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/receive_dpo.h>
  52 #include <vnet/dpo/classify_dpo.h>
  53 #include <vnet/classify/vnet_classify.h>
  54 #include <vnet/pg/pg.h>
  55
  56 #ifndef CLIB_MARCH_VARIANT
  57 #include <vppinfra/bihash_template.c>
  58 #endif
  59 #include <vnet/ip/ip6_forward.h>
  60 #include <vnet/interface_output.h>
  61
  62 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
  63 #define OI_DECAP   0x80000000
  64
  65 static void
  66 ip6_add_interface_prefix_routes (ip6_main_t * im,
  67                                  u32 sw_if_index,
  68                                  u32 fib_index,
  69                                  ip6_address_t * address, u32 address_length)
  70 {
  71   ip_lookup_main_t *lm = &im->lookup_main;
  72   ip_interface_prefix_t *if_prefix;
  73
  74   /* *INDENT-OFF* */
  75   ip_interface_prefix_key_t key = {
  76     .prefix = {
  77       .fp_len = address_length,
  78       .fp_proto = FIB_PROTOCOL_IP6,
  79       .fp_addr.ip6 = {
  80         .as_u64 = {
  81           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
  82           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
  83         },
  84       },
  85     },
  86     .sw_if_index = sw_if_index,
  87   };
  88   /* *INDENT-ON* */
  89
  90   /* If prefix already set on interface, just increment ref count & return */
  91   if_prefix = ip_get_interface_prefix (lm, &key);
  92   if (if_prefix)
  93     {
  94       if_prefix->ref_count += 1;
  95       return;
  96     }
  97
  98   /* New prefix - allocate a pool entry, initialize it, add to the hash */
  99   pool_get (lm->if_prefix_pool, if_prefix);
 100   if_prefix->ref_count = 1;
 101   clib_memcpy (&if_prefix->key, &key, sizeof (key));
 102   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 103              if_prefix - lm->if_prefix_pool, 0 /* old value */ );
 104
 105   /* length < 128 - add glean */
 106   if (address_length < 128)
 107     {
 108       /* set the glean route for the prefix */
 109       fib_table_entry_update_one_path (fib_index, &key.prefix,
 110                                        FIB_SOURCE_INTERFACE,
 111                                        (FIB_ENTRY_FLAG_CONNECTED |
 112                                         FIB_ENTRY_FLAG_ATTACHED),
 113                                        DPO_PROTO_IP6,
 114                                        /* No next-hop address */
 115                                        NULL, sw_if_index,
 116                                        /* invalid FIB index */
 117                                        ~0, 1,
 118                                        /* no out-label stack */
 119                                        NULL, FIB_ROUTE_PATH_FLAG_NONE);
 120     }
 121 }
 122
 123 static void
 124 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 125                           ip6_main_t * im, u32 fib_index,
 126                           ip_interface_address_t * a)
 127 {
 128   ip_lookup_main_t *lm = &im->lookup_main;
 129   ip6_address_t *address = ip_interface_address_get_address (lm, a);
 130   fib_prefix_t pfx = {
 131     .fp_len = a->address_length,
 132     .fp_proto = FIB_PROTOCOL_IP6,
 133     .fp_addr.ip6 = *address,
 134   };
 135
 136   /* set special routes for the prefix if needed */
 137   ip6_add_interface_prefix_routes (im, sw_if_index, fib_index,
 138                                    address, a->address_length);
 139
 140   pfx.fp_len = 128;
 141   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 142     {
 143       u32 classify_table_index =
 144         lm->classify_table_index_by_sw_if_index[sw_if_index];
 145       if (classify_table_index != (u32) ~ 0)
 146         {
 147           dpo_id_t dpo = DPO_INVALID;
 148
 149           dpo_set (&dpo,
 150                    DPO_CLASSIFY,
 151                    DPO_PROTO_IP6,
 152                    classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
 153
 154           fib_table_entry_special_dpo_add (fib_index,
 155                                            &pfx,
 156                                            FIB_SOURCE_CLASSIFY,
 157                                            FIB_ENTRY_FLAG_NONE, &dpo);
 158           dpo_reset (&dpo);
 159         }
 160     }
 161
 162   fib_table_entry_update_one_path (fib_index, &pfx,
 163                                    FIB_SOURCE_INTERFACE,
 164                                    (FIB_ENTRY_FLAG_CONNECTED |
 165                                     FIB_ENTRY_FLAG_LOCAL),
 166                                    DPO_PROTO_IP6,
 167                                    &pfx.fp_addr,
 168                                    sw_if_index, ~0,
 169                                    1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 170 }
 171
 172 static void
 173 ip6_del_interface_prefix_routes (ip6_main_t * im,
 174                                  u32 sw_if_index,
 175                                  u32 fib_index,
 176                                  ip6_address_t * address, u32 address_length)
 177 {
 178   ip_lookup_main_t *lm = &im->lookup_main;
 179   ip_interface_prefix_t *if_prefix;
 180
 181   /* *INDENT-OFF* */
 182   ip_interface_prefix_key_t key = {
 183     .prefix = {
 184       .fp_len = address_length,
 185       .fp_proto = FIB_PROTOCOL_IP6,
 186       .fp_addr.ip6 = {
 187         .as_u64 = {
 188           address->as_u64[0] & im->fib_masks[address_length].as_u64[0],
 189           address->as_u64[1] & im->fib_masks[address_length].as_u64[1],
 190         },
 191       },
 192     },
 193     .sw_if_index = sw_if_index,
 194   };
 195   /* *INDENT-ON* */
 196
 197   if_prefix = ip_get_interface_prefix (lm, &key);
 198   if (!if_prefix)
 199     {
 200       clib_warning ("Prefix not found while deleting %U",
 201                     format_ip4_address_and_length, address, address_length);
 202       return;
 203     }
 204
 205   /* If not deleting last intf addr in prefix, decrement ref count & return */
 206   if_prefix->ref_count -= 1;
 207   if (if_prefix->ref_count > 0)
 208     return;
 209
 210   /* length <= 128, delete glean route */
 211   if (address_length <= 128)
 212     {
 213       /* remove glean route for prefix */
 214       fib_table_entry_delete (fib_index, &key.prefix, FIB_SOURCE_INTERFACE);
 215     }
 216
 217   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */ );
 218   pool_put (lm->if_prefix_pool, if_prefix);
 219 }
 220
 221 static void
 222 ip6_del_interface_routes (u32 sw_if_index, ip6_main_t * im,
 223                           u32 fib_index,
 224                           ip6_address_t * address, u32 address_length)
 225 {
 226   fib_prefix_t pfx = {
 227     .fp_len = 128,
 228     .fp_proto = FIB_PROTOCOL_IP6,
 229     .fp_addr.ip6 = *address,
 230   };
 231
 232   /* delete special routes for the prefix if needed */
 233   ip6_del_interface_prefix_routes (im, sw_if_index, fib_index,
 234                                    address, address_length);
 235
 236   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 237 }
 238
 239 #ifndef CLIB_MARCH_VARIANT
 240 void
 241 ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 242 {
 243   ip6_main_t *im = &ip6_main;
 244   vnet_main_t *vnm = vnet_get_main ();
 245   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 246
 247   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 248
 249   /*
 250    * enable/disable only on the 1<->0 transition
 251    */
 252   if (is_enable)
 253     {
 254       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 255         return;
 256     }
 257   else
 258     {
 259       /* The ref count is 0 when an address is removed from an interface that has
 260        * no address - this is not a ciritical error */
 261       if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
 262           0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 263         return;
 264     }
 265
 266   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 267                                !is_enable, 0, 0);
 268
 269   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 270                                sw_if_index, !is_enable, 0, 0);
 271
 272   if (is_enable)
 273     hi->l3_if_count++;
 274   else if (hi->l3_if_count)
 275     hi->l3_if_count--;
 276 }
 277
 278 /* get first interface address */
 279 ip6_address_t *
 280 ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index)
 281 {
 282   ip_lookup_main_t *lm = &im->lookup_main;
 283   ip_interface_address_t *ia = 0;
 284   ip6_address_t *result = 0;
 285
 286   /* *INDENT-OFF* */
 287   foreach_ip_interface_address (lm, ia, sw_if_index,
 288                                 1 /* honor unnumbered */,
 289   ({
 290     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 291     result = a;
 292     break;
 293   }));
 294   /* *INDENT-ON* */
 295   return result;
 296 }
 297
 298 clib_error_t *
 299 ip6_add_del_interface_address (vlib_main_t * vm,
 300                                u32 sw_if_index,
 301                                ip6_address_t * address,
 302                                u32 address_length, u32 is_del)
 303 {
 304   vnet_main_t *vnm = vnet_get_main ();
 305   ip6_main_t *im = &ip6_main;
 306   ip_lookup_main_t *lm = &im->lookup_main;
 307   clib_error_t *error = NULL;
 308   u32 if_address_index;
 309   ip6_address_fib_t ip6_af, *addr_fib = 0;
 310   const ip6_address_t *ll_addr;
 311
 312   error = vnet_sw_interface_supports_addressing (vnm, sw_if_index);
 313   if (error)
 314     {
 315       vnm->api_errno = VNET_API_ERROR_UNSUPPORTED;
 316       return error;
 317     }
 318
 319   if (ip6_address_is_link_local_unicast (address))
 320     {
 321       if (address_length != 128)
 322         {
 323           vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
 324           return
 325             clib_error_create
 326             ("prefix length of link-local address must be 128");
 327         }
 328       if (!is_del)
 329         {
 330           int rv;
 331
 332           rv = ip6_link_set_local_address (sw_if_index, address);
 333
 334           if (rv)
 335             {
 336               vnm->api_errno = rv;
 337               return clib_error_create ("address not assignable");
 338             }
 339         }
 340       else
 341         {
 342           ll_addr = ip6_get_link_local_address (sw_if_index);
 343           if (ip6_address_is_equal (ll_addr, address))
 344             {
 345               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_DELETABLE;
 346               return clib_error_create ("address not deletable");
 347             }
 348           else
 349             {
 350               vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 351               return clib_error_create ("address not found");
 352             }
 353         }
 354
 355       return (NULL);
 356     }
 357
 358   ip6_addr_fib_init (&ip6_af, address,
 359                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 360   vec_add1 (addr_fib, ip6_af);
 361
 362   /* *INDENT-OFF* */
 363   if (!is_del)
 364     {
 365       /* When adding an address check that it does not conflict
 366          with an existing address on any interface in this table. */
 367       ip_interface_address_t *ia;
 368       vnet_sw_interface_t *sif;
 369
 370       pool_foreach (sif, vnm->interface_main.sw_interfaces)
 371        {
 372           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 373               im->fib_index_by_sw_if_index[sif->sw_if_index])
 374             {
 375               foreach_ip_interface_address
 376                 (&im->lookup_main, ia, sif->sw_if_index,
 377                  0 /* honor unnumbered */ ,
 378                  ({
 379                    ip6_address_t * x =
 380                      ip_interface_address_get_address
 381                      (&im->lookup_main, ia);
 382
 383                    if (ip6_destination_matches_route
 384                        (im, address, x, ia->address_length) ||
 385                        ip6_destination_matches_route (im,
 386                                                       x,
 387                                                       address,
 388                                                       address_length))
 389                      {
 390                        /* an intf may have >1 addr from the same prefix */
 391                        if ((sw_if_index == sif->sw_if_index) &&
 392                            (ia->address_length == address_length) &&
 393                            !ip6_address_is_equal (x, address))
 394                          continue;
 395
 396                        if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 397                          /* if the address we're comparing against is stale
 398                           * then the CP has not added this one back yet, maybe
 399                           * it never will, so we have to assume it won't and
 400                           * ignore it. if it does add it back, then it will fail
 401                           * because this one is now present */
 402                          continue;
 403
 404                        /* error if the length or intf was different */
 405                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 406                        error =  clib_error_create
 407                          ("failed to add %U which conflicts with %U for interface %U",
 408                           format_ip6_address_and_length, address,
 409                           address_length,
 410                           format_ip6_address_and_length, x,
 411                           ia->address_length,
 412                           format_vnet_sw_if_index_name, vnm,
 413                           sif->sw_if_index);
 414                        goto done;
 415                      }
 416                  }));
 417             }
 418       }
 419     }
 420   /* *INDENT-ON* */
 421
 422   if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
 423
 424   if (is_del)
 425     {
 426       if (~0 == if_address_index)
 427         {
 428           vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 429           error = clib_error_create ("%U not found for interface %U",
 430                                      lm->format_address_and_length,
 431                                      addr_fib, address_length,
 432                                      format_vnet_sw_if_index_name, vnm,
 433                                      sw_if_index);
 434           goto done;
 435         }
 436
 437       error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
 438                                         address_length, sw_if_index);
 439       if (error)
 440         goto done;
 441     }
 442   else
 443     {
 444       if (~0 != if_address_index)
 445         {
 446           ip_interface_address_t *ia;
 447
 448           ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
 449
 450           if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 451             {
 452               if (ia->sw_if_index == sw_if_index)
 453                 {
 454                   /* re-adding an address during the replace action.
