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/ipsec/ipsec_tun.h>
  59 #include <vnet/interface_output.h>
  60
  61 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  62 #define OI_DECAP   0x80000000
  63
  64 static void
  65 ip6_add_interface_prefix_routes (ip6_main_t * im,
  66                                  u32 sw_if_index,
  67                                  u32 fib_index,
  68                                  ip6_address_t * address, u32 address_length)
  69 {
  70   ip_lookup_main_t *lm = &im->lookup_main;
  71   ip_interface_prefix_t *if_prefix;
  72
  73   /* *INDENT-OFF* */
  74   ip_interface_prefix_key_t key = {
  75     .prefix = {
  76       .fp_len = address_length,
  77       .fp_proto = FIB_PROTOCOL_IP6,
  78       .fp_addr.ip6 = {
  79         .as_u64 = {
  80           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
  81           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
  82         },
  83       },
  84     },
  85     .sw_if_index = sw_if_index,
  86   };
  87   /* *INDENT-ON* */
  88
  89   /* If prefix already set on interface, just increment ref count & return */
  90   if_prefix = ip_get_interface_prefix (lm, &key);
  91   if (if_prefix)
  92     {
  93       if_prefix->ref_count += 1;
  94       return;
  95     }
  96
  97   /* New prefix - allocate a pool entry, initialize it, add to the hash */
  98   pool_get (lm->if_prefix_pool, if_prefix);
  99   if_prefix->ref_count = 1;
 100   clib_memcpy (&if_prefix->key, &key, sizeof (key));
 101   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 102              if_prefix - lm->if_prefix_pool, 0 /* old value */ );
 103
 104   /* length < 128 - add glean */
 105   if (address_length < 128)
 106     {
 107       /* set the glean route for the prefix */
 108       fib_table_entry_update_one_path (fib_index, &key.prefix,
 109                                        FIB_SOURCE_INTERFACE,
 110                                        (FIB_ENTRY_FLAG_CONNECTED |
 111                                         FIB_ENTRY_FLAG_ATTACHED),
 112                                        DPO_PROTO_IP6,
 113                                        /* No next-hop address */
 114                                        NULL, sw_if_index,
 115                                        /* invalid FIB index */
 116                                        ~0, 1,
 117                                        /* no out-label stack */
 118                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
 119     }
 120 }
 121
 122 static void
 123 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 124                           ip6_main_t * im, u32 fib_index,
 125                           ip_interface_address_t * a)
 126 {
 127   ip_lookup_main_t *lm = &im->lookup_main;
 128   ip6_address_t *address = ip_interface_address_get_address (lm, a);
 129   fib_prefix_t pfx = {
 130     .fp_len = a->address_length,
 131     .fp_proto = FIB_PROTOCOL_IP6,
 132     .fp_addr.ip6 = *address,
 133   };
 134
 135   /* set special routes for the prefix if needed */
 136   ip6_add_interface_prefix_routes (im, sw_if_index, fib_index,
 137                                    address, a->address_length);
 138
 139   pfx.fp_len = 128;
 140   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 141     {
 142       u32 classify_table_index =
 143         lm->classify_table_index_by_sw_if_index[sw_if_index];
 144       if (classify_table_index != (u32) ~ 0)
 145         {
 146           dpo_id_t dpo = DPO_INVALID;
 147
 148           dpo_set (&dpo,
 149                    DPO_CLASSIFY,
 150                    DPO_PROTO_IP6,
 151                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 152
 153           fib_table_entry_special_dpo_add (fib_index,
 154                                            &pfx,
 155                                            FIB_SOURCE_CLASSIFY,
 156                                            FIB_ENTRY_FLAG_NONE, &dpo);
 157           dpo_reset (&dpo);
 158         }
 159     }
 160
 161   fib_table_entry_update_one_path (fib_index, &pfx,
 162                                    FIB_SOURCE_INTERFACE,
 163                                    (FIB_ENTRY_FLAG_CONNECTED |
 164                                     FIB_ENTRY_FLAG_LOCAL),
 165                                    DPO_PROTO_IP6,
 166                                    &pfx.fp_addr,
 167                                    sw_if_index, ~0,
 168                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 169 }
 170
 171 static void
 172 ip6_del_interface_prefix_routes (ip6_main_t * im,
 173                                  u32 sw_if_index,
 174                                  u32 fib_index,
 175                                  ip6_address_t * address, u32 address_length)
 176 {
 177   ip_lookup_main_t *lm = &im->lookup_main;
 178   ip_interface_prefix_t *if_prefix;
 179
 180   /* *INDENT-OFF* */
 181   ip_interface_prefix_key_t key = {
 182     .prefix = {
 183       .fp_len = address_length,
 184       .fp_proto = FIB_PROTOCOL_IP6,
 185       .fp_addr.ip6 = {
 186         .as_u64 = {
 187           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
 188           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
 189         },
 190       },
 191     },
 192     .sw_if_index = sw_if_index,
 193   };
 194   /* *INDENT-ON* */
 195
 196   if_prefix = ip_get_interface_prefix (lm, &key);
 197   if (!if_prefix)
 198     {
 199       clib_warning ("Prefix not found while deleting %U",
 200                     format_ip4_address_and_length, address, address_length);
 201       return;
 202     }
 203
 204   /* If not deleting last intf addr in prefix, decrement ref count & return */
 205   if_prefix->ref_count -= 1;
 206   if (if_prefix->ref_count > 0)
 207     return;
 208
 209   /* length <= 128, delete glean route */
 210   if (address_length <= 128)
 211     {
 212       /* remove glean route for prefix */
 213       fib_table_entry_delete (fib_index, &key.prefix, FIB_SOURCE_INTERFACE);
 214     }
 215
 216   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */ );
 217   pool_put (lm->if_prefix_pool, if_prefix);
 218 }
 219
 220 static void
 221 ip6_del_interface_routes (u32 sw_if_index, ip6_main_t * im,
 222                           u32 fib_index,
 223                           ip6_address_t * address, u32 address_length)
 224 {
 225   fib_prefix_t pfx = {
 226     .fp_len = 128,
 227     .fp_proto = FIB_PROTOCOL_IP6,
 228     .fp_addr.ip6 = *address,
 229   };
 230
 231   /* delete special routes for the prefix if needed */
 232   ip6_del_interface_prefix_routes (im, sw_if_index, fib_index,
 233                                    address, address_length);
 234
 235   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 236 }
 237
 238 #ifndef CLIB_MARCH_VARIANT
 239 void
 240 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 241 {
 242   ip6_main_t *im = &ip6_main;
 243   vnet_main_t *vnm = vnet_get_main ();
 244   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 245
 246   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 247
 248   /*
 249    * enable/disable only on the 1<->0 transition
 250    */
 251   if (is_enable)
 252     {
 253       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 254         return;
 255     }
 256   else
 257     {
 258       /* The ref count is 0 when an address is removed from an interface that has
 259        * no address - this is not a ciritical error */
 260       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 261           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 262         return;
 263     }
 264
 265   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 266                                !is_enable, 0, 0);
 267
 268   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 269                                sw_if_index, !is_enable, 0, 0);
 270
 271   if (is_enable)
 272     hi->l3_if_count++;
 273   else if (hi->l3_if_count)
 274     hi->l3_if_count--;
 275 }
 276
 277 /* get first interface address */
 278 ip6_address_t *
 279 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 280 {
 281   ip_lookup_main_t *lm = &im->lookup_main;
 282   ip_interface_address_t *ia = 0;
 283   ip6_address_t *result = 0;
 284
 285   /* *INDENT-OFF* */
 286   foreach_ip_interface_address (lm, ia, sw_if_index,
 287                                 1 /* honor unnumbered */,
 288   ({
 289     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 290     result = a;
 291     break;
 292   }));
 293   /* *INDENT-ON* */
 294   return result;
 295 }
 296
 297 clib_error_t *
 298 ip6_add_del_interface_address (vlib_main_t * vm,
 299                                u32 sw_if_index,
 300                                ip6_address_t * address,
 301                                u32 address_length, u32 is_del)
 302 {
 303   vnet_main_t *vnm = vnet_get_main ();
 304   ip6_main_t *im = &ip6_main;
 305   ip_lookup_main_t *lm = &im->lookup_main;
 306   clib_error_t *error = NULL;
 307   u32 if_address_index;
 308   ip6_address_fib_t ip6_af, *addr_fib = 0;
 309   const ip6_address_t *ll_addr;
 310
 311   /* local0 interface doesn't support IP addressing */
 312   if (sw_if_index == 0)
 313     {
 314       return
 315         clib_error_create ("local0 interface doesn't support IP addressing");
 316     }
 317
 318   if (ip6_address_is_link_local_unicast (address))
 319     {
 320       if (address_length != 128)
 321         {
 322           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 323           return
 324             clib_error_create
 325             ("prefix length of link-local address must be 128");
 326         }
 327       if (!is_del)
 328         {
 329           int rv;
 330
 331           rv = ip6_link_set_local_address (sw_if_index, address);
 332
 333           if (rv)
 334             {
 335               vnm->api_errno = rv;
 336               return clib_error_create ("address not assignable");
 337             }
 338         }
 339       else
 340         {
 341           ll_addr = ip6_get_link_local_address (sw_if_index);
 342           if (ip6_address_is_equal (ll_addr, address))
 343             {
 344               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 345               return clib_error_create ("address not deletable");
 346             }
 347           else
 348             {
 349               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 350               return clib_error_create ("address not found");
 351             }
 352         }
 353
 354       return (NULL);
 355     }
 356
 357   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 358   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 359
 360   ip6_addr_fib_init (&ip6_af, address,
 361                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 362   vec_add1 (addr_fib, ip6_af);
 363
 364   /* *INDENT-OFF* */
 365   if (!is_del)
 366     {
 367       /* When adding an address check that it does not conflict
 368          with an existing address on any interface in this table. */
 369       ip_interface_address_t *ia;
 370       vnet_sw_interface_t *sif;
 371
 372       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 373       ({
 374           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 375               im->fib_index_by_sw_if_index[sif->sw_if_index])
 376             {
 377               foreach_ip_interface_address
 378                 (&im->lookup_main, ia, sif->sw_if_index,
 379                  0 /* honor unnumbered */ ,
 380                  ({
 381                    ip6_address_t * x =
 382                      ip_interface_address_get_address
 383                      (&im->lookup_main, ia);
 384
 385                    if (ip6_destination_matches_route
 386                        (im, address, x, ia->address_length) ||
 387                        ip6_destination_matches_route (im,
 388                                                       x,
 389                                                       address,
 390                                                       address_length))
 391                      {
 392                        /* an intf may have >1 addr from the same prefix */
 393                        if ((sw_if_index == sif->sw_if_index) &&
 394                            (ia->address_length == address_length) &&
 395                            !ip6_address_is_equal (x, address))
 396                          continue;
 397
 398                        if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 399                          /* if the address we're comparing against is stale
 400                           * then the CP has not added this one back yet, maybe
 401                           * it never will, so we have to assume it won't and
 402                           * ignore it. if it does add it back, then it will fail
 403                           * because this one is now present */
 404                          continue;
 405
 406                        /* error if the length or intf was different */
 407                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 408                        error =  clib_error_create
 409                          ("failed to add %U which conflicts with %U for interface %U",
 410                           format_ip6_address_and_length, address,
 411                           address_length,
 412                           format_ip6_address_and_length, x,
 413                           ia->address_length,
 414                           format_vnet_sw_if_index_name, vnm,
 415                           sif->sw_if_index);
 416                        goto done;
 417                      }
 418                  }));
 419             }
 420       }));
 421     }
 422   /* *INDENT-ON* */
 423
 424   if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
 425
 426   if (is_del)
 427     {
 428       if (~0 == if_address_index)
 429         {
 430           vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 431           error = clib_error_create ("%U not found for interface %U",
 432                                      lm->format_address_and_length,
 433                                      addr_fib, address_length,
 434                                      format_vnet_sw_if_index_name, vnm,
 435                                      sw_if_index);
 436           goto done;
 437         }
 438
 439       error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
 440                                         address_length, sw_if_index);
 441       if (error)
 442         goto done;
 443     }
 444   else
 445     {
 446       if (~0 != if_address_index)
 447         {
 448           ip_interface_address_t *ia;
 449
 450           ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
 451
 452           if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 453             {
 454               if (ia->sw_if_index == sw_if_index)
 455                 {
 456                   /* re-adding an address during the replace action.
