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
 243   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 244
 245   /*
 246    * enable/disable only on the 1<->0 transition
 247    */
 248   if (is_enable)
 249     {
 250       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 251         return;
 252     }
 253   else
 254     {
 255       /* The ref count is 0 when an address is removed from an interface that has
 256        * no address - this is not a ciritical error */
 257       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 258           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 259         return;
 260     }
 261
 262   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 263                                !is_enable, 0, 0);
 264
 265   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 266                                sw_if_index, !is_enable, 0, 0);
 267 }
 268
 269 /* get first interface address */
 270 ip6_address_t *
 271 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 272 {
 273   ip_lookup_main_t *lm = &im->lookup_main;
 274   ip_interface_address_t *ia = 0;
 275   ip6_address_t *result = 0;
 276
 277   /* *INDENT-OFF* */
 278   foreach_ip_interface_address (lm, ia, sw_if_index,
 279                                 1 /* honor unnumbered */,
 280   ({
 281     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 282     result = a;
 283     break;
 284   }));
 285   /* *INDENT-ON* */
 286   return result;
 287 }
 288
 289 clib_error_t *
 290 ip6_add_del_interface_address (vlib_main_t * vm,
 291                                u32 sw_if_index,
 292                                ip6_address_t * address,
 293                                u32 address_length, u32 is_del)
 294 {
 295   vnet_main_t *vnm = vnet_get_main ();
 296   ip6_main_t *im = &ip6_main;
 297   ip_lookup_main_t *lm = &im->lookup_main;
 298   clib_error_t *error;
 299   u32 if_address_index;
 300   ip6_address_fib_t ip6_af, *addr_fib = 0;
 301   const ip6_address_t *ll_addr;
 302
 303   /* local0 interface doesn't support IP addressing */
 304   if (sw_if_index == 0)
 305     {
 306       return
 307         clib_error_create ("local0 interface doesn't support IP addressing");
 308     }
 309
 310   if (ip6_address_is_link_local_unicast (address))
 311     {
 312       if (address_length != 128)
 313         {
 314           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 315           return
 316             clib_error_create
 317             ("prefix length of link-local address must be 128");
 318         }
 319       if (!is_del)
 320         {
 321           int rv;
 322
 323           rv = ip6_set_link_local_address (sw_if_index, address);
 324
 325           if (rv)
 326             {
 327               vnm->api_errno = rv;
 328               return clib_error_create ("address not assignable");
 329             }
 330         }
 331       else
 332         {
 333           ll_addr = ip6_get_link_local_address (sw_if_index);
 334           if (ip6_address_is_equal (ll_addr, address))
 335             {
 336               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 337               return clib_error_create ("address not deletable");
 338             }
 339           else
 340             {
 341               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 342               return clib_error_create ("address not found");
 343             }
 344         }
 345     }
 346
 347   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 348   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 349
 350   ip6_addr_fib_init (&ip6_af, address,
 351                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 352   vec_add1 (addr_fib, ip6_af);
 353
 354   /* *INDENT-OFF* */
 355   if (!is_del)
 356     {
 357       /* When adding an address check that it does not conflict
 358          with an existing address on any interface in this table. */
 359       ip_interface_address_t *ia;
 360       vnet_sw_interface_t *sif;
 361
 362       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 363       ({
 364           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 365               im->fib_index_by_sw_if_index[sif->sw_if_index])
 366             {
 367               foreach_ip_interface_address
 368                 (&im->lookup_main, ia, sif->sw_if_index,
 369                  0 /* honor unnumbered */ ,
 370                  ({
 371                    ip6_address_t * x =
 372                      ip_interface_address_get_address
 373                      (&im->lookup_main, ia);
 374                    if (ip6_destination_matches_route
 375                        (im, address, x, ia->address_length) ||
 376                        ip6_destination_matches_route (im,
 377                                                       x,
 378                                                       address,
 379                                                       address_length))
 380                      {
 381                        /* an intf may have >1 addr from the same prefix */
 382                        if ((sw_if_index == sif->sw_if_index) &&
 383                            (ia->address_length == address_length) &&
 384                            !ip6_address_is_equal (x, address))
 385                          continue;
 386
 387                        /* error if the length or intf was different */
 388                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 389                        return
 390                          clib_error_create
 391                          ("failed to add %U which conflicts with %U for interface %U",
 392                           format_ip6_address_and_length, address,
 393                           address_length,
 394                           format_ip6_address_and_length, x,
 395                           ia->address_length,
 396                           format_vnet_sw_if_index_name, vnm,
 397                           sif->sw_if_index);
 398                      }
 399                  }));
 400             }
 401       }));
 402     }
 403   /* *INDENT-ON* */
 404
 405   {
 406     uword elts_before = pool_elts (lm->if_address_pool);
 407
 408     error = ip_interface_address_add_del
 409       (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 410     if (error)
 411       goto done;
 412
 413     /* Pool did not grow: add duplicate address. */
 414     if (elts_before == pool_elts (lm->if_address_pool))
 415       goto done;
 416   }
 417
 418   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 419   if (!is_del)
 420     ip6_link_enable (sw_if_index);
 421
 422   /* intf addr routes are added/deleted on admin up/down */
 423   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 424     {
 425       if (is_del)
 426         ip6_del_interface_routes (sw_if_index,
 427                                   im, ip6_af.fib_index, address,
 428                                   address_length);
 429       else
 430         ip6_add_interface_routes (vnm, sw_if_index,
 431                                   im, ip6_af.fib_index,
 432                                   pool_elt_at_index (lm->if_address_pool,
 433                                                      if_address_index));
 434     }
 435   {
 436     ip6_add_del_interface_address_callback_t *cb;
 437     vec_foreach (cb, im->add_del_interface_address_callbacks)
 438       cb->function (im, cb->function_opaque, sw_if_index,
 439                     address, address_length, if_address_index, is_del);
 440   }
 441   if (is_del)
 442     ip6_link_disable (sw_if_index);
 443
 444 done:
 445   vec_free (addr_fib);
 446   return error;
 447 }
 448
 449 #endif
 450
 451 static clib_error_t *
 452 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 453 {
 454   ip6_main_t *im = &ip6_main;
 455   ip_interface_address_t *ia;
 456   ip6_address_t *a;
 457   u32 is_admin_up, fib_index;
 458
 459   /* Fill in lookup tables with default table (0). */
 460   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 461
 462   vec_validate_init_empty (im->
 463                            lookup_main.if_address_pool_index_by_sw_if_index,
 464                            sw_if_index, ~0);
 465
 466   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 467
 468   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 469
 470   /* *INDENT-OFF* */
 471   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 472                                 0 /* honor unnumbered */,
 473   ({
 474     a = ip_interface_address_get_address (&im->lookup_main, ia);
 475     if (is_admin_up)
 476       ip6_add_interface_routes (vnm, sw_if_index,
 477                                 im, fib_index,
 478                                 ia);
 479     else
 480       ip6_del_interface_routes (sw_if_index, im, fib_index,
 481                                 a, ia->address_length);
 482   }));
 483   /* *INDENT-ON* */
 484
 485   return 0;
 486 }
 487
 488 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 489
 490 /* Built-in ip6 unicast rx feature path definition */
 491 /* *INDENT-OFF* */
 492 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 493 {
 494   .arc_name  = "ip6-unicast",
 495   .start_nodes = VNET_FEATURES ("ip6-input"),
 496   .last_in_arc = "ip6-lookup",
 497   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 498 };
 499
 500 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 501 {
 502   .arc_name = "ip6-unicast",
 503   .node_name = "ip6-flow-classify",
 504   .runs_before = VNET_FEATURES ("ip6-inacl"),
 505 };
 506
 507 VNET_FEATURE_INIT (ip6_inacl, static) =
 508 {
 509   .arc_name = "ip6-unicast",
 510   .node_name = "ip6-inacl",
 511   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 512 };
 513
 514 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 515 {
 516   .arc_name = "ip6-unicast",
 517   .node_name = "ip6-policer-classify",
 518   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 519 };
 520
 521 VNET_FEATURE_INIT (ip6_ipsec, static) =
 522 {
 523   .arc_name = "ip6-unicast",
 524   .node_name = "ipsec6-input-feature",
 525   .runs_before = VNET_FEATURES ("l2tp-decap"),
 526 };
 527
 528 VNET_FEATURE_INIT (ip6_l2tp, static) =
 529 {
 530   .arc_name = "ip6-unicast",
 531   .node_name = "l2tp-decap",
 532   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 533 };
 534
 535 VNET_FEATURE_INIT (ip6_vpath, static) =
 536 {
 537   .arc_name = "ip6-unicast",
 538   .node_name = "vpath-input-ip6",
 539   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 540 };
 541
 542 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 543 {
 544   .arc_name = "ip6-unicast",
 545   .node_name = "ip6-vxlan-bypass",
 546   .runs_before = VNET_FEATURES ("ip6-lookup"),
 547 };
 548
 549 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 550 {
 551   .arc_name = "ip6-unicast",
 552   .node_name = "ip6-not-enabled",
 553   .runs_before = VNET_FEATURES ("ip6-lookup"),
 554 };
 555
 556 VNET_FEATURE_INIT (ip6_lookup, static) =
 557 {
 558   .arc_name = "ip6-unicast",
 559   .node_name = "ip6-lookup",
 560   .runs_before = 0,  /*last feature*/
 561 };
 562
 563 /* Built-in ip6 multicast rx feature path definition (none now) */
 564 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 565 {
 566   .arc_name  = "ip6-multicast",
 567   .start_nodes = VNET_FEATURES ("ip6-input"),
 568   .last_in_arc = "ip6-mfib-forward-lookup",
 569   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 570 };
 571
 572 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 573   .arc_name = "ip6-multicast",
 574   .node_name = "vpath-input-ip6",
 575   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 576 };
 577
 578 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 579   .arc_name = "ip6-multicast",
 580   .node_name = "ip6-not-enabled",
 581   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 582 };
 583
 584 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 585   .arc_name = "ip6-multicast",
 586   .node_name = "ip6-mfib-forward-lookup",
 587   .runs_before = 0, /* last feature */
 588 };
 589
 590 /* Built-in ip4 tx feature path definition */
 591 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 592 {
 593   .arc_name  = "ip6-output",
 594   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 595   .last_in_arc = "interface-output",
 596   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 597 };
 598
 599 VNET_FEATURE_INIT (ip6_outacl, static) = {
 600   .arc_name = "ip6-output",
 601   .node_name = "ip6-outacl",
 602   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 603 };
 604
 605 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 606   .arc_name = "ip6-output",
 607   .node_name = "ipsec6-output-feature",
 608   .runs_before = VNET_FEATURES ("interface-output"),
 609 };
 610
 611 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 612   .arc_name = "ip6-output",
 613   .node_name = "interface-output",
 614   .runs_before = 0, /* not before any other features */
 615 };
 616 /* *INDENT-ON* */
 617
 618 static clib_error_t *
 619 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 620 {
 621   ip6_main_t *im = &ip6_main;
 622
 623   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 624   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 625
 626   if (!is_add)
 627     {
 628       /* Ensure that IPv6 is disabled */
 629       ip6_main_t *im6 = &ip6_main;
 630       ip_lookup_main_t *lm6 = &im6->lookup_main;
 631       ip_interface_address_t *ia = 0;
 632       ip6_address_t *address;