 455                    * consdier this the update. clear the flag and
 456                    * we're done */
 457                   ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
 458                   goto done;
 459                 }
 460               else
 461                 {
 462                   /* The prefix is moving from one interface to another.
 463                    * delete the stale and add the new */
 464                   ip6_add_del_interface_address (vm,
 465                                                  ia->sw_if_index,
 466                                                  address, address_length, 1);
 467                   ia = NULL;
 468                   error = ip_interface_address_add (lm, sw_if_index,
 469                                                     addr_fib, address_length,
 470                                                     &if_address_index);
 471                 }
 472             }
 473           else
 474             {
 475               vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 476               error = clib_error_create
 477                 ("Prefix %U already found on interface %U",
 478                  lm->format_address_and_length, addr_fib, address_length,
 479                  format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
 480             }
 481         }
 482       else
 483         error = ip_interface_address_add (lm, sw_if_index,
 484                                           addr_fib, address_length,
 485                                           &if_address_index);
 486     }
 487
 488   if (error)
 489     goto done;
 490
 491   ip6_sw_interface_enable_disable (sw_if_index, !is_del);
 492   if (!is_del)
 493     ip6_link_enable (sw_if_index, NULL);
 494
 495   /* intf addr routes are added/deleted on admin up/down */
 496   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 497     {
 498       if (is_del)
 499         ip6_del_interface_routes (sw_if_index,
 500                                   im, ip6_af.fib_index, address,
 501                                   address_length);
 502       else
 503         ip6_add_interface_routes (vnm, sw_if_index,
 504                                   im, ip6_af.fib_index,
 505                                   pool_elt_at_index (lm->if_address_pool,
 506                                                      if_address_index));
 507     }
 508
 509   ip6_add_del_interface_address_callback_t *cb;
 510   vec_foreach (cb, im->add_del_interface_address_callbacks)
 511     cb->function (im, cb->function_opaque, sw_if_index,
 512                   address, address_length, if_address_index, is_del);
 513
 514   if (is_del)
 515     ip6_link_disable (sw_if_index);
 516
 517 done:
 518   vec_free (addr_fib);
 519   return error;
 520 }
 521
 522 #endif
 523
 524 static clib_error_t *
 525 ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 526 {
 527   ip6_main_t *im = &ip6_main;
 528   ip_interface_address_t *ia;
 529   ip6_address_t *a;
 530   u32 is_admin_up, fib_index;
 531
 532   vec_validate_init_empty (im->
 533                            lookup_main.if_address_pool_index_by_sw_if_index,
 534                            sw_if_index, ~0);
 535
 536   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 537
 538   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 539
 540   /* *INDENT-OFF* */
 541   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 542                                 0 /* honor unnumbered */,
 543   ({
 544     a = ip_interface_address_get_address (&im->lookup_main, ia);
 545     if (is_admin_up)
 546       ip6_add_interface_routes (vnm, sw_if_index,
 547                                 im, fib_index,
 548                                 ia);
 549     else
 550       ip6_del_interface_routes (sw_if_index, im, fib_index,
 551                                 a, ia->address_length);
 552   }));
 553   /* *INDENT-ON* */
 554
 555   return 0;
 556 }
 557
 558 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 559
 560 /* Built-in ip6 unicast rx feature path definition */
 561 /* *INDENT-OFF* */
 562 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 563 {
 564   .arc_name  = "ip6-unicast",
 565   .start_nodes = VNET_FEATURES ("ip6-input"),
 566   .last_in_arc = "ip6-lookup",
 567   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 568 };
 569
 570 VNET_FEATURE_INIT (ip6_flow_classify, static) =
 571 {
 572   .arc_name = "ip6-unicast",
 573   .node_name = "ip6-flow-classify",
 574   .runs_before = VNET_FEATURES ("ip6-inacl"),
 575 };
 576
 577 VNET_FEATURE_INIT (ip6_inacl, static) =
 578 {
 579   .arc_name = "ip6-unicast",
 580   .node_name = "ip6-inacl",
 581   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 582 };
 583
 584 VNET_FEATURE_INIT (ip6_policer_classify, static) =
 585 {
 586   .arc_name = "ip6-unicast",
 587   .node_name = "ip6-policer-classify",
 588   .runs_before = VNET_FEATURES ("ipsec6-input-feature"),
 589 };
 590
 591 VNET_FEATURE_INIT (ip6_ipsec, static) =
 592 {
 593   .arc_name = "ip6-unicast",
 594   .node_name = "ipsec6-input-feature",
 595   .runs_before = VNET_FEATURES ("l2tp-decap"),
 596 };
 597
 598 VNET_FEATURE_INIT (ip6_l2tp, static) =
 599 {
 600   .arc_name = "ip6-unicast",
 601   .node_name = "l2tp-decap",
 602   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 603 };
 604
 605 VNET_FEATURE_INIT (ip6_vpath, static) =
 606 {
 607   .arc_name = "ip6-unicast",
 608   .node_name = "vpath-input-ip6",
 609   .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"),
 610 };
 611
 612 VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
 613 {
 614   .arc_name = "ip6-unicast",
 615   .node_name = "ip6-vxlan-bypass",
 616   .runs_before = VNET_FEATURES ("ip6-lookup"),
 617 };
 618
 619 VNET_FEATURE_INIT (ip6_not_enabled, static) =
 620 {
 621   .arc_name = "ip6-unicast",
 622   .node_name = "ip6-not-enabled",
 623   .runs_before = VNET_FEATURES ("ip6-lookup"),
 624 };
 625
 626 VNET_FEATURE_INIT (ip6_lookup, static) =
 627 {
 628   .arc_name = "ip6-unicast",
 629   .node_name = "ip6-lookup",
 630   .runs_before = 0,  /*last feature*/
 631 };
 632
 633 /* Built-in ip6 multicast rx feature path definition (none now) */
 634 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 635 {
 636   .arc_name  = "ip6-multicast",
 637   .start_nodes = VNET_FEATURES ("ip6-input"),
 638   .last_in_arc = "ip6-mfib-forward-lookup",
 639   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 640 };
 641
 642 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 643   .arc_name = "ip6-multicast",
 644   .node_name = "vpath-input-ip6",
 645   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 646 };
 647
 648 VNET_FEATURE_INIT (ip6_not_enabled_mc, static) = {
 649   .arc_name = "ip6-multicast",
 650   .node_name = "ip6-not-enabled",
 651   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 652 };
 653
 654 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 655   .arc_name = "ip6-multicast",
 656   .node_name = "ip6-mfib-forward-lookup",
 657   .runs_before = 0, /* last feature */
 658 };
 659
 660 /* Built-in ip4 tx feature path definition */
 661 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 662 {
 663   .arc_name  = "ip6-output",
 664   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain", "ip6-dvr-dpo"),
 665   .last_in_arc = "interface-output",
 666   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 667 };
 668
 669 VNET_FEATURE_INIT (ip6_outacl, static) = {
 670   .arc_name = "ip6-output",
 671   .node_name = "ip6-outacl",
 672   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 673 };
 674
 675 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 676   .arc_name = "ip6-output",
 677   .node_name = "ipsec6-output-feature",
 678   .runs_before = VNET_FEATURES ("interface-output"),
 679 };
 680
 681 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 682   .arc_name = "ip6-output",
 683   .node_name = "interface-output",
 684   .runs_before = 0, /* not before any other features */
 685 };
 686 /* *INDENT-ON* */
 687
 688 static clib_error_t *
 689 ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 690 {
 691   ip6_main_t *im = &ip6_main;
 692
 693   vec_validate_init_empty (im->fib_index_by_sw_if_index, sw_if_index, ~0);
 694   vec_validate_init_empty (im->mfib_index_by_sw_if_index, sw_if_index, ~0);
 695
 696   if (is_add)
 697     {
 698       /* Fill in lookup tables with default table (0). */
 699       im->fib_index_by_sw_if_index[sw_if_index] = 0;
 700       im->mfib_index_by_sw_if_index[sw_if_index] = 0;
 701     }
 702   else
 703     {
 704       /* Ensure that IPv6 is disabled */
 705       ip6_main_t *im6 = &ip6_main;
 706       ip_lookup_main_t *lm6 = &im6->lookup_main;
 707       ip_interface_address_t *ia = 0;
 708       ip6_address_t *address;
 709       vlib_main_t *vm = vlib_get_main ();
 710
 711       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 712       /* *INDENT-OFF* */
 713       foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
 714       ({
 715         address = ip_interface_address_get_address (lm6, ia);
 716         ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 717       }));
 718       /* *INDENT-ON* */
 719       ip6_mfib_interface_enable_disable (sw_if_index, 0);
 720     }
 721
 722   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 723                                is_add, 0, 0);
 724
 725   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 726                                sw_if_index, is_add, 0, 0);
 727
 728   return /* no error */ 0;
 729 }
 730
 731 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 732
 733 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 734                                 vlib_node_runtime_t * node,
 735                                 vlib_frame_t * frame)
 736 {
 737   return ip6_lookup_inline (vm, node, frame);
 738 }
 739
 740 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 741
 742 /* *INDENT-OFF* */
 743 VLIB_REGISTER_NODE (ip6_lookup_node) =
 744 {
 745   .name = "ip6-lookup",
 746   .vector_size = sizeof (u32),
 747   .format_trace = format_ip6_lookup_trace,
 748   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 749   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 750 };
 751 /* *INDENT-ON* */
 752
 753 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 754                                       vlib_node_runtime_t * node,
 755                                       vlib_frame_t * frame)
 756 {
 757   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 758   u32 n_left, *from;
 759   u32 thread_index = vm->thread_index;
 760   ip6_main_t *im = &ip6_main;
 761   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 762   u16 nexts[VLIB_FRAME_SIZE], *next;
 763
 764   from = vlib_frame_vector_args (frame);
 765   n_left = frame->n_vectors;
 766   next = nexts;
 767
 768   vlib_get_buffers (vm, from, bufs, n_left);
 769
 770   while (n_left >= 4)
 771     {
 772       const load_balance_t *lb0, *lb1;
 773       const ip6_header_t *ip0, *ip1;
 774       u32 lbi0, hc0, lbi1, hc1;
 775       const dpo_id_t *dpo0, *dpo1;
 776
 777       /* Prefetch next iteration. */
 778       {
 779         vlib_prefetch_buffer_header (b[2], STORE);
 780         vlib_prefetch_buffer_header (b[3], STORE);
 781
 782         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 783         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 784       }
 785
 786       ip0 = vlib_buffer_get_current (b[0]);
 787       ip1 = vlib_buffer_get_current (b[1]);
 788       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 789       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 790
 791       lb0 = load_balance_get (lbi0);
 792       lb1 = load_balance_get (lbi1);
 793
 794       /*
 795        * this node is for via FIBs we can re-use the hash value from the
 796        * to node if present.