 457                    * consdier this the update. clear the flag and
 458                    * we're done */
 459                   ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
 460                   goto done;
 461                 }
 462               else
 463                 {
 464                   /* The prefix is moving from one interface to another.
 465                    * delete the stale and add the new */
 466                   ip6_add_del_interface_address (vm,
 467                                                  ia->sw_if_index,
 468                                                  address, address_length, 1);
 469                   ia = NULL;
 470                   error = ip_interface_address_add (lm, sw_if_index,
 471                                                     addr_fib, address_length,
 472                                                     &if_address_index);
 473                 }
 474             }
 475           else
 476             {
 477               vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 478               error = clib_error_create
 479                 ("Prefix %U already found on interface %U",
 480                  lm->format_address_and_length, addr_fib, address_length,
 481                  format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
 482             }
 483         }
 484       else
 485         error = ip_interface_address_add (lm, sw_if_index,
 486                                           addr_fib, address_length,
 487                                           &if_address_index);
 488     }
 489
 490   if (error)
 491     goto done;
 492
 493   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 494   if (!is_del)
 495     ip6_link_enable (sw_if_index, NULL);
 496
 497   /* intf addr routes are added/deleted on admin up/down */
 498   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 499     {
 500       if (is_del)
 501         ip6_del_interface_routes (sw_if_index,
 502                                   im, ip6_af.fib_index, address,
 503                                   address_length);
 504       else
 505         ip6_add_interface_routes (vnm, sw_if_index,
 506                                   im, ip6_af.fib_index,
 507                                   pool_elt_at_index (lm->if_address_pool,
 508                                                      if_address_index));
 509     }
 510
 511   ip6_add_del_interface_address_callback_t *cb;
 512   vec_foreach (cb, im->add_del_interface_address_callbacks)
 513     cb->function (im, cb->function_opaque, sw_if_index,
 514                   address, address_length, if_address_index, is_del);
 515
 516   if (is_del)
 517     ip6_link_disable (sw_if_index);
 518
 519 done:
 520   vec_free (addr_fib);
 521   return error;
 522 }
 523
 524 #endif
 525
 526 static clib_error_t *
 527 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 528 {
 529   ip6_main_t *im = &ip6_main;
 530   ip_interface_address_t *ia;
 531   ip6_address_t *a;
 532   u32 is_admin_up, fib_index;
 533
 534   /* Fill in lookup tables with default table (0). */
 535   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 536
 537   vec_validate_init_empty (im->
 538                            lookup_main.if_address_pool_index_by_sw_if_index,
 539                            sw_if_index, ~0);
 540
 541   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 542
 543   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 544
 545   /* *INDENT-OFF* */
 546   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 547                                 0 /* honor unnumbered */,
 548   ({
 549     a = ip_interface_address_get_address (&im->lookup_main, ia);
 550     if (is_admin_up)
 551       ip6_add_interface_routes (vnm, sw_if_index,
 552                                 im, fib_index,
 553                                 ia);
 554     else
 555       ip6_del_interface_routes (sw_if_index, im, fib_index,
 556                                 a, ia->address_length);
 557   }));
 558   /* *INDENT-ON* */
 559
 560   return 0;
 561 }
 562
 563 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 564
 565 /* Built-in ip6 unicast rx feature path definition */
 566 /* *INDENT-OFF* */
 567 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 568 {
 569   .arc_name  = "ip6-unicast",
 570   .start_nodes = VNET_FEATURES ("ip6-input"),
 571   .last_in_arc = "ip6-lookup",
 572   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 573 };
 574
 575 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 576 {
 577   .arc_name = "ip6-unicast",
 578   .node_name = "ip6-flow-classify",
 579   .runs_before = VNET_FEATURES ("ip6-inacl"),
 580 };
 581
 582 VNET_FEATURE_INIT (ip6_inacl, static) =
 583 {
 584   .arc_name = "ip6-unicast",
 585   .node_name = "ip6-inacl",
 586   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 587 };
 588
 589 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 590 {
 591   .arc_name = "ip6-unicast",
 592   .node_name = "ip6-policer-classify",
 593   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 594 };
 595
 596 VNET_FEATURE_INIT (ip6_ipsec, static) =
 597 {
 598   .arc_name = "ip6-unicast",
 599   .node_name = "ipsec6-input-feature",
 600   .runs_before = VNET_FEATURES ("l2tp-decap"),
 601 };
 602
 603 VNET_FEATURE_INIT (ip6_l2tp, static) =
 604 {
 605   .arc_name = "ip6-unicast",
 606   .node_name = "l2tp-decap",
 607   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 608 };
 609
 610 VNET_FEATURE_INIT (ip6_vpath, static) =
 611 {
 612   .arc_name = "ip6-unicast",
 613   .node_name = "vpath-input-ip6",
 614   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 615 };
 616
 617 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 618 {
 619   .arc_name = "ip6-unicast",
 620   .node_name = "ip6-vxlan-bypass",
 621   .runs_before = VNET_FEATURES ("ip6-lookup"),
 622 };
 623
 624 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 625 {
 626   .arc_name = "ip6-unicast",
 627   .node_name = "ip6-not-enabled",
 628   .runs_before = VNET_FEATURES ("ip6-lookup"),
 629 };
 630
 631 VNET_FEATURE_INIT (ip6_lookup, static) =
 632 {
 633   .arc_name = "ip6-unicast",
 634   .node_name = "ip6-lookup",
 635   .runs_before = 0,  /*last feature*/
 636 };
 637
 638 /* Built-in ip6 multicast rx feature path definition (none now) */
 639 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 640 {
 641   .arc_name  = "ip6-multicast",
 642   .start_nodes = VNET_FEATURES ("ip6-input"),
 643   .last_in_arc = "ip6-mfib-forward-lookup",
 644   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 645 };
 646
 647 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 648   .arc_name = "ip6-multicast",
 649   .node_name = "vpath-input-ip6",
 650   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 651 };
 652
 653 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 654   .arc_name = "ip6-multicast",
 655   .node_name = "ip6-not-enabled",
 656   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 657 };
 658
 659 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 660   .arc_name = "ip6-multicast",
 661   .node_name = "ip6-mfib-forward-lookup",
 662   .runs_before = 0, /* last feature */
 663 };
 664
 665 /* Built-in ip4 tx feature path definition */
 666 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 667 {
 668   .arc_name  = "ip6-output",
 669   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 670   .last_in_arc = "interface-output",
 671   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 672 };
 673
 674 VNET_FEATURE_INIT (ip6_outacl, static) = {
 675   .arc_name = "ip6-output",
 676   .node_name = "ip6-outacl",
 677   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 678 };
 679
 680 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 681   .arc_name = "ip6-output",
 682   .node_name = "ipsec6-output-feature",
 683   .runs_before = VNET_FEATURES ("interface-output"),
 684 };
 685
 686 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 687   .arc_name = "ip6-output",
 688   .node_name = "interface-output",
 689   .runs_before = 0, /* not before any other features */
 690 };
 691 /* *INDENT-ON* */
 692
 693 static clib_error_t *
 694 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 695 {
 696   ip6_main_t *im = &ip6_main;
 697
 698   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 699   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 700
 701   if (!is_add)
 702     {
 703       /* Ensure that IPv6 is disabled */
 704       ip6_main_t *im6 = &ip6_main;
 705       ip_lookup_main_t *lm6 = &im6->lookup_main;
 706       ip_interface_address_t *ia = 0;
 707       ip6_address_t *address;
 708       vlib_main_t *vm = vlib_get_main ();
 709
 710       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 711       /* *INDENT-OFF* */
 712       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 713       ({
 714         address = ip_interface_address_get_address (lm6, ia);
 715         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 716       }));
 717       /* *INDENT-ON* */
 718       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 719     }
 720
 721   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 722                                is_add, 0, 0);
 723
 724   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 725                                sw_if_index, is_add, 0, 0);
 726
 727   return /* no error */ 0;
 728 }
 729
 730 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 731
 732 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 733                                 vlib_node_runtime_t * node,
 734                                 vlib_frame_t * frame)
 735 {
 736   return ip6_lookup_inline (vm, node, frame);
 737 }
 738
 739 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 740
 741 /* *INDENT-OFF* */
 742 VLIB_REGISTER_NODE (ip6_lookup_node) =
 743 {
 744   .name = "ip6-lookup",
 745   .vector_size = sizeof (u32),
 746   .format_trace = format_ip6_lookup_trace,
 747   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 748   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 749 };
 750 /* *INDENT-ON* */
 751
 752 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 753                                       vlib_node_runtime_t * node,
 754                                       vlib_frame_t * frame)
 755 {
 756   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 757   u32 n_left, *from;
 758   u32 thread_index = vm->thread_index;
 759   ip6_main_t *im = &ip6_main;
 760   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 761   u16 nexts[VLIB_FRAME_SIZE], *next;
 762
 763   from = vlib_frame_vector_args (frame);
 764   n_left = frame->n_vectors;
 765   next = nexts;
 766
 767   vlib_get_buffers (vm, from, bufs, n_left);
 768
 769   while (n_left >= 4)
 770     {
 771       const load_balance_t *lb0, *lb1;
 772       const ip6_header_t *ip0, *ip1;
 773       u32 lbi0, hc0, lbi1, hc1;
 774       const dpo_id_t *dpo0, *dpo1;
 775
 776       /* Prefetch next iteration. */
 777       {
 778         vlib_prefetch_buffer_header (b[2], STORE);
 779         vlib_prefetch_buffer_header (b[3], STORE);
 780
 781         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 782         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 783       }
 784
 785       ip0 = vlib_buffer_get_current (b[0]);
 786       ip1 = vlib_buffer_get_current (b[1]);
 787       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 788       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 789
 790       lb0 = load_balance_get (lbi0);
 791       lb1 = load_balance_get (lbi1);
 792
 793       /*
 794        * this node is for via FIBs we can re-use the hash value from the
 795        * to node if present.
