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_link.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 #include <vnet/classify/vnet_classify.h>
  53
  54 #ifndef CLIB_MARCH_VARIANT
  55 #include <vppinfra/bihash_template.c>
  56 #endif
  57 #include <vnet/ip/ip6_forward.h>
  58 #include <vnet/interface_output.h>
  59
  60 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  61 #define OI_DECAP   0x80000000
  62
  63 static void
  64 ip6_add_interface_prefix_routes (ip6_main_t * im,
  65                                  u32 sw_if_index,
  66                                  u32 fib_index,
  67                                  ip6_address_t * address, u32 address_length)
  68 {
  69   ip_lookup_main_t *lm = &im->lookup_main;
  70   ip_interface_prefix_t *if_prefix;
  71
  72   /* *INDENT-OFF* */
  73   ip_interface_prefix_key_t key = {
  74     .prefix = {
  75       .fp_len = address_length,
  76       .fp_proto = FIB_PROTOCOL_IP6,
  77       .fp_addr.ip6 = {
  78         .as_u64 = {
  79           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
  80           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
  81         },
  82       },
  83     },
  84     .sw_if_index = sw_if_index,
  85   };
  86   /* *INDENT-ON* */
  87
  88   /* If prefix already set on interface, just increment ref count & return */
  89   if_prefix = ip_get_interface_prefix (lm, &key);
  90   if (if_prefix)
  91     {
  92       if_prefix->ref_count += 1;
  93       return;
  94     }
  95
  96   /* New prefix - allocate a pool entry, initialize it, add to the hash */
  97   pool_get (lm->if_prefix_pool, if_prefix);
  98   if_prefix->ref_count = 1;
  99   clib_memcpy (&if_prefix->key, &key, sizeof (key));
 100   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 101              if_prefix - lm->if_prefix_pool, 0 /* old value */ );
 102
 103   /* length < 128 - add glean */
 104   if (address_length < 128)
 105     {
 106       /* set the glean route for the prefix */
 107       fib_table_entry_update_one_path (fib_index, &key.prefix,
 108                                        FIB_SOURCE_INTERFACE,
 109                                        (FIB_ENTRY_FLAG_CONNECTED |
 110                                         FIB_ENTRY_FLAG_ATTACHED),
 111                                        DPO_PROTO_IP6,
 112                                        /* No next-hop address */
 113                                        NULL, sw_if_index,
 114                                        /* invalid FIB index */
 115                                        ~0, 1,
 116                                        /* no out-label stack */
 117                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
 118     }
 119 }
 120
 121 static void
 122 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 123                           ip6_main_t * im, u32 fib_index,
 124                           ip_interface_address_t * a)
 125 {
 126   ip_lookup_main_t *lm = &im->lookup_main;
 127   ip6_address_t *address = ip_interface_address_get_address (lm, a);
 128   fib_prefix_t pfx = {
 129     .fp_len = a->address_length,
 130     .fp_proto = FIB_PROTOCOL_IP6,
 131     .fp_addr.ip6 = *address,
 132   };
 133
 134   /* set special routes for the prefix if needed */
 135   ip6_add_interface_prefix_routes (im, sw_if_index, fib_index,
 136                                    address, a->address_length);
 137
 138   pfx.fp_len = 128;
 139   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 140     {
 141       u32 classify_table_index =
 142         lm->classify_table_index_by_sw_if_index[sw_if_index];
 143       if (classify_table_index != (u32) ~ 0)
 144         {
 145           dpo_id_t dpo = DPO_INVALID;
 146
 147           dpo_set (&dpo,
 148                    DPO_CLASSIFY,
 149                    DPO_PROTO_IP6,
 150                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 151
 152           fib_table_entry_special_dpo_add (fib_index,
 153                                            &pfx,
 154                                            FIB_SOURCE_CLASSIFY,
 155                                            FIB_ENTRY_FLAG_NONE, &dpo);
 156           dpo_reset (&dpo);
 157         }
 158     }
 159
 160   fib_table_entry_update_one_path (fib_index, &pfx,
 161                                    FIB_SOURCE_INTERFACE,
 162                                    (FIB_ENTRY_FLAG_CONNECTED |
 163                                     FIB_ENTRY_FLAG_LOCAL),
 164                                    DPO_PROTO_IP6,
 165                                    &pfx.fp_addr,
 166                                    sw_if_index, ~0,
 167                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 168 }
 169
 170 static void
 171 ip6_del_interface_prefix_routes (ip6_main_t * im,
 172                                  u32 sw_if_index,
 173                                  u32 fib_index,
 174                                  ip6_address_t * address, u32 address_length)
 175 {
 176   ip_lookup_main_t *lm = &im->lookup_main;
 177   ip_interface_prefix_t *if_prefix;
 178
 179   /* *INDENT-OFF* */
 180   ip_interface_prefix_key_t key = {
 181     .prefix = {
 182       .fp_len = address_length,
 183       .fp_proto = FIB_PROTOCOL_IP6,
 184       .fp_addr.ip6 = {
 185         .as_u64 = {
 186           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
 187           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
 188         },
 189       },
 190     },
 191     .sw_if_index = sw_if_index,
 192   };
 193   /* *INDENT-ON* */
 194
 195   if_prefix = ip_get_interface_prefix (lm, &key);
 196   if (!if_prefix)
 197     {
 198       clib_warning ("Prefix not found while deleting %U",
 199                     format_ip4_address_and_length, address, address_length);
 200       return;
 201     }
 202
 203   /* If not deleting last intf addr in prefix, decrement ref count & return */
 204   if_prefix->ref_count -= 1;
 205   if (if_prefix->ref_count > 0)
 206     return;
 207
 208   /* length <= 128, delete glean route */
 209   if (address_length <= 128)
 210     {
 211       /* remove glean route for prefix */
 212       fib_table_entry_delete (fib_index, &key.prefix, FIB_SOURCE_INTERFACE);
 213     }
 214
 215   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */ );
 216   pool_put (lm->if_prefix_pool, if_prefix);
 217 }
 218
 219 static void
 220 ip6_del_interface_routes (u32 sw_if_index, ip6_main_t * im,
 221                           u32 fib_index,
 222                           ip6_address_t * address, u32 address_length)
 223 {
 224   fib_prefix_t pfx = {
 225     .fp_len = 128,
 226     .fp_proto = FIB_PROTOCOL_IP6,
 227     .fp_addr.ip6 = *address,
 228   };
 229
 230   /* delete special routes for the prefix if needed */
 231   ip6_del_interface_prefix_routes (im, sw_if_index, fib_index,
 232                                    address, address_length);
 233
 234   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 235 }
 236
 237 #ifndef CLIB_MARCH_VARIANT
 238 void
 239 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 240 {
 241   ip6_main_t *im = &ip6_main;
 242   vnet_main_t *vnm = vnet_get_main ();
 243   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 244
 245   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 246
 247   /*
 248    * enable/disable only on the 1<->0 transition
 249    */
 250   if (is_enable)
 251     {
 252       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 253         return;
 254     }
 255   else
 256     {
 257       /* The ref count is 0 when an address is removed from an interface that has
 258        * no address - this is not a ciritical error */
 259       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 260           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 261         return;
 262     }
 263
 264   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 265                                !is_enable, 0, 0);
 266
 267   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 268                                sw_if_index, !is_enable, 0, 0);
 269
 270   if (is_enable)
 271     hi->l3_if_count++;
 272   else if (hi->l3_if_count)
 273     hi->l3_if_count--;
 274 }
 275
 276 /* get first interface address */
 277 ip6_address_t *
 278 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 279 {
 280   ip_lookup_main_t *lm = &im->lookup_main;
 281   ip_interface_address_t *ia = 0;
 282   ip6_address_t *result = 0;
 283
 284   /* *INDENT-OFF* */
 285   foreach_ip_interface_address (lm, ia, sw_if_index,
 286                                 1 /* honor unnumbered */,
 287   ({
 288     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 289     result = a;
 290     break;
 291   }));
 292   /* *INDENT-ON* */
 293   return result;
 294 }
 295
 296 clib_error_t *
 297 ip6_add_del_interface_address (vlib_main_t * vm,
 298                                u32 sw_if_index,
 299                                ip6_address_t * address,
 300                                u32 address_length, u32 is_del)
 301 {
 302   vnet_main_t *vnm = vnet_get_main ();
 303   ip6_main_t *im = &ip6_main;
 304   ip_lookup_main_t *lm = &im->lookup_main;
 305   clib_error_t *error = NULL;
 306   u32 if_address_index;
 307   ip6_address_fib_t ip6_af, *addr_fib = 0;
 308   const ip6_address_t *ll_addr;
 309
 310   /* local0 interface doesn't support IP addressing */
 311   if (sw_if_index == 0)
 312     {
 313       return
 314         clib_error_create ("local0 interface doesn't support IP addressing");
 315     }
 316
 317   if (ip6_address_is_link_local_unicast (address))
 318     {
 319       if (address_length != 128)
 320         {
 321           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 322           return
 323             clib_error_create
 324             ("prefix length of link-local address must be 128");
 325         }
 326       if (!is_del)
 327         {
 328           int rv;
 329
 330           rv = ip6_link_set_local_address (sw_if_index, address);
 331
 332           if (rv)
 333             {
 334               vnm->api_errno = rv;
 335               return clib_error_create ("address not assignable");
 336             }
 337         }
 338       else
 339         {
 340           ll_addr = ip6_get_link_local_address (sw_if_index);
 341           if (ip6_address_is_equal (ll_addr, address))
 342             {
 343               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 344               return clib_error_create ("address not deletable");
 345             }
 346           else
 347             {
 348               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 349               return clib_error_create ("address not found");
 350             }
 351         }
 352
 353       return (NULL);
 354     }
 355
 356   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 357   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 358
 359   ip6_addr_fib_init (&ip6_af, address,
 360                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 361   vec_add1 (addr_fib, ip6_af);
 362
 363   /* *INDENT-OFF* */
 364   if (!is_del)
 365     {
 366       /* When adding an address check that it does not conflict
 367          with an existing address on any interface in this table. */
 368       ip_interface_address_t *ia;
 369       vnet_sw_interface_t *sif;
 370
 371       pool_foreach (sif, vnm->interface_main.sw_interfaces)
 372        {
 373           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 374               im->fib_index_by_sw_if_index[sif->sw_if_index])
 375             {
 376               foreach_ip_interface_address
 377                 (&im->lookup_main, ia, sif->sw_if_index,
 378                  0 /* honor unnumbered */ ,
 379                  ({
 380                    ip6_address_t * x =
 381                      ip_interface_address_get_address
 382                      (&im->lookup_main, ia);
 383
 384                    if (ip6_destination_matches_route
 385                        (im, address, x, ia->address_length) ||
 386                        ip6_destination_matches_route (im,
 387                                                       x,
 388                                                       address,
 389                                                       address_length))
 390                      {
 391                        /* an intf may have >1 addr from the same prefix */
 392                        if ((sw_if_index == sif->sw_if_index) &&
 393                            (ia->address_length == address_length) &&
 394                            !ip6_address_is_equal (x, address))
 395                          continue;
 396
 397                        if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 398                          /* if the address we're comparing against is stale
 399                           * then the CP has not added this one back yet, maybe
 400                           * it never will, so we have to assume it won't and
 401                           * ignore it. if it does add it back, then it will fail
 402                           * because this one is now present */
 403                          continue;
 404
 405                        /* error if the length or intf was different */
 406                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 407                        error =  clib_error_create
 408                          ("failed to add %U which conflicts with %U for interface %U",
 409                           format_ip6_address_and_length, address,
 410                           address_length,
 411                           format_ip6_address_and_length, x,
 412                           ia->address_length,
 413                           format_vnet_sw_if_index_name, vnm,
 414                           sif->sw_if_index);
 415                        goto done;
 416                      }
 417                  }));
 418             }
 419       }
 420     }
 421   /* *INDENT-ON* */
 422
 423   if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
 424
 425   if (is_del)
 426     {
 427       if (~0 == if_address_index)
 428         {
 429           vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 430           error = clib_error_create ("%U not found for interface %U",
 431                                      lm->format_address_and_length,
 432                                      addr_fib, address_length,
 433                                      format_vnet_sw_if_index_name, vnm,
 434                                      sw_if_index);
 435           goto done;
 436         }
 437
 438       error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
 439                                         address_length, sw_if_index);
 440       if (error)
 441         goto done;
 442     }
 443   else
 444     {
 445       if (~0 != if_address_index)
 446         {
 447           ip_interface_address_t *ia;
 448
 449           ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
 450
 451           if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 452             {
 453               if (ia->sw_if_index == sw_if_index)
 454                 {
 455                   /* re-adding an address during the replace action.
