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 = 0;
1025   u16 payload_length, payload_length_host_byte_order;
1026   u32 i;
1027   u32 headers_size = sizeof (ip0[0]);
1028   u8 *data_this_buffer;
1029   u8 next_hdr = ip0->protocol;
1030
1031   ASSERT (bogus_lengthp);
1032   *bogus_lengthp = 0;
1033
1034   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1035   data_this_buffer = (u8 *) (ip0 + 1);
1036   payload_length = ip0->payload_length;
1037
1038   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1039    * or UDP-Ping packets */
1040   if (PREDICT_FALSE (next_hdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1041     {
1042       u32 skip_bytes;
1043       ip6_hop_by_hop_ext_t *ext_hdr =
1044         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1045
1046       /* validate really icmp6 next */
1047       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1048               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1049
1050       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1051       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1052
1053       payload_length_host_byte_order -= skip_bytes;
1054       headers_size += skip_bytes;
1055
1056       /* pseudo-header adjustments:
1057        *   exclude ext header bytes from payload length
1058        *   use payload IP proto rather than ext header IP proto
1059        */
1060       payload_length = clib_host_to_net_u16 (payload_length_host_byte_order);
1061       next_hdr = ext_hdr->next_hdr;
1062     }
1063
1064   /* Initialize checksum with ip pseudo-header. */
1065   sum0 = payload_length + clib_host_to_net_u16 (next_hdr);
1066
1067   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1068     {
1069       sum0 = ip_csum_with_carry
1070         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1071       sum0 = ip_csum_with_carry
1072         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1073     }
1074
1075   if (p0)
1076     return ip_calculate_l4_checksum (vm, p0, sum0,
1077                                      payload_length_host_byte_order,
1078                                      (u8 *) ip0, headers_size, NULL);
1079   else
1080     return ip_calculate_l4_checksum (vm, 0, sum0,
1081                                      payload_length_host_byte_order, NULL, 0,
1082                                      data_this_buffer);
1083 }
1084
1085 u32
1086 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1087 {
1088   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1089   udp_header_t *udp0;
1090   u16 sum16;
1091   int bogus_length;
1092
1093   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1094   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1095           || ip0->protocol == IP_PROTOCOL_ICMP6
1096           || ip0->protocol == IP_PROTOCOL_UDP
1097           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1098
1099   udp0 = (void *) (ip0 + 1);
1100   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1101     {
1102       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1103                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1104       return p0->flags;
1105     }
1106
1107   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1108
1109   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1110                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1111
1112   return p0->flags;
1113 }
1114 #endif
1115
1116 /**
1117  * @brief returns number of links on which src is reachable.
1118  */
1119 always_inline int
1120 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1121 {
1122   const load_balance_t *lb0;
1123   index_t lbi;
1124   u32 fib_index;
1125
1126   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1127                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1128   fib_index =
1129     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1130     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1131
1132   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1133   lb0 = load_balance_get (lbi);
1134
1135   return (fib_urpf_check_size (lb0->lb_urpf));
1136 }
1137
1138 always_inline u8
1139 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1140                            u32 * udp_offset0)
1141 {
1142   u32 proto0;
1143   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1144   if (proto0 != IP_PROTOCOL_UDP)
1145     {
1146       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1147       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1148     }
1149   return proto0;
1150 }
1151
1152 /* *INDENT-OFF* */
1153 VNET_FEATURE_ARC_INIT (ip6_local) =
1154 {
1155   .arc_name  = "ip6-local",
1156   .start_nodes = VNET_FEATURES ("ip6-local"),
1157 };
1158 /* *INDENT-ON* */
1159
1160 static_always_inline u8
1161 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1162 {
1163
1164   u16 payload_length_host_byte_order;
1165   u32 n_this_buffer, n_bytes_left;
1166   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1167   u32 headers_size = sizeof (ip0[0]);
1168   u8 *data_this_buffer;
1169
1170
1171   data_this_buffer = (u8 *) (ip0 + 1);
1172
1173   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1174
1175   /* validate really icmp6 next */
1176
1177   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1178       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1179     return 0;
1180
1181
1182   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1183   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1184
1185
1186   u32 n_ip_bytes_this_buffer =
1187     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1188   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1189     {
1190       n_this_buffer = p0->current_length > headers_size ?
1191         n_ip_bytes_this_buffer - headers_size : 0;
1192     }
1193
1194   n_bytes_left -= n_this_buffer;
1195   n_bytes_left -= p0->total_length_not_including_first_buffer;
1196
1197   if (n_bytes_left == 0)
1198     return 0;
1199   else
1200     return 1;
1201 }
1202
1203
1204 always_inline uword
1205 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1206                   vlib_frame_t * frame, int head_of_feature_arc)
1207 {
1208   ip6_main_t *im = &ip6_main;
1209   ip_lookup_main_t *lm = &im->lookup_main;
1210   u32 *from, n_left_from;
1211   vlib_node_runtime_t *error_node =
1212     vlib_node_get_runtime (vm, ip6_input_node.index);
1213   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1214   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1215   u16 nexts[VLIB_FRAME_SIZE], *next;
1216
1217   from = vlib_frame_vector_args (frame);
1218   n_left_from = frame->n_vectors;
1219
1220   if (node->flags & VLIB_NODE_FLAG_TRACE)
1221     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1222
1223   vlib_get_buffers (vm, from, bufs, n_left_from);
1224   b = bufs;
1225   next = nexts;
1226
1227   while (n_left_from > 2)
1228     {
1229       /* Prefetch next iteration. */
1230       if (n_left_from >= 6)
1231         {
1232           vlib_prefetch_buffer_header (b[4], STORE);
1233           vlib_prefetch_buffer_header (b[5], STORE);
1234           vlib_prefetch_buffer_data (b[2], LOAD);
1235           vlib_prefetch_buffer_data (b[3], LOAD);
1236         }
1237
1238       u8 error[2];
1239       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1240       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1241
1242       ip6_header_t *ip[2];
1243       ip[0] = vlib_buffer_get_current (b[0]);
1244       ip[1] = vlib_buffer_get_current (b[1]);
1245
1246       if (head_of_feature_arc)
1247         {
1248           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1249           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1250
1251           u8 type[2];
1252           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1253           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1254
1255           u32 flags[2];
1256           flags[0] = b[0]->flags;
1257           flags[1] = b[1]->flags;
1258
1259           u32 good_l4_csum[2];
1260           good_l4_csum[0] =
1261             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1262                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1263                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1264           good_l4_csum[1] =
1265             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1266                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1267                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1268
1269           u32 udp_offset[2] = { };
1270           u8 is_tcp_udp[2];
1271           is_tcp_udp[0] =
1272             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1273           is_tcp_udp[1] =
1274             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1275           i16 len_diff[2] = { 0 };
1276           if (PREDICT_TRUE (is_tcp_udp[0]))
1277             {
1278               udp_header_t *udp =
1279                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1280               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1281                 && udp->checksum == 0;
1282               /* optimistically verify UDP length. */
1283               u16 ip_len, udp_len;
1284               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1285               udp_len = clib_net_to_host_u16 (udp->length);
1286               len_diff[0] = ip_len - udp_len;
1287             }
1288           if (PREDICT_TRUE (is_tcp_udp[1]))
1289             {
1290               udp_header_t *udp =
1291                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1292               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1293                 && udp->checksum == 0;
1294               /* optimistically verify UDP length. */
1295               u16 ip_len, udp_len;
1296               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1297               udp_len = clib_net_to_host_u16 (udp->length);
1298               len_diff[1] = ip_len - udp_len;
1299             }
1300
1301           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1302           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1303
1304           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1305           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1306
1307           u8 need_csum[2];
1308           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1309             && !good_l4_csum[0]
1310             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1311           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1312             && !good_l4_csum[1]
1313             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1314           if (PREDICT_FALSE (need_csum[0]))
1315             {
1316               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1317               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1318               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1319             }
1320           else
1321             {
1322               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1323                 error[0] = IP6_ERROR_BAD_LENGTH;
1324             }
1325           if (PREDICT_FALSE (need_csum[1]))
1326             {
1327               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1328               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1329               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1330             }
1331           else
1332             {
1333               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1334                 error[1] = IP6_ERROR_BAD_LENGTH;