 796        * We don't want to use the same hash value at each level in the recursion
 797        * graph as that would lead to polarisation
 798        */
 799       hc0 = hc1 = 0;
 800
 801       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 802         {
 803           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 804             {
 805               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 806                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 807             }
 808           else
 809             {
 810               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 811                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 812             }
 813           dpo0 = load_balance_get_fwd_bucket
 814             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 815         }
 816       else
 817         {
 818           dpo0 = load_balance_get_bucket_i (lb0, 0);
 819         }
 820       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 821         {
 822           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 823             {
 824               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 825                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 826             }
 827           else
 828             {
 829               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 830                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 831             }
 832           dpo1 = load_balance_get_fwd_bucket
 833             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 834         }
 835       else
 836         {
 837           dpo1 = load_balance_get_bucket_i (lb1, 0);
 838         }
 839
 840       next[0] = dpo0->dpoi_next_node;
 841       next[1] = dpo1->dpoi_next_node;
 842
 843       /* Only process the HBH Option Header if explicitly configured to do so */
 844       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 845         {
 846           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 847             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 848         }
 849       /* Only process the HBH Option Header if explicitly configured to do so */
 850       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 851         {
 852           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 853             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 854         }
 855
 856       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 857       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 858
 859       vlib_increment_combined_counter
 860         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 861       vlib_increment_combined_counter
 862         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 863
 864       b += 2;
 865       next += 2;
 866       n_left -= 2;
 867     }
 868
 869   while (n_left > 0)
 870     {
 871       const load_balance_t *lb0;
 872       const ip6_header_t *ip0;
 873       const dpo_id_t *dpo0;
 874       u32 lbi0, hc0;
 875
 876       ip0 = vlib_buffer_get_current (b[0]);
 877       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 878
 879       lb0 = load_balance_get (lbi0);
 880
 881       hc0 = 0;
 882       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 883         {
 884           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 885             {
 886               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 887                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 888             }
 889           else
 890             {
 891               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 892                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 893             }
 894           dpo0 = load_balance_get_fwd_bucket
 895             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 896         }
 897       else
 898         {
 899           dpo0 = load_balance_get_bucket_i (lb0, 0);
 900         }
 901
 902       next[0] = dpo0->dpoi_next_node;
 903       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 904
 905       /* Only process the HBH Option Header if explicitly configured to do so */
 906       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 907         {
 908           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 909             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 910         }
 911
 912       vlib_increment_combined_counter
 913         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 914
 915       b += 1;
 916       next += 1;
 917       n_left -= 1;
 918     }
 919
 920   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 921
 922   if (node->flags & VLIB_NODE_FLAG_TRACE)
 923     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 924
 925   return frame->n_vectors;
 926 }
 927
 928 /* *INDENT-OFF* */
 929 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 930 {
 931   .name = "ip6-load-balance",
 932   .vector_size = sizeof (u32),
 933   .sibling_of = "ip6-lookup",
 934   .format_trace = format_ip6_lookup_trace,
 935 };
 936 /* *INDENT-ON* */
 937
 938 typedef struct
 939 {
 940   /* Adjacency taken. */
 941   u32 adj_index;
 942   u32 flow_hash;
 943   u32 fib_index;
 944
 945   /* Packet data, possibly *after* rewrite. */
 946   u8 packet_data[128 - 1 * sizeof (u32)];
 947 }
 948 ip6_forward_next_trace_t;
 949
 950 #ifndef CLIB_MARCH_VARIANT
 951 u8 *
 952 format_ip6_forward_next_trace (u8 * s, va_list * args)
 953 {
 954   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 955   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 956   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 957   u32 indent = format_get_indent (s);
 958
 959   s = format (s, "%U%U",
 960               format_white_space, indent,
 961               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 962   return s;
 963 }
 964 #endif
 965
 966 static u8 *
 967 format_ip6_lookup_trace (u8 * s, va_list * args)
 968 {
 969   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 970   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 971   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 972   u32 indent = format_get_indent (s);
 973
 974   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 975               t->fib_index, t->adj_index, t->flow_hash);
 976   s = format (s, "\n%U%U",
 977               format_white_space, indent,
 978               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 979   return s;
 980 }
 981
 982
 983 static u8 *
 984 format_ip6_rewrite_trace (u8 * s, va_list * args)
 985 {
 986   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 987   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 988   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 989   u32 indent = format_get_indent (s);
 990
 991   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 992               t->fib_index, t->adj_index, format_ip_adjacency,
 993               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 994   s = format (s, "\n%U%U",
 995               format_white_space, indent,
 996               format_ip_adjacency_packet_data,
 997               t->packet_data, sizeof (t->packet_data));
 998   return s;
 999 }
1000
1001 /* Common trace function for all ip6-forward next nodes. */
1002 #ifndef CLIB_MARCH_VARIANT
1003 void
1004 ip6_forward_next_trace (vlib_main_t * vm,
1005                         vlib_node_runtime_t * node,
1006                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1007 {
1008   u32 *from, n_left;
1009   ip6_main_t *im = &ip6_main;
1010
1011   n_left = frame->n_vectors;
1012   from = vlib_frame_vector_args (frame);
1013
1014   while (n_left >= 4)
1015     {
1016       u32 bi0, bi1;
1017       vlib_buffer_t *b0, *b1;
1018       ip6_forward_next_trace_t *t0, *t1;
1019
1020       /* Prefetch next iteration. */
1021       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1022       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1023
1024       bi0 = from[0];
1025       bi1 = from[1];
1026
1027       b0 = vlib_get_buffer (vm, bi0);
1028       b1 = vlib_get_buffer (vm, bi1);
1029
1030       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1031         {
1032           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1033           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1034           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1035           t0->fib_index =
1036             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1037              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1038             vec_elt (im->fib_index_by_sw_if_index,
1039                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1040
1041           clib_memcpy_fast (t0->packet_data,
1042                             vlib_buffer_get_current (b0),
1043                             sizeof (t0->packet_data));
1044         }
1045       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1046         {
1047           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1048           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1049           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1050           t1->fib_index =
1051             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1052              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1053             vec_elt (im->fib_index_by_sw_if_index,
1054                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1055
1056           clib_memcpy_fast (t1->packet_data,
1057                             vlib_buffer_get_current (b1),
1058                             sizeof (t1->packet_data));
1059         }
1060       from += 2;
1061       n_left -= 2;
1062     }
1063
1064   while (n_left >= 1)
1065     {
1066       u32 bi0;
1067       vlib_buffer_t *b0;
1068       ip6_forward_next_trace_t *t0;
1069
1070       bi0 = from[0];
1071
1072       b0 = vlib_get_buffer (vm, bi0);
1073
1074       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1075         {
1076           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1077           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1078           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1079           t0->fib_index =
1080             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1081              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1082             vec_elt (im->fib_index_by_sw_if_index,
1083                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1084
1085           clib_memcpy_fast (t0->packet_data,
1086                             vlib_buffer_get_current (b0),
1087                             sizeof (t0->packet_data));
1088         }
1089       from += 1;
1090       n_left -= 1;
1091     }
1092 }
1093
1094 /* Compute TCP/UDP/ICMP6 checksum in software. */
1095 u16
1096 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1097                                    ip6_header_t * ip0, int *bogus_lengthp)
1098 {
1099   ip_csum_t sum0 = 0;
1100   u16 payload_length, payload_length_host_byte_order;
1101   u32 i;
1102   u32 headers_size = sizeof (ip0[0]);
1103   u8 *data_this_buffer;
1104   u8 next_hdr = ip0->protocol;
1105
1106   ASSERT (bogus_lengthp);
1107   *bogus_lengthp = 0;
1108
1109   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1110   data_this_buffer = (u8 *) (ip0 + 1);
1111   payload_length = ip0->payload_length;
1112
1113   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1114    * or UDP-Ping packets */
1115   if (PREDICT_FALSE (next_hdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1116     {
1117       u32 skip_bytes;
1118       ip6_hop_by_hop_ext_t *ext_hdr =
1119         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1120
1121       /* validate really icmp6 next */
1122       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1123               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1124
1125       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1126       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1127
1128       payload_length_host_byte_order -= skip_bytes;
1129       headers_size += skip_bytes;
1130
1131       /* pseudo-header adjustments:
1132        *   exclude ext header bytes from payload length
1133        *   use payload IP proto rather than ext header IP proto
1134        */
1135       payload_length = clib_host_to_net_u16 (payload_length_host_byte_order);
1136       next_hdr = ext_hdr->next_hdr;
1137     }
1138
1139   /* Initialize checksum with ip pseudo-header. */
1140   sum0 = payload_length + clib_host_to_net_u16 (next_hdr);
1141
1142   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1143     {
1144       sum0 = ip_csum_with_carry
1145         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1146       sum0 = ip_csum_with_carry
1147         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1148     }
1149
1150   if (p0)
1151     return ip_calculate_l4_checksum (vm, p0, sum0,
1152                                      payload_length_host_byte_order,
1153                                      (u8 *) ip0, headers_size, NULL);
1154   else
1155     return ip_calculate_l4_checksum (vm, 0, sum0,
1156                                      payload_length_host_byte_order, NULL, 0,
1157                                      data_this_buffer);
1158 }
1159
1160 u32
1161 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1162 {
1163   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1164   udp_header_t *udp0;
1165   u16 sum16;
1166   int bogus_length;
1167
1168   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1169   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1170           || ip0->protocol == IP_PROTOCOL_ICMP6
1171           || ip0->protocol == IP_PROTOCOL_UDP
1172           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1173
1174   udp0 = (void *) (ip0 + 1);
1175   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1176     {
1177       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1178                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1179       return p0->flags;
1180     }
1181
1182   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1183
1184   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1185                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1186
1187   return p0->flags;
1188 }
1189 #endif
1190
1191 /**
1192  * @brief returns number of links on which src is reachable.