 456                    * consdier this the update. clear the flag and
 457                    * we're done */
 458                   ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
 459                   goto done;
 460                 }
 461               else
 462                 {
 463                   /* The prefix is moving from one interface to another.
 464                    * delete the stale and add the new */
 465                   ip6_add_del_interface_address (vm,
 466                                                  ia->sw_if_index,
 467                                                  address, address_length, 1);
 468                   ia = NULL;
 469                   error = ip_interface_address_add (lm, sw_if_index,
 470                                                     addr_fib, address_length,
 471                                                     &if_address_index);
 472                 }
 473             }
 474           else
 475             {
 476               vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 477               error = clib_error_create
 478                 ("Prefix %U already found on interface %U",
 479                  lm->format_address_and_length, addr_fib, address_length,
 480                  format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
 481             }
 482         }
 483       else
 484         error = ip_interface_address_add (lm, sw_if_index,
 485                                           addr_fib, address_length,
 486                                           &if_address_index);
 487     }
 488
 489   if (error)
 490     goto done;
 491
 492   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 493   if (!is_del)
 494     ip6_link_enable (sw_if_index, NULL);
 495
 496   /* intf addr routes are added/deleted on admin up/down */
 497   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 498     {
 499       if (is_del)
 500         ip6_del_interface_routes (sw_if_index,
 501                                   im, ip6_af.fib_index, address,
 502                                   address_length);
 503       else
 504         ip6_add_interface_routes (vnm, sw_if_index,
 505                                   im, ip6_af.fib_index,
 506                                   pool_elt_at_index (lm->if_address_pool,
 507                                                      if_address_index));
 508     }
 509
 510   ip6_add_del_interface_address_callback_t *cb;
 511   vec_foreach (cb, im->add_del_interface_address_callbacks)
 512     cb->function (im, cb->function_opaque, sw_if_index,
 513                   address, address_length, if_address_index, is_del);
 514
 515   if (is_del)
 516     ip6_link_disable (sw_if_index);
 517
 518 done:
 519   vec_free (addr_fib);
 520   return error;
 521 }
 522
 523 #endif
 524
 525 static clib_error_t *
 526 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 527 {
 528   ip6_main_t *im = &ip6_main;
 529   ip_interface_address_t *ia;
 530   ip6_address_t *a;
 531   u32 is_admin_up, fib_index;
 532
 533   /* Fill in lookup tables with default table (0). */
 534   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 535
 536   vec_validate_init_empty (im->
 537                            lookup_main.if_address_pool_index_by_sw_if_index,
 538                            sw_if_index, ~0);
 539
 540   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 541
 542   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 543
 544   /* *INDENT-OFF* */
 545   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 546                                 0 /* honor unnumbered */,
 547   ({
 548     a = ip_interface_address_get_address (&im->lookup_main, ia);
 549     if (is_admin_up)
 550       ip6_add_interface_routes (vnm, sw_if_index,
 551                                 im, fib_index,
 552                                 ia);
 553     else
 554       ip6_del_interface_routes (sw_if_index, im, fib_index,
 555                                 a, ia->address_length);
 556   }));
 557   /* *INDENT-ON* */
 558
 559   return 0;
 560 }
 561
 562 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 563
 564 /* Built-in ip6 unicast rx feature path definition */
 565 /* *INDENT-OFF* */
 566 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 567 {
 568   .arc_name  = "ip6-unicast",
 569   .start_nodes = VNET_FEATURES ("ip6-input"),
 570   .last_in_arc = "ip6-lookup",
 571   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 572 };
 573
 574 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 575 {
 576   .arc_name = "ip6-unicast",
 577   .node_name = "ip6-flow-classify",
 578   .runs_before = VNET_FEATURES ("ip6-inacl"),
 579 };
 580
 581 VNET_FEATURE_INIT (ip6_inacl, static) =
 582 {
 583   .arc_name = "ip6-unicast",
 584   .node_name = "ip6-inacl",
 585   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 586 };
 587
 588 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 589 {
 590   .arc_name = "ip6-unicast",
 591   .node_name = "ip6-policer-classify",
 592   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 593 };
 594
 595 VNET_FEATURE_INIT (ip6_ipsec, static) =
 596 {
 597   .arc_name = "ip6-unicast",
 598   .node_name = "ipsec6-input-feature",
 599   .runs_before = VNET_FEATURES ("l2tp-decap"),
 600 };
 601
 602 VNET_FEATURE_INIT (ip6_l2tp, static) =
 603 {
 604   .arc_name = "ip6-unicast",
 605   .node_name = "l2tp-decap",
 606   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 607 };
 608
 609 VNET_FEATURE_INIT (ip6_vpath, static) =
 610 {
 611   .arc_name = "ip6-unicast",
 612   .node_name = "vpath-input-ip6",
 613   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 614 };
 615
 616 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 617 {
 618   .arc_name = "ip6-unicast",
 619   .node_name = "ip6-vxlan-bypass",
 620   .runs_before = VNET_FEATURES ("ip6-lookup"),
 621 };
 622
 623 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 624 {
 625   .arc_name = "ip6-unicast",
 626   .node_name = "ip6-not-enabled",
 627   .runs_before = VNET_FEATURES ("ip6-lookup"),
 628 };
 629
 630 VNET_FEATURE_INIT (ip6_lookup, static) =
 631 {
 632   .arc_name = "ip6-unicast",
 633   .node_name = "ip6-lookup",
 634   .runs_before = 0,  /*last feature*/
 635 };
 636
 637 /* Built-in ip6 multicast rx feature path definition (none now) */
 638 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 639 {
 640   .arc_name  = "ip6-multicast",
 641   .start_nodes = VNET_FEATURES ("ip6-input"),
 642   .last_in_arc = "ip6-mfib-forward-lookup",
 643   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 644 };
 645
 646 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 647   .arc_name = "ip6-multicast",
 648   .node_name = "vpath-input-ip6",
 649   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 650 };
 651
 652 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 653   .arc_name = "ip6-multicast",
 654   .node_name = "ip6-not-enabled",
 655   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 656 };
 657
 658 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 659   .arc_name = "ip6-multicast",
 660   .node_name = "ip6-mfib-forward-lookup",
 661   .runs_before = 0, /* last feature */
 662 };
 663
 664 /* Built-in ip4 tx feature path definition */
 665 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 666 {
 667   .arc_name  = "ip6-output",
 668   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 669   .last_in_arc = "interface-output",
 670   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 671 };
 672
 673 VNET_FEATURE_INIT (ip6_outacl, static) = {
 674   .arc_name = "ip6-output",
 675   .node_name = "ip6-outacl",
 676   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 677 };
 678
 679 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 680   .arc_name = "ip6-output",
 681   .node_name = "ipsec6-output-feature",
 682   .runs_before = VNET_FEATURES ("interface-output"),
 683 };
 684
 685 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 686   .arc_name = "ip6-output",
 687   .node_name = "interface-output",
 688   .runs_before = 0, /* not before any other features */
 689 };
 690 /* *INDENT-ON* */
 691
 692 static clib_error_t *
 693 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 694 {
 695   ip6_main_t *im = &ip6_main;
 696
 697   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 698   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 699
 700   if (!is_add)
 701     {
 702       /* Ensure that IPv6 is disabled */
 703       ip6_main_t *im6 = &ip6_main;
 704       ip_lookup_main_t *lm6 = &im6->lookup_main;
 705       ip_interface_address_t *ia = 0;
 706       ip6_address_t *address;
 707       vlib_main_t *vm = vlib_get_main ();
 708
 709       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 710       /* *INDENT-OFF* */
 711       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 712       ({
 713         address = ip_interface_address_get_address (lm6, ia);
 714         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 715       }));
 716       /* *INDENT-ON* */
 717       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 718     }
 719
 720   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 721                                is_add, 0, 0);
 722
 723   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 724                                sw_if_index, is_add, 0, 0);
 725
 726   return /* no error */ 0;
 727 }
 728
 729 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 730
 731 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 732                                 vlib_node_runtime_t * node,
 733                                 vlib_frame_t * frame)
 734 {
 735   return ip6_lookup_inline (vm, node, frame);
 736 }
 737
 738 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 739
 740 /* *INDENT-OFF* */
 741 VLIB_REGISTER_NODE (ip6_lookup_node) =
 742 {
 743   .name = "ip6-lookup",
 744   .vector_size = sizeof (u32),
 745   .format_trace = format_ip6_lookup_trace,
 746   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 747   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 748 };
 749 /* *INDENT-ON* */
 750
 751 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 752                                       vlib_node_runtime_t * node,
 753                                       vlib_frame_t * frame)
 754 {
 755   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 756   u32 n_left, *from;
 757   u32 thread_index = vm->thread_index;
 758   ip6_main_t *im = &ip6_main;
 759   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 760   u16 nexts[VLIB_FRAME_SIZE], *next;
 761
 762   from = vlib_frame_vector_args (frame);
 763   n_left = frame->n_vectors;
 764   next = nexts;
 765
 766   vlib_get_buffers (vm, from, bufs, n_left);
 767
 768   while (n_left >= 4)
 769     {
 770       const load_balance_t *lb0, *lb1;
 771       const ip6_header_t *ip0, *ip1;
 772       u32 lbi0, hc0, lbi1, hc1;
 773       const dpo_id_t *dpo0, *dpo1;
 774
 775       /* Prefetch next iteration. */
 776       {
 777         vlib_prefetch_buffer_header (b[2], STORE);
 778         vlib_prefetch_buffer_header (b[3], STORE);
 779
 780         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 781         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 782       }
 783
 784       ip0 = vlib_buffer_get_current (b[0]);
 785       ip1 = vlib_buffer_get_current (b[1]);
 786       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 787       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 788
 789       lb0 = load_balance_get (lbi0);
 790       lb1 = load_balance_get (lbi1);
 791
 792       /*
 793        * this node is for via FIBs we can re-use the hash value from the
 794        * to node if present.