 797        * We don't want to use the same hash value at each level in the recursion
 798        * graph as that would lead to polarisation
 799        */
 800       hc0 = hc1 = 0;
 801
 802       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 803         {
 804           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 805             {
 806               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 807                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 808             }
 809           else
 810             {
 811               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 812                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 813             }
 814           dpo0 = load_balance_get_fwd_bucket
 815             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 816         }
 817       else
 818         {
 819           dpo0 = load_balance_get_bucket_i (lb0, 0);
 820         }
 821       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 822         {
 823           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 824             {
 825               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 826                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 827             }
 828           else
 829             {
 830               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 831                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 832             }
 833           dpo1 = load_balance_get_fwd_bucket
 834             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 835         }
 836       else
 837         {
 838           dpo1 = load_balance_get_bucket_i (lb1, 0);
 839         }
 840
 841       next[0] = dpo0->dpoi_next_node;
 842       next[1] = dpo1->dpoi_next_node;
 843
 844       /* Only process the HBH Option Header if explicitly configured to do so */
 845       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 846         {
 847           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 848             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 849         }
 850       /* Only process the HBH Option Header if explicitly configured to do so */
 851       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 852         {
 853           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 854             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 855         }
 856
 857       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 858       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 859
 860       vlib_increment_combined_counter
 861         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 862       vlib_increment_combined_counter
 863         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 864
 865       b += 2;
 866       next += 2;
 867       n_left -= 2;
 868     }
 869
 870   while (n_left > 0)
 871     {
 872       const load_balance_t *lb0;
 873       const ip6_header_t *ip0;
 874       const dpo_id_t *dpo0;
 875       u32 lbi0, hc0;
 876
 877       ip0 = vlib_buffer_get_current (b[0]);
 878       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 879
 880       lb0 = load_balance_get (lbi0);
 881
 882       hc0 = 0;
 883       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 884         {
 885           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 886             {
 887               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 888                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 889             }
 890           else
 891             {
 892               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 893                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 894             }
 895           dpo0 = load_balance_get_fwd_bucket
 896             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 897         }
 898       else
 899         {
 900           dpo0 = load_balance_get_bucket_i (lb0, 0);
 901         }
 902
 903       next[0] = dpo0->dpoi_next_node;
 904       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 905
 906       /* Only process the HBH Option Header if explicitly configured to do so */
 907       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 908         {
 909           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 910             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 911         }
 912
 913       vlib_increment_combined_counter
 914         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 915
 916       b += 1;
 917       next += 1;
 918       n_left -= 1;
 919     }
 920
 921   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 922
 923   if (node->flags & VLIB_NODE_FLAG_TRACE)
 924     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 925
 926   return frame->n_vectors;
 927 }
 928
 929 /* *INDENT-OFF* */
 930 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 931 {
 932   .name = "ip6-load-balance",
 933   .vector_size = sizeof (u32),
 934   .sibling_of = "ip6-lookup",
 935   .format_trace = format_ip6_lookup_trace,
 936 };
 937 /* *INDENT-ON* */
 938
 939 typedef struct
 940 {
 941   /* Adjacency taken. */
 942   u32 adj_index;
 943   u32 flow_hash;
 944   u32 fib_index;
 945
 946   /* Packet data, possibly *after* rewrite. */
 947   u8 packet_data[128 - 1 * sizeof (u32)];
 948 }
 949 ip6_forward_next_trace_t;
 950
 951 #ifndef CLIB_MARCH_VARIANT
 952 u8 *
 953 format_ip6_forward_next_trace (u8 * s, va_list * args)
 954 {
 955   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 956   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 957   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 958   u32 indent = format_get_indent (s);
 959
 960   s = format (s, "%Ufib:%d adj:%d flow:%d",
 961               format_white_space, indent,
 962               t->fib_index, t->adj_index, t->flow_hash);
 963   s = format (s, "\n%U%U",
 964               format_white_space, indent,
 965               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 966   return s;
 967 }
 968 #endif
 969
 970 static u8 *
 971 format_ip6_lookup_trace (u8 * s, va_list * args)
 972 {
 973   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 974   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 975   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 976   u32 indent = format_get_indent (s);
 977
 978   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 979               t->fib_index, t->adj_index, t->flow_hash);
 980   s = format (s, "\n%U%U",
 981               format_white_space, indent,
 982               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 983   return s;
 984 }
 985
 986
 987 static u8 *
 988 format_ip6_rewrite_trace (u8 * s, va_list * args)
 989 {
 990   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 991   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 992   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 993   u32 indent = format_get_indent (s);
 994
 995   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 996               t->fib_index, t->adj_index, format_ip_adjacency,
 997               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
 998   s = format (s, "\n%U%U",
 999               format_white_space, indent,
1000               format_ip_adjacency_packet_data,
1001               t->packet_data, sizeof (t->packet_data));
1002   return s;
1003 }
1004
1005 /* Common trace function for all ip6-forward next nodes. */
1006 #ifndef CLIB_MARCH_VARIANT
1007 void
1008 ip6_forward_next_trace (vlib_main_t * vm,
1009                         vlib_node_runtime_t * node,
1010                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1011 {
1012   u32 *from, n_left;
1013   ip6_main_t *im = &ip6_main;
1014
1015   n_left = frame->n_vectors;
1016   from = vlib_frame_vector_args (frame);
1017
1018   while (n_left >= 4)
1019     {
1020       u32 bi0, bi1;
1021       vlib_buffer_t *b0, *b1;
1022       ip6_forward_next_trace_t *t0, *t1;
1023
1024       /* Prefetch next iteration. */
1025       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1026       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1027
1028       bi0 = from[0];
1029       bi1 = from[1];
1030
1031       b0 = vlib_get_buffer (vm, bi0);
1032       b1 = vlib_get_buffer (vm, bi1);
1033
1034       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1035         {
1036           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1037           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1038           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1039           t0->fib_index =
1040             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1041              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1042             vec_elt (im->fib_index_by_sw_if_index,
1043                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1044
1045           clib_memcpy_fast (t0->packet_data,
1046                             vlib_buffer_get_current (b0),
1047                             sizeof (t0->packet_data));
1048         }
1049       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1050         {
1051           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1052           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1053           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1054           t1->fib_index =
1055             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1056              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1057             vec_elt (im->fib_index_by_sw_if_index,
1058                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1059
1060           clib_memcpy_fast (t1->packet_data,
1061                             vlib_buffer_get_current (b1),
1062                             sizeof (t1->packet_data));
1063         }
1064       from += 2;
1065       n_left -= 2;
1066     }
1067
1068   while (n_left >= 1)
1069     {
1070       u32 bi0;
1071       vlib_buffer_t *b0;
1072       ip6_forward_next_trace_t *t0;
1073
1074       bi0 = from[0];
1075
1076       b0 = vlib_get_buffer (vm, bi0);
1077
1078       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1079         {
1080           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1081           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1082           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1083           t0->fib_index =
1084             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1085              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1086             vec_elt (im->fib_index_by_sw_if_index,
1087                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1088
1089           clib_memcpy_fast (t0->packet_data,
1090                             vlib_buffer_get_current (b0),
1091                             sizeof (t0->packet_data));
1092         }
1093       from += 1;
1094       n_left -= 1;
1095     }
1096 }
1097
1098 /* Compute TCP/UDP/ICMP6 checksum in software. */
1099 u16
1100 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1101                                    ip6_header_t * ip0, int *bogus_lengthp)
1102 {
1103   ip_csum_t sum0 = 0;
1104   u16 payload_length, payload_length_host_byte_order;
1105   u32 i;
1106   u32 headers_size = sizeof (ip0[0]);
1107   u8 *data_this_buffer;
1108   u8 next_hdr = ip0->protocol;
1109
1110   ASSERT (bogus_lengthp);
1111   *bogus_lengthp = 0;
1112
1113   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1114   data_this_buffer = (u8 *) (ip0 + 1);
1115   payload_length = ip0->payload_length;
1116
1117   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1118    * or UDP-Ping packets */
1119   if (PREDICT_FALSE (next_hdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1120     {
1121       u32 skip_bytes;
1122       ip6_hop_by_hop_ext_t *ext_hdr =
1123         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1124
1125       /* validate really icmp6 next */
1126       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1127               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1128
1129       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1130       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1131
1132       payload_length_host_byte_order -= skip_bytes;
1133       headers_size += skip_bytes;
1134
1135       /* pseudo-header adjustments:
1136        *   exclude ext header bytes from payload length
1137        *   use payload IP proto rather than ext header IP proto
1138        */
1139       payload_length = clib_host_to_net_u16 (payload_length_host_byte_order);
1140       next_hdr = ext_hdr->next_hdr;
1141     }
1142
1143   /* Initialize checksum with ip pseudo-header. */
1144   sum0 = payload_length + clib_host_to_net_u16 (next_hdr);
1145
1146   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1147     {
1148       sum0 = ip_csum_with_carry
1149         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1150       sum0 = ip_csum_with_carry
1151         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1152     }
1153
1154   if (p0)
1155     return ip_calculate_l4_checksum (vm, p0, sum0,
1156                                      payload_length_host_byte_order,
1157                                      (u8 *) ip0, headers_size, NULL);
1158   else
1159     return ip_calculate_l4_checksum (vm, 0, sum0,
1160                                      payload_length_host_byte_order, NULL, 0,
1161                                      data_this_buffer);
1162 }
1163
1164 u32
1165 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1166 {
1167   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1168   udp_header_t *udp0;
1169   u16 sum16;
1170   int bogus_length;
1171
1172   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1173   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1174           || ip0->protocol == IP_PROTOCOL_ICMP6
1175           || ip0->protocol == IP_PROTOCOL_UDP
1176           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1177
1178   udp0 = (void *) (ip0 + 1);
1179   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1180     {
1181       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1182                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1183       return p0->flags;
1184     }
1185
1186   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1187
1188   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1189                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1190
1191   return p0->flags;
1192 }
1193 #endif
1194
1195 /**
1196  * @brief returns number of links on which src is reachable.