1193  */
1194 always_inline int
1195 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1196 {
1197   const load_balance_t *lb0;
1198   index_t lbi;
1199   u32 fib_index;
1200
1201   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1202                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1203   fib_index =
1204     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1205     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1206
1207   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1208   lb0 = load_balance_get (lbi);
1209
1210   return (fib_urpf_check_size (lb0->lb_urpf));
1211 }
1212
1213 always_inline u8
1214 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1215                            u32 * udp_offset0)
1216 {
1217   u32 proto0;
1218   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1219   if (proto0 != IP_PROTOCOL_UDP)
1220     {
1221       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1222       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1223     }
1224   return proto0;
1225 }
1226
1227 /* *INDENT-OFF* */
1228 VNET_FEATURE_ARC_INIT (ip6_local) =
1229 {
1230   .arc_name  = "ip6-local",
1231   .start_nodes = VNET_FEATURES ("ip6-local"),
1232 };
1233 /* *INDENT-ON* */
1234
1235 static_always_inline u8
1236 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1237 {
1238
1239   u16 payload_length_host_byte_order;
1240   u32 n_this_buffer, n_bytes_left;
1241   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1242   u32 headers_size = sizeof (ip0[0]);
1243   u8 *data_this_buffer;
1244
1245
1246   data_this_buffer = (u8 *) (ip0 + 1);
1247
1248   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1249
1250   /* validate really icmp6 next */
1251
1252   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1253       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1254     return 0;
1255
1256
1257   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1258   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1259
1260
1261   u32 n_ip_bytes_this_buffer =
1262     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1263   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1264     {
1265       n_this_buffer = p0->current_length > headers_size ?
1266         n_ip_bytes_this_buffer - headers_size : 0;
1267     }
1268
1269   n_bytes_left -= n_this_buffer;
1270   n_bytes_left -= p0->total_length_not_including_first_buffer;
1271
1272   if (n_bytes_left == 0)
1273     return 0;
1274   else
1275     return 1;
1276 }
1277
1278
1279 always_inline uword
1280 ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1281                   vlib_frame_t * frame, int head_of_feature_arc)
1282 {
1283   ip6_main_t *im = &ip6_main;
1284   ip_lookup_main_t *lm = &im->lookup_main;
1285   u32 *from, n_left_from;
1286   vlib_node_runtime_t *error_node =
1287     vlib_node_get_runtime (vm, ip6_input_node.index);
1288   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1289   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1290   u16 nexts[VLIB_FRAME_SIZE], *next;
1291
1292   from = vlib_frame_vector_args (frame);
1293   n_left_from = frame->n_vectors;
1294
1295   if (node->flags & VLIB_NODE_FLAG_TRACE)
1296     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1297
1298   vlib_get_buffers (vm, from, bufs, n_left_from);
1299   b = bufs;
1300   next = nexts;
1301
1302   while (n_left_from > 2)
1303     {
1304       /* Prefetch next iteration. */
1305       if (n_left_from >= 6)
1306         {
1307           vlib_prefetch_buffer_header (b[4], STORE);
1308           vlib_prefetch_buffer_header (b[5], STORE);
1309           vlib_prefetch_buffer_data (b[2], LOAD);
1310           vlib_prefetch_buffer_data (b[3], LOAD);
1311         }
1312
1313       u8 error[2];
1314       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1315       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1316
1317       ip6_header_t *ip[2];
1318       ip[0] = vlib_buffer_get_current (b[0]);
1319       ip[1] = vlib_buffer_get_current (b[1]);
1320
1321       if (head_of_feature_arc)
1322         {
1323           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1324           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1325
1326           u8 type[2];
1327           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1328           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1329
1330           u32 flags[2];
1331           flags[0] = b[0]->flags;
1332           flags[1] = b[1]->flags;
1333
1334           u32 good_l4_csum[2];
1335           good_l4_csum[0] =
1336             flags[0] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1337                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1338                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1339           good_l4_csum[1] =
1340             flags[1] & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1341                         VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1342                         VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1343
1344           u32 udp_offset[2] = { };
1345           u8 is_tcp_udp[2];
1346           is_tcp_udp[0] =
1347             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1348           is_tcp_udp[1] =
1349             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1350           i16 len_diff[2] = { 0 };
1351           if (PREDICT_TRUE (is_tcp_udp[0]))
1352             {
1353               udp_header_t *udp =
1354                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1355               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1356                 && udp->checksum == 0;
1357               /* optimistically verify UDP length. */
1358               u16 ip_len, udp_len;
1359               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1360               udp_len = clib_net_to_host_u16 (udp->length);
1361               len_diff[0] = ip_len - udp_len;
1362             }
1363           if (PREDICT_TRUE (is_tcp_udp[1]))
1364             {
1365               udp_header_t *udp =
1366                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1367               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1368                 && udp->checksum == 0;
1369               /* optimistically verify UDP length. */
1370               u16 ip_len, udp_len;
1371               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1372               udp_len = clib_net_to_host_u16 (udp->length);
1373               len_diff[1] = ip_len - udp_len;
1374             }
1375
1376           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1377           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1378
1379           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1380           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1381
1382           u8 need_csum[2];
1383           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1384             && !good_l4_csum[0]
1385             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1386           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1387             && !good_l4_csum[1]
1388             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1389           if (PREDICT_FALSE (need_csum[0]))
1390             {
1391               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1392               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1393               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1394             }
1395           else
1396             {
1397               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1398                 error[0] = IP6_ERROR_BAD_LENGTH;
1399             }
1400           if (PREDICT_FALSE (need_csum[1]))
1401             {
1402               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1403               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1404               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1405             }
1406           else
1407             {
1408               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1409                 error[1] = IP6_ERROR_BAD_LENGTH;
1410             }
1411
1412
1413           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1414
1415           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1416
1417           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1418                          IP6_ERROR_UDP_CHECKSUM,
1419                          "Wrong IP6 errors constants");
1420           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1421                          IP6_ERROR_ICMP_CHECKSUM,
1422                          "Wrong IP6 errors constants");
1423
1424           error[0] =
1425             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1426           error[1] =
1427             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1428
1429           /* Drop packets from unroutable hosts. */
1430           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1431           u8 unroutable[2];
1432           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1433             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1434             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1435           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1436             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1437             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1438           if (PREDICT_FALSE (unroutable[0]))
1439             {
1440               error[0] =
1441                 !ip6_urpf_loose_check (im, b[0],
1442                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1443                 : error[0];
1444             }
1445           if (PREDICT_FALSE (unroutable[1]))
1446             {
1447               error[1] =
1448                 !ip6_urpf_loose_check (im, b[1],
1449                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1450                 : error[1];
1451             }
1452
1453           vnet_buffer (b[0])->ip.fib_index =
1454             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1455             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1456             vnet_buffer (b[0])->ip.fib_index;
1457           vnet_buffer (b[1])->ip.fib_index =
1458             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1459             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1460             vnet_buffer (b[1])->ip.fib_index;
1461         }                       /* head_of_feature_arc */
1462
1463       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1464       next[0] =
1465         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1466       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1467       next[1] =
1468         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1469
1470       b[0]->error = error_node->errors[0];
1471       b[1]->error = error_node->errors[1];
1472
1473       if (head_of_feature_arc)
1474         {
1475           u8 ip6_unknown[2];
1476           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1477           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1478           if (PREDICT_TRUE (ip6_unknown[0]))
1479             {
1480               u32 next32 = next[0];
1481               vnet_feature_arc_start (arc_index,
1482                                       vnet_buffer (b[0])->sw_if_index
1483                                       [VLIB_RX], &next32, b[0]);
1484               next[0] = next32;
1485             }
1486           if (PREDICT_TRUE (ip6_unknown[1]))
1487             {
1488               u32 next32 = next[1];
1489               vnet_feature_arc_start (arc_index,
1490                                       vnet_buffer (b[1])->sw_if_index
1491                                       [VLIB_RX], &next32, b[1]);
1492               next[1] = next32;
1493             }
1494         }
1495
1496       /* next */
1497       b += 2;
1498       next += 2;
1499       n_left_from -= 2;
1500     }
1501
1502   while (n_left_from)
1503     {
1504       u8 error;
1505       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1506
1507       ip6_header_t *ip;
1508       ip = vlib_buffer_get_current (b[0]);
1509
1510       if (head_of_feature_arc)
1511         {
1512           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1513           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1514
1515           u32 flags = b[0]->flags;
1516           u32 good_l4_csum =
1517             flags & (VNET_BUFFER_F_L4_CHECKSUM_CORRECT |
1518                      VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
1519                      VNET_BUFFER_F_OFFLOAD_UDP_CKSUM);
1520
1521           u32 udp_offset;
1522           i16 len_diff = 0;
1523           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1524           if (PREDICT_TRUE (is_tcp_udp))
1525             {
1526               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1527               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1528               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1529                 && udp->checksum == 0;
1530               /* optimistically verify UDP length. */
1531               u16 ip_len, udp_len;
1532               ip_len = clib_net_to_host_u16 (ip->payload_length);
1533               udp_len = clib_net_to_host_u16 (udp->length);
1534               len_diff = ip_len - udp_len;
1535             }
1536
1537           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1538           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1539
1540           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum
1541             && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1542           if (PREDICT_FALSE (need_csum))
1543             {
1544               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1545               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1546               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1547             }
1548           else
1549             {
1550               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1551                 error = IP6_ERROR_BAD_LENGTH;
1552             }
1553
1554
1555
1556           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1557
1558           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1559                          IP6_ERROR_UDP_CHECKSUM,
1560                          "Wrong IP6 errors constants");
1561           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1562                          IP6_ERROR_ICMP_CHECKSUM,
1563                          "Wrong IP6 errors constants");
1564
1565           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1566
1567           /* Drop packets from unroutable hosts. */
1568           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1569           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1570             && type != IP_BUILTIN_PROTOCOL_ICMP
1571             && !ip6_address_is_link_local_unicast (&ip->src_address);
1572           if (PREDICT_FALSE (unroutable))
1573             {
1574               error =
1575                 !ip6_urpf_loose_check (im, b[0],
1576                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1577                 error;
1578             }
1579
1580           vnet_buffer (b[0])->ip.fib_index =
1581             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1582             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1583             vnet_buffer (b[0])->ip.fib_index;
1584         }                       /* head_of_feature_arc */
1585
1586       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1587       next[0] =
1588         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1589
1590       b[0]->error = error_node->errors[0];
1591
1592       if (head_of_feature_arc)
1593         {
1594           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1595             {
1596               u32 next32 = next[0];
1597               vnet_feature_arc_start (arc_index,
1598                                       vnet_buffer (b[0])->sw_if_index
1599                                       [VLIB_RX], &next32, b[0]);
1600               next[0] = next32;
1601             }
1602         }
1603
1604       /* next */
1605       b += 1;
1606       next += 1;
1607       n_left_from -= 1;
1608     }
1609
1610   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1611   return frame->n_vectors;
1612 }
1613
1614 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1615                                vlib_frame_t * frame)
1616 {
1617   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1618 }
1619
1620 /* *INDENT-OFF* */
1621 VLIB_REGISTER_NODE (ip6_local_node) =
1622 {
1623   .name = "ip6-local",
1624   .vector_size = sizeof (u32),
1625   .format_trace = format_ip6_forward_next_trace,
1626   .n_next_nodes = IP_LOCAL_N_NEXT,
1627   .next_nodes =
1628   {
1629     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1630     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1631     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1632     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1633     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1634   },
1635 };
1636 /* *INDENT-ON* */
1637
1638 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1639                                           vlib_node_runtime_t * node,
1640                                           vlib_frame_t * frame)
1641 {
1642   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1643 }
1644
1645 /* *INDENT-OFF* */
1646 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1647   .name = "ip6-local-end-of-arc",
1648   .vector_size = sizeof (u32),
1649
1650   .format_trace = format_ip6_forward_next_trace,
1651   .sibling_of = "ip6-local",
1652 };
1653
1654 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1655   .arc_name = "ip6-local",
1656   .node_name = "ip6-local-end-of-arc",
1657   .runs_before = 0, /* not before any other features */
1658 };
1659 /* *INDENT-ON* */
1660
1661 #ifdef CLIB_MARCH_VARIANT
1662 extern vlib_node_registration_t ip6_local_node;
1663 #else
1664 void
1665 ip6_register_protocol (u32 protocol, u32 node_index)
1666 {
1667   vlib_main_t *vm = vlib_get_main ();
1668   ip6_main_t *im = &ip6_main;
1669   ip_lookup_main_t *lm = &im->lookup_main;
1670
1671   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1672   lm->local_next_by_ip_protocol[protocol] =
1673     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1674 }
1675
1676 void
1677 ip6_unregister_protocol (u32 protocol)
1678 {
1679   ip6_main_t *im = &ip6_main;
1680   ip_lookup_main_t *lm = &im->lookup_main;
1681
1682   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1683   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1684 }
1685 #endif
1686
1687 typedef enum
1688 {
1689   IP6_REWRITE_NEXT_DROP,
1690   IP6_REWRITE_NEXT_ICMP_ERROR,
1691   IP6_REWRITE_NEXT_FRAGMENT,
1692   IP6_REWRITE_N_NEXT            /* Last */
1693 } ip6_rewrite_next_t;
1694
1695 /**
1696  * This bits of an IPv6 address to mask to construct a multicast
1697  * MAC address
1698  */
1699 #define IP6_MCAST_ADDR_MASK 0xffffffff
1700
1701 always_inline void
1702 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1703                u16 adj_packet_bytes, bool is_locally_generated,
1704                u32 * next, u8 is_midchain, u32 * error)
1705 {
1706   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1707     {
1708       if (is_locally_generated)
1709         {
1710           /* IP fragmentation */
1711           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1712                                    (is_midchain ?
