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       if (0 != im6->fib_index_by_sw_if_index[sw_if_index])
 722         fib_table_bind (FIB_PROTOCOL_IP6, sw_if_index, 0);
 723       if (0 != im6->mfib_index_by_sw_if_index[sw_if_index])
 724         mfib_table_bind (FIB_PROTOCOL_IP6, sw_if_index, 0);
 725
 726       /* Erase the lookup tables just in case */
 727       im6->fib_index_by_sw_if_index[sw_if_index] = ~0;
 728       im6->mfib_index_by_sw_if_index[sw_if_index] = ~0;
 729     }
 730
 731   vnet_feature_enable_disable ("ip6-unicast", "ip6-not-enabled", sw_if_index,
 732                                is_add, 0, 0);
 733
 734   vnet_feature_enable_disable ("ip6-multicast", "ip6-not-enabled",
 735                                sw_if_index, is_add, 0, 0);
 736
 737   return /* no error */ 0;
 738 }
 739
 740 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 741
 742 VLIB_NODE_FN (ip6_lookup_node) (vlib_main_t * vm,
 743                                 vlib_node_runtime_t * node,
 744                                 vlib_frame_t * frame)
 745 {
 746   return ip6_lookup_inline (vm, node, frame);
 747 }
 748
 749 static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
 750
 751 /* *INDENT-OFF* */
 752 VLIB_REGISTER_NODE (ip6_lookup_node) =
 753 {
 754   .name = "ip6-lookup",
 755   .vector_size = sizeof (u32),
 756   .format_trace = format_ip6_lookup_trace,
 757   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 758   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 759 };
 760 /* *INDENT-ON* */
 761
 762 VLIB_NODE_FN (ip6_load_balance_node) (vlib_main_t * vm,
 763                                       vlib_node_runtime_t * node,
 764                                       vlib_frame_t * frame)
 765 {
 766   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 767   u32 n_left, *from;
 768   u32 thread_index = vm->thread_index;
 769   ip6_main_t *im = &ip6_main;
 770   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 771   u16 nexts[VLIB_FRAME_SIZE], *next;
 772
 773   from = vlib_frame_vector_args (frame);
 774   n_left = frame->n_vectors;
 775   next = nexts;
 776
 777   vlib_get_buffers (vm, from, bufs, n_left);
 778
 779   while (n_left >= 4)
 780     {
 781       const load_balance_t *lb0, *lb1;
 782       const ip6_header_t *ip0, *ip1;
 783       u32 lbi0, hc0, lbi1, hc1;
 784       const dpo_id_t *dpo0, *dpo1;
 785
 786       /* Prefetch next iteration. */
 787       {
 788         vlib_prefetch_buffer_header (b[2], STORE);
 789         vlib_prefetch_buffer_header (b[3], STORE);
 790
 791         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), STORE);
 792         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), STORE);
 793       }
 794
 795       ip0 = vlib_buffer_get_current (b[0]);
 796       ip1 = vlib_buffer_get_current (b[1]);
 797       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 798       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 799
 800       lb0 = load_balance_get (lbi0);
 801       lb1 = load_balance_get (lbi1);
 802
 803       /*
 804        * this node is for via FIBs we can re-use the hash value from the
 805        * to node if present.
 806        * We don't want to use the same hash value at each level in the recursion
 807        * graph as that would lead to polarisation
 808        */
 809       hc0 = hc1 = 0;
 810
 811       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 812         {
 813           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 814             {
 815               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 816                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 817             }
 818           else
 819             {
 820               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 821                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 822             }
 823           dpo0 = load_balance_get_fwd_bucket
 824             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 825         }
 826       else
 827         {
 828           dpo0 = load_balance_get_bucket_i (lb0, 0);
 829         }
 830       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 831         {
 832           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 833             {
 834               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 835                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 836             }
 837           else
 838             {
 839               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 840                 ip6_compute_flow_hash (ip1, lb1->lb_hash_config);
 841             }
 842           dpo1 = load_balance_get_fwd_bucket
 843             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 844         }
 845       else
 846         {
 847           dpo1 = load_balance_get_bucket_i (lb1, 0);
 848         }
 849
 850       next[0] = dpo0->dpoi_next_node;
 851       next[1] = dpo1->dpoi_next_node;
 852
 853       /* Only process the HBH Option Header if explicitly configured to do so */
 854       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 855         {
 856           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 857             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 858         }
 859       /* Only process the HBH Option Header if explicitly configured to do so */
 860       if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 861         {
 862           next[1] = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
 863             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[1];
 864         }
 865
 866       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 867       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 868
 869       vlib_increment_combined_counter
 870         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 871       vlib_increment_combined_counter
 872         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 873
 874       b += 2;
 875       next += 2;
 876       n_left -= 2;
 877     }
 878
 879   while (n_left > 0)
 880     {
 881       const load_balance_t *lb0;
 882       const ip6_header_t *ip0;
 883       const dpo_id_t *dpo0;
 884       u32 lbi0, hc0;
 885
 886       ip0 = vlib_buffer_get_current (b[0]);
 887       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 888
 889       lb0 = load_balance_get (lbi0);
 890
 891       hc0 = 0;
 892       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 893         {
 894           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 895             {
 896               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 897                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 898             }
 899           else
 900             {
 901               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 902                 ip6_compute_flow_hash (ip0, lb0->lb_hash_config);
 903             }
 904           dpo0 = load_balance_get_fwd_bucket
 905             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 906         }
 907       else
 908         {
 909           dpo0 = load_balance_get_bucket_i (lb0, 0);
 910         }
 911
 912       next[0] = dpo0->dpoi_next_node;
 913       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 914
 915       /* Only process the HBH Option Header if explicitly configured to do so */
 916       if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 917         {
 918           next[0] = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
 919             (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next[0];
 920         }
 921
 922       vlib_increment_combined_counter
 923         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 924
 925       b += 1;
 926       next += 1;
 927       n_left -= 1;
 928     }
 929
 930   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 931
 932   if (node->flags & VLIB_NODE_FLAG_TRACE)
 933     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 934
 935   return frame->n_vectors;
 936 }
 937
 938 /* *INDENT-OFF* */
 939 VLIB_REGISTER_NODE (ip6_load_balance_node) =
 940 {
 941   .name = "ip6-load-balance",
 942   .vector_size = sizeof (u32),
 943   .sibling_of = "ip6-lookup",
 944   .format_trace = format_ip6_lookup_trace,
 945 };
 946 /* *INDENT-ON* */
 947
 948 typedef struct
 949 {
 950   /* Adjacency taken. */
 951   u32 adj_index;
 952   u32 flow_hash;
 953   u32 fib_index;
 954
 955   /* Packet data, possibly *after* rewrite. */
 956   u8 packet_data[128 - 1 * sizeof (u32)];
 957 }
 958 ip6_forward_next_trace_t;
 959
 960 #ifndef CLIB_MARCH_VARIANT
 961 u8 *
 962 format_ip6_forward_next_trace (u8 * s, va_list * args)
 963 {
 964   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 965   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 966   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 967   u32 indent = format_get_indent (s);
 968
 969   s = format (s, "%Ufib:%d adj:%d flow:%d",
 970               format_white_space, indent,
 971               t->fib_index, t->adj_index, t->flow_hash);
 972   s = format (s, "\n%U%U",
 973               format_white_space, indent,
 974               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 975   return s;
 976 }
 977 #endif
 978
 979 static u8 *
 980 format_ip6_lookup_trace (u8 * s, va_list * args)
 981 {
 982   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 983   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 984   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
 985   u32 indent = format_get_indent (s);
 986
 987   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 988               t->fib_index, t->adj_index, t->flow_hash);
 989   s = format (s, "\n%U%U",
 990               format_white_space, indent,
 991               format_ip6_header, t->packet_data, sizeof (t->packet_data));
 992   return s;
 993 }
 994
 995
 996 static u8 *
 997 format_ip6_rewrite_trace (u8 * s, va_list * args)
 998 {
 999   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1000   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1001   ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
1002   u32 indent = format_get_indent (s);
1003
1004   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
1005               t->fib_index, t->adj_index, format_ip_adjacency,
1006               t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1007   s = format (s, "\n%U%U",
1008               format_white_space, indent,
1009               format_ip_adjacency_packet_data,
1010               t->packet_data, sizeof (t->packet_data));
1011   return s;
1012 }
1013
1014 /* Common trace function for all ip6-forward next nodes. */
1015 #ifndef CLIB_MARCH_VARIANT
1016 void
1017 ip6_forward_next_trace (vlib_main_t * vm,
1018                         vlib_node_runtime_t * node,
1019                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1020 {
1021   u32 *from, n_left;
1022   ip6_main_t *im = &ip6_main;
1023
1024   n_left = frame->n_vectors;
1025   from = vlib_frame_vector_args (frame);
1026
1027   while (n_left >= 4)
1028     {
1029       u32 bi0, bi1;
1030       vlib_buffer_t *b0, *b1;
1031       ip6_forward_next_trace_t *t0, *t1;
1032
1033       /* Prefetch next iteration. */
1034       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1035       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1036