1197  */
1198 always_inline int
1199 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1200 {
1201   const load_balance_t *lb0;
1202   index_t lbi;
1203   u32 fib_index;
1204
1205   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1206                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1207   fib_index =
1208     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1209     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1210
1211   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1212   lb0 = load_balance_get (lbi);
1213
1214   return (fib_urpf_check_size (lb0->lb_urpf));
1215 }
1216
1217 always_inline u8
1218 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1219                            u32 * udp_offset0)
1220 {
1221   u32 proto0;
1222   proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0);
1223   if (proto0 != IP_PROTOCOL_UDP)
1224     {
1225       proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0);
1226       proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0;
1227     }
1228   return proto0;
1229 }
1230
1231 /* *INDENT-OFF* */
1232 VNET_FEATURE_ARC_INIT (ip6_local) = {
1233   .arc_name = "ip6-local",
1234   .start_nodes = VNET_FEATURES ("ip6-local", "ip6-receive"),
1235 };
1236 /* *INDENT-ON* */
1237
1238 static_always_inline u8
1239 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1240 {
1241
1242   u16 payload_length_host_byte_order;
1243   u32 n_this_buffer, n_bytes_left;
1244   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1245   u32 headers_size = sizeof (ip0[0]);
1246   u8 *data_this_buffer;
1247
1248
1249   data_this_buffer = (u8 *) (ip0 + 1);
1250
1251   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1252
1253   /* validate really icmp6 next */
1254
1255   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1256       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1257     return 0;
1258
1259
1260   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1261   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1262
1263
1264   u32 n_ip_bytes_this_buffer =
1265     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1266   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1267     {
1268       n_this_buffer = p0->current_length > headers_size ?
1269         n_ip_bytes_this_buffer - headers_size : 0;
1270     }
1271
1272   n_bytes_left -= n_this_buffer;
1273   n_bytes_left -= p0->total_length_not_including_first_buffer;
1274
1275   if (n_bytes_left == 0)
1276     return 0;
1277   else
1278     return 1;
1279 }
1280
1281 always_inline uword
1282 ip6_local_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1283                   vlib_frame_t *frame, int head_of_feature_arc,
1284                   int is_receive_dpo)
1285 {
1286   ip6_main_t *im = &ip6_main;
1287   ip_lookup_main_t *lm = &im->lookup_main;
1288   u32 *from, n_left_from;
1289   vlib_node_runtime_t *error_node =
1290     vlib_node_get_runtime (vm, ip6_input_node.index);
1291   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1292   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1293   u16 nexts[VLIB_FRAME_SIZE], *next;
1294
1295   from = vlib_frame_vector_args (frame);
1296   n_left_from = frame->n_vectors;
1297
1298   if (node->flags & VLIB_NODE_FLAG_TRACE)
1299     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1300
1301   vlib_get_buffers (vm, from, bufs, n_left_from);
1302   b = bufs;
1303   next = nexts;
1304
1305   while (n_left_from > 2)
1306     {
1307       /* Prefetch next iteration. */
1308       if (n_left_from >= 6)
1309         {
1310           vlib_prefetch_buffer_header (b[4], STORE);
1311           vlib_prefetch_buffer_header (b[5], STORE);
1312           vlib_prefetch_buffer_data (b[2], LOAD);
1313           vlib_prefetch_buffer_data (b[3], LOAD);
1314         }
1315
1316       ip6_error_t error[2];
1317       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1318       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1319
1320       ip6_header_t *ip[2];
1321       ip[0] = vlib_buffer_get_current (b[0]);
1322       ip[1] = vlib_buffer_get_current (b[1]);
1323
1324       if (head_of_feature_arc)
1325         {
1326           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1327           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1328
1329           u8 type[2];
1330           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1331           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1332
1333           u32 flags[2];
1334           flags[0] = b[0]->flags;
1335           flags[1] = b[1]->flags;
1336
1337           vnet_buffer_oflags_t oflags[2];
1338           oflags[0] = vnet_buffer (b[0])->oflags;
1339           oflags[1] = vnet_buffer (b[1])->oflags;
1340
1341           u32 l4_offload[2];
1342           l4_offload[0] = (flags[0] & VNET_BUFFER_F_OFFLOAD) &&
1343                           (oflags[0] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1344                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1345           l4_offload[1] = (flags[1] & VNET_BUFFER_F_OFFLOAD) &&
1346                           (oflags[1] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1347                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1348
1349           u32 good_l4_csum[2];
1350           good_l4_csum[0] =
1351             (flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[0];
1352           good_l4_csum[1] =
1353             (flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[1];
1354
1355           u32 udp_offset[2] = { };
1356           u8 is_tcp_udp[2];
1357           is_tcp_udp[0] =
1358             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1359           is_tcp_udp[1] =
1360             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1361           i16 len_diff[2] = { 0 };
1362           if (PREDICT_TRUE (is_tcp_udp[0]))
1363             {
1364               udp_header_t *udp =
1365                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1366               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1367                 && udp->checksum == 0;
1368               /* optimistically verify UDP length. */
1369               u16 ip_len, udp_len;
1370               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1371               udp_len = clib_net_to_host_u16 (udp->length);
1372               len_diff[0] = ip_len - udp_len;
1373             }
1374           if (PREDICT_TRUE (is_tcp_udp[1]))
1375             {
1376               udp_header_t *udp =
1377                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1378               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1379                 && udp->checksum == 0;
1380               /* optimistically verify UDP length. */
1381               u16 ip_len, udp_len;
1382               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1383               udp_len = clib_net_to_host_u16 (udp->length);
1384               len_diff[1] = ip_len - udp_len;
1385             }
1386
1387           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1388           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1389
1390           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1391           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1392
1393           u8 need_csum[2];
1394           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1395             && !good_l4_csum[0]
1396             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1397           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1398             && !good_l4_csum[1]
1399             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1400           if (PREDICT_FALSE (need_csum[0]))
1401             {
1402               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1403               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1404               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1405             }
1406           else
1407             {
1408               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1409                 error[0] = IP6_ERROR_BAD_LENGTH;
1410             }
1411           if (PREDICT_FALSE (need_csum[1]))
1412             {
1413               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1414               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1415               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1416             }
1417           else
1418             {
1419               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1420                 error[1] = IP6_ERROR_BAD_LENGTH;
1421             }
1422
1423
1424           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1425
1426           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1427
1428           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1429                          IP6_ERROR_UDP_CHECKSUM,
1430                          "Wrong IP6 errors constants");
1431           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1432                          IP6_ERROR_ICMP_CHECKSUM,
1433                          "Wrong IP6 errors constants");
1434
1435           error[0] =
1436             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1437           error[1] =
1438             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1439
1440           /* Drop packets from unroutable hosts. */
1441           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1442           u8 unroutable[2];
1443           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1444             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1445             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1446           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1447             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1448             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1449           if (PREDICT_FALSE (unroutable[0]))
1450             {
1451               error[0] =
1452                 !ip6_urpf_loose_check (im, b[0],
1453                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1454                 : error[0];
1455             }
1456           if (PREDICT_FALSE (unroutable[1]))
1457             {
1458               error[1] =
1459                 !ip6_urpf_loose_check (im, b[1],
1460                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1461                 : error[1];
1462             }
1463
1464           vnet_buffer (b[0])->ip.fib_index =
1465             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1466             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1467             vnet_buffer (b[0])->ip.fib_index;
1468           vnet_buffer (b[1])->ip.fib_index =
1469             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1470             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1471             vnet_buffer (b[1])->ip.fib_index;
1472           if (is_receive_dpo)
1473             {
1474               const receive_dpo_t *rd0, *rd1;
1475               rd0 =
1476                 receive_dpo_get (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
1477               rd1 =
1478                 receive_dpo_get (vnet_buffer (b[1])->ip.adj_index[VLIB_TX]);
1479               vnet_buffer (b[0])->ip.rx_sw_if_index = rd0->rd_sw_if_index;
1480               vnet_buffer (b[1])->ip.rx_sw_if_index = rd1->rd_sw_if_index;
1481             }
1482           else
1483             {
1484               vnet_buffer (b[0])->ip.rx_sw_if_index = ~0;
1485               vnet_buffer (b[1])->ip.rx_sw_if_index = ~0;
1486             }
1487         }                       /* head_of_feature_arc */
1488
1489       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1490       next[0] =
1491         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1492       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1493       next[1] =
1494         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1495
1496       b[0]->error = error_node->errors[error[0]];
1497       b[1]->error = error_node->errors[error[1]];
1498
1499       if (head_of_feature_arc)
1500         {
1501           u8 ip6_unknown[2];
1502           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1503           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1504           if (PREDICT_TRUE (ip6_unknown[0]))
1505             {
1506               u32 next32 = next[0];
1507               vnet_feature_arc_start (arc_index,
1508                                       vnet_buffer (b[0])->sw_if_index
1509                                       [VLIB_RX], &next32, b[0]);
1510               next[0] = next32;
1511             }
1512           if (PREDICT_TRUE (ip6_unknown[1]))
1513             {
1514               u32 next32 = next[1];
1515               vnet_feature_arc_start (arc_index,
1516                                       vnet_buffer (b[1])->sw_if_index
1517                                       [VLIB_RX], &next32, b[1]);
1518               next[1] = next32;
1519             }
1520         }
1521
1522       /* next */
1523       b += 2;
1524       next += 2;
1525       n_left_from -= 2;
1526     }
1527
1528   while (n_left_from)
1529     {
1530       u8 error;
1531       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1532
1533       ip6_header_t *ip;
1534       ip = vlib_buffer_get_current (b[0]);
1535
1536       if (head_of_feature_arc)
1537         {
1538           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1539           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1540
1541           u32 flags = b[0]->flags;
1542
1543           vnet_buffer_oflags_t oflags = vnet_buffer (b[0])->oflags;
1544
1545           u32 l4_offload = (flags & VNET_BUFFER_F_OFFLOAD) &&
1546                            (oflags & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1547                                       VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1548
1549           u32 good_l4_csum =
1550             (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload;
1551           u32 udp_offset;
1552           i16 len_diff = 0;
1553           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1554           if (PREDICT_TRUE (is_tcp_udp))
1555             {
1556               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1557               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1558               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1559                 && udp->checksum == 0;
1560               /* optimistically verify UDP length. */
1561               u16 ip_len, udp_len;
1562               ip_len = clib_net_to_host_u16 (ip->payload_length);
1563               udp_len = clib_net_to_host_u16 (udp->length);
1564               len_diff = ip_len - udp_len;
1565             }
1566
1567           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1568           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1569
1570           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN &&
1571                          !good_l4_csum &&
1572                          !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1573           if (PREDICT_FALSE (need_csum))
1574             {
1575               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1576               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1577               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1578             }
1579           else
1580             {
1581               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1582                 error = IP6_ERROR_BAD_LENGTH;
1583             }
1584
1585
1586
1587           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1588           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1589                          IP6_ERROR_UDP_CHECKSUM,
1590                          "Wrong IP6 errors constants");
1591           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1592                          IP6_ERROR_ICMP_CHECKSUM,
1593                          "Wrong IP6 errors constants");
1594
1595           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1596
1597           /* Drop packets from unroutable hosts. */
1598           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1599           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1600             && type != IP_BUILTIN_PROTOCOL_ICMP
1601             && !ip6_address_is_link_local_unicast (&ip->src_address);
1602           if (PREDICT_FALSE (unroutable))
1603             {
1604               error =
1605                 !ip6_urpf_loose_check (im, b[0],
1606                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1607                 error;
1608             }
1609
1610           vnet_buffer (b[0])->ip.fib_index =
1611             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1612             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1613             vnet_buffer (b[0])->ip.fib_index;
1614           if (is_receive_dpo)
1615             {
1616               receive_dpo_t *rd;
1617               rd = receive_dpo_get (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
1618               vnet_buffer (b[0])->ip.rx_sw_if_index = rd->rd_sw_if_index;
1619             }
1620           else
1621             vnet_buffer (b[0])->ip.rx_sw_if_index = ~0;
1622         }                       /* head_of_feature_arc */