1713                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1714                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1715           *next = IP6_REWRITE_NEXT_FRAGMENT;
1716           *error = IP6_ERROR_MTU_EXCEEDED;
1717         }
1718       else
1719         {
1720           *error = IP6_ERROR_MTU_EXCEEDED;
1721           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1722                                        adj_packet_bytes);
1723           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1724         }
1725     }
1726 }
1727
1728 always_inline uword
1729 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1730                              vlib_node_runtime_t * node,
1731                              vlib_frame_t * frame,
1732                              int do_counters, int is_midchain, int is_mcast)
1733 {
1734   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1735   u32 *from = vlib_frame_vector_args (frame);
1736   u32 n_left_from, n_left_to_next, *to_next, next_index;
1737   vlib_node_runtime_t *error_node =
1738     vlib_node_get_runtime (vm, ip6_input_node.index);
1739
1740   n_left_from = frame->n_vectors;
1741   next_index = node->cached_next_index;
1742   u32 thread_index = vm->thread_index;
1743
1744   while (n_left_from > 0)
1745     {
1746       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1747
1748       while (n_left_from >= 4 && n_left_to_next >= 2)
1749         {
1750           const ip_adjacency_t *adj0, *adj1;
1751           vlib_buffer_t *p0, *p1;
1752           ip6_header_t *ip0, *ip1;
1753           u32 pi0, rw_len0, next0, error0, adj_index0;
1754           u32 pi1, rw_len1, next1, error1, adj_index1;
1755           u32 tx_sw_if_index0, tx_sw_if_index1;
1756           bool is_locally_originated0, is_locally_originated1;
1757
1758           /* Prefetch next iteration. */
1759           {
1760             vlib_buffer_t *p2, *p3;
1761
1762             p2 = vlib_get_buffer (vm, from[2]);
1763             p3 = vlib_get_buffer (vm, from[3]);
1764
1765             vlib_prefetch_buffer_header (p2, LOAD);
1766             vlib_prefetch_buffer_header (p3, LOAD);
1767
1768             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1769             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1770
1771             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1772             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1773           }
1774
1775           pi0 = to_next[0] = from[0];
1776           pi1 = to_next[1] = from[1];
1777
1778           from += 2;
1779           n_left_from -= 2;
1780           to_next += 2;
1781           n_left_to_next -= 2;
1782
1783           p0 = vlib_get_buffer (vm, pi0);
1784           p1 = vlib_get_buffer (vm, pi1);
1785
1786           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1787           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1788
1789           ip0 = vlib_buffer_get_current (p0);
1790           ip1 = vlib_buffer_get_current (p1);
1791
1792           error0 = error1 = IP6_ERROR_NONE;
1793           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1794
1795           is_locally_originated0 =
1796             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1797           if (PREDICT_TRUE (!is_locally_originated0))
1798             {
1799               i32 hop_limit0 = ip0->hop_limit;
1800
1801               /* Input node should have reject packets with hop limit 0. */
1802               ASSERT (ip0->hop_limit > 0);
1803
1804               hop_limit0 -= 1;
1805
1806               ip0->hop_limit = hop_limit0;
1807
1808               /*
1809                * If the hop count drops below 1 when forwarding, generate
1810                * an ICMP response.
1811                */
1812               if (PREDICT_FALSE (hop_limit0 <= 0))
1813                 {
1814                   error0 = IP6_ERROR_TIME_EXPIRED;
1815                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1816                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1817                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1818                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1819                                                0);
1820                 }
1821             }
1822
1823           is_locally_originated1 =
1824             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1825           if (PREDICT_TRUE (!is_locally_originated1))
1826             {
1827               i32 hop_limit1 = ip1->hop_limit;
1828
1829               /* Input node should have reject packets with hop limit 0. */
1830               ASSERT (ip1->hop_limit > 0);
1831
1832               hop_limit1 -= 1;
1833
1834               ip1->hop_limit = hop_limit1;
1835
1836               /*
1837                * If the hop count drops below 1 when forwarding, generate
1838                * an ICMP response.
1839                */
1840               if (PREDICT_FALSE (hop_limit1 <= 0))
1841                 {
1842                   error1 = IP6_ERROR_TIME_EXPIRED;
1843                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1844                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1845                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1846                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1847                                                0);
1848                 }
1849             }
1850
1851           adj0 = adj_get (adj_index0);
1852           adj1 = adj_get (adj_index1);
1853
1854           rw_len0 = adj0[0].rewrite_header.data_bytes;
1855           rw_len1 = adj1[0].rewrite_header.data_bytes;
1856           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1857           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1858
1859           if (do_counters)
1860             {
1861               vlib_increment_combined_counter
1862                 (&adjacency_counters,
1863                  thread_index, adj_index0, 1,
1864                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1865               vlib_increment_combined_counter
1866                 (&adjacency_counters,
1867                  thread_index, adj_index1, 1,
1868                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1869             }
1870
1871           /* Check MTU of outgoing interface. */
1872           u16 ip0_len =
1873             clib_net_to_host_u16 (ip0->payload_length) +
1874             sizeof (ip6_header_t);
1875           u16 ip1_len =
1876             clib_net_to_host_u16 (ip1->payload_length) +
1877             sizeof (ip6_header_t);
1878           if (p0->flags & VNET_BUFFER_F_GSO)
1879             ip0_len = gso_mtu_sz (p0);
1880           if (p1->flags & VNET_BUFFER_F_GSO)
1881             ip1_len = gso_mtu_sz (p1);
1882
1883
1884
1885           ip6_mtu_check (p0, ip0_len,
1886                          adj0[0].rewrite_header.max_l3_packet_bytes,
1887                          is_locally_originated0, &next0, is_midchain,
1888                          &error0);
1889           ip6_mtu_check (p1, ip1_len,
1890                          adj1[0].rewrite_header.max_l3_packet_bytes,
1891                          is_locally_originated1, &next1, is_midchain,
1892                          &error1);
1893
1894           /* Don't adjust the buffer for hop count issue; icmp-error node
1895            * wants to see the IP header */
1896           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1897             {
1898               p0->current_data -= rw_len0;
1899               p0->current_length += rw_len0;
1900
1901               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1902               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1903               next0 = adj0[0].rewrite_header.next_index;
1904
1905               if (PREDICT_FALSE
1906                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1907                 vnet_feature_arc_start_w_cfg_index
1908                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
1909                    adj0->ia_cfg_index);
1910             }
1911           else
1912             {
1913               p0->error = error_node->errors[error0];
1914             }
1915           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1916             {
1917               p1->current_data -= rw_len1;
1918               p1->current_length += rw_len1;
1919
1920               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1921               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1922               next1 = adj1[0].rewrite_header.next_index;
1923
1924               if (PREDICT_FALSE
1925                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1926                 vnet_feature_arc_start_w_cfg_index
1927                   (lm->output_feature_arc_index, tx_sw_if_index1, &next1, p1,
1928                    adj1->ia_cfg_index);
1929             }
1930           else
1931             {
1932               p1->error = error_node->errors[error1];
1933             }
1934
1935           if (is_midchain)
1936             {
1937               /* before we paint on the next header, update the L4
1938                * checksums if required, since there's no offload on a tunnel */
1939               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
1940                                           1 /* is_ip6 */ );
1941               vnet_calc_checksums_inline (vm, p1, 0 /* is_ip4 */ ,
1942                                           1 /* is_ip6 */ );
1943
1944               /* Guess we are only writing on ipv6 header. */
1945               vnet_rewrite_two_headers (adj0[0], adj1[0],
1946                                         ip0, ip1, sizeof (ip6_header_t));
1947             }
1948           else
1949             /* Guess we are only writing on simple Ethernet header. */
1950             vnet_rewrite_two_headers (adj0[0], adj1[0],
1951                                       ip0, ip1, sizeof (ethernet_header_t));
1952
1953           if (is_midchain)
1954             {
1955               if (adj0->sub_type.midchain.fixup_func)
1956                 adj0->sub_type.midchain.fixup_func
1957                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
1958               if (adj1->sub_type.midchain.fixup_func)
1959                 adj1->sub_type.midchain.fixup_func
1960                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
1961             }
1962           if (is_mcast)
1963             {
1964               /*
1965                * copy bytes from the IP address into the MAC rewrite
1966                */
1967               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1968                                           adj0->
1969                                           rewrite_header.dst_mcast_offset,
1970                                           &ip0->dst_address.as_u32[3],
1971                                           (u8 *) ip0);
1972               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
1973                                           adj1->
1974                                           rewrite_header.dst_mcast_offset,
1975                                           &ip1->dst_address.as_u32[3],
1976                                           (u8 *) ip1);
1977             }
1978
1979           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1980                                            to_next, n_left_to_next,
1981                                            pi0, pi1, next0, next1);
1982         }
1983
1984       while (n_left_from > 0 && n_left_to_next > 0)
1985         {
1986           ip_adjacency_t *adj0;
1987           vlib_buffer_t *p0;
1988           ip6_header_t *ip0;
1989           u32 pi0, rw_len0;
1990           u32 adj_index0, next0, error0;
1991           u32 tx_sw_if_index0;
1992           bool is_locally_originated0;
1993
1994           pi0 = to_next[0] = from[0];
1995
1996           p0 = vlib_get_buffer (vm, pi0);
1997
1998           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1999
2000           adj0 = adj_get (adj_index0);
2001
2002           ip0 = vlib_buffer_get_current (p0);
2003
2004           error0 = IP6_ERROR_NONE;
2005           next0 = IP6_REWRITE_NEXT_DROP;
2006
2007           /* Check hop limit */
2008           is_locally_originated0 =
2009             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
2010           if (PREDICT_TRUE (!is_locally_originated0))
2011             {
2012               i32 hop_limit0 = ip0->hop_limit;
2013
2014               ASSERT (ip0->hop_limit > 0);
2015
2016               hop_limit0 -= 1;
2017
2018               ip0->hop_limit = hop_limit0;
2019
2020               if (PREDICT_FALSE (hop_limit0 <= 0))
2021                 {
2022                   /*
2023                    * If the hop count drops below 1 when forwarding, generate
2024                    * an ICMP response.
2025                    */
2026                   error0 = IP6_ERROR_TIME_EXPIRED;
2027                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
2028                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2029                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
2030                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
2031                                                0);
2032                 }
2033             }
2034
2035           if (is_midchain)
2036             {
2037               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
2038                                           1 /* is_ip6 */ );
2039
2040               /* Guess we are only writing on ip6 header. */
2041               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip6_header_t));
2042             }
2043           else
2044             /* Guess we are only writing on simple Ethernet header. */
2045             vnet_rewrite_one_header (adj0[0], ip0,
2046                                      sizeof (ethernet_header_t));
2047
2048           /* Update packet buffer attributes/set output interface. */
2049           rw_len0 = adj0[0].rewrite_header.data_bytes;
2050           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2051
2052           if (do_counters)
2053             {
2054               vlib_increment_combined_counter
2055                 (&adjacency_counters,
2056                  thread_index, adj_index0, 1,
2057                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2058             }
2059
2060           /* Check MTU of outgoing interface. */
2061           u16 ip0_len =
2062             clib_net_to_host_u16 (ip0->payload_length) +
2063             sizeof (ip6_header_t);
2064           if (p0->flags & VNET_BUFFER_F_GSO)
2065             ip0_len = gso_mtu_sz (p0);
2066
2067           ip6_mtu_check (p0, ip0_len,
2068                          adj0[0].rewrite_header.max_l3_packet_bytes,
2069                          is_locally_originated0, &next0, is_midchain,
2070                          &error0);
2071
2072           /* Don't adjust the buffer for hop count issue; icmp-error node
2073            * wants to see the IP header */
2074           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2075             {
2076               p0->current_data -= rw_len0;
2077               p0->current_length += rw_len0;
2078
2079               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2080
2081               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2082               next0 = adj0[0].rewrite_header.next_index;
2083
2084               if (PREDICT_FALSE
2085                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2086                 vnet_feature_arc_start_w_cfg_index
2087                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
2088                    adj0->ia_cfg_index);
2089             }
2090           else
2091             {
2092               p0->error = error_node->errors[error0];
2093             }
2094
2095           if (is_midchain)
2096             {
2097               if (adj0->sub_type.midchain.fixup_func)
2098                 adj0->sub_type.midchain.fixup_func
2099                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2100             }
2101           if (is_mcast)
2102             {
2103               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2104                                           adj0->
2105                                           rewrite_header.dst_mcast_offset,
2106                                           &ip0->dst_address.as_u32[3],
2107                                           (u8 *) ip0);
2108             }
2109
2110           from += 1;
2111           n_left_from -= 1;
2112           to_next += 1;
2113           n_left_to_next -= 1;
2114
2115           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2116                                            to_next, n_left_to_next,
2117                                            pi0, next0);
2118         }
2119
2120       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2121     }
2122
2123   /* Need to do trace after rewrites to pick up new packet data. */
2124   if (node->flags & VLIB_NODE_FLAG_TRACE)
2125     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2126
2127   return frame->n_vectors;
2128 }
2129
2130 always_inline uword
2131 ip6_rewrite_inline (vlib_main_t * vm,
2132                     vlib_node_runtime_t * node,
2133                     vlib_frame_t * frame,
2134                     int do_counters, int is_midchain, int is_mcast)
2135 {
2136   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2137                                       is_midchain, is_mcast);
2138 }
2139
2140 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2141                                  vlib_node_runtime_t * node,
2142                                  vlib_frame_t * frame)
2143 {
2144   if (adj_are_counters_enabled ())
2145     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2146   else
2147     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2148 }
2149
2150 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2151                                        vlib_node_runtime_t * node,
2152                                        vlib_frame_t * frame)
2153 {
2154   if (adj_are_counters_enabled ())
2155     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2156   else
2157     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2158 }
2159
2160 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2161                                        vlib_node_runtime_t * node,
2162                                        vlib_frame_t * frame)
2163 {
2164   if (adj_are_counters_enabled ())
2165     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2166   else
2167     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2168 }
2169
2170 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2171                                   vlib_node_runtime_t * node,
2172                                   vlib_frame_t * frame)
2173 {
2174   if (adj_are_counters_enabled ())
2175     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2176   else
2177     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2178 }
2179
2180 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2181                                         vlib_node_runtime_t * node,
2182                                         vlib_frame_t * frame)
2183 {
2184   if (adj_are_counters_enabled ())
2185     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2186   else
2187     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2188 }
2189
2190 /* *INDENT-OFF* */
2191 VLIB_REGISTER_NODE (ip6_midchain_node) =
2192 {
2193   .name = "ip6-midchain",
2194   .vector_size = sizeof (u32),
2195   .format_trace = format_ip6_forward_next_trace,
2196   .sibling_of = "ip6-rewrite",
2197   };
2198
2199 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2200 {
2201   .name = "ip6-rewrite",
2202   .vector_size = sizeof (u32),
2203   .format_trace = format_ip6_rewrite_trace,
2204   .n_next_nodes = IP6_REWRITE_N_NEXT,
2205   .next_nodes =
2206   {
2207     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2208     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2209     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2210   },
2211 };
2212
2213 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2214   .name = "ip6-rewrite-bcast",
2215   .vector_size = sizeof (u32),
2216
2217   .format_trace = format_ip6_rewrite_trace,
2218   .sibling_of = "ip6-rewrite",
2219 };
2220
2221 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2222 {
2223   .name = "ip6-rewrite-mcast",
2224   .vector_size = sizeof (u32),
2225   .format_trace = format_ip6_rewrite_trace,
2226   .sibling_of = "ip6-rewrite",
2227 };
2228
2229
2230 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2231 {
2232   .name = "ip6-mcast-midchain",
2233   .vector_size = sizeof (u32),
2234   .format_trace = format_ip6_rewrite_trace,
2235   .sibling_of = "ip6-rewrite",
2236 };
2237
2238 /* *INDENT-ON* */
2239
2240 /*
2241  * Hop-by-Hop handling
2242  */
2243 #ifndef CLIB_MARCH_VARIANT
2244 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2245 #endif /* CLIB_MARCH_VARIANT */
2246
2247 #define foreach_ip6_hop_by_hop_error \
2248 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2249 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2250 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2251
2252 /* *INDENT-OFF* */
2253 typedef enum
2254 {
2255 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2256   foreach_ip6_hop_by_hop_error
2257 #undef _
2258   IP6_HOP_BY_HOP_N_ERROR,
2259 } ip6_hop_by_hop_error_t;
2260 /* *INDENT-ON* */
2261
2262 /*
2263  * Primary h-b-h handler trace support
2264  * We work pretty hard on the problem for obvious reasons
2265  */
2266 typedef struct
2267 {
2268   u32 next_index;
2269   u32 trace_len;
2270   u8 option_data[256];
2271 } ip6_hop_by_hop_trace_t;
2272
2273 extern vlib_node_registration_t ip6_hop_by_hop_node;
2274
2275 static char *ip6_hop_by_hop_error_strings[] = {
2276 #define _(sym,string) string,
2277   foreach_ip6_hop_by_hop_error
2278 #undef _
2279 };
2280
2281 #ifndef CLIB_MARCH_VARIANT
2282 u8 *
2283 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2284 {
2285   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2286   int total_len = va_arg (*args, int);
2287   ip6_hop_by_hop_option_t *opt0, *limit0;
2288   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2289   u8 type0;
2290
2291   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2292               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2293
2294   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2295   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2296
2297   while (opt0 < limit0)
2298     {
2299       type0 = opt0->type;
2300       switch (type0)
2301         {
2302         case 0:         /* Pad, just stop */
2303           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2304           break;
2305
2306         default:
2307           if (hm->trace[type0])
2308             {
2309               s = (*hm->trace[type0]) (s, opt0);
2310             }
2311           else
2312             {
2313               s =
2314                 format (s, "\n    unrecognized option %d length %d", type0,
2315                         opt0->length);
2316             }
2317           opt0 =
2318             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2319                                          sizeof (ip6_hop_by_hop_option_t));
2320           break;
2321         }
2322     }
2323   return s;
2324 }
2325 #endif
2326
2327 static u8 *
2328 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2329 {
2330   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2331   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2332   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2333   ip6_hop_by_hop_header_t *hbh0;
2334   ip6_hop_by_hop_option_t *opt0, *limit0;
2335   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2336
2337   u8 type0;
2338
2339   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2340
2341   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2342               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2343
2344   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2345   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2346
2347   while (opt0 < limit0)
2348     {
2349       type0 = opt0->type;
2350       switch (type0)
2351         {
2352         case 0:         /* Pad, just stop */
2353           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2354           break;
2355
2356         default:
2357           if (hm->trace[type0])
2358             {
2359               s = (*hm->trace[type0]) (s, opt0);
2360             }
2361           else
2362             {
2363               s =
2364                 format (s, "\n    unrecognized option %d length %d", type0,
2365                         opt0->length);
2366             }
2367           opt0 =
2368             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2369                                          sizeof (ip6_hop_by_hop_option_t));
2370           break;
2371         }
2372     }
2373   return s;
2374 }
2375
2376 always_inline u8
2377 ip6_scan_hbh_options (vlib_buffer_t * b0,
2378                       ip6_header_t * ip0,
2379                       ip6_hop_by_hop_header_t * hbh0,
2380                       ip6_hop_by_hop_option_t * opt0,
2381                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2382 {
2383   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2384   u8 type0;
2385   u8 error0 = 0;
2386
2387   while (opt0 < limit0)
2388     {
2389       type0 = opt0->type;
2390       switch (type0)
2391         {
2392         case 0:         /* Pad1 */
2393           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2394           continue;
2395         case 1:         /* PadN */
2396           break;
2397         default:
2398           if (hm->options[type0])
2399             {
2400               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2401                 {
2402                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2403                   return (error0);
2404                 }
2405             }
2406           else
2407             {
2408               /* Unrecognized mandatory option, check the two high order bits */
2409               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2410                 {
2411                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2412                   break;
2413                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2414                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2415                   *next0 = IP_LOOKUP_NEXT_DROP;
2416                   break;
2417                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2418                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2419                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2420                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2421                                                ICMP6_parameter_problem_unrecognized_option,
2422                                                (u8 *) opt0 - (u8 *) ip0);
2423                   break;
2424                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2425                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2426                   if (!ip6_address_is_multicast (&ip0->dst_address))
2427                     {
2428                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2429                       icmp6_error_set_vnet_buffer (b0,
2430                                                    ICMP6_parameter_problem,
2431                                                    ICMP6_parameter_problem_unrecognized_option,
2432                                                    (u8 *) opt0 - (u8 *) ip0);
2433                     }
2434                   else
2435                     {
2436                       *next0 = IP_LOOKUP_NEXT_DROP;
2437                     }
2438                   break;
2439                 }
2440               return (error0);
2441             }
2442         }
2443       opt0 =
2444         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2445                                      sizeof (ip6_hop_by_hop_option_t));
2446     }
2447   return (error0);
2448 }
2449
2450 /*
