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           else
1748             {
1749               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1750             }
1751           is_locally_originated1 =
1752             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1753           if (PREDICT_TRUE (!is_locally_originated1))
1754             {
1755               i32 hop_limit1 = ip1->hop_limit;
1756
1757               /* Input node should have reject packets with hop limit 0. */
1758               ASSERT (ip1->hop_limit > 0);
1759
1760               hop_limit1 -= 1;
1761
1762               ip1->hop_limit = hop_limit1;
1763
1764               /*
1765                * If the hop count drops below 1 when forwarding, generate
1766                * an ICMP response.
1767                */
1768               if (PREDICT_FALSE (hop_limit1 <= 0))
1769                 {
1770                   error1 = IP6_ERROR_TIME_EXPIRED;
1771                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1772                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1773                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1774                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1775                                                0);
1776                 }
1777             }
1778           else
1779             {
1780               p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1781             }
1782           adj0 = adj_get (adj_index0);
1783           adj1 = adj_get (adj_index1);
1784
1785           rw_len0 = adj0[0].rewrite_header.data_bytes;
1786           rw_len1 = adj1[0].rewrite_header.data_bytes;
1787           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1788           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1789
1790           if (do_counters)
1791             {
1792               vlib_increment_combined_counter
1793                 (&adjacency_counters,
1794                  thread_index, adj_index0, 1,
1795                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1796               vlib_increment_combined_counter
1797                 (&adjacency_counters,
1798                  thread_index, adj_index1, 1,
1799                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1800             }
1801
1802           /* Check MTU of outgoing interface. */
1803           u16 ip0_len =
1804             clib_net_to_host_u16 (ip0->payload_length) +
1805             sizeof (ip6_header_t);
1806           u16 ip1_len =
1807             clib_net_to_host_u16 (ip1->payload_length) +
1808             sizeof (ip6_header_t);
1809           if (p0->flags & VNET_BUFFER_F_GSO)
1810             ip0_len = gso_mtu_sz (p0);
1811           if (p1->flags & VNET_BUFFER_F_GSO)
1812             ip1_len = gso_mtu_sz (p1);
1813
1814
1815
1816           ip6_mtu_check (p0, ip0_len,
1817                          adj0[0].rewrite_header.max_l3_packet_bytes,
1818                          is_locally_originated0, &next0, is_midchain,
1819                          &error0);
1820           ip6_mtu_check (p1, ip1_len,
1821                          adj1[0].rewrite_header.max_l3_packet_bytes,
1822                          is_locally_originated1, &next1, is_midchain,
1823                          &error1);
1824
1825           /* Don't adjust the buffer for hop count issue; icmp-error node
1826            * wants to see the IP header */
1827           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1828             {
1829               p0->current_data -= rw_len0;
1830               p0->current_length += rw_len0;
1831
1832               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1833               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1834               next0 = adj0[0].rewrite_header.next_index;
1835
1836               if (PREDICT_FALSE
1837                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1838                 vnet_feature_arc_start (lm->output_feature_arc_index,
1839                                         tx_sw_if_index0, &next0, p0);
1840             }
1841           else
1842             {
1843               p0->error = error_node->errors[error0];
1844             }
1845           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1846             {
1847               p1->current_data -= rw_len1;
1848               p1->current_length += rw_len1;
1849
1850               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1851               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1852               next1 = adj1[0].rewrite_header.next_index;
1853
1854               if (PREDICT_FALSE
1855                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1856                 vnet_feature_arc_start (lm->output_feature_arc_index,
1857                                         tx_sw_if_index1, &next1, p1);
1858             }
1859           else
1860             {
1861               p1->error = error_node->errors[error1];
1862             }
1863
1864           if (is_midchain)
1865             {
1866               /* before we paint on the next header, update the L4
1867                * checksums if required, since there's no offload on a tunnel */
1868               calc_checksums (vm, p0);
1869               calc_checksums (vm, p1);
1870             }
1871
1872           /* Guess we are only writing on simple Ethernet header. */
1873           vnet_rewrite_two_headers (adj0[0], adj1[0],
1874                                     ip0, ip1, sizeof (ethernet_header_t));
1875
1876           if (is_midchain)
1877             {
1878               if (adj0->sub_type.midchain.fixup_func)
1879                 adj0->sub_type.midchain.fixup_func
1880                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1881               if (adj1->sub_type.midchain.fixup_func)
1882                 adj1->sub_type.midchain.fixup_func
1883                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1884             }
1885           if (is_mcast)
1886             {
1887               /*
1888                * copy bytes from the IP address into the MAC rewrite
1889                */
1890               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1891                                           adj0->