1623
1624       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1625       next[0] =
1626         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1627
1628       b[0]->error = error_node->errors[error];
1629
1630       if (head_of_feature_arc)
1631         {
1632           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1633             {
1634               u32 next32 = next[0];
1635               vnet_feature_arc_start (arc_index,
1636                                       vnet_buffer (b[0])->sw_if_index
1637                                       [VLIB_RX], &next32, b[0]);
1638               next[0] = next32;
1639             }
1640         }
1641
1642       /* next */
1643       b += 1;
1644       next += 1;
1645       n_left_from -= 1;
1646     }
1647
1648   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1649   return frame->n_vectors;
1650 }
1651
1652 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1653                                vlib_frame_t * frame)
1654 {
1655   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */,
1656                            0 /* ip6_local_inline */);
1657 }
1658
1659 VLIB_REGISTER_NODE (ip6_local_node) =
1660 {
1661   .name = "ip6-local",
1662   .vector_size = sizeof (u32),
1663   .format_trace = format_ip6_forward_next_trace,
1664   .n_next_nodes = IP_LOCAL_N_NEXT,
1665   .next_nodes =
1666   {
1667     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1668     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1669     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1670     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1671     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly",
1672   },
1673 };
1674
1675 VLIB_NODE_FN (ip6_receive_local_node)
1676 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1677 {
1678   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */,
1679                            1 /* is_receive_dpo */);
1680 }
1681
1682 VLIB_REGISTER_NODE (ip6_receive_local_node) = {
1683   .name = "ip6-receive",
1684   .vector_size = sizeof (u32),
1685   .format_trace = format_ip6_forward_next_trace,
1686   .sibling_of = "ip6-local"
1687 };
1688
1689 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1690                                           vlib_node_runtime_t * node,
1691                                           vlib_frame_t * frame)
1692 {
1693   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */,
1694                            0 /* ip6_local_inline */);
1695 }
1696
1697 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1698   .name = "ip6-local-end-of-arc",
1699   .vector_size = sizeof (u32),
1700
1701   .format_trace = format_ip6_forward_next_trace,
1702   .sibling_of = "ip6-local",
1703 };
1704
1705 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1706   .arc_name = "ip6-local",
1707   .node_name = "ip6-local-end-of-arc",
1708   .runs_before = 0, /* not before any other features */
1709 };
1710
1711 #ifdef CLIB_MARCH_VARIANT
1712 extern vlib_node_registration_t ip6_local_node;
1713 #else
1714 void
1715 ip6_register_protocol (u32 protocol, u32 node_index)
1716 {
1717   vlib_main_t *vm = vlib_get_main ();
1718   ip6_main_t *im = &ip6_main;
1719   ip_lookup_main_t *lm = &im->lookup_main;
1720
1721   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1722   lm->local_next_by_ip_protocol[protocol] =
1723     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1724 }
1725
1726 void
1727 ip6_unregister_protocol (u32 protocol)
1728 {
1729   ip6_main_t *im = &ip6_main;
1730   ip_lookup_main_t *lm = &im->lookup_main;
1731
1732   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1733   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1734 }
1735 #endif
1736
1737 typedef enum
1738 {
1739   IP6_REWRITE_NEXT_DROP,
1740   IP6_REWRITE_NEXT_ICMP_ERROR,
1741   IP6_REWRITE_NEXT_FRAGMENT,
1742   IP6_REWRITE_N_NEXT            /* Last */
1743 } ip6_rewrite_next_t;
1744
1745 /**
1746  * This bits of an IPv6 address to mask to construct a multicast
1747  * MAC address
1748  */
1749 #define IP6_MCAST_ADDR_MASK 0xffffffff
1750
1751 always_inline void
1752 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1753                u16 adj_packet_bytes, bool is_locally_generated,
1754                u32 * next, u8 is_midchain, u32 * error)
1755 {
1756   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1757     {
1758       if (is_locally_generated)
1759         {
1760           /* IP fragmentation */
1761           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1762                                    (is_midchain ?
1763                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1764                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1765           *next = IP6_REWRITE_NEXT_FRAGMENT;
1766           *error = IP6_ERROR_MTU_EXCEEDED;
1767         }
1768       else
1769         {
1770           *error = IP6_ERROR_MTU_EXCEEDED;
1771           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1772                                        adj_packet_bytes);
1773           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1774         }
1775     }
1776 }
1777
1778 always_inline uword
1779 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1780                              vlib_node_runtime_t * node,
1781                              vlib_frame_t * frame,
1782                              int do_counters, int is_midchain, int is_mcast)
1783 {
1784   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1785   u32 *from = vlib_frame_vector_args (frame);
1786   u32 n_left_from, n_left_to_next, *to_next, next_index;
1787   vlib_node_runtime_t *error_node =
1788     vlib_node_get_runtime (vm, ip6_input_node.index);
1789
1790   n_left_from = frame->n_vectors;
1791   next_index = node->cached_next_index;
1792   u32 thread_index = vm->thread_index;
1793
1794   while (n_left_from > 0)
1795     {
1796       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1797
1798       while (n_left_from >= 4 && n_left_to_next >= 2)
1799         {
1800           const ip_adjacency_t *adj0, *adj1;
1801           vlib_buffer_t *p0, *p1;
1802           ip6_header_t *ip0, *ip1;
1803           u32 pi0, rw_len0, next0, error0, adj_index0;
1804           u32 pi1, rw_len1, next1, error1, adj_index1;
1805           u32 tx_sw_if_index0, tx_sw_if_index1;
1806           bool is_locally_originated0, is_locally_originated1;
1807
1808           /* Prefetch next iteration. */
1809           {
1810             vlib_buffer_t *p2, *p3;
1811
1812             p2 = vlib_get_buffer (vm, from[2]);
1813             p3 = vlib_get_buffer (vm, from[3]);
1814
1815             vlib_prefetch_buffer_header (p2, LOAD);
1816             vlib_prefetch_buffer_header (p3, LOAD);
1817
1818             clib_prefetch_store (p2->pre_data);
1819             clib_prefetch_store (p3->pre_data);
1820
1821             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1822             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1823           }
1824
1825           pi0 = to_next[0] = from[0];
1826           pi1 = to_next[1] = from[1];
1827
1828           from += 2;
1829           n_left_from -= 2;
1830           to_next += 2;
1831           n_left_to_next -= 2;
1832
1833           p0 = vlib_get_buffer (vm, pi0);
1834           p1 = vlib_get_buffer (vm, pi1);
1835
1836           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1837           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1838
1839           ip0 = vlib_buffer_get_current (p0);
1840           ip1 = vlib_buffer_get_current (p1);
1841
1842           error0 = error1 = IP6_ERROR_NONE;
1843           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1844
1845           is_locally_originated0 =
1846             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1847           if (PREDICT_TRUE (!is_locally_originated0))
1848             {
1849               i32 hop_limit0 = ip0->hop_limit;
1850
1851               /* Input node should have reject packets with hop limit 0. */
1852               ASSERT (ip0->hop_limit > 0);
1853
1854               hop_limit0 -= 1;
1855
1856               ip0->hop_limit = hop_limit0;
1857
1858               /*
1859                * If the hop count drops below 1 when forwarding, generate
1860                * an ICMP response.
1861                */
1862               if (PREDICT_FALSE (hop_limit0 <= 0))
1863                 {
1864                   error0 = IP6_ERROR_TIME_EXPIRED;
1865                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1866                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1867                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1868                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1869                                                0);
1870                 }
1871             }
1872
1873           is_locally_originated1 =
1874             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1875           if (PREDICT_TRUE (!is_locally_originated1))
1876             {
1877               i32 hop_limit1 = ip1->hop_limit;
1878
1879               /* Input node should have reject packets with hop limit 0. */
1880               ASSERT (ip1->hop_limit > 0);
1881
1882               hop_limit1 -= 1;
1883
1884               ip1->hop_limit = hop_limit1;
1885
1886               /*
1887                * If the hop count drops below 1 when forwarding, generate
1888                * an ICMP response.
1889                */
1890               if (PREDICT_FALSE (hop_limit1 <= 0))
1891                 {
1892                   error1 = IP6_ERROR_TIME_EXPIRED;
1893                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1894                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1895                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1896                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1897                                                0);
1898                 }
1899             }
1900
1901           adj0 = adj_get (adj_index0);
1902           adj1 = adj_get (adj_index1);
1903
1904           rw_len0 = adj0[0].rewrite_header.data_bytes;
1905           rw_len1 = adj1[0].rewrite_header.data_bytes;
1906           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1907           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1908
1909           if (do_counters)
1910             {
1911               vlib_increment_combined_counter
1912                 (&adjacency_counters,
1913                  thread_index, adj_index0, 1,
1914                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1915               vlib_increment_combined_counter
1916                 (&adjacency_counters,
1917                  thread_index, adj_index1, 1,
1918                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1919             }
1920
1921           /* Check MTU of outgoing interface. */
1922           u16 ip0_len =
1923             clib_net_to_host_u16 (ip0->payload_length) +
1924             sizeof (ip6_header_t);
1925           u16 ip1_len =
1926             clib_net_to_host_u16 (ip1->payload_length) +
1927             sizeof (ip6_header_t);
1928           if (p0->flags & VNET_BUFFER_F_GSO)
1929             ip0_len = gso_mtu_sz (p0);
1930           if (p1->flags & VNET_BUFFER_F_GSO)
1931             ip1_len = gso_mtu_sz (p1);
1932
1933           ip6_mtu_check (p0, ip0_len,
1934                          adj0[0].rewrite_header.max_l3_packet_bytes,
1935                          is_locally_originated0, &next0, is_midchain,
1936                          &error0);
1937           ip6_mtu_check (p1, ip1_len,
1938                          adj1[0].rewrite_header.max_l3_packet_bytes,
1939                          is_locally_originated1, &next1, is_midchain,
1940                          &error1);
1941           /* Don't adjust the buffer for hop count issue; icmp-error node
1942            * wants to see the IP header */
1943           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1944             {
1945               p0->current_data -= rw_len0;
1946               p0->current_length += rw_len0;
1947               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1948               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1949               next0 = adj0[0].rewrite_header.next_index;
1950               if (PREDICT_FALSE
1951                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1952                 vnet_feature_arc_start_w_cfg_index
1953                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
1954                    adj0->ia_cfg_index);
1955             }
1956           else
1957             {
1958               p0->error = error_node->errors[error0];
1959             }
1960           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1961             {
1962               p1->current_data -= rw_len1;
1963               p1->current_length += rw_len1;
1964
1965               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1966               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1967               next1 = adj1[0].rewrite_header.next_index;
1968
1969               if (PREDICT_FALSE
1970                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1971                 vnet_feature_arc_start_w_cfg_index
1972                   (lm->output_feature_arc_index, tx_sw_if_index1, &next1, p1,
1973                    adj1->ia_cfg_index);
1974             }
1975           else
1976             {
1977               p1->error = error_node->errors[error1];
1978             }
1979
1980           if (is_midchain)
1981             {
1982               /* before we paint on the next header, update the L4
1983                * checksums if required, since there's no offload on a tunnel */
1984               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
1985                                           1 /* is_ip6 */ );
1986               vnet_calc_checksums_inline (vm, p1, 0 /* is_ip4 */ ,
1987                                           1 /* is_ip6 */ );
1988
1989               /* Guess we are only writing on ipv6 header. */
1990               vnet_rewrite_two_headers (adj0[0], adj1[0],
1991                                         ip0, ip1, sizeof (ip6_header_t));
1992             }
1993           else
1994             /* Guess we are only writing on simple Ethernet header. */
1995             vnet_rewrite_two_headers (adj0[0], adj1[0],
1996                                       ip0, ip1, sizeof (ethernet_header_t));
1997
1998           if (is_midchain)
1999             {
2000               if (adj0->sub_type.midchain.fixup_func)
2001                 adj0->sub_type.midchain.fixup_func
2002                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2003               if (adj1->sub_type.midchain.fixup_func)
2004                 adj1->sub_type.midchain.fixup_func
2005                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
2006             }
2007           if (is_mcast)
2008             {
2009               /*
2010                * copy bytes from the IP address into the MAC rewrite
2011                */
2012               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2013                                           adj0->
2014                                           rewrite_header.dst_mcast_offset,
2015                                           &ip0->dst_address.as_u32[3],
2016                                           (u8 *) ip0);
2017               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2018                                           adj1->
2019                                           rewrite_header.dst_mcast_offset,
2020                                           &ip1->dst_address.as_u32[3],
2021                                           (u8 *) ip1);
2022             }
2023
2024           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2025                                            to_next, n_left_to_next,
2026                                            pi0, pi1, next0, next1);
2027         }
2028
2029       while (n_left_from > 0 && n_left_to_next > 0)
2030         {
2031           ip_adjacency_t *adj0;
2032           vlib_buffer_t *p0;
2033           ip6_header_t *ip0;
2034           u32 pi0, rw_len0;
2035           u32 adj_index0, next0, error0;
2036           u32 tx_sw_if_index0;
2037           bool is_locally_originated0;
2038
2039           pi0 = to_next[0] = from[0];
2040
2041           p0 = vlib_get_buffer (vm, pi0);
2042
2043           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2044
2045           adj0 = adj_get (adj_index0);
2046
2047           ip0 = vlib_buffer_get_current (p0);
2048
2049           error0 = IP6_ERROR_NONE;
2050           next0 = IP6_REWRITE_NEXT_DROP;
2051
2052           /* Check hop limit */
2053           is_locally_originated0 =
2054             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
2055           if (PREDICT_TRUE (!is_locally_originated0))
2056             {
2057               i32 hop_limit0 = ip0->hop_limit;
2058
2059               ASSERT (ip0->hop_limit > 0);
2060
2061               hop_limit0 -= 1;
2062
2063               ip0->hop_limit = hop_limit0;
2064
2065               if (PREDICT_FALSE (hop_limit0 <= 0))
2066                 {
2067                   /*
2068                    * If the hop count drops below 1 when forwarding, generate
2069                    * an ICMP response.