1335             }
1336
1337
1338           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1339
1340           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1341
1342           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1343                          IP6_ERROR_UDP_CHECKSUM,
1344                          "Wrong IP6 errors constants");
1345           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1346                          IP6_ERROR_ICMP_CHECKSUM,
1347                          "Wrong IP6 errors constants");
1348
1349           error[0] =
1350             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1351           error[1] =
1352             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1353
1354           /* Drop packets from unroutable hosts. */
1355           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1356           u8 unroutable[2];
1357           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1358             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1359             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1360           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1361             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1362             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1363           if (PREDICT_FALSE (unroutable[0]))
1364             {
1365               error[0] =
1366                 !ip6_urpf_loose_check (im, b[0],
1367                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1368                 : error[0];
1369             }
1370           if (PREDICT_FALSE (unroutable[1]))
1371             {
1372               error[1] =
1373                 !ip6_urpf_loose_check (im, b[1],
1374                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1375                 : error[1];
1376             }
1377
1378           vnet_buffer (b[0])->ip.fib_index =
1379             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1380             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1381             vnet_buffer (b[0])->ip.fib_index;
1382           vnet_buffer (b[1])->ip.fib_index =
1383             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1384             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1385             vnet_buffer (b[1])->ip.fib_index;
1386         }                       /* head_of_feature_arc */
1387
1388       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1389       next[0] =
1390         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1391       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1392       next[1] =
1393         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1394
1395       b[0]->error = error_node->errors[0];
1396       b[1]->error = error_node->errors[1];
1397
1398       if (head_of_feature_arc)
1399         {
1400           u8 ip6_unknown[2];
1401           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1402           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1403           if (PREDICT_TRUE (ip6_unknown[0]))
1404             {
1405               u32 next32 = next[0];
1406               vnet_feature_arc_start (arc_index,
1407                                       vnet_buffer (b[0])->sw_if_index
1408                                       [VLIB_RX], &next32, b[0]);
1409               next[0] = next32;
1410             }
1411           if (PREDICT_TRUE (ip6_unknown[1]))
1412             {
1413               u32 next32 = next[1];
1414               vnet_feature_arc_start (arc_index,
1415                                       vnet_buffer (b[1])->sw_if_index
1416                                       [VLIB_RX], &next32, b[1]);
1417               next[1] = next32;
1418             }
1419         }
1420
1421       /* next */
1422       b += 2;
1423       next += 2;
1424       n_left_from -= 2;
1425     }
1426
1427   while (n_left_from)
1428     {
1429       u8 error;
1430       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1431
1432       ip6_header_t *ip;
1433       ip = vlib_buffer_get_current (b[0]);
1434
1435       if (head_of_feature_arc)
1436         {
1437           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1438           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1439
1440           u32 flags = b[0]->flags;
1441           u32 good_l4_csum =
1442             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1443                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1444                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1445
1446           u32 udp_offset;
1447           i16 len_diff = 0;
1448           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1449           if (PREDICT_TRUE (is_tcp_udp))
1450             {
1451               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1452               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1453               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1454                 && udp->checksum == 0;
1455               /* optimistically verify UDP length. */
1456               u16 ip_len, udp_len;
1457               ip_len = clib_net_to_host_u16 (ip->payload_length);
1458               udp_len = clib_net_to_host_u16 (udp->length);
1459               len_diff = ip_len - udp_len;
1460             }
1461
1462           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1463           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1464
1465           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1466             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1467           if (PREDICT_FALSE (need_csum))
1468             {
1469               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1470               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1471               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1472             }
1473           else
1474             {
1475               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1476                 error = IP6_ERROR_BAD_LENGTH;
1477             }
1478
1479
1480
1481           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1482
1483           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1484                          IP6_ERROR_UDP_CHECKSUM,
1485                          "Wrong IP6 errors constants");
1486           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1487                          IP6_ERROR_ICMP_CHECKSUM,
1488                          "Wrong IP6 errors constants");
1489
1490           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1491
1492           /* Drop packets from unroutable hosts. */
1493           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1494           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1495             && type != IP_BUILTIN_PROTOCOL_ICMP
1496             && !ip6_address_is_link_local_unicast (&ip->src_address);
1497           if (PREDICT_FALSE (unroutable))
1498             {
1499               error =
1500                 !ip6_urpf_loose_check (im, b[0],
1501                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1502                 error;
1503             }
1504
1505           vnet_buffer (b[0])->ip.fib_index =
1506             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1507             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1508             vnet_buffer (b[0])->ip.fib_index;
1509         }                       /* head_of_feature_arc */
1510
1511       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1512       next[0] =
1513         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1514
1515       b[0]->error = error_node->errors[0];
1516
1517       if (head_of_feature_arc)
1518         {
1519           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1520             {
1521               u32 next32 = next[0];
1522               vnet_feature_arc_start (arc_index,
1523                                       vnet_buffer (b[0])->sw_if_index
1524                                       [VLIB_RX], &next32, b[0]);
1525               next[0] = next32;
1526             }
1527         }
1528
1529       /* next */
1530       b += 1;
1531       next += 1;
1532       n_left_from -= 1;
1533     }
1534
1535   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1536   return frame->n_vectors;
1537 }
1538
1539 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1540                                vlib_frame_t * frame)
1541 {
1542   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1543 }
1544
1545 /* *INDENT-OFF* */
1546 VLIB_REGISTER_NODE (ip6_local_node) =
1547 {
1548   .name = "ip6-local",
1549   .vector_size = sizeof (u32),
1550   .format_trace = format_ip6_forward_next_trace,
1551   .n_next_nodes = IP_LOCAL_N_NEXT,
1552   .next_nodes =
1553   {
1554     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1555     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1556     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1557     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1558     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1559   },
1560 };
1561 /* *INDENT-ON* */
1562
1563 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1564                                           vlib_node_runtime_t * node,
1565                                           vlib_frame_t * frame)
1566 {
1567   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1568 }
1569
1570 /* *INDENT-OFF* */
1571 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1572   .name = "ip6-local-end-of-arc",
1573   .vector_size = sizeof (u32),
1574
1575   .format_trace = format_ip6_forward_next_trace,
1576   .sibling_of = "ip6-local",
1577 };
1578
1579 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1580   .arc_name = "ip6-local",
1581   .node_name = "ip6-local-end-of-arc",
1582   .runs_before = 0, /* not before any other features */
1583 };
1584 /* *INDENT-ON* */
1585
1586 #ifdef CLIB_MARCH_VARIANT
1587 extern vlib_node_registration_t ip6_local_node;
1588 #else
1589 void
1590 ip6_register_protocol (u32 protocol, u32 node_index)
1591 {
1592   vlib_main_t *vm = vlib_get_main ();
1593   ip6_main_t *im = &ip6_main;
1594   ip_lookup_main_t *lm = &im->lookup_main;
1595
1596   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1597   lm->local_next_by_ip_protocol[protocol] =
1598     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1599 }
1600
1601 void
1602 ip6_unregister_protocol (u32 protocol)
1603 {
1604   ip6_main_t *im = &ip6_main;
1605   ip_lookup_main_t *lm = &im->lookup_main;
1606
1607   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1608   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1609 }
1610 #endif
1611
1612 typedef enum
1613 {
1614   IP6_REWRITE_NEXT_DROP,
1615   IP6_REWRITE_NEXT_ICMP_ERROR,
1616   IP6_REWRITE_NEXT_FRAGMENT,
1617   IP6_REWRITE_N_NEXT            /* Last */
1618 } ip6_rewrite_next_t;
1619
1620 /**
1621  * This bits of an IPv6 address to mask to construct a multicast
1622  * MAC address
1623  */
1624 #define IP6_MCAST_ADDR_MASK 0xffffffff
1625
1626 always_inline void
1627 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1628                u16 adj_packet_bytes, bool is_locally_generated,
1629                u32 * next, u8 is_midchain, u32 * error)
1630 {
1631   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1632     {
1633       if (is_locally_generated)
1634         {
1635           /* IP fragmentation */
1636           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1637                                    (is_midchain ?
