src/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ip/ip_frag.h>
  43 #include <vnet/ip/ip6_neighbor.h>
  44 #include <vnet/ethernet/ethernet.h>     /* for ethernet_header_t */
  45 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  46 #include <vppinfra/cache.h>
  47 #include <vnet/fib/fib_urpf_list.h>     /* for FIB uRPF check */
  48 #include <vnet/fib/ip6_fib.h>
  49 #include <vnet/mfib/ip6_mfib.h>
  50 #include <vnet/dpo/load_balance_map.h>
  51 #include <vnet/dpo/classify_dpo.h>
  52
  53 #ifndef CLIB_MARCH_VARIANT
  54 #include <vppinfra/bihash_template.c>
  55 #endif
  56 #include <vnet/ip/ip6_forward.h>
  57 #include <vnet/interface_output.h>
  58
  59 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  60 #define OI_DECAP   0x80000000
  61
  62 static void
  63 ip6_add_interface_prefix_routes (ip6_main_t * im,
  64                                  u32 sw_if_index,
  65                                  u32 fib_index,
  66                                  ip6_address_t * address, u32 address_length)
  67 {
  68   ip_lookup_main_t *lm = &im->lookup_main;
  69   ip_interface_prefix_t *if_prefix;
  70
  71   /* *INDENT-OFF* */
  72   ip_interface_prefix_key_t key = {
  73     .prefix = {
  74       .fp_len = address_length,
  75       .fp_proto = FIB_PROTOCOL_IP6,
  76       .fp_addr.ip6 = {
  77         .as_u64 = {
  78           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
  79           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
  80         },
  81       },
  82     },
  83     .sw_if_index = sw_if_index,
  84   };
  85   /* *INDENT-ON* */
  86
  87   /* If prefix already set on interface, just increment ref count & return */
  88   if_prefix = ip_get_interface_prefix (lm, &key);
  89   if (if_prefix)
  90     {
  91       if_prefix->ref_count += 1;
  92       return;
  93     }
  94
  95   /* New prefix - allocate a pool entry, initialize it, add to the hash */
  96   pool_get (lm->if_prefix_pool, if_prefix);
  97   if_prefix->ref_count = 1;
  98   clib_memcpy (&if_prefix->key, &key, sizeof (key));
  99   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 100              if_prefix - lm->if_prefix_pool, 0 /* old value */ );
 101
 102   /* length < 128 - add glean */
 103   if (address_length < 128)
 104     {
 105       /* set the glean route for the prefix */
 106       fib_table_entry_update_one_path (fib_index, &key.prefix,
 107                                        FIB_SOURCE_INTERFACE,
 108                                        (FIB_ENTRY_FLAG_CONNECTED |
 109                                         FIB_ENTRY_FLAG_ATTACHED),
 110                                        DPO_PROTO_IP6,
 111                                        /* No next-hop address */
 112                                        NULL, sw_if_index,
 113                                        /* invalid FIB index */
 114                                        ~0, 1,
 115                                        /* no out-label stack */
 116                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
 117     }
 118 }
 119
 120 static void
 121 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 122                           ip6_main_t * im, u32 fib_index,
 123                           ip_interface_address_t * a)
 124 {
 125   ip_lookup_main_t *lm = &im->lookup_main;
 126   ip6_address_t *address = ip_interface_address_get_address (lm, a);
 127   fib_prefix_t pfx = {
 128     .fp_len = a->address_length,
 129     .fp_proto = FIB_PROTOCOL_IP6,
 130     .fp_addr.ip6 = *address,
 131   };
 132
 133   /* set special routes for the prefix if needed */
 134   ip6_add_interface_prefix_routes (im, sw_if_index, fib_index,
 135                                    address, a->address_length);
 136
 137   pfx.fp_len = 128;
 138   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 139     {
 140       u32 classify_table_index =
 141         lm->classify_table_index_by_sw_if_index[sw_if_index];
 142       if (classify_table_index != (u32) ~ 0)
 143         {
 144           dpo_id_t dpo = DPO_INVALID;
 145
 146           dpo_set (&dpo,
 147                    DPO_CLASSIFY,
 148                    DPO_PROTO_IP6,
 149                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 150
 151           fib_table_entry_special_dpo_add (fib_index,
 152                                            &pfx,
 153                                            FIB_SOURCE_CLASSIFY,
 154                                            FIB_ENTRY_FLAG_NONE, &dpo);
 155           dpo_reset (&dpo);
 156         }
 157     }
 158
 159   fib_table_entry_update_one_path (fib_index, &pfx,
 160                                    FIB_SOURCE_INTERFACE,
 161                                    (FIB_ENTRY_FLAG_CONNECTED |
 162                                     FIB_ENTRY_FLAG_LOCAL),
 163                                    DPO_PROTO_IP6,
 164                                    &pfx.fp_addr,
 165                                    sw_if_index, ~0,
 166                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 167 }
 168
 169 static void
 170 ip6_del_interface_prefix_routes (ip6_main_t * im,
 171                                  u32 sw_if_index,
 172                                  u32 fib_index,
 173                                  ip6_address_t * address, u32 address_length)
 174 {
 175   ip_lookup_main_t *lm = &im->lookup_main;
 176   ip_interface_prefix_t *if_prefix;
 177
 178   /* *INDENT-OFF* */
 179   ip_interface_prefix_key_t key = {
 180     .prefix = {
 181       .fp_len = address_length,
 182       .fp_proto = FIB_PROTOCOL_IP6,
 183       .fp_addr.ip6 = {
 184         .as_u64 = {
 185           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
 186           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
 187         },
 188       },
 189     },
 190     .sw_if_index = sw_if_index,
 191   };
 192   /* *INDENT-ON* */
 193
 194   if_prefix = ip_get_interface_prefix (lm, &key);
 195   if (!if_prefix)
 196     {
 197       clib_warning ("Prefix not found while deleting %U",
 198                     format_ip4_address_and_length, address, address_length);
 199       return;
 200     }
 201
 202   /* If not deleting last intf addr in prefix, decrement ref count & return */
 203   if_prefix->ref_count -= 1;
 204   if (if_prefix->ref_count > 0)
 205     return;
 206
 207   /* length <= 128, delete glean route */
 208   if (address_length <= 128)
 209     {
 210       /* remove glean route for prefix */
 211       fib_table_entry_delete (fib_index, &key.prefix, FIB_SOURCE_INTERFACE);
 212     }
 213
 214   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */ );
 215   pool_put (lm->if_prefix_pool, if_prefix);
 216 }
 217
 218 static void
 219 ip6_del_interface_routes (u32 sw_if_index, ip6_main_t * im,
 220                           u32 fib_index,
 221                           ip6_address_t * address, u32 address_length)
 222 {
 223   fib_prefix_t pfx = {
 224     .fp_len = 128,
 225     .fp_proto = FIB_PROTOCOL_IP6,
 226     .fp_addr.ip6 = *address,
 227   };
 228
 229   /* delete special routes for the prefix if needed */
 230   ip6_del_interface_prefix_routes (im, sw_if_index, fib_index,
 231                                    address, address_length);
 232
 233   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 234 }
 235
 236 #ifndef CLIB_MARCH_VARIANT
 237 void
 238 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 239 {
 240   ip6_main_t *im = &ip6_main;
 241
 242   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 243
 244   /*
 245    * enable/disable only on the 1<->0 transition
 246    */
 247   if (is_enable)
 248     {
 249       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 250         return;
 251     }
 252   else
 253     {
 254       /* The ref count is 0 when an address is removed from an interface that has
 255        * no address - this is not a ciritical error */
 256       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 257           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 258         return;
 259     }
 260
 261   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 262                                !is_enable, 0, 0);
 263
 264   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 265                                sw_if_index, !is_enable, 0, 0);
 266 }
 267
 268 /* get first interface address */
 269 ip6_address_t *
 270 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 271 {
 272   ip_lookup_main_t *lm = &im->lookup_main;
 273   ip_interface_address_t *ia = 0;
 274   ip6_address_t *result = 0;
 275
 276   /* *INDENT-OFF* */
 277   foreach_ip_interface_address (lm, ia, sw_if_index,
 278                                 1 /* honor unnumbered */,
 279   ({
 280     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 281     result = a;
 282     break;
 283   }));
 284   /* *INDENT-ON* */
 285   return result;
 286 }
 287
 288 clib_error_t *
 289 ip6_add_del_interface_address (vlib_main_t * vm,
 290                                u32 sw_if_index,
 291                                ip6_address_t * address,
 292                                u32 address_length, u32 is_del)
 293 {
 294   vnet_main_t *vnm = vnet_get_main ();
 295   ip6_main_t *im = &ip6_main;
 296   ip_lookup_main_t *lm = &im->lookup_main;
 297   clib_error_t *error;
 298   u32 if_address_index;
 299   ip6_address_fib_t ip6_af, *addr_fib = 0;
 300   ip6_address_t ll_addr;
 301
 302   /* local0 interface doesn't support IP addressing */
 303   if (sw_if_index == 0)
 304     {
 305       return
 306         clib_error_create ("local0 interface doesn't support IP addressing");
 307     }
 308
 309   if (ip6_address_is_link_local_unicast (address))
 310     {
 311       if (address_length != 128)
 312         {
 313           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 314           return
 315             clib_error_create
 316             ("prefix length of link-local address must be 128");
 317         }
 318       if (!is_del)
 319         {
 320           return ip6_neighbor_set_link_local_address (vm, sw_if_index,
 321                                                       address);
 322         }
 323       else
 324         {
 325           ll_addr = ip6_neighbor_get_link_local_address (sw_if_index);
 326           if (ip6_address_is_equal (&ll_addr, address))
 327             {
 328               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 329               return clib_error_create ("address not deletable");
 330             }
 331           else
 332             {
 333               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 334               return clib_error_create ("address not found");
 335             }
 336         }
 337     }
 338
 339   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 340   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 341
 342   ip6_addr_fib_init (&ip6_af, address,
 343                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 344   vec_add1 (addr_fib, ip6_af);
 345
 346   /* *INDENT-OFF* */
 347   if (!is_del)
 348     {
 349       /* When adding an address check that it does not conflict
 350          with an existing address on any interface in this table. */
 351       ip_interface_address_t *ia;
 352       vnet_sw_interface_t *sif;
 353
 354       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 355       ({
 356           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 357               im->fib_index_by_sw_if_index[sif->sw_if_index])
 358             {
 359               foreach_ip_interface_address
 360                 (&im->lookup_main, ia, sif->sw_if_index,
 361                  0 /* honor unnumbered */ ,
 362                  ({
 363                    ip6_address_t * x =
 364                      ip_interface_address_get_address
 365                      (&im->lookup_main, ia);
 366                    if (ip6_destination_matches_route