1037       bi0 = from[0];
1038       bi1 = from[1];
1039
1040       b0 = vlib_get_buffer (vm, bi0);
1041       b1 = vlib_get_buffer (vm, bi1);
1042
1043       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1044         {
1045           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1046           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1047           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1048           t0->fib_index =
1049             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1050              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1051             vec_elt (im->fib_index_by_sw_if_index,
1052                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1053
1054           clib_memcpy_fast (t0->packet_data,
1055                             vlib_buffer_get_current (b0),
1056                             sizeof (t0->packet_data));
1057         }
1058       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1059         {
1060           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1061           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1062           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1063           t1->fib_index =
1064             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1065              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1066             vec_elt (im->fib_index_by_sw_if_index,
1067                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1068
1069           clib_memcpy_fast (t1->packet_data,
1070                             vlib_buffer_get_current (b1),
1071                             sizeof (t1->packet_data));
1072         }
1073       from += 2;
1074       n_left -= 2;
1075     }
1076
1077   while (n_left >= 1)
1078     {
1079       u32 bi0;
1080       vlib_buffer_t *b0;
1081       ip6_forward_next_trace_t *t0;
1082
1083       bi0 = from[0];
1084
1085       b0 = vlib_get_buffer (vm, bi0);
1086
1087       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1088         {
1089           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1090           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1091           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1092           t0->fib_index =
1093             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1094              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1095             vec_elt (im->fib_index_by_sw_if_index,
1096                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1097
1098           clib_memcpy_fast (t0->packet_data,
1099                             vlib_buffer_get_current (b0),
1100                             sizeof (t0->packet_data));
1101         }
1102       from += 1;
1103       n_left -= 1;
1104     }
1105 }
1106
1107 /* Compute TCP/UDP/ICMP6 checksum in software. */
1108 u16
1109 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1110                                    ip6_header_t * ip0, int *bogus_lengthp)
1111 {
1112   ip_csum_t sum0 = 0;
1113   u16 payload_length, payload_length_host_byte_order;
1114   u32 i;
1115   u32 headers_size = sizeof (ip0[0]);
1116   u8 *data_this_buffer;
1117   u8 next_hdr = ip0->protocol;
1118
1119   ASSERT (bogus_lengthp);
1120   *bogus_lengthp = 0;
1121
1122   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1123   data_this_buffer = (u8 *) (ip0 + 1);
1124   payload_length = ip0->payload_length;
1125
1126   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
1127    * or UDP-Ping packets */
1128   if (PREDICT_FALSE (next_hdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1129     {
1130       u32 skip_bytes;
1131       ip6_hop_by_hop_ext_t *ext_hdr =
1132         (ip6_hop_by_hop_ext_t *) data_this_buffer;
1133
1134       /* validate really icmp6 next */
1135       ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1136               || (ext_hdr->next_hdr == IP_PROTOCOL_UDP));
1137
1138       skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
1139       data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
1140
1141       payload_length_host_byte_order -= skip_bytes;
1142       headers_size += skip_bytes;
1143
1144       /* pseudo-header adjustments:
1145        *   exclude ext header bytes from payload length
1146        *   use payload IP proto rather than ext header IP proto
1147        */
1148       payload_length = clib_host_to_net_u16 (payload_length_host_byte_order);
1149       next_hdr = ext_hdr->next_hdr;
1150     }
1151
1152   /* Initialize checksum with ip pseudo-header. */
1153   sum0 = payload_length + clib_host_to_net_u16 (next_hdr);
1154
1155   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1156     {
1157       sum0 = ip_csum_with_carry
1158         (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1159       sum0 = ip_csum_with_carry
1160         (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1161     }
1162
1163   if (p0)
1164     return ip_calculate_l4_checksum (vm, p0, sum0,
1165                                      payload_length_host_byte_order,
1166                                      (u8 *) ip0, headers_size, NULL);
1167   else
1168     return ip_calculate_l4_checksum (vm, 0, sum0,
1169                                      payload_length_host_byte_order, NULL, 0,
1170                                      data_this_buffer);
1171 }
1172
1173 u32
1174 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1175 {
1176   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1177   udp_header_t *udp0;
1178   u16 sum16;
1179   int bogus_length;
1180
1181   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1182   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1183           || ip0->protocol == IP_PROTOCOL_ICMP6
1184           || ip0->protocol == IP_PROTOCOL_UDP
1185           || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1186
1187   udp0 = (void *) (ip0 + 1);
1188   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1189     {
1190       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1191                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1192       return p0->flags;
1193     }
1194
1195   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1196
1197   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1198                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1199
1200   return p0->flags;
1201 }
1202 #endif
1203
1204 /**
1205  * @brief returns number of links on which src is reachable.
1206  */
1207 always_inline int
1208 ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
1209 {
1210   const load_balance_t *lb0;
1211   index_t lbi;
1212   u32 fib_index;
1213
1214   fib_index = vec_elt (im->fib_index_by_sw_if_index,
1215                        vnet_buffer (b)->sw_if_index[VLIB_RX]);
1216   fib_index =
1217     (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
1218     fib_index : vnet_buffer (b)->sw_if_index[VLIB_TX];
1219
1220   lbi = ip6_fib_table_fwding_lookup (fib_index, &i->src_address);
1221   lb0 = load_balance_get (lbi);
1222
1223   return (fib_urpf_check_size (lb0->lb_urpf));
1224 }
1225
1226 always_inline u8
1227 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0,
1228                            u32 * udp_offset0)
1229 {
1230   int nh = ip6_locate_header (p0, ip0, -1, udp_offset0);
1231   if (nh > 0)
1232     if (nh == IP_PROTOCOL_UDP || nh == IP_PROTOCOL_TCP)
1233       return nh;
1234   return 0;
1235 }
1236
1237 /* *INDENT-OFF* */
1238 VNET_FEATURE_ARC_INIT (ip6_local) = {
1239   .arc_name = "ip6-local",
1240   .start_nodes = VNET_FEATURES ("ip6-local", "ip6-receive"),
1241 };
1242 /* *INDENT-ON* */
1243
1244 static_always_inline u8
1245 ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
1246 {
1247
1248   u16 payload_length_host_byte_order;
1249   u32 n_this_buffer, n_bytes_left;
1250   ip6_header_t *ip0 = vlib_buffer_get_current (p0);
1251   u32 headers_size = sizeof (ip0[0]);
1252   u8 *data_this_buffer;
1253
1254
1255   data_this_buffer = (u8 *) (ip0 + 1);
1256
1257   ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer;
1258
1259   /* validate really icmp6 next */
1260
1261   if (!(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6)
1262       || (ext_hdr->next_hdr == IP_PROTOCOL_UDP))
1263     return 0;
1264
1265
1266   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1267   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1268
1269
1270   u32 n_ip_bytes_this_buffer =
1271     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1272   if (n_this_buffer + headers_size > n_ip_bytes_this_buffer)
1273     {
1274       n_this_buffer = p0->current_length > headers_size ?
1275         n_ip_bytes_this_buffer - headers_size : 0;
1276     }
1277
1278   n_bytes_left -= n_this_buffer;
1279   n_bytes_left -= vlib_buffer_length_in_chain (vm, p0) - p0->current_length;
1280
1281   if (n_bytes_left == 0)
1282     return 0;
1283   else
1284     return 1;
1285 }
1286
1287 always_inline uword
1288 ip6_local_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1289                   vlib_frame_t *frame, int head_of_feature_arc,
1290                   int is_receive_dpo)
1291 {
1292   ip6_main_t *im = &ip6_main;
1293   ip_lookup_main_t *lm = &im->lookup_main;
1294   u32 *from, n_left_from;
1295   vlib_node_runtime_t *error_node =
1296     vlib_node_get_runtime (vm, ip6_input_node.index);
1297   u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_index;
1298   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1299   u16 nexts[VLIB_FRAME_SIZE], *next;
1300
1301   from = vlib_frame_vector_args (frame);
1302   n_left_from = frame->n_vectors;
1303
1304   if (node->flags & VLIB_NODE_FLAG_TRACE)
1305     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1306
1307   vlib_get_buffers (vm, from, bufs, n_left_from);
1308   b = bufs;
1309   next = nexts;
1310
1311   while (n_left_from > 2)
1312     {
1313       /* Prefetch next iteration. */
1314       if (n_left_from >= 6)
1315         {
1316           vlib_prefetch_buffer_header (b[4], STORE);
1317           vlib_prefetch_buffer_header (b[5], STORE);
1318           vlib_prefetch_buffer_data (b[2], LOAD);
1319           vlib_prefetch_buffer_data (b[3], LOAD);
1320         }
1321
1322       ip6_error_t error[2];
1323       error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1324       error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1325
1326       ip6_header_t *ip[2];
1327       ip[0] = vlib_buffer_get_current (b[0]);
1328       ip[1] = vlib_buffer_get_current (b[1]);
1329
1330       if (head_of_feature_arc)
1331         {
1332           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1333           vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1334
1335           u8 type[2];
1336           type[0] = lm->builtin_protocol_by_ip_protocol[ip[0]->protocol];
1337           type[1] = lm->builtin_protocol_by_ip_protocol[ip[1]->protocol];
1338
1339           u32 flags[2];
1340           flags[0] = b[0]->flags;
1341           flags[1] = b[1]->flags;
1342
1343           vnet_buffer_oflags_t oflags[2];
1344           oflags[0] = vnet_buffer (b[0])->oflags;
1345           oflags[1] = vnet_buffer (b[1])->oflags;
1346
1347           u32 l4_offload[2];
1348           l4_offload[0] = (flags[0] & VNET_BUFFER_F_OFFLOAD) &&