1892                                           rewrite_header.dst_mcast_offset,
1893                                           &ip0->dst_address.as_u32[3],
1894                                           (u8 *) ip0);
1895               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1896                                           adj1->
1897                                           rewrite_header.dst_mcast_offset,
1898                                           &ip1->dst_address.as_u32[3],
1899                                           (u8 *) ip1);
1900             }
1901
1902           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1903                                            to_next, n_left_to_next,
1904                                            pi0, pi1, next0, next1);
1905         }
1906
1907       while (n_left_from > 0 && n_left_to_next > 0)
1908         {
1909           ip_adjacency_t *adj0;
1910           vlib_buffer_t *p0;
1911           ip6_header_t *ip0;
1912           u32 pi0, rw_len0;
1913           u32 adj_index0, next0, error0;
1914           u32 tx_sw_if_index0;
1915           bool is_locally_originated0;
1916
1917           pi0 = to_next[0] = from[0];
1918
1919           p0 = vlib_get_buffer (vm, pi0);
1920
1921           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1922
1923           adj0 = adj_get (adj_index0);
1924
1925           ip0 = vlib_buffer_get_current (p0);
1926
1927           error0 = IP6_ERROR_NONE;
1928           next0 = IP6_REWRITE_NEXT_DROP;
1929
1930           /* Check hop limit */
1931           is_locally_originated0 =
1932             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1933           if (PREDICT_TRUE (!is_locally_originated0))
1934             {
1935               i32 hop_limit0 = ip0->hop_limit;
1936
1937               ASSERT (ip0->hop_limit > 0);
1938
1939               hop_limit0 -= 1;
1940
1941               ip0->hop_limit = hop_limit0;
1942
1943               if (PREDICT_FALSE (hop_limit0 <= 0))
1944                 {
1945                   /*
1946                    * If the hop count drops below 1 when forwarding, generate
1947                    * an ICMP response.
1948                    */
1949                   error0 = IP6_ERROR_TIME_EXPIRED;
1950                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1951                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1952                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1953                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1954                                                0);
1955                 }
1956             }
1957           else
1958             {
1959               p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1960             }
1961
1962           if (is_midchain)
1963             {
1964               calc_checksums (vm, p0);
1965             }
1966
1967           /* Guess we are only writing on simple Ethernet header. */
1968           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1969
1970           /* Update packet buffer attributes/set output interface. */
1971           rw_len0 = adj0[0].rewrite_header.data_bytes;
1972           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1973
1974           if (do_counters)
1975             {
1976               vlib_increment_combined_counter
1977                 (&adjacency_counters,
1978                  thread_index, adj_index0, 1,
1979                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1980             }
1981
1982           /* Check MTU of outgoing interface. */
1983           u16 ip0_len =
1984             clib_net_to_host_u16 (ip0->payload_length) +
1985             sizeof (ip6_header_t);
1986           if (p0->flags & VNET_BUFFER_F_GSO)
1987             ip0_len = gso_mtu_sz (p0);
1988
1989           ip6_mtu_check (p0, ip0_len,
1990                          adj0[0].rewrite_header.max_l3_packet_bytes,
1991                          is_locally_originated0, &next0, is_midchain,
1992                          &error0);
1993
1994           /* Don't adjust the buffer for hop count issue; icmp-error node
1995            * wants to see the IP header */
1996           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1997             {
1998               p0->current_data -= rw_len0;
1999               p0->current_length += rw_len0;
2000
2001               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2002
2003               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2004               next0 = adj0[0].rewrite_header.next_index;
2005
2006               if (PREDICT_FALSE
2007                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2008                 vnet_feature_arc_start (lm->output_feature_arc_index,
2009                                         tx_sw_if_index0, &next0, p0);
2010             }
2011           else
2012             {
2013               p0->error = error_node->errors[error0];
2014             }
2015
2016           if (is_midchain)
2017             {
2018               if (adj0->sub_type.midchain.fixup_func)
2019                 adj0->sub_type.midchain.fixup_func
2020                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2021             }
2022           if (is_mcast)
2023             {
2024               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2025                                           adj0->
2026                                           rewrite_header.dst_mcast_offset,
2027                                           &ip0->dst_address.as_u32[3],
2028                                           (u8 *) ip0);
2029             }
2030
2031           from += 1;
2032           n_left_from -= 1;
2033           to_next += 1;
2034           n_left_to_next -= 1;
2035
2036           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2037                                            to_next, n_left_to_next,
2038                                            pi0, next0);
2039         }
2040
2041       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2042     }
2043
2044   /* Need to do trace after rewrites to pick up new packet data. */
2045   if (node->flags & VLIB_NODE_FLAG_TRACE)