 367                        (im, address, x, ia->address_length) ||
 368                        ip6_destination_matches_route (im,
 369                                                       x,
 370                                                       address,
 371                                                       address_length))
 372                      {
 373                        /* an intf may have >1 addr from the same prefix */
 374                        if ((sw_if_index == sif->sw_if_index) &&
 375                            (ia->address_length == address_length) &&
 376                            !ip6_address_is_equal (x, address))
 377                          continue;
 378
 379                        /* error if the length or intf was different */
 380                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 381                        return
 382                          clib_error_create
 383                          ("failed to add %U which conflicts with %U for interface %U",
 384                           format_ip6_address_and_length, address,
 385                           address_length,
 386                           format_ip6_address_and_length, x,
 387                           ia->address_length,
 388                           format_vnet_sw_if_index_name, vnm,
 389                           sif->sw_if_index);
 390                      }
 391                  }));
 392             }
 393       }));
 394     }
 395   /* *INDENT-ON* */
 396
 397   {
 398     uword elts_before = pool_elts (lm->if_address_pool);
 399
 400     error = ip_interface_address_add_del
 401       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 402     if (error)
 403       goto done;
 404
 405     /* Pool did not grow: add duplicate address. */
 406     if (elts_before == pool_elts (lm->if_address_pool))
 407       goto done;
 408   }
 409
 410   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 411
 412   /* intf addr routes are added/deleted on admin up/down */
 413   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 414     {
 415       if (is_del)
 416         ip6_del_interface_routes (sw_if_index,
 417                                   im, ip6_af.fib_index, address,
 418                                   address_length);
 419       else
 420         ip6_add_interface_routes (vnm, sw_if_index,
 421                                   im, ip6_af.fib_index,
 422                                   pool_elt_at_index (lm->if_address_pool,
 423                                                      if_address_index));
 424     }
 425   {
 426     ip6_add_del_interface_address_callback_t *cb;
 427     vec_foreach (cb, im->add_del_interface_address_callbacks)
 428       cb->function (im, cb->function_opaque, sw_if_index,
 429                     address, address_length, if_address_index, is_del);
 430   }
 431
 432 done:
 433   vec_free (addr_fib);
 434   return error;
 435 }
 436
 437 #endif
 438
 439 static clib_error_t *
 440 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 441 {
 442   ip6_main_t *im = &ip6_main;
 443   ip_interface_address_t *ia;
 444   ip6_address_t *a;
 445   u32 is_admin_up, fib_index;
 446
 447   /* Fill in lookup tables with default table (0). */
 448   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 449
 450   vec_validate_init_empty (im->
 451                            lookup_main.if_address_pool_index_by_sw_if_index,
 452                            sw_if_index, ~0);
 453
 454   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 455
 456   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 457
 458   /* *INDENT-OFF* */
 459   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 460                                 0 /* honor unnumbered */,
 461   ({
 462     a = ip_interface_address_get_address (&im->lookup_main, ia);
 463     if (is_admin_up)
 464       ip6_add_interface_routes (vnm, sw_if_index,
 465                                 im, fib_index,
 466                                 ia);
 467     else
 468       ip6_del_interface_routes (sw_if_index, im, fib_index,
 469                                 a, ia->address_length);
 470   }));
 471   /* *INDENT-ON* */
 472
 473   return 0;
 474 }
 475
 476 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 477
 478 /* Built-in ip6 unicast rx feature path definition */
 479 /* *INDENT-OFF* */
 480 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 481 {
 482   .arc_name  = "ip6-unicast",
 483   .start_nodes = VNET_FEATURES ("ip6-input"),
 484   .last_in_arc = "ip6-lookup",
 485   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 486 };
 487
 488 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 489 {
 490   .arc_name = "ip6-unicast",
 491   .node_name = "ip6-flow-classify",
 492   .runs_before = VNET_FEATURES ("ip6-inacl"),
 493 };
 494
 495 VNET_FEATURE_INIT (ip6_inacl, static) =
 496 {
 497   .arc_name = "ip6-unicast",
 498   .node_name = "ip6-inacl",
 499   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 500 };
 501
 502 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 503 {
 504   .arc_name = "ip6-unicast",
 505   .node_name = "ip6-policer-classify",
 506   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 507 };
 508
 509 VNET_FEATURE_INIT (ip6_ipsec, static) =
 510 {
 511   .arc_name = "ip6-unicast",
 512   .node_name = "ipsec6-input-feature",
 513   .runs_before = VNET_FEATURES ("l2tp-decap"),
 514 };
 515
 516 VNET_FEATURE_INIT (ip6_l2tp, static) =
 517 {
 518   .arc_name = "ip6-unicast",
 519   .node_name = "l2tp-decap",
 520   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 521 };
 522
 523 VNET_FEATURE_INIT (ip6_vpath, static) =
 524 {
 525   .arc_name = "ip6-unicast",
 526   .node_name = "vpath-input-ip6",
 527   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 528 };
 529
 530 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 531 {
 532   .arc_name = "ip6-unicast",
 533   .node_name = "ip6-vxlan-bypass",
 534   .runs_before = VNET_FEATURES ("ip6-lookup"),
 535 };
 536
 537 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 538 {
 539   .arc_name = "ip6-unicast",
 540   .node_name = "ip6-not-enabled",
 541   .runs_before = VNET_FEATURES ("ip6-lookup"),
 542 };
 543
 544 VNET_FEATURE_INIT (ip6_lookup, static) =
 545 {
 546   .arc_name = "ip6-unicast",
 547   .node_name = "ip6-lookup",
 548   .runs_before = 0,  /*last feature*/
 549 };
 550
 551 /* Built-in ip6 multicast rx feature path definition (none now) */
 552 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 553 {
 554   .arc_name  = "ip6-multicast",
 555   .start_nodes = VNET_FEATURES ("ip6-input"),
 556   .last_in_arc = "ip6-mfib-forward-lookup",
 557   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 558 };
 559
 560 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 561   .arc_name = "ip6-multicast",
 562   .node_name = "vpath-input-ip6",
 563   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 564 };
 565
 566 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 567   .arc_name = "ip6-multicast",
 568   .node_name = "ip6-not-enabled",
 569   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 570 };
 571
 572 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 573   .arc_name = "ip6-multicast",
 574   .node_name = "ip6-mfib-forward-lookup",
 575   .runs_before = 0, /* last feature */
 576 };
 577
 578 /* Built-in ip4 tx feature path definition */
 579 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 580 {
 581   .arc_name  = "ip6-output",
 582   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 583   .last_in_arc = "interface-output",
 584   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 585 };
 586
 587 VNET_FEATURE_INIT (ip6_outacl, static) = {
 588   .arc_name = "ip6-output",
 589   .node_name = "ip6-outacl",
 590   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 591 };
 592
 593 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 594   .arc_name = "ip6-output",
 595   .node_name = "ipsec6-output-feature",
 596   .runs_before = VNET_FEATURES ("interface-output"),
 597 };
 598
 599 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 600   .arc_name = "ip6-output",
 601   .node_name = "interface-output",
 602   .runs_before = 0, /* not before any other features */
 603 };
 604 /* *INDENT-ON* */
 605
 606 static clib_error_t *
 607 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 608 {
 609   ip6_main_t *im = &ip6_main;
 610
 611   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 612   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 613
 614   if (!is_add)
 615     {
 616       /* Ensure that IPv6 is disabled */
 617       ip6_main_t *im6 = &ip6_main;
 618       ip_lookup_main_t *lm6 = &im6->lookup_main;
 619       ip_interface_address_t *ia = 0;
 620       ip6_address_t *address;
 621       vlib_main_t *vm = vlib_get_main ();
 622
 623       ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ );
 624       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 625       /* *INDENT-OFF* */
 626       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 627       ({
 628         address = ip_interface_address_get_address (lm6, ia);
 629         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 630       }));
 631       /* *INDENT-ON* */
 632       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 633     }
 634
 635   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 636                                is_add, 0, 0);
 637
 638   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 639                                sw_if_index, is_add, 0, 0);
 640
 641   return /* no error */ 0;
 642 }
 643
 644 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 645
 646 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 647                                 vlib_node_runtime_t * node,
 648                                 vlib_frame_t * frame)
 649 {
 650   return ip6_lookup_inline (vm, node, frame);
 651 }
 652
 653 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 654
 655 /* *INDENT-OFF* */
 656 VLIB_REGISTER_NODE (ip6_lookup_node) =
 657 {
 658   .name = "ip6-lookup",
 659   .vector_size = sizeof (u32),
 660   .format_trace = format_ip6_lookup_trace,
 661   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 662   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 663 };
 664 /* *INDENT-ON* */
 665
 666 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 667                                       vlib_node_runtime_t * node,
 668                                       vlib_frame_t * frame)
 669 {
 670   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 671   u32 n_left, *from;
 672   u32 thread_index = vm->thread_index;
 673   ip6_main_t *im = &ip6_main;
 674   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 675   u16 nexts[VLIB_FRAME_SIZE], *next;
 676
 677   from = vlib_frame_vector_args (frame);
 678   n_left = frame->n_vectors;
 679   next = nexts;
 680
 681   vlib_get_buffers (vm, from, bufs, n_left);
 682
 683   while (n_left >= 4)
 684     {
 685       const load_balance_t *lb0, *lb1;
 686       const ip6_header_t *ip0, *ip1;
 687       u32 lbi0, hc0, lbi1, hc1;
 688       const dpo_id_t *dpo0, *dpo1;
 689
 690       /* Prefetch next iteration. */
 691       {
 692         vlib_prefetch_buffer_header (b[2], STORE);
 693         vlib_prefetch_buffer_header (b[3], STORE);
 694
 695         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 696         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 697       }
 698
 699       ip0 = vlib_buffer_get_current (b[0]);
 700       ip1 = vlib_buffer_get_current (b[1]);
 701       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 702       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 703
 704       lb0 = load_balance_get (lbi0);
 705       lb1 = load_balance_get (lbi1);
 706
 707       /*
 708        * this node is for via FIBs we can re-use the hash value from the
 709        * to node if present.
