6
2969  * @::a:1:1:0:4/126
2970  *   unicast-ip6-chain
2971  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2972  *     [0] [@4]: ipv6-glean: af_packet0
2973  * @::a:1:1:0:7/128
2974  *   unicast-ip6-chain
2975  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2976  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2977  * fe80::/10
2978  *   unicast-ip6-chain
2979  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2980  *     [0] [@2]: dpo-receive
2981  * fe80::fe:3eff:fe3e:9222/128
2982  *   unicast-ip6-chain
2983  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2984  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2985  * ff02::1/128
2986  *   unicast-ip6-chain
2987  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2988  *     [0] [@2]: dpo-receive
2989  * ff02::2/128
2990  *   unicast-ip6-chain
2991  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2992  *     [0] [@2]: dpo-receive
2993  * ff02::16/128
2994  *   unicast-ip6-chain
2995  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2996  *     [0] [@2]: dpo-receive
2997  * ff02::1:ff00:0/104
2998  *   unicast-ip6-chain
2999  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
3000  *     [0] [@2]: dpo-receive
3001  * @cliexend
3002  * @endparblock
3003 ?*/
3004 /* *INDENT-OFF* */
3005 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
3006 {
3007   .path = "set ip6 flow-hash",
3008   .short_help =
3009   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3010   .function = set_ip6_flow_hash_command_fn,
3011 };
3012 /* *INDENT-ON* */
3013
3014 static clib_error_t *
3015 show_ip6_local_command_fn (vlib_main_t * vm,
3016                            unformat_input_t * input, vlib_cli_command_t * cmd)
3017 {
3018   ip6_main_t *im = &ip6_main;
3019   ip_lookup_main_t *lm = &im->lookup_main;
3020   int i;
3021
3022   vlib_cli_output (vm, "Protocols handled by ip6_local");
3023   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
3024     {
3025       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3026         {
3027
3028           u32 node_index = vlib_get_node (vm,
3029                                           ip6_local_node.index)->
3030             next_nodes[lm->local_next_by_ip_protocol[i]];
3031           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
3032                            node_index);
3033         }
3034     }
3035   return 0;
3036 }
3037
3038
3039
3040 /*?
3041  * Display the set of protocols handled by the local IPv6 stack.
3042  *
3043  * @cliexpar
3044  * Example of how to display local protocol table:
3045  * @cliexstart{show ip6 local}
3046  * Protocols handled by ip6_local
3047  * 17
3048  * 43
3049  * 58
3050  * 115
3051  * @cliexend
3052 ?*/
3053 /* *INDENT-OFF* */
3054 VLIB_CLI_COMMAND (show_ip6_local, static) =
3055 {
3056   .path = "show ip6 local",
3057   .function = show_ip6_local_command_fn,
3058   .short_help = "show ip6 local",
3059 };
3060 /* *INDENT-ON* */
3061
3062 #ifndef CLIB_MARCH_VARIANT
3063 int
3064 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3065                              u32 table_index)
3066 {
3067   vnet_main_t *vnm = vnet_get_main ();
3068   vnet_interface_main_t *im = &vnm->interface_main;
3069   ip6_main_t *ipm = &ip6_main;
3070   ip_lookup_main_t *lm = &ipm->lookup_main;
3071   vnet_classify_main_t *cm = &vnet_classify_main;
3072   ip6_address_t *if_addr;
3073
3074   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3075     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3076
3077   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3078     return VNET_API_ERROR_NO_SUCH_ENTRY;
3079
3080   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3081   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3082
3083   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3084
3085   if (NULL != if_addr)
3086     {
3087       fib_prefix_t pfx = {
3088         .fp_len = 128,
3089         .fp_proto = FIB_PROTOCOL_IP6,
3090         .fp_addr.ip6 = *if_addr,
3091       };
3092       u32 fib_index;
3093
3094       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3095                                                        sw_if_index);
3096
3097
3098       if (table_index != (u32) ~ 0)
3099         {
3100           dpo_id_t dpo = DPO_INVALID;
3101
3102           dpo_set (&dpo,
3103                    DPO_CLASSIFY,
3104                    DPO_PROTO_IP6,
3105                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3106
3107           fib_table_entry_special_dpo_add (fib_index,
3108                                            &pfx,
3109                                            FIB_SOURCE_CLASSIFY,
3110                                            FIB_ENTRY_FLAG_NONE, &dpo);
3111           dpo_reset (&dpo);
3112         }
3113       else
3114         {
3115           fib_table_entry_special_remove (fib_index,
3116                                           &pfx, FIB_SOURCE_CLASSIFY);
3117         }
3118     }
3119
3120   return 0;
3121 }
3122 #endif
3123
3124 static clib_error_t *
3125 set_ip6_classify_command_fn (vlib_main_t * vm,
3126                              unformat_input_t * input,
3127                              vlib_cli_command_t * cmd)
3128 {
3129   u32 table_index = ~0;
3130   int table_index_set = 0;
3131   u32 sw_if_index = ~0;
3132   int rv;
3133
3134   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3135     {
3136       if (unformat (input, "table-index %d", &table_index))
3137         table_index_set = 1;
3138       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3139                          vnet_get_main (), &sw_if_index))
3140         ;
3141       else
3142         break;
3143     }
3144
3145   if (table_index_set == 0)
3146     return clib_error_return (0, "classify table-index must be specified");
3147
3148   if (sw_if_index == ~0)
3149     return clib_error_return (0, "interface / subif must be specified");
3150
3151   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3152
3153   switch (rv)
3154     {
3155     case 0:
3156       break;
3157
3158     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3159       return clib_error_return (0, "No such interface");
3160
3161     case VNET_API_ERROR_NO_SUCH_ENTRY:
3162       return clib_error_return (0, "No such classifier table");
3163     }
3164   return 0;
3165 }
3166
3167 /*?
3168  * Assign a classification table to an interface. The classification
3169  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3170  * commands. Once the table is create, use this command to filter packets
3171  * on an interface.
3172  *
3173  * @cliexpar
3174  * Example of how to assign a classification table to an interface:
3175  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3176 ?*/
3177 /* *INDENT-OFF* */
3178 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3179 {
3180   .path = "set ip6 classify",
3181   .short_help =
3182   "set ip6 classify intfc <interface> table-index <classify-idx>",
3183   .function = set_ip6_classify_command_fn,
3184 };
3185 /* *INDENT-ON* */
3186
3187 static clib_error_t *
3188 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3189 {
3190   ip6_main_t *im = &ip6_main;
3191   uword heapsize = 0;
3192   u32 tmp;
3193   u32 nbuckets = 0;
3194
3195   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3196     {
3197       if (unformat (input, "hash-buckets %d", &tmp))
3198         nbuckets = tmp;
3199       else if (unformat (input, "heap-size %U",
3200                          unformat_memory_size, &heapsize))
3201         ;
3202       else
3203         return clib_error_return (0, "unknown input '%U'",
3204                                   format_unformat_error, input);
3205     }
3206
3207   im->lookup_table_nbuckets = nbuckets;
3208   im->lookup_table_size = heapsize;
3209
3210   return 0;
3211 }
3212
3213 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3214
3215 /*
3216  * fd.io coding-style-patch-verification: ON
3217  *
3218  * Local Variables:
3219  * eval: (c-set-style "gnu")
3220  * End:
3221  */