2046     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2047
2048   return frame->n_vectors;
2049 }
2050
2051 always_inline uword
2052 ip6_rewrite_inline (vlib_main_t * vm,
2053                     vlib_node_runtime_t * node,
2054                     vlib_frame_t * frame,
2055                     int do_counters, int is_midchain, int is_mcast)
2056 {
2057   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2058                                       is_midchain, is_mcast);
2059 }
2060
2061 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2062                                  vlib_node_runtime_t * node,
2063                                  vlib_frame_t * frame)
2064 {
2065   if (adj_are_counters_enabled ())
2066     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2067   else
2068     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2069 }
2070
2071 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2072                                        vlib_node_runtime_t * node,
2073                                        vlib_frame_t * frame)
2074 {
2075   if (adj_are_counters_enabled ())
2076     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2077   else
2078     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2079 }
2080
2081 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2082                                        vlib_node_runtime_t * node,
2083                                        vlib_frame_t * frame)
2084 {
2085   if (adj_are_counters_enabled ())
2086     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2087   else
2088     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2089 }
2090
2091 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2092                                   vlib_node_runtime_t * node,
2093                                   vlib_frame_t * frame)
2094 {
2095   if (adj_are_counters_enabled ())
2096     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2097   else
2098     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2099 }
2100
2101 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2102                                         vlib_node_runtime_t * node,
2103                                         vlib_frame_t * frame)
2104 {
2105   if (adj_are_counters_enabled ())
2106     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2107   else
2108     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2109 }
2110
2111 /* *INDENT-OFF* */
2112 VLIB_REGISTER_NODE (ip6_midchain_node) =
2113 {
2114   .name = "ip6-midchain",
2115   .vector_size = sizeof (u32),
2116   .format_trace = format_ip6_forward_next_trace,
2117   .sibling_of = "ip6-rewrite",
2118   };
2119
2120 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2121 {
2122   .name = "ip6-rewrite",
2123   .vector_size = sizeof (u32),
2124   .format_trace = format_ip6_rewrite_trace,
2125   .n_next_nodes = IP6_REWRITE_N_NEXT,
2126   .next_nodes =
2127   {
2128     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2129     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2130     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2131   },
2132 };
2133
2134 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2135   .name = "ip6-rewrite-bcast",
2136   .vector_size = sizeof (u32),
2137
2138   .format_trace = format_ip6_rewrite_trace,
2139   .sibling_of = "ip6-rewrite",
2140 };
2141
2142 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2143 {
2144   .name = "ip6-rewrite-mcast",
2145   .vector_size = sizeof (u32),
2146   .format_trace = format_ip6_rewrite_trace,
2147   .sibling_of = "ip6-rewrite",
2148 };
2149
2150
2151 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2152 {
2153   .name = "ip6-mcast-midchain",
2154   .vector_size = sizeof (u32),
2155   .format_trace = format_ip6_rewrite_trace,
2156   .sibling_of = "ip6-rewrite",
2157 };
2158
2159 /* *INDENT-ON* */
2160
2161 /*
2162  * Hop-by-Hop handling
2163  */
2164 #ifndef CLIB_MARCH_VARIANT
2165 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2166 #endif /* CLIB_MARCH_VARIANT */
2167
2168 #define foreach_ip6_hop_by_hop_error \
2169 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2170 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2171 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2172
2173 /* *INDENT-OFF* */
2174 typedef enum
2175 {
2176 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2177   foreach_ip6_hop_by_hop_error
2178 #undef _
2179   IP6_HOP_BY_HOP_N_ERROR,
2180 } ip6_hop_by_hop_error_t;
2181 /* *INDENT-ON* */
2182
2183 /*
2184  * Primary h-b-h handler trace support
2185  * We work pretty hard on the problem for obvious reasons
2186  */
2187 typedef struct
2188 {
2189   u32 next_index;
2190   u32 trace_len;
2191   u8 option_data[256];
2192 } ip6_hop_by_hop_trace_t;
2193
2194 extern vlib_node_registration_t ip6_hop_by_hop_node;
2195
2196 static char *ip6_hop_by_hop_error_strings[] = {
2197 #define _(sym,string) string,
2198   foreach_ip6_hop_by_hop_error
2199 #undef _
2200 };
2201
2202 #ifndef CLIB_MARCH_VARIANT
2203 u8 *
2204 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2205 {
2206   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2207   int total_len = va_arg (*args, int);
2208   ip6_hop_by_hop_option_t *opt0, *limit0;
2209   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2210   u8 type0;
2211
2212   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2213               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2214
2215   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2216   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2217
2218   while (opt0 < limit0)
2219     {
2220       type0 = opt0->type;
2221       switch (type0)
2222         {
2223         case 0:         /* Pad, just stop */
2224           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2225           break;
2226
2227         default:
2228           if (hm->trace[type0])
2229             {
2230               s = (*hm->trace[type0]) (s, opt0);
2231             }
2232           else
2233             {
2234               s =
2235                 format (s, "\n    unrecognized option %d length %d", type0,
2236                         opt0->length);
2237             }
2238           opt0 =