 710        * We don't want to use the same hash value at each level in the recursion
 711        * graph as that would lead to polarisation
 712        */
 713       hc0 = hc1 = 0;
 714
 715       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 716         {
 717           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 718             {
 719               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 720                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 721             }
 722           else
 723             {
 724               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 725                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 726             }
 727           dpo0 = load_balance_get_fwd_bucket
 728             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 729         }
 730       else
 731         {
 732           dpo0 = load_balance_get_bucket_i (lb0, 0);
 733         }
 734       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 735         {
 736           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 737             {
 738               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 739                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 740             }
 741           else
 742             {
 743               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 744                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 745             }
 746           dpo1 = load_balance_get_fwd_bucket
 747             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 748         }
 749       else
 750         {
 751           dpo1 = load_balance_get_bucket_i (lb1, 0);
 752         }
 753
 754       next[0] = dpo0->dpoi_next_node;
 755       next[1] = dpo1->dpoi_next_node;
 756
 757       /* Only process the HBH Option Header if explicitly configured to do so */
 758       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 759         {
 760           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 761             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 762         }
 763       /* Only process the HBH Option Header if explicitly configured to do so */
 764       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 765         {
 766           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 767             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 768         }
 769
 770       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 771       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 772
 773       vlib_increment_combined_counter
 774         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 775       vlib_increment_combined_counter
 776         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 777
 778       b += 2;
 779       next += 2;
 780       n_left -= 2;
 781     }
 782
 783   while (n_left > 0)
 784     {
 785       const load_balance_t *lb0;
 786       const ip6_header_t *ip0;
 787       const dpo_id_t *dpo0;
 788       u32 lbi0, hc0;
 789
 790       ip0 = vlib_buffer_get_current (b[0]);
 791       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 792
 793       lb0 = load_balance_get (lbi0);
 794
 795       hc0 = 0;
 796       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 797         {
 798           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 799             {
 800               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 801                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 802             }
 803           else
 804             {
 805               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 806                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 807             }
 808           dpo0 = load_balance_get_fwd_bucket
 809             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 810         }
 811       else
 812         {
 813           dpo0 = load_balance_get_bucket_i (lb0, 0);
 814         }
 815
 816       next[0] = dpo0->dpoi_next_node;
 817       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 818
 819       /* Only process the HBH Option Header if explicitly configured to do so */
 820       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 821         {
 822           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 823             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 824         }
 825
 826       vlib_increment_combined_counter
 827         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 828
 829       b += 1;
 830       next += 1;
 831       n_left -= 1;
 832     }
 833
 834   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 835
 836   if (node->flags & VLIB_NODE_FLAG_TRACE)
 837     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 838
 839   return frame->n_vectors;
 840 }
 841
 842 /* *INDENT-OFF* */
 843 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 844 {
 845   .name = "ip6-load-balance",
 846   .vector_size = sizeof (u32),
 847   .sibling_of = "ip6-lookup",
 848   .format_trace = format_ip6_lookup_trace,
 849 };
 850 /* *INDENT-ON* */
 851
 852 typedef struct
 853 {
 854   /* Adjacency taken. */
 855   u32 adj_index;
 856   u32 flow_hash;
 857   u32 fib_index;
 858
 859   /* Packet data, possibly *after* rewrite. */
 860   u8 packet_data[128 - 1 * sizeof (u32)];
 861 }
 862 ip6_forward_next_trace_t;
 863
 864 #ifndef CLIB_MARCH_VARIANT
 865 u8 *
 866 format_ip6_forward_next_trace (u8 * s, va_list * args)
 867 {
 868   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 869   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 870   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 871   u32 indent = format_get_indent (s);
 872
 873   s = format (s, "%U%U",
 874               format_white_space, indent,
 875               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 876   return s;
 877 }
 878 #endif
 879
 880 static u8 *
 881 format_ip6_lookup_trace (u8 * s, va_list * args)
 882 {
 883   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 884   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 885   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 886   u32 indent = format_get_indent (s);
 887
 888   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 889               t->fib_index, t->adj_index, t->flow_hash);
 890   s = format (s, "\n%U%U",
 891               format_white_space, indent,
 892               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 893   return s;
 894 }
 895
 896
 897 static u8 *
 898 format_ip6_rewrite_trace (u8 * s, va_list * args)
 899 {
 900   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 901   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 902   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 903   u32 indent = format_get_indent (s);
 904
 905   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 906               t->fib_index, t->adj_index, format_ip_adjacency,
 907               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 908   s = format (s, "\n%U%U",
 909               format_white_space, indent,
 910               format_ip_adjacency_packet_data,
 911               t->adj_index, t->packet_data, sizeof (t->packet_data));
 912   return s;
 913 }
 914
 915 /* Common trace function for all ip6-forward next nodes. */
 916 #ifndef CLIB_MARCH_VARIANT
 917 void
 918 ip6_forward_next_trace (vlib_main_t * vm,
 919                         vlib_node_runtime_t * node,
 920                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 921 {
 922   u32 *from, n_left;
 923   ip6_main_t *im = &ip6_main;
 924
 925   n_left = frame->n_vectors;
 926   from = vlib_frame_vector_args (frame);
 927
 928   while (n_left >= 4)
 929     {
 930       u32 bi0, bi1;
 931       vlib_buffer_t *b0, *b1;
 932       ip6_forward_next_trace_t *t0, *t1;
 933
 934       /* Prefetch next iteration. */
 935       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 936       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 937
 938       bi0 = from[0];
 939       bi1 = from[1];
 940
 941       b0 = vlib_get_buffer (vm, bi0);
 942       b1 = vlib_get_buffer (vm, bi1);
 943
 944       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 945         {
 946           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 947           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 948           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 949           t0->fib_index =
 950             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 951              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 952             vec_elt (im->fib_index_by_sw_if_index,
 953                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 954
 955           clib_memcpy_fast (t0->packet_data,
 956                             vlib_buffer_get_current (b0),
 957                             sizeof (t0->packet_data));
 958         }
 959       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 960         {
 961           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 962           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 963           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 964           t1->fib_index =
 965             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 966              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 967             vec_elt (im->fib_index_by_sw_if_index,
 968                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 969
 970           clib_memcpy_fast (t1->packet_data,
 971                             vlib_buffer_get_current (b1),
 972                             sizeof (t1->packet_data));
 973         }
 974       from += 2;
 975       n_left -= 2;
 976     }
 977
 978   while (n_left >= 1)
 979     {
 980       u32 bi0;
 981       vlib_buffer_t *b0;
 982       ip6_forward_next_trace_t *t0;
 983
 984       bi0 = from[0];
 985
 986       b0 = vlib_get_buffer (vm, bi0);
 987
 988       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 989         {
 990           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 991           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 992           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 993           t0->fib_index =
 994             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 995              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 996             vec_elt (im->fib_index_by_sw_if_index,
 997                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 998
 999           clib_memcpy_fast (t0->packet_data,
1000                             vlib_buffer_get_current (b0),
1001                             sizeof (t0->packet_data));
1002         }
1003       from += 1;
1004       n_left -= 1;
1005     }
1006 }
1007
1008 /* Compute TCP/UDP/ICMP6 checksum in software. */
1009 u16
1010 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1011                                    ip6_header_t * ip0, int *bogus_lengthp)
1012 {
1013   ip_csum_t sum0;
1014   u16 sum16, payload_length_host_byte_order;
1015   u32 i, n_this_buffer, n_bytes_left;
1016   u32 headers_size = sizeof (ip0[0]);
1017   u8 *data_this_buffer;
1018   u8 length_odd;
1019
1020   ASSERT (bogus_lengthp);
1021   *bogus_lengthp = 0;
1022
1023   /* Initialize checksum with ip header. */
1024   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1025   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1026   data_this_buffer = (u8 *) (ip0 + 1);
1027
1028   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1029     {
1030       sum0 = ip_csum_with_carry (sum0,
1031                                  clib_mem_unaligned (&ip0->
1032                                                      src_address.as_uword[i],
1033                                                      uword));
1034       sum0 =
1035         ip_csum_with_carry (sum0,
1036                             clib_mem_unaligned (&ip0->dst_address.as_uword[i],
1037                                                 uword));
1038     }
1039
1040   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1041    * or UDP-Ping packets */
1042   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1043     {
1044       u32 skip_bytes;
1045       ip6_hop_by_hop_ext_t *ext_hdr =
1046         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1047
1048       /* validate really icmp6 next */
1049       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1050               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1051
1052       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1053       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1054
1055       payload_length_host_byte_order -= skip_bytes;
1056       headers_size += skip_bytes;
1057     }
1058
1059   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1060
1061   if (p0)
1062     {
1063       u32 n_ip_bytes_this_buffer =
1064         p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1065       if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1066         {
1067           n_this_buffer = p0->current_length > headers_size ?
1068             n_ip_bytes_this_buffer - headers_size : 0;
1069         }
1070     }
1071
1072   while (1)
1073     {
1074       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1075       n_bytes_left -= n_this_buffer;
1076       if (n_bytes_left == 0)
1077         break;
1078
1079       ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1080       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1081         {
1082           *bogus_lengthp = 1;
1083           return 0xfefe;
1084         }
1085
1086       length_odd = (n_this_buffer & 1);
1087
1088       p0 = vlib_get_buffer (vm, p0->next_buffer);
1089       data_this_buffer = vlib_buffer_get_current (p0);
1090       n_this_buffer = clib_min (p0->current_length, n_bytes_left);
1091
1092       if (PREDICT_FALSE (length_odd))
1093         {
1094           /* Prepend a 0 or the resulting checksum will be incorrect. */
1095           data_this_buffer--;
1096           n_this_buffer++;
1097           n_bytes_left++;
1098           data_this_buffer[0] = 0;
1099         }
1100     }
1101
1102   sum16 = ~ip_csum_fold (sum0);
1103
1104   return sum16;
1105 }
1106
1107 u32
1108 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1109 {
1110   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1111   udp_header_t *udp0;
1112   u16 sum16;
1113   int bogus_length;
1114
1115   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1116   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1117           || ip0->protocol == IP_PROTOCOL_ICMP6
1118           || ip0->protocol == IP_PROTOCOL_UDP
1119           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1120
1121   udp0 = (void *) (ip0 + 1);
1122   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1123     {
1124       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1125                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1126       return p0->flags;
1127     }
1128
1129   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1130
1131   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1132                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1133
1134   return p0->flags;
1135 }
1136 #endif
1137
1138 /**
1139  * @brief returns number of links on which src is reachable.