1638                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1639                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1640           *next = IP6_REWRITE_NEXT_FRAGMENT;
1641           *error = IP6_ERROR_MTU_EXCEEDED;
1642         }
1643       else
1644         {
1645           *error = IP6_ERROR_MTU_EXCEEDED;
1646           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1647                                        adj_packet_bytes);
1648           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1649         }
1650     }
1651 }
1652
1653 always_inline uword
1654 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1655                              vlib_node_runtime_t * node,
1656                              vlib_frame_t * frame,
1657                              int do_counters, int is_midchain, int is_mcast)
1658 {
1659   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1660   u32 *from = vlib_frame_vector_args (frame);
1661   u32 n_left_from, n_left_to_next, *to_next, next_index;
1662   vlib_node_runtime_t *error_node =
1663     vlib_node_get_runtime (vm, ip6_input_node.index);
1664
1665   n_left_from = frame->n_vectors;
1666   next_index = node->cached_next_index;
1667   u32 thread_index = vm->thread_index;
1668
1669   while (n_left_from > 0)
1670     {
1671       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1672
1673       while (n_left_from >= 4 && n_left_to_next >= 2)
1674         {
1675           const ip_adjacency_t *adj0, *adj1;
1676           vlib_buffer_t *p0, *p1;
1677           ip6_header_t *ip0, *ip1;
1678           u32 pi0, rw_len0, next0, error0, adj_index0;
1679           u32 pi1, rw_len1, next1, error1, adj_index1;
1680           u32 tx_sw_if_index0, tx_sw_if_index1;
1681           bool is_locally_originated0, is_locally_originated1;
1682
1683           /* Prefetch next iteration. */
1684           {
1685             vlib_buffer_t *p2, *p3;
1686
1687             p2 = vlib_get_buffer (vm, from[2]);
1688             p3 = vlib_get_buffer (vm, from[3]);
1689
1690             vlib_prefetch_buffer_header (p2, LOAD);
1691             vlib_prefetch_buffer_header (p3, LOAD);
1692
1693             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1694             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1695
1696             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1697             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1698           }
1699
1700           pi0 = to_next[0] = from[0];
1701           pi1 = to_next[1] = from[1];
1702
1703           from += 2;
1704           n_left_from -= 2;
1705           to_next += 2;
1706           n_left_to_next -= 2;
1707
1708           p0 = vlib_get_buffer (vm, pi0);
1709           p1 = vlib_get_buffer (vm, pi1);
1710
1711           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1712           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1713
1714           ip0 = vlib_buffer_get_current (p0);
1715           ip1 = vlib_buffer_get_current (p1);
1716
1717           error0 = error1 = IP6_ERROR_NONE;
1718           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1719
1720           is_locally_originated0 =
1721             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1722           if (PREDICT_TRUE (!is_locally_originated0))
1723             {
1724               i32 hop_limit0 = ip0->hop_limit;
1725
1726               /* Input node should have reject packets with hop limit 0. */
1727               ASSERT (ip0->hop_limit > 0);
1728
1729               hop_limit0 -= 1;
1730
1731               ip0->hop_limit = hop_limit0;
1732
1733               /*
1734                * If the hop count drops below 1 when forwarding, generate
1735                * an ICMP response.
1736                */
1737               if (PREDICT_FALSE (hop_limit0 <= 0))
1738                 {
1739                   error0 = IP6_ERROR_TIME_EXPIRED;
1740                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1741                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1742                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1743                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1744                                                0);
1745                 }
1746             }
1747
1748           is_locally_originated1 =
1749             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1750           if (PREDICT_TRUE (!is_locally_originated1))
1751             {
1752               i32 hop_limit1 = ip1->hop_limit;
1753
1754               /* Input node should have reject packets with hop limit 0. */
1755               ASSERT (ip1->hop_limit > 0);
1756
1757               hop_limit1 -= 1;
1758
1759               ip1->hop_limit = hop_limit1;
1760
1761               /*
1762                * If the hop count drops below 1 when forwarding, generate
1763                * an ICMP response.