1349                           (oflags[0] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1350                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1351           l4_offload[1] = (flags[1] & VNET_BUFFER_F_OFFLOAD) &&
1352                           (oflags[1] & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1353                                         VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1354
1355           u32 good_l4_csum[2];
1356           good_l4_csum[0] =
1357             (flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[0];
1358           good_l4_csum[1] =
1359             (flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload[1];
1360
1361           u32 udp_offset[2] = { };
1362           u8 is_tcp_udp[2];
1363           is_tcp_udp[0] =
1364             ip6_next_proto_is_tcp_udp (b[0], ip[0], &udp_offset[0]);
1365           is_tcp_udp[1] =
1366             ip6_next_proto_is_tcp_udp (b[1], ip[1], &udp_offset[1]);
1367           i16 len_diff[2] = { 0 };
1368           if (PREDICT_TRUE (is_tcp_udp[0]))
1369             {
1370               udp_header_t *udp =
1371                 (udp_header_t *) ((u8 *) ip[0] + udp_offset[0]);
1372               good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UDP
1373                 && udp->checksum == 0;
1374               /* optimistically verify UDP length. */
1375               u16 ip_len, udp_len;
1376               ip_len = clib_net_to_host_u16 (ip[0]->payload_length);
1377               udp_len = clib_net_to_host_u16 (udp->length);
1378               len_diff[0] = ip_len - udp_len;
1379             }
1380           if (PREDICT_TRUE (is_tcp_udp[1]))
1381             {
1382               udp_header_t *udp =
1383                 (udp_header_t *) ((u8 *) ip[1] + udp_offset[1]);
1384               good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UDP
1385                 && udp->checksum == 0;
1386               /* optimistically verify UDP length. */
1387               u16 ip_len, udp_len;
1388               ip_len = clib_net_to_host_u16 (ip[1]->payload_length);
1389               udp_len = clib_net_to_host_u16 (udp->length);
1390               len_diff[1] = ip_len - udp_len;
1391             }
1392
1393           good_l4_csum[0] |= type[0] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1394           good_l4_csum[1] |= type[1] == IP_BUILTIN_PROTOCOL_UNKNOWN;
1395
1396           len_diff[0] = type[0] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[0] : 0;
1397           len_diff[1] = type[1] == IP_BUILTIN_PROTOCOL_UDP ? len_diff[1] : 0;
1398
1399           u8 need_csum[2];
1400           need_csum[0] = type[0] != IP_BUILTIN_PROTOCOL_UNKNOWN
1401             && !good_l4_csum[0]
1402             && !(flags[0] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1403           need_csum[1] = type[1] != IP_BUILTIN_PROTOCOL_UNKNOWN
1404             && !good_l4_csum[1]
1405             && !(flags[1] & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1406           if (PREDICT_FALSE (need_csum[0]))
1407             {
1408               flags[0] = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1409               good_l4_csum[0] = flags[0] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1410               error[0] = IP6_ERROR_UNKNOWN_PROTOCOL;
1411             }
1412           else
1413             {
1414               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1415                 error[0] = IP6_ERROR_BAD_LENGTH;
1416             }
1417           if (PREDICT_FALSE (need_csum[1]))
1418             {
1419               flags[1] = ip6_tcp_udp_icmp_validate_checksum (vm, b[1]);
1420               good_l4_csum[1] = flags[1] & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1421               error[1] = IP6_ERROR_UNKNOWN_PROTOCOL;
1422             }
1423           else
1424             {
1425               if (ip6_tcp_udp_icmp_bad_length (vm, b[1]))
1426                 error[1] = IP6_ERROR_BAD_LENGTH;
1427             }
1428
1429
1430           error[0] = len_diff[0] < 0 ? IP6_ERROR_UDP_LENGTH : error[0];
1431
1432           error[1] = len_diff[1] < 0 ? IP6_ERROR_UDP_LENGTH : error[1];
1433
1434           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1435                          IP6_ERROR_UDP_CHECKSUM,
1436                          "Wrong IP6 errors constants");
1437           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1438                          IP6_ERROR_ICMP_CHECKSUM,
1439                          "Wrong IP6 errors constants");
1440
1441           error[0] =
1442             !good_l4_csum[0] ? IP6_ERROR_UDP_CHECKSUM + type[0] : error[0];
1443           error[1] =
1444             !good_l4_csum[1] ? IP6_ERROR_UDP_CHECKSUM + type[1] : error[1];
1445
1446           /* Drop packets from unroutable hosts. */
1447           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1448           u8 unroutable[2];
1449           unroutable[0] = error[0] == IP6_ERROR_UNKNOWN_PROTOCOL
1450             && type[0] != IP_BUILTIN_PROTOCOL_ICMP
1451             && !ip6_address_is_link_local_unicast (&ip[0]->src_address);
1452           unroutable[1] = error[1] == IP6_ERROR_UNKNOWN_PROTOCOL
1453             && type[1] != IP_BUILTIN_PROTOCOL_ICMP
1454             && !ip6_address_is_link_local_unicast (&ip[1]->src_address);
1455           if (PREDICT_FALSE (unroutable[0]))
1456             {
1457               error[0] =
1458                 !ip6_urpf_loose_check (im, b[0],
1459                                        ip[0]) ? IP6_ERROR_SRC_LOOKUP_MISS
1460                 : error[0];
1461             }
1462           if (PREDICT_FALSE (unroutable[1]))
1463             {
1464               error[1] =
1465                 !ip6_urpf_loose_check (im, b[1],
1466                                        ip[1]) ? IP6_ERROR_SRC_LOOKUP_MISS
1467                 : error[1];
1468             }
1469
1470           vnet_buffer (b[0])->ip.fib_index =
1471             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1472             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1473             vnet_buffer (b[0])->ip.fib_index;
1474           vnet_buffer (b[1])->ip.fib_index =
1475             vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1476             vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1477             vnet_buffer (b[1])->ip.fib_index;
1478
1479           vnet_buffer (b[0])->ip.rx_sw_if_index =
1480             vnet_buffer (b[0])->sw_if_index[VLIB_RX];
1481           vnet_buffer (b[1])->ip.rx_sw_if_index =
1482             vnet_buffer (b[1])->sw_if_index[VLIB_RX];
1483           if (is_receive_dpo)
1484             {
1485               const receive_dpo_t *rd0, *rd1;
1486               rd0 =
1487                 receive_dpo_get (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
1488               rd1 =
1489                 receive_dpo_get (vnet_buffer (b[1])->ip.adj_index[VLIB_TX]);
1490               if (rd0->rd_sw_if_index != ~0)
1491                 vnet_buffer (b[0])->ip.rx_sw_if_index = rd0->rd_sw_if_index;
1492               if (rd1->rd_sw_if_index != ~0)
1493                 vnet_buffer (b[1])->ip.rx_sw_if_index = rd1->rd_sw_if_index;
1494             }
1495         }                       /* head_of_feature_arc */
1496
1497       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1498       next[0] =
1499         error[0] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1500       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1501       next[1] =
1502         error[1] != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[1];
1503
1504       b[0]->error = error_node->errors[error[0]];
1505       b[1]->error = error_node->errors[error[1]];
1506
1507       if (head_of_feature_arc)
1508         {
1509           u8 ip6_unknown[2];
1510           ip6_unknown[0] = error[0] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1511           ip6_unknown[1] = error[1] == (u8) IP6_ERROR_UNKNOWN_PROTOCOL;
1512           if (PREDICT_TRUE (ip6_unknown[0]))
1513             {
1514               u32 next32 = next[0];
1515               vnet_feature_arc_start (arc_index,
1516                                       vnet_buffer (b[0])->ip.rx_sw_if_index,
1517                                       &next32, b[0]);
1518               next[0] = next32;
1519             }
1520           if (PREDICT_TRUE (ip6_unknown[1]))
1521             {
1522               u32 next32 = next[1];
1523               vnet_feature_arc_start (arc_index,
1524                                       vnet_buffer (b[1])->ip.rx_sw_if_index,
1525                                       &next32, b[1]);
1526               next[1] = next32;
1527             }
1528         }
1529
1530       /* next */
1531       b += 2;
1532       next += 2;
1533       n_left_from -= 2;
1534     }
1535
1536   while (n_left_from)
1537     {
1538       u8 error;
1539       error = IP6_ERROR_UNKNOWN_PROTOCOL;
1540
1541       ip6_header_t *ip;
1542       ip = vlib_buffer_get_current (b[0]);
1543
1544       if (head_of_feature_arc)
1545         {
1546           vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1547           u8 type = lm->builtin_protocol_by_ip_protocol[ip->protocol];
1548
1549           u32 flags = b[0]->flags;
1550
1551           vnet_buffer_oflags_t oflags = vnet_buffer (b[0])->oflags;
1552
1553           u32 l4_offload = (flags & VNET_BUFFER_F_OFFLOAD) &&
1554                            (oflags & (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM |
1555                                       VNET_BUFFER_OFFLOAD_F_UDP_CKSUM));
1556
1557           u32 good_l4_csum =
1558             (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) | l4_offload;
1559           u32 udp_offset;
1560           i16 len_diff = 0;
1561           u8 is_tcp_udp = ip6_next_proto_is_tcp_udp (b[0], ip, &udp_offset);
1562           if (PREDICT_TRUE (is_tcp_udp))
1563             {
1564               udp_header_t *udp = (udp_header_t *) ((u8 *) ip + udp_offset);
1565               /* Don't verify UDP checksum for packets with explicit zero checksum. */
1566               good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UDP
1567                 && udp->checksum == 0;
1568               /* optimistically verify UDP length. */
1569               u16 ip_len, udp_len;
1570               ip_len = clib_net_to_host_u16 (ip->payload_length);
1571               udp_len = clib_net_to_host_u16 (udp->length);
1572               len_diff = ip_len - udp_len;
1573             }
1574
1575           good_l4_csum |= type == IP_BUILTIN_PROTOCOL_UNKNOWN;
1576           len_diff = type == IP_BUILTIN_PROTOCOL_UDP ? len_diff : 0;
1577
1578           u8 need_csum = type != IP_BUILTIN_PROTOCOL_UNKNOWN &&
1579                          !good_l4_csum &&
1580                          !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED);
1581           if (PREDICT_FALSE (need_csum))
1582             {
1583               flags = ip6_tcp_udp_icmp_validate_checksum (vm, b[0]);
1584               good_l4_csum = flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT;
1585               error = IP6_ERROR_UNKNOWN_PROTOCOL;
1586             }
1587           else
1588             {
1589               if (ip6_tcp_udp_icmp_bad_length (vm, b[0]))
1590                 error = IP6_ERROR_BAD_LENGTH;
1591             }
1592
1593
1594
1595           error = len_diff < 0 ? IP6_ERROR_UDP_LENGTH : error;