1140  */
1141 always_inline int
1142 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1143 {
1144   const load_balance_t *lb0;
1145   index_t lbi;
1146   u32 fib_index;
1147
1148   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1149                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1150   fib_index =
1151     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1152     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1153
1154   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1155   lb0 = load_balance_get (lbi);
1156
1157   return (fib_urpf_check_size (lb0->lb_urpf));
1158 }
1159
1160 always_inline u8
1161 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1162                            u32 * udp_offset0)
1163 {
1164   u32 proto0;
1165   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1166   if (proto0 != IP_PROTOCOL_UDP)
1167     {
1168       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1169       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1170     }
1171   return proto0;
1172 }
1173
1174 /* *INDENT-OFF* */
1175 VNET_FEATURE_ARC_INIT (ip6_local) =
1176 {
1177   .arc_name  = "ip6-local",
1178   .start_nodes = VNET_FEATURES ("ip6-local"),
1179 };
1180 /* *INDENT-ON* */
1181
1182 always_inline uword
1183 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1184                   vlib_frame_t * frame, int head_of_feature_arc)
1185 {
1186   ip6_main_t *im = &ip6_main;
1187   ip_lookup_main_t *lm = &im->lookup_main;
1188   u32 *from, n_left_from;
1189   vlib_node_runtime_t *error_node =
1190     vlib_node_get_runtime (vm, ip6_input_node.index);
1191   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1192   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1193   u16 nexts[VLIB_FRAME_SIZE], *next;
1194
1195   from = vlib_frame_vector_args (frame);
1196   n_left_from = frame->n_vectors;
1197
1198   if (node->flags & VLIB_NODE_FLAG_TRACE)
1199     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1200
1201   vlib_get_buffers (vm, from, bufs, n_left_from);
1202   b = bufs;
1203   next = nexts;
1204
1205   while (n_left_from > 2)
1206     {
1207       /* Prefetch next iteration. */
1208       if (n_left_from >= 6)
1209         {
1210           vlib_prefetch_buffer_header (b[4], STORE);
1211           vlib_prefetch_buffer_header (b[5], STORE);
1212           vlib_prefetch_buffer_data (b[2], LOAD);
1213           vlib_prefetch_buffer_data (b[3], LOAD);
1214         }
1215
1216       u8 error[2];
1217       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1218       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1219
1220       ip6_header_t *ip[2];
1221       ip[0] = vlib_buffer_get_current (b[0]);
1222       ip[1] = vlib_buffer_get_current (b[1]);
1223
1224       if (head_of_feature_arc)
1225         {
1226           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1227           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1228
1229           u8 type[2];
1230           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1231           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1232
1233           u32 flags[2];
1234           flags[0] = b[0]->flags;
1235           flags[1] = b[1]->flags;
1236
1237           u32 good_l4_csum[2];
1238           good_l4_csum[0] =
1239             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1240                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1241                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1242           good_l4_csum[1] =
1243             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1244                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1245                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1246
1247           u32 udp_offset[2] = { };
1248           u8 is_tcp_udp[2];
1249           is_tcp_udp[0] =
1250             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1251           is_tcp_udp[1] =
1252             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1253           i16 len_diff[2] = { 0 };
1254           if (PREDICT_TRUE (is_tcp_udp[0]))
1255             {
1256               udp_header_t *udp =
1257                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1258               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1259                 && udp->checksum == 0;
1260               /* optimistically verify UDP length. */
1261               u16 ip_len, udp_len;
1262               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1263               udp_len = clib_net_to_host_u16 (udp->length);
1264               len_diff[0] = ip_len - udp_len;
1265             }
1266           if (PREDICT_TRUE (is_tcp_udp[1]))
1267             {
1268               udp_header_t *udp =
1269                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1270               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1271                 && udp->checksum == 0;
1272               /* optimistically verify UDP length. */
1273               u16 ip_len, udp_len;
1274               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1275               udp_len = clib_net_to_host_u16 (udp->length);
1276               len_diff[1] = ip_len - udp_len;
1277             }
1278
1279           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1280           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1281
1282           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1283           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1284
1285           u8 need_csum[2];
1286           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1287             && !good_l4_csum[0]
1288             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1289           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1290             && !good_l4_csum[1]
1291             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1292           if (PREDICT_FALSE (need_csum[0]))
1293             {
1294               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1295               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1296             }
1297           if (PREDICT_FALSE (need_csum[1]))
1298             {
1299               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1300               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1301             }
1302
1303           error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1304           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1305           error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1306           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1307
1308           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1309                          IP6_ERROR_UDP_CHECKSUM,
1310                          "Wrong IP6 errors constants");
1311           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1312                          IP6_ERROR_ICMP_CHECKSUM,
1313                          "Wrong IP6 errors constants");
1314
1315           error[0] =
1316             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1317           error[1] =
1318             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1319
1320           /* Drop packets from unroutable hosts. */
1321           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1322           u8 unroutable[2];
1323           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1324             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1325             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1326           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1327             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1328             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1329           if (PREDICT_FALSE (unroutable[0]))
1330             {
1331               error[0] =
1332                 !ip6_urpf_loose_check (im, b[0],
1333                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1334                 : error[0];
1335             }
1336           if (PREDICT_FALSE (unroutable[1]))
1337             {
1338               error[1] =
1339                 !ip6_urpf_loose_check (im, b[1],
1340                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1341                 : error[1];
1342             }
1343
1344           vnet_buffer (b[0])->ip.fib_index =
1345             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1346             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1347             vnet_buffer (b[0])->ip.fib_index;
1348           vnet_buffer (b[1])->ip.fib_index =
1349             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1350             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1351             vnet_buffer (b[1])->ip.fib_index;
1352         }                       /* head_of_feature_arc */
1353
1354       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1355       next[0] =
1356         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1357       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1358       next[1] =
1359         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1360
1361       b[0]->error = error_node->errors[0];
1362       b[1]->error = error_node->errors[1];
1363
1364       if (head_of_feature_arc)
1365         {
1366           u8 ip6_unknown[2];
1367           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1368           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1369           if (PREDICT_TRUE (ip6_unknown[0]))
1370             {
1371               u32 next32 = next[0];
1372               vnet_feature_arc_start (arc_index,
1373                                       vnet_buffer (b[0])->sw_if_index
1374                                       [VLIB_RX], &next32, b[0]);
1375               next[0] = next32;
1376             }
1377           if (PREDICT_TRUE (ip6_unknown[1]))
1378             {
1379               u32 next32 = next[1];
1380               vnet_feature_arc_start (arc_index,
1381                                       vnet_buffer (b[1])->sw_if_index
1382                                       [VLIB_RX], &next32, b[1]);
1383               next[1] = next32;
1384             }
1385         }
1386
1387       /* next */
1388       b += 2;
1389       next += 2;
1390       n_left_from -= 2;
1391     }
1392
1393   while (n_left_from)
1394     {
1395       u8 error;
1396       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1397
1398       ip6_header_t *ip;
1399       ip = vlib_buffer_get_current (b[0]);
1400
1401       if (head_of_feature_arc)
1402         {
1403           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1404           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1405
1406           u32 flags = b[0]->flags;
1407           u32 good_l4_csum =
1408             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1409                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1410                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1411
1412           u32 udp_offset;
1413           i16 len_diff = 0;
1414           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1415           if (PREDICT_TRUE (is_tcp_udp))
1416             {
1417               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1418               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1419               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1420                 && udp->checksum == 0;
1421               /* optimistically verify UDP length. */
1422               u16 ip_len, udp_len;
1423               ip_len = clib_net_to_host_u16 (ip->payload_length);
1424               udp_len = clib_net_to_host_u16 (udp->length);
1425               len_diff = ip_len - udp_len;
1426             }
1427
1428           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1429           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1430
1431           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1432             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1433           if (PREDICT_FALSE (need_csum))
1434             {
1435               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1436               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1437             }
1438
1439           error = IP6_ERROR_UNKNOWN_PROTOCOL;
1440           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1441
1442           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1443                          IP6_ERROR_UDP_CHECKSUM,
1444                          "Wrong IP6 errors constants");
1445           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1446                          IP6_ERROR_ICMP_CHECKSUM,
1447                          "Wrong IP6 errors constants");
1448
1449           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1450
1451           /* Drop packets from unroutable hosts. */
1452           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1453           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1454             && type != IP_BUILTIN_PROTOCOL_ICMP
1455             && !ip6_address_is_link_local_unicast (&ip->src_address);
1456           if (PREDICT_FALSE (unroutable))
1457             {
1458               error =
1459                 !ip6_urpf_loose_check (im, b[0],
1460                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1461                 error;
1462             }
1463
1464           vnet_buffer (b[0])->ip.fib_index =
1465             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1466             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1467             vnet_buffer (b[0])->ip.fib_index;
1468         }                       /* head_of_feature_arc */
1469
1470       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1471       next[0] =
1472         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1473
1474       b[0]->error = error_node->errors[0];
1475
1476       if (head_of_feature_arc)
1477         {
1478           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1479             {
1480               u32 next32 = next[0];
1481               vnet_feature_arc_start (arc_index,
1482                                       vnet_buffer (b[0])->sw_if_index
1483                                       [VLIB_RX], &next32, b[0]);
1484               next[0] = next32;
1485             }
1486         }
1487
1488       /* next */
1489       b += 1;
1490       next += 1;
1491       n_left_from -= 1;
1492     }
1493
1494   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1495   return frame->n_vectors;
1496 }
1497
1498 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1499                                vlib_frame_t * frame)
1500 {
1501   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1502 }
1503
1504 /* *INDENT-OFF* */
1505 VLIB_REGISTER_NODE (ip6_local_node) =
1506 {
1507   .name = "ip6-local",
1508   .vector_size = sizeof (u32),
1509   .format_trace = format_ip6_forward_next_trace,
1510   .n_next_nodes = IP_LOCAL_N_NEXT,
1511   .next_nodes =
1512   {
1513     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1514     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1515     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1516     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1517     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1518   },
1519 };
1520 /* *INDENT-ON* */
1521
1522 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1523                                           vlib_node_runtime_t * node,
1524                                           vlib_frame_t * frame)
1525 {
1526   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1527 }
1528
1529 /* *INDENT-OFF* */
1530 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1531   .name = "ip6-local-end-of-arc",
1532   .vector_size = sizeof (u32),
1533
1534   .format_trace = format_ip6_forward_next_trace,
1535   .sibling_of = "ip6-local",
1536 };
1537
1538 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1539   .arc_name = "ip6-local",
1540   .node_name = "ip6-local-end-of-arc",
1541   .runs_before = 0, /* not before any other features */
1542 };
1543 /* *INDENT-ON* */
1544
1545 #ifdef CLIB_MARCH_VARIANT
1546 extern vlib_node_registration_t ip6_local_node;
1547
1548 #else
1549
1550 void
1551 ip6_register_protocol (u32 protocol, u32 node_index)
1552 {
1553   vlib_main_t *vm = vlib_get_main ();
1554   ip6_main_t *im = &ip6_main;
1555   ip_lookup_main_t *lm = &im->lookup_main;
1556
1557   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1558   lm->local_next_by_ip_protocol[protocol] =
1559     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1560 }
1561
1562 void
1563 ip6_unregister_protocol (u32 protocol)
1564 {
1565   ip6_main_t *im = &ip6_main;
1566   ip_lookup_main_t *lm = &im->lookup_main;
1567
1568   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1569   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1570 }
1571
1572 clib_error_t *
1573 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index,
1574                     u8 refresh)
1575 {
1576   vnet_main_t *vnm = vnet_get_main ();