2070                    */
2071                   error0 = IP6_ERROR_TIME_EXPIRED;
2072                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
2073                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2074                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
2075                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
2076                                                0);
2077                 }
2078             }
2079
2080           if (is_midchain)
2081             {
2082               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
2083                                           1 /* is_ip6 */ );
2084
2085               /* Guess we are only writing on ip6 header. */
2086               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip6_header_t));
2087             }
2088           else
2089             /* Guess we are only writing on simple Ethernet header. */
2090             vnet_rewrite_one_header (adj0[0], ip0,
2091                                      sizeof (ethernet_header_t));
2092
2093           /* Update packet buffer attributes/set output interface. */
2094           rw_len0 = adj0[0].rewrite_header.data_bytes;
2095           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2096
2097           if (do_counters)
2098             {
2099               vlib_increment_combined_counter
2100                 (&adjacency_counters,
2101                  thread_index, adj_index0, 1,
2102                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2103             }
2104
2105           /* Check MTU of outgoing interface. */
2106           u16 ip0_len =
2107             clib_net_to_host_u16 (ip0->payload_length) +
2108             sizeof (ip6_header_t);
2109           if (p0->flags & VNET_BUFFER_F_GSO)
2110             ip0_len = gso_mtu_sz (p0);
2111
2112           ip6_mtu_check (p0, ip0_len,
2113                          adj0[0].rewrite_header.max_l3_packet_bytes,
2114                          is_locally_originated0, &next0, is_midchain,
2115                          &error0);
2116           /* Don't adjust the buffer for hop count issue; icmp-error node
2117            * wants to see the IP header */
2118           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2119             {
2120               p0->current_data -= rw_len0;
2121               p0->current_length += rw_len0;
2122
2123               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2124
2125               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2126               next0 = adj0[0].rewrite_header.next_index;
2127
2128               if (PREDICT_FALSE
2129                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2130                 vnet_feature_arc_start_w_cfg_index
2131                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
2132                    adj0->ia_cfg_index);
2133             }
2134           else
2135             {
2136               p0->error = error_node->errors[error0];
2137             }
2138
2139           if (is_midchain)
2140             {
2141               if (adj0->sub_type.midchain.fixup_func)
2142                 adj0->sub_type.midchain.fixup_func
2143                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2144             }
2145           if (is_mcast)
2146             {
2147               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2148                                           adj0->
2149                                           rewrite_header.dst_mcast_offset,
2150                                           &ip0->dst_address.as_u32[3],
2151                                           (u8 *) ip0);
2152             }
2153
2154           from += 1;
2155           n_left_from -= 1;
2156           to_next += 1;
2157           n_left_to_next -= 1;
2158
2159           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2160                                            to_next, n_left_to_next,
2161                                            pi0, next0);
2162         }
2163
2164       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2165     }
2166
2167   /* Need to do trace after rewrites to pick up new packet data. */
2168   if (node->flags & VLIB_NODE_FLAG_TRACE)
2169     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2170
2171   return frame->n_vectors;
2172 }
2173
2174 always_inline uword
2175 ip6_rewrite_inline (vlib_main_t * vm,
2176                     vlib_node_runtime_t * node,
2177                     vlib_frame_t * frame,
2178                     int do_counters, int is_midchain, int is_mcast)
2179 {
2180   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2181                                       is_midchain, is_mcast);
2182 }
2183
2184 VLIB_NODE_FN (ip6_rewrite_node) (vlib_main_t * vm,
2185                                  vlib_node_runtime_t * node,
2186                                  vlib_frame_t * frame)
2187 {
2188   if (adj_are_counters_enabled ())
2189     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2190   else
2191     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2192 }
2193
2194 VLIB_NODE_FN (ip6_rewrite_bcast_node) (vlib_main_t * vm,
2195                                        vlib_node_runtime_t * node,
2196                                        vlib_frame_t * frame)
2197 {
2198   if (adj_are_counters_enabled ())
2199     return ip6_rewrite_inline (vm, node, frame, 1, 0, 0);
2200   else
2201     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2202 }
2203
2204 VLIB_NODE_FN (ip6_rewrite_mcast_node) (vlib_main_t * vm,
2205                                        vlib_node_runtime_t * node,
2206                                        vlib_frame_t * frame)
2207 {
2208   if (adj_are_counters_enabled ())
2209     return ip6_rewrite_inline (vm, node, frame, 1, 0, 1);
2210   else
2211     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2212 }
2213
2214 VLIB_NODE_FN (ip6_midchain_node) (vlib_main_t * vm,
2215                                   vlib_node_runtime_t * node,
2216                                   vlib_frame_t * frame)
2217 {
2218   if (adj_are_counters_enabled ())
2219     return ip6_rewrite_inline (vm, node, frame, 1, 1, 0);
2220   else
2221     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2222 }
2223
2224 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2225                                         vlib_node_runtime_t * node,
2226                                         vlib_frame_t * frame)
2227 {
2228   if (adj_are_counters_enabled ())
2229     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2230   else
2231     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2232 }
2233
2234 /* *INDENT-OFF* */
2235 VLIB_REGISTER_NODE (ip6_midchain_node) =
2236 {
2237   .name = "ip6-midchain",
2238   .vector_size = sizeof (u32),
2239   .format_trace = format_ip6_forward_next_trace,
2240   .sibling_of = "ip6-rewrite",
2241   };
2242
2243 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2244 {
2245   .name = "ip6-rewrite",
2246   .vector_size = sizeof (u32),
2247   .format_trace = format_ip6_rewrite_trace,
2248   .n_next_nodes = IP6_REWRITE_N_NEXT,
2249   .next_nodes =
2250   {
2251     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2252     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2253     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2254   },
2255 };
2256
2257 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2258   .name = "ip6-rewrite-bcast",
2259   .vector_size = sizeof (u32),
2260
2261   .format_trace = format_ip6_rewrite_trace,
2262   .sibling_of = "ip6-rewrite",
2263 };
2264
2265 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2266 {
2267   .name = "ip6-rewrite-mcast",
2268   .vector_size = sizeof (u32),
2269   .format_trace = format_ip6_rewrite_trace,
2270   .sibling_of = "ip6-rewrite",
2271 };
2272
2273
2274 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2275 {
2276   .name = "ip6-mcast-midchain",
2277   .vector_size = sizeof (u32),
2278   .format_trace = format_ip6_rewrite_trace,
2279   .sibling_of = "ip6-rewrite",
2280 };
2281
2282 /* *INDENT-ON* */
2283
2284 /*
2285  * Hop-by-Hop handling
2286  */
2287 #ifndef CLIB_MARCH_VARIANT
2288 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2289 #endif /* CLIB_MARCH_VARIANT */
2290
2291 #define foreach_ip6_hop_by_hop_error \
2292 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2293 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2294 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2295
2296 /* *INDENT-OFF* */
2297 typedef enum
2298 {
2299 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2300   foreach_ip6_hop_by_hop_error
2301 #undef _
2302   IP6_HOP_BY_HOP_N_ERROR,
2303 } ip6_hop_by_hop_error_t;
2304 /* *INDENT-ON* */
2305
2306 /*
2307  * Primary h-b-h handler trace support
2308  * We work pretty hard on the problem for obvious reasons
2309  */
2310 typedef struct
2311 {
2312   u32 next_index;
2313   u32 trace_len;
2314   u8 option_data[256];
2315 } ip6_hop_by_hop_trace_t;
2316
2317 extern vlib_node_registration_t ip6_hop_by_hop_node;
2318
2319 static char *ip6_hop_by_hop_error_strings[] = {
2320 #define _(sym,string) string,
2321   foreach_ip6_hop_by_hop_error
2322 #undef _
2323 };
2324
2325 #ifndef CLIB_MARCH_VARIANT
2326 u8 *
2327 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2328 {
2329   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2330   int total_len = va_arg (*args, int);
2331   ip6_hop_by_hop_option_t *opt0, *limit0;
2332   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2333   u8 type0;
2334   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2335               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2336
2337   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2338   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2339
2340   while (opt0 < limit0)
2341     {
2342       type0 = opt0->type;
2343       switch (type0)
2344         {
2345         case 0:         /* Pad, just stop */
2346           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2347           break;
2348
2349         default:
2350           if (hm->trace[type0])
2351             {
2352               s = (*hm->trace[type0]) (s, opt0);
2353             }
2354           else
2355             {
2356               s = format (s, "\n    unrecognized option %d length %d", type0,
2357                           opt0->length);
2358             }
2359           opt0 =
2360             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2361                                          sizeof (ip6_hop_by_hop_option_t));
2362           break;
2363         }
2364     }
2365   return s;
2366 }
2367 #endif
2368
2369 static u8 *
2370 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2371 {
2372   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2373   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2374   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2375   ip6_hop_by_hop_header_t *hbh0;
2376   ip6_hop_by_hop_option_t *opt0, *limit0;
2377   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2378
2379   u8 type0;
2380
2381   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2382
2383   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2384               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2385
2386   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2387   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2388
2389   while (opt0 < limit0)
2390     {
2391       type0 = opt0->type;