 795        * We don't want to use the same hash value at each level in the recursion
 796        * graph as that would lead to polarisation
 797        */
 798       hc0 = hc1 = 0;
 799
 800       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 801         {
 802           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 803             {
 804               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 805                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 806             }
 807           else
 808             {
 809               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 810                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 811             }
 812           dpo0 = load_balance_get_fwd_bucket
 813             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 814         }
 815       else
 816         {
 817           dpo0 = load_balance_get_bucket_i (lb0, 0);
 818         }
 819       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 820         {
 821           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 822             {
 823               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 824                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 825             }
 826           else
 827             {
 828               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 829                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 830             }
 831           dpo1 = load_balance_get_fwd_bucket
 832             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 833         }
 834       else
 835         {
 836           dpo1 = load_balance_get_bucket_i (lb1, 0);
 837         }
 838
 839       next[0] = dpo0->dpoi_next_node;
 840       next[1] = dpo1->dpoi_next_node;
 841
 842       /* Only process the HBH Option Header if explicitly configured to do so */
 843       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 844         {
 845           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 846             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 847         }
 848       /* Only process the HBH Option Header if explicitly configured to do so */
 849       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 850         {
 851           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 852             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 853         }
 854
 855       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 856       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 857
 858       vlib_increment_combined_counter
 859         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 860       vlib_increment_combined_counter
 861         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 862
 863       b += 2;
 864       next += 2;
 865       n_left -= 2;
 866     }
 867
 868   while (n_left > 0)
 869     {
 870       const load_balance_t *lb0;
 871       const ip6_header_t *ip0;
 872       const dpo_id_t *dpo0;
 873       u32 lbi0, hc0;
 874
 875       ip0 = vlib_buffer_get_current (b[0]);
 876       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 877
 878       lb0 = load_balance_get (lbi0);
 879
 880       hc0 = 0;
 881       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 882         {
 883           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 884             {
 885               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 886                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 887             }
 888           else
 889             {
 890               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 891                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 892             }
 893           dpo0 = load_balance_get_fwd_bucket
 894             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 895         }
 896       else
 897         {
 898           dpo0 = load_balance_get_bucket_i (lb0, 0);
 899         }
 900
 901       next[0] = dpo0->dpoi_next_node;
 902       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 903
 904       /* Only process the HBH Option Header if explicitly configured to do so */
 905       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 906         {
 907           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 908             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 909         }
 910
 911       vlib_increment_combined_counter
 912         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 913
 914       b += 1;
 915       next += 1;
 916       n_left -= 1;
 917     }
 918
 919   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 920
 921   if (node->flags & VLIB_NODE_FLAG_TRACE)
 922     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 923
 924   return frame->n_vectors;
 925 }
 926
 927 /* *INDENT-OFF* */
 928 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 929 {
 930   .name = "ip6-load-balance",
 931   .vector_size = sizeof (u32),
 932   .sibling_of = "ip6-lookup",
 933   .format_trace = format_ip6_lookup_trace,
 934 };
 935 /* *INDENT-ON* */
 936
 937 typedef struct
 938 {
 939   /* Adjacency taken. */
 940   u32 adj_index;
 941   u32 flow_hash;
 942   u32 fib_index;
 943
 944   /* Packet data, possibly *after* rewrite. */
 945   u8 packet_data[128 - 1 * sizeof (u32)];
 946 }
 947 ip6_forward_next_trace_t;
 948
 949 #ifndef CLIB_MARCH_VARIANT
 950 u8 *
 951 format_ip6_forward_next_trace (u8 * s, va_list * args)
 952 {
 953   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 954   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 955   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 956   u32 indent = format_get_indent (s);
 957
 958   s = format (s, "%Ufib:%d adj:%d flow:%d",
 959               format_white_space, indent,
 960               t->fib_index, t->adj_index, t->flow_hash);
 961   s = format (s, "\n%U%U",
 962               format_white_space, indent,
 963               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 964   return s;
 965 }
 966 #endif
 967
 968 static u8 *
 969 format_ip6_lookup_trace (u8 * s, va_list * args)
 970 {
 971   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 972   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 973   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 974   u32 indent = format_get_indent (s);
 975
 976   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 977               t->fib_index, t->adj_index, t->flow_hash);
 978   s = format (s, "\n%U%U",
 979               format_white_space, indent,
 980               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 981   return s;
 982 }
 983
 984
 985 static u8 *
 986 format_ip6_rewrite_trace (u8 * s, va_list * args)
 987 {
 988   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 989   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 990   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 991   u32 indent = format_get_indent (s);
 992
 993   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 994               t->fib_index, t->adj_index, format_ip_adjacency,
 995               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 996   s = format (s, "\n%U%U",
 997               format_white_space, indent,
 998               format_ip_adjacency_packet_data,
 999               t->packet_data, sizeof (t->packet_data));
1000   return s;
1001 }
1002
1003 /* Common trace function for all ip6-forward next nodes. */
1004 #ifndef CLIB_MARCH_VARIANT
1005 void
1006 ip6_forward_next_trace (vlib_main_t * vm,
1007                         vlib_node_runtime_t * node,
1008                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1009 {
1010   u32 *from, n_left;
1011   ip6_main_t *im = &ip6_main;
1012
1013   n_left = frame->n_vectors;
1014   from = vlib_frame_vector_args (frame);
1015
1016   while (n_left >= 4)
1017     {
1018       u32 bi0, bi1;
1019       vlib_buffer_t *b0, *b1;
1020       ip6_forward_next_trace_t *t0, *t1;
1021
1022       /* Prefetch next iteration. */
1023       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1024       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1025
1026       bi0 = from[0];
1027       bi1 = from[1];
1028
1029       b0 = vlib_get_buffer (vm, bi0);
1030       b1 = vlib_get_buffer (vm, bi1);
1031
1032       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1033         {
1034           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1035           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1036           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1037           t0->fib_index =
1038             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1039              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1040             vec_elt (im->fib_index_by_sw_if_index,
1041                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1042
1043           clib_memcpy_fast (t0->packet_data,
1044                             vlib_buffer_get_current (b0),
1045                             sizeof (t0->packet_data));
1046         }
1047       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1048         {
1049           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1050           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1051           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1052           t1->fib_index =
1053             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1054              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1055             vec_elt (im->fib_index_by_sw_if_index,
1056                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1057
1058           clib_memcpy_fast (t1->packet_data,
1059                             vlib_buffer_get_current (b1),
1060                             sizeof (t1->packet_data));
1061         }
1062       from += 2;
1063       n_left -= 2;
1064     }
1065
1066   while (n_left >= 1)
1067     {
1068       u32 bi0;
1069       vlib_buffer_t *b0;
1070       ip6_forward_next_trace_t *t0;
1071
1072       bi0 = from[0];
1073
1074       b0 = vlib_get_buffer (vm, bi0);
1075
1076       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1077         {
1078           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1079           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1080           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1081           t0->fib_index =
1082             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1083              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1084             vec_elt (im->fib_index_by_sw_if_index,
1085                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1086
1087           clib_memcpy_fast (t0->packet_data,
1088                             vlib_buffer_get_current (b0),
1089                             sizeof (t0->packet_data));
1090         }
1091       from += 1;
1092       n_left -= 1;
1093     }
1094 }
1095
1096 /* Compute TCP/UDP/ICMP6 checksum in software. */
1097 u16
1098 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1099                                    ip6_header_t * ip0, int *bogus_lengthp)
1100 {
1101   ip_csum_t sum0 = 0;
1102   u16 payload_length, payload_length_host_byte_order;
1103   u32 i;
1104   u32 headers_size = sizeof (ip0[0]);
1105   u8 *data_this_buffer;
1106   u8 next_hdr = ip0->protocol;
1107
1108   ASSERT (bogus_lengthp);
1109   *bogus_lengthp = 0;
1110
1111   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1112   data_this_buffer = (u8 *) (ip0 + 1);
1113   payload_length = ip0->payload_length;
1114
1115   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1116    * or UDP-Ping packets */
1117   if (PREDICT_FALSE (next_hdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1118     {
1119       u32 skip_bytes;
1120       ip6_hop_by_hop_ext_t *ext_hdr =
1121         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1122
1123       /* validate really icmp6 next */
1124       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1125               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1126
1127       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1128       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1129
1130       payload_length_host_byte_order -= skip_bytes;
1131       headers_size += skip_bytes;
1132
1133       /* pseudo-header adjustments:
1134        *   exclude ext header bytes from payload length
1135        *   use payload IP proto rather than ext header IP proto
1136        */
1137       payload_length = clib_host_to_net_u16 (payload_length_host_byte_order);
1138       next_hdr = ext_hdr->next_hdr;
1139     }
1140
1141   /* Initialize checksum with ip pseudo-header. */
1142   sum0 = payload_length + clib_host_to_net_u16 (next_hdr);
1143
1144   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1145     {
1146       sum0 = ip_csum_with_carry
1147         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1148       sum0 = ip_csum_with_carry
1149         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1150     }
1151
1152   if (p0)
1153     return ip_calculate_l4_checksum (vm, p0, sum0,
1154                                      payload_length_host_byte_order,
1155                                      (u8 *) ip0, headers_size, NULL);
1156   else
1157     return ip_calculate_l4_checksum (vm, 0, sum0,
1158                                      payload_length_host_byte_order, NULL, 0,
1159                                      data_this_buffer);
1160 }
1161
1162 u32
1163 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1164 {
1165   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1166   udp_header_t *udp0;
1167   u16 sum16;
1168   int bogus_length;
1169
1170   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1171   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1172           || ip0->protocol == IP_PROTOCOL_ICMP6
1173           || ip0->protocol == IP_PROTOCOL_UDP
1174           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1175
1176   udp0 = (void *) (ip0 + 1);
1177   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1178     {
1179       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1180                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1181       return p0->flags;
1182     }
1183
1184   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1185
1186   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1187                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1188
1189   return p0->flags;
1190 }
1191 #endif
1192
1193 /**
1194  * @brief returns number of links on which src is reachable.