1577   ip6_main_t *im = &ip6_main;
1578   icmp6_neighbor_solicitation_header_t *h;
1579   ip6_address_t *src;
1580   ip_interface_address_t *ia;
1581   ip_adjacency_t *adj;
1582   vnet_hw_interface_t *hi;
1583   vnet_sw_interface_t *si;
1584   vlib_buffer_t *b;
1585   adj_index_t ai;
1586   u32 bi = 0;
1587   int bogus_length;
1588
1589   si = vnet_get_sw_interface (vnm, sw_if_index);
1590
1591   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1592     {
1593       return clib_error_return (0, "%U: interface %U down",
1594                                 format_ip6_address, dst,
1595                                 format_vnet_sw_if_index_name, vnm,
1596                                 sw_if_index);
1597     }
1598
1599   src =
1600     ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1601   if (!src)
1602     {
1603       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1604       return clib_error_return
1605         (0, "no matching interface address for destination %U (interface %U)",
1606          format_ip6_address, dst,
1607          format_vnet_sw_if_index_name, vnm, sw_if_index);
1608     }
1609
1610   h =
1611     vlib_packet_template_get_packet (vm,
1612                                      &im->discover_neighbor_packet_template,
1613                                      &bi);
1614   if (!h)
1615     return clib_error_return (0, "ICMP6 NS packet allocation failed");
1616
1617   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1618
1619   /* Destination address is a solicited node multicast address.  We need to fill in
1620      the low 24 bits with low 24 bits of target's address. */
1621   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1622   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1623   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1624
1625   h->ip.src_address = src[0];
1626   h->neighbor.target_address = dst[0];
1627
1628   if (PREDICT_FALSE (!hi->hw_address))
1629     {
1630       return clib_error_return (0, "%U: interface %U do not support ip probe",
1631                                 format_ip6_address, dst,
1632                                 format_vnet_sw_if_index_name, vnm,
1633                                 sw_if_index);
1634     }
1635
1636   clib_memcpy_fast (h->link_layer_option.ethernet_address, hi->hw_address,
1637                     vec_len (hi->hw_address));
1638
1639   h->neighbor.icmp.checksum =
1640     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1641   ASSERT (bogus_length == 0);
1642
1643   b = vlib_get_buffer (vm, bi);
1644   vnet_buffer (b)->sw_if_index[VLIB_RX] =
1645     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1646
1647   /* Add encapsulation string for software interface (e.g. ethernet header). */
1648   ip46_address_t nh = {
1649     .ip6 = *dst,
1650   };
1651
1652   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
1653                             VNET_LINK_IP6, &nh, sw_if_index);
1654   adj = adj_get (ai);
1655
1656   /* Peer has been previously resolved, retrieve glean adj instead */
1657   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE && refresh == 0)
1658     {
1659       adj_unlock (ai);
1660       ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6,
1661                                   VNET_LINK_IP6, sw_if_index, &nh);
1662       adj = adj_get (ai);
1663     }
1664
1665   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1666   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1667
1668   {
1669     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
1670     u32 *to_next = vlib_frame_vector_args (f);
1671     to_next[0] = bi;
1672     f->n_vectors = 1;
1673     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1674   }
1675
1676   adj_unlock (ai);
1677   return /* no error */ 0;
1678 }
1679 #endif
1680
1681 typedef enum
1682 {
1683   IP6_REWRITE_NEXT_DROP,
1684   IP6_REWRITE_NEXT_ICMP_ERROR,
1685   IP6_REWRITE_NEXT_FRAGMENT,
1686   IP6_REWRITE_N_NEXT            /* Last */
1687 } ip6_rewrite_next_t;
1688
1689 /**
1690  * This bits of an IPv6 address to mask to construct a multicast
1691  * MAC address
1692  */
1693 #define IP6_MCAST_ADDR_MASK 0xffffffff
1694
1695 always_inline void
1696 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1697                u16 adj_packet_bytes, bool is_locally_generated,
1698                u32 * next, u32 * error)
1699 {
1700   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1701     {
1702       if (is_locally_generated)
1703         {
1704           /* IP fragmentation */
1705           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1706                                    IP6_FRAG_NEXT_IP6_REWRITE, 0);
1707           *next = IP6_REWRITE_NEXT_FRAGMENT;
1708           *error = IP6_ERROR_MTU_EXCEEDED;
1709         }
1710       else
1711         {
1712           *error = IP6_ERROR_MTU_EXCEEDED;
1713           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1714                                        adj_packet_bytes);
1715           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1716         }
1717     }
1718 }
1719
1720 always_inline uword
1721 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1722                              vlib_node_runtime_t * node,
1723                              vlib_frame_t * frame,
1724                              int do_counters, int is_midchain, int is_mcast,
1725                              int do_gso)
1726 {
1727   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1728   u32 *from = vlib_frame_vector_args (frame);
1729   u32 n_left_from, n_left_to_next, *to_next, next_index;
1730   vlib_node_runtime_t *error_node =
1731     vlib_node_get_runtime (vm, ip6_input_node.index);
1732
1733   n_left_from = frame->n_vectors;
1734   next_index = node->cached_next_index;
1735   u32 thread_index = vm->thread_index;
1736
1737   while (n_left_from > 0)
1738     {
1739       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1740
1741       while (n_left_from >= 4 && n_left_to_next >= 2)
1742         {
1743           ip_adjacency_t *adj0, *adj1;
1744           vlib_buffer_t *p0, *p1;
1745           ip6_header_t *ip0, *ip1;
1746           u32 pi0, rw_len0, next0, error0, adj_index0;
1747           u32 pi1, rw_len1, next1, error1, adj_index1;
1748           u32 tx_sw_if_index0, tx_sw_if_index1;
1749           bool is_locally_originated0, is_locally_originated1;
1750
1751           /* Prefetch next iteration. */
1752           {
1753             vlib_buffer_t *p2, *p3;
1754
1755             p2 = vlib_get_buffer (vm, from[2]);
1756             p3 = vlib_get_buffer (vm, from[3]);
1757
1758             vlib_prefetch_buffer_header (p2, LOAD);
1759             vlib_prefetch_buffer_header (p3, LOAD);
1760
1761             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1762             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1763
1764             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1765             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1766           }
1767
1768           pi0 = to_next[0] = from[0];
1769           pi1 = to_next[1] = from[1];
1770
1771           from += 2;
1772           n_left_from -= 2;
1773           to_next += 2;
1774           n_left_to_next -= 2;
1775
1776           p0 = vlib_get_buffer (vm, pi0);
1777           p1 = vlib_get_buffer (vm, pi1);
1778
1779           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1780           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1781
1782           ip0 = vlib_buffer_get_current (p0);
1783           ip1 = vlib_buffer_get_current (p1);
1784
1785           error0 = error1 = IP6_ERROR_NONE;
1786           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1787
1788           is_locally_originated0 =
1789             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1790           if (PREDICT_TRUE (!is_locally_originated0))
1791             {
1792               i32 hop_limit0 = ip0->hop_limit;
1793
1794               /* Input node should have reject packets with hop limit 0. */
1795               ASSERT (ip0->hop_limit > 0);
1796
1797               hop_limit0 -= 1;
1798
1799               ip0->hop_limit = hop_limit0;
1800
1801               /*
1802                * If the hop count drops below 1 when forwarding, generate
1803                * an ICMP response.
1804                */
1805               if (PREDICT_FALSE (hop_limit0 <= 0))
1806                 {
1807                   error0 = IP6_ERROR_TIME_EXPIRED;
1808                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1809                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1810                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1811                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1812                                                0);
1813                 }
1814             }
1815           else
1816             {
1817               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1818             }
1819           is_locally_originated1 =
1820             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1821           if (PREDICT_TRUE (!is_locally_originated1))
1822             {
1823               i32 hop_limit1 = ip1->hop_limit;
1824
1825               /* Input node should have reject packets with hop limit 0. */
1826               ASSERT (ip1->hop_limit > 0);
1827
1828               hop_limit1 -= 1;
1829
1830               ip1->hop_limit = hop_limit1;
1831
1832               /*
1833                * If the hop count drops below 1 when forwarding, generate
1834                * an ICMP response.
1835                */
1836               if (PREDICT_FALSE (hop_limit1 <= 0))
1837                 {
1838                   error1 = IP6_ERROR_TIME_EXPIRED;
1839                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1840                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1841                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1842                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1843                                                0);
1844                 }
1845             }
1846           else
1847             {
1848               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1849             }
1850           adj0 = adj_get (adj_index0);
1851           adj1 = adj_get (adj_index1);
1852
1853           rw_len0 = adj0[0].rewrite_header.data_bytes;
1854           rw_len1 = adj1[0].rewrite_header.data_bytes;
1855           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1856           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1857
1858           if (do_counters)
1859             {
1860               vlib_increment_combined_counter
1861                 (&adjacency_counters,
1862                  thread_index, adj_index0, 1,
1863                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1864               vlib_increment_combined_counter
1865                 (&adjacency_counters,
1866                  thread_index, adj_index1, 1,
1867                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1868             }
1869
1870           /* Check MTU of outgoing interface. */
1871           u16 ip0_len =
1872             clib_net_to_host_u16 (ip0->payload_length) +
1873             sizeof (ip6_header_t);
1874           u16 ip1_len =
1875             clib_net_to_host_u16 (ip1->payload_length) +
1876             sizeof (ip6_header_t);
1877           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
1878             ip0_len = gso_mtu_sz (p0);
1879           if (do_gso && (p1->flags & VNET_BUFFER_F_GSO))
1880             ip1_len = gso_mtu_sz (p1);
1881
1882
1883
1884           ip6_mtu_check (p0, ip0_len,
1885                          adj0[0].rewrite_header.max_l3_packet_bytes,
1886                          is_locally_originated0, &next0, &error0);
1887           ip6_mtu_check (p1, ip1_len,
1888                          adj1[0].rewrite_header.max_l3_packet_bytes,
1889                          is_locally_originated1, &next1, &error1);
1890
1891           /* Don't adjust the buffer for hop count issue; icmp-error node
1892            * wants to see the IP header */
1893           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1894             {
1895               p0->current_data -= rw_len0;
1896               p0->current_length += rw_len0;
1897
1898               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1899               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1900               next0 = adj0[0].rewrite_header.next_index;
1901
1902               if (PREDICT_FALSE
1903                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1904                 vnet_feature_arc_start (lm->output_feature_arc_index,
1905                                         tx_sw_if_index0, &next0, p0);
1906             }
1907           else
1908             {
1909               p0->error = error_node->errors[error0];
1910             }
1911           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1912             {
1913               p1->current_data -= rw_len1;
1914               p1->current_length += rw_len1;
1915
1916               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1917               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1918               next1 = adj1[0].rewrite_header.next_index;
1919
1920               if (PREDICT_FALSE
1921                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1922                 vnet_feature_arc_start (lm->output_feature_arc_index,
1923                                         tx_sw_if_index1, &next1, p1);
1924             }
1925           else
1926             {
1927               p1->error = error_node->errors[error1];
1928             }
1929
1930           if (is_midchain)
1931             {
1932               /* before we paint on the next header, update the L4
1933                * checksums if required, since there's no offload on a tunnel */
1934               calc_checksums (vm, p0);
1935               calc_checksums (vm, p1);
1936             }
1937
1938           /* Guess we are only writing on simple Ethernet header. */
1939           vnet_rewrite_two_headers (adj0[0], adj1[0],
1940                                     ip0, ip1, sizeof (ethernet_header_t));
1941
1942           if (is_midchain)
1943             {
1944               if (adj0->sub_type.midchain.fixup_func)
1945                 adj0->sub_type.midchain.fixup_func
1946                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1947               if (adj1->sub_type.midchain.fixup_func)
1948                 adj1->sub_type.midchain.fixup_func
1949                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1950             }
1951           if (is_mcast)
1952             {
1953               /*
1954                * copy bytes from the IP address into the MAC rewrite
1955                */
1956               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1957                                           adj0->
1958                                           rewrite_header.dst_mcast_offset,
1959                                           &ip0->dst_address.as_u32[3],
1960                                           (u8 *) ip0);
1961               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1962                                           adj1->
1963                                           rewrite_header.dst_mcast_offset,
1964                                           &ip1->dst_address.as_u32[3],
1965                                           (u8 *) ip1);
1966             }
1967
1968           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1969                                            to_next, n_left_to_next,
1970                                            pi0, pi1, next0, next1);
1971         }
1972
1973       while (n_left_from > 0 && n_left_to_next > 0)
1974         {
1975           ip_adjacency_t *adj0;
1976           vlib_buffer_t *p0;
1977           ip6_header_t *ip0;
1978           u32 pi0, rw_len0;
1979           u32 adj_index0, next0, error0;
1980           u32 tx_sw_if_index0;
1981           bool is_locally_originated0;
1982
1983           pi0 = to_next[0] = from[0];
1984
1985           p0 = vlib_get_buffer (vm, pi0);
1986
1987           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1988
1989           adj0 = adj_get (adj_index0);
1990
1991           ip0 = vlib_buffer_get_current (p0);
1992
1993           error0 = IP6_ERROR_NONE;
1994           next0 = IP6_REWRITE_NEXT_DROP;
1995
1996           /* Check hop limit */
1997           is_locally_originated0 =
1998             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1999           if (PREDICT_TRUE (!is_locally_originated0))
2000             {
2001               i32 hop_limit0 = ip0->hop_limit;
2002
2003               ASSERT (ip0->hop_limit > 0);
2004
2005               hop_limit0 -= 1;
2006
2007               ip0->hop_limit = hop_limit0;
2008
2009               if (PREDICT_FALSE (hop_limit0 <= 0))
2010                 {
2011                   /*
2012                    * If the hop count drops below 1 when forwarding, generate
2013                    * an ICMP response.