 633       vlib_main_t *vm = vlib_get_main ();
 634
 635       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 636       /* *INDENT-OFF* */
 637       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 638       ({
 639         address = ip_interface_address_get_address (lm6, ia);
 640         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 641       }));
 642       /* *INDENT-ON* */
 643       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 644     }
 645
 646   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 647                                is_add, 0, 0);
 648
 649   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 650                                sw_if_index, is_add, 0, 0);
 651
 652   return /* no error */ 0;
 653 }
 654
 655 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 656
 657 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 658                                 vlib_node_runtime_t * node,
 659                                 vlib_frame_t * frame)
 660 {
 661   return ip6_lookup_inline (vm, node, frame);
 662 }
 663
 664 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 665
 666 /* *INDENT-OFF* */
 667 VLIB_REGISTER_NODE (ip6_lookup_node) =
 668 {
 669   .name = "ip6-lookup",
 670   .vector_size = sizeof (u32),
 671   .format_trace = format_ip6_lookup_trace,
 672   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 673   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 674 };
 675 /* *INDENT-ON* */
 676
 677 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 678                                       vlib_node_runtime_t * node,
 679                                       vlib_frame_t * frame)
 680 {
 681   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 682   u32 n_left, *from;
 683   u32 thread_index = vm->thread_index;
 684   ip6_main_t *im = &ip6_main;
 685   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 686   u16 nexts[VLIB_FRAME_SIZE], *next;
 687
 688   from = vlib_frame_vector_args (frame);
 689   n_left = frame->n_vectors;
 690   next = nexts;
 691
 692   vlib_get_buffers (vm, from, bufs, n_left);
 693
 694   while (n_left >= 4)
 695     {
 696       const load_balance_t *lb0, *lb1;
 697       const ip6_header_t *ip0, *ip1;
 698       u32 lbi0, hc0, lbi1, hc1;
 699       const dpo_id_t *dpo0, *dpo1;
 700
 701       /* Prefetch next iteration. */
 702       {
 703         vlib_prefetch_buffer_header (b[2], STORE);
 704         vlib_prefetch_buffer_header (b[3], STORE);
 705
 706         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 707         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 708       }
 709
 710       ip0 = vlib_buffer_get_current (b[0]);
 711       ip1 = vlib_buffer_get_current (b[1]);
 712       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 713       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 714
 715       lb0 = load_balance_get (lbi0);
 716       lb1 = load_balance_get (lbi1);
 717
 718       /*
 719        * this node is for via FIBs we can re-use the hash value from the
 720        * to node if present.
 721        * We don't want to use the same hash value at each level in the recursion
 722        * graph as that would lead to polarisation
 723        */
 724       hc0 = hc1 = 0;
 725
 726       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 727         {
 728           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 729             {
 730               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 731                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 732             }
 733           else
 734             {
 735               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 736                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 737             }
 738           dpo0 = load_balance_get_fwd_bucket
 739             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 740         }
 741       else
 742         {
 743           dpo0 = load_balance_get_bucket_i (lb0, 0);
 744         }
 745       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 746         {
 747           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 748             {
 749               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 750                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 751             }
 752           else
 753             {
 754               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 755                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 756             }
 757           dpo1 = load_balance_get_fwd_bucket
 758             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 759         }
 760       else
 761         {
 762           dpo1 = load_balance_get_bucket_i (lb1, 0);
 763         }
 764
 765       next[0] = dpo0->dpoi_next_node;
 766       next[1] = dpo1->dpoi_next_node;
 767
 768       /* Only process the HBH Option Header if explicitly configured to do so */
 769       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 770         {
 771           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 772             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 773         }
 774       /* Only process the HBH Option Header if explicitly configured to do so */
 775       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 776         {
 777           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 778             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 779         }
 780
 781       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 782       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 783
 784       vlib_increment_combined_counter
 785         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 786       vlib_increment_combined_counter
 787         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 788
 789       b += 2;
 790       next += 2;
 791       n_left -= 2;
 792     }
 793
 794   while (n_left > 0)
 795     {
 796       const load_balance_t *lb0;
 797       const ip6_header_t *ip0;
 798       const dpo_id_t *dpo0;
 799       u32 lbi0, hc0;
 800
 801       ip0 = vlib_buffer_get_current (b[0]);
 802       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 803
 804       lb0 = load_balance_get (lbi0);
 805
 806       hc0 = 0;
 807       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 808         {
 809           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 810             {
 811               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 812                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 813             }
 814           else
 815             {
 816               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 817                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 818             }
 819           dpo0 = load_balance_get_fwd_bucket
 820             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 821         }
 822       else
 823         {
 824           dpo0 = load_balance_get_bucket_i (lb0, 0);
 825         }
 826
 827       next[0] = dpo0->dpoi_next_node;
 828       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 829
 830       /* Only process the HBH Option Header if explicitly configured to do so */
 831       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 832         {
 833           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 834             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 835         }
 836
 837       vlib_increment_combined_counter
 838         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 839
 840       b += 1;
 841       next += 1;
 842       n_left -= 1;
 843     }
 844
 845   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 846
 847   if (node->flags & VLIB_NODE_FLAG_TRACE)
 848     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 849
 850   return frame->n_vectors;
 851 }
 852
 853 /* *INDENT-OFF* */
 854 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 855 {
 856   .name = "ip6-load-balance",
 857   .vector_size = sizeof (u32),
 858   .sibling_of = "ip6-lookup",
 859   .format_trace = format_ip6_lookup_trace,
 860 };
 861 /* *INDENT-ON* */
 862
 863 typedef struct
 864 {
 865   /* Adjacency taken. */
 866   u32 adj_index;
 867   u32 flow_hash;
 868   u32 fib_index;
 869
 870   /* Packet data, possibly *after* rewrite. */
 871   u8 packet_data[128 - 1 * sizeof (u32)];
 872 }
 873 ip6_forward_next_trace_t;
 874
 875 #ifndef CLIB_MARCH_VARIANT
 876 u8 *
 877 format_ip6_forward_next_trace (u8 * s, va_list * args)
 878 {
 879   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 880   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 881   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 882   u32 indent = format_get_indent (s);
 883
 884   s = format (s, "%U%U",
 885               format_white_space, indent,
 886               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 887   return s;
 888 }
 889 #endif
 890
 891 static u8 *
 892 format_ip6_lookup_trace (u8 * s, va_list * args)
 893 {
 894   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 895   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 896   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 897   u32 indent = format_get_indent (s);
 898
 899   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 900               t->fib_index, t->adj_index, t->flow_hash);
 901   s = format (s, "\n%U%U",
 902               format_white_space, indent,
 903               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 904   return s;
 905 }
 906
 907
 908 static u8 *
 909 format_ip6_rewrite_trace (u8 * s, va_list * args)
 910 {
 911   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 912   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 913   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 914   u32 indent = format_get_indent (s);
 915
 916   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 917               t->fib_index, t->adj_index, format_ip_adjacency,
 918               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 919   s = format (s, "\n%U%U",
 920               format_white_space, indent,
 921               format_ip_adjacency_packet_data,
 922               t->packet_data, sizeof (t->packet_data));
 923   return s;
 924 }
 925
 926 /* Common trace function for all ip6-forward next nodes. */
 927 #ifndef CLIB_MARCH_VARIANT
 928 void
 929 ip6_forward_next_trace (vlib_main_t * vm,
 930                         vlib_node_runtime_t * node,
 931                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
 932 {
 933   u32 *from, n_left;
 934   ip6_main_t *im = &ip6_main;
 935
 936   n_left = frame->n_vectors;
 937   from = vlib_frame_vector_args (frame);
 938
 939   while (n_left >= 4)
 940     {
 941       u32 bi0, bi1;
 942       vlib_buffer_t *b0, *b1;
 943       ip6_forward_next_trace_t *t0, *t1;
 944
 945       /* Prefetch next iteration. */
 946       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 947       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 948
 949       bi0 = from[0];
 950       bi1 = from[1];
 951
 952       b0 = vlib_get_buffer (vm, bi0);
 953       b1 = vlib_get_buffer (vm, bi1);
 954
 955       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 956         {
 957           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 958           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 959           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 960           t0->fib_index =
 961             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
 962              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
 963             vec_elt (im->fib_index_by_sw_if_index,
 964                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 965
 966           clib_memcpy_fast (t0->packet_data,
 967                             vlib_buffer_get_current (b0),
 968                             sizeof (t0->packet_data));
 969         }
 970       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 971         {
 972           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 973           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 974           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 975           t1->fib_index =
 976             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
 977              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
 978             vec_elt (im->fib_index_by_sw_if_index,
 979                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
 980
 981           clib_memcpy_fast (t1->packet_data,
 982                             vlib_buffer_get_current (b1),
 983                             sizeof (t1->packet_data));
 984         }
 985       from += 2;
 986       n_left -= 2;
 987     }
 988
 989   while (n_left >= 1)
 990     {
 991       u32 bi0;
 992       vlib_buffer_t *b0;
 993       ip6_forward_next_trace_t *t0;
 994
 995       bi0 = from[0];
 996
 997       b0 = vlib_get_buffer (vm, bi0);
 998
 999       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1000         {
1001           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1002           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1003           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1004           t0->fib_index =
1005             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1006              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1007             vec_elt (im->fib_index_by_sw_if_index,