1195  */
1196 always_inline int
1197 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1198 {
1199   const load_balance_t *lb0;
1200   index_t lbi;
1201   u32 fib_index;
1202
1203   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1204                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1205   fib_index =
1206     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1207     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1208
1209   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1210   lb0 = load_balance_get (lbi);
1211
1212   return (fib_urpf_check_size (lb0->lb_urpf));
1213 }
1214
1215 always_inline u8
1216 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1217                            u32 * udp_offset0)
1218 {
1219   u32 proto0;
1220   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1221   if (proto0 != IP_PROTOCOL_UDP)
1222     {
1223       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1224       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1225     }
1226   return proto0;
1227 }
1228
1229 /* *INDENT-OFF* */
1230 VNET_FEATURE_ARC_INIT (ip6_local) =
1231 {
1232   .arc_name  = "ip6-local",
1233   .start_nodes = VNET_FEATURES ("ip6-local"),
1234 };
1235 /* *INDENT-ON* */
1236
1237 static_always_inline u8
1238 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1239 {
1240
1241   u16 payload_length_host_byte_order;
1242   u32 n_this_buffer, n_bytes_left;
1243   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1244   u32 headers_size = sizeof (ip0[0]);
1245   u8 *data_this_buffer;
1246
1247
1248   data_this_buffer = (u8 *) (ip0 + 1);
1249
1250   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1251
1252   /* validate really icmp6 next */
1253
1254   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1255       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1256     return 0;
1257
1258
1259   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1260   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1261
1262
1263   u32 n_ip_bytes_this_buffer =
1264     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1265   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1266     {
1267       n_this_buffer = p0->current_length > headers_size ?
1268         n_ip_bytes_this_buffer - headers_size : 0;
1269     }
1270
1271   n_bytes_left -= n_this_buffer;
1272   n_bytes_left -= p0->total_length_not_including_first_buffer;
1273
1274   if (n_bytes_left == 0)
1275     return 0;
1276   else
1277     return 1;
1278 }
1279
1280
1281 always_inline uword
1282 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1283                   vlib_frame_t * frame, int head_of_feature_arc)
1284 {
1285   ip6_main_t *im = &ip6_main;
1286   ip_lookup_main_t *lm = &im->lookup_main;
1287   u32 *from, n_left_from;
1288   vlib_node_runtime_t *error_node =
1289     vlib_node_get_runtime (vm, ip6_input_node.index);
1290   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1291   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1292   u16 nexts[VLIB_FRAME_SIZE], *next;
1293
1294   from = vlib_frame_vector_args (frame);
1295   n_left_from = frame->n_vectors;
1296
1297   if (node->flags & VLIB_NODE_FLAG_TRACE)
1298     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1299
1300   vlib_get_buffers (vm, from, bufs, n_left_from);
1301   b = bufs;
1302   next = nexts;
1303
1304   while (n_left_from > 2)
1305     {
1306       /* Prefetch next iteration. */
1307       if (n_left_from >= 6)
1308         {
1309           vlib_prefetch_buffer_header (b[4], STORE);
1310           vlib_prefetch_buffer_header (b[5], STORE);
1311           vlib_prefetch_buffer_data (b[2], LOAD);
1312           vlib_prefetch_buffer_data (b[3], LOAD);
1313         }
1314
1315       ip6_error_t error[2];
1316       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1317       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1318
1319       ip6_header_t *ip[2];
1320       ip[0] = vlib_buffer_get_current (b[0]);
1321       ip[1] = vlib_buffer_get_current (b[1]);
1322
1323       if (head_of_feature_arc)
1324         {
1325           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1326           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1327
1328           u8 type[2];
1329           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1330           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1331
1332           u32 flags[2];
1333           flags[0] = b[0]->flags;
1334           flags[1] = b[1]->flags;
1335
1336           vnet_buffer_oflags_t oflags[2];
1337           oflags[0] = vnet_buffer (b[0])->oflags;
1338           oflags[1] = vnet_buffer (b[1])->oflags;
1339
1340           u32 l4_offload[2];
1341           l4_offload[0] = (flags[0] & VNET_BUFFER_F_OFFLOAD) &&
1342                           (oflags[0] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1343                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1344           l4_offload[1] = (flags[1] & VNET_BUFFER_F_OFFLOAD) &&
1345                           (oflags[1] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1346                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1347
1348           u32 good_l4_csum[2];
1349           good_l4_csum[0] =
1350             (flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[0];
1351           good_l4_csum[1] =
1352             (flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[1];
1353
1354           u32 udp_offset[2] = { };
1355           u8 is_tcp_udp[2];
1356           is_tcp_udp[0] =
1357             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1358           is_tcp_udp[1] =
1359             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1360           i16 len_diff[2] = { 0 };
1361           if (PREDICT_TRUE (is_tcp_udp[0]))
1362             {
1363               udp_header_t *udp =
1364                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1365               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1366                 && udp->checksum == 0;
1367               /* optimistically verify UDP length. */
1368               u16 ip_len, udp_len;
1369               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1370               udp_len = clib_net_to_host_u16 (udp->length);
1371               len_diff[0] = ip_len - udp_len;
1372             }
1373           if (PREDICT_TRUE (is_tcp_udp[1]))
1374             {
1375               udp_header_t *udp =
1376                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1377               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1378                 && udp->checksum == 0;
1379               /* optimistically verify UDP length. */
1380               u16 ip_len, udp_len;
1381               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1382               udp_len = clib_net_to_host_u16 (udp->length);
1383               len_diff[1] = ip_len - udp_len;
1384             }
1385
1386           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1387           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1388
1389           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1390           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1391
1392           u8 need_csum[2];
1393           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1394             && !good_l4_csum[0]
1395             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1396           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1397             && !good_l4_csum[1]
1398             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1399           if (PREDICT_FALSE (need_csum[0]))
1400             {
1401               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1402               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1403               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1404             }
1405           else
1406             {
1407               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1408                 error[0] = IP6_ERROR_BAD_LENGTH;
1409             }
1410           if (PREDICT_FALSE (need_csum[1]))
1411             {
1412               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1413               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1414               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1415             }
1416           else
1417             {
1418               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1419                 error[1] = IP6_ERROR_BAD_LENGTH;
1420             }
1421
1422
1423           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1424
1425           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1426
1427           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1428                          IP6_ERROR_UDP_CHECKSUM,
1429                          "Wrong IP6 errors constants");
1430           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1431                          IP6_ERROR_ICMP_CHECKSUM,
1432                          "Wrong IP6 errors constants");
1433
1434           error[0] =
1435             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1436           error[1] =
1437             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1438
1439           /* Drop packets from unroutable hosts. */
1440           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1441           u8 unroutable[2];
1442           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1443             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1444             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1445           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1446             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1447             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1448           if (PREDICT_FALSE (unroutable[0]))
1449             {
1450               error[0] =
1451                 !ip6_urpf_loose_check (im, b[0],
1452                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1453                 : error[0];
1454             }
1455           if (PREDICT_FALSE (unroutable[1]))
1456             {
1457               error[1] =
1458                 !ip6_urpf_loose_check (im, b[1],
1459                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1460                 : error[1];
1461             }
1462
1463           vnet_buffer (b[0])->ip.fib_index =
1464             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1465             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1466             vnet_buffer (b[0])->ip.fib_index;
1467           vnet_buffer (b[1])->ip.fib_index =
1468             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1469             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1470             vnet_buffer (b[1])->ip.fib_index;
1471         }                       /* head_of_feature_arc */
1472
1473       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1474       next[0] =
1475         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1476       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1477       next[1] =
1478         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1479
1480       b[0]->error = error_node->errors[error[0]];
1481       b[1]->error = error_node->errors[error[1]];
1482
1483       if (head_of_feature_arc)
1484         {
1485           u8 ip6_unknown[2];
1486           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1487           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1488           if (PREDICT_TRUE (ip6_unknown[0]))
1489             {
1490               u32 next32 = next[0];
1491               vnet_feature_arc_start (arc_index,
1492                                       vnet_buffer (b[0])->sw_if_index
1493                                       [VLIB_RX], &next32, b[0]);
1494               next[0] = next32;
1495             }
1496           if (PREDICT_TRUE (ip6_unknown[1]))
1497             {
1498               u32 next32 = next[1];
1499               vnet_feature_arc_start (arc_index,
1500                                       vnet_buffer (b[1])->sw_if_index
1501                                       [VLIB_RX], &next32, b[1]);
1502               next[1] = next32;
1503             }
1504         }
1505
1506       /* next */
1507       b += 2;
1508       next += 2;
1509       n_left_from -= 2;
1510     }
1511
1512   while (n_left_from)
1513     {
1514       u8 error;
1515       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1516
1517       ip6_header_t *ip;
1518       ip = vlib_buffer_get_current (b[0]);
1519
1520       if (head_of_feature_arc)
1521         {
1522           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1523           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1524
1525           u32 flags = b[0]->flags;
1526
1527           vnet_buffer_oflags_t oflags = vnet_buffer (b[0])->oflags;
1528
1529           u32 l4_offload = (flags & VNET_BUFFER_F_OFFLOAD) &&
1530                            (oflags & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1531                                       VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1532
1533           u32 good_l4_csum =
1534             (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload;
1535           u32 udp_offset;
1536           i16 len_diff = 0;
1537           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1538           if (PREDICT_TRUE (is_tcp_udp))
1539             {
1540               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1541               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1542               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1543                 && udp->checksum == 0;
1544               /* optimistically verify UDP length. */
1545               u16 ip_len, udp_len;
1546               ip_len = clib_net_to_host_u16 (ip->payload_length);
1547               udp_len = clib_net_to_host_u16 (udp->length);
1548               len_diff = ip_len - udp_len;
1549             }
1550
1551           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1552           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1553
1554           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN &&
1555                          !good_l4_csum &&
1556                          !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1557           if (PREDICT_FALSE (need_csum))
1558             {
1559               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1560               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1561               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1562             }
1563           else
1564             {
1565               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1566                 error = IP6_ERROR_BAD_LENGTH;
1567             }
1568
1569
1570
1571           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1572           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1573                          IP6_ERROR_UDP_CHECKSUM,
1574                          "Wrong IP6 errors constants");
1575           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1576                          IP6_ERROR_ICMP_CHECKSUM,
1577                          "Wrong IP6 errors constants");
1578
1579           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1580
1581           /* Drop packets from unroutable hosts. */
1582           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1583           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1584             && type != IP_BUILTIN_PROTOCOL_ICMP
1585             && !ip6_address_is_link_local_unicast (&ip->src_address);
1586           if (PREDICT_FALSE (unroutable))
1587             {
1588               error =
1589                 !ip6_urpf_loose_check (im, b[0],
1590                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1591                 error;
1592             }
1593
1594           vnet_buffer (b[0])->ip.fib_index =
1595             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1596             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1597             vnet_buffer (b[0])->ip.fib_index;
1598         }                       /* head_of_feature_arc */
1599
1600       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1601       next[0] =
1602         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1603
1604       b[0]->error = error_node->errors[error];
1605
1606       if (head_of_feature_arc)
1607         {
1608           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1609             {
1610               u32 next32 = next[0];
1611               vnet_feature_arc_start (arc_index,
1612                                       vnet_buffer (b[0])->sw_if_index
1613                                       [VLIB_RX], &next32, b[0]);
1614               next[0] = next32;
1615             }
1616         }
1617
1618       /* next */
1619       b += 1;
1620       next += 1;
1621       n_left_from -= 1;
1622     }
1623
1624   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1625   return frame->n_vectors;
1626 }
1627
1628 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1629                                vlib_frame_t * frame)
1630 {
1631   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1632 }
1633
1634 /* *INDENT-OFF* */
1635 VLIB_REGISTER_NODE (ip6_local_node) =
1636 {
1637   .name = "ip6-local",
1638   .vector_size = sizeof (u32),
1639   .format_trace = format_ip6_forward_next_trace,
1640   .n_next_nodes = IP_LOCAL_N_NEXT,
1641   .next_nodes =
1642   {
1643     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1644     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1645     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1646     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1647     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1648   },
1649 };
1650 /* *INDENT-ON* */
1651
1652 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1653                                           vlib_node_runtime_t * node,
1654                                           vlib_frame_t * frame)
1655 {
1656   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1657 }
1658
1659 /* *INDENT-OFF* */
1660 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1661   .name = "ip6-local-end-of-arc",
1662   .vector_size = sizeof (u32),
1663
1664   .format_trace = format_ip6_forward_next_trace,
1665   .sibling_of = "ip6-local",
1666 };
1667
1668 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1669   .arc_name = "ip6-local",
1670   .node_name = "ip6-local-end-of-arc",
1671   .runs_before = 0, /* not before any other features */
1672 };
1673 /* *INDENT-ON* */
1674
1675 #ifdef CLIB_MARCH_VARIANT
1676 extern vlib_node_registration_t ip6_local_node;
1677 #else
1678 void
1679 ip6_register_protocol (u32 protocol, u32 node_index)
1680 {
1681   vlib_main_t *vm = vlib_get_main ();
1682   ip6_main_t *im = &ip6_main;
1683   ip_lookup_main_t *lm = &im->lookup_main;
1684
1685   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1686   lm->local_next_by_ip_protocol[protocol] =
1687     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1688 }
1689
1690 void
1691 ip6_unregister_protocol (u32 protocol)
1692 {
1693   ip6_main_t *im = &ip6_main;
1694   ip_lookup_main_t *lm = &im->lookup_main;
1695
1696   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1697   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1698 }
1699 #endif
1700
1701 typedef enum
1702 {
1703   IP6_REWRITE_NEXT_DROP,
1704   IP6_REWRITE_NEXT_ICMP_ERROR,
1705   IP6_REWRITE_NEXT_FRAGMENT,
1706   IP6_REWRITE_N_NEXT            /* Last */
1707 } ip6_rewrite_next_t;
1708
1709 /**
1710  * This bits of an IPv6 address to mask to construct a multicast
1711  * MAC address
1712  */
1713 #define IP6_MCAST_ADDR_MASK 0xffffffff
1714
1715 always_inline void
1716 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1717                u16 adj_packet_bytes, bool is_locally_generated,
1718                u32 * next, u8 is_midchain, u32 * error)
1719 {
1720   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1721     {
1722       if (is_locally_generated)
1723         {
1724           /* IP fragmentation */
1725           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1726                                    (is_midchain ?