1596           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
1597                          IP6_ERROR_UDP_CHECKSUM,
1598                          "Wrong IP6 errors constants");
1599           STATIC_ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
1600                          IP6_ERROR_ICMP_CHECKSUM,
1601                          "Wrong IP6 errors constants");
1602
1603           error = !good_l4_csum ? IP6_ERROR_UDP_CHECKSUM + type : error;
1604
1605           /* Drop packets from unroutable hosts. */
1606           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1607           u8 unroutable = error == IP6_ERROR_UNKNOWN_PROTOCOL
1608             && type != IP_BUILTIN_PROTOCOL_ICMP
1609             && !ip6_address_is_link_local_unicast (&ip->src_address);
1610           if (PREDICT_FALSE (unroutable))
1611             {
1612               error =
1613                 !ip6_urpf_loose_check (im, b[0],
1614                                        ip) ? IP6_ERROR_SRC_LOOKUP_MISS :
1615                 error;
1616             }
1617
1618           vnet_buffer (b[0])->ip.fib_index =
1619             vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1620             vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1621             vnet_buffer (b[0])->ip.fib_index;
1622
1623           vnet_buffer (b[0])->ip.rx_sw_if_index =
1624             vnet_buffer (b[0])->sw_if_index[VLIB_RX];
1625           if (is_receive_dpo)
1626             {
1627               receive_dpo_t *rd;
1628               rd = receive_dpo_get (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
1629               if (rd->rd_sw_if_index != ~0)
1630                 vnet_buffer (b[0])->ip.rx_sw_if_index = rd->rd_sw_if_index;
1631             }
1632         }                       /* head_of_feature_arc */
1633
1634       next[0] = lm->local_next_by_ip_protocol[ip->protocol];
1635       next[0] =
1636         error != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next[0];
1637
1638       b[0]->error = error_node->errors[error];
1639
1640       if (head_of_feature_arc)
1641         {
1642           if (PREDICT_TRUE (error == (u8) IP6_ERROR_UNKNOWN_PROTOCOL))
1643             {
1644               u32 next32 = next[0];
1645               vnet_feature_arc_start (arc_index,
1646                                       vnet_buffer (b[0])->ip.rx_sw_if_index,
1647                                       &next32, b[0]);
1648               next[0] = next32;
1649             }
1650         }
1651
1652       /* next */
1653       b += 1;
1654       next += 1;
1655       n_left_from -= 1;
1656     }
1657
1658   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1659   return frame->n_vectors;
1660 }
1661
1662 VLIB_NODE_FN (ip6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1663                                vlib_frame_t * frame)
1664 {
1665   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */,
1666                            0 /* ip6_local_inline */);
1667 }
1668
1669 VLIB_REGISTER_NODE (ip6_local_node) =
1670 {
1671   .name = "ip6-local",
1672   .vector_size = sizeof (u32),
1673   .format_trace = format_ip6_forward_next_trace,
1674   .n_next_nodes = IP_LOCAL_N_NEXT,
1675   .next_nodes =
1676   {
1677     [IP_LOCAL_NEXT_DROP] = "ip6-drop",
1678     [IP_LOCAL_NEXT_PUNT] = "ip6-punt",
1679     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1680     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1681     [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-local-full-reassembly",
1682   },
1683 };
1684
1685 VLIB_NODE_FN (ip6_receive_local_node)
1686 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1687 {
1688   return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */,
1689                            1 /* is_receive_dpo */);
1690 }
1691
1692 VLIB_REGISTER_NODE (ip6_receive_local_node) = {
1693   .name = "ip6-receive",
1694   .vector_size = sizeof (u32),
1695   .format_trace = format_ip6_forward_next_trace,
1696   .sibling_of = "ip6-local"
1697 };
1698
1699 VLIB_NODE_FN (ip6_local_end_of_arc_node) (vlib_main_t * vm,
1700                                           vlib_node_runtime_t * node,
1701                                           vlib_frame_t * frame)
1702 {
1703   return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */,
1704                            0 /* ip6_local_inline */);
1705 }
1706
1707 VLIB_REGISTER_NODE (ip6_local_end_of_arc_node) = {
1708   .name = "ip6-local-end-of-arc",
1709   .vector_size = sizeof (u32),
1710
1711   .format_trace = format_ip6_forward_next_trace,
1712   .sibling_of = "ip6-local",
1713 };
1714
1715 VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = {
1716   .arc_name = "ip6-local",
1717   .node_name = "ip6-local-end-of-arc",
1718   .runs_before = 0, /* not before any other features */
1719 };
1720
1721 #ifdef CLIB_MARCH_VARIANT
1722 extern vlib_node_registration_t ip6_local_node;
1723 #else
1724 void
1725 ip6_register_protocol (u32 protocol, u32 node_index)
1726 {
1727   vlib_main_t *vm = vlib_get_main ();
1728   ip6_main_t *im = &ip6_main;
1729   ip_lookup_main_t *lm = &im->lookup_main;
1730
1731   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1732   lm->local_next_by_ip_protocol[protocol] =
1733     vlib_node_add_next (vm, ip6_local_node.index, node_index);
1734 }
1735
1736 void
1737 ip6_unregister_protocol (u32 protocol)
1738 {
1739   ip6_main_t *im = &ip6_main;
1740   ip_lookup_main_t *lm = &im->lookup_main;
1741
1742   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1743   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1744 }
1745 #endif
1746
1747 typedef enum
1748 {
1749   IP6_REWRITE_NEXT_DROP,
1750   IP6_REWRITE_NEXT_ICMP_ERROR,
1751   IP6_REWRITE_NEXT_FRAGMENT,
1752   IP6_REWRITE_N_NEXT            /* Last */
1753 } ip6_rewrite_next_t;
1754
1755 /**
1756  * This bits of an IPv6 address to mask to construct a multicast
1757  * MAC address
1758  */
1759 #define IP6_MCAST_ADDR_MASK 0xffffffff
1760
1761 always_inline void
1762 ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
1763                u16 adj_packet_bytes, bool is_locally_generated,
1764                u32 * next, u8 is_midchain, u32 * error)
1765 {
1766   if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
1767     {
1768       if (is_locally_generated)
1769         {
1770           /* IP fragmentation */
1771           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1772                                    (is_midchain ?
1773                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1774                                     IP_FRAG_NEXT_IP_REWRITE), 0);
1775           *next = IP6_REWRITE_NEXT_FRAGMENT;
1776           *error = IP6_ERROR_MTU_EXCEEDED;
1777         }
1778       else
1779         {
1780           *error = IP6_ERROR_MTU_EXCEEDED;
1781           icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
1782                                        adj_packet_bytes);
1783           *next = IP6_REWRITE_NEXT_ICMP_ERROR;
1784         }
1785     }
1786 }
1787
1788 always_inline uword
1789 ip6_rewrite_inline_with_gso (vlib_main_t * vm,
1790                              vlib_node_runtime_t * node,
1791                              vlib_frame_t * frame,
1792                              int do_counters, int is_midchain, int is_mcast)
1793 {
1794   ip_lookup_main_t *lm = &ip6_main.lookup_main;
1795   u32 *from = vlib_frame_vector_args (frame);
1796   u32 n_left_from, n_left_to_next, *to_next, next_index;
1797   vlib_node_runtime_t *error_node =
1798     vlib_node_get_runtime (vm, ip6_input_node.index);
1799
1800   n_left_from = frame->n_vectors;
1801   next_index = node->cached_next_index;
1802   u32 thread_index = vm->thread_index;
1803
1804   while (n_left_from > 0)
1805     {
1806       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1807
1808       while (n_left_from >= 4 && n_left_to_next >= 2)
1809         {
1810           const ip_adjacency_t *adj0, *adj1;
1811           vlib_buffer_t *p0, *p1;
1812           ip6_header_t *ip0, *ip1;
1813           u32 pi0, rw_len0, next0, error0, adj_index0;
1814           u32 pi1, rw_len1, next1, error1, adj_index1;
1815           u32 tx_sw_if_index0, tx_sw_if_index1;
1816           bool is_locally_originated0, is_locally_originated1;
1817
1818           /* Prefetch next iteration. */
1819           {
1820             vlib_buffer_t *p2, *p3;
1821
1822             p2 = vlib_get_buffer (vm, from[2]);
1823             p3 = vlib_get_buffer (vm, from[3]);
1824
1825             vlib_prefetch_buffer_header (p2, LOAD);
1826             vlib_prefetch_buffer_header (p3, LOAD);
1827
1828             clib_prefetch_store (p2->pre_data);
1829             clib_prefetch_store (p3->pre_data);
1830
1831             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1832             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1833           }
1834
1835           pi0 = to_next[0] = from[0];
1836           pi1 = to_next[1] = from[1];
1837
1838           from += 2;
1839           n_left_from -= 2;
1840           to_next += 2;
1841           n_left_to_next -= 2;
1842
1843           p0 = vlib_get_buffer (vm, pi0);
1844           p1 = vlib_get_buffer (vm, pi1);
1845
1846           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1847           adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
1848
1849           ip0 = vlib_buffer_get_current (p0);
1850           ip1 = vlib_buffer_get_current (p1);
1851
1852           error0 = error1 = IP6_ERROR_NONE;
1853           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1854
1855           is_locally_originated0 =
1856             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1857           if (PREDICT_TRUE (!is_locally_originated0))
1858             {
1859               i32 hop_limit0 = ip0->hop_limit;
1860
1861               /* Input node should have reject packets with hop limit 0. */
1862               ASSERT (ip0->hop_limit > 0);
1863
1864               hop_limit0 -= 1;
1865
1866               ip0->hop_limit = hop_limit0;
1867
1868               /*
1869                * If the hop count drops below 1 when forwarding, generate
1870                * an ICMP response.
1871                */
1872               if (PREDICT_FALSE (hop_limit0 <= 0))
1873                 {
1874                   error0 = IP6_ERROR_TIME_EXPIRED;
1875                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1876                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1877                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
1878                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1879                                                0);
1880                 }
1881             }
1882
1883           is_locally_originated1 =
1884             p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
1885           if (PREDICT_TRUE (!is_locally_originated1))
1886             {
1887               i32 hop_limit1 = ip1->hop_limit;
1888
1889               /* Input node should have reject packets with hop limit 0. */
1890               ASSERT (ip1->hop_limit > 0);
1891
1892               hop_limit1 -= 1;
1893
1894               ip1->hop_limit = hop_limit1;
1895
1896               /*
1897                * If the hop count drops below 1 when forwarding, generate
1898                * an ICMP response.
