src/vnet/ip/ip6_forward.c

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