src/vnet/ip/ip4_forward.c

   1 /*
   2  * Copyright (c) 2015 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/ip4_forward.c: IP v4 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/ethernet/ethernet.h>     /* for ethernet_header_t */
  44 #include <vnet/ethernet/arp_packet.h>   /* for ethernet_arp_header_t */
  45 #include <vnet/ppp/ppp.h>
  46 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  47 #include <vnet/api_errno.h>     /* for API error numbers */
  48 #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
  49 #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
  50 #include <vnet/fib/fib_urpf_list.h>     /* for FIB uRPF check */
  51 #include <vnet/fib/ip4_fib.h>
  52 #include <vnet/dpo/load_balance.h>
  53 #include <vnet/dpo/load_balance_map.h>
  54 #include <vnet/dpo/classify_dpo.h>
  55 #include <vnet/mfib/mfib_table.h>       /* for mFIB table and entry creation */
  56
  57 #include <vnet/ip/ip4_forward.h>
  58
  59 /** @brief IPv4 lookup node.
  60     @node ip4-lookup
  61
  62     This is the main IPv4 lookup dispatch node.
  63
  64     @param vm vlib_main_t corresponding to the current thread
  65     @param node vlib_node_runtime_t
  66     @param frame vlib_frame_t whose contents should be dispatched
  67
  68     @par Graph mechanics: buffer metadata, next index usage
  69
  70     @em Uses:
  71     - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
  72         - Indicates the @c sw_if_index value of the interface that the
  73           packet was received on.
  74     - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
  75         - When the value is @c ~0 then the node performs a longest prefix
  76           match (LPM) for the packet destination address in the FIB attached
  77           to the receive interface.
  78         - Otherwise perform LPM for the packet destination address in the
  79           indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
  80           value (0, 1, ...) and not a VRF id.
  81
  82     @em Sets:
  83     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
  84         - The lookup result adjacency index.
  85
  86     <em>Next Index:</em>
  87     - Dispatches the packet to the node index found in
  88       ip_adjacency_t @c adj->lookup_next_index
  89       (where @c adj is the lookup result adjacency).
  90 */
  91 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
  92                                 vlib_frame_t * frame)
  93 {
  94   return ip4_lookup_inline (vm, node, frame,
  95                             /* lookup_for_responses_to_locally_received_packets */
  96                             0);
  97
  98 }
  99
 100 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
 101
 102 /* *INDENT-OFF* */
 103 VLIB_REGISTER_NODE (ip4_lookup_node) =
 104 {
 105   .name = "ip4-lookup",
 106   .vector_size = sizeof (u32),
 107   .format_trace = format_ip4_lookup_trace,
 108   .n_next_nodes = IP_LOOKUP_N_NEXT,
 109   .next_nodes = IP4_LOOKUP_NEXT_NODES,
 110 };
 111 /* *INDENT-ON* */
 112
 113 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
 114                                       vlib_node_runtime_t * node,
 115                                       vlib_frame_t * frame)
 116 {
 117   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 118   u32 n_left_from, n_left_to_next, *from, *to_next;
 119   ip_lookup_next_t next;
 120   u32 thread_index = vm->thread_index;
 121
 122   from = vlib_frame_vector_args (frame);
 123   n_left_from = frame->n_vectors;
 124   next = node->cached_next_index;
 125
 126   if (node->flags & VLIB_NODE_FLAG_TRACE)
 127     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 128
 129   while (n_left_from > 0)
 130     {
 131       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 132
 133
 134       while (n_left_from >= 4 && n_left_to_next >= 2)
 135         {
 136           ip_lookup_next_t next0, next1;
 137           const load_balance_t *lb0, *lb1;
 138           vlib_buffer_t *p0, *p1;
 139           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 140           const ip4_header_t *ip0, *ip1;
 141           const dpo_id_t *dpo0, *dpo1;
 142
 143           /* Prefetch next iteration. */
 144           {
 145             vlib_buffer_t *p2, *p3;
 146
 147             p2 = vlib_get_buffer (vm, from[2]);
 148             p3 = vlib_get_buffer (vm, from[3]);
 149
 150             vlib_prefetch_buffer_header (p2, STORE);
 151             vlib_prefetch_buffer_header (p3, STORE);
 152
 153             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 154             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 155           }
 156
 157           pi0 = to_next[0] = from[0];
 158           pi1 = to_next[1] = from[1];
 159
 160           from += 2;
 161           n_left_from -= 2;
 162           to_next += 2;
 163           n_left_to_next -= 2;
 164
 165           p0 = vlib_get_buffer (vm, pi0);
 166           p1 = vlib_get_buffer (vm, pi1);
 167
 168           ip0 = vlib_buffer_get_current (p0);
 169           ip1 = vlib_buffer_get_current (p1);
 170           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 171           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 172
 173           lb0 = load_balance_get (lbi0);
 174           lb1 = load_balance_get (lbi1);
 175
 176           /*
 177            * this node is for via FIBs we can re-use the hash value from the
 178            * to node if present.