1008                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1009
1010           clib_memcpy_fast (t0->packet_data,
1011                             vlib_buffer_get_current (b0),
1012                             sizeof (t0->packet_data));
1013         }
1014       from += 1;
1015       n_left -= 1;
1016     }
1017 }
1018
1019 /* Compute TCP/UDP/ICMP6 checksum in software. */
1020 u16
1021 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1022                                    ip6_header_t * ip0, int *bogus_lengthp)
1023 {
1024   ip_csum_t sum0;
1025   u16 payload_length_host_byte_order;
1026   u32 i;
1027   u32 headers_size = sizeof (ip0[0]);
1028   u8 *data_this_buffer;
1029
1030   ASSERT (bogus_lengthp);
1031   *bogus_lengthp = 0;
1032
1033   /* Initialize checksum with ip header. */
1034   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1035   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1036   data_this_buffer = (u8 *) (ip0 + 1);
1037
1038   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1039     {
1040       sum0 = ip_csum_with_carry
1041         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1042       sum0 = ip_csum_with_carry
1043         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1044     }
1045
1046   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1047    * or UDP-Ping packets */
1048   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1049     {
1050       u32 skip_bytes;
1051       ip6_hop_by_hop_ext_t *ext_hdr =
1052         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1053
1054       /* validate really icmp6 next */
1055       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1056               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1057
1058       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1059       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1060
1061       payload_length_host_byte_order -= skip_bytes;
1062       headers_size += skip_bytes;
1063     }
1064
1065   if (p0)
1066     return ip_calculate_l4_checksum (vm, p0, sum0,
1067                                      payload_length_host_byte_order,
1068                                      (u8 *) ip0, headers_size, NULL);
1069   else
1070     return ip_calculate_l4_checksum (vm, 0, sum0,
1071                                      payload_length_host_byte_order, NULL, 0,
1072                                      data_this_buffer);
1073 }
1074
1075 u32
1076 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1077 {
1078   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1079   udp_header_t *udp0;
1080   u16 sum16;
1081   int bogus_length;
1082
1083   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1084   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1085           || ip0->protocol == IP_PROTOCOL_ICMP6
1086           || ip0->protocol == IP_PROTOCOL_UDP
1087           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1088
1089   udp0 = (void *) (ip0 + 1);
1090   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1091     {
1092       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1093                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1094       return p0->flags;
1095     }
1096
1097   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1098
1099   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1100                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1101
1102   return p0->flags;
1103 }
1104 #endif
1105
1106 /**
1107  * @brief returns number of links on which src is reachable.
1108  */
1109 always_inline int
1110 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1111 {
1112   const load_balance_t *lb0;
1113   index_t lbi;
1114   u32 fib_index;
1115
1116   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1117                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1118   fib_index =
1119     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1120     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1121
1122   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1123   lb0 = load_balance_get (lbi);
1124
1125   return (fib_urpf_check_size (lb0->lb_urpf));
1126 }
1127
1128 always_inline u8
1129 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1130                            u32 * udp_offset0)
1131 {
1132   u32 proto0;
1133   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1134   if (proto0 != IP_PROTOCOL_UDP)
1135     {
1136       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1137       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1138     }
1139   return proto0;
1140 }
1141
1142 /* *INDENT-OFF* */
1143 VNET_FEATURE_ARC_INIT (ip6_local) =
1144 {
1145   .arc_name  = "ip6-local",
1146   .start_nodes = VNET_FEATURES ("ip6-local"),
1147 };
1148 /* *INDENT-ON* */
1149
1150 static_always_inline u8
1151 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1152 {
1153
1154   u16 payload_length_host_byte_order;
1155   u32 n_this_buffer, n_bytes_left;
1156   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1157   u32 headers_size = sizeof (ip0[0]);
1158   u8 *data_this_buffer;
1159
1160
1161   data_this_buffer = (u8 *) (ip0 + 1);
1162
1163   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1164
1165   /* validate really icmp6 next */
1166
1167   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1168       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1169     return 0;
1170
1171
1172   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1173   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1174
1175
1176   u32 n_ip_bytes_this_buffer =
1177     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1178   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1179     {
1180       n_this_buffer = p0->current_length > headers_size ?
1181         n_ip_bytes_this_buffer - headers_size : 0;
1182     }
1183
1184   n_bytes_left -= n_this_buffer;
1185   n_bytes_left -= p0->total_length_not_including_first_buffer;
1186
1187   if (n_bytes_left == 0)
1188     return 0;
1189   else
1190     return 1;
1191 }
1192
1193
1194 always_inline uword
1195 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1196                   vlib_frame_t * frame, int head_of_feature_arc)
1197 {
1198   ip6_main_t *im = &ip6_main;
1199   ip_lookup_main_t *lm = &im->lookup_main;
1200   u32 *from, n_left_from;
1201   vlib_node_runtime_t *error_node =
1202     vlib_node_get_runtime (vm, ip6_input_node.index);
1203   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1204   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1205   u16 nexts[VLIB_FRAME_SIZE], *next;
1206
1207   from = vlib_frame_vector_args (frame);
1208   n_left_from = frame->n_vectors;
1209
1210   if (node->flags & VLIB_NODE_FLAG_TRACE)
1211     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1212
1213   vlib_get_buffers (vm, from, bufs, n_left_from);
1214   b = bufs;
1215   next = nexts;
1216
1217   while (n_left_from > 2)
1218     {
1219       /* Prefetch next iteration. */
1220       if (n_left_from >= 6)
1221         {
1222           vlib_prefetch_buffer_header (b[4], STORE);
1223           vlib_prefetch_buffer_header (b[5], STORE);
1224           vlib_prefetch_buffer_data (b[2], LOAD);
1225           vlib_prefetch_buffer_data (b[3], LOAD);
1226         }
1227
1228       u8 error[2];
1229       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1230       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1231
1232       ip6_header_t *ip[2];
1233       ip[0] = vlib_buffer_get_current (b[0]);
1234       ip[1] = vlib_buffer_get_current (b[1]);
1235
1236       if (head_of_feature_arc)
1237         {
1238           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1239           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1240
1241           u8 type[2];
1242           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1243           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1244
1245           u32 flags[2];
1246           flags[0] = b[0]->flags;
1247           flags[1] = b[1]->flags;
1248
1249           u32 good_l4_csum[2];
1250           good_l4_csum[0] =
1251             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1252                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1253                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1254           good_l4_csum[1] =
1255             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1256                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1257                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1258
1259           u32 udp_offset[2] = { };
1260           u8 is_tcp_udp[2];
1261           is_tcp_udp[0] =
1262             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1263           is_tcp_udp[1] =
1264             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1265           i16 len_diff[2] = { 0 };
1266           if (PREDICT_TRUE (is_tcp_udp[0]))
1267             {
1268               udp_header_t *udp =
1269                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1270               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1271                 && udp->checksum == 0;
1272               /* optimistically verify UDP length. */
1273               u16 ip_len, udp_len;
1274               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1275               udp_len = clib_net_to_host_u16 (udp->length);
1276               len_diff[0] = ip_len - udp_len;
1277             }
1278           if (PREDICT_TRUE (is_tcp_udp[1]))
1279             {
1280               udp_header_t *udp =
1281                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1282               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1283                 && udp->checksum == 0;
1284               /* optimistically verify UDP length. */
1285               u16 ip_len, udp_len;
1286               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1287               udp_len = clib_net_to_host_u16 (udp->length);
1288               len_diff[1] = ip_len - udp_len;
1289             }
1290
1291           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1292           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1293
1294           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1295           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1296
1297           u8 need_csum[2];
1298           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1299             && !good_l4_csum[0]
1300             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1301           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1302             && !good_l4_csum[1]
1303             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1304           if (PREDICT_FALSE (need_csum[0]))
1305             {
1306               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1307               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1308               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1309             }
1310           else
1311             {
1312               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1313                 error[0] = IP6_ERROR_BAD_LENGTH;
1314             }
1315           if (PREDICT_FALSE (need_csum[1]))
1316             {
1317               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1318               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1319               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1320             }
1321           else
1322             {
1323               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1324                 error[1] = IP6_ERROR_BAD_LENGTH;
1325             }
1326
1327
1328           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1329
1330           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1331
1332           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1333                          IP6_ERROR_UDP_CHECKSUM,
1334                          "Wrong IP6 errors constants");
1335           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1336                          IP6_ERROR_ICMP_CHECKSUM,
1337                          "Wrong IP6 errors constants");
1338
1339           error[0] =
1340             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1341           error[1] =
1342             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1343
1344           /* Drop packets from unroutable hosts. */
1345           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1346           u8 unroutable[2];
1347           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1348             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1349             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1350           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1351             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1352             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1353           if (PREDICT_FALSE (unroutable[0]))
1354             {
1355               error[0] =
1356                 !ip6_urpf_loose_check (im, b[0],
1357                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1358                 : error[0];
1359             }
1360           if (PREDICT_FALSE (unroutable[1]))
1361             {
1362               error[1] =
1363                 !ip6_urpf_loose_check (im, b[1],
1364                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1365                 : error[1];