2014                    */
2015                   error0 = IP6_ERROR_TIME_EXPIRED;
2016                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
2017                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2018                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
2019                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
2020                                                0);
2021                 }
2022             }
2023           else
2024             {
2025               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2026             }
2027
2028           if (is_midchain)
2029             {
2030               calc_checksums (vm, p0);
2031             }
2032
2033           /* Guess we are only writing on simple Ethernet header. */
2034           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2035
2036           /* Update packet buffer attributes/set output interface. */
2037           rw_len0 = adj0[0].rewrite_header.data_bytes;
2038           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2039
2040           if (do_counters)
2041             {
2042               vlib_increment_combined_counter
2043                 (&adjacency_counters,
2044                  thread_index, adj_index0, 1,
2045                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2046             }
2047
2048           /* Check MTU of outgoing interface. */
2049           u16 ip0_len =
2050             clib_net_to_host_u16 (ip0->payload_length) +
2051             sizeof (ip6_header_t);
2052           if (do_gso && (p0->flags & VNET_BUFFER_F_GSO))
2053             ip0_len = gso_mtu_sz (p0);
2054
2055           ip6_mtu_check (p0, ip0_len,
2056                          adj0[0].rewrite_header.max_l3_packet_bytes,
2057                          is_locally_originated0, &next0, &error0);
2058
2059           /* Don't adjust the buffer for hop count issue; icmp-error node
2060            * wants to see the IP header */
2061           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2062             {
2063               p0->current_data -= rw_len0;
2064               p0->current_length += rw_len0;
2065
2066               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2067
2068               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2069               next0 = adj0[0].rewrite_header.next_index;
2070
2071               if (PREDICT_FALSE
2072                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2073                 vnet_feature_arc_start (lm->output_feature_arc_index,
2074                                         tx_sw_if_index0, &next0, p0);
2075             }
2076           else
2077             {
2078               p0->error = error_node->errors[error0];
2079             }
2080
2081           if (is_midchain)
2082             {
2083               if (adj0->sub_type.midchain.fixup_func)
2084                 adj0->sub_type.midchain.fixup_func
2085                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2086             }
2087           if (is_mcast)
2088             {
2089               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2090                                           adj0->
2091                                           rewrite_header.dst_mcast_offset,
2092                                           &ip0->dst_address.as_u32[3],
2093                                           (u8 *) ip0);
2094             }
2095
2096           from += 1;
2097           n_left_from -= 1;
2098           to_next += 1;
2099           n_left_to_next -= 1;
2100
2101           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2102                                            to_next, n_left_to_next,
2103                                            pi0, next0);
2104         }
2105
2106       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2107     }
2108
2109   /* Need to do trace after rewrites to pick up new packet data. */
2110   if (node->flags & VLIB_NODE_FLAG_TRACE)
2111     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2112
2113   return frame->n_vectors;
2114 }
2115
2116 always_inline uword
2117 ip6_rewrite_inline (vlib_main_t * vm,
2118                     vlib_node_runtime_t * node,
2119                     vlib_frame_t * frame,
2120                     int do_counters, int is_midchain, int is_mcast)
2121 {
2122   vnet_main_t *vnm = vnet_get_main ();
2123   if (PREDICT_FALSE (vnm->interface_main.gso_interface_count > 0))
2124     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2125                                         is_midchain, is_mcast,
2126                                         1 /* do_gso */ );
2127   else
2128     return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2129                                         is_midchain, is_mcast,
2130                                         0 /* no do_gso */ );
2131 }
2132
2133 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2134                                  vlib_node_runtime_t * node,
2135                                  vlib_frame_t * frame)
2136 {
2137   if (adj_are_counters_enabled ())
2138     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2139   else
2140     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2141 }
2142
2143 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2144                                        vlib_node_runtime_t * node,
2145                                        vlib_frame_t * frame)
2146 {
2147   if (adj_are_counters_enabled ())
2148     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2149   else
2150     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2151 }
2152
2153 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2154                                        vlib_node_runtime_t * node,
2155                                        vlib_frame_t * frame)
2156 {
2157   if (adj_are_counters_enabled ())
2158     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2159   else
2160     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2161 }
2162
2163 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2164                                   vlib_node_runtime_t * node,
2165                                   vlib_frame_t * frame)
2166 {
2167   if (adj_are_counters_enabled ())
2168     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2169   else
2170     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2171 }
2172
2173 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2174                                         vlib_node_runtime_t * node,
2175                                         vlib_frame_t * frame)
2176 {
2177   if (adj_are_counters_enabled ())
2178     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2179   else
2180     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2181 }
2182
2183 /* *INDENT-OFF* */
2184 VLIB_REGISTER_NODE (ip6_midchain_node) =
2185 {
2186   .name = "ip6-midchain",
2187   .vector_size = sizeof (u32),
2188   .format_trace = format_ip6_forward_next_trace,
2189   .sibling_of = "ip6-rewrite",
2190   };
2191
2192 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2193 {
2194   .name = "ip6-rewrite",
2195   .vector_size = sizeof (u32),
2196   .format_trace = format_ip6_rewrite_trace,
2197   .n_next_nodes = IP6_REWRITE_N_NEXT,
2198   .next_nodes =
2199   {
2200     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2201     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2202     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2203   },
2204 };
2205
2206 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2207   .name = "ip6-rewrite-bcast",
2208   .vector_size = sizeof (u32),
2209
2210   .format_trace = format_ip6_rewrite_trace,
2211   .sibling_of = "ip6-rewrite",
2212 };
2213
2214 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2215 {
2216   .name = "ip6-rewrite-mcast",
2217   .vector_size = sizeof (u32),
2218   .format_trace = format_ip6_rewrite_trace,
2219   .sibling_of = "ip6-rewrite",
2220 };
2221
2222
2223 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2224 {
2225   .name = "ip6-mcast-midchain",
2226   .vector_size = sizeof (u32),
2227   .format_trace = format_ip6_rewrite_trace,
2228   .sibling_of = "ip6-rewrite",
2229 };
2230
2231 /* *INDENT-ON* */
2232
2233 /*
2234  * Hop-by-Hop handling
2235  */
2236 #ifndef CLIB_MARCH_VARIANT
2237 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2238 #endif /* CLIB_MARCH_VARIANT */
2239
2240 #define foreach_ip6_hop_by_hop_error \
2241 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2242 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2243 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2244
2245 /* *INDENT-OFF* */
2246 typedef enum
2247 {
2248 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2249   foreach_ip6_hop_by_hop_error
2250 #undef _
2251   IP6_HOP_BY_HOP_N_ERROR,
2252 } ip6_hop_by_hop_error_t;
2253 /* *INDENT-ON* */
2254
2255 /*
2256  * Primary h-b-h handler trace support
2257  * We work pretty hard on the problem for obvious reasons
2258  */
2259 typedef struct
2260 {
2261   u32 next_index;
2262   u32 trace_len;
2263   u8 option_data[256];
2264 } ip6_hop_by_hop_trace_t;
2265
2266 extern vlib_node_registration_t ip6_hop_by_hop_node;
2267
2268 static char *ip6_hop_by_hop_error_strings[] = {
2269 #define _(sym,string) string,
2270   foreach_ip6_hop_by_hop_error
2271 #undef _
2272 };
2273
2274 #ifndef CLIB_MARCH_VARIANT
2275 u8 *
2276 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2277 {
2278   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2279   int total_len = va_arg (*args, int);
2280   ip6_hop_by_hop_option_t *opt0, *limit0;
2281   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2282   u8 type0;
2283
2284   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2285               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2286
2287   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2288   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2289
2290   while (opt0 < limit0)
2291     {
2292       type0 = opt0->type;
2293       switch (type0)
2294         {
2295         case 0:         /* Pad, just stop */
2296           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2297           break;
2298
2299         default:
2300           if (hm->trace[type0])
2301             {
2302               s = (*hm->trace[type0]) (s, opt0);
2303             }
2304           else
2305             {
2306               s =
2307                 format (s, "\n    unrecognized option %d length %d", type0,
2308                         opt0->length);
2309             }
2310           opt0 =
2311             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2312                                          sizeof (ip6_hop_by_hop_option_t));
2313           break;
2314         }
2315     }
2316   return s;
2317 }
2318 #endif
2319
2320 static u8 *
2321 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2322 {
2323   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2324   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2325   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2326   ip6_hop_by_hop_header_t *hbh0;
2327   ip6_hop_by_hop_option_t *opt0, *limit0;
2328   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2329
2330   u8 type0;
2331
2332   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2333
2334   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2335               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2336
2337   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2338   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2339
2340   while (opt0 < limit0)
2341     {
2342       type0 = opt0->type;
2343       switch (type0)
2344         {
2345         case 0:         /* Pad, just stop */
2346           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2347           break;
2348
2349         default:
2350           if (hm->trace[type0])
2351             {
2352               s = (*hm->trace[type0]) (s, opt0);
2353             }
2354           else
2355             {
2356               s =
2357                 format (s, "\n    unrecognized option %d length %d", type0,
2358                         opt0->length);
2359             }
2360           opt0 =
2361             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2362                                          sizeof (ip6_hop_by_hop_option_t));
2363           break;
2364         }
2365     }
2366   return s;
2367 }
2368
2369 always_inline u8
2370 ip6_scan_hbh_options (vlib_buffer_t * b0,
2371                       ip6_header_t * ip0,
2372                       ip6_hop_by_hop_header_t * hbh0,
2373                       ip6_hop_by_hop_option_t * opt0,
2374                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2375 {
2376   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2377   u8 type0;
2378   u8 error0 = 0;
2379
2380   while (opt0 < limit0)
2381     {
2382       type0 = opt0->type;
2383       switch (type0)
2384         {
2385         case 0:         /* Pad1 */
2386           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2387           continue;
2388         case 1:         /* PadN */
2389           break;
2390         default:
2391           if (hm->options[type0])
2392             {
2393               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2394                 {
2395                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2396                   return (error0);
2397                 }
2398             }
2399           else
2400             {
2401               /* Unrecognized mandatory option, check the two high order bits */
2402               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2403                 {
2404                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2405                   break;
2406                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2407                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2408                   *next0 = IP_LOOKUP_NEXT_DROP;
2409                   break;
2410                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2411                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2412                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2413                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2414                                                ICMP6_parameter_problem_unrecognized_option,
2415                                                (u8 *) opt0 - (u8 *) ip0);
2416                   break;
2417                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2418                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2419                   if (!ip6_address_is_multicast (&ip0->dst_address))
2420                     {
2421                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2422                       icmp6_error_set_vnet_buffer (b0,
2423                                                    ICMP6_parameter_problem,
2424                                                    ICMP6_parameter_problem_unrecognized_option,
2425                                                    (u8 *) opt0 - (u8 *) ip0);
2426                     }
2427                   else
2428                     {
2429                       *next0 = IP_LOOKUP_NEXT_DROP;
2430                     }
2431                   break;
2432                 }
2433               return (error0);
2434             }
2435         }
2436       opt0 =
2437         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2438                                      sizeof (ip6_hop_by_hop_option_t));
2439     }
2440   return (error0);
2441 }
2442
2443 /*
2444  * Process the Hop-by-Hop Options header
2445  */
2446 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2447                                     vlib_node_runtime_t * node,
2448                                     vlib_frame_t * frame)
2449 {
2450   vlib_node_runtime_t *error_node =
2451     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2452   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2453   u32 n_left_from, *from, *to_next;
2454   ip_lookup_next_t next_index;