2239             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2240                                          sizeof (ip6_hop_by_hop_option_t));
2241           break;
2242         }
2243     }
2244   return s;
2245 }
2246 #endif
2247
2248 static u8 *
2249 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2250 {
2251   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2252   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2253   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2254   ip6_hop_by_hop_header_t *hbh0;
2255   ip6_hop_by_hop_option_t *opt0, *limit0;
2256   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2257
2258   u8 type0;
2259
2260   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2261
2262   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2263               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2264
2265   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2266   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2267
2268   while (opt0 < limit0)
2269     {
2270       type0 = opt0->type;
2271       switch (type0)
2272         {
2273         case 0:         /* Pad, just stop */
2274           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2275           break;
2276
2277         default:
2278           if (hm->trace[type0])
2279             {
2280               s = (*hm->trace[type0]) (s, opt0);
2281             }
2282           else
2283             {
2284               s =
2285                 format (s, "\n    unrecognized option %d length %d", type0,
2286                         opt0->length);
2287             }
2288           opt0 =
2289             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2290                                          sizeof (ip6_hop_by_hop_option_t));
2291           break;
2292         }
2293     }
2294   return s;
2295 }
2296
2297 always_inline u8
2298 ip6_scan_hbh_options (vlib_buffer_t * b0,
2299                       ip6_header_t * ip0,
2300                       ip6_hop_by_hop_header_t * hbh0,
2301                       ip6_hop_by_hop_option_t * opt0,
2302                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2303 {
2304   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2305   u8 type0;
2306   u8 error0 = 0;
2307
2308   while (opt0 < limit0)
2309     {
2310       type0 = opt0->type;
2311       switch (type0)
2312         {
2313         case 0:         /* Pad1 */
2314           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2315           continue;
2316         case 1:         /* PadN */
2317           break;
2318         default:
2319           if (hm->options[type0])
2320             {
2321               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2322                 {
2323                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2324                   return (error0);
2325                 }
2326             }
2327           else
2328             {
2329               /* Unrecognized mandatory option, check the two high order bits */
2330               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2331                 {
2332                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2333                   break;
2334                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2335                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2336                   *next0 = IP_LOOKUP_NEXT_DROP;
2337                   break;
2338                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2339                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2340                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2341                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2342                                                ICMP6_parameter_problem_unrecognized_option,
2343                                                (u8 *) opt0 - (u8 *) ip0);
2344                   break;
2345                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2346                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2347                   if (!ip6_address_is_multicast (&ip0->dst_address))
2348                     {
2349                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2350                       icmp6_error_set_vnet_buffer (b0,
2351                                                    ICMP6_parameter_problem,
2352                                                    ICMP6_parameter_problem_unrecognized_option,
2353                                                    (u8 *) opt0 - (u8 *) ip0);
2354                     }
2355                   else
2356                     {
2357                       *next0 = IP_LOOKUP_NEXT_DROP;
2358                     }
2359                   break;
2360                 }
2361               return (error0);
2362             }
2363         }
2364       opt0 =
2365         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2366                                      sizeof (ip6_hop_by_hop_option_t));
2367     }
2368   return (error0);
2369 }
2370
2371 /*
2372  * Process the Hop-by-Hop Options header
2373  */
2374 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2375                                     vlib_node_runtime_t * node,
2376                                     vlib_frame_t * frame)
2377 {
2378   vlib_node_runtime_t *error_node =
2379     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2380   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2381   u32 n_left_from, *from, *to_next;
2382   ip_lookup_next_t next_index;
2383
2384   from = vlib_frame_vector_args (frame);
2385   n_left_from = frame->n_vectors;
2386   next_index = node->cached_next_index;
2387
2388   while (n_left_from > 0)
2389     {
2390       u32 n_left_to_next;
2391
2392       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2393
2394       while (n_left_from >= 4 && n_left_to_next >= 2)
2395         {
2396           u32 bi0, bi1;
2397           vlib_buffer_t *b0, *b1;
2398           u32 next0, next1;
2399           ip6_header_t *ip0, *ip1;
2400           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2401           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2402           u8 error0 = 0, error1 = 0;
2403
2404           /* Prefetch next iteration. */
2405           {