1366             }
1367
1368           vnet_buffer (b[0])->ip.fib_index =
1369             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1370             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1371             vnet_buffer (b[0])->ip.fib_index;
1372           vnet_buffer (b[1])->ip.fib_index =
1373             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1374             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1375             vnet_buffer (b[1])->ip.fib_index;
1376         }                       /* head_of_feature_arc */
1377
1378       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1379       next[0] =
1380         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1381       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1382       next[1] =
1383         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1384
1385       b[0]->error = error_node->errors[0];
1386       b[1]->error = error_node->errors[1];
1387
1388       if (head_of_feature_arc)
1389         {
1390           u8 ip6_unknown[2];
1391           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1392           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1393           if (PREDICT_TRUE (ip6_unknown[0]))
1394             {
1395               u32 next32 = next[0];
1396               vnet_feature_arc_start (arc_index,
1397                                       vnet_buffer (b[0])->sw_if_index
1398                                       [VLIB_RX], &next32, b[0]);
1399               next[0] = next32;
1400             }
1401           if (PREDICT_TRUE (ip6_unknown[1]))
1402             {
1403               u32 next32 = next[1];
1404               vnet_feature_arc_start (arc_index,
1405                                       vnet_buffer (b[1])->sw_if_index
1406                                       [VLIB_RX], &next32, b[1]);
1407               next[1] = next32;
1408             }
1409         }
1410
1411       /* next */
1412       b += 2;
1413       next += 2;
1414       n_left_from -= 2;
1415     }
1416
1417   while (n_left_from)
1418     {
1419       u8 error;
1420       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1421
1422       ip6_header_t *ip;
1423       ip = vlib_buffer_get_current (b[0]);
1424
1425       if (head_of_feature_arc)
1426         {
1427           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1428           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1429
1430           u32 flags = b[0]->flags;
1431           u32 good_l4_csum =
1432             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1433                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1434                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1435
1436           u32 udp_offset;
1437           i16 len_diff = 0;
1438           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1439           if (PREDICT_TRUE (is_tcp_udp))
1440             {
1441               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1442               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1443               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1444                 && udp->checksum == 0;
1445               /* optimistically verify UDP length. */
1446               u16 ip_len, udp_len;
1447               ip_len = clib_net_to_host_u16 (ip->payload_length);
1448               udp_len = clib_net_to_host_u16 (udp->length);
1449               len_diff = ip_len - udp_len;
1450             }
1451
1452           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1453           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1454
1455           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1456             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1457           if (PREDICT_FALSE (need_csum))
1458             {
1459               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1460               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1461               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1462             }
1463           else
1464             {
1465               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1466                 error = IP6_ERROR_BAD_LENGTH;
1467             }
1468
1469
1470
1471           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1472
1473           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1474                          IP6_ERROR_UDP_CHECKSUM,
1475                          "Wrong IP6 errors constants");
1476           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1477                          IP6_ERROR_ICMP_CHECKSUM,
1478                          "Wrong IP6 errors constants");
1479
1480           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1481
1482           /* Drop packets from unroutable hosts. */
1483           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1484           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1485             && type != IP_BUILTIN_PROTOCOL_ICMP
1486             && !ip6_address_is_link_local_unicast (&ip->src_address);
1487           if (PREDICT_FALSE (unroutable))
1488             {
1489               error =
1490                 !ip6_urpf_loose_check (im, b[0],
1491                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1492                 error;
1493             }
1494
1495           vnet_buffer (b[0])->ip.fib_index =
1496             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1497             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1498             vnet_buffer (b[0])->ip.fib_index;
1499         }                       /* head_of_feature_arc */
1500
1501       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1502       next[0] =
1503         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1504
1505       b[0]->error = error_node->errors[0];
1506
1507       if (head_of_feature_arc)
1508         {
1509           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1510             {
1511               u32 next32 = next[0];
1512               vnet_feature_arc_start (arc_index,
1513                                       vnet_buffer (b[0])->sw_if_index
1514                                       [VLIB_RX], &next32, b[0]);
1515               next[0] = next32;
1516             }
1517         }
1518
1519       /* next */
1520       b += 1;
1521       next += 1;
1522       n_left_from -= 1;
1523     }
1524
1525   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1526   return frame->n_vectors;
1527 }
1528
1529 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1530                                vlib_frame_t * frame)
1531 {
1532   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1533 }
1534
1535 /* *INDENT-OFF* */
1536 VLIB_REGISTER_NODE (ip6_local_node) =
1537 {
1538   .name = "ip6-local",
1539   .vector_size = sizeof (u32),
1540   .format_trace = format_ip6_forward_next_trace,
1541   .n_next_nodes = IP_LOCAL_N_NEXT,
1542   .next_nodes =
1543   {
1544     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1545     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1546     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1547     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1548     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1549   },
1550 };
1551 /* *INDENT-ON* */
1552
1553 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1554                                           vlib_node_runtime_t * node,
1555                                           vlib_frame_t * frame)
1556 {
1557   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1558 }
1559
1560 /* *INDENT-OFF* */
1561 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1562   .name = "ip6-local-end-of-arc",
1563   .vector_size = sizeof (u32),
1564
1565   .format_trace = format_ip6_forward_next_trace,
1566   .sibling_of = "ip6-local",
1567 };
1568
1569 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1570   .arc_name = "ip6-local",
1571   .node_name = "ip6-local-end-of-arc",
1572   .runs_before = 0, /* not before any other features */
1573 };
1574 /* *INDENT-ON* */
1575
1576 #ifdef CLIB_MARCH_VARIANT
1577 extern vlib_node_registration_t ip6_local_node;
1578 #else
1579 void
1580 ip6_register_protocol (u32 protocol, u32 node_index)
1581 {
1582   vlib_main_t *vm = vlib_get_main ();
1583   ip6_main_t *im = &ip6_main;
1584   ip_lookup_main_t *lm = &im->lookup_main;
1585
1586   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1587   lm->local_next_by_ip_protocol[protocol] =
1588     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1589 }
1590
1591 void
1592 ip6_unregister_protocol (u32 protocol)
1593 {
1594   ip6_main_t *im = &ip6_main;
1595   ip_lookup_main_t *lm = &im->lookup_main;
1596
1597   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1598   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1599 }
1600 #endif
1601
1602 typedef enum
1603 {
1604   IP6_REWRITE_NEXT_DROP,
1605   IP6_REWRITE_NEXT_ICMP_ERROR,
1606   IP6_REWRITE_NEXT_FRAGMENT,
1607   IP6_REWRITE_N_NEXT            /* Last */
1608 } ip6_rewrite_next_t;
1609
1610 /**
1611  * This bits of an IPv6 address to mask to construct a multicast
1612  * MAC address
1613  */
1614 #define IP6_MCAST_ADDR_MASK 0xffffffff
1615
1616 always_inline void
1617 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1618                u16 adj_packet_bytes, bool is_locally_generated,
1619                u32 * next, u8 is_midchain, u32 * error)
1620 {
1621   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1622     {
1623       if (is_locally_generated)
1624         {
1625           /* IP fragmentation */
1626           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1627                                    (is_midchain ?
1628                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1629                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1630           *next = IP6_REWRITE_NEXT_FRAGMENT;
1631           *error = IP6_ERROR_MTU_EXCEEDED;
1632         }
1633       else
1634         {
1635           *error = IP6_ERROR_MTU_EXCEEDED;
1636           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1637                                        adj_packet_bytes);
1638           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1639         }
1640     }
1641 }
1642
1643 always_inline uword
1644 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1645                              vlib_node_runtime_t * node,
1646                              vlib_frame_t * frame,
1647                              int do_counters, int is_midchain, int is_mcast)
1648 {
1649   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1650   u32 *from = vlib_frame_vector_args (frame);
1651   u32 n_left_from, n_left_to_next, *to_next, next_index;
1652   vlib_node_runtime_t *error_node =
1653     vlib_node_get_runtime (vm, ip6_input_node.index);
1654
1655   n_left_from = frame->n_vectors;
1656   next_index = node->cached_next_index;
1657   u32 thread_index = vm->thread_index;
1658
1659   while (n_left_from > 0)
1660     {
1661       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1662
1663       while (n_left_from >= 4 && n_left_to_next >= 2)
1664         {
1665           const ip_adjacency_t *adj0, *adj1;
1666           vlib_buffer_t *p0, *p1;
1667           ip6_header_t *ip0, *ip1;
1668           u32 pi0, rw_len0, next0, error0, adj_index0;
1669           u32 pi1, rw_len1, next1, error1, adj_index1;
1670           u32 tx_sw_if_index0, tx_sw_if_index1;
1671           bool is_locally_originated0, is_locally_originated1;
1672
1673           /* Prefetch next iteration. */
1674           {
1675             vlib_buffer_t *p2, *p3;
1676
1677             p2 = vlib_get_buffer (vm, from[2]);
1678             p3 = vlib_get_buffer (vm, from[3]);
1679
1680             vlib_prefetch_buffer_header (p2, LOAD);
1681             vlib_prefetch_buffer_header (p3, LOAD);
1682
1683             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1684             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1685
1686             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1687             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1688           }
1689
1690           pi0 = to_next[0] = from[0];
1691           pi1 = to_next[1] = from[1];
1692
1693           from += 2;
1694           n_left_from -= 2;
1695           to_next += 2;
1696           n_left_to_next -= 2;
1697
1698           p0 = vlib_get_buffer (vm, pi0);
1699           p1 = vlib_get_buffer (vm, pi1);
1700
1701           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1702           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1703
1704           ip0 = vlib_buffer_get_current (p0);
1705           ip1 = vlib_buffer_get_current (p1);
1706
1707           error0 = error1 = IP6_ERROR_NONE;
1708           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1709
1710           is_locally_originated0 =
1711             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1712           if (PREDICT_TRUE (!is_locally_originated0))
1713             {
1714               i32 hop_limit0 = ip0->hop_limit;
1715
1716               /* Input node should have reject packets with hop limit 0. */
1717               ASSERT (ip0->hop_limit > 0);
1718
1719               hop_limit0 -= 1;
1720
1721               ip0->hop_limit = hop_limit0;
1722
1723               /*
1724                * If the hop count drops below 1 when forwarding, generate
1725                * an ICMP response.