1727                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1728                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1729           *next = IP6_REWRITE_NEXT_FRAGMENT;
1730           *error = IP6_ERROR_MTU_EXCEEDED;
1731         }
1732       else
1733         {
1734           *error = IP6_ERROR_MTU_EXCEEDED;
1735           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1736                                        adj_packet_bytes);
1737           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1738         }
1739     }
1740 }
1741
1742 always_inline uword
1743 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1744                              vlib_node_runtime_t * node,
1745                              vlib_frame_t * frame,
1746                              int do_counters, int is_midchain, int is_mcast)
1747 {
1748   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1749   u32 *from = vlib_frame_vector_args (frame);
1750   u32 n_left_from, n_left_to_next, *to_next, next_index;
1751   vlib_node_runtime_t *error_node =
1752     vlib_node_get_runtime (vm, ip6_input_node.index);
1753
1754   n_left_from = frame->n_vectors;
1755   next_index = node->cached_next_index;
1756   u32 thread_index = vm->thread_index;
1757
1758   while (n_left_from > 0)
1759     {
1760       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1761
1762       while (n_left_from >= 4 && n_left_to_next >= 2)
1763         {
1764           const ip_adjacency_t *adj0, *adj1;
1765           vlib_buffer_t *p0, *p1;
1766           ip6_header_t *ip0, *ip1;
1767           u32 pi0, rw_len0, next0, error0, adj_index0;
1768           u32 pi1, rw_len1, next1, error1, adj_index1;
1769           u32 tx_sw_if_index0, tx_sw_if_index1;
1770           bool is_locally_originated0, is_locally_originated1;
1771
1772           /* Prefetch next iteration. */
1773           {
1774             vlib_buffer_t *p2, *p3;
1775
1776             p2 = vlib_get_buffer (vm, from[2]);
1777             p3 = vlib_get_buffer (vm, from[3]);
1778
1779             vlib_prefetch_buffer_header (p2, LOAD);
1780             vlib_prefetch_buffer_header (p3, LOAD);
1781
1782             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1783             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1784
1785             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1786             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1787           }
1788
1789           pi0 = to_next[0] = from[0];
1790           pi1 = to_next[1] = from[1];
1791
1792           from += 2;
1793           n_left_from -= 2;
1794           to_next += 2;
1795           n_left_to_next -= 2;
1796
1797           p0 = vlib_get_buffer (vm, pi0);
1798           p1 = vlib_get_buffer (vm, pi1);
1799
1800           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1801           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1802
1803           ip0 = vlib_buffer_get_current (p0);
1804           ip1 = vlib_buffer_get_current (p1);
1805
1806           error0 = error1 = IP6_ERROR_NONE;
1807           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1808
1809           is_locally_originated0 =
1810             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1811           if (PREDICT_TRUE (!is_locally_originated0))
1812             {
1813               i32 hop_limit0 = ip0->hop_limit;
1814
1815               /* Input node should have reject packets with hop limit 0. */
1816               ASSERT (ip0->hop_limit > 0);
1817
1818               hop_limit0 -= 1;
1819
1820               ip0->hop_limit = hop_limit0;
1821
1822               /*
1823                * If the hop count drops below 1 when forwarding, generate
1824                * an ICMP response.
1825                */
1826               if (PREDICT_FALSE (hop_limit0 <= 0))
1827                 {
1828                   error0 = IP6_ERROR_TIME_EXPIRED;
1829                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1830                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1831                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1832                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1833                                                0);
1834                 }
1835             }
1836
1837           is_locally_originated1 =
1838             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1839           if (PREDICT_TRUE (!is_locally_originated1))
1840             {
1841               i32 hop_limit1 = ip1->hop_limit;
1842
1843               /* Input node should have reject packets with hop limit 0. */
1844               ASSERT (ip1->hop_limit > 0);
1845
1846               hop_limit1 -= 1;
1847
1848               ip1->hop_limit = hop_limit1;
1849
1850               /*
1851                * If the hop count drops below 1 when forwarding, generate
1852                * an ICMP response.
1853                */
1854               if (PREDICT_FALSE (hop_limit1 <= 0))
1855                 {
1856                   error1 = IP6_ERROR_TIME_EXPIRED;
1857                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1858                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1859                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1860                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1861                                                0);
1862                 }
1863             }
1864
1865           adj0 = adj_get (adj_index0);
1866           adj1 = adj_get (adj_index1);
1867
1868           rw_len0 = adj0[0].rewrite_header.data_bytes;
1869           rw_len1 = adj1[0].rewrite_header.data_bytes;
1870           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1871           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1872
1873           if (do_counters)
1874             {
1875               vlib_increment_combined_counter
1876                 (&adjacency_counters,
1877                  thread_index, adj_index0, 1,
1878                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1879               vlib_increment_combined_counter
1880                 (&adjacency_counters,
1881                  thread_index, adj_index1, 1,
1882                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1883             }
1884
1885           /* Check MTU of outgoing interface. */
1886           u16 ip0_len =
1887             clib_net_to_host_u16 (ip0->payload_length) +
1888             sizeof (ip6_header_t);
1889           u16 ip1_len =
1890             clib_net_to_host_u16 (ip1->payload_length) +
1891             sizeof (ip6_header_t);
1892           if (p0->flags & VNET_BUFFER_F_GSO)
1893             ip0_len = gso_mtu_sz (p0);
1894           if (p1->flags & VNET_BUFFER_F_GSO)
1895             ip1_len = gso_mtu_sz (p1);
1896
1897           ip6_mtu_check (p0, ip0_len,
1898                          adj0[0].rewrite_header.max_l3_packet_bytes,
1899                          is_locally_originated0, &next0, is_midchain,
1900                          &error0);
1901           ip6_mtu_check (p1, ip1_len,
1902                          adj1[0].rewrite_header.max_l3_packet_bytes,
1903                          is_locally_originated1, &next1, is_midchain,
1904                          &error1);
1905           /* Don't adjust the buffer for hop count issue; icmp-error node
1906            * wants to see the IP header */
1907           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1908             {
1909               p0->current_data -= rw_len0;
1910               p0->current_length += rw_len0;
1911               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1912               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1913               next0 = adj0[0].rewrite_header.next_index;
1914               if (PREDICT_FALSE
1915                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1916                 vnet_feature_arc_start_w_cfg_index
1917                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
1918                    adj0->ia_cfg_index);
1919             }
1920           else
1921             {
1922               p0->error = error_node->errors[error0];
1923             }
1924           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1925             {
1926               p1->current_data -= rw_len1;
1927               p1->current_length += rw_len1;
1928
1929               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1930               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1931               next1 = adj1[0].rewrite_header.next_index;
1932
1933               if (PREDICT_FALSE
1934                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1935                 vnet_feature_arc_start_w_cfg_index
1936                   (lm->output_feature_arc_index, tx_sw_if_index1, &next1, p1,
1937                    adj1->ia_cfg_index);
1938             }
1939           else
1940             {
1941               p1->error = error_node->errors[error1];
1942             }
1943
1944           if (is_midchain)
1945             {
1946               /* before we paint on the next header, update the L4
1947                * checksums if required, since there's no offload on a tunnel */
1948               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
1949                                           1 /* is_ip6 */ );
1950               vnet_calc_checksums_inline (vm, p1, 0 /* is_ip4 */ ,
1951                                           1 /* is_ip6 */ );
1952
1953               /* Guess we are only writing on ipv6 header. */
1954               vnet_rewrite_two_headers (adj0[0], adj1[0],
1955                                         ip0, ip1, sizeof (ip6_header_t));
1956             }
1957           else
1958             /* Guess we are only writing on simple Ethernet header. */
1959             vnet_rewrite_two_headers (adj0[0], adj1[0],
1960                                       ip0, ip1, sizeof (ethernet_header_t));
1961
1962           if (is_midchain)
1963             {
1964               if (adj0->sub_type.midchain.fixup_func)
1965                 adj0->sub_type.midchain.fixup_func
1966                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1967               if (adj1->sub_type.midchain.fixup_func)
1968                 adj1->sub_type.midchain.fixup_func
1969                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1970             }
1971           if (is_mcast)
1972             {
1973               /*
1974                * copy bytes from the IP address into the MAC rewrite
1975                */
1976               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1977                                           adj0->
1978                                           rewrite_header.dst_mcast_offset,
1979                                           &ip0->dst_address.as_u32[3],
1980                                           (u8 *) ip0);
1981               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1982                                           adj1->
1983                                           rewrite_header.dst_mcast_offset,
1984                                           &ip1->dst_address.as_u32[3],
1985                                           (u8 *) ip1);
1986             }
1987
1988           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1989                                            to_next, n_left_to_next,
1990                                            pi0, pi1, next0, next1);
1991         }
1992
1993       while (n_left_from > 0 && n_left_to_next > 0)
1994         {
1995           ip_adjacency_t *adj0;
1996           vlib_buffer_t *p0;
1997           ip6_header_t *ip0;
1998           u32 pi0, rw_len0;
1999           u32 adj_index0, next0, error0;
2000           u32 tx_sw_if_index0;
2001           bool is_locally_originated0;
2002
2003           pi0 = to_next[0] = from[0];
2004
2005           p0 = vlib_get_buffer (vm, pi0);
2006
2007           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2008
2009           adj0 = adj_get (adj_index0);
2010
2011           ip0 = vlib_buffer_get_current (p0);
2012
2013           error0 = IP6_ERROR_NONE;
2014           next0 = IP6_REWRITE_NEXT_DROP;
2015
2016           /* Check hop limit */
2017           is_locally_originated0 =
2018             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
2019           if (PREDICT_TRUE (!is_locally_originated0))
2020             {
2021               i32 hop_limit0 = ip0->hop_limit;
2022
2023               ASSERT (ip0->hop_limit > 0);
2024
2025               hop_limit0 -= 1;
2026
2027               ip0->hop_limit = hop_limit0;
2028
2029               if (PREDICT_FALSE (hop_limit0 <= 0))
2030                 {
2031                   /*
2032                    * If the hop count drops below 1 when forwarding, generate
2033                    * an ICMP response.