2392       switch (type0)
2393         {
2394         case 0:         /* Pad, just stop */
2395           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2396           break;
2397
2398         default:
2399           if (hm->trace[type0])
2400             {
2401               s = (*hm->trace[type0]) (s, opt0);
2402             }
2403           else
2404             {
2405               s = format (s, "\n    unrecognized option %d length %d", type0,
2406                           opt0->length);
2407             }
2408           opt0 =
2409             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2410                                          sizeof (ip6_hop_by_hop_option_t));
2411           break;
2412         }
2413     }
2414   return s;
2415 }
2416
2417 always_inline u8
2418 ip6_scan_hbh_options (vlib_buffer_t * b0,
2419                       ip6_header_t * ip0,
2420                       ip6_hop_by_hop_header_t * hbh0,
2421                       ip6_hop_by_hop_option_t * opt0,
2422                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2423 {
2424   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2425   u8 type0;
2426   u8 error0 = 0;
2427
2428   while (opt0 < limit0)
2429     {
2430       type0 = opt0->type;
2431       switch (type0)
2432         {
2433         case 0:         /* Pad1 */
2434           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2435           continue;
2436         case 1:         /* PadN */
2437           break;
2438         default:
2439           if (hm->options[type0])
2440             {
2441               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2442                 {
2443                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2444                   return (error0);
2445                 }
2446             }
2447           else
2448             {
2449               /* Unrecognized mandatory option, check the two high order bits */
2450               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2451                 {
2452                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2453                   break;
2454                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2455                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2456                   *next0 = IP_LOOKUP_NEXT_DROP;
2457                   break;
2458                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2459                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2460                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2461                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2462                                                ICMP6_parameter_problem_unrecognized_option,
2463                                                (u8 *) opt0 - (u8 *) ip0);
2464                   break;
2465                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2466                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2467                   if (!ip6_address_is_multicast (&ip0->dst_address))
2468                     {
2469                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2470                       icmp6_error_set_vnet_buffer (b0,
2471                                                    ICMP6_parameter_problem,
2472                                                    ICMP6_parameter_problem_unrecognized_option,
2473                                                    (u8 *) opt0 - (u8 *) ip0);
2474                     }
2475                   else
2476                     {
2477                       *next0 = IP_LOOKUP_NEXT_DROP;
2478                     }
2479                   break;
2480                 }
2481               return (error0);
2482             }
2483         }
2484       opt0 =
2485         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2486                                      sizeof (ip6_hop_by_hop_option_t));
2487     }
2488   return (error0);
2489 }
2490
2491 /*
2492  * Process the Hop-by-Hop Options header
2493  */
2494 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2495                                     vlib_node_runtime_t * node,
2496                                     vlib_frame_t * frame)
2497 {
2498   vlib_node_runtime_t *error_node =
2499     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2500   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2501   u32 n_left_from, *from, *to_next;
2502   ip_lookup_next_t next_index;
2503
2504   from = vlib_frame_vector_args (frame);
2505   n_left_from = frame->n_vectors;
2506   next_index = node->cached_next_index;
2507
2508   while (n_left_from > 0)
2509     {
2510       u32 n_left_to_next;
2511
2512       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2513
2514       while (n_left_from >= 4 && n_left_to_next >= 2)
2515         {
2516           u32 bi0, bi1;
2517           vlib_buffer_t *b0, *b1;
2518           u32 next0, next1;
2519           ip6_header_t *ip0, *ip1;
2520           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2521           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2522           u8 error0 = 0, error1 = 0;
2523
2524           /* Prefetch next iteration. */
2525           {
2526             vlib_buffer_t *p2, *p3;
2527
2528             p2 = vlib_get_buffer (vm, from[2]);
2529             p3 = vlib_get_buffer (vm, from[3]);
2530
2531             vlib_prefetch_buffer_header (p2, LOAD);
2532             vlib_prefetch_buffer_header (p3, LOAD);
2533
2534             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2535             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2536           }
2537
2538           /* Speculatively enqueue b0, b1 to the current next frame */
2539           to_next[0] = bi0 = from[0];
2540           to_next[1] = bi1 = from[1];
2541           from += 2;
2542           to_next += 2;
2543           n_left_from -= 2;
2544           n_left_to_next -= 2;
2545
2546           b0 = vlib_get_buffer (vm, bi0);
2547           b1 = vlib_get_buffer (vm, bi1);
2548
2549           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2550           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2551           ip_adjacency_t *adj0 = adj_get (adj_index0);
2552           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2553           ip_adjacency_t *adj1 = adj_get (adj_index1);
2554
2555           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2556           next0 = adj0->lookup_next_index;
2557           next1 = adj1->lookup_next_index;
2558
2559           ip0 = vlib_buffer_get_current (b0);
2560           ip1 = vlib_buffer_get_current (b1);
2561           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2562           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2563           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2564           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2565           limit0 =
2566             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2567                                          ((hbh0->length + 1) << 3));
2568           limit1 =
2569             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2570                                          ((hbh1->length + 1) << 3));
2571
2572           /*
2573            * Basic validity checks
2574            */
2575           if ((hbh0->length + 1) << 3 >
2576               clib_net_to_host_u16 (ip0->payload_length))
2577             {
2578               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2579               next0 = IP_LOOKUP_NEXT_DROP;
2580               goto outdual;
2581             }
2582           /* Scan the set of h-b-h options, process ones that we understand */
2583           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2584
2585           if ((hbh1->length + 1) << 3 >
2586               clib_net_to_host_u16 (ip1->payload_length))
2587             {
2588               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2589               next1 = IP_LOOKUP_NEXT_DROP;
2590               goto outdual;
2591             }
2592           /* Scan the set of h-b-h options, process ones that we understand */
2593           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2594
2595         outdual:
2596           /* Has the classifier flagged this buffer for special treatment? */
2597           if (PREDICT_FALSE
2598               ((error0 == 0)
2599                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2600             next0 = hm->next_override;
2601
2602           /* Has the classifier flagged this buffer for special treatment? */
2603           if (PREDICT_FALSE
2604               ((error1 == 0)
2605                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2606             next1 = hm->next_override;
2607
2608           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2609             {
2610               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2611                 {
2612                   ip6_hop_by_hop_trace_t *t =
2613                     vlib_add_trace (vm, node, b0, sizeof (*t));
2614                   u32 trace_len = (hbh0->length + 1) << 3;
2615                   t->next_index = next0;
2616                   /* Capture the h-b-h option verbatim */
2617                   trace_len =
2618                     trace_len <
2619                     ARRAY_LEN (t->option_data) ? trace_len :
2620                     ARRAY_LEN (t->option_data);
2621                   t->trace_len = trace_len;
2622                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2623                 }
2624               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2625                 {
2626                   ip6_hop_by_hop_trace_t *t =
2627                     vlib_add_trace (vm, node, b1, sizeof (*t));
2628                   u32 trace_len = (hbh1->length + 1) << 3;
2629                   t->next_index = next1;
2630                   /* Capture the h-b-h option verbatim */
2631                   trace_len =
2632                     trace_len <
2633                     ARRAY_LEN (t->option_data) ? trace_len :
2634                     ARRAY_LEN (t->option_data);
2635                   t->trace_len = trace_len;
2636                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2637                 }
2638
2639             }
2640
2641           b0->error = error_node->errors[error0];
2642           b1->error = error_node->errors[error1];
2643
2644           /* verify speculative enqueue, maybe switch current next frame */
2645           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2646                                            n_left_to_next, bi0, bi1, next0,
2647                                            next1);
2648         }
2649
2650       while (n_left_from > 0 && n_left_to_next > 0)
2651         {
2652           u32 bi0;
2653           vlib_buffer_t *b0;
2654           u32 next0;
2655           ip6_header_t *ip0;
2656           ip6_hop_by_hop_header_t *hbh0;
2657           ip6_hop_by_hop_option_t *opt0, *limit0;
2658           u8 error0 = 0;
2659
2660           /* Speculatively enqueue b0 to the current next frame */
2661           bi0 = from[0];
2662           to_next[0] = bi0;
2663           from += 1;
2664           to_next += 1;
2665           n_left_from -= 1;
2666           n_left_to_next -= 1;
2667
2668           b0 = vlib_get_buffer (vm, bi0);
2669           /*
2670            * Default use the next_index from the adjacency.