1726                */
1727               if (PREDICT_FALSE (hop_limit0 <= 0))
1728                 {
1729                   error0 = IP6_ERROR_TIME_EXPIRED;
1730                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1731                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1732                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1733                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1734                                                0);
1735                 }
1736             }
1737           else
1738             {
1739               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1740             }
1741           is_locally_originated1 =
1742             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1743           if (PREDICT_TRUE (!is_locally_originated1))
1744             {
1745               i32 hop_limit1 = ip1->hop_limit;
1746
1747               /* Input node should have reject packets with hop limit 0. */
1748               ASSERT (ip1->hop_limit > 0);
1749
1750               hop_limit1 -= 1;
1751
1752               ip1->hop_limit = hop_limit1;
1753
1754               /*
1755                * If the hop count drops below 1 when forwarding, generate
1756                * an ICMP response.
1757                */
1758               if (PREDICT_FALSE (hop_limit1 <= 0))
1759                 {
1760                   error1 = IP6_ERROR_TIME_EXPIRED;
1761                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1762                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1763                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1764                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1765                                                0);
1766                 }
1767             }
1768           else
1769             {
1770               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1771             }
1772           adj0 = adj_get (adj_index0);
1773           adj1 = adj_get (adj_index1);
1774
1775           rw_len0 = adj0[0].rewrite_header.data_bytes;
1776           rw_len1 = adj1[0].rewrite_header.data_bytes;
1777           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1778           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1779
1780           if (do_counters)
1781             {
1782               vlib_increment_combined_counter
1783                 (&adjacency_counters,
1784                  thread_index, adj_index0, 1,
1785                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1786               vlib_increment_combined_counter
1787                 (&adjacency_counters,
1788                  thread_index, adj_index1, 1,
1789                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1790             }
1791
1792           /* Check MTU of outgoing interface. */
1793           u16 ip0_len =
1794             clib_net_to_host_u16 (ip0->payload_length) +
1795             sizeof (ip6_header_t);
1796           u16 ip1_len =
1797             clib_net_to_host_u16 (ip1->payload_length) +
1798             sizeof (ip6_header_t);
1799           if (p0->flags & VNET_BUFFER_F_GSO)
1800             ip0_len = gso_mtu_sz (p0);
1801           if (p1->flags & VNET_BUFFER_F_GSO)
1802             ip1_len = gso_mtu_sz (p1);
1803
1804
1805
1806           ip6_mtu_check (p0, ip0_len,
1807                          adj0[0].rewrite_header.max_l3_packet_bytes,
1808                          is_locally_originated0, &next0, is_midchain,
1809                          &error0);
1810           ip6_mtu_check (p1, ip1_len,
1811                          adj1[0].rewrite_header.max_l3_packet_bytes,
1812                          is_locally_originated1, &next1, is_midchain,
1813                          &error1);
1814
1815           /* Don't adjust the buffer for hop count issue; icmp-error node
1816            * wants to see the IP header */
1817           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1818             {
1819               p0->current_data -= rw_len0;
1820               p0->current_length += rw_len0;
1821
1822               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1823               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1824               next0 = adj0[0].rewrite_header.next_index;
1825
1826               if (PREDICT_FALSE
1827                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1828                 vnet_feature_arc_start (lm->output_feature_arc_index,
1829                                         tx_sw_if_index0, &next0, p0);
1830             }
1831           else
1832             {
1833               p0->error = error_node->errors[error0];
1834             }
1835           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1836             {
1837               p1->current_data -= rw_len1;
1838               p1->current_length += rw_len1;
1839
1840               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1841               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1842               next1 = adj1[0].rewrite_header.next_index;
1843
1844               if (PREDICT_FALSE
1845                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1846                 vnet_feature_arc_start (lm->output_feature_arc_index,
1847                                         tx_sw_if_index1, &next1, p1);
1848             }
1849           else
1850             {
1851               p1->error = error_node->errors[error1];
1852             }
1853
1854           if (is_midchain)
1855             {
1856               /* before we paint on the next header, update the L4
1857                * checksums if required, since there's no offload on a tunnel */
1858               calc_checksums (vm, p0);
1859               calc_checksums (vm, p1);
1860             }
1861
1862           /* Guess we are only writing on simple Ethernet header. */
1863           vnet_rewrite_two_headers (adj0[0], adj1[0],
1864                                     ip0, ip1, sizeof (ethernet_header_t));
1865
1866           if (is_midchain)
1867             {
1868               if (adj0->sub_type.midchain.fixup_func)
1869                 adj0->sub_type.midchain.fixup_func
1870                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1871               if (adj1->sub_type.midchain.fixup_func)
1872                 adj1->sub_type.midchain.fixup_func
1873                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1874             }
1875           if (is_mcast)
1876             {
1877               /*
1878                * copy bytes from the IP address into the MAC rewrite
1879                */
1880               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1881                                           adj0->
1882                                           rewrite_header.dst_mcast_offset,
1883                                           &ip0->dst_address.as_u32[3],
1884                                           (u8 *) ip0);
1885               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1886                                           adj1->
1887                                           rewrite_header.dst_mcast_offset,
1888                                           &ip1->dst_address.as_u32[3],
1889                                           (u8 *) ip1);
1890             }
1891
1892           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1893                                            to_next, n_left_to_next,
1894                                            pi0, pi1, next0, next1);
1895         }
1896
1897       while (n_left_from > 0 && n_left_to_next > 0)
1898         {
1899           ip_adjacency_t *adj0;
1900           vlib_buffer_t *p0;
1901           ip6_header_t *ip0;
1902           u32 pi0, rw_len0;
1903           u32 adj_index0, next0, error0;
1904           u32 tx_sw_if_index0;
1905           bool is_locally_originated0;
1906
1907           pi0 = to_next[0] = from[0];
1908
1909           p0 = vlib_get_buffer (vm, pi0);
1910
1911           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1912
1913           adj0 = adj_get (adj_index0);
1914
1915           ip0 = vlib_buffer_get_current (p0);
1916
1917           error0 = IP6_ERROR_NONE;
1918           next0 = IP6_REWRITE_NEXT_DROP;
1919
1920           /* Check hop limit */
1921           is_locally_originated0 =
1922             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1923           if (PREDICT_TRUE (!is_locally_originated0))
1924             {
1925               i32 hop_limit0 = ip0->hop_limit;
1926
1927               ASSERT (ip0->hop_limit > 0);
1928
1929               hop_limit0 -= 1;
1930
1931               ip0->hop_limit = hop_limit0;
1932
1933               if (PREDICT_FALSE (hop_limit0 <= 0))
1934                 {
1935                   /*
1936                    * If the hop count drops below 1 when forwarding, generate
1937                    * an ICMP response.