2034                    */
2035                   error0 = IP6_ERROR_TIME_EXPIRED;
2036                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
2037                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2038                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
2039                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
2040                                                0);
2041                 }
2042             }
2043
2044           if (is_midchain)
2045             {
2046               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
2047                                           1 /* is_ip6 */ );
2048
2049               /* Guess we are only writing on ip6 header. */
2050               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip6_header_t));
2051             }
2052           else
2053             /* Guess we are only writing on simple Ethernet header. */
2054             vnet_rewrite_one_header (adj0[0], ip0,
2055                                      sizeof (ethernet_header_t));
2056
2057           /* Update packet buffer attributes/set output interface. */
2058           rw_len0 = adj0[0].rewrite_header.data_bytes;
2059           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2060
2061           if (do_counters)
2062             {
2063               vlib_increment_combined_counter
2064                 (&adjacency_counters,
2065                  thread_index, adj_index0, 1,
2066                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2067             }
2068
2069           /* Check MTU of outgoing interface. */
2070           u16 ip0_len =
2071             clib_net_to_host_u16 (ip0->payload_length) +
2072             sizeof (ip6_header_t);
2073           if (p0->flags & VNET_BUFFER_F_GSO)
2074             ip0_len = gso_mtu_sz (p0);
2075
2076           ip6_mtu_check (p0, ip0_len,
2077                          adj0[0].rewrite_header.max_l3_packet_bytes,
2078                          is_locally_originated0, &next0, is_midchain,
2079                          &error0);
2080           /* Don't adjust the buffer for hop count issue; icmp-error node
2081            * wants to see the IP header */
2082           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2083             {
2084               p0->current_data -= rw_len0;
2085               p0->current_length += rw_len0;
2086
2087               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2088
2089               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2090               next0 = adj0[0].rewrite_header.next_index;
2091
2092               if (PREDICT_FALSE
2093                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2094                 vnet_feature_arc_start_w_cfg_index
2095                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
2096                    adj0->ia_cfg_index);
2097             }
2098           else
2099             {
2100               p0->error = error_node->errors[error0];
2101             }
2102
2103           if (is_midchain)
2104             {
2105               if (adj0->sub_type.midchain.fixup_func)
2106                 adj0->sub_type.midchain.fixup_func
2107                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2108             }
2109           if (is_mcast)
2110             {
2111               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2112                                           adj0->
2113                                           rewrite_header.dst_mcast_offset,
2114                                           &ip0->dst_address.as_u32[3],
2115                                           (u8 *) ip0);
2116             }
2117
2118           from += 1;
2119           n_left_from -= 1;
2120           to_next += 1;
2121           n_left_to_next -= 1;
2122
2123           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2124                                            to_next, n_left_to_next,
2125                                            pi0, next0);
2126         }
2127
2128       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2129     }
2130
2131   /* Need to do trace after rewrites to pick up new packet data. */
2132   if (node->flags & VLIB_NODE_FLAG_TRACE)
2133     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2134
2135   return frame->n_vectors;
2136 }
2137
2138 always_inline uword
2139 ip6_rewrite_inline (vlib_main_t * vm,
2140                     vlib_node_runtime_t * node,
2141                     vlib_frame_t * frame,
2142                     int do_counters, int is_midchain, int is_mcast)
2143 {
2144   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2145                                       is_midchain, is_mcast);
2146 }
2147
2148 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2149                                  vlib_node_runtime_t * node,
2150                                  vlib_frame_t * frame)
2151 {
2152   if (adj_are_counters_enabled ())
2153     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2154   else
2155     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2156 }
2157
2158 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2159                                        vlib_node_runtime_t * node,
2160                                        vlib_frame_t * frame)
2161 {
2162   if (adj_are_counters_enabled ())
2163     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2164   else
2165     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2166 }
2167
2168 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2169                                        vlib_node_runtime_t * node,
2170                                        vlib_frame_t * frame)
2171 {
2172   if (adj_are_counters_enabled ())
2173     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2174   else
2175     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2176 }
2177
2178 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2179                                   vlib_node_runtime_t * node,
2180                                   vlib_frame_t * frame)
2181 {
2182   if (adj_are_counters_enabled ())
2183     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2184   else
2185     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2186 }
2187
2188 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2189                                         vlib_node_runtime_t * node,
2190                                         vlib_frame_t * frame)
2191 {
2192   if (adj_are_counters_enabled ())
2193     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2194   else
2195     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2196 }
2197
2198 /* *INDENT-OFF* */
2199 VLIB_REGISTER_NODE (ip6_midchain_node) =
2200 {
2201   .name = "ip6-midchain",
2202   .vector_size = sizeof (u32),
2203   .format_trace = format_ip6_forward_next_trace,
2204   .sibling_of = "ip6-rewrite",
2205   };
2206
2207 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2208 {
2209   .name = "ip6-rewrite",
2210   .vector_size = sizeof (u32),
2211   .format_trace = format_ip6_rewrite_trace,
2212   .n_next_nodes = IP6_REWRITE_N_NEXT,
2213   .next_nodes =
2214   {
2215     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2216     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2217     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2218   },
2219 };
2220
2221 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2222   .name = "ip6-rewrite-bcast",
2223   .vector_size = sizeof (u32),
2224
2225   .format_trace = format_ip6_rewrite_trace,
2226   .sibling_of = "ip6-rewrite",
2227 };
2228
2229 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2230 {
2231   .name = "ip6-rewrite-mcast",
2232   .vector_size = sizeof (u32),
2233   .format_trace = format_ip6_rewrite_trace,
2234   .sibling_of = "ip6-rewrite",
2235 };
2236
2237
2238 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2239 {
2240   .name = "ip6-mcast-midchain",
2241   .vector_size = sizeof (u32),
2242   .format_trace = format_ip6_rewrite_trace,
2243   .sibling_of = "ip6-rewrite",
2244 };
2245
2246 /* *INDENT-ON* */
2247
2248 /*
2249  * Hop-by-Hop handling
2250  */
2251 #ifndef CLIB_MARCH_VARIANT
2252 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2253 #endif /* CLIB_MARCH_VARIANT */
2254
2255 #define foreach_ip6_hop_by_hop_error \
2256 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2257 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2258 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2259
2260 /* *INDENT-OFF* */
2261 typedef enum
2262 {
2263 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2264   foreach_ip6_hop_by_hop_error
2265 #undef _
2266   IP6_HOP_BY_HOP_N_ERROR,
2267 } ip6_hop_by_hop_error_t;
2268 /* *INDENT-ON* */
2269
2270 /*
2271  * Primary h-b-h handler trace support
2272  * We work pretty hard on the problem for obvious reasons
2273  */
2274 typedef struct
2275 {
2276   u32 next_index;
2277   u32 trace_len;
2278   u8 option_data[256];
2279 } ip6_hop_by_hop_trace_t;
2280
2281 extern vlib_node_registration_t ip6_hop_by_hop_node;
2282
2283 static char *ip6_hop_by_hop_error_strings[] = {
2284 #define _(sym,string) string,
2285   foreach_ip6_hop_by_hop_error
2286 #undef _
2287 };
2288
2289 #ifndef CLIB_MARCH_VARIANT
2290 u8 *
2291 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2292 {
2293   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2294   int total_len = va_arg (*args, int);
2295   ip6_hop_by_hop_option_t *opt0, *limit0;
2296   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2297   u8 type0;
2298   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2299               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2300
2301   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2302   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2303
2304   while (opt0 < limit0)
2305     {
2306       type0 = opt0->type;
2307       switch (type0)
2308         {
2309         case 0:         /* Pad, just stop */
2310           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2311           break;
2312
2313         default:
2314           if (hm->trace[type0])
2315             {
2316               s = (*hm->trace[type0]) (s, opt0);
2317             }
2318           else
2319             {
2320               s = format (s, "\n    unrecognized option %d length %d", type0,
2321                           opt0->length);
2322             }
2323           opt0 =
2324             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2325                                          sizeof (ip6_hop_by_hop_option_t));
2326           break;
2327         }
2328     }
2329   return s;
2330 }
2331 #endif
2332
2333 static u8 *
2334 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2335 {
2336   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2337   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2338   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2339   ip6_hop_by_hop_header_t *hbh0;
2340   ip6_hop_by_hop_option_t *opt0, *limit0;
2341   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2342
2343   u8 type0;
2344
2345   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2346
2347   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2348               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2349
2350   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2351   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2352
2353   while (opt0 < limit0)
2354     {
2355       type0 = opt0->type;
2356       switch (type0)
2357         {
2358         case 0:         /* Pad, just stop */
2359           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2360           break;
2361
2362         default:
2363           if (hm->trace[type0])
2364             {
2365               s = (*hm->trace[type0]) (s, opt0);
2366             }
2367           else
2368             {
2369               s = format (s, "\n    unrecognized option %d length %d", type0,
2370                           opt0->length);
2371             }
2372           opt0 =
2373             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2374                                          sizeof (ip6_hop_by_hop_option_t));
2375           break;
2376         }
2377     }
2378   return s;
2379 }
2380
2381 always_inline u8
2382 ip6_scan_hbh_options (vlib_buffer_t * b0,
2383                       ip6_header_t * ip0,
2384                       ip6_hop_by_hop_header_t * hbh0,
2385                       ip6_hop_by_hop_option_t * opt0,
2386                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2387 {
2388   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2389   u8 type0;
2390   u8 error0 = 0;
2391
2392   while (opt0 < limit0)
2393     {
2394       type0 = opt0->type;
2395       switch (type0)
2396         {
2397         case 0:         /* Pad1 */
2398           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2399           continue;
2400         case 1:         /* PadN */
2401           break;
2402         default:
2403           if (hm->options[type0])
2404             {
2405               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2406                 {
2407                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2408                   return (error0);
2409                 }
2410             }
2411           else
2412             {
2413               /* Unrecognized mandatory option, check the two high order bits */
2414               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2415                 {
2416                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2417                   break;
2418                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2419                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2420                   *next0 = IP_LOOKUP_NEXT_DROP;
2421                   break;
2422                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2423                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2424                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2425                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2426                                                ICMP6_parameter_problem_unrecognized_option,
2427                                                (u8 *) opt0 - (u8 *) ip0);
2428                   break;
2429                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2430                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2431                   if (!ip6_address_is_multicast (&ip0->dst_address))
2432                     {
2433                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2434                       icmp6_error_set_vnet_buffer (b0,
2435                                                    ICMP6_parameter_problem,
2436                                                    ICMP6_parameter_problem_unrecognized_option,
2437                                                    (u8 *) opt0 - (u8 *) ip0);
2438                     }
2439                   else
2440                     {
2441                       *next0 = IP_LOOKUP_NEXT_DROP;
2442                     }
2443                   break;
2444                 }
2445               return (error0);
2446             }
2447         }
2448       opt0 =
2449         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2450                                      sizeof (ip6_hop_by_hop_option_t));
2451     }
2452   return (error0);
2453 }
2454
2455 /*