1764                */
1765               if (PREDICT_FALSE (hop_limit1 <= 0))
1766                 {
1767                   error1 = IP6_ERROR_TIME_EXPIRED;
1768                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1769                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1770                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1771                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1772                                                0);
1773                 }
1774             }
1775
1776           adj0 = adj_get (adj_index0);
1777           adj1 = adj_get (adj_index1);
1778
1779           rw_len0 = adj0[0].rewrite_header.data_bytes;
1780           rw_len1 = adj1[0].rewrite_header.data_bytes;
1781           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1782           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1783
1784           if (do_counters)
1785             {
1786               vlib_increment_combined_counter
1787                 (&adjacency_counters,
1788                  thread_index, adj_index0, 1,
1789                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1790               vlib_increment_combined_counter
1791                 (&adjacency_counters,
1792                  thread_index, adj_index1, 1,
1793                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1794             }
1795
1796           /* Check MTU of outgoing interface. */
1797           u16 ip0_len =
1798             clib_net_to_host_u16 (ip0->payload_length) +
1799             sizeof (ip6_header_t);
1800           u16 ip1_len =
1801             clib_net_to_host_u16 (ip1->payload_length) +
1802             sizeof (ip6_header_t);
1803           if (p0->flags & VNET_BUFFER_F_GSO)
1804             ip0_len = gso_mtu_sz (p0);
1805           if (p1->flags & VNET_BUFFER_F_GSO)
1806             ip1_len = gso_mtu_sz (p1);
1807
1808
1809
1810           ip6_mtu_check (p0, ip0_len,
1811                          adj0[0].rewrite_header.max_l3_packet_bytes,
1812                          is_locally_originated0, &next0, is_midchain,
1813                          &error0);
1814           ip6_mtu_check (p1, ip1_len,
1815                          adj1[0].rewrite_header.max_l3_packet_bytes,
1816                          is_locally_originated1, &next1, is_midchain,
1817                          &error1);
1818
1819           /* Don't adjust the buffer for hop count issue; icmp-error node
1820            * wants to see the IP header */
1821           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1822             {
1823               p0->current_data -= rw_len0;
1824               p0->current_length += rw_len0;
1825
1826               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1827               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1828               next0 = adj0[0].rewrite_header.next_index;
1829
1830               if (PREDICT_FALSE
1831                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1832                 vnet_feature_arc_start (lm->output_feature_arc_index,
1833                                         tx_sw_if_index0, &next0, p0);
1834             }
1835           else
1836             {
1837               p0->error = error_node->errors[error0];
1838             }
1839           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1840             {
1841               p1->current_data -= rw_len1;
1842               p1->current_length += rw_len1;
1843
1844               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1845               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1846               next1 = adj1[0].rewrite_header.next_index;
1847
1848               if (PREDICT_FALSE
1849                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1850                 vnet_feature_arc_start (lm->output_feature_arc_index,
1851                                         tx_sw_if_index1, &next1, p1);
1852             }
1853           else
1854             {
1855               p1->error = error_node->errors[error1];
1856             }
1857
1858           if (is_midchain)
1859             {
1860               /* before we paint on the next header, update the L4
1861                * checksums if required, since there's no offload on a tunnel */
1862               calc_checksums (vm, p0);
1863               calc_checksums (vm, p1);
1864             }
1865
1866           /* Guess we are only writing on simple Ethernet header. */
1867           vnet_rewrite_two_headers (adj0[0], adj1[0],
1868                                     ip0, ip1, sizeof (ethernet_header_t));
1869
1870           if (is_midchain)
1871             {
1872               if (adj0->sub_type.midchain.fixup_func)
1873                 adj0->sub_type.midchain.fixup_func
1874                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1875               if (adj1->sub_type.midchain.fixup_func)
1876                 adj1->sub_type.midchain.fixup_func
1877                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1878             }
1879           if (is_mcast)
1880             {
1881               /*
1882                * copy bytes from the IP address into the MAC rewrite
1883                */
1884               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1885                                           adj0->
1886                                           rewrite_header.dst_mcast_offset,
1887                                           &ip0->dst_address.as_u32[3],
1888                                           (u8 *) ip0);
1889               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1890                                           adj1->
1891                                           rewrite_header.dst_mcast_offset,
1892                                           &ip1->dst_address.as_u32[3],
1893                                           (u8 *) ip1);
1894             }
1895
1896           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1897                                            to_next, n_left_to_next,
1898                                            pi0, pi1, next0, next1);
1899         }
1900
1901       while (n_left_from > 0 && n_left_to_next > 0)
1902         {
1903           ip_adjacency_t *adj0;
1904           vlib_buffer_t *p0;
1905           ip6_header_t *ip0;
1906           u32 pi0, rw_len0;
1907           u32 adj_index0, next0, error0;
1908           u32 tx_sw_if_index0;
1909           bool is_locally_originated0;
1910
1911           pi0 = to_next[0] = from[0];
1912
1913           p0 = vlib_get_buffer (vm, pi0);
1914
1915           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1916
1917           adj0 = adj_get (adj_index0);
1918
1919           ip0 = vlib_buffer_get_current (p0);
1920
1921           error0 = IP6_ERROR_NONE;
1922           next0 = IP6_REWRITE_NEXT_DROP;
1923
1924           /* Check hop limit */
1925           is_locally_originated0 =
1926             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1927           if (PREDICT_TRUE (!is_locally_originated0))
1928             {
1929               i32 hop_limit0 = ip0->hop_limit;
1930
1931               ASSERT (ip0->hop_limit > 0);
1932
1933               hop_limit0 -= 1;
1934
1935               ip0->hop_limit = hop_limit0;
1936
1937               if (PREDICT_FALSE (hop_limit0 <= 0))
1938                 {
1939                   /*
1940                    * If the hop count drops below 1 when forwarding, generate
1941                    * an ICMP response.
1942                    */
1943                   error0 = IP6_ERROR_TIME_EXPIRED;
1944                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1945                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1946                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1947                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1948                                                0);
1949                 }
1950             }
1951           else
1952             {
1953               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1954             }
1955
1956           if (is_midchain)
1957             {
1958               calc_checksums (vm, p0);
1959             }
1960
1961           /* Guess we are only writing on simple Ethernet header. */
1962           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1963
1964           /* Update packet buffer attributes/set output interface. */
1965           rw_len0 = adj0[0].rewrite_header.data_bytes;
1966           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1967
1968           if (do_counters)
1969             {
1970               vlib_increment_combined_counter
1971                 (&adjacency_counters,
1972                  thread_index, adj_index0, 1,
1973                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1974             }
1975
1976           /* Check MTU of outgoing interface. */
1977           u16 ip0_len =
1978             clib_net_to_host_u16 (ip0->payload_length) +
1979             sizeof (ip6_header_t);
1980           if (p0->flags & VNET_BUFFER_F_GSO)
1981             ip0_len = gso_mtu_sz (p0);
1982
1983           ip6_mtu_check (p0, ip0_len,
1984                          adj0[0].rewrite_header.max_l3_packet_bytes,
1985                          is_locally_originated0, &next0, is_midchain,
1986                          &error0);
1987
1988           /* Don't adjust the buffer for hop count issue; icmp-error node
1989            * wants to see the IP header */
1990           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1991             {
1992               p0->current_data -= rw_len0;
1993               p0->current_length += rw_len0;
1994
1995               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1996
1997               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1998               next0 = adj0[0].rewrite_header.next_index;
1999
2000               if (PREDICT_FALSE
2001                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2002                 vnet_feature_arc_start (lm->output_feature_arc_index,