2451  * Process the Hop-by-Hop Options header
2452  */
2453 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2454                                     vlib_node_runtime_t * node,
2455                                     vlib_frame_t * frame)
2456 {
2457   vlib_node_runtime_t *error_node =
2458     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2459   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2460   u32 n_left_from, *from, *to_next;
2461   ip_lookup_next_t next_index;
2462
2463   from = vlib_frame_vector_args (frame);
2464   n_left_from = frame->n_vectors;
2465   next_index = node->cached_next_index;
2466
2467   while (n_left_from > 0)
2468     {
2469       u32 n_left_to_next;
2470
2471       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2472
2473       while (n_left_from >= 4 && n_left_to_next >= 2)
2474         {
2475           u32 bi0, bi1;
2476           vlib_buffer_t *b0, *b1;
2477           u32 next0, next1;
2478           ip6_header_t *ip0, *ip1;
2479           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2480           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2481           u8 error0 = 0, error1 = 0;
2482
2483           /* Prefetch next iteration. */
2484           {
2485             vlib_buffer_t *p2, *p3;
2486
2487             p2 = vlib_get_buffer (vm, from[2]);
2488             p3 = vlib_get_buffer (vm, from[3]);
2489
2490             vlib_prefetch_buffer_header (p2, LOAD);
2491             vlib_prefetch_buffer_header (p3, LOAD);
2492
2493             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2494             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2495           }
2496
2497           /* Speculatively enqueue b0, b1 to the current next frame */
2498           to_next[0] = bi0 = from[0];
2499           to_next[1] = bi1 = from[1];
2500           from += 2;
2501           to_next += 2;
2502           n_left_from -= 2;
2503           n_left_to_next -= 2;
2504
2505           b0 = vlib_get_buffer (vm, bi0);
2506           b1 = vlib_get_buffer (vm, bi1);
2507
2508           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2509           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2510           ip_adjacency_t *adj0 = adj_get (adj_index0);
2511           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2512           ip_adjacency_t *adj1 = adj_get (adj_index1);
2513
2514           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2515           next0 = adj0->lookup_next_index;
2516           next1 = adj1->lookup_next_index;
2517
2518           ip0 = vlib_buffer_get_current (b0);
2519           ip1 = vlib_buffer_get_current (b1);
2520           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2521           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2522           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2523           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2524           limit0 =
2525             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2526                                          ((hbh0->length + 1) << 3));
2527           limit1 =
2528             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2529                                          ((hbh1->length + 1) << 3));
2530
2531           /*
2532            * Basic validity checks
2533            */
2534           if ((hbh0->length + 1) << 3 >
2535               clib_net_to_host_u16 (ip0->payload_length))
2536             {
2537               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2538               next0 = IP_LOOKUP_NEXT_DROP;
2539               goto outdual;
2540             }
2541           /* Scan the set of h-b-h options, process ones that we understand */
2542           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2543
2544           if ((hbh1->length + 1) << 3 >
2545               clib_net_to_host_u16 (ip1->payload_length))
2546             {
2547               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2548               next1 = IP_LOOKUP_NEXT_DROP;
2549               goto outdual;
2550             }
2551           /* Scan the set of h-b-h options, process ones that we understand */
2552           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2553
2554         outdual:
2555           /* Has the classifier flagged this buffer for special treatment? */
2556           if (PREDICT_FALSE
2557               ((error0 == 0)
2558                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2559             next0 = hm->next_override;
2560
2561           /* Has the classifier flagged this buffer for special treatment? */
2562           if (PREDICT_FALSE
2563               ((error1 == 0)
2564                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2565             next1 = hm->next_override;
2566
2567           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2568             {
2569               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2570                 {
2571                   ip6_hop_by_hop_trace_t *t =
2572                     vlib_add_trace (vm, node, b0, sizeof (*t));
2573                   u32 trace_len = (hbh0->length + 1) << 3;
2574                   t->next_index = next0;
2575                   /* Capture the h-b-h option verbatim */
2576                   trace_len =
2577                     trace_len <
2578                     ARRAY_LEN (t->option_data) ? trace_len :
2579                     ARRAY_LEN (t->option_data);
2580                   t->trace_len = trace_len;
2581                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2582                 }
2583               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2584                 {
2585                   ip6_hop_by_hop_trace_t *t =
2586                     vlib_add_trace (vm, node, b1, sizeof (*t));
2587                   u32 trace_len = (hbh1->length + 1) << 3;
2588                   t->next_index = next1;
2589                   /* Capture the h-b-h option verbatim */
2590                   trace_len =
2591                     trace_len <
2592                     ARRAY_LEN (t->option_data) ? trace_len :
2593                     ARRAY_LEN (t->option_data);
2594                   t->trace_len = trace_len;
2595                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2596                 }
2597
2598             }
2599
2600           b0->error = error_node->errors[error0];
2601           b1->error = error_node->errors[error1];
2602
2603           /* verify speculative enqueue, maybe switch current next frame */
2604           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2605                                            n_left_to_next, bi0, bi1, next0,
2606                                            next1);
2607         }
2608
2609       while (n_left_from > 0 && n_left_to_next > 0)
2610         {
2611           u32 bi0;
2612           vlib_buffer_t *b0;
2613           u32 next0;
2614           ip6_header_t *ip0;
2615           ip6_hop_by_hop_header_t *hbh0;
2616           ip6_hop_by_hop_option_t *opt0, *limit0;
2617           u8 error0 = 0;
2618
2619           /* Speculatively enqueue b0 to the current next frame */
2620           bi0 = from[0];
2621           to_next[0] = bi0;
2622           from += 1;
2623           to_next += 1;
2624           n_left_from -= 1;
2625           n_left_to_next -= 1;
2626
2627           b0 = vlib_get_buffer (vm, bi0);
2628           /*
2629            * Default use the next_index from the adjacency.
2630            * A HBH option rarely redirects to a different node
2631            */
2632           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2633           ip_adjacency_t *adj0 = adj_get (adj_index0);
2634           next0 = adj0->lookup_next_index;
2635
2636           ip0 = vlib_buffer_get_current (b0);
2637           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2638           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2639           limit0 =
2640             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2641                                          ((hbh0->length + 1) << 3));
2642
2643           /*
2644            * Basic validity checks
2645            */
2646           if ((hbh0->length + 1) << 3 >
2647               clib_net_to_host_u16 (ip0->payload_length))
2648             {
2649               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2650               next0 = IP_LOOKUP_NEXT_DROP;
2651               goto out0;
2652             }
2653
2654           /* Scan the set of h-b-h options, process ones that we understand */
2655           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2656
2657         out0:
2658           /* Has the classifier flagged this buffer for special treatment? */
2659           if (PREDICT_FALSE
2660               ((error0 == 0)
2661                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2662             next0 = hm->next_override;
2663
2664           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2665             {
2666               ip6_hop_by_hop_trace_t *t =
2667                 vlib_add_trace (vm, node, b0, sizeof (*t));
2668               u32 trace_len = (hbh0->length + 1) << 3;
2669               t->next_index = next0;
2670               /* Capture the h-b-h option verbatim */
2671               trace_len =
2672                 trace_len <
2673                 ARRAY_LEN (t->option_data) ? trace_len :
2674                 ARRAY_LEN (t->option_data);
2675               t->trace_len = trace_len;
2676               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2677             }
2678
2679           b0->error = error_node->errors[error0];
2680
2681           /* verify speculative enqueue, maybe switch current next frame */
2682           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2683                                            n_left_to_next, bi0, next0);
2684         }
2685       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2686     }
2687   return frame->n_vectors;
2688 }
2689
2690 /* *INDENT-OFF* */
2691 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2692 {
2693   .name = "ip6-hop-by-hop",
2694   .sibling_of = "ip6-lookup",
2695   .vector_size = sizeof (u32),
2696   .format_trace = format_ip6_hop_by_hop_trace,
2697   .type = VLIB_NODE_TYPE_INTERNAL,
2698   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2699   .error_strings = ip6_hop_by_hop_error_strings,
2700   .n_next_nodes = 0,
2701 };
2702 /* *INDENT-ON* */
2703
2704 static clib_error_t *
2705 ip6_hop_by_hop_init (vlib_main_t * vm)
2706 {
2707   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2708   clib_memset (hm->options, 0, sizeof (hm->options));
2709   clib_memset (hm->trace, 0, sizeof (hm->trace));
2710   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2711   return (0);
2712 }
2713
2714 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2715
2716 #ifndef CLIB_MARCH_VARIANT
2717 void
2718 ip6_hbh_set_next_override (uword next)
2719 {
2720   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2721
2722   hm->next_override = next;
2723 }
2724
2725 int
2726 ip6_hbh_register_option (u8 option,
2727                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2728                                       ip6_hop_by_hop_option_t * opt),
2729                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2730 {
2731   ip6_main_t *im = &ip6_main;
2732   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2733
2734   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2735
2736   /* Already registered */
2737   if (hm->options[option])
2738     return (-1);
2739
2740   hm->options[option] = options;
2741   hm->trace[option] = trace;
2742
2743   /* Set global variable */
2744   im->hbh_enabled = 1;
2745
2746   return (0);
2747 }
2748
2749 int
2750 ip6_hbh_unregister_option (u8 option)
2751 {
2752   ip6_main_t *im = &ip6_main;
2753   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2754
2755   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2756
2757   /* Not registered */
2758   if (!hm->options[option])
2759     return (-1);
2760
2761   hm->options[option] = NULL;
2762   hm->trace[option] = NULL;
2763
2764   /* Disable global knob if this was the last option configured */
2765   int i;
2766   bool found = false;
2767   for (i = 0; i < 256; i++)
2768     {
2769       if (hm->options[option])
2770         {
2771           found = true;
2772           break;
2773         }
2774     }
2775   if (!found)
2776     im->hbh_enabled = 0;
2777
2778   return (0);
2779 }
2780
2781 /* Global IP6 main. */
2782 ip6_main_t ip6_main;
2783 #endif
2784
2785 static clib_error_t *
2786 ip6_lookup_init (vlib_main_t * vm)
2787 {
2788   ip6_main_t *im = &ip6_main;
2789   clib_error_t *error;
2790   uword i;
2791
2792   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2793     return error;
2794
2795   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2796     {
2797       u32 j, i0, i1;
2798
2799       i0 = i / 32;
2800       i1 = i % 32;
2801
2802       for (j = 0; j < i0; j++)
2803         im->fib_masks[i].as_u32[j] = ~0;
2804
2805       if (i1)
2806         im->fib_masks[i].as_u32[i0] =
2807           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2808     }
2809
2810   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2811
2812   /* Create FIB with index 0 and table id of 0. */
2813   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2814                                      FIB_SOURCE_DEFAULT_ROUTE);
2815   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2816                                       MFIB_SOURCE_DEFAULT_ROUTE);
2817
2818   {
2819     pg_node_t *pn;
2820     pn = pg_get_node (ip6_lookup_node.index);
2821     pn->unformat_edit = unformat_pg_ip6_header;
2822   }
2823
2824   /* Unless explicitly configured, don't process HBH options */
2825   im->hbh_enabled = 0;
2826
2827   return error;
2828 }
2829
2830 VLIB_INIT_FUNCTION (ip6_lookup_init);
2831
2832 #ifndef CLIB_MARCH_VARIANT
2833 int
2834 vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2835 {
2836   u32 fib_index;
2837
2838   fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
2839
2840   if (~0 == fib_index)
2841     return VNET_API_ERROR_NO_SUCH_FIB;
2842
2843   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6,
2844                                   flow_hash_config);
2845
2846   return 0;
2847 }
2848 #endif
2849
2850 static clib_error_t *
2851 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2852                               unformat_input_t * input,
2853                               vlib_cli_command_t * cmd)
2854 {
2855   int matched = 0;
2856   u32 table_id = 0;
2857   u32 flow_hash_config = 0;
2858   int rv;
2859
2860   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2861     {
2862       if (unformat (input, "table %d", &table_id))
2863         matched = 1;
2864 #define _(a,v) \
2865     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2866       foreach_flow_hash_bit
2867 #undef _
2868         else
2869         break;
2870     }
2871
2872   if (matched == 0)
2873     return clib_error_return (0, "unknown input `%U'",
2874                               format_unformat_error, input);
2875
2876   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2877   switch (rv)
2878     {
2879     case 0:
2880       break;
2881
2882     case -1:
2883       return clib_error_return (0, "no such FIB table %d", table_id);
2884
2885     default:
2886       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2887       break;
2888     }
2889
2890   return 0;
2891 }
2892
2893 /*?