1938                    */
1939                   error0 = IP6_ERROR_TIME_EXPIRED;
1940                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1941                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1942                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1943                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1944                                                0);
1945                 }
1946             }
1947           else
1948             {
1949               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1950             }
1951
1952           if (is_midchain)
1953             {
1954               calc_checksums (vm, p0);
1955             }
1956
1957           /* Guess we are only writing on simple Ethernet header. */
1958           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1959
1960           /* Update packet buffer attributes/set output interface. */
1961           rw_len0 = adj0[0].rewrite_header.data_bytes;
1962           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1963
1964           if (do_counters)
1965             {
1966               vlib_increment_combined_counter
1967                 (&adjacency_counters,
1968                  thread_index, adj_index0, 1,
1969                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1970             }
1971
1972           /* Check MTU of outgoing interface. */
1973           u16 ip0_len =
1974             clib_net_to_host_u16 (ip0->payload_length) +
1975             sizeof (ip6_header_t);
1976           if (p0->flags & VNET_BUFFER_F_GSO)
1977             ip0_len = gso_mtu_sz (p0);
1978
1979           ip6_mtu_check (p0, ip0_len,
1980                          adj0[0].rewrite_header.max_l3_packet_bytes,
1981                          is_locally_originated0, &next0, is_midchain,
1982                          &error0);
1983
1984           /* Don't adjust the buffer for hop count issue; icmp-error node
1985            * wants to see the IP header */
1986           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1987             {
1988               p0->current_data -= rw_len0;
1989               p0->current_length += rw_len0;
1990
1991               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1992
1993               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1994               next0 = adj0[0].rewrite_header.next_index;
1995
1996               if (PREDICT_FALSE
1997                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1998                 vnet_feature_arc_start (lm->output_feature_arc_index,
1999                                         tx_sw_if_index0, &next0, p0);
2000             }
2001           else
2002             {
2003               p0->error = error_node->errors[error0];
2004             }
2005
2006           if (is_midchain)
2007             {
2008               if (adj0->sub_type.midchain.fixup_func)
2009                 adj0->sub_type.midchain.fixup_func
2010                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2011             }
2012           if (is_mcast)
2013             {
2014               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2015                                           adj0->
2016                                           rewrite_header.dst_mcast_offset,
2017                                           &ip0->dst_address.as_u32[3],
2018                                           (u8 *) ip0);
2019             }
2020
2021           from += 1;
2022           n_left_from -= 1;
2023           to_next += 1;
2024           n_left_to_next -= 1;
2025
2026           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2027                                            to_next, n_left_to_next,
2028                                            pi0, next0);
2029         }
2030
2031       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2032     }
2033
2034   /* Need to do trace after rewrites to pick up new packet data. */
2035   if (node->flags & VLIB_NODE_FLAG_TRACE)
2036     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2037
2038   return frame->n_vectors;
2039 }
2040
2041 always_inline uword
2042 ip6_rewrite_inline (vlib_main_t * vm,
2043                     vlib_node_runtime_t * node,
2044                     vlib_frame_t * frame,
2045                     int do_counters, int is_midchain, int is_mcast)
2046 {
2047   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2048                                       is_midchain, is_mcast);
2049 }
2050
2051 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2052                                  vlib_node_runtime_t * node,
2053                                  vlib_frame_t * frame)
2054 {
2055   if (adj_are_counters_enabled ())
2056     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2057   else
2058     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2059 }
2060
2061 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2062                                        vlib_node_runtime_t * node,
2063                                        vlib_frame_t * frame)
2064 {
2065   if (adj_are_counters_enabled ())
2066     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2067   else
2068     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2069 }
2070
2071 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2072                                        vlib_node_runtime_t * node,
2073                                        vlib_frame_t * frame)
2074 {
2075   if (adj_are_counters_enabled ())
2076     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2077   else
2078     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2079 }
2080
2081 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2082                                   vlib_node_runtime_t * node,
2083                                   vlib_frame_t * frame)
2084 {
2085   if (adj_are_counters_enabled ())
2086     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2087   else
2088     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2089 }
2090
2091 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2092                                         vlib_node_runtime_t * node,
2093                                         vlib_frame_t * frame)
2094 {
2095   if (adj_are_counters_enabled ())
2096     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2097   else
2098     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2099 }
2100
2101 /* *INDENT-OFF* */
2102 VLIB_REGISTER_NODE (ip6_midchain_node) =
2103 {
2104   .name = "ip6-midchain",
2105   .vector_size = sizeof (u32),
2106   .format_trace = format_ip6_forward_next_trace,
2107   .sibling_of = "ip6-rewrite",
2108   };
2109
2110 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2111 {
2112   .name = "ip6-rewrite",
2113   .vector_size = sizeof (u32),
2114   .format_trace = format_ip6_rewrite_trace,
2115   .n_next_nodes = IP6_REWRITE_N_NEXT,
2116   .next_nodes =
2117   {
2118     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2119     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2120     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2121   },
2122 };
2123
2124 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2125   .name = "ip6-rewrite-bcast",
2126   .vector_size = sizeof (u32),
2127
2128   .format_trace = format_ip6_rewrite_trace,
2129   .sibling_of = "ip6-rewrite",
2130 };
2131
2132 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2133 {
2134   .name = "ip6-rewrite-mcast",
2135   .vector_size = sizeof (u32),
2136   .format_trace = format_ip6_rewrite_trace,
2137   .sibling_of = "ip6-rewrite",
2138 };
2139
2140
2141 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2142 {
2143   .name = "ip6-mcast-midchain",
2144   .vector_size = sizeof (u32),
2145   .format_trace = format_ip6_rewrite_trace,
2146   .sibling_of = "ip6-rewrite",
2147 };
2148
2149 /* *INDENT-ON* */
2150
2151 /*
2152  * Hop-by-Hop handling
2153  */
2154 #ifndef CLIB_MARCH_VARIANT
2155 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2156 #endif /* CLIB_MARCH_VARIANT */
2157
2158 #define foreach_ip6_hop_by_hop_error \
2159 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2160 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2161 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2162
2163 /* *INDENT-OFF* */
2164 typedef enum
2165 {
2166 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2167   foreach_ip6_hop_by_hop_error
2168 #undef _
2169   IP6_HOP_BY_HOP_N_ERROR,
2170 } ip6_hop_by_hop_error_t;
2171 /* *INDENT-ON* */
2172
2173 /*
2174  * Primary h-b-h handler trace support
2175  * We work pretty hard on the problem for obvious reasons
2176  */
2177 typedef struct
2178 {
2179   u32 next_index;
2180   u32 trace_len;
2181   u8 option_data[256];
2182 } ip6_hop_by_hop_trace_t;
2183
2184 extern vlib_node_registration_t ip6_hop_by_hop_node;
2185
2186 static char *ip6_hop_by_hop_error_strings[] = {
2187 #define _(sym,string) string,
2188   foreach_ip6_hop_by_hop_error
2189 #undef _
2190 };
2191
2192 #ifndef CLIB_MARCH_VARIANT
2193 u8 *
2194 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2195 {
2196   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2197   int total_len = va_arg (*args, int);
2198   ip6_hop_by_hop_option_t *opt0, *limit0;
2199   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2200   u8 type0;
2201
2202   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2203               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2204
2205   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2206   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2207
2208   while (opt0 < limit0)
2209     {
2210       type0 = opt0->type;
2211       switch (type0)
2212         {
2213         case 0:         /* Pad, just stop */
2214           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2215           break;
2216
2217         default:
2218           if (hm->trace[type0])
2219             {
2220               s = (*hm->trace[type0]) (s, opt0);
2221             }
2222           else
2223             {
2224               s =
2225                 format (s, "\n    unrecognized option %d length %d", type0,
2226                         opt0->length);
2227             }
2228           opt0 =
2229             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2230                                          sizeof (ip6_hop_by_hop_option_t));
2231           break;
2232         }
2233     }
2234   return s;
2235 }
2236 #endif
2237
2238 static u8 *
2239 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2240 {
2241   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2242   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2243   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2244   ip6_hop_by_hop_header_t *hbh0;
2245   ip6_hop_by_hop_option_t *opt0, *limit0;
2246   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2247
2248   u8 type0;
2249
2250   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2251
2252   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2253               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2254
2255   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2256   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2257
2258   while (opt0 < limit0)
2259     {
2260       type0 = opt0->type;
2261       switch (type0)
2262         {
2263         case 0:         /* Pad, just stop */
2264           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2265           break;
2266
2267         default:
2268           if (hm->trace[type0])
2269             {
2270               s = (*hm->trace[type0]) (s, opt0);
2271             }
2272           else
2273             {
2274               s =
2275                 format (s, "\n    unrecognized option %d length %d", type0,
2276                         opt0->length);
2277             }
2278           opt0 =
2279             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2280                                          sizeof (ip6_hop_by_hop_option_t));
2281           break;
2282         }
2283     }
2284   return s;
2285 }
2286
2287 always_inline u8
2288 ip6_scan_hbh_options (vlib_buffer_t * b0,
2289                       ip6_header_t * ip0,
2290                       ip6_hop_by_hop_header_t * hbh0,
2291                       ip6_hop_by_hop_option_t * opt0,
2292                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2293 {
2294   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2295   u8 type0;
2296   u8 error0 = 0;
2297
2298   while (opt0 < limit0)
2299     {
2300       type0 = opt0->type;
2301       switch (type0)
2302         {
2303         case 0:         /* Pad1 */
2304           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2305           continue;
2306         case 1:         /* PadN */
2307           break;
2308         default:
2309           if (hm->options[type0])
2310             {
2311               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2312                 {
2313                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2314                   return (error0);
2315                 }
2316             }
2317           else
2318             {
2319               /* Unrecognized mandatory option, check the two high order bits */
2320               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2321                 {
2322                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2323                   break;
2324                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2325                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2326                   *next0 = IP_LOOKUP_NEXT_DROP;
2327                   break;
2328                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2329                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2330                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2331                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2332                                                ICMP6_parameter_problem_unrecognized_option,
2333                                                (u8 *) opt0 - (u8 *) ip0);
2334                   break;
2335                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2336                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2337                   if (!ip6_address_is_multicast (&ip0->dst_address))
2338                     {
2339                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2340                       icmp6_error_set_vnet_buffer (b0,
2341                                                    ICMP6_parameter_problem,
2342                                                    ICMP6_parameter_problem_unrecognized_option,
2343                                                    (u8 *) opt0 - (u8 *) ip0);
2344                     }
2345                   else
2346                     {
2347                       *next0 = IP_LOOKUP_NEXT_DROP;
2348                     }
2349                   break;
2350                 }
2351               return (error0);
2352             }
2353         }
2354       opt0 =
2355         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2356                                      sizeof (ip6_hop_by_hop_option_t));
2357     }
2358   return (error0);
2359 }
2360
2361 /*
2362  * Process the Hop-by-Hop Options header
2363  */
2364 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2365                                     vlib_node_runtime_t * node,
2366                                     vlib_frame_t * frame)
2367 {
2368   vlib_node_runtime_t *error_node =
2369     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2370   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2371   u32 n_left_from, *from, *to_next;
2372   ip_lookup_next_t next_index;
2373
2374   from = vlib_frame_vector_args (frame);
2375   n_left_from = frame->n_vectors;