2455
2456   from = vlib_frame_vector_args (frame);
2457   n_left_from = frame->n_vectors;
2458   next_index = node->cached_next_index;
2459
2460   while (n_left_from > 0)
2461     {
2462       u32 n_left_to_next;
2463
2464       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2465
2466       while (n_left_from >= 4 && n_left_to_next >= 2)
2467         {
2468           u32 bi0, bi1;
2469           vlib_buffer_t *b0, *b1;
2470           u32 next0, next1;
2471           ip6_header_t *ip0, *ip1;
2472           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2473           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2474           u8 error0 = 0, error1 = 0;
2475
2476           /* Prefetch next iteration. */
2477           {
2478             vlib_buffer_t *p2, *p3;
2479
2480             p2 = vlib_get_buffer (vm, from[2]);
2481             p3 = vlib_get_buffer (vm, from[3]);
2482
2483             vlib_prefetch_buffer_header (p2, LOAD);
2484             vlib_prefetch_buffer_header (p3, LOAD);
2485
2486             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2487             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2488           }
2489
2490           /* Speculatively enqueue b0, b1 to the current next frame */
2491           to_next[0] = bi0 = from[0];
2492           to_next[1] = bi1 = from[1];
2493           from += 2;
2494           to_next += 2;
2495           n_left_from -= 2;
2496           n_left_to_next -= 2;
2497
2498           b0 = vlib_get_buffer (vm, bi0);
2499           b1 = vlib_get_buffer (vm, bi1);
2500
2501           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2502           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2503           ip_adjacency_t *adj0 = adj_get (adj_index0);
2504           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2505           ip_adjacency_t *adj1 = adj_get (adj_index1);
2506
2507           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2508           next0 = adj0->lookup_next_index;
2509           next1 = adj1->lookup_next_index;
2510
2511           ip0 = vlib_buffer_get_current (b0);
2512           ip1 = vlib_buffer_get_current (b1);
2513           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2514           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2515           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2516           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2517           limit0 =
2518             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2519                                          ((hbh0->length + 1) << 3));
2520           limit1 =
2521             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2522                                          ((hbh1->length + 1) << 3));
2523
2524           /*
2525            * Basic validity checks
2526            */
2527           if ((hbh0->length + 1) << 3 >
2528               clib_net_to_host_u16 (ip0->payload_length))
2529             {
2530               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2531               next0 = IP_LOOKUP_NEXT_DROP;
2532               goto outdual;
2533             }
2534           /* Scan the set of h-b-h options, process ones that we understand */
2535           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2536
2537           if ((hbh1->length + 1) << 3 >
2538               clib_net_to_host_u16 (ip1->payload_length))
2539             {
2540               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2541               next1 = IP_LOOKUP_NEXT_DROP;
2542               goto outdual;
2543             }
2544           /* Scan the set of h-b-h options, process ones that we understand */
2545           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2546
2547         outdual:
2548           /* Has the classifier flagged this buffer for special treatment? */
2549           if (PREDICT_FALSE
2550               ((error0 == 0)
2551                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2552             next0 = hm->next_override;
2553
2554           /* Has the classifier flagged this buffer for special treatment? */
2555           if (PREDICT_FALSE
2556               ((error1 == 0)
2557                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2558             next1 = hm->next_override;
2559
2560           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2561             {
2562               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2563                 {
2564                   ip6_hop_by_hop_trace_t *t =
2565                     vlib_add_trace (vm, node, b0, sizeof (*t));
2566                   u32 trace_len = (hbh0->length + 1) << 3;
2567                   t->next_index = next0;
2568                   /* Capture the h-b-h option verbatim */
2569                   trace_len =
2570                     trace_len <
2571                     ARRAY_LEN (t->option_data) ? trace_len :
2572                     ARRAY_LEN (t->option_data);
2573                   t->trace_len = trace_len;
2574                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2575                 }
2576               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2577                 {
2578                   ip6_hop_by_hop_trace_t *t =
2579                     vlib_add_trace (vm, node, b1, sizeof (*t));
2580                   u32 trace_len = (hbh1->length + 1) << 3;
2581                   t->next_index = next1;
2582                   /* Capture the h-b-h option verbatim */
2583                   trace_len =
2584                     trace_len <
2585                     ARRAY_LEN (t->option_data) ? trace_len :
2586                     ARRAY_LEN (t->option_data);
2587                   t->trace_len = trace_len;
2588                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2589                 }
2590
2591             }
2592
2593           b0->error = error_node->errors[error0];
2594           b1->error = error_node->errors[error1];
2595
2596           /* verify speculative enqueue, maybe switch current next frame */
2597           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2598                                            n_left_to_next, bi0, bi1, next0,
2599                                            next1);
2600         }
2601
2602       while (n_left_from > 0 && n_left_to_next > 0)
2603         {
2604           u32 bi0;
2605           vlib_buffer_t *b0;
2606           u32 next0;
2607           ip6_header_t *ip0;
2608           ip6_hop_by_hop_header_t *hbh0;
2609           ip6_hop_by_hop_option_t *opt0, *limit0;
2610           u8 error0 = 0;
2611
2612           /* Speculatively enqueue b0 to the current next frame */
2613           bi0 = from[0];
2614           to_next[0] = bi0;
2615           from += 1;
2616           to_next += 1;
2617           n_left_from -= 1;
2618           n_left_to_next -= 1;
2619
2620           b0 = vlib_get_buffer (vm, bi0);
2621           /*
2622            * Default use the next_index from the adjacency.
2623            * A HBH option rarely redirects to a different node
2624            */
2625           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2626           ip_adjacency_t *adj0 = adj_get (adj_index0);
2627           next0 = adj0->lookup_next_index;
2628
2629           ip0 = vlib_buffer_get_current (b0);
2630           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2631           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2632           limit0 =
2633             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2634                                          ((hbh0->length + 1) << 3));
2635
2636           /*
2637            * Basic validity checks
2638            */
2639           if ((hbh0->length + 1) << 3 >
2640               clib_net_to_host_u16 (ip0->payload_length))
2641             {
2642               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2643               next0 = IP_LOOKUP_NEXT_DROP;
2644               goto out0;
2645             }
2646
2647           /* Scan the set of h-b-h options, process ones that we understand */
2648           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2649
2650         out0:
2651           /* Has the classifier flagged this buffer for special treatment? */
2652           if (PREDICT_FALSE
2653               ((error0 == 0)
2654                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2655             next0 = hm->next_override;
2656
2657           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2658             {
2659               ip6_hop_by_hop_trace_t *t =
2660                 vlib_add_trace (vm, node, b0, sizeof (*t));
2661               u32 trace_len = (hbh0->length + 1) << 3;
2662               t->next_index = next0;
2663               /* Capture the h-b-h option verbatim */
2664               trace_len =
2665                 trace_len <
2666                 ARRAY_LEN (t->option_data) ? trace_len :
2667                 ARRAY_LEN (t->option_data);
2668               t->trace_len = trace_len;
2669               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2670             }
2671
2672           b0->error = error_node->errors[error0];
2673
2674           /* verify speculative enqueue, maybe switch current next frame */
2675           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2676                                            n_left_to_next, bi0, next0);
2677         }
2678       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2679     }
2680   return frame->n_vectors;
2681 }
2682
2683 /* *INDENT-OFF* */
2684 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2685 {
2686   .name = "ip6-hop-by-hop",
2687   .sibling_of = "ip6-lookup",
2688   .vector_size = sizeof (u32),
2689   .format_trace = format_ip6_hop_by_hop_trace,
2690   .type = VLIB_NODE_TYPE_INTERNAL,
2691   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2692   .error_strings = ip6_hop_by_hop_error_strings,
2693   .n_next_nodes = 0,
2694 };
2695 /* *INDENT-ON* */
2696
2697 static clib_error_t *
2698 ip6_hop_by_hop_init (vlib_main_t * vm)
2699 {
2700   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2701   clib_memset (hm->options, 0, sizeof (hm->options));
2702   clib_memset (hm->trace, 0, sizeof (hm->trace));
2703   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2704   return (0);
2705 }
2706
2707 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2708
2709 #ifndef CLIB_MARCH_VARIANT
2710 void
2711 ip6_hbh_set_next_override (uword next)
2712 {
2713   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2714
2715   hm->next_override = next;
2716 }
2717
2718 int
2719 ip6_hbh_register_option (u8 option,
2720                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2721                                       ip6_hop_by_hop_option_t * opt),
2722                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2723 {
2724   ip6_main_t *im = &ip6_main;
2725   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2726
2727   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2728
2729   /* Already registered */
2730   if (hm->options[option])
2731     return (-1);
2732
2733   hm->options[option] = options;
2734   hm->trace[option] = trace;
2735
2736   /* Set global variable */
2737   im->hbh_enabled = 1;
2738
2739   return (0);
2740 }
2741
2742 int
2743 ip6_hbh_unregister_option (u8 option)
2744 {
2745   ip6_main_t *im = &ip6_main;
2746   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2747
2748   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2749
2750   /* Not registered */
2751   if (!hm->options[option])
2752     return (-1);
2753
2754   hm->options[option] = NULL;
2755   hm->trace[option] = NULL;
2756
2757   /* Disable global knob if this was the last option configured */
2758   int i;
2759   bool found = false;
2760   for (i = 0; i < 256; i++)
2761     {
2762       if (hm->options[option])
2763         {
2764           found = true;
2765           break;
2766         }
2767     }
2768   if (!found)
2769     im->hbh_enabled = 0;
2770
2771   return (0);
2772 }
2773
2774 /* Global IP6 main. */
2775 ip6_main_t ip6_main;
2776 #endif
2777
2778 static clib_error_t *
2779 ip6_lookup_init (vlib_main_t * vm)
2780 {
2781   ip6_main_t *im = &ip6_main;
2782   clib_error_t *error;
2783   uword i;
2784
2785   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2786     return error;
2787
2788   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2789     {
2790       u32 j, i0, i1;
2791
2792       i0 = i / 32;
2793       i1 = i % 32;
2794
2795       for (j = 0; j < i0; j++)
2796         im->fib_masks[i].as_u32[j] = ~0;
2797
2798       if (i1)
2799         im->fib_masks[i].as_u32[i0] =
2800           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2801     }
2802
2803   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2804
2805   if (im->lookup_table_nbuckets == 0)
2806     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2807
2808   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2809
2810   if (im->lookup_table_size == 0)
2811     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2812
2813   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2814                          "ip6 FIB fwding table",
2815                          im->lookup_table_nbuckets, im->lookup_table_size);
2816   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2817                          "ip6 FIB non-fwding table",
2818                          im->lookup_table_nbuckets, im->lookup_table_size);
2819   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2820                          "ip6 mFIB table",
2821                          im->lookup_table_nbuckets, im->lookup_table_size);
2822
2823   /* Create FIB with index 0 and table id of 0. */
2824   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2825                                      FIB_SOURCE_DEFAULT_ROUTE);
2826   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2827                                       MFIB_SOURCE_DEFAULT_ROUTE);
2828
2829   {
2830     pg_node_t *pn;
2831     pn = pg_get_node (ip6_lookup_node.index);
2832     pn->unformat_edit = unformat_pg_ip6_header;
2833   }
2834
2835   /* Unless explicitly configured, don't process HBH options */
2836   im->hbh_enabled = 0;
2837
2838   {
2839     icmp6_neighbor_solicitation_header_t p;
2840
2841     clib_memset (&p, 0, sizeof (p));
2842
2843     p.ip.ip_version_traffic_class_and_flow_label =
2844       clib_host_to_net_u32 (0x6 << 28);
2845     p.ip.payload_length =
2846       clib_host_to_net_u16 (sizeof (p) -
2847                             STRUCT_OFFSET_OF
2848                             (icmp6_neighbor_solicitation_header_t, neighbor));
2849     p.ip.protocol = IP_PROTOCOL_ICMP6;
2850     p.ip.hop_limit = 255;
2851     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2852
2853     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2854
2855     p.link_layer_option.header.type =
2856       ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2857     p.link_layer_option.header.n_data_u64s =
2858       sizeof (p.link_layer_option) / sizeof (u64);
2859
2860     vlib_packet_template_init (vm,
2861                                &im->discover_neighbor_packet_template,
2862                                &p, sizeof (p),
2863                                /* alloc chunk size */ 8,
2864                                "ip6 neighbor discovery");
2865   }
2866
2867   return error;
2868 }
2869
2870 VLIB_INIT_FUNCTION (ip6_lookup_init);
2871
2872 static clib_error_t *
2873 test_ip6_link_command_fn (vlib_main_t * vm,
2874                           unformat_input_t * input, vlib_cli_command_t * cmd)
2875 {
2876   u8 mac[6];
2877   ip6_address_t _a, *a = &_a;
2878
2879   if (unformat (input, "%U", unformat_ethernet_address, mac))
2880     {
2881       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2882       vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
2883       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2884       vlib_cli_output (vm, "Original MAC address: %U",
2885                        format_ethernet_address, mac);
2886     }
2887
2888   return 0;
2889 }
2890
2891 /*?