2456  * Process the Hop-by-Hop Options header
2457  */
2458 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2459                                     vlib_node_runtime_t * node,
2460                                     vlib_frame_t * frame)
2461 {
2462   vlib_node_runtime_t *error_node =
2463     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2464   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2465   u32 n_left_from, *from, *to_next;
2466   ip_lookup_next_t next_index;
2467
2468   from = vlib_frame_vector_args (frame);
2469   n_left_from = frame->n_vectors;
2470   next_index = node->cached_next_index;
2471
2472   while (n_left_from > 0)
2473     {
2474       u32 n_left_to_next;
2475
2476       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2477
2478       while (n_left_from >= 4 && n_left_to_next >= 2)
2479         {
2480           u32 bi0, bi1;
2481           vlib_buffer_t *b0, *b1;
2482           u32 next0, next1;
2483           ip6_header_t *ip0, *ip1;
2484           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2485           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2486           u8 error0 = 0, error1 = 0;
2487
2488           /* Prefetch next iteration. */
2489           {
2490             vlib_buffer_t *p2, *p3;
2491
2492             p2 = vlib_get_buffer (vm, from[2]);
2493             p3 = vlib_get_buffer (vm, from[3]);
2494
2495             vlib_prefetch_buffer_header (p2, LOAD);
2496             vlib_prefetch_buffer_header (p3, LOAD);
2497
2498             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2499             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2500           }
2501
2502           /* Speculatively enqueue b0, b1 to the current next frame */
2503           to_next[0] = bi0 = from[0];
2504           to_next[1] = bi1 = from[1];
2505           from += 2;
2506           to_next += 2;
2507           n_left_from -= 2;
2508           n_left_to_next -= 2;
2509
2510           b0 = vlib_get_buffer (vm, bi0);
2511           b1 = vlib_get_buffer (vm, bi1);
2512
2513           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2514           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2515           ip_adjacency_t *adj0 = adj_get (adj_index0);
2516           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2517           ip_adjacency_t *adj1 = adj_get (adj_index1);
2518
2519           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2520           next0 = adj0->lookup_next_index;
2521           next1 = adj1->lookup_next_index;
2522
2523           ip0 = vlib_buffer_get_current (b0);
2524           ip1 = vlib_buffer_get_current (b1);
2525           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2526           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2527           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2528           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2529           limit0 =
2530             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2531                                          ((hbh0->length + 1) << 3));
2532           limit1 =
2533             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2534                                          ((hbh1->length + 1) << 3));
2535
2536           /*
2537            * Basic validity checks
2538            */
2539           if ((hbh0->length + 1) << 3 >
2540               clib_net_to_host_u16 (ip0->payload_length))
2541             {
2542               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2543               next0 = IP_LOOKUP_NEXT_DROP;
2544               goto outdual;
2545             }
2546           /* Scan the set of h-b-h options, process ones that we understand */
2547           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2548
2549           if ((hbh1->length + 1) << 3 >
2550               clib_net_to_host_u16 (ip1->payload_length))
2551             {
2552               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2553               next1 = IP_LOOKUP_NEXT_DROP;
2554               goto outdual;
2555             }
2556           /* Scan the set of h-b-h options, process ones that we understand */
2557           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2558
2559         outdual:
2560           /* Has the classifier flagged this buffer for special treatment? */
2561           if (PREDICT_FALSE
2562               ((error0 == 0)
2563                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2564             next0 = hm->next_override;
2565
2566           /* Has the classifier flagged this buffer for special treatment? */
2567           if (PREDICT_FALSE
2568               ((error1 == 0)
2569                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2570             next1 = hm->next_override;
2571
2572           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2573             {
2574               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2575                 {
2576                   ip6_hop_by_hop_trace_t *t =
2577                     vlib_add_trace (vm, node, b0, sizeof (*t));
2578                   u32 trace_len = (hbh0->length + 1) << 3;
2579                   t->next_index = next0;
2580                   /* Capture the h-b-h option verbatim */
2581                   trace_len =
2582                     trace_len <
2583                     ARRAY_LEN (t->option_data) ? trace_len :
2584                     ARRAY_LEN (t->option_data);
2585                   t->trace_len = trace_len;
2586                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2587                 }
2588               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2589                 {
2590                   ip6_hop_by_hop_trace_t *t =
2591                     vlib_add_trace (vm, node, b1, sizeof (*t));
2592                   u32 trace_len = (hbh1->length + 1) << 3;
2593                   t->next_index = next1;
2594                   /* Capture the h-b-h option verbatim */
2595                   trace_len =
2596                     trace_len <
2597                     ARRAY_LEN (t->option_data) ? trace_len :
2598                     ARRAY_LEN (t->option_data);
2599                   t->trace_len = trace_len;
2600                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2601                 }
2602
2603             }
2604
2605           b0->error = error_node->errors[error0];
2606           b1->error = error_node->errors[error1];
2607
2608           /* verify speculative enqueue, maybe switch current next frame */
2609           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2610                                            n_left_to_next, bi0, bi1, next0,
2611                                            next1);
2612         }
2613
2614       while (n_left_from > 0 && n_left_to_next > 0)
2615         {
2616           u32 bi0;
2617           vlib_buffer_t *b0;
2618           u32 next0;
2619           ip6_header_t *ip0;
2620           ip6_hop_by_hop_header_t *hbh0;
2621           ip6_hop_by_hop_option_t *opt0, *limit0;
2622           u8 error0 = 0;
2623
2624           /* Speculatively enqueue b0 to the current next frame */
2625           bi0 = from[0];
2626           to_next[0] = bi0;
2627           from += 1;
2628           to_next += 1;
2629           n_left_from -= 1;
2630           n_left_to_next -= 1;
2631
2632           b0 = vlib_get_buffer (vm, bi0);
2633           /*
2634            * Default use the next_index from the adjacency.
2635            * A HBH option rarely redirects to a different node
2636            */
2637           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2638           ip_adjacency_t *adj0 = adj_get (adj_index0);
2639           next0 = adj0->lookup_next_index;
2640
2641           ip0 = vlib_buffer_get_current (b0);
2642           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2643           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2644           limit0 =
2645             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2646                                          ((hbh0->length + 1) << 3));
2647
2648           /*
2649            * Basic validity checks
2650            */
2651           if ((hbh0->length + 1) << 3 >
2652               clib_net_to_host_u16 (ip0->payload_length))
2653             {
2654               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2655               next0 = IP_LOOKUP_NEXT_DROP;
2656               goto out0;
2657             }
2658
2659           /* Scan the set of h-b-h options, process ones that we understand */
2660           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2661
2662         out0:
2663           /* Has the classifier flagged this buffer for special treatment? */
2664           if (PREDICT_FALSE
2665               ((error0 == 0)
2666                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2667             next0 = hm->next_override;
2668
2669           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2670             {
2671               ip6_hop_by_hop_trace_t *t =
2672                 vlib_add_trace (vm, node, b0, sizeof (*t));
2673               u32 trace_len = (hbh0->length + 1) << 3;
2674               t->next_index = next0;
2675               /* Capture the h-b-h option verbatim */
2676               trace_len =
2677                 trace_len <
2678                 ARRAY_LEN (t->option_data) ? trace_len :
2679                 ARRAY_LEN (t->option_data);
2680               t->trace_len = trace_len;
2681               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2682             }
2683
2684           b0->error = error_node->errors[error0];
2685
2686           /* verify speculative enqueue, maybe switch current next frame */
2687           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2688                                            n_left_to_next, bi0, next0);
2689         }
2690       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2691     }
2692   return frame->n_vectors;
2693 }
2694
2695 /* *INDENT-OFF* */
2696 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2697 {
2698   .name = "ip6-hop-by-hop",
2699   .sibling_of = "ip6-lookup",
2700   .vector_size = sizeof (u32),
2701   .format_trace = format_ip6_hop_by_hop_trace,
2702   .type = VLIB_NODE_TYPE_INTERNAL,
2703   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2704   .error_strings = ip6_hop_by_hop_error_strings,
2705   .n_next_nodes = 0,
2706 };
2707 /* *INDENT-ON* */
2708
2709 static clib_error_t *
2710 ip6_hop_by_hop_init (vlib_main_t * vm)
2711 {
2712   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2713   clib_memset (hm->options, 0, sizeof (hm->options));
2714   clib_memset (hm->trace, 0, sizeof (hm->trace));
2715   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2716   return (0);
2717 }
2718
2719 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2720
2721 #ifndef CLIB_MARCH_VARIANT
2722 void
2723 ip6_hbh_set_next_override (uword next)
2724 {
2725   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2726
2727   hm->next_override = next;
2728 }
2729
2730 int
2731 ip6_hbh_register_option (u8 option,
2732                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2733                                       ip6_hop_by_hop_option_t * opt),
2734                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2735 {
2736   ip6_main_t *im = &ip6_main;
2737   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2738
2739   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2740
2741   /* Already registered */
2742   if (hm->options[option])
2743     return (-1);
2744
2745   hm->options[option] = options;
2746   hm->trace[option] = trace;
2747
2748   /* Set global variable */
2749   im->hbh_enabled = 1;
2750
2751   return (0);
2752 }
2753
2754 int
2755 ip6_hbh_unregister_option (u8 option)
2756 {
2757   ip6_main_t *im = &ip6_main;
2758   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2759
2760   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2761
2762   /* Not registered */
2763   if (!hm->options[option])
2764     return (-1);
2765
2766   hm->options[option] = NULL;
2767   hm->trace[option] = NULL;
2768
2769   /* Disable global knob if this was the last option configured */
2770   int i;
2771   bool found = false;
2772   for (i = 0; i < 256; i++)
2773     {
2774       if (hm->options[option])
2775         {
2776           found = true;
2777           break;
2778         }
2779     }
2780   if (!found)
2781     im->hbh_enabled = 0;
2782
2783   return (0);
2784 }
2785
2786 /* Global IP6 main. */
2787 ip6_main_t ip6_main;
2788 #endif
2789
2790 static clib_error_t *
2791 ip6_lookup_init (vlib_main_t * vm)
2792 {
2793   ip6_main_t *im = &ip6_main;
2794   clib_error_t *error;
2795   uword i;
2796
2797   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2798     return error;
2799
2800   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2801     {
2802       u32 j, i0, i1;
2803
2804       i0 = i / 32;
2805       i1 = i % 32;
2806
2807       for (j = 0; j < i0; j++)
2808         im->fib_masks[i].as_u32[j] = ~0;
2809
2810       if (i1)
2811         im->fib_masks[i].as_u32[i0] =
2812           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2813     }
2814
2815   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2816
2817   /* Create FIB with index 0 and table id of 0. */
2818   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2819                                      FIB_SOURCE_DEFAULT_ROUTE);
2820   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2821                                       MFIB_SOURCE_DEFAULT_ROUTE);
2822
2823   {
2824     pg_node_t *pn;
2825     pn = pg_get_node (ip6_lookup_node.index);
2826     pn->unformat_edit = unformat_pg_ip6_header;
2827   }
2828
2829   /* Unless explicitly configured, don't process HBH options */
2830   im->hbh_enabled = 0;
2831
2832   return error;
2833 }
2834
2835 VLIB_INIT_FUNCTION (ip6_lookup_init);
2836
2837 static clib_error_t *
2838 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2839                               unformat_input_t * input,
2840                               vlib_cli_command_t * cmd)
2841 {
2842   int matched = 0;
2843   u32 table_id = 0;
2844   u32 flow_hash_config = 0;
2845   int rv;
2846
2847   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2848     {
2849       if (unformat (input, "table %d", &table_id))
2850         matched = 1;
2851 #define _(a, b, v)                                                            \
2852   else if (unformat (input, #a))                                              \
2853   {                                                                           \
2854     flow_hash_config |= v;                                                    \
2855     matched = 1;                                                              \
2856   }
2857       foreach_flow_hash_bit
2858 #undef _
2859         else
2860         break;
2861     }
2862
2863   if (matched == 0)
2864     return clib_error_return (0, "unknown input `%U'",
2865                               format_unformat_error, input);
2866
2867   rv = ip_flow_hash_set (AF_IP6, table_id, flow_hash_config);
2868   switch (rv)
2869     {
2870     case 0:
2871       break;
2872
2873     case -1:
2874       return clib_error_return (0, "no such FIB table %d", table_id);
2875
2876     default:
2877       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2878       break;
2879     }
2880
2881   return 0;
2882 }
2883
2884 /*?