2376   next_index = node->cached_next_index;
2377
2378   while (n_left_from > 0)
2379     {
2380       u32 n_left_to_next;
2381
2382       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2383
2384       while (n_left_from >= 4 && n_left_to_next >= 2)
2385         {
2386           u32 bi0, bi1;
2387           vlib_buffer_t *b0, *b1;
2388           u32 next0, next1;
2389           ip6_header_t *ip0, *ip1;
2390           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2391           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2392           u8 error0 = 0, error1 = 0;
2393
2394           /* Prefetch next iteration. */
2395           {
2396             vlib_buffer_t *p2, *p3;
2397
2398             p2 = vlib_get_buffer (vm, from[2]);
2399             p3 = vlib_get_buffer (vm, from[3]);
2400
2401             vlib_prefetch_buffer_header (p2, LOAD);
2402             vlib_prefetch_buffer_header (p3, LOAD);
2403
2404             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2405             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2406           }
2407
2408           /* Speculatively enqueue b0, b1 to the current next frame */
2409           to_next[0] = bi0 = from[0];
2410           to_next[1] = bi1 = from[1];
2411           from += 2;
2412           to_next += 2;
2413           n_left_from -= 2;
2414           n_left_to_next -= 2;
2415
2416           b0 = vlib_get_buffer (vm, bi0);
2417           b1 = vlib_get_buffer (vm, bi1);
2418
2419           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2420           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2421           ip_adjacency_t *adj0 = adj_get (adj_index0);
2422           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2423           ip_adjacency_t *adj1 = adj_get (adj_index1);
2424
2425           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2426           next0 = adj0->lookup_next_index;
2427           next1 = adj1->lookup_next_index;
2428
2429           ip0 = vlib_buffer_get_current (b0);
2430           ip1 = vlib_buffer_get_current (b1);
2431           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2432           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2433           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2434           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2435           limit0 =
2436             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2437                                          ((hbh0->length + 1) << 3));
2438           limit1 =
2439             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2440                                          ((hbh1->length + 1) << 3));
2441
2442           /*
2443            * Basic validity checks
2444            */
2445           if ((hbh0->length + 1) << 3 >
2446               clib_net_to_host_u16 (ip0->payload_length))
2447             {
2448               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2449               next0 = IP_LOOKUP_NEXT_DROP;
2450               goto outdual;
2451             }
2452           /* Scan the set of h-b-h options, process ones that we understand */
2453           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2454
2455           if ((hbh1->length + 1) << 3 >
2456               clib_net_to_host_u16 (ip1->payload_length))
2457             {
2458               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2459               next1 = IP_LOOKUP_NEXT_DROP;
2460               goto outdual;
2461             }
2462           /* Scan the set of h-b-h options, process ones that we understand */
2463           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2464
2465         outdual:
2466           /* Has the classifier flagged this buffer for special treatment? */
2467           if (PREDICT_FALSE
2468               ((error0 == 0)
2469                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2470             next0 = hm->next_override;
2471
2472           /* Has the classifier flagged this buffer for special treatment? */
2473           if (PREDICT_FALSE
2474               ((error1 == 0)
2475                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2476             next1 = hm->next_override;
2477
2478           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2479             {
2480               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2481                 {
2482                   ip6_hop_by_hop_trace_t *t =
2483                     vlib_add_trace (vm, node, b0, sizeof (*t));
2484                   u32 trace_len = (hbh0->length + 1) << 3;
2485                   t->next_index = next0;
2486                   /* Capture the h-b-h option verbatim */
2487                   trace_len =
2488                     trace_len <
2489                     ARRAY_LEN (t->option_data) ? trace_len :
2490                     ARRAY_LEN (t->option_data);
2491                   t->trace_len = trace_len;
2492                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2493                 }
2494               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2495                 {
2496                   ip6_hop_by_hop_trace_t *t =
2497                     vlib_add_trace (vm, node, b1, sizeof (*t));
2498                   u32 trace_len = (hbh1->length + 1) << 3;
2499                   t->next_index = next1;
2500                   /* Capture the h-b-h option verbatim */
2501                   trace_len =
2502                     trace_len <
2503                     ARRAY_LEN (t->option_data) ? trace_len :
2504                     ARRAY_LEN (t->option_data);
2505                   t->trace_len = trace_len;
2506                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2507                 }
2508
2509             }
2510
2511           b0->error = error_node->errors[error0];
2512           b1->error = error_node->errors[error1];
2513
2514           /* verify speculative enqueue, maybe switch current next frame */
2515           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2516                                            n_left_to_next, bi0, bi1, next0,
2517                                            next1);
2518         }
2519
2520       while (n_left_from > 0 && n_left_to_next > 0)
2521         {
2522           u32 bi0;
2523           vlib_buffer_t *b0;
2524           u32 next0;
2525           ip6_header_t *ip0;
2526           ip6_hop_by_hop_header_t *hbh0;
2527           ip6_hop_by_hop_option_t *opt0, *limit0;
2528           u8 error0 = 0;
2529
2530           /* Speculatively enqueue b0 to the current next frame */
2531           bi0 = from[0];
2532           to_next[0] = bi0;
2533           from += 1;
2534           to_next += 1;
2535           n_left_from -= 1;
2536           n_left_to_next -= 1;
2537
2538           b0 = vlib_get_buffer (vm, bi0);
2539           /*
2540            * Default use the next_index from the adjacency.
2541            * A HBH option rarely redirects to a different node
2542            */
2543           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2544           ip_adjacency_t *adj0 = adj_get (adj_index0);
2545           next0 = adj0->lookup_next_index;
2546
2547           ip0 = vlib_buffer_get_current (b0);
2548           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2549           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2550           limit0 =
2551             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2552                                          ((hbh0->length + 1) << 3));
2553
2554           /*
2555            * Basic validity checks
2556            */
2557           if ((hbh0->length + 1) << 3 >
2558               clib_net_to_host_u16 (ip0->payload_length))
2559             {
2560               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2561               next0 = IP_LOOKUP_NEXT_DROP;
2562               goto out0;
2563             }
2564
2565           /* Scan the set of h-b-h options, process ones that we understand */
2566           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2567
2568         out0:
2569           /* Has the classifier flagged this buffer for special treatment? */
2570           if (PREDICT_FALSE
2571               ((error0 == 0)
2572                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2573             next0 = hm->next_override;
2574
2575           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2576             {
2577               ip6_hop_by_hop_trace_t *t =
2578                 vlib_add_trace (vm, node, b0, sizeof (*t));
2579               u32 trace_len = (hbh0->length + 1) << 3;
2580               t->next_index = next0;
2581               /* Capture the h-b-h option verbatim */
2582               trace_len =
2583                 trace_len <
2584                 ARRAY_LEN (t->option_data) ? trace_len :
2585                 ARRAY_LEN (t->option_data);
2586               t->trace_len = trace_len;
2587               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2588             }
2589
2590           b0->error = error_node->errors[error0];
2591
2592           /* verify speculative enqueue, maybe switch current next frame */
2593           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2594                                            n_left_to_next, bi0, next0);
2595         }
2596       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2597     }
2598   return frame->n_vectors;
2599 }
2600
2601 /* *INDENT-OFF* */
2602 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2603 {
2604   .name = "ip6-hop-by-hop",
2605   .sibling_of = "ip6-lookup",
2606   .vector_size = sizeof (u32),
2607   .format_trace = format_ip6_hop_by_hop_trace,
2608   .type = VLIB_NODE_TYPE_INTERNAL,
2609   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2610   .error_strings = ip6_hop_by_hop_error_strings,
2611   .n_next_nodes = 0,
2612 };
2613 /* *INDENT-ON* */
2614
2615 static clib_error_t *
2616 ip6_hop_by_hop_init (vlib_main_t * vm)
2617 {
2618   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2619   clib_memset (hm->options, 0, sizeof (hm->options));
2620   clib_memset (hm->trace, 0, sizeof (hm->trace));
2621   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2622   return (0);
2623 }
2624
2625 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2626
2627 #ifndef CLIB_MARCH_VARIANT
2628 void
2629 ip6_hbh_set_next_override (uword next)
2630 {
2631   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2632
2633   hm->next_override = next;
2634 }
2635
2636 int
2637 ip6_hbh_register_option (u8 option,
2638                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2639                                       ip6_hop_by_hop_option_t * opt),
2640                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2641 {
2642   ip6_main_t *im = &ip6_main;
2643   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2644
2645   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2646
2647   /* Already registered */
2648   if (hm->options[option])
2649     return (-1);
2650
2651   hm->options[option] = options;
2652   hm->trace[option] = trace;
2653
2654   /* Set global variable */
2655   im->hbh_enabled = 1;
2656
2657   return (0);
2658 }
2659
2660 int
2661 ip6_hbh_unregister_option (u8 option)
2662 {
2663   ip6_main_t *im = &ip6_main;
2664   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2665
2666   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2667
2668   /* Not registered */
2669   if (!hm->options[option])
2670     return (-1);
2671
2672   hm->options[option] = NULL;
2673   hm->trace[option] = NULL;
2674
2675   /* Disable global knob if this was the last option configured */
2676   int i;
2677   bool found = false;
2678   for (i = 0; i < 256; i++)
2679     {
2680       if (hm->options[option])
2681         {
2682           found = true;
2683           break;
2684         }
2685     }
2686   if (!found)
2687     im->hbh_enabled = 0;
2688
2689   return (0);
2690 }
2691
2692 /* Global IP6 main. */
2693 ip6_main_t ip6_main;
2694 #endif
2695
2696 static clib_error_t *
2697 ip6_lookup_init (vlib_main_t * vm)
2698 {
2699   ip6_main_t *im = &ip6_main;
2700   clib_error_t *error;
2701   uword i;
2702
2703   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2704     return error;
2705
2706   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2707     {
2708       u32 j, i0, i1;
2709
2710       i0 = i / 32;
2711       i1 = i % 32;
2712
2713       for (j = 0; j < i0; j++)
2714         im->fib_masks[i].as_u32[j] = ~0;
2715
2716       if (i1)
2717         im->fib_masks[i].as_u32[i0] =
2718           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2719     }
2720
2721   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2722
2723   if (im->lookup_table_nbuckets == 0)
2724     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2725
2726   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2727
2728   if (im->lookup_table_size == 0)
2729     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2730
2731   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2732                          "ip6 FIB fwding table",
2733                          im->lookup_table_nbuckets, im->lookup_table_size);
2734   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2735                          "ip6 FIB non-fwding table",
2736                          im->lookup_table_nbuckets, im->lookup_table_size);
2737   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2738                          "ip6 mFIB table",
2739                          im->lookup_table_nbuckets, im->lookup_table_size);
2740
2741   /* Create FIB with index 0 and table id of 0. */
2742   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2743                                      FIB_SOURCE_DEFAULT_ROUTE);
2744   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2745                                       MFIB_SOURCE_DEFAULT_ROUTE);
2746
2747   {
2748     pg_node_t *pn;
2749     pn = pg_get_node (ip6_lookup_node.index);
2750     pn->unformat_edit = unformat_pg_ip6_header;
2751   }
2752
2753   /* Unless explicitly configured, don't process HBH options */
2754   im->hbh_enabled = 0;
2755
2756   return error;
2757 }
2758
2759 VLIB_INIT_FUNCTION (ip6_lookup_init);
2760
2761 #ifndef CLIB_MARCH_VARIANT
2762 int
2763 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2764 {
2765   u32 fib_index;
2766
2767   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2768
2769   if (~0 == fib_index)
2770     return VNET_API_ERROR_NO_SUCH_FIB;
2771
2772   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2773                                   flow_hash_config);
2774
2775   return 0;
2776 }
2777 #endif
2778
2779 static clib_error_t *
2780 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2781                               unformat_input_t * input,
2782                               vlib_cli_command_t * cmd)
2783 {
2784   int matched = 0;
2785   u32 table_id = 0;
2786   u32 flow_hash_config = 0;
2787   int rv;
2788
2789   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2790     {
2791       if (unformat (input, "table %d", &table_id))
2792         matched = 1;
2793 #define _(a,v) \
2794     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2795       foreach_flow_hash_bit
2796 #undef _
2797         else
2798         break;
2799     }
2800
2801   if (matched == 0)
2802     return clib_error_return (0, "unknown input `%U'",
2803                               format_unformat_error, input);
2804
2805   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2806   switch (rv)
2807     {
2808     case 0:
2809       break;
2810
2811     case -1:
2812       return clib_error_return (0, "no such FIB table %d", table_id);
2813
2814     default:
2815       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2816       break;
2817     }
2818
2819   return 0;
2820 }
2821
2822 /*?