2406             vlib_buffer_t *p2, *p3;
2407
2408             p2 = vlib_get_buffer (vm, from[2]);
2409             p3 = vlib_get_buffer (vm, from[3]);
2410
2411             vlib_prefetch_buffer_header (p2, LOAD);
2412             vlib_prefetch_buffer_header (p3, LOAD);
2413
2414             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2415             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2416           }
2417
2418           /* Speculatively enqueue b0, b1 to the current next frame */
2419           to_next[0] = bi0 = from[0];
2420           to_next[1] = bi1 = from[1];
2421           from += 2;
2422           to_next += 2;
2423           n_left_from -= 2;
2424           n_left_to_next -= 2;
2425
2426           b0 = vlib_get_buffer (vm, bi0);
2427           b1 = vlib_get_buffer (vm, bi1);
2428
2429           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2430           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2431           ip_adjacency_t *adj0 = adj_get (adj_index0);
2432           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2433           ip_adjacency_t *adj1 = adj_get (adj_index1);
2434
2435           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2436           next0 = adj0->lookup_next_index;
2437           next1 = adj1->lookup_next_index;
2438
2439           ip0 = vlib_buffer_get_current (b0);
2440           ip1 = vlib_buffer_get_current (b1);
2441           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2442           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2443           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2444           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2445           limit0 =
2446             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2447                                          ((hbh0->length + 1) << 3));
2448           limit1 =
2449             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2450                                          ((hbh1->length + 1) << 3));
2451
2452           /*
2453            * Basic validity checks
2454            */
2455           if ((hbh0->length + 1) << 3 >
2456               clib_net_to_host_u16 (ip0->payload_length))
2457             {
2458               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2459               next0 = IP_LOOKUP_NEXT_DROP;
2460               goto outdual;
2461             }
2462           /* Scan the set of h-b-h options, process ones that we understand */
2463           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2464
2465           if ((hbh1->length + 1) << 3 >
2466               clib_net_to_host_u16 (ip1->payload_length))
2467             {
2468               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2469               next1 = IP_LOOKUP_NEXT_DROP;
2470               goto outdual;
2471             }
2472           /* Scan the set of h-b-h options, process ones that we understand */
2473           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2474
2475         outdual:
2476           /* Has the classifier flagged this buffer for special treatment? */
2477           if (PREDICT_FALSE
2478               ((error0 == 0)
2479                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2480             next0 = hm->next_override;
2481
2482           /* Has the classifier flagged this buffer for special treatment? */
2483           if (PREDICT_FALSE
2484               ((error1 == 0)
2485                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2486             next1 = hm->next_override;
2487
2488           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2489             {
2490               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2491                 {
2492                   ip6_hop_by_hop_trace_t *t =
2493                     vlib_add_trace (vm, node, b0, sizeof (*t));
2494                   u32 trace_len = (hbh0->length + 1) << 3;
2495                   t->next_index = next0;
2496                   /* Capture the h-b-h option verbatim */
2497                   trace_len =
2498                     trace_len <
2499                     ARRAY_LEN (t->option_data) ? trace_len :
2500                     ARRAY_LEN (t->option_data);
2501                   t->trace_len = trace_len;
2502                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2503                 }
2504               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2505                 {
2506                   ip6_hop_by_hop_trace_t *t =
2507                     vlib_add_trace (vm, node, b1, sizeof (*t));
2508                   u32 trace_len = (hbh1->length + 1) << 3;
2509                   t->next_index = next1;
2510                   /* Capture the h-b-h option verbatim */
2511                   trace_len =
2512                     trace_len <
2513                     ARRAY_LEN (t->option_data) ? trace_len :
2514                     ARRAY_LEN (t->option_data);
2515                   t->trace_len = trace_len;
2516                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2517                 }
2518
2519             }
2520
2521           b0->error = error_node->errors[error0];
2522           b1->error = error_node->errors[error1];
2523
2524           /* verify speculative enqueue, maybe switch current next frame */
2525           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2526                                            n_left_to_next, bi0, bi1, next0,
2527                                            next1);
2528         }
2529
2530       while (n_left_from > 0 && n_left_to_next > 0)
2531         {
2532           u32 bi0;
2533           vlib_buffer_t *b0;
2534           u32 next0;
2535           ip6_header_t *ip0;
2536           ip6_hop_by_hop_header_t *hbh0;
2537           ip6_hop_by_hop_option_t *opt0, *limit0;
2538           u8 error0 = 0;
2539
2540           /* Speculatively enqueue b0 to the current next frame */
2541           bi0 = from[0];
2542           to_next[0] = bi0;
2543           from += 1;
2544           to_next += 1;
2545           n_left_from -= 1;
2546           n_left_to_next -= 1;
2547
2548           b0 = vlib_get_buffer (vm, bi0);
2549           /*
2550            * Default use the next_index from the adjacency.