2003                                         tx_sw_if_index0, &next0, p0);
2004             }
2005           else
2006             {
2007               p0->error = error_node->errors[error0];
2008             }
2009
2010           if (is_midchain)
2011             {
2012               if (adj0->sub_type.midchain.fixup_func)
2013                 adj0->sub_type.midchain.fixup_func
2014                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2015             }
2016           if (is_mcast)
2017             {
2018               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2019                                           adj0->
2020                                           rewrite_header.dst_mcast_offset,
2021                                           &ip0->dst_address.as_u32[3],
2022                                           (u8 *) ip0);
2023             }
2024
2025           from += 1;
2026           n_left_from -= 1;
2027           to_next += 1;
2028           n_left_to_next -= 1;
2029
2030           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2031                                            to_next, n_left_to_next,
2032                                            pi0, next0);
2033         }
2034
2035       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2036     }
2037
2038   /* Need to do trace after rewrites to pick up new packet data. */
2039   if (node->flags & VLIB_NODE_FLAG_TRACE)
2040     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2041
2042   return frame->n_vectors;
2043 }
2044
2045 always_inline uword
2046 ip6_rewrite_inline (vlib_main_t * vm,
2047                     vlib_node_runtime_t * node,
2048                     vlib_frame_t * frame,
2049                     int do_counters, int is_midchain, int is_mcast)
2050 {
2051   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2052                                       is_midchain, is_mcast);
2053 }
2054
2055 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2056                                  vlib_node_runtime_t * node,
2057                                  vlib_frame_t * frame)
2058 {
2059   if (adj_are_counters_enabled ())
2060     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2061   else
2062     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2063 }
2064
2065 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2066                                        vlib_node_runtime_t * node,
2067                                        vlib_frame_t * frame)
2068 {
2069   if (adj_are_counters_enabled ())
2070     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2071   else
2072     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2073 }
2074
2075 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2076                                        vlib_node_runtime_t * node,
2077                                        vlib_frame_t * frame)
2078 {
2079   if (adj_are_counters_enabled ())
2080     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2081   else
2082     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2083 }
2084
2085 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2086                                   vlib_node_runtime_t * node,
2087                                   vlib_frame_t * frame)
2088 {
2089   if (adj_are_counters_enabled ())
2090     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2091   else
2092     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2093 }
2094
2095 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2096                                         vlib_node_runtime_t * node,
2097                                         vlib_frame_t * frame)
2098 {
2099   if (adj_are_counters_enabled ())
2100     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2101   else
2102     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2103 }
2104
2105 /* *INDENT-OFF* */
2106 VLIB_REGISTER_NODE (ip6_midchain_node) =
2107 {
2108   .name = "ip6-midchain",
2109   .vector_size = sizeof (u32),
2110   .format_trace = format_ip6_forward_next_trace,
2111   .sibling_of = "ip6-rewrite",
2112   };
2113
2114 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2115 {
2116   .name = "ip6-rewrite",
2117   .vector_size = sizeof (u32),
2118   .format_trace = format_ip6_rewrite_trace,
2119   .n_next_nodes = IP6_REWRITE_N_NEXT,
2120   .next_nodes =
2121   {
2122     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2123     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2124     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2125   },
2126 };
2127
2128 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2129   .name = "ip6-rewrite-bcast",
2130   .vector_size = sizeof (u32),
2131
2132   .format_trace = format_ip6_rewrite_trace,
2133   .sibling_of = "ip6-rewrite",
2134 };
2135
2136 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2137 {
2138   .name = "ip6-rewrite-mcast",
2139   .vector_size = sizeof (u32),
2140   .format_trace = format_ip6_rewrite_trace,
2141   .sibling_of = "ip6-rewrite",
2142 };
2143
2144
2145 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2146 {
2147   .name = "ip6-mcast-midchain",
2148   .vector_size = sizeof (u32),
2149   .format_trace = format_ip6_rewrite_trace,
2150   .sibling_of = "ip6-rewrite",
2151 };
2152
2153 /* *INDENT-ON* */
2154
2155 /*
2156  * Hop-by-Hop handling
2157  */
2158 #ifndef CLIB_MARCH_VARIANT
2159 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2160 #endif /* CLIB_MARCH_VARIANT */
2161
2162 #define foreach_ip6_hop_by_hop_error \
2163 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2164 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2165 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2166
2167 /* *INDENT-OFF* */
2168 typedef enum
2169 {
2170 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2171   foreach_ip6_hop_by_hop_error
2172 #undef _
2173   IP6_HOP_BY_HOP_N_ERROR,
2174 } ip6_hop_by_hop_error_t;
2175 /* *INDENT-ON* */
2176
2177 /*
2178  * Primary h-b-h handler trace support
2179  * We work pretty hard on the problem for obvious reasons
2180  */
2181 typedef struct
2182 {
2183   u32 next_index;
2184   u32 trace_len;
2185   u8 option_data[256];
2186 } ip6_hop_by_hop_trace_t;
2187
2188 extern vlib_node_registration_t ip6_hop_by_hop_node;
2189
2190 static char *ip6_hop_by_hop_error_strings[] = {
2191 #define _(sym,string) string,
2192   foreach_ip6_hop_by_hop_error
2193 #undef _
2194 };
2195
2196 #ifndef CLIB_MARCH_VARIANT
2197 u8 *
2198 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2199 {
2200   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2201   int total_len = va_arg (*args, int);
2202   ip6_hop_by_hop_option_t *opt0, *limit0;
2203   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2204   u8 type0;
2205
2206   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2207               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2208
2209   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2210   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2211
2212   while (opt0 < limit0)
2213     {
2214       type0 = opt0->type;
2215       switch (type0)
2216         {
2217         case 0:         /* Pad, just stop */
2218           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2219           break;
2220
2221         default:
2222           if (hm->trace[type0])
2223             {
2224               s = (*hm->trace[type0]) (s, opt0);
2225             }
2226           else
2227             {
2228               s =
2229                 format (s, "\n    unrecognized option %d length %d", type0,
2230                         opt0->length);
2231             }
2232           opt0 =
2233             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2234                                          sizeof (ip6_hop_by_hop_option_t));
2235           break;
2236         }
2237     }
2238   return s;
2239 }
2240 #endif
2241
2242 static u8 *
2243 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2244 {
2245   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2246   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2247   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2248   ip6_hop_by_hop_header_t *hbh0;
2249   ip6_hop_by_hop_option_t *opt0, *limit0;
2250   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2251
2252   u8 type0;
2253
2254   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2255
2256   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2257               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2258
2259   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2260   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2261
2262   while (opt0 < limit0)
2263     {
2264       type0 = opt0->type;
2265       switch (type0)
2266         {
2267         case 0:         /* Pad, just stop */
2268           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2269           break;
2270
2271         default:
2272           if (hm->trace[type0])
2273             {
2274               s = (*hm->trace[type0]) (s, opt0);
2275             }
2276           else
2277             {
2278               s =
2279                 format (s, "\n    unrecognized option %d length %d", type0,
2280                         opt0->length);
2281             }
2282           opt0 =
2283             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2284                                          sizeof (ip6_hop_by_hop_option_t));
2285           break;
2286         }
2287     }
2288   return s;
2289 }
2290
2291 always_inline u8
2292 ip6_scan_hbh_options (vlib_buffer_t * b0,
2293                       ip6_header_t * ip0,
2294                       ip6_hop_by_hop_header_t * hbh0,
2295                       ip6_hop_by_hop_option_t * opt0,
2296                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2297 {
2298   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2299   u8 type0;
2300   u8 error0 = 0;
2301
2302   while (opt0 < limit0)
2303     {
2304       type0 = opt0->type;
2305       switch (type0)
2306         {
2307         case 0:         /* Pad1 */