1899                */
1900               if (PREDICT_FALSE (hop_limit1 <= 0))
1901                 {
1902                   error1 = IP6_ERROR_TIME_EXPIRED;
1903                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1904                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1905                   icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
1906                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
1907                                                0);
1908                 }
1909             }
1910
1911           adj0 = adj_get (adj_index0);
1912           adj1 = adj_get (adj_index1);
1913
1914           rw_len0 = adj0[0].rewrite_header.data_bytes;
1915           rw_len1 = adj1[0].rewrite_header.data_bytes;
1916           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
1917           vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
1918
1919           if (do_counters)
1920             {
1921               vlib_increment_combined_counter
1922                 (&adjacency_counters,
1923                  thread_index, adj_index0, 1,
1924                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
1925               vlib_increment_combined_counter
1926                 (&adjacency_counters,
1927                  thread_index, adj_index1, 1,
1928                  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
1929             }
1930
1931           /* Check MTU of outgoing interface. */
1932           u16 ip0_len =
1933             clib_net_to_host_u16 (ip0->payload_length) +
1934             sizeof (ip6_header_t);
1935           u16 ip1_len =
1936             clib_net_to_host_u16 (ip1->payload_length) +
1937             sizeof (ip6_header_t);
1938           if (p0->flags & VNET_BUFFER_F_GSO)
1939             ip0_len = gso_mtu_sz (p0);
1940           if (p1->flags & VNET_BUFFER_F_GSO)
1941             ip1_len = gso_mtu_sz (p1);
1942
1943           ip6_mtu_check (p0, ip0_len,
1944                          adj0[0].rewrite_header.max_l3_packet_bytes,
1945                          is_locally_originated0, &next0, is_midchain,
1946                          &error0);
1947           ip6_mtu_check (p1, ip1_len,
1948                          adj1[0].rewrite_header.max_l3_packet_bytes,
1949                          is_locally_originated1, &next1, is_midchain,
1950                          &error1);
1951           /* Don't adjust the buffer for hop count issue; icmp-error node
1952            * wants to see the IP header */
1953           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
1954             {
1955               p0->current_data -= rw_len0;
1956               p0->current_length += rw_len0;
1957               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1958               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
1959               next0 = adj0[0].rewrite_header.next_index;
1960               if (PREDICT_FALSE
1961                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1962                 vnet_feature_arc_start_w_cfg_index
1963                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
1964                    adj0->ia_cfg_index);
1965             }
1966           else
1967             {
1968               p0->error = error_node->errors[error0];
1969             }
1970           if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
1971             {
1972               p1->current_data -= rw_len1;
1973               p1->current_length += rw_len1;
1974
1975               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1976               vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
1977               next1 = adj1[0].rewrite_header.next_index;
1978
1979               if (PREDICT_FALSE
1980                   (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
1981                 vnet_feature_arc_start_w_cfg_index
1982                   (lm->output_feature_arc_index, tx_sw_if_index1, &next1, p1,
1983                    adj1->ia_cfg_index);
1984             }
1985           else
1986             {
1987               p1->error = error_node->errors[error1];
1988             }
1989
1990           if (is_midchain)
1991             {
1992               /* before we paint on the next header, update the L4
1993                * checksums if required, since there's no offload on a tunnel */
1994               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
1995                                           1 /* is_ip6 */ );
1996               vnet_calc_checksums_inline (vm, p1, 0 /* is_ip4 */ ,
1997                                           1 /* is_ip6 */ );
1998
1999               /* Guess we are only writing on ipv6 header. */
2000               vnet_rewrite_two_headers (adj0[0], adj1[0],
2001                                         ip0, ip1, sizeof (ip6_header_t));
2002             }
2003           else
2004             /* Guess we are only writing on simple Ethernet header. */
2005             vnet_rewrite_two_headers (adj0[0], adj1[0],
2006                                       ip0, ip1, sizeof (ethernet_header_t));
2007
2008           if (is_midchain)
2009             {
2010               if (adj0->sub_type.midchain.fixup_func)
2011                 adj0->sub_type.midchain.fixup_func
2012                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2013               if (adj1->sub_type.midchain.fixup_func)
2014                 adj1->sub_type.midchain.fixup_func
2015                   (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
2016             }
2017           if (is_mcast)
2018             {
2019               /*
2020                * copy bytes from the IP address into the MAC rewrite
2021                */
2022               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2023                                           adj0->
2024                                           rewrite_header.dst_mcast_offset,
2025                                           &ip0->dst_address.as_u32[3],
2026                                           (u8 *) ip0);
2027               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2028                                           adj1->
2029                                           rewrite_header.dst_mcast_offset,
2030                                           &ip1->dst_address.as_u32[3],
2031                                           (u8 *) ip1);
2032             }
2033
2034           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2035                                            to_next, n_left_to_next,
2036                                            pi0, pi1, next0, next1);
2037         }
2038
2039       while (n_left_from > 0 && n_left_to_next > 0)
2040         {
2041           ip_adjacency_t *adj0;
2042           vlib_buffer_t *p0;
2043           ip6_header_t *ip0;
2044           u32 pi0, rw_len0;
2045           u32 adj_index0, next0, error0;
2046           u32 tx_sw_if_index0;
2047           bool is_locally_originated0;
2048
2049           pi0 = to_next[0] = from[0];
2050
2051           p0 = vlib_get_buffer (vm, pi0);
2052
2053           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2054
2055           adj0 = adj_get (adj_index0);
2056
2057           ip0 = vlib_buffer_get_current (p0);
2058
2059           error0 = IP6_ERROR_NONE;
2060           next0 = IP6_REWRITE_NEXT_DROP;
2061
2062           /* Check hop limit */
2063           is_locally_originated0 =
2064             p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED;
2065           if (PREDICT_TRUE (!is_locally_originated0))
2066             {
2067               i32 hop_limit0 = ip0->hop_limit;
2068
2069               ASSERT (ip0->hop_limit > 0);
2070
2071               hop_limit0 -= 1;
2072
2073               ip0->hop_limit = hop_limit0;
2074
2075               if (PREDICT_FALSE (hop_limit0 <= 0))
2076                 {
2077                   /*
2078                    * If the hop count drops below 1 when forwarding, generate
2079                    * an ICMP response.
2080                    */
2081                   error0 = IP6_ERROR_TIME_EXPIRED;
2082                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
2083                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2084                   icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
2085                                                ICMP6_time_exceeded_ttl_exceeded_in_transit,
2086                                                0);
2087                 }
2088             }
2089
2090           if (is_midchain)
2091             {
2092               vnet_calc_checksums_inline (vm, p0, 0 /* is_ip4 */ ,
2093                                           1 /* is_ip6 */ );
2094
2095               /* Guess we are only writing on ip6 header. */
2096               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip6_header_t));
2097             }
2098           else
2099             /* Guess we are only writing on simple Ethernet header. */
2100             vnet_rewrite_one_header (adj0[0], ip0,
2101                                      sizeof (ethernet_header_t));
2102
2103           /* Update packet buffer attributes/set output interface. */
2104           rw_len0 = adj0[0].rewrite_header.data_bytes;
2105           vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2106
2107           if (do_counters)
2108             {
2109               vlib_increment_combined_counter
2110                 (&adjacency_counters,
2111                  thread_index, adj_index0, 1,
2112                  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2113             }
2114
2115           /* Check MTU of outgoing interface. */
2116           u16 ip0_len =
2117             clib_net_to_host_u16 (ip0->payload_length) +
2118             sizeof (ip6_header_t);
2119           if (p0->flags & VNET_BUFFER_F_GSO)
2120             ip0_len = gso_mtu_sz (p0);
2121
2122           ip6_mtu_check (p0, ip0_len,
2123                          adj0[0].rewrite_header.max_l3_packet_bytes,
2124                          is_locally_originated0, &next0, is_midchain,
2125                          &error0);
2126           /* Don't adjust the buffer for hop count issue; icmp-error node
2127            * wants to see the IP header */
2128           if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
2129             {
2130               p0->current_data -= rw_len0;
2131               p0->current_length += rw_len0;
2132
2133               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2134
2135               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2136               next0 = adj0[0].rewrite_header.next_index;
2137
2138               if (PREDICT_FALSE
2139                   (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2140                 vnet_feature_arc_start_w_cfg_index
2141                   (lm->output_feature_arc_index, tx_sw_if_index0, &next0, p0,
2142                    adj0->ia_cfg_index);
2143             }
2144           else
2145             {
2146               p0->error = error_node->errors[error0];
2147             }
2148
2149           if (is_midchain)
2150             {
2151               if (adj0->sub_type.midchain.fixup_func)
2152                 adj0->sub_type.midchain.fixup_func
2153                   (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2154             }
2155           if (is_mcast)
2156             {
2157               vnet_ip_mcast_fixup_header (IP6_MCAST_ADDR_MASK,
2158                                           adj0->
2159                                           rewrite_header.dst_mcast_offset,
2160                                           &ip0->dst_address.as_u32[3],
2161                                           (u8 *) ip0);
2162             }
2163
2164           from += 1;
2165           n_left_from -= 1;
2166           to_next += 1;
2167           n_left_to_next -= 1;
2168
2169           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2170                                            to_next, n_left_to_next,
2171                                            pi0, next0);
2172         }
2173
2174       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2175     }
2176
2177   /* Need to do trace after rewrites to pick up new packet data. */
2178   if (node->flags & VLIB_NODE_FLAG_TRACE)
2179     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2180
2181   return frame->n_vectors;
2182 }
2183
2184 always_inline uword
2185 ip6_rewrite_inline (vlib_main_t * vm,
2186                     vlib_node_runtime_t * node,
2187                     vlib_frame_t * frame,
2188                     int do_counters, int is_midchain, int is_mcast)
2189 {
2190   return ip6_rewrite_inline_with_gso (vm, node, frame, do_counters,
2191                                       is_midchain, is_mcast);
2192 }
2193
2194 VLIB_NODE_FN (ip6_rewrite_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_bcast_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, 0);
2210   else
2211     return ip6_rewrite_inline (vm, node, frame, 0, 0, 0);
2212 }
2213
2214 VLIB_NODE_FN (ip6_rewrite_mcast_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, 0, 1);
2220   else
2221     return ip6_rewrite_inline (vm, node, frame, 0, 0, 1);
2222 }
2223
2224 VLIB_NODE_FN (ip6_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, 0);
2230   else
2231     return ip6_rewrite_inline (vm, node, frame, 0, 1, 0);
2232 }
2233
2234 VLIB_NODE_FN (ip6_mcast_midchain_node) (vlib_main_t * vm,
2235                                         vlib_node_runtime_t * node,
2236                                         vlib_frame_t * frame)
2237 {
2238   if (adj_are_counters_enabled ())
2239     return ip6_rewrite_inline (vm, node, frame, 1, 1, 1);
2240   else
2241     return ip6_rewrite_inline (vm, node, frame, 0, 1, 1);
2242 }
2243
2244 /* *INDENT-OFF* */
2245 VLIB_REGISTER_NODE (ip6_midchain_node) =
2246 {
2247   .name = "ip6-midchain",
2248   .vector_size = sizeof (u32),
2249   .format_trace = format_ip6_forward_next_trace,
2250   .sibling_of = "ip6-rewrite",
2251   };
2252
2253 VLIB_REGISTER_NODE (ip6_rewrite_node) =
2254 {
2255   .name = "ip6-rewrite",
2256   .vector_size = sizeof (u32),
2257   .format_trace = format_ip6_rewrite_trace,
2258   .n_next_nodes = IP6_REWRITE_N_NEXT,
2259   .next_nodes =
2260   {
2261     [IP6_REWRITE_NEXT_DROP] = "ip6-drop",
2262     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2263     [IP6_REWRITE_NEXT_FRAGMENT] = "ip6-frag",
2264   },
2265 };
2266
2267 VLIB_REGISTER_NODE (ip6_rewrite_bcast_node) = {
2268   .name = "ip6-rewrite-bcast",
2269   .vector_size = sizeof (u32),
2270
2271   .format_trace = format_ip6_rewrite_trace,
2272   .sibling_of = "ip6-rewrite",
2273 };
2274
2275 VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) =
2276 {
2277   .name = "ip6-rewrite-mcast",
2278   .vector_size = sizeof (u32),
2279   .format_trace = format_ip6_rewrite_trace,
2280   .sibling_of = "ip6-rewrite",
2281 };
2282
2283
2284 VLIB_REGISTER_NODE (ip6_mcast_midchain_node) =
2285 {
2286   .name = "ip6-mcast-midchain",
2287   .vector_size = sizeof (u32),
2288   .format_trace = format_ip6_rewrite_trace,
2289   .sibling_of = "ip6-rewrite",
2290 };
2291
2292 /* *INDENT-ON* */
2293
2294 /*
2295  * Hop-by-Hop handling
2296  */
2297 #ifndef CLIB_MARCH_VARIANT
2298 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2299 #endif /* CLIB_MARCH_VARIANT */
2300
2301 #define foreach_ip6_hop_by_hop_error \
2302 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2303 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2304 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2305
2306 /* *INDENT-OFF* */
2307 typedef enum
2308 {
2309 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2310   foreach_ip6_hop_by_hop_error
2311 #undef _
2312   IP6_HOP_BY_HOP_N_ERROR,
2313 } ip6_hop_by_hop_error_t;
2314 /* *INDENT-ON* */
2315
2316 /*
2317  * Primary h-b-h handler trace support
2318  * We work pretty hard on the problem for obvious reasons
2319  */
2320 typedef struct
2321 {
2322   u32 next_index;
2323   u32 trace_len;
2324   u8 option_data[256];
2325 } ip6_hop_by_hop_trace_t;
2326
2327 extern vlib_node_registration_t ip6_hop_by_hop_node;
2328
2329 static char *ip6_hop_by_hop_error_strings[] = {
2330 #define _(sym,string) string,
2331   foreach_ip6_hop_by_hop_error
2332 #undef _
2333 };
2334
2335 #ifndef CLIB_MARCH_VARIANT
2336 u8 *
2337 format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args)
2338 {
2339   ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *);
2340   int total_len = va_arg (*args, int);
2341   ip6_hop_by_hop_option_t *opt0, *limit0;
2342   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2343   u8 type0;
2344   s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d",
2345               hbh0->protocol, (hbh0->length + 1) << 3, total_len);
2346
2347   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2348   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len);
2349
2350   while (opt0 < limit0)
2351     {
2352       type0 = opt0->type;
2353       switch (type0)
2354         {
2355         case 0:         /* Pad, just stop */
2356           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1);
2357           break;
2358
2359         default:
2360           if (hm->trace[type0])
2361             {
2362               s = (*hm->trace[type0]) (s, opt0);
2363             }
2364           else
2365             {
2366               s = format (s, "\n    unrecognized option %d length %d", type0,
2367                           opt0->length);
2368             }
2369           opt0 =
2370             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2371                                          sizeof (ip6_hop_by_hop_option_t));
2372           break;
2373         }
2374     }
2375   return s;
2376 }
2377 #endif
2378
2379 static u8 *
2380 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2381 {
2382   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2383   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2384   ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2385   ip6_hop_by_hop_header_t *hbh0;
2386   ip6_hop_by_hop_option_t *opt0, *limit0;
2387   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2388
2389   u8 type0;
2390
2391   hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
2392
2393   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2394               t->next_index, (hbh0->length + 1) << 3, t->trace_len);
2395
2396   opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2397   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
2398
2399   while (opt0 < limit0)
2400     {
2401       type0 = opt0->type;
2402       switch (type0)
2403         {
2404         case 0:         /* Pad, just stop */
2405           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2406           break;
2407
2408         default:
2409           if (hm->trace[type0])
2410             {
2411               s = (*hm->trace[type0]) (s, opt0);
2412             }
2413           else
2414             {
2415               s = format (s, "\n    unrecognized option %d length %d", type0,
2416                           opt0->length);
2417             }
2418           opt0 =
2419             (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2420                                          sizeof (ip6_hop_by_hop_option_t));
2421           break;
2422         }
2423     }
2424   return s;
2425 }
2426
2427 always_inline u8
2428 ip6_scan_hbh_options (vlib_buffer_t * b0,
2429                       ip6_header_t * ip0,
2430                       ip6_hop_by_hop_header_t * hbh0,
2431                       ip6_hop_by_hop_option_t * opt0,
2432                       ip6_hop_by_hop_option_t * limit0, u32 * next0)
2433 {
2434   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2435   u8 type0;
2436   u8 error0 = 0;
2437
2438   while (opt0 < limit0)
2439     {
2440       type0 = opt0->type;
2441       switch (type0)
2442         {
2443         case 0:         /* Pad1 */
2444           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
2445           continue;
2446         case 1:         /* PadN */
2447           break;
2448         default:
2449           if (hm->options[type0])
2450             {
2451               if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
2452                 {
2453                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2454                   return (error0);
2455                 }
2456             }
2457           else
2458             {
2459               /* Unrecognized mandatory option, check the two high order bits */
2460               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2461                 {
2462                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2463                   break;
2464                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2465                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2466                   *next0 = IP_LOOKUP_NEXT_DROP;
2467                   break;
2468                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2469                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2470                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2471                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
2472                                                ICMP6_parameter_problem_unrecognized_option,
2473                                                (u8 *) opt0 - (u8 *) ip0);
2474                   break;
2475                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2476                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2477                   if (!ip6_address_is_multicast (&ip0->dst_address))
2478                     {
2479                       *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2480                       icmp6_error_set_vnet_buffer (b0,
2481                                                    ICMP6_parameter_problem,
2482                                                    ICMP6_parameter_problem_unrecognized_option,
2483                                                    (u8 *) opt0 - (u8 *) ip0);
2484                     }
2485                   else
2486                     {
2487                       *next0 = IP_LOOKUP_NEXT_DROP;
2488                     }
2489                   break;
2490                 }
2491               return (error0);
2492             }
2493         }
2494       opt0 =
2495         (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
2496                                      sizeof (ip6_hop_by_hop_option_t));
2497     }
2498   return (error0);
2499 }
2500
2501 /*
2502  * Process the Hop-by-Hop Options header
2503  */
2504 VLIB_NODE_FN (ip6_hop_by_hop_node) (vlib_main_t * vm,
2505                                     vlib_node_runtime_t * node,
2506                                     vlib_frame_t * frame)
2507 {
2508   vlib_node_runtime_t *error_node =
2509     vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
2510   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2511   u32 n_left_from, *from, *to_next;
2512   ip_lookup_next_t next_index;
2513
2514   from = vlib_frame_vector_args (frame);
2515   n_left_from = frame->n_vectors;
2516   next_index = node->cached_next_index;
2517
2518   while (n_left_from > 0)
2519     {
2520       u32 n_left_to_next;
2521
2522       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2523
2524       while (n_left_from >= 4 && n_left_to_next >= 2)
2525         {
2526           u32 bi0, bi1;
2527           vlib_buffer_t *b0, *b1;
2528           u32 next0, next1;
2529           ip6_header_t *ip0, *ip1;
2530           ip6_hop_by_hop_header_t *hbh0, *hbh1;
2531           ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2532           u8 error0 = 0, error1 = 0;
2533
2534           /* Prefetch next iteration. */
2535           {
2536             vlib_buffer_t *p2, *p3;
2537
2538             p2 = vlib_get_buffer (vm, from[2]);
2539             p3 = vlib_get_buffer (vm, from[3]);
2540
2541             vlib_prefetch_buffer_header (p2, LOAD);
2542             vlib_prefetch_buffer_header (p3, LOAD);
2543
2544             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2545             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2546           }
2547
2548           /* Speculatively enqueue b0, b1 to the current next frame */
2549           to_next[0] = bi0 = from[0];
2550           to_next[1] = bi1 = from[1];
2551           from += 2;
2552           to_next += 2;
2553           n_left_from -= 2;
2554           n_left_to_next -= 2;
2555
2556           b0 = vlib_get_buffer (vm, bi0);
2557           b1 = vlib_get_buffer (vm, bi1);
2558
2559           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2560           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2561           ip_adjacency_t *adj0 = adj_get (adj_index0);
2562           u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
2563           ip_adjacency_t *adj1 = adj_get (adj_index1);
2564
2565           /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2566           next0 = adj0->lookup_next_index;
2567           next1 = adj1->lookup_next_index;
2568
2569           ip0 = vlib_buffer_get_current (b0);
2570           ip1 = vlib_buffer_get_current (b1);
2571           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2572           hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