2551            * A HBH option rarely redirects to a different node
2552            */
2553           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2554           ip_adjacency_t *adj0 = adj_get (adj_index0);
2555           next0 = adj0->lookup_next_index;
2556
2557           ip0 = vlib_buffer_get_current (b0);
2558           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2559           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2560           limit0 =
2561             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2562                                          ((hbh0->length + 1) << 3));
2563
2564           /*
2565            * Basic validity checks
2566            */
2567           if ((hbh0->length + 1) << 3 >
2568               clib_net_to_host_u16 (ip0->payload_length))
2569             {
2570               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2571               next0 = IP_LOOKUP_NEXT_DROP;
2572               goto out0;
2573             }
2574
2575           /* Scan the set of h-b-h options, process ones that we understand */
2576           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2577
2578         out0:
2579           /* Has the classifier flagged this buffer for special treatment? */
2580           if (PREDICT_FALSE
2581               ((error0 == 0)
2582                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2583             next0 = hm->next_override;
2584
2585           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2586             {
2587               ip6_hop_by_hop_trace_t *t =
2588                 vlib_add_trace (vm, node, b0, sizeof (*t));
2589               u32 trace_len = (hbh0->length + 1) << 3;
2590               t->next_index = next0;
2591               /* Capture the h-b-h option verbatim */
2592               trace_len =
2593                 trace_len <
2594                 ARRAY_LEN (t->option_data) ? trace_len :
2595                 ARRAY_LEN (t->option_data);
2596               t->trace_len = trace_len;
2597               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2598             }
2599
2600           b0->error = error_node->errors[error0];
2601
2602           /* verify speculative enqueue, maybe switch current next frame */
2603           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2604                                            n_left_to_next, bi0, next0);
2605         }
2606       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2607     }
2608   return frame->n_vectors;
2609 }
2610
2611 /* *INDENT-OFF* */
2612 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2613 {
2614   .name = "ip6-hop-by-hop",
2615   .sibling_of = "ip6-lookup",
2616   .vector_size = sizeof (u32),
2617   .format_trace = format_ip6_hop_by_hop_trace,
2618   .type = VLIB_NODE_TYPE_INTERNAL,
2619   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2620   .error_strings = ip6_hop_by_hop_error_strings,
2621   .n_next_nodes = 0,
2622 };
2623 /* *INDENT-ON* */
2624
2625 static clib_error_t *
2626 ip6_hop_by_hop_init (vlib_main_t * vm)
2627 {
2628   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2629   clib_memset (hm->options, 0, sizeof (hm->options));
2630   clib_memset (hm->trace, 0, sizeof (hm->trace));
2631   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2632   return (0);
2633 }
2634
2635 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2636
2637 #ifndef CLIB_MARCH_VARIANT
2638 void
2639 ip6_hbh_set_next_override (uword next)
2640 {
2641   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2642
2643   hm->next_override = next;
2644 }
2645
2646 int
2647 ip6_hbh_register_option (u8 option,
2648                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2649                                       ip6_hop_by_hop_option_t * opt),
2650                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2651 {
2652   ip6_main_t *im = &ip6_main;
2653   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2654
2655   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2656
2657   /* Already registered */
2658   if (hm->options[option])
2659     return (-1);
2660
2661   hm->options[option] = options;
2662   hm->trace[option] = trace;
2663
2664   /* Set global variable */
2665   im->hbh_enabled = 1;
2666
2667   return (0);
2668 }
2669
2670 int
2671 ip6_hbh_unregister_option (u8 option)
2672 {
2673   ip6_main_t *im = &ip6_main;
2674   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2675
2676   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2677
2678   /* Not registered */
2679   if (!hm->options[option])
2680     return (-1);
2681
2682   hm->options[option] = NULL;
2683   hm->trace[option] = NULL;
2684
2685   /* Disable global knob if this was the last option configured */
2686   int i;
2687   bool found = false;
2688   for (i = 0; i < 256; i++)
2689     {
2690       if (hm->options[option])
2691         {
2692           found = true;
2693           break;
2694         }
2695     }
2696   if (!found)
2697     im->hbh_enabled = 0;
2698
2699   return (0);
2700 }
2701
2702 /* Global IP6 main. */
2703 ip6_main_t ip6_main;
2704 #endif
2705
2706 static clib_error_t *
2707 ip6_lookup_init (vlib_main_t * vm)
2708 {
2709   ip6_main_t *im = &ip6_main;
2710   clib_error_t *error;
2711   uword i;
2712
2713   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2714     return error;
2715
2716   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2717     {
2718       u32 j, i0, i1;
2719
2720       i0 = i / 32;
2721       i1 = i % 32;
2722
2723       for (j = 0; j < i0; j++)
2724         im->fib_masks[i].as_u32[j] = ~0;
2725
2726       if (i1)
2727         im->fib_masks[i].as_u32[i0] =
2728           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2729     }
2730
2731   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2732
2733   if (im->lookup_table_nbuckets == 0)
2734     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2735
2736   im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
2737
2738   if (im->lookup_table_size == 0)
2739     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2740
2741   clib_bihash_init_24_8 (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2742                          "ip6 FIB fwding table",
2743                          im->lookup_table_nbuckets, im->lookup_table_size);
2744   clib_bihash_init_24_8 (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2745                          "ip6 FIB non-fwding table",
2746                          im->lookup_table_nbuckets, im->lookup_table_size);
2747   clib_bihash_init_40_8 (&im->ip6_mtable.ip6_mhash,
2748                          "ip6 mFIB table",
2749                          im->lookup_table_nbuckets, im->lookup_table_size);
2750
2751   /* Create FIB with index 0 and table id of 0. */
2752   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2753                                      FIB_SOURCE_DEFAULT_ROUTE);
2754   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2755                                       MFIB_SOURCE_DEFAULT_ROUTE);
2756
2757   {
2758     pg_node_t *pn;
2759     pn = pg_get_node (ip6_lookup_node.index);
2760     pn->unformat_edit = unformat_pg_ip6_header;
2761   }
2762
2763   /* Unless explicitly configured, don't process HBH options */
2764   im->hbh_enabled = 0;
2765
2766   return error;
2767 }
2768
2769 VLIB_INIT_FUNCTION (ip6_lookup_init);
2770
2771 #ifndef CLIB_MARCH_VARIANT
2772 int
2773 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2774 {
2775   u32 fib_index;
2776
2777   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2778
2779   if (~0 == fib_index)
2780     return VNET_API_ERROR_NO_SUCH_FIB;
2781
2782   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2783                                   flow_hash_config);
2784
2785   return 0;
2786 }
2787 #endif
2788
2789 static clib_error_t *
2790 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2791                               unformat_input_t * input,
2792                               vlib_cli_command_t * cmd)
2793 {
2794   int matched = 0;
2795   u32 table_id = 0;
2796   u32 flow_hash_config = 0;
2797   int rv;
2798
2799   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2800     {
2801       if (unformat (input, "table %d", &table_id))
2802         matched = 1;
2803 #define _(a,v) \
2804     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2805       foreach_flow_hash_bit
2806 #undef _
2807         else
2808         break;
2809     }
2810
2811   if (matched == 0)
2812     return clib_error_return (0, "unknown input `%U'",
2813                               format_unformat_error, input);
2814
2815   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2816   switch (rv)
2817     {
2818     case 0:
2819       break;
2820
2821     case -1:
2822       return clib_error_return (0, "no such FIB table %d", table_id);
2823
2824     default:
2825       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2826       break;
2827     }
2828
2829   return 0;
2830 }
2831
2832 /*?