2894  * Configure the set of IPv6 fields used by the flow hash.
2895  *
2896  * @cliexpar
2897  * @parblock
2898  * Example of how to set the flow hash on a given table:
2899  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2900  *
2901  * Example of display the configured flow hash:
2902  * @cliexstart{show ip6 fib}
2903  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2904  * @::/0
2905  *   unicast-ip6-chain
2906  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2907  *     [0] [@0]: dpo-drop ip6
2908  * fe80::/10
2909  *   unicast-ip6-chain
2910  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2911  *     [0] [@2]: dpo-receive
2912  * ff02::1/128
2913  *   unicast-ip6-chain
2914  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2915  *     [0] [@2]: dpo-receive
2916  * ff02::2/128
2917  *   unicast-ip6-chain
2918  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2919  *     [0] [@2]: dpo-receive
2920  * ff02::16/128
2921  *   unicast-ip6-chain
2922  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2923  *     [0] [@2]: dpo-receive
2924  * ff02::1:ff00:0/104
2925  *   unicast-ip6-chain
2926  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2927  *     [0] [@2]: dpo-receive
2928  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2929  * @::/0
2930  *   unicast-ip6-chain
2931  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2932  *     [0] [@0]: dpo-drop ip6
2933  * @::a:1:1:0:4/126
2934  *   unicast-ip6-chain
2935  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2936  *     [0] [@4]: ipv6-glean: af_packet0
2937  * @::a:1:1:0:7/128
2938  *   unicast-ip6-chain
2939  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2940  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2941  * fe80::/10
2942  *   unicast-ip6-chain
2943  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2944  *     [0] [@2]: dpo-receive
2945  * fe80::fe:3eff:fe3e:9222/128
2946  *   unicast-ip6-chain
2947  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2948  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2949  * ff02::1/128
2950  *   unicast-ip6-chain
2951  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2952  *     [0] [@2]: dpo-receive
2953  * ff02::2/128
2954  *   unicast-ip6-chain
2955  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2956  *     [0] [@2]: dpo-receive
2957  * ff02::16/128
2958  *   unicast-ip6-chain
2959  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2960  *     [0] [@2]: dpo-receive
2961  * ff02::1:ff00:0/104
2962  *   unicast-ip6-chain
2963  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2964  *     [0] [@2]: dpo-receive
2965  * @cliexend
2966  * @endparblock
2967 ?*/
2968 /* *INDENT-OFF* */
2969 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
2970 {
2971   .path = "set ip6 flow-hash",
2972   .short_help =
2973   "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2974   .function = set_ip6_flow_hash_command_fn,
2975 };
2976 /* *INDENT-ON* */
2977
2978 static clib_error_t *
2979 show_ip6_local_command_fn (vlib_main_t * vm,
2980                            unformat_input_t * input, vlib_cli_command_t * cmd)
2981 {
2982   ip6_main_t *im = &ip6_main;
2983   ip_lookup_main_t *lm = &im->lookup_main;
2984   int i;
2985
2986   vlib_cli_output (vm, "Protocols handled by ip6_local");
2987   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
2988     {
2989       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2990         {
2991
2992           u32 node_index = vlib_get_node (vm,
2993                                           ip6_local_node.index)->
2994             next_nodes[lm->local_next_by_ip_protocol[i]];
2995           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
2996                            node_index);
2997         }
2998     }
2999   return 0;
3000 }
3001
3002
3003
3004 /*?
3005  * Display the set of protocols handled by the local IPv6 stack.
3006  *
3007  * @cliexpar
3008  * Example of how to display local protocol table:
3009  * @cliexstart{show ip6 local}
3010  * Protocols handled by ip6_local
3011  * 17
3012  * 43
3013  * 58
3014  * 115
3015  * @cliexend
3016 ?*/
3017 /* *INDENT-OFF* */
3018 VLIB_CLI_COMMAND (show_ip6_local, static) =
3019 {
3020   .path = "show ip6 local",
3021   .function = show_ip6_local_command_fn,
3022   .short_help = "show ip6 local",
3023 };
3024 /* *INDENT-ON* */
3025
3026 #ifndef CLIB_MARCH_VARIANT
3027 int
3028 vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3029                              u32 table_index)
3030 {
3031   vnet_main_t *vnm = vnet_get_main ();
3032   vnet_interface_main_t *im = &vnm->interface_main;
3033   ip6_main_t *ipm = &ip6_main;
3034   ip_lookup_main_t *lm = &ipm->lookup_main;
3035   vnet_classify_main_t *cm = &vnet_classify_main;
3036   ip6_address_t *if_addr;
3037
3038   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3039     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3040
3041   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3042     return VNET_API_ERROR_NO_SUCH_ENTRY;
3043
3044   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3045   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3046
3047   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3048
3049   if (NULL != if_addr)
3050     {
3051       fib_prefix_t pfx = {
3052         .fp_len = 128,
3053         .fp_proto = FIB_PROTOCOL_IP6,
3054         .fp_addr.ip6 = *if_addr,
3055       };
3056       u32 fib_index;
3057
3058       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3059                                                        sw_if_index);
3060
3061
3062       if (table_index != (u32) ~ 0)
3063         {
3064           dpo_id_t dpo = DPO_INVALID;
3065
3066           dpo_set (&dpo,
3067                    DPO_CLASSIFY,
3068                    DPO_PROTO_IP6,
3069                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3070
3071           fib_table_entry_special_dpo_add (fib_index,
3072                                            &pfx,
3073                                            FIB_SOURCE_CLASSIFY,
3074                                            FIB_ENTRY_FLAG_NONE, &dpo);
3075           dpo_reset (&dpo);
3076         }
3077       else
3078         {
3079           fib_table_entry_special_remove (fib_index,
3080                                           &pfx, FIB_SOURCE_CLASSIFY);
3081         }
3082     }
3083
3084   return 0;
3085 }
3086 #endif
3087
3088 static clib_error_t *
3089 set_ip6_classify_command_fn (vlib_main_t * vm,
3090                              unformat_input_t * input,
3091                              vlib_cli_command_t * cmd)
3092 {
3093   u32 table_index = ~0;
3094   int table_index_set = 0;
3095   u32 sw_if_index = ~0;
3096   int rv;
3097
3098   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3099     {
3100       if (unformat (input, "table-index %d", &table_index))
3101         table_index_set = 1;
3102       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3103                          vnet_get_main (), &sw_if_index))
3104         ;
3105       else
3106         break;
3107     }
3108
3109   if (table_index_set == 0)
3110     return clib_error_return (0, "classify table-index must be specified");
3111
3112   if (sw_if_index == ~0)
3113     return clib_error_return (0, "interface / subif must be specified");
3114
3115   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3116
3117   switch (rv)
3118     {
3119     case 0:
3120       break;
3121
3122     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3123       return clib_error_return (0, "No such interface");
3124
3125     case VNET_API_ERROR_NO_SUCH_ENTRY:
3126       return clib_error_return (0, "No such classifier table");
3127     }
3128   return 0;
3129 }
3130
3131 /*?
3132  * Assign a classification table to an interface. The classification
3133  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3134  * commands. Once the table is create, use this command to filter packets
3135  * on an interface.
3136  *
3137  * @cliexpar
3138  * Example of how to assign a classification table to an interface:
3139  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3140 ?*/
3141 /* *INDENT-OFF* */
3142 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3143 {
3144   .path = "set ip6 classify",
3145   .short_help =
3146   "set ip6 classify intfc <interface> table-index <classify-idx>",
3147   .function = set_ip6_classify_command_fn,
3148 };
3149 /* *INDENT-ON* */
3150
3151 /*
3152  * fd.io coding-style-patch-verification: ON
3153  *
3154  * Local Variables:
3155  * eval: (c-set-style "gnu")
3156  * End:
3157  */