2573           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2574           opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
2575           limit0 =
2576             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2577                                          ((hbh0->length + 1) << 3));
2578           limit1 =
2579             (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
2580                                          ((hbh1->length + 1) << 3));
2581
2582           /*
2583            * Basic validity checks
2584            */
2585           if ((hbh0->length + 1) << 3 >
2586               clib_net_to_host_u16 (ip0->payload_length))
2587             {
2588               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2589               next0 = IP_LOOKUP_NEXT_DROP;
2590               goto outdual;
2591             }
2592           /* Scan the set of h-b-h options, process ones that we understand */
2593           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2594
2595           if ((hbh1->length + 1) << 3 >
2596               clib_net_to_host_u16 (ip1->payload_length))
2597             {
2598               error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2599               next1 = IP_LOOKUP_NEXT_DROP;
2600               goto outdual;
2601             }
2602           /* Scan the set of h-b-h options, process ones that we understand */
2603           error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
2604
2605         outdual:
2606           /* Has the classifier flagged this buffer for special treatment? */
2607           if (PREDICT_FALSE
2608               ((error0 == 0)
2609                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2610             next0 = hm->next_override;
2611
2612           /* Has the classifier flagged this buffer for special treatment? */
2613           if (PREDICT_FALSE
2614               ((error1 == 0)
2615                && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
2616             next1 = hm->next_override;
2617
2618           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
2619             {
2620               if (b0->flags & VLIB_BUFFER_IS_TRACED)
2621                 {
2622                   ip6_hop_by_hop_trace_t *t =
2623                     vlib_add_trace (vm, node, b0, sizeof (*t));
2624                   u32 trace_len = (hbh0->length + 1) << 3;
2625                   t->next_index = next0;
2626                   /* Capture the h-b-h option verbatim */
2627                   trace_len =
2628                     trace_len <
2629                     ARRAY_LEN (t->option_data) ? trace_len :
2630                     ARRAY_LEN (t->option_data);
2631                   t->trace_len = trace_len;
2632                   clib_memcpy_fast (t->option_data, hbh0, trace_len);
2633                 }
2634               if (b1->flags & VLIB_BUFFER_IS_TRACED)
2635                 {
2636                   ip6_hop_by_hop_trace_t *t =
2637                     vlib_add_trace (vm, node, b1, sizeof (*t));
2638                   u32 trace_len = (hbh1->length + 1) << 3;
2639                   t->next_index = next1;
2640                   /* Capture the h-b-h option verbatim */
2641                   trace_len =
2642                     trace_len <
2643                     ARRAY_LEN (t->option_data) ? trace_len :
2644                     ARRAY_LEN (t->option_data);
2645                   t->trace_len = trace_len;
2646                   clib_memcpy_fast (t->option_data, hbh1, trace_len);
2647                 }
2648
2649             }
2650
2651           b0->error = error_node->errors[error0];
2652           b1->error = error_node->errors[error1];
2653
2654           /* verify speculative enqueue, maybe switch current next frame */
2655           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
2656                                            n_left_to_next, bi0, bi1, next0,
2657                                            next1);
2658         }
2659
2660       while (n_left_from > 0 && n_left_to_next > 0)
2661         {
2662           u32 bi0;
2663           vlib_buffer_t *b0;
2664           u32 next0;
2665           ip6_header_t *ip0;
2666           ip6_hop_by_hop_header_t *hbh0;
2667           ip6_hop_by_hop_option_t *opt0, *limit0;
2668           u8 error0 = 0;
2669
2670           /* Speculatively enqueue b0 to the current next frame */
2671           bi0 = from[0];
2672           to_next[0] = bi0;
2673           from += 1;
2674           to_next += 1;
2675           n_left_from -= 1;
2676           n_left_to_next -= 1;
2677
2678           b0 = vlib_get_buffer (vm, bi0);
2679           /*
2680            * Default use the next_index from the adjacency.
2681            * A HBH option rarely redirects to a different node
2682            */
2683           u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
2684           ip_adjacency_t *adj0 = adj_get (adj_index0);
2685           next0 = adj0->lookup_next_index;
2686
2687           ip0 = vlib_buffer_get_current (b0);
2688           hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
2689           opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
2690           limit0 =
2691             (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
2692                                          ((hbh0->length + 1) << 3));
2693
2694           /*
2695            * Basic validity checks
2696            */
2697           if ((hbh0->length + 1) << 3 >
2698               clib_net_to_host_u16 (ip0->payload_length))
2699             {
2700               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2701               next0 = IP_LOOKUP_NEXT_DROP;
2702               goto out0;
2703             }
2704
2705           /* Scan the set of h-b-h options, process ones that we understand */
2706           error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
2707
2708         out0:
2709           /* Has the classifier flagged this buffer for special treatment? */
2710           if (PREDICT_FALSE
2711               ((error0 == 0)
2712                && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
2713             next0 = hm->next_override;
2714
2715           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2716             {
2717               ip6_hop_by_hop_trace_t *t =
2718                 vlib_add_trace (vm, node, b0, sizeof (*t));
2719               u32 trace_len = (hbh0->length + 1) << 3;
2720               t->next_index = next0;
2721               /* Capture the h-b-h option verbatim */
2722               trace_len =
2723                 trace_len <
2724                 ARRAY_LEN (t->option_data) ? trace_len :
2725                 ARRAY_LEN (t->option_data);
2726               t->trace_len = trace_len;
2727               clib_memcpy_fast (t->option_data, hbh0, trace_len);
2728             }
2729
2730           b0->error = error_node->errors[error0];
2731
2732           /* verify speculative enqueue, maybe switch current next frame */
2733           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2734                                            n_left_to_next, bi0, next0);
2735         }
2736       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2737     }
2738   return frame->n_vectors;
2739 }
2740
2741 /* *INDENT-OFF* */
2742 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
2743 {
2744   .name = "ip6-hop-by-hop",
2745   .sibling_of = "ip6-lookup",
2746   .vector_size = sizeof (u32),
2747   .format_trace = format_ip6_hop_by_hop_trace,
2748   .type = VLIB_NODE_TYPE_INTERNAL,
2749   .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
2750   .error_strings = ip6_hop_by_hop_error_strings,
2751   .n_next_nodes = 0,
2752 };
2753 /* *INDENT-ON* */
2754
2755 static clib_error_t *
2756 ip6_hop_by_hop_init (vlib_main_t * vm)
2757 {
2758   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2759   clib_memset (hm->options, 0, sizeof (hm->options));
2760   clib_memset (hm->trace, 0, sizeof (hm->trace));
2761   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2762   return (0);
2763 }
2764
2765 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2766
2767 #ifndef CLIB_MARCH_VARIANT
2768 void
2769 ip6_hbh_set_next_override (uword next)
2770 {
2771   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2772
2773   hm->next_override = next;
2774 }
2775
2776 int
2777 ip6_hbh_register_option (u8 option,
2778                          int options (vlib_buffer_t * b, ip6_header_t * ip,
2779                                       ip6_hop_by_hop_option_t * opt),
2780                          u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
2781 {
2782   ip6_main_t *im = &ip6_main;
2783   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2784
2785   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2786
2787   /* Already registered */
2788   if (hm->options[option])
2789     return (-1);
2790
2791   hm->options[option] = options;
2792   hm->trace[option] = trace;
2793
2794   /* Set global variable */
2795   im->hbh_enabled = 1;
2796
2797   return (0);
2798 }
2799
2800 int
2801 ip6_hbh_unregister_option (u8 option)
2802 {
2803   ip6_main_t *im = &ip6_main;
2804   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2805
2806   ASSERT ((u32) option < ARRAY_LEN (hm->options));
2807
2808   /* Not registered */
2809   if (!hm->options[option])
2810     return (-1);
2811
2812   hm->options[option] = NULL;
2813   hm->trace[option] = NULL;
2814
2815   /* Disable global knob if this was the last option configured */
2816   int i;
2817   bool found = false;
2818   for (i = 0; i < 256; i++)
2819     {
2820       if (hm->options[option])
2821         {
2822           found = true;
2823           break;
2824         }
2825     }
2826   if (!found)
2827     im->hbh_enabled = 0;
2828
2829   return (0);
2830 }
2831
2832 /* Global IP6 main. */
2833 ip6_main_t ip6_main;
2834 #endif
2835
2836 static clib_error_t *
2837 ip6_lookup_init (vlib_main_t * vm)
2838 {
2839   ip6_main_t *im = &ip6_main;
2840   clib_error_t *error;
2841   uword i;
2842
2843   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2844     return error;
2845
2846   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2847     {
2848       u32 j, i0, i1;
2849
2850       i0 = i / 32;
2851       i1 = i % 32;
2852
2853       for (j = 0; j < i0; j++)
2854         im->fib_masks[i].as_u32[j] = ~0;
2855
2856       if (i1)
2857         im->fib_masks[i].as_u32[i0] =
2858           clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2859     }
2860
2861   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2862
2863   /* Create FIB with index 0 and table id of 0. */
2864   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2865                                      FIB_SOURCE_DEFAULT_ROUTE);
2866   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0,
2867                                       MFIB_SOURCE_DEFAULT_ROUTE);
2868
2869   {
2870     pg_node_t *pn;
2871     pn = pg_get_node (ip6_lookup_node.index);
2872     pn->unformat_edit = unformat_pg_ip6_header;
2873   }
2874
2875   /* Unless explicitly configured, don't process HBH options */
2876   im->hbh_enabled = 0;
2877
2878   return error;
2879 }
2880
2881 VLIB_INIT_FUNCTION (ip6_lookup_init);
2882
2883 static clib_error_t *
2884 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2885                               unformat_input_t * input,
2886                               vlib_cli_command_t * cmd)
2887 {
2888   int matched = 0;
2889   u32 table_id = 0;
2890   u32 flow_hash_config = 0;
2891   int rv;
2892
2893   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2894     {
2895       if (unformat (input, "table %d", &table_id))
2896         matched = 1;
2897 #define _(a, b, v)                                                            \
2898   else if (unformat (input, #a))                                              \
2899   {                                                                           \
2900     flow_hash_config |= v;                                                    \
2901     matched = 1;                                                              \
2902   }
2903       foreach_flow_hash_bit
2904 #undef _
2905         else
2906         break;
2907     }
2908
2909   if (matched == 0)
2910     return clib_error_return (0, "unknown input `%U'",
2911                               format_unformat_error, input);
2912
2913   rv = ip_flow_hash_set (AF_IP6, table_id, flow_hash_config);
2914   switch (rv)
2915     {
2916     case 0:
2917       break;
2918
2919     case -1:
2920       return clib_error_return (0, "no such FIB table %d", table_id);
2921
2922     default:
2923       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2924       break;
2925     }
2926
2927   return 0;
2928 }
2929
2930 /*?