2885  * Configure the set of IPv6 fields used by the flow hash.
2886  *
2887  * @cliexpar
2888  * @parblock
2889  * Example of how to set the flow hash on a given table:
2890  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2891  *
2892  * Example of display the configured flow hash:
2893  * @cliexstart{show ip6 fib}
2894  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2895  * @::/0
2896  *   unicast-ip6-chain
2897  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2898  *     [0] [@0]: dpo-drop ip6
2899  * fe80::/10
2900  *   unicast-ip6-chain
2901  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2902  *     [0] [@2]: dpo-receive
2903  * ff02::1/128
2904  *   unicast-ip6-chain
2905  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2906  *     [0] [@2]: dpo-receive
2907  * ff02::2/128
2908  *   unicast-ip6-chain
2909  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2910  *     [0] [@2]: dpo-receive
2911  * ff02::16/128
2912  *   unicast-ip6-chain
2913  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2914  *     [0] [@2]: dpo-receive
2915  * ff02::1:ff00:0/104
2916  *   unicast-ip6-chain
2917  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2918  *     [0] [@2]: dpo-receive
2919  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2920  * @::/0
2921  *   unicast-ip6-chain
2922  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2923  *     [0] [@0]: dpo-drop ip6
2924  * @::a:1:1:0:4/126
2925  *   unicast-ip6-chain
2926  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2927  *     [0] [@4]: ipv6-glean: af_packet0
2928  * @::a:1:1:0:7/128
2929  *   unicast-ip6-chain
2930  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2931  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2932  * fe80::/10
2933  *   unicast-ip6-chain
2934  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2935  *     [0] [@2]: dpo-receive
2936  * fe80::fe:3eff:fe3e:9222/128
2937  *   unicast-ip6-chain
2938  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2939  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2940  * ff02::1/128
2941  *   unicast-ip6-chain
2942  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2943  *     [0] [@2]: dpo-receive
2944  * ff02::2/128
2945  *   unicast-ip6-chain
2946  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2947  *     [0] [@2]: dpo-receive
2948  * ff02::16/128
2949  *   unicast-ip6-chain
2950  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2951  *     [0] [@2]: dpo-receive
2952  * ff02::1:ff00:0/104
2953  *   unicast-ip6-chain
2954  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2955  *     [0] [@2]: dpo-receive
2956  * @cliexend
2957  * @endparblock
2958 ?*/
2959 /* *INDENT-OFF* */
2960 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
2961   .path = "set ip6 flow-hash",
2962   .short_help = "set ip6 flow-hash table <table-id> [src] [dst] [sport] "
2963                 "[dport] [proto] [reverse] [flowlabel]",
2964   .function = set_ip6_flow_hash_command_fn,
2965 };
2966 /* *INDENT-ON* */
2967
2968 static clib_error_t *
2969 show_ip6_local_command_fn (vlib_main_t * vm,
2970                            unformat_input_t * input, vlib_cli_command_t * cmd)
2971 {
2972   ip6_main_t *im = &ip6_main;
2973   ip_lookup_main_t *lm = &im->lookup_main;
2974   int i;
2975
2976   vlib_cli_output (vm, "Protocols handled by ip6_local");
2977   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2978     {
2979       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2980         {
2981
2982           u32 node_index = vlib_get_node (vm,
2983                                           ip6_local_node.index)->
2984             next_nodes[lm->local_next_by_ip_protocol[i]];
2985           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2986                            node_index);
2987         }
2988     }
2989   return 0;
2990 }
2991
2992
2993
2994 /*?
2995  * Display the set of protocols handled by the local IPv6 stack.
2996  *
2997  * @cliexpar
2998  * Example of how to display local protocol table:
2999  * @cliexstart{show ip6 local}
3000  * Protocols handled by ip6_local
3001  * 17
3002  * 43
3003  * 58
3004  * 115
3005  * @cliexend
3006 ?*/
3007 /* *INDENT-OFF* */
3008 VLIB_CLI_COMMAND (show_ip6_local, static) =
3009 {
3010   .path = "show ip6 local",
3011   .function = show_ip6_local_command_fn,
3012   .short_help = "show ip6 local",
3013 };
3014 /* *INDENT-ON* */
3015
3016 #ifndef CLIB_MARCH_VARIANT
3017 int
3018 vnet_set_ip6_classify_intfc (vlib_main_t *vm, u32 sw_if_index, u32 table_index)
3019 {
3020   vnet_main_t *vnm = vnet_get_main ();
3021   vnet_interface_main_t *im = &vnm->interface_main;
3022   ip6_main_t *ipm = &ip6_main;
3023   ip_lookup_main_t *lm = &ipm->lookup_main;
3024   vnet_classify_main_t *cm = &vnet_classify_main;
3025   ip6_address_t *if_addr;
3026
3027   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3028     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3029
3030   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3031     return VNET_API_ERROR_NO_SUCH_ENTRY;
3032
3033   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3034   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3035
3036   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3037
3038   if (NULL != if_addr)
3039     {
3040       fib_prefix_t pfx = {
3041         .fp_len = 128,
3042         .fp_proto = FIB_PROTOCOL_IP6,
3043         .fp_addr.ip6 = *if_addr,
3044       };
3045       u32 fib_index;
3046
3047       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3048                                                        sw_if_index);
3049       if (table_index != (u32) ~ 0)
3050         {
3051           dpo_id_t dpo = DPO_INVALID;
3052           dpo_set (&dpo,
3053                    DPO_CLASSIFY,
3054                    DPO_PROTO_IP6,
3055                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3056           fib_table_entry_special_dpo_add (fib_index,
3057                                            &pfx,
3058                                            FIB_SOURCE_CLASSIFY,
3059                                            FIB_ENTRY_FLAG_NONE, &dpo);
3060           dpo_reset (&dpo);
3061         }
3062       else
3063         {
3064           fib_table_entry_special_remove (fib_index,
3065                                           &pfx, FIB_SOURCE_CLASSIFY);
3066         }
3067     }
3068
3069   return 0;
3070 }
3071 #endif
3072
3073 static clib_error_t *
3074 set_ip6_classify_command_fn (vlib_main_t * vm,
3075                              unformat_input_t * input,
3076                              vlib_cli_command_t * cmd)
3077 {
3078   u32 table_index = ~0;
3079   int table_index_set = 0;
3080   u32 sw_if_index = ~0;
3081   int rv;
3082
3083   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3084     {
3085       if (unformat (input, "table-index %d", &table_index))
3086         table_index_set = 1;
3087       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3088                          vnet_get_main (), &sw_if_index))
3089         ;
3090       else
3091         break;
3092     }
3093
3094   if (table_index_set == 0)
3095     return clib_error_return (0, "classify table-index must be specified");
3096
3097   if (sw_if_index == ~0)
3098     return clib_error_return (0, "interface / subif must be specified");
3099
3100   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3101
3102   switch (rv)
3103     {
3104     case 0:
3105       break;
3106
3107     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3108       return clib_error_return (0, "No such interface");
3109
3110     case VNET_API_ERROR_NO_SUCH_ENTRY:
3111       return clib_error_return (0, "No such classifier table");
3112     }
3113   return 0;
3114 }
3115
3116 /*?
3117  * Assign a classification table to an interface. The classification
3118  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3119  * commands. Once the table is create, use this command to filter packets
3120  * on an interface.
3121  *
3122  * @cliexpar
3123  * Example of how to assign a classification table to an interface:
3124  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3125 ?*/
3126 /* *INDENT-OFF* */
3127 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3128 {
3129   .path = "set ip6 classify",
3130   .short_help =
3131   "set ip6 classify intfc <interface> table-index <classify-idx>",
3132   .function = set_ip6_classify_command_fn,
3133 };
3134 /* *INDENT-ON* */
3135
3136 /*
3137  * fd.io coding-style-patch-verification: ON
3138  *
3139  * Local Variables:
3140  * eval: (c-set-style "gnu")
3141  * End:
3142  */