2308           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2309           continue;
2310         case 1:         /* PadN */
2311           break;
2312         default:
2313           if (hm->options[type0])
2314             {
2315               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2316                 {
2317                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2318                   return (error0);
2319                 }
2320             }
2321           else
2322             {
2323               /* Unrecognized mandatory option, check the two high order bits */
2324               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2325                 {
2326                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2327                   break;
2328                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2329                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2330                   *next0 = IP_LOOKUP_NEXT_DROP;
2331                   break;
2332                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2333                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2334                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2335                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2336                                                ICMP6_parameter_problem_unrecognized_option,
2337                                                (u8 *) opt0 - (u8 *) ip0);
2338                   break;
2339                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2340                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2341                   if (!ip6_address_is_multicast (&ip0->dst_address))
2342                     {
2343                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2344                       icmp6_error_set_vnet_buffer (b0,
2345                                                    ICMP6_parameter_problem,
2346                                                    ICMP6_parameter_problem_unrecognized_option,
2347                                                    (u8 *) opt0 - (u8 *) ip0);
2348                     }
2349                   else
2350                     {
2351                       *next0 = IP_LOOKUP_NEXT_DROP;
2352                     }
2353                   break;
2354                 }
2355               return (error0);
2356             }
2357         }
2358       opt0 =
2359         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2360                                      sizeof (ip6_hop_by_hop_option_t));
2361     }
2362   return (error0);
2363 }
2364
2365 /*
2366  * Process the Hop-by-Hop Options header
2367  */
2368 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2369                                     vlib_node_runtime_t * node,
2370                                     vlib_frame_t * frame)
2371 {
2372   vlib_node_runtime_t *error_node =
2373     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2374   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2375   u32 n_left_from, *from, *to_next;
2376   ip_lookup_next_t next_index;
2377
2378   from = vlib_frame_vector_args (frame);
2379   n_left_from = frame->n_vectors;
2380   next_index = node->cached_next_index;
2381
2382   while (n_left_from > 0)
2383     {
2384       u32 n_left_to_next;
2385
2386       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2387
2388       while (n_left_from >= 4 && n_left_to_next >= 2)
2389         {
2390           u32 bi0, bi1;
2391           vlib_buffer_t *b0, *b1;
2392           u32 next0, next1;
2393           ip6_header_t *ip0, *ip1;
2394           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2395           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2396           u8 error0 = 0, error1 = 0;
2397
2398           /* Prefetch next iteration. */
2399           {
2400             vlib_buffer_t *p2, *p3;
2401
2402             p2 = vlib_get_buffer (vm, from[2]);
2403             p3 = vlib_get_buffer (vm, from[3]);
2404
2405             vlib_prefetch_buffer_header (p2, LOAD);
2406             vlib_prefetch_buffer_header (p3, LOAD);
2407
2408             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2409             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2410           }
2411
2412           /* Speculatively enqueue b0, b1 to the current next frame */
2413           to_next[0] = bi0 = from[0];
2414           to_next[1] = bi1 = from[1];
2415           from += 2;
2416           to_next += 2;
2417           n_left_from -= 2;
2418           n_left_to_next -= 2;
2419
2420           b0 = vlib_get_buffer (vm, bi0);
2421           b1 = vlib_get_buffer (vm, bi1);
2422
2423           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2424           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2425           ip_adjacency_t *adj0 = adj_get (adj_index0);
2426           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2427           ip_adjacency_t *adj1 = adj_get (adj_index1);
2428
2429           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2430           next0 = adj0->lookup_next_index;
2431           next1 = adj1->lookup_next_index;
2432
2433           ip0 = vlib_buffer_get_current (b0);
2434           ip1 = vlib_buffer_get_current (b1);
2435           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2436           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2437           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2438           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2439           limit0 =
2440             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2441                                          ((hbh0->length + 1) << 3));
2442           limit1 =
2443             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2444                                          ((hbh1->length + 1) << 3));
2445
2446           /*
2447            * Basic validity checks
2448            */
2449           if ((hbh0->length + 1) << 3 >
2450               clib_net_to_host_u16 (ip0->payload_length))
2451             {
2452               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2453               next0 = IP_LOOKUP_NEXT_DROP;
2454               goto outdual;
2455             }
2456           /* Scan the set of h-b-h options, process ones that we understand */
2457           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2458
2459           if ((hbh1->length + 1) << 3 >
2460               clib_net_to_host_u16 (ip1->payload_length))
2461             {
2462               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2463               next1 = IP_LOOKUP_NEXT_DROP;
2464               goto outdual;
2465             }
2466           /* Scan the set of h-b-h options, process ones that we understand */
2467           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2468
2469         outdual:
2470           /* Has the classifier flagged this buffer for special treatment? */
2471           if (PREDICT_FALSE
2472               ((error0 == 0)
2473                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2474             next0 = hm->next_override;
2475
2476           /* Has the classifier flagged this buffer for special treatment? */
2477           if (PREDICT_FALSE
2478               ((error1 == 0)
2479                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2480             next1 = hm->next_override;
2481
2482           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2483             {
2484               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2485                 {
2486                   ip6_hop_by_hop_trace_t *t =
2487                     vlib_add_trace (vm, node, b0, sizeof (*t));
2488                   u32 trace_len = (hbh0->length + 1) << 3;
2489                   t->next_index = next0;
2490                   /* Capture the h-b-h option verbatim */
2491                   trace_len =
2492                     trace_len <
2493                     ARRAY_LEN (t->option_data) ? trace_len :
2494                     ARRAY_LEN (t->option_data);
2495                   t->trace_len = trace_len;
2496                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2497                 }
2498               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2499                 {
2500                   ip6_hop_by_hop_trace_t *t =
2501                     vlib_add_trace (vm, node, b1, sizeof (*t));
2502                   u32 trace_len = (hbh1->length + 1) << 3;
2503                   t->next_index = next1;
2504                   /* Capture the h-b-h option verbatim */
2505                   trace_len =
2506                     trace_len <
2507                     ARRAY_LEN (t->option_data) ? trace_len :
2508                     ARRAY_LEN (t->option_data);
2509                   t->trace_len = trace_len;
2510                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2511                 }
2512
2513             }
2514
2515           b0->error = error_node->errors[error0];
2516           b1->error = error_node->errors[error1];
2517
2518           /* verify speculative enqueue, maybe switch current next frame */
2519           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2520                                            n_left_to_next, bi0, bi1, next0,
2521                                            next1);
2522         }
2523
2524       while (n_left_from > 0 && n_left_to_next > 0)
2525         {
2526           u32 bi0;
2527           vlib_buffer_t *b0;
2528           u32 next0;
2529           ip6_header_t *ip0;
2530           ip6_hop_by_hop_header_t *hbh0;
2531           ip6_hop_by_hop_option_t *opt0, *limit0;
2532           u8 error0 = 0;
2533
2534           /* Speculatively enqueue b0 to the current next frame */
2535           bi0 = from[0];
2536           to_next[0] = bi0;
2537           from += 1;
2538           to_next += 1;
2539           n_left_from -= 1;
2540           n_left_to_next -= 1;
2541
2542           b0 = vlib_get_buffer (vm, bi0);
2543           /*
2544            * Default use the next_index from the adjacency.