2931  * Configure the set of IPv6 fields used by the flow hash.
2932  *
2933  * @cliexpar
2934  * @parblock
2935  * Example of how to set the flow hash on a given table:
2936  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2937  *
2938  * Example of display the configured flow hash:
2939  * @cliexstart{show ip6 fib}
2940  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2941  * @::/0
2942  *   unicast-ip6-chain
2943  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2944  *     [0] [@0]: dpo-drop ip6
2945  * fe80::/10
2946  *   unicast-ip6-chain
2947  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2948  *     [0] [@2]: dpo-receive
2949  * ff02::1/128
2950  *   unicast-ip6-chain
2951  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2952  *     [0] [@2]: dpo-receive
2953  * ff02::2/128
2954  *   unicast-ip6-chain
2955  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2956  *     [0] [@2]: dpo-receive
2957  * ff02::16/128
2958  *   unicast-ip6-chain
2959  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2960  *     [0] [@2]: dpo-receive
2961  * ff02::1:ff00:0/104
2962  *   unicast-ip6-chain
2963  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2964  *     [0] [@2]: dpo-receive
2965  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2966  * @::/0
2967  *   unicast-ip6-chain
2968  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2969  *     [0] [@0]: dpo-drop ip6
2970  * @::a:1:1:0:4/126
2971  *   unicast-ip6-chain
2972  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2973  *     [0] [@4]: ipv6-glean: af_packet0
2974  * @::a:1:1:0:7/128
2975  *   unicast-ip6-chain
2976  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2977  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2978  * fe80::/10
2979  *   unicast-ip6-chain
2980  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2981  *     [0] [@2]: dpo-receive
2982  * fe80::fe:3eff:fe3e:9222/128
2983  *   unicast-ip6-chain
2984  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2985  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2986  * ff02::1/128
2987  *   unicast-ip6-chain
2988  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2989  *     [0] [@2]: dpo-receive
2990  * ff02::2/128
2991  *   unicast-ip6-chain
2992  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2993  *     [0] [@2]: dpo-receive
2994  * ff02::16/128
2995  *   unicast-ip6-chain
2996  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2997  *     [0] [@2]: dpo-receive
2998  * ff02::1:ff00:0/104
2999  *   unicast-ip6-chain
3000  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
3001  *     [0] [@2]: dpo-receive
3002  * @cliexend
3003  * @endparblock
3004 ?*/
3005 /* *INDENT-OFF* */
3006 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
3007   .path = "set ip6 flow-hash",
3008   .short_help = "set ip6 flow-hash table <table-id> [src] [dst] [sport] "
3009                 "[dport] [proto] [reverse] [flowlabel]",
3010   .function = set_ip6_flow_hash_command_fn,
3011 };
3012 /* *INDENT-ON* */
3013
3014 static clib_error_t *
3015 show_ip6_local_command_fn (vlib_main_t * vm,
3016                            unformat_input_t * input, vlib_cli_command_t * cmd)
3017 {
3018   ip6_main_t *im = &ip6_main;
3019   ip_lookup_main_t *lm = &im->lookup_main;
3020   int i;
3021
3022   vlib_cli_output (vm, "Protocols handled by ip6_local");
3023   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
3024     {
3025       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3026         {
3027
3028           u32 node_index = vlib_get_node (vm,
3029                                           ip6_local_node.index)->
3030             next_nodes[lm->local_next_by_ip_protocol[i]];
3031           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
3032                            node_index);
3033         }
3034     }
3035   return 0;
3036 }
3037
3038
3039
3040 /*?
3041  * Display the set of protocols handled by the local IPv6 stack.
3042  *
3043  * @cliexpar
3044  * Example of how to display local protocol table:
3045  * @cliexstart{show ip6 local}
3046  * Protocols handled by ip6_local
3047  * 17
3048  * 43
3049  * 58
3050  * 115
3051  * @cliexend
3052 ?*/
3053 /* *INDENT-OFF* */
3054 VLIB_CLI_COMMAND (show_ip6_local, static) =
3055 {
3056   .path = "show ip6 local",
3057   .function = show_ip6_local_command_fn,
3058   .short_help = "show ip6 local",
3059 };
3060 /* *INDENT-ON* */
3061
3062 #ifndef CLIB_MARCH_VARIANT
3063 int
3064 vnet_set_ip6_classify_intfc (vlib_main_t *vm, u32 sw_if_index, u32 table_index)
3065 {
3066   vnet_main_t *vnm = vnet_get_main ();
3067   vnet_interface_main_t *im = &vnm->interface_main;
3068   ip6_main_t *ipm = &ip6_main;
3069   ip_lookup_main_t *lm = &ipm->lookup_main;
3070   vnet_classify_main_t *cm = &vnet_classify_main;
3071   ip6_address_t *if_addr;
3072
3073   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3074     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3075
3076   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3077     return VNET_API_ERROR_NO_SUCH_ENTRY;
3078
3079   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3080   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3081
3082   if_addr = ip6_interface_first_address (ipm, sw_if_index);
3083
3084   if (NULL != if_addr)
3085     {
3086       fib_prefix_t pfx = {
3087         .fp_len = 128,
3088         .fp_proto = FIB_PROTOCOL_IP6,
3089         .fp_addr.ip6 = *if_addr,
3090       };
3091       u32 fib_index;
3092
3093       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3094                                                        sw_if_index);
3095       if (table_index != (u32) ~ 0)
3096         {
3097           dpo_id_t dpo = DPO_INVALID;
3098           dpo_set (&dpo,
3099                    DPO_CLASSIFY,
3100                    DPO_PROTO_IP6,
3101                    classify_dpo_create (DPO_PROTO_IP6, table_index));
3102           fib_table_entry_special_dpo_add (fib_index,
3103                                            &pfx,
3104                                            FIB_SOURCE_CLASSIFY,
3105                                            FIB_ENTRY_FLAG_NONE, &dpo);
3106           dpo_reset (&dpo);
3107         }
3108       else
3109         {
3110           fib_table_entry_special_remove (fib_index,
3111                                           &pfx, FIB_SOURCE_CLASSIFY);
3112         }
3113     }
3114
3115   return 0;
3116 }
3117 #endif
3118
3119 static clib_error_t *
3120 set_ip6_classify_command_fn (vlib_main_t * vm,
3121                              unformat_input_t * input,
3122                              vlib_cli_command_t * cmd)
3123 {
3124   u32 table_index = ~0;
3125   int table_index_set = 0;
3126   u32 sw_if_index = ~0;
3127   int rv;
3128
3129   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3130     {
3131       if (unformat (input, "table-index %d", &table_index))
3132         table_index_set = 1;
3133       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3134                          vnet_get_main (), &sw_if_index))
3135         ;
3136       else
3137         break;
3138     }
3139
3140   if (table_index_set == 0)
3141     return clib_error_return (0, "classify table-index must be specified");
3142
3143   if (sw_if_index == ~0)
3144     return clib_error_return (0, "interface / subif must be specified");
3145
3146   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3147
3148   switch (rv)
3149     {
3150     case 0:
3151       break;
3152
3153     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3154       return clib_error_return (0, "No such interface");
3155
3156     case VNET_API_ERROR_NO_SUCH_ENTRY:
3157       return clib_error_return (0, "No such classifier table");
3158     }
3159   return 0;
3160 }
3161
3162 /*?
3163  * Assign a classification table to an interface. The classification
3164  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3165  * commands. Once the table is create, use this command to filter packets
3166  * on an interface.
3167  *
3168  * @cliexpar
3169  * Example of how to assign a classification table to an interface:
3170  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3171 ?*/
3172 /* *INDENT-OFF* */
3173 VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
3174 {
3175   .path = "set ip6 classify",
3176   .short_help =
3177   "set ip6 classify intfc <interface> table-index <classify-idx>",
3178   .function = set_ip6_classify_command_fn,
3179 };
3180 /* *INDENT-ON* */
3181
3182 /*
3183  * fd.io coding-style-patch-verification: ON
3184  *
3185  * Local Variables:
3186  * eval: (c-set-style "gnu")
3187  * End:
3188  */