2892  * This command converts the given MAC Address into an IPv6 link-local
2893  * address.
2894  *
2895  * @cliexpar
2896  * Example of how to create an IPv6 link-local address:
2897  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2898  * Link local address: fe80::14d9:e0ff:fe91:7986
2899  * Original MAC address: 16:d9:e0:91:79:86
2900  * @cliexend
2901 ?*/
2902 /* *INDENT-OFF* */
2903 VLIB_CLI_COMMAND (test_link_command, static) =
2904 {
2905   .path = "test ip6 link",
2906   .function = test_ip6_link_command_fn,
2907   .short_help = "test ip6 link <mac-address>",
2908 };
2909 /* *INDENT-ON* */
2910
2911 #ifndef CLIB_MARCH_VARIANT
2912 int
2913 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2914 {
2915   u32 fib_index;
2916
2917   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2918
2919   if (~0 == fib_index)
2920     return VNET_API_ERROR_NO_SUCH_FIB;
2921
2922   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2923                                   flow_hash_config);
2924
2925   return 0;
2926 }
2927 #endif
2928
2929 static clib_error_t *
2930 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2931                               unformat_input_t * input,
2932                               vlib_cli_command_t * cmd)
2933 {
2934   int matched = 0;
2935   u32 table_id = 0;
2936   u32 flow_hash_config = 0;
2937   int rv;
2938
2939   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2940     {
2941       if (unformat (input, "table %d", &table_id))
2942         matched = 1;
2943 #define _(a,v) \
2944     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2945       foreach_flow_hash_bit
2946 #undef _
2947         else
2948         break;
2949     }
2950
2951   if (matched == 0)
2952     return clib_error_return (0, "unknown input `%U'",
2953                               format_unformat_error, input);
2954
2955   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2956   switch (rv)
2957     {
2958     case 0:
2959       break;
2960
2961     case -1:
2962       return clib_error_return (0, "no such FIB table %d", table_id);
2963
2964     default:
2965       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2966       break;
2967     }
2968
2969   return 0;
2970 }
2971
2972 /*?
2973  * Configure the set of IPv6 fields used by the flow hash.
2974  *
2975  * @cliexpar
2976  * @parblock
2977  * Example of how to set the flow hash on a given table:
2978  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2979  *
2980  * Example of display the configured flow hash:
2981  * @cliexstart{show ip6 fib}
2982  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2983  * @::/0
2984  *   unicast-ip6-chain
2985  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2986  *     [0] [@0]: dpo-drop ip6
2987  * fe80::/10
2988  *   unicast-ip6-chain
2989  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2990  *     [0] [@2]: dpo-receive
2991  * ff02::1/128
2992  *   unicast-ip6-chain
2993  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2994  *     [0] [@2]: dpo-receive
2995  * ff02::2/128
2996  *   unicast-ip6-chain
2997  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2998  *     [0] [@2]: dpo-receive
2999  * ff02::16/128
3000  *   unicast-ip6-chain
3001  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
3002  *     [0] [@2]: dpo-receive
3003  * ff02::1:ff00:0/104
3004  *   unicast-ip6-chain
3005  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
3006  *     [0] [@2]: dpo-receive
3007  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
3008  * @::/0
3009  *   unicast-ip6-chain
3010  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3011  *     [0] [@0]: dpo-drop ip6
3012  * @::a:1:1:0:4/126
3013  *   unicast-ip6-chain
3014  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
3015  *     [0] [@4]: ipv6-glean: af_packet0
3016  * @::a:1:1:0:7/128
3017  *   unicast-ip6-chain
3018  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
3019  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
3020  * fe80::/10
3021  *   unicast-ip6-chain
3022  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
3023  *     [0] [@2]: dpo-receive
3024  * fe80::fe:3eff:fe3e:9222/128
3025  *   unicast-ip6-chain
3026  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
3027  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
3028  * ff02::1/128
3029  *   unicast-ip6-chain
3030  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
3031  *     [0] [@2]: dpo-receive
3032  * ff02::2/128
3033  *   unicast-ip6-chain
3034  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
3035  *     [0] [@2]: dpo-receive
3036  * ff02::16/128
3037  *   unicast-ip6-chain
3038  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
3039  *     [0] [@2]: dpo-receive
3040  * ff02::1:ff00:0/104
3041  *   unicast-ip6-chain
3042  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
3043  *     [0] [@2]: dpo-receive
3044  * @cliexend
3045  * @endparblock
3046 ?*/
3047 /* *INDENT-OFF* */
3048 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
3049 {
3050   .path = "set ip6 flow-hash",
3051   .short_help =
3052   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3053   .function = set_ip6_flow_hash_command_fn,
3054 };
3055 /* *INDENT-ON* */
3056
3057 static clib_error_t *
3058 show_ip6_local_command_fn (vlib_main_t * vm,
3059                            unformat_input_t * input, vlib_cli_command_t * cmd)
3060 {
3061   ip6_main_t *im = &ip6_main;
3062   ip_lookup_main_t *lm = &im->lookup_main;
3063   int i;
3064
3065   vlib_cli_output (vm, "Protocols handled by ip6_local");
3066   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
3067     {
3068       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3069         {
3070
3071           u32 node_index = vlib_get_node (vm,
3072                                           ip6_local_node.index)->
3073             next_nodes[lm->local_next_by_ip_protocol[i]];
3074           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
3075                            node_index);
3076         }
3077     }
3078   return 0;
3079 }
3080
3081
3082
3083 /*?
3084  * Display the set of protocols handled by the local IPv6 stack.
3085  *
3086  * @cliexpar
3087  * Example of how to display local protocol table:
3088  * @cliexstart{show ip6 local}
3089  * Protocols handled by ip6_local
3090  * 17
3091  * 43
3092  * 58
3093  * 115
3094  * @cliexend
3095 ?*/
3096 /* *INDENT-OFF* */
3097 VLIB_CLI_COMMAND (show_ip6_local, static) =
3098 {
3099   .path = "show ip6 local",
3100   .function = show_ip6_local_command_fn,
3101   .short_help = "show ip6 local",
3102 };
3103 /* *INDENT-ON* */
3104
3105 #ifndef CLIB_MARCH_VARIANT
3106 int
3107 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3108                              u32 table_index)
3109 {
3110   vnet_main_t *vnm = vnet_get_main ();
3111   vnet_interface_main_t *im = &vnm->interface_main;
3112   ip6_main_t *ipm = &ip6_main;
3113   ip_lookup_main_t *lm = &ipm->lookup_main;
3114   vnet_classify_main_t *cm = &vnet_classify_main;
3115   ip6_address_t *if_addr;
3116
3117   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3118     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3119
3120   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3121     return VNET_API_ERROR_NO_SUCH_ENTRY;
3122
3123   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3124   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3125
3126   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3127
3128   if (NULL != if_addr)
3129     {
3130       fib_prefix_t pfx = {
3131         .fp_len = 128,
3132         .fp_proto = FIB_PROTOCOL_IP6,
3133         .fp_addr.ip6 = *if_addr,
3134       };
3135       u32 fib_index;
3136
3137       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3138                                                        sw_if_index);
3139
3140
3141       if (table_index != (u32) ~ 0)
3142         {
3143           dpo_id_t dpo = DPO_INVALID;
3144
3145           dpo_set (&dpo,
3146                    DPO_CLASSIFY,
3147                    DPO_PROTO_IP6,
3148                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3149
3150           fib_table_entry_special_dpo_add (fib_index,
3151                                            &pfx,
3152                                            FIB_SOURCE_CLASSIFY,
3153                                            FIB_ENTRY_FLAG_NONE, &dpo);
3154           dpo_reset (&dpo);
3155         }
3156       else
3157         {
3158           fib_table_entry_special_remove (fib_index,
3159                                           &pfx, FIB_SOURCE_CLASSIFY);
3160         }
3161     }
3162
3163   return 0;
3164 }
3165 #endif
3166
3167 static clib_error_t *
3168 set_ip6_classify_command_fn (vlib_main_t * vm,
3169                              unformat_input_t * input,
3170                              vlib_cli_command_t * cmd)
3171 {
3172   u32 table_index = ~0;
3173   int table_index_set = 0;
3174   u32 sw_if_index = ~0;
3175   int rv;
3176
3177   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3178     {
3179       if (unformat (input, "table-index %d", &table_index))
3180         table_index_set = 1;
3181       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3182                          vnet_get_main (), &sw_if_index))
3183         ;
3184       else
3185         break;
3186     }
3187
3188   if (table_index_set == 0)
3189     return clib_error_return (0, "classify table-index must be specified");
3190
3191   if (sw_if_index == ~0)
3192     return clib_error_return (0, "interface / subif must be specified");
3193
3194   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3195
3196   switch (rv)
3197     {
3198     case 0:
3199       break;
3200
3201     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3202       return clib_error_return (0, "No such interface");
3203
3204     case VNET_API_ERROR_NO_SUCH_ENTRY:
3205       return clib_error_return (0, "No such classifier table");
3206     }
3207   return 0;
3208 }
3209
3210 /*?
3211  * Assign a classification table to an interface. The classification
3212  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3213  * commands. Once the table is create, use this command to filter packets
3214  * on an interface.
3215  *
3216  * @cliexpar
3217  * Example of how to assign a classification table to an interface:
3218  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3219 ?*/
3220 /* *INDENT-OFF* */
3221 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3222 {
3223   .path = "set ip6 classify",
3224   .short_help =
3225   "set ip6 classify intfc <interface> table-index <classify-idx>",
3226   .function = set_ip6_classify_command_fn,
3227 };
3228 /* *INDENT-ON* */
3229
3230 static clib_error_t *
3231 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3232 {
3233   ip6_main_t *im = &ip6_main;
3234   uword heapsize = 0;
3235   u32 tmp;
3236   u32 nbuckets = 0;
3237
3238   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3239     {
3240       if (unformat (input, "hash-buckets %d", &tmp))
3241         nbuckets = tmp;
3242       else if (unformat (input, "heap-size %U",
3243                          unformat_memory_size, &heapsize))
3244         ;
3245       else
3246         return clib_error_return (0, "unknown input '%U'",
3247                                   format_unformat_error, input);
3248     }
3249
3250   im->lookup_table_nbuckets = nbuckets;
3251   im->lookup_table_size = heapsize;
3252
3253   return 0;
3254 }
3255
3256 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3257
3258 /*
3259  * fd.io coding-style-patch-verification: ON
3260  *
3261  * Local Variables:
3262  * eval: (c-set-style "gnu")
3263  * End:
3264  */