2545            * A HBH option rarely redirects to a different node
2546            */
2547           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2548           ip_adjacency_t *adj0 = adj_get (adj_index0);
2549           next0 = adj0->lookup_next_index;
2550
2551           ip0 = vlib_buffer_get_current (b0);
2552           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2553           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2554           limit0 =
2555             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2556                                          ((hbh0->length + 1) << 3));
2557
2558           /*
2559            * Basic validity checks
2560            */
2561           if ((hbh0->length + 1) << 3 >
2562               clib_net_to_host_u16 (ip0->payload_length))
2563             {
2564               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2565               next0 = IP_LOOKUP_NEXT_DROP;
2566               goto out0;
2567             }
2568
2569           /* Scan the set of h-b-h options, process ones that we understand */
2570           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2571
2572         out0:
2573           /* Has the classifier flagged this buffer for special treatment? */
2574           if (PREDICT_FALSE
2575               ((error0 == 0)
2576                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2577             next0 = hm->next_override;
2578
2579           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2580             {
2581               ip6_hop_by_hop_trace_t *t =
2582                 vlib_add_trace (vm, node, b0, sizeof (*t));
2583               u32 trace_len = (hbh0->length + 1) << 3;
2584               t->next_index = next0;
2585               /* Capture the h-b-h option verbatim */
2586               trace_len =
2587                 trace_len <
2588                 ARRAY_LEN (t->option_data) ? trace_len :
2589                 ARRAY_LEN (t->option_data);
2590               t->trace_len = trace_len;
2591               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2592             }
2593
2594           b0->error = error_node->errors[error0];
2595
2596           /* verify speculative enqueue, maybe switch current next frame */
2597           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2598                                            n_left_to_next, bi0, next0);
2599         }
2600       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2601     }
2602   return frame->n_vectors;
2603 }
2604
2605 /* *INDENT-OFF* */
2606 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2607 {
2608   .name = "ip6-hop-by-hop",
2609   .sibling_of = "ip6-lookup",
2610   .vector_size = sizeof (u32),
2611   .format_trace = format_ip6_hop_by_hop_trace,
2612   .type = VLIB_NODE_TYPE_INTERNAL,
2613   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2614   .error_strings = ip6_hop_by_hop_error_strings,
2615   .n_next_nodes = 0,
2616 };
2617 /* *INDENT-ON* */
2618
2619 static clib_error_t *
2620 ip6_hop_by_hop_init (vlib_main_t * vm)
2621 {
2622   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2623   clib_memset (hm->options, 0, sizeof (hm->options));
2624   clib_memset (hm->trace, 0, sizeof (hm->trace));
2625   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2626   return (0);
2627 }
2628
2629 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2630
2631 #ifndef CLIB_MARCH_VARIANT
2632 void
2633 ip6_hbh_set_next_override (uword next)
2634 {
2635   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2636
2637   hm->next_override = next;
2638 }
2639
2640 int
2641 ip6_hbh_register_option (u8 option,
2642                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2643                                       ip6_hop_by_hop_option_t * opt),
2644                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2645 {
2646   ip6_main_t *im = &ip6_main;
2647   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2648
2649   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2650
2651   /* Already registered */
2652   if (hm->options[option])
2653     return (-1);
2654
2655   hm->options[option] = options;
2656   hm->trace[option] = trace;
2657
2658   /* Set global variable */
2659   im->hbh_enabled = 1;
2660
2661   return (0);
2662 }
2663
2664 int
2665 ip6_hbh_unregister_option (u8 option)
2666 {
2667   ip6_main_t *im = &ip6_main;
2668   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2669
2670   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2671
2672   /* Not registered */
2673   if (!hm->options[option])
2674     return (-1);
2675
2676   hm->options[option] = NULL;
2677   hm->trace[option] = NULL;
2678
2679   /* Disable global knob if this was the last option configured */
2680   int i;
2681   bool found = false;
2682   for (i = 0; i < 256; i++)
2683     {
2684       if (hm->options[option])
2685         {
2686           found = true;
2687           break;
2688         }
2689     }
2690   if (!found)
2691     im->hbh_enabled = 0;
2692
2693   return (0);
2694 }
2695
2696 /* Global IP6 main. */
2697 ip6_main_t ip6_main;
2698 #endif
2699
2700 static clib_error_t *
2701 ip6_lookup_init (vlib_main_t * vm)
2702 {
2703   ip6_main_t *im = &ip6_main;
2704   clib_error_t *error;
2705   uword i;
2706
2707   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2708     return error;
2709
2710   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2711     {
2712       u32 j, i0, i1;
2713
2714       i0 = i / 32;
2715       i1 = i % 32;
2716
2717       for (j = 0; j < i0; j++)
2718         im->fib_masks[i].as_u32[j] = ~0;
2719
2720       if (i1)
2721         im->fib_masks[i].as_u32[i0] =
2722           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2723     }
2724
2725   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2726
2727   if (im->lookup_table_nbuckets == 0)
2728     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2729
2730   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2731
2732   if (im->lookup_table_size == 0)
2733     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2734
2735   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2736                          "ip6 FIB fwding table",
2737                          im->lookup_table_nbuckets, im->lookup_table_size);
2738   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2739                          "ip6 FIB non-fwding table",
2740                          im->lookup_table_nbuckets, im->lookup_table_size);
2741   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2742                          "ip6 mFIB table",
2743                          im->lookup_table_nbuckets, im->lookup_table_size);
2744
2745   /* Create FIB with index 0 and table id of 0. */
2746   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2747                                      FIB_SOURCE_DEFAULT_ROUTE);
2748   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2749                                       MFIB_SOURCE_DEFAULT_ROUTE);
2750
2751   {
2752     pg_node_t *pn;
2753     pn = pg_get_node (ip6_lookup_node.index);
2754     pn->unformat_edit = unformat_pg_ip6_header;
2755   }
2756
2757   /* Unless explicitly configured, don't process HBH options */
2758   im->hbh_enabled = 0;
2759
2760   return error;
2761 }
2762
2763 VLIB_INIT_FUNCTION (ip6_lookup_init);
2764
2765 #ifndef CLIB_MARCH_VARIANT
2766 int
2767 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2768 {
2769   u32 fib_index;
2770
2771   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2772
2773   if (~0 == fib_index)
2774     return VNET_API_ERROR_NO_SUCH_FIB;
2775
2776   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2777                                   flow_hash_config);
2778
2779   return 0;
2780 }
2781 #endif
2782
2783 static clib_error_t *
2784 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2785                               unformat_input_t * input,
2786                               vlib_cli_command_t * cmd)
2787 {
2788   int matched = 0;
2789   u32 table_id = 0;
2790   u32 flow_hash_config = 0;
2791   int rv;
2792
2793   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2794     {
2795       if (unformat (input, "table %d", &table_id))
2796         matched = 1;
2797 #define _(a,v) \
2798     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2799       foreach_flow_hash_bit
2800 #undef _
2801         else
2802         break;
2803     }
2804
2805   if (matched == 0)
2806     return clib_error_return (0, "unknown input `%U'",
2807                               format_unformat_error, input);
2808
2809   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2810   switch (rv)
2811     {
2812     case 0:
2813       break;
2814
2815     case -1:
2816       return clib_error_return (0, "no such FIB table %d", table_id);
2817
2818     default:
2819       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2820       break;
2821     }
2822
2823   return 0;
2824 }
2825
2826 /*?
2827  * Configure the set of IPv6 fields used by the flow hash.