2833  * Configure the set of IPv6 fields used by the flow hash.
2834  *
2835  * @cliexpar
2836  * @parblock
2837  * Example of how to set the flow hash on a given table:
2838  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2839  *
2840  * Example of display the configured flow hash:
2841  * @cliexstart{show ip6 fib}
2842  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2843  * @::/0
2844  *   unicast-ip6-chain
2845  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2846  *     [0] [@0]: dpo-drop ip6
2847  * fe80::/10
2848  *   unicast-ip6-chain
2849  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2850  *     [0] [@2]: dpo-receive
2851  * ff02::1/128
2852  *   unicast-ip6-chain
2853  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2854  *     [0] [@2]: dpo-receive
2855  * ff02::2/128
2856  *   unicast-ip6-chain
2857  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2858  *     [0] [@2]: dpo-receive
2859  * ff02::16/128
2860  *   unicast-ip6-chain
2861  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2862  *     [0] [@2]: dpo-receive
2863  * ff02::1:ff00:0/104
2864  *   unicast-ip6-chain
2865  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2866  *     [0] [@2]: dpo-receive
2867  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2868  * @::/0
2869  *   unicast-ip6-chain
2870  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2871  *     [0] [@0]: dpo-drop ip6
2872  * @::a:1:1:0:4/126
2873  *   unicast-ip6-chain
2874  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2875  *     [0] [@4]: ipv6-glean: af_packet0
2876  * @::a:1:1:0:7/128
2877  *   unicast-ip6-chain
2878  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2879  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2880  * fe80::/10
2881  *   unicast-ip6-chain
2882  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2883  *     [0] [@2]: dpo-receive
2884  * fe80::fe:3eff:fe3e:9222/128
2885  *   unicast-ip6-chain
2886  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2887  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2888  * ff02::1/128
2889  *   unicast-ip6-chain
2890  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2891  *     [0] [@2]: dpo-receive
2892  * ff02::2/128
2893  *   unicast-ip6-chain
2894  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2895  *     [0] [@2]: dpo-receive
2896  * ff02::16/128
2897  *   unicast-ip6-chain
2898  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2899  *     [0] [@2]: dpo-receive
2900  * ff02::1:ff00:0/104
2901  *   unicast-ip6-chain
2902  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2903  *     [0] [@2]: dpo-receive
2904  * @cliexend
2905  * @endparblock
2906 ?*/
2907 /* *INDENT-OFF* */
2908 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2909 {
2910   .path = "set ip6 flow-hash",
2911   .short_help =
2912   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2913   .function = set_ip6_flow_hash_command_fn,
2914 };
2915 /* *INDENT-ON* */
2916
2917 static clib_error_t *
2918 show_ip6_local_command_fn (vlib_main_t * vm,
2919                            unformat_input_t * input, vlib_cli_command_t * cmd)
2920 {
2921   ip6_main_t *im = &ip6_main;
2922   ip_lookup_main_t *lm = &im->lookup_main;
2923   int i;
2924
2925   vlib_cli_output (vm, "Protocols handled by ip6_local");
2926   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2927     {
2928       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2929         {
2930
2931           u32 node_index = vlib_get_node (vm,
2932                                           ip6_local_node.index)->
2933             next_nodes[lm->local_next_by_ip_protocol[i]];
2934           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2935                            node_index);
2936         }
2937     }
2938   return 0;
2939 }
2940
2941
2942
2943 /*?
2944  * Display the set of protocols handled by the local IPv6 stack.
2945  *
2946  * @cliexpar
2947  * Example of how to display local protocol table:
2948  * @cliexstart{show ip6 local}
2949  * Protocols handled by ip6_local
2950  * 17
2951  * 43
2952  * 58
2953  * 115
2954  * @cliexend
2955 ?*/
2956 /* *INDENT-OFF* */
2957 VLIB_CLI_COMMAND (show_ip6_local, static) =
2958 {
2959   .path = "show ip6 local",
2960   .function = show_ip6_local_command_fn,
2961   .short_help = "show ip6 local",
2962 };
2963 /* *INDENT-ON* */
2964
2965 #ifndef CLIB_MARCH_VARIANT
2966 int
2967 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2968                              u32 table_index)
2969 {
2970   vnet_main_t *vnm = vnet_get_main ();
2971   vnet_interface_main_t *im = &vnm->interface_main;
2972   ip6_main_t *ipm = &ip6_main;
2973   ip_lookup_main_t *lm = &ipm->lookup_main;
2974   vnet_classify_main_t *cm = &vnet_classify_main;
2975   ip6_address_t *if_addr;
2976
2977   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2978     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2979
2980   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2981     return VNET_API_ERROR_NO_SUCH_ENTRY;
2982
2983   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2984   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2985
2986   if_addr = ip6_interface_first_address (ipm, sw_if_index);
2987
2988   if (NULL != if_addr)
2989     {
2990       fib_prefix_t pfx = {
2991         .fp_len = 128,
2992         .fp_proto = FIB_PROTOCOL_IP6,
2993         .fp_addr.ip6 = *if_addr,
2994       };
2995       u32 fib_index;
2996
2997       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2998                                                        sw_if_index);
2999
3000
3001       if (table_index != (u32) ~ 0)
3002         {
3003           dpo_id_t dpo = DPO_INVALID;
3004
3005           dpo_set (&dpo,
3006                    DPO_CLASSIFY,
3007                    DPO_PROTO_IP6,
3008                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3009
3010           fib_table_entry_special_dpo_add (fib_index,
3011                                            &pfx,
3012                                            FIB_SOURCE_CLASSIFY,
3013                                            FIB_ENTRY_FLAG_NONE, &dpo);
3014           dpo_reset (&dpo);
3015         }
3016       else
3017         {
3018           fib_table_entry_special_remove (fib_index,
3019                                           &pfx, FIB_SOURCE_CLASSIFY);
3020         }
3021     }
3022
3023   return 0;
3024 }
3025 #endif
3026
3027 static clib_error_t *
3028 set_ip6_classify_command_fn (vlib_main_t * vm,
3029                              unformat_input_t * input,
3030                              vlib_cli_command_t * cmd)
3031 {
3032   u32 table_index = ~0;
3033   int table_index_set = 0;
3034   u32 sw_if_index = ~0;
3035   int rv;
3036
3037   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3038     {
3039       if (unformat (input, "table-index %d", &table_index))
3040         table_index_set = 1;
3041       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3042                          vnet_get_main (), &sw_if_index))
3043         ;
3044       else
3045         break;
3046     }
3047
3048   if (table_index_set == 0)
3049     return clib_error_return (0, "classify table-index must be specified");
3050
3051   if (sw_if_index == ~0)
3052     return clib_error_return (0, "interface / subif must be specified");
3053
3054   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3055
3056   switch (rv)
3057     {
3058     case 0:
3059       break;
3060
3061     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3062       return clib_error_return (0, "No such interface");
3063
3064     case VNET_API_ERROR_NO_SUCH_ENTRY:
3065       return clib_error_return (0, "No such classifier table");
3066     }
3067   return 0;
3068 }
3069
3070 /*?
3071  * Assign a classification table to an interface. The classification
3072  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3073  * commands. Once the table is create, use this command to filter packets
3074  * on an interface.
3075  *
3076  * @cliexpar
3077  * Example of how to assign a classification table to an interface:
3078  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3079 ?*/
3080 /* *INDENT-OFF* */
3081 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3082 {
3083   .path = "set ip6 classify",
3084   .short_help =
3085   "set ip6 classify intfc <interface> table-index <classify-idx>",
3086   .function = set_ip6_classify_command_fn,
3087 };
3088 /* *INDENT-ON* */
3089
3090 static clib_error_t *
3091 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3092 {
3093   ip6_main_t *im = &ip6_main;
3094   uword heapsize = 0;
3095   u32 tmp;
3096   u32 nbuckets = 0;
3097
3098   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3099     {
3100       if (unformat (input, "hash-buckets %d", &tmp))
3101         nbuckets = tmp;
3102       else if (unformat (input, "heap-size %U",
3103                          unformat_memory_size, &heapsize))
3104         ;
3105       else
3106         return clib_error_return (0, "unknown input '%U'",
3107                                   format_unformat_error, input);
3108     }
3109
3110   im->lookup_table_nbuckets = nbuckets;
3111   im->lookup_table_size = heapsize;
3112
3113   return 0;
3114 }
3115
3116 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3117
3118 /*
3119  * fd.io coding-style-patch-verification: ON
3120  *
3121  * Local Variables:
3122  * eval: (c-set-style "gnu")
3123  * End:
3124  */