2671            * A HBH option rarely redirects to a different node
2672            */
2673           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2674           ip_adjacency_t *adj0 = adj_get (adj_index0);
2675           next0 = adj0->lookup_next_index;
2676
2677           ip0 = vlib_buffer_get_current (b0);
2678           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2679           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2680           limit0 =
2681             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2682                                          ((hbh0->length + 1) << 3));
2683
2684           /*
2685            * Basic validity checks
2686            */
2687           if ((hbh0->length + 1) << 3 >
2688               clib_net_to_host_u16 (ip0->payload_length))
2689             {
2690               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2691               next0 = IP_LOOKUP_NEXT_DROP;
2692               goto out0;
2693             }
2694
2695           /* Scan the set of h-b-h options, process ones that we understand */
2696           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2697
2698         out0:
2699           /* Has the classifier flagged this buffer for special treatment? */
2700           if (PREDICT_FALSE
2701               ((error0 == 0)
2702                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2703             next0 = hm->next_override;
2704
2705           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2706             {
2707               ip6_hop_by_hop_trace_t *t =
2708                 vlib_add_trace (vm, node, b0, sizeof (*t));
2709               u32 trace_len = (hbh0->length + 1) << 3;
2710               t->next_index = next0;
2711               /* Capture the h-b-h option verbatim */
2712               trace_len =
2713                 trace_len <
2714                 ARRAY_LEN (t->option_data) ? trace_len :
2715                 ARRAY_LEN (t->option_data);
2716               t->trace_len = trace_len;
2717               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2718             }
2719
2720           b0->error = error_node->errors[error0];
2721
2722           /* verify speculative enqueue, maybe switch current next frame */
2723           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2724                                            n_left_to_next, bi0, next0);
2725         }
2726       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2727     }
2728   return frame->n_vectors;
2729 }
2730
2731 /* *INDENT-OFF* */
2732 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2733 {
2734   .name = "ip6-hop-by-hop",
2735   .sibling_of = "ip6-lookup",
2736   .vector_size = sizeof (u32),
2737   .format_trace = format_ip6_hop_by_hop_trace,
2738   .type = VLIB_NODE_TYPE_INTERNAL,
2739   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2740   .error_strings = ip6_hop_by_hop_error_strings,
2741   .n_next_nodes = 0,
2742 };
2743 /* *INDENT-ON* */
2744
2745 static clib_error_t *
2746 ip6_hop_by_hop_init (vlib_main_t * vm)
2747 {
2748   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2749   clib_memset (hm->options, 0, sizeof (hm->options));
2750   clib_memset (hm->trace, 0, sizeof (hm->trace));
2751   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2752   return (0);
2753 }
2754
2755 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2756
2757 #ifndef CLIB_MARCH_VARIANT
2758 void
2759 ip6_hbh_set_next_override (uword next)
2760 {
2761   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2762
2763   hm->next_override = next;
2764 }
2765
2766 int
2767 ip6_hbh_register_option (u8 option,
2768                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2769                                       ip6_hop_by_hop_option_t * opt),
2770                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2771 {
2772   ip6_main_t *im = &ip6_main;
2773   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2774
2775   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2776
2777   /* Already registered */
2778   if (hm->options[option])
2779     return (-1);
2780
2781   hm->options[option] = options;
2782   hm->trace[option] = trace;
2783
2784   /* Set global variable */
2785   im->hbh_enabled = 1;
2786
2787   return (0);
2788 }
2789
2790 int
2791 ip6_hbh_unregister_option (u8 option)
2792 {
2793   ip6_main_t *im = &ip6_main;
2794   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2795
2796   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2797
2798   /* Not registered */
2799   if (!hm->options[option])
2800     return (-1);
2801
2802   hm->options[option] = NULL;
2803   hm->trace[option] = NULL;
2804
2805   /* Disable global knob if this was the last option configured */
2806   int i;
2807   bool found = false;
2808   for (i = 0; i < 256; i++)
2809     {
2810       if (hm->options[option])
2811         {
2812           found = true;
2813           break;
2814         }
2815     }
2816   if (!found)
2817     im->hbh_enabled = 0;
2818
2819   return (0);
2820 }
2821
2822 /* Global IP6 main. */
2823 ip6_main_t ip6_main;
2824 #endif
2825
2826 static clib_error_t *
2827 ip6_lookup_init (vlib_main_t * vm)
2828 {
2829   ip6_main_t *im = &ip6_main;
2830   clib_error_t *error;
2831   uword i;
2832
2833   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2834     return error;
2835
2836   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2837     {
2838       u32 j, i0, i1;
2839
2840       i0 = i / 32;
2841       i1 = i % 32;
2842
2843       for (j = 0; j < i0; j++)
2844         im->fib_masks[i].as_u32[j] = ~0;
2845
2846       if (i1)
2847         im->fib_masks[i].as_u32[i0] =
2848           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2849     }
2850
2851   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2852
2853   /* Create FIB with index 0 and table id of 0. */
2854   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2855                                      FIB_SOURCE_DEFAULT_ROUTE);
2856   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2857                                       MFIB_SOURCE_DEFAULT_ROUTE);
2858
2859   {
2860     pg_node_t *pn;
2861     pn = pg_get_node (ip6_lookup_node.index);
2862     pn->unformat_edit = unformat_pg_ip6_header;
2863   }
2864
2865   /* Unless explicitly configured, don't process HBH options */
2866   im->hbh_enabled = 0;
2867
2868   return error;
2869 }
2870
2871 VLIB_INIT_FUNCTION (ip6_lookup_init);
2872
2873 static clib_error_t *
2874 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2875                               unformat_input_t * input,
2876                               vlib_cli_command_t * cmd)
2877 {
2878   int matched = 0;
2879   u32 table_id = 0;
2880   u32 flow_hash_config = 0;
2881   int rv;
2882
2883   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2884     {
2885       if (unformat (input, "table %d", &table_id))
2886         matched = 1;
2887 #define _(a, b, v)                                                            \
2888   else if (unformat (input, #a))                                              \
2889   {                                                                           \
2890     flow_hash_config |= v;                                                    \
2891     matched = 1;                                                              \
2892   }
2893       foreach_flow_hash_bit
2894 #undef _
2895         else
2896         break;
2897     }
2898
2899   if (matched == 0)
2900     return clib_error_return (0, "unknown input `%U'",
2901                               format_unformat_error, input);
2902
2903   rv = ip_flow_hash_set (AF_IP6, table_id, flow_hash_config);
2904   switch (rv)
2905     {
2906     case 0:
2907       break;
2908
2909     case -1:
2910       return clib_error_return (0, "no such FIB table %d", table_id);
2911
2912     default:
2913       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2914       break;
2915     }
2916
2917   return 0;
2918 }
2919
2920 /*?
2921  * Configure the set of IPv6 fields used by the flow hash.
2922  *
2923  * @cliexpar
2924  * @parblock
2925  * Example of how to set the flow hash on a given table:
2926  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2927  *
2928  * Example of display the configured flow hash:
2929  * @cliexstart{show ip6 fib}
2930  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2931  * @::/0
2932  *   unicast-ip6-chain
2933  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2934  *     [0] [@0]: dpo-drop ip6
2935  * fe80::/10
2936  *   unicast-ip6-chain
2937  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2938  *     [0] [@2]: dpo-receive
2939  * ff02::1/128
2940  *   unicast-ip6-chain
2941  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2942  *     [0] [@2]: dpo-receive
2943  * ff02::2/128
2944  *   unicast-ip6-chain
2945  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2946  *     [0] [@2]: dpo-receive
2947  * ff02::16/128
2948  *   unicast-ip6-chain
2949  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2950  *     [0] [@2]: dpo-receive
2951  * ff02::1:ff00:0/104
2952  *   unicast-ip6-chain
2953  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2954  *     [0] [@2]: dpo-receive
2955  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2956  * @::/0
2957  *   unicast-ip6-chain
2958  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2959  *     [0] [@0]: dpo-drop ip6
2960  * @::a:1:1:0:4/126
2961  *   unicast-ip6-chain
2962  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2963  *     [0] [@4]: ipv6-glean: af_packet0
2964  * @::a:1:1:0:7/128
2965  *   unicast-ip6-chain
2966  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2967  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2968  * fe80::/10
2969  *   unicast-ip6-chain
2970  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2971  *     [0] [@2]: dpo-receive
2972  * fe80::fe:3eff:fe3e:9222/128
2973  *   unicast-ip6-chain
2974  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2975  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2976  * ff02::1/128
2977  *   unicast-ip6-chain
2978  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2979  *     [0] [@2]: dpo-receive
2980  * ff02::2/128
2981  *   unicast-ip6-chain
2982  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2983  *     [0] [@2]: dpo-receive
2984  * ff02::16/128
2985  *   unicast-ip6-chain
2986  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2987  *     [0] [@2]: dpo-receive
2988  * ff02::1:ff00:0/104
2989  *   unicast-ip6-chain
2990  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2991  *     [0] [@2]: dpo-receive
2992  * @cliexend
2993  * @endparblock
2994 ?*/
2995 /* *INDENT-OFF* */
2996 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
2997   .path = "set ip6 flow-hash",
2998   .short_help = "set ip6 flow-hash table <table-id> [src] [dst] [sport] "
2999                 "[dport] [proto] [reverse] [flowlabel]",
3000   .function = set_ip6_flow_hash_command_fn,
3001 };
3002 /* *INDENT-ON* */
3003
3004 static clib_error_t *
3005 show_ip6_local_command_fn (vlib_main_t * vm,
3006                            unformat_input_t * input, vlib_cli_command_t * cmd)
3007 {
3008   ip6_main_t *im = &ip6_main;
3009   ip_lookup_main_t *lm = &im->lookup_main;
3010   int i;
3011
3012   vlib_cli_output (vm, "Protocols handled by ip6_local");
3013   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
3014     {
3015       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3016         {
3017
3018           u32 node_index = vlib_get_node (vm,
3019                                           ip6_local_node.index)->
3020             next_nodes[lm->local_next_by_ip_protocol[i]];
3021           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
3022                            node_index);
3023         }
3024     }
3025   return 0;
3026 }
3027
3028
3029
3030 /*?
3031  * Display the set of protocols handled by the local IPv6 stack.
3032  *
3033  * @cliexpar
3034  * Example of how to display local protocol table:
3035  * @cliexstart{show ip6 local}
3036  * Protocols handled by ip6_local
3037  * 17
3038  * 43
3039  * 58
3040  * 115
3041  * @cliexend
3042 ?*/
3043 /* *INDENT-OFF* */
3044 VLIB_CLI_COMMAND (show_ip6_local, static) =
3045 {
3046   .path = "show ip6 local",
3047   .function = show_ip6_local_command_fn,
3048   .short_help = "show ip6 local",
3049 };
3050 /* *INDENT-ON* */
3051
3052 #ifndef CLIB_MARCH_VARIANT
3053 int
3054 vnet_set_ip6_classify_intfc (vlib_main_t *vm, u32 sw_if_index, u32 table_index)
3055 {
3056   vnet_main_t *vnm = vnet_get_main ();
3057   vnet_interface_main_t *im = &vnm->interface_main;
3058   ip6_main_t *ipm = &ip6_main;
3059   ip_lookup_main_t *lm = &ipm->lookup_main;
3060   vnet_classify_main_t *cm = &vnet_classify_main;
3061   ip6_address_t *if_addr;
3062
3063   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3064     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3065
3066   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3067     return VNET_API_ERROR_NO_SUCH_ENTRY;
3068
3069   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3070   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3071
3072   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3073
3074   if (NULL != if_addr)
3075     {
3076       fib_prefix_t pfx = {
3077         .fp_len = 128,
3078         .fp_proto = FIB_PROTOCOL_IP6,
3079         .fp_addr.ip6 = *if_addr,
3080       };
3081       u32 fib_index;
3082
3083       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3084                                                        sw_if_index);
3085       if (table_index != (u32) ~ 0)
3086         {
3087           dpo_id_t dpo = DPO_INVALID;
3088           dpo_set (&dpo,
3089                    DPO_CLASSIFY,
3090                    DPO_PROTO_IP6,
3091                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3092           fib_table_entry_special_dpo_add (fib_index,
3093                                            &pfx,
3094                                            FIB_SOURCE_CLASSIFY,
3095                                            FIB_ENTRY_FLAG_NONE, &dpo);
3096           dpo_reset (&dpo);
3097         }
3098       else
3099         {
3100           fib_table_entry_special_remove (fib_index,
3101                                           &pfx, FIB_SOURCE_CLASSIFY);
3102         }
3103     }
3104
3105   return 0;
3106 }
3107 #endif
3108
3109 static clib_error_t *
3110 set_ip6_classify_command_fn (vlib_main_t * vm,
3111                              unformat_input_t * input,
3112                              vlib_cli_command_t * cmd)
3113 {
3114   u32 table_index = ~0;
3115   int table_index_set = 0;
3116   u32 sw_if_index = ~0;
3117   int rv;
3118
3119   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3120     {
3121       if (unformat (input, "table-index %d", &table_index))
3122         table_index_set = 1;
3123       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3124                          vnet_get_main (), &sw_if_index))
3125         ;
3126       else
3127         break;
3128     }
3129
3130   if (table_index_set == 0)
3131     return clib_error_return (0, "classify table-index must be specified");
3132
3133   if (sw_if_index == ~0)
3134     return clib_error_return (0, "interface / subif must be specified");
3135
3136   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3137
3138   switch (rv)
3139     {
3140     case 0:
3141       break;
3142
3143     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3144       return clib_error_return (0, "No such interface");
3145
3146     case VNET_API_ERROR_NO_SUCH_ENTRY:
3147       return clib_error_return (0, "No such classifier table");
3148     }
3149   return 0;
3150 }
3151
3152 /*?
3153  * Assign a classification table to an interface. The classification
3154  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3155  * commands. Once the table is create, use this command to filter packets
3156  * on an interface.
3157  *
3158  * @cliexpar
3159  * Example of how to assign a classification table to an interface:
3160  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3161 ?*/
3162 /* *INDENT-OFF* */
3163 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3164 {
3165   .path = "set ip6 classify",
3166   .short_help =
3167   "set ip6 classify intfc <interface> table-index <classify-idx>",
3168   .function = set_ip6_classify_command_fn,
3169 };
3170 /* *INDENT-ON* */
3171
3172 /*
3173  * fd.io coding-style-patch-verification: ON
3174  *
3175  * Local Variables:
3176  * eval: (c-set-style "gnu")
3177  * End:
3178  */