2828  *
2829  * @cliexpar
2830  * @parblock
2831  * Example of how to set the flow hash on a given table:
2832  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2833  *
2834  * Example of display the configured flow hash:
2835  * @cliexstart{show ip6 fib}
2836  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2837  * @::/0
2838  *   unicast-ip6-chain
2839  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2840  *     [0] [@0]: dpo-drop ip6
2841  * fe80::/10
2842  *   unicast-ip6-chain
2843  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2844  *     [0] [@2]: dpo-receive
2845  * ff02::1/128
2846  *   unicast-ip6-chain
2847  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2848  *     [0] [@2]: dpo-receive
2849  * ff02::2/128
2850  *   unicast-ip6-chain
2851  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2852  *     [0] [@2]: dpo-receive
2853  * ff02::16/128
2854  *   unicast-ip6-chain
2855  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2856  *     [0] [@2]: dpo-receive
2857  * ff02::1:ff00:0/104
2858  *   unicast-ip6-chain
2859  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2860  *     [0] [@2]: dpo-receive
2861  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2862  * @::/0
2863  *   unicast-ip6-chain
2864  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2865  *     [0] [@0]: dpo-drop ip6
2866  * @::a:1:1:0:4/126
2867  *   unicast-ip6-chain
2868  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2869  *     [0] [@4]: ipv6-glean: af_packet0
2870  * @::a:1:1:0:7/128
2871  *   unicast-ip6-chain
2872  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2873  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2874  * fe80::/10
2875  *   unicast-ip6-chain
2876  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2877  *     [0] [@2]: dpo-receive
2878  * fe80::fe:3eff:fe3e:9222/128
2879  *   unicast-ip6-chain
2880  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2881  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2882  * ff02::1/128
2883  *   unicast-ip6-chain
2884  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2885  *     [0] [@2]: dpo-receive
2886  * ff02::2/128
2887  *   unicast-ip6-chain
2888  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2889  *     [0] [@2]: dpo-receive
2890  * ff02::16/128
2891  *   unicast-ip6-chain
2892  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2893  *     [0] [@2]: dpo-receive
2894  * ff02::1:ff00:0/104
2895  *   unicast-ip6-chain
2896  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2897  *     [0] [@2]: dpo-receive
2898  * @cliexend
2899  * @endparblock
2900 ?*/
2901 /* *INDENT-OFF* */
2902 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2903 {
2904   .path = "set ip6 flow-hash",
2905   .short_help =
2906   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2907   .function = set_ip6_flow_hash_command_fn,
2908 };
2909 /* *INDENT-ON* */
2910
2911 static clib_error_t *
2912 show_ip6_local_command_fn (vlib_main_t * vm,
2913                            unformat_input_t * input, vlib_cli_command_t * cmd)
2914 {
2915   ip6_main_t *im = &ip6_main;
2916   ip_lookup_main_t *lm = &im->lookup_main;
2917   int i;
2918
2919   vlib_cli_output (vm, "Protocols handled by ip6_local");
2920   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2921     {
2922       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2923         {
2924
2925           u32 node_index = vlib_get_node (vm,
2926                                           ip6_local_node.index)->
2927             next_nodes[lm->local_next_by_ip_protocol[i]];
2928           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2929                            node_index);
2930         }
2931     }
2932   return 0;
2933 }
2934
2935
2936
2937 /*?
2938  * Display the set of protocols handled by the local IPv6 stack.
2939  *
2940  * @cliexpar
2941  * Example of how to display local protocol table:
2942  * @cliexstart{show ip6 local}
2943  * Protocols handled by ip6_local
2944  * 17
2945  * 43
2946  * 58
2947  * 115
2948  * @cliexend
2949 ?*/
2950 /* *INDENT-OFF* */
2951 VLIB_CLI_COMMAND (show_ip6_local, static) =
2952 {
2953   .path = "show ip6 local",
2954   .function = show_ip6_local_command_fn,
2955   .short_help = "show ip6 local",
2956 };
2957 /* *INDENT-ON* */
2958
2959 #ifndef CLIB_MARCH_VARIANT
2960 int
2961 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2962                              u32 table_index)
2963 {
2964   vnet_main_t *vnm = vnet_get_main ();
2965   vnet_interface_main_t *im = &vnm->interface_main;
2966   ip6_main_t *ipm = &ip6_main;
2967   ip_lookup_main_t *lm = &ipm->lookup_main;
2968   vnet_classify_main_t *cm = &vnet_classify_main;
2969   ip6_address_t *if_addr;
2970
2971   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2972     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2973
2974   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2975     return VNET_API_ERROR_NO_SUCH_ENTRY;
2976
2977   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2978   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2979
2980   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2981
2982   if (NULL != if_addr)
2983     {
2984       fib_prefix_t pfx = {
2985         .fp_len = 128,
2986         .fp_proto = FIB_PROTOCOL_IP6,
2987         .fp_addr.ip6 = *if_addr,
2988       };
2989       u32 fib_index;
2990
2991       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2992                                                        sw_if_index);
2993
2994
2995       if (table_index != (u32) ~ 0)
2996         {
2997           dpo_id_t dpo = DPO_INVALID;
2998
2999           dpo_set (&dpo,
3000                    DPO_CLASSIFY,
3001                    DPO_PROTO_IP6,
3002                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3003
3004           fib_table_entry_special_dpo_add (fib_index,
3005                                            &pfx,
3006                                            FIB_SOURCE_CLASSIFY,
3007                                            FIB_ENTRY_FLAG_NONE, &dpo);
3008           dpo_reset (&dpo);
3009         }
3010       else
3011         {
3012           fib_table_entry_special_remove (fib_index,
3013                                           &pfx, FIB_SOURCE_CLASSIFY);
3014         }
3015     }
3016
3017   return 0;
3018 }
3019 #endif
3020
3021 static clib_error_t *
3022 set_ip6_classify_command_fn (vlib_main_t * vm,
3023                              unformat_input_t * input,
3024                              vlib_cli_command_t * cmd)
3025 {
3026   u32 table_index = ~0;
3027   int table_index_set = 0;
3028   u32 sw_if_index = ~0;
3029   int rv;
3030
3031   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3032     {
3033       if (unformat (input, "table-index %d", &table_index))
3034         table_index_set = 1;
3035       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3036                          vnet_get_main (), &sw_if_index))
3037         ;
3038       else
3039         break;
3040     }
3041
3042   if (table_index_set == 0)
3043     return clib_error_return (0, "classify table-index must be specified");
3044
3045   if (sw_if_index == ~0)
3046     return clib_error_return (0, "interface / subif must be specified");
3047
3048   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3049
3050   switch (rv)
3051     {
3052     case 0:
3053       break;
3054
3055     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3056       return clib_error_return (0, "No such interface");
3057
3058     case VNET_API_ERROR_NO_SUCH_ENTRY:
3059       return clib_error_return (0, "No such classifier table");
3060     }
3061   return 0;
3062 }
3063
3064 /*?
3065  * Assign a classification table to an interface. The classification
3066  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3067  * commands. Once the table is create, use this command to filter packets
3068  * on an interface.
3069  *
3070  * @cliexpar
3071  * Example of how to assign a classification table to an interface:
3072  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3073 ?*/
3074 /* *INDENT-OFF* */
3075 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3076 {
3077   .path = "set ip6 classify",
3078   .short_help =
3079   "set ip6 classify intfc <interface> table-index <classify-idx>",
3080   .function = set_ip6_classify_command_fn,
3081 };
3082 /* *INDENT-ON* */
3083
3084 static clib_error_t *
3085 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3086 {
3087   ip6_main_t *im = &ip6_main;
3088   uword heapsize = 0;
3089   u32 tmp;
3090   u32 nbuckets = 0;
3091
3092   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3093     {
3094       if (unformat (input, "hash-buckets %d", &tmp))
3095         nbuckets = tmp;
3096       else if (unformat (input, "heap-size %U",
3097                          unformat_memory_size, &heapsize))
3098         ;
3099       else
3100         return clib_error_return (0, "unknown input '%U'",
3101                                   format_unformat_error, input);
3102     }
3103
3104   im->lookup_table_nbuckets = nbuckets;
3105   im->lookup_table_size = heapsize;
3106
3107   return 0;
3108 }
3109
3110 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3111
3112 /*
3113  * fd.io coding-style-patch-verification: ON
3114  *
3115  * Local Variables:
3116  * eval: (c-set-style "gnu")
3117  * End:
3118  */