2823  * Configure the set of IPv6 fields used by the flow hash.
2824  *
2825  * @cliexpar
2826  * @parblock
2827  * Example of how to set the flow hash on a given table:
2828  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2829  *
2830  * Example of display the configured flow hash:
2831  * @cliexstart{show ip6 fib}
2832  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2833  * @::/0
2834  *   unicast-ip6-chain
2835  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2836  *     [0] [@0]: dpo-drop ip6
2837  * fe80::/10
2838  *   unicast-ip6-chain
2839  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2840  *     [0] [@2]: dpo-receive
2841  * ff02::1/128
2842  *   unicast-ip6-chain
2843  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2844  *     [0] [@2]: dpo-receive
2845  * ff02::2/128
2846  *   unicast-ip6-chain
2847  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2848  *     [0] [@2]: dpo-receive
2849  * ff02::16/128
2850  *   unicast-ip6-chain
2851  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2852  *     [0] [@2]: dpo-receive
2853  * ff02::1:ff00:0/104
2854  *   unicast-ip6-chain
2855  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2856  *     [0] [@2]: dpo-receive
2857  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2858  * @::/0
2859  *   unicast-ip6-chain
2860  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2861  *     [0] [@0]: dpo-drop ip6
2862  * @::a:1:1:0:4/126
2863  *   unicast-ip6-chain
2864  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2865  *     [0] [@4]: ipv6-glean: af_packet0
2866  * @::a:1:1:0:7/128
2867  *   unicast-ip6-chain
2868  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2869  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2870  * fe80::/10
2871  *   unicast-ip6-chain
2872  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2873  *     [0] [@2]: dpo-receive
2874  * fe80::fe:3eff:fe3e:9222/128
2875  *   unicast-ip6-chain
2876  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2877  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2878  * ff02::1/128
2879  *   unicast-ip6-chain
2880  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2881  *     [0] [@2]: dpo-receive
2882  * ff02::2/128
2883  *   unicast-ip6-chain
2884  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2885  *     [0] [@2]: dpo-receive
2886  * ff02::16/128
2887  *   unicast-ip6-chain
2888  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2889  *     [0] [@2]: dpo-receive
2890  * ff02::1:ff00:0/104
2891  *   unicast-ip6-chain
2892  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2893  *     [0] [@2]: dpo-receive
2894  * @cliexend
2895  * @endparblock
2896 ?*/
2897 /* *INDENT-OFF* */
2898 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2899 {
2900   .path = "set ip6 flow-hash",
2901   .short_help =
2902   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2903   .function = set_ip6_flow_hash_command_fn,
2904 };
2905 /* *INDENT-ON* */
2906
2907 static clib_error_t *
2908 show_ip6_local_command_fn (vlib_main_t * vm,
2909                            unformat_input_t * input, vlib_cli_command_t * cmd)
2910 {
2911   ip6_main_t *im = &ip6_main;
2912   ip_lookup_main_t *lm = &im->lookup_main;
2913   int i;
2914
2915   vlib_cli_output (vm, "Protocols handled by ip6_local");
2916   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2917     {
2918       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2919         {
2920
2921           u32 node_index = vlib_get_node (vm,
2922                                           ip6_local_node.index)->
2923             next_nodes[lm->local_next_by_ip_protocol[i]];
2924           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2925                            node_index);
2926         }
2927     }
2928   return 0;
2929 }
2930
2931
2932
2933 /*?
2934  * Display the set of protocols handled by the local IPv6 stack.
2935  *
2936  * @cliexpar
2937  * Example of how to display local protocol table:
2938  * @cliexstart{show ip6 local}
2939  * Protocols handled by ip6_local
2940  * 17
2941  * 43
2942  * 58
2943  * 115
2944  * @cliexend
2945 ?*/
2946 /* *INDENT-OFF* */
2947 VLIB_CLI_COMMAND (show_ip6_local, static) =
2948 {
2949   .path = "show ip6 local",
2950   .function = show_ip6_local_command_fn,
2951   .short_help = "show ip6 local",
2952 };
2953 /* *INDENT-ON* */
2954
2955 #ifndef CLIB_MARCH_VARIANT
2956 int
2957 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2958                              u32 table_index)
2959 {
2960   vnet_main_t *vnm = vnet_get_main ();
2961   vnet_interface_main_t *im = &vnm->interface_main;
2962   ip6_main_t *ipm = &ip6_main;
2963   ip_lookup_main_t *lm = &ipm->lookup_main;
2964   vnet_classify_main_t *cm = &vnet_classify_main;
2965   ip6_address_t *if_addr;
2966
2967   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2968     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2969
2970   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2971     return VNET_API_ERROR_NO_SUCH_ENTRY;
2972
2973   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2974   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2975
2976   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2977
2978   if (NULL != if_addr)
2979     {
2980       fib_prefix_t pfx = {
2981         .fp_len = 128,
2982         .fp_proto = FIB_PROTOCOL_IP6,
2983         .fp_addr.ip6 = *if_addr,
2984       };
2985       u32 fib_index;
2986
2987       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2988                                                        sw_if_index);
2989
2990
2991       if (table_index != (u32) ~ 0)
2992         {
2993           dpo_id_t dpo = DPO_INVALID;
2994
2995           dpo_set (&dpo,
2996                    DPO_CLASSIFY,
2997                    DPO_PROTO_IP6,
2998                    classify_dpo_create (DPO_PROTO_IP6, table_index));
2999
3000           fib_table_entry_special_dpo_add (fib_index,
3001                                            &pfx,
3002                                            FIB_SOURCE_CLASSIFY,
3003                                            FIB_ENTRY_FLAG_NONE, &dpo);
3004           dpo_reset (&dpo);
3005         }
3006       else
3007         {
3008           fib_table_entry_special_remove (fib_index,
3009                                           &pfx, FIB_SOURCE_CLASSIFY);
3010         }
3011     }
3012
3013   return 0;
3014 }
3015 #endif
3016
3017 static clib_error_t *
3018 set_ip6_classify_command_fn (vlib_main_t * vm,
3019                              unformat_input_t * input,
3020                              vlib_cli_command_t * cmd)
3021 {
3022   u32 table_index = ~0;
3023   int table_index_set = 0;
3024   u32 sw_if_index = ~0;
3025   int rv;
3026
3027   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3028     {
3029       if (unformat (input, "table-index %d", &table_index))
3030         table_index_set = 1;
3031       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3032                          vnet_get_main (), &sw_if_index))
3033         ;
3034       else
3035         break;
3036     }
3037
3038   if (table_index_set == 0)
3039     return clib_error_return (0, "classify table-index must be specified");
3040
3041   if (sw_if_index == ~0)
3042     return clib_error_return (0, "interface / subif must be specified");
3043
3044   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3045
3046   switch (rv)
3047     {
3048     case 0:
3049       break;
3050
3051     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3052       return clib_error_return (0, "No such interface");
3053
3054     case VNET_API_ERROR_NO_SUCH_ENTRY:
3055       return clib_error_return (0, "No such classifier table");
3056     }
3057   return 0;
3058 }
3059
3060 /*?
3061  * Assign a classification table to an interface. The classification
3062  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3063  * commands. Once the table is create, use this command to filter packets
3064  * on an interface.
3065  *
3066  * @cliexpar
3067  * Example of how to assign a classification table to an interface:
3068  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3069 ?*/
3070 /* *INDENT-OFF* */
3071 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3072 {
3073   .path = "set ip6 classify",
3074   .short_help =
3075   "set ip6 classify intfc <interface> table-index <classify-idx>",
3076   .function = set_ip6_classify_command_fn,
3077 };
3078 /* *INDENT-ON* */
3079
3080 static clib_error_t *
3081 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3082 {
3083   ip6_main_t *im = &ip6_main;
3084   uword heapsize = 0;
3085   u32 tmp;
3086   u32 nbuckets = 0;
3087
3088   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3089     {
3090       if (unformat (input, "hash-buckets %d", &tmp))
3091         nbuckets = tmp;
3092       else if (unformat (input, "heap-size %U",
3093                          unformat_memory_size, &heapsize))
3094         ;
3095       else
3096         return clib_error_return (0, "unknown input '%U'",
3097                                   format_unformat_error, input);
3098     }
3099
3100   im->lookup_table_nbuckets = nbuckets;
3101   im->lookup_table_size = heapsize;
3102
3103   return 0;
3104 }
3105
3106 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3107
3108 /*
3109  * fd.io coding-style-patch-verification: ON
3110  *
3111  * Local Variables:
3112  * eval: (c-set-style "gnu")
3113  * End:
3114  */