 179            * We don't want to use the same hash value at each level in the recursion
 180            * graph as that would lead to polarisation
 181            */
 182           hc0 = hc1 = 0;
 183
 184           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 185             {
 186               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 187                 {
 188                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 189                     vnet_buffer (p0)->ip.flow_hash >> 1;
 190                 }
 191               else
 192                 {
 193                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 194                     ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 195                 }
 196               dpo0 = load_balance_get_fwd_bucket
 197                 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 198             }
 199           else
 200             {
 201               dpo0 = load_balance_get_bucket_i (lb0, 0);
 202             }
 203           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 204             {
 205               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 206                 {
 207                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 208                     vnet_buffer (p1)->ip.flow_hash >> 1;
 209                 }
 210               else
 211                 {
 212                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 213                     ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
 214                 }
 215               dpo1 = load_balance_get_fwd_bucket
 216                 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 217             }
 218           else
 219             {
 220               dpo1 = load_balance_get_bucket_i (lb1, 0);
 221             }
 222
 223           next0 = dpo0->dpoi_next_node;
 224           next1 = dpo1->dpoi_next_node;
 225
 226           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 227           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 228
 229           vlib_increment_combined_counter
 230             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 231           vlib_increment_combined_counter
 232             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 233
 234           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 235                                            to_next, n_left_to_next,
 236                                            pi0, pi1, next0, next1);
 237         }
 238
 239       while (n_left_from > 0 && n_left_to_next > 0)
 240         {
 241           ip_lookup_next_t next0;
 242           const load_balance_t *lb0;
 243           vlib_buffer_t *p0;
 244           u32 pi0, lbi0, hc0;
 245           const ip4_header_t *ip0;
 246           const dpo_id_t *dpo0;
 247
 248           pi0 = from[0];
 249           to_next[0] = pi0;
 250           from += 1;
 251           to_next += 1;
 252           n_left_to_next -= 1;
 253           n_left_from -= 1;
 254
 255           p0 = vlib_get_buffer (vm, pi0);
 256
 257           ip0 = vlib_buffer_get_current (p0);
 258           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 259
 260           lb0 = load_balance_get (lbi0);
 261
 262           hc0 = 0;
 263           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 264             {
 265               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 266                 {
 267                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 268                     vnet_buffer (p0)->ip.flow_hash >> 1;
 269                 }
 270               else
 271                 {
 272                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 273                     ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 274                 }
 275               dpo0 = load_balance_get_fwd_bucket
 276                 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 277             }
 278           else
 279             {
 280               dpo0 = load_balance_get_bucket_i (lb0, 0);
 281             }
 282
 283           next0 = dpo0->dpoi_next_node;
 284           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 285
 286           vlib_increment_combined_counter
 287             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 288
 289           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 290                                            to_next, n_left_to_next,
 291                                            pi0, next0);
 292         }
 293
 294       vlib_put_next_frame (vm, node, next, n_left_to_next);
 295     }
 296
 297   return frame->n_vectors;
 298 }
 299
 300 /* *INDENT-OFF* */
 301 VLIB_REGISTER_NODE (ip4_load_balance_node) =
 302 {
 303   .name = "ip4-load-balance",
 304   .vector_size = sizeof (u32),
 305   .sibling_of = "ip4-lookup",
 306   .format_trace = format_ip4_lookup_trace,
 307 };
 308 /* *INDENT-ON* */
 309
 310 #ifndef CLIB_MARCH_VARIANT
 311 /* get first interface address */
 312 ip4_address_t *
 313 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
 314                              ip_interface_address_t ** result_ia)
 315 {
 316   ip_lookup_main_t *lm = &im->lookup_main;
 317   ip_interface_address_t *ia = 0;
 318   ip4_address_t *result = 0;
 319
 320   /* *INDENT-OFF* */
 321   foreach_ip_interface_address
 322     (lm, ia, sw_if_index,
 323      1 /* honor unnumbered */ ,
 324      ({
 325        ip4_address_t * a =
 326          ip_interface_address_get_address (lm, ia);
 327        result = a;
 328        break;
 329      }));
 330   /* *INDENT-OFF* */
 331   if (result_ia)
 332     *result_ia = result ? ia : 0;
 333   return result;
 334 }
 335
 336 static void
 337 ip4_add_subnet_bcast_route (u32 fib_index,
 338                             fib_prefix_t *pfx,
 339                             u32 sw_if_index)
 340 {
 341   vnet_sw_interface_flags_t iflags;
 342
 343   iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
 344
 345   fib_table_entry_special_remove(fib_index,
 346                                  pfx,
 347                                  FIB_SOURCE_INTERFACE);
 348
 349   if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
 350     {
 351       fib_table_entry_update_one_path (fib_index, pfx,
 352                                        FIB_SOURCE_INTERFACE,
 353                                        FIB_ENTRY_FLAG_NONE,
 354                                        DPO_PROTO_IP4,
 355                                        /* No next-hop address */
 356                                        &ADJ_BCAST_ADDR,
 357                                        sw_if_index,
 358                                        // invalid FIB index
 359                                        ~0,
 360                                        1,
 361                                        // no out-label stack
 362                                        NULL,
 363                                        FIB_ROUTE_PATH_FLAG_NONE);
 364     }
 365   else
 366     {
 367         fib_table_entry_special_add(fib_index,
 368                                     pfx,
 369                                     FIB_SOURCE_INTERFACE,
 370                                     (FIB_ENTRY_FLAG_DROP |
 371                                      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
 372     }
 373 }
 374
 375 static void
 376 ip4_add_interface_routes (u32 sw_if_index,
 377                           ip4_main_t * im, u32 fib_index,
 378                           ip_interface_address_t * a)
 379 {
 380   ip_lookup_main_t *lm = &im->lookup_main;
 381   ip4_address_t *address = ip_interface_address_get_address (lm, a);
 382   fib_prefix_t pfx = {
 383     .fp_len = a->address_length,
 384     .fp_proto = FIB_PROTOCOL_IP4,
 385     .fp_addr.ip4 = *address,
 386   };
 387
 388   if (pfx.fp_len <= 30)
 389     {
 390       /* a /30 or shorter - add a glean for the network address */
 391       fib_table_entry_update_one_path (fib_index, &pfx,
 392                                        FIB_SOURCE_INTERFACE,
 393                                        (FIB_ENTRY_FLAG_CONNECTED |
 394                                         FIB_ENTRY_FLAG_ATTACHED),
 395                                        DPO_PROTO_IP4,
 396                                        /* No next-hop address */
 397                                        NULL,
 398                                        sw_if_index,
 399                                        // invalid FIB index
 400                                        ~0,
 401                                        1,
 402                                        // no out-label stack
 403                                        NULL,
 404                                        FIB_ROUTE_PATH_FLAG_NONE);
 405
 406       /* Add the two broadcast addresses as drop */
 407       fib_prefix_t net_pfx = {
 408         .fp_len = 32,
 409         .fp_proto = FIB_PROTOCOL_IP4,
 410         .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
 411       };
 412       if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
 413         fib_table_entry_special_add(fib_index,
 414                                     &net_pfx,
 415                                     FIB_SOURCE_INTERFACE,
 416                                     (FIB_ENTRY_FLAG_DROP |
 417                                      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
 418       net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
 419       if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
 420         ip4_add_subnet_bcast_route(fib_index, &net_pfx, sw_if_index);
 421     }
 422   else if (pfx.fp_len == 31)
 423     {
 424       u32 mask = clib_host_to_net_u32(1);
 425       fib_prefix_t net_pfx = pfx;
 426
 427       net_pfx.fp_len = 32;
 428       net_pfx.fp_addr.ip4.as_u32 ^= mask;
 429
 430       /* a /31 - add the other end as an attached host */
 431       fib_table_entry_update_one_path (fib_index, &net_pfx,
 432                                        FIB_SOURCE_INTERFACE,
 433                                        (FIB_ENTRY_FLAG_ATTACHED),
 434                                        DPO_PROTO_IP4,
 435                                        &net_pfx.fp_addr,
 436                                        sw_if_index,
 437                                        // invalid FIB index
 438                                        ~0,
 439                                        1,
 440                                        NULL,
 441                                        FIB_ROUTE_PATH_FLAG_NONE);
 442     }
 443   pfx.fp_len = 32;
 444
 445   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 446     {
 447       u32 classify_table_index =
 448         lm->classify_table_index_by_sw_if_index[sw_if_index];
 449       if (classify_table_index != (u32) ~ 0)
 450         {
 451           dpo_id_t dpo = DPO_INVALID;
 452
 453           dpo_set (&dpo,
 454                    DPO_CLASSIFY,
 455                    DPO_PROTO_IP4,
 456                    classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
 457
 458           fib_table_entry_special_dpo_add (fib_index,
 459                                            &pfx,
 460                                            FIB_SOURCE_CLASSIFY,
 461                                            FIB_ENTRY_FLAG_NONE, &dpo);
 462           dpo_reset (&dpo);
 463         }
 464     }
 465
 466   fib_table_entry_update_one_path (fib_index, &pfx,
 467                                    FIB_SOURCE_INTERFACE,
 468                                    (FIB_ENTRY_FLAG_CONNECTED |
 469                                     FIB_ENTRY_FLAG_LOCAL),
 470                                    DPO_PROTO_IP4,
 471                                    &pfx.fp_addr,
 472                                    sw_if_index,
 473                                    // invalid FIB index
 474                                    ~0,
 475                                    1, NULL,
 476                                    FIB_ROUTE_PATH_FLAG_NONE);
 477 }
 478
 479 static void
 480 ip4_del_interface_routes (ip4_main_t * im,
 481                           u32 fib_index,
 482                           ip4_address_t * address, u32 address_length)
 483 {
 484   fib_prefix_t pfx = {
 485     .fp_len = address_length,
 486     .fp_proto = FIB_PROTOCOL_IP4,
 487     .fp_addr.ip4 = *address,
 488   };
 489
 490   if (pfx.fp_len <= 30)
 491     {
 492       fib_prefix_t net_pfx = {
 493         .fp_len = 32,
 494         .fp_proto = FIB_PROTOCOL_IP4,
 495         .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
 496       };
 497       if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
 498         fib_table_entry_special_remove(fib_index,
 499                                        &net_pfx,
 500                                        FIB_SOURCE_INTERFACE);
 501       net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
 502       if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
 503         fib_table_entry_special_remove(fib_index,
 504                                        &net_pfx,
 505                                        FIB_SOURCE_INTERFACE);
 506       fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 507     }
 508     else if (pfx.fp_len == 31)
 509     {
 510       u32 mask = clib_host_to_net_u32(1);
 511       fib_prefix_t net_pfx = pfx;
 512
 513       net_pfx.fp_len = 32;
 514       net_pfx.fp_addr.ip4.as_u32 ^= mask;
 515
 516       fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
 517     }
 518
 519   pfx.fp_len = 32;
 520   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 521 }
 522
 523 void
 524 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 525 {
 526   ip4_main_t *im = &ip4_main;
 527
 528   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 529
 530   /*
 531    * enable/disable only on the 1<->0 transition
 532    */
 533   if (is_enable)
 534     {
 535       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 536         return;
 537     }
 538   else
 539     {
 540       ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
 541       if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 542         return;
 543     }
 544   vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
 545                                !is_enable, 0, 0);
 546
 547
 548   vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
 549                                sw_if_index, !is_enable, 0, 0);
 550 }
 551
 552 static clib_error_t *
 553 ip4_add_del_interface_address_internal (vlib_main_t * vm,
 554                                         u32 sw_if_index,
 555                                         ip4_address_t * address,
 556                                         u32 address_length, u32 is_del)
 557 {
 558   vnet_main_t *vnm = vnet_get_main ();
 559   ip4_main_t *im = &ip4_main;
 560   ip_lookup_main_t *lm = &im->lookup_main;
 561   clib_error_t *error = 0;
 562   u32 if_address_index, elts_before;
 563   ip4_address_fib_t ip4_af, *addr_fib = 0;
 564
 565   /* local0 interface doesn't support IP addressing  */
 566   if (sw_if_index == 0)
 567     {
 568       return
 569        clib_error_create ("local0 interface doesn't support IP addressing");
 570     }
 571
 572   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 573   ip4_addr_fib_init (&ip4_af, address,
 574                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 575   vec_add1 (addr_fib, ip4_af);
 576
 577   /*
 578    * there is no support for adj-fib handling in the presence of overlapping
 579    * subnets on interfaces. Easy fix - disallow overlapping subnets, like
 580    * most routers do.
 581    */
 582   /* *INDENT-OFF* */
 583   if (!is_del)
 584     {
 585       /* When adding an address check that it does not conflict
 586          with an existing address on any interface in this table. */
 587       ip_interface_address_t *ia;
 588       vnet_sw_interface_t *sif;
 589
 590       pool_foreach(sif, vnm->interface_main.sw_interfaces,
 591       ({
 592           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 593               im->fib_index_by_sw_if_index[sif->sw_if_index])
 594             {
 595               foreach_ip_interface_address
 596                 (&im->lookup_main, ia, sif->sw_if_index,
 597                  0 /* honor unnumbered */ ,
 598                  ({
 599                    ip4_address_t * x =
 600                      ip_interface_address_get_address
 601                      (&im->lookup_main, ia);
 602                    if (ip4_destination_matches_route
 603                        (im, address, x, ia->address_length) ||
 604                        ip4_destination_matches_route (im,
 605                                                       x,
 606                                                       address,
 607                                                       address_length))
 608                      {
 609                        vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 610
 611                        return
 612                          clib_error_create
 613                          ("failed to add %U which conflicts with %U for interface %U",
 614                           format_ip4_address_and_length, address,
 615                           address_length,
 616                           format_ip4_address_and_length, x,
 617                           ia->address_length,
 618                           format_vnet_sw_if_index_name, vnm,
 619                           sif->sw_if_index);
 620                      }
 621                  }));
 622             }
 623       }));
 624     }
 625   /* *INDENT-ON* */
 626
 627   elts_before = pool_elts (lm->if_address_pool);
 628
 629   error = ip_interface_address_add_del
 630     (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
 631   if (error)
 632     goto done;
 633
 634   ip4_sw_interface_enable_disable (sw_if_index, !is_del);
 635
 636   if (is_del)
 637     ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
 638   else
 639     ip4_add_interface_routes (sw_if_index,
 640                               im, ip4_af.fib_index,
 641                               pool_elt_at_index
 642                               (lm->if_address_pool, if_address_index));
 643
 644   /* If pool did not grow/shrink: add duplicate address. */
 645   if (elts_before != pool_elts (lm->if_address_pool))
 646     {
 647       ip4_add_del_interface_address_callback_t *cb;
 648       vec_foreach (cb, im->add_del_interface_address_callbacks)
 649         cb->function (im, cb->function_opaque, sw_if_index,
 650                       address, address_length, if_address_index, is_del);
 651     }
 652
 653 done:
 654   vec_free (addr_fib);
 655   return error;
 656 }
 657
 658 clib_error_t *
 659 ip4_add_del_interface_address (vlib_main_t * vm,
 660                                u32 sw_if_index,
 661                                ip4_address_t * address,
 662                                u32 address_length, u32 is_del)
 663 {
 664   return ip4_add_del_interface_address_internal
 665     (vm, sw_if_index, address, address_length, is_del);
 666 }
 667
 668 void
 669 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
 670 {
 671   ip_interface_address_t *ia;
 672   ip4_main_t *im;
 673
 674   im = &ip4_main;
 675
 676   /*
 677    * when directed broadcast is enabled, the subnet braodcast route will forward
 678    * packets using an adjacency with a broadcast MAC. otherwise it drops
 679    */
 680   /* *INDENT-OFF* */
 681   foreach_ip_interface_address(&im->lookup_main, ia,
 682                                sw_if_index, 0,
 683      ({
 684        if (ia->address_length <= 30)
 685          {
 686            ip4_address_t *ipa;
 687
 688            ipa = ip_interface_address_get_address (&im->lookup_main, ia);
 689
 690            fib_prefix_t pfx = {
 691              .fp_len = 32,
 692              .fp_proto = FIB_PROTOCOL_IP4,
 693              .fp_addr = {
 694                .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
 695              },
 696            };
 697
 698            ip4_add_subnet_bcast_route
 699              (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
 700                                                   sw_if_index),
 701               &pfx, sw_if_index);
 702          }
 703      }));
 704   /* *INDENT-ON* */
 705 }
 706 #endif
 707
 708 /* Built-in ip4 unicast rx feature path definition */
 709 /* *INDENT-OFF* */
 710 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
 711 {
 712   .arc_name = "ip4-unicast",
 713   .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
 714   .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
 715 };
 716
 717 VNET_FEATURE_INIT (ip4_flow_classify, static) =
 718 {
 719   .arc_name = "ip4-unicast",
 720   .node_name = "ip4-flow-classify",
 721   .runs_before = VNET_FEATURES ("ip4-inacl"),
 722 };
 723
 724 VNET_FEATURE_INIT (ip4_inacl, static) =
 725 {
 726   .arc_name = "ip4-unicast",
 727   .node_name = "ip4-inacl",
 728   .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
 729 };
 730
 731 VNET_FEATURE_INIT (ip4_source_check_1, static) =
 732 {
 733   .arc_name = "ip4-unicast",
 734   .node_name = "ip4-source-check-via-rx",
 735   .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
 736 };
 737
 738 VNET_FEATURE_INIT (ip4_source_check_2, static) =
 739 {
 740   .arc_name = "ip4-unicast",
 741   .node_name = "ip4-source-check-via-any",
 742   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 743 };
 744
 745 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
 746 {
 747   .arc_name = "ip4-unicast",
 748   .node_name = "ip4-source-and-port-range-check-rx",
 749   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 750 };
 751
 752 VNET_FEATURE_INIT (ip4_policer_classify, static) =
 753 {
 754   .arc_name = "ip4-unicast",
 755   .node_name = "ip4-policer-classify",
 756   .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
 757 };
 758
 759 VNET_FEATURE_INIT (ip4_ipsec, static) =
 760 {
 761   .arc_name = "ip4-unicast",
 762   .node_name = "ipsec-input-ip4",
 763   .runs_before = VNET_FEATURES ("vpath-input-ip4"),
 764 };
 765
 766 VNET_FEATURE_INIT (ip4_vpath, static) =
 767 {
 768   .arc_name = "ip4-unicast",
 769   .node_name = "vpath-input-ip4",
 770   .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
 771 };
 772
 773 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
 774 {
 775   .arc_name = "ip4-unicast",
 776   .node_name = "ip4-vxlan-bypass",
 777   .runs_before = VNET_FEATURES ("ip4-lookup"),
 778 };
 779
 780 VNET_FEATURE_INIT (ip4_not_enabled, static) =
 781 {
 782   .arc_name = "ip4-unicast",
 783   .node_name = "ip4-not-enabled",
 784   .runs_before = VNET_FEATURES ("ip4-lookup"),
 785 };
 786
 787 VNET_FEATURE_INIT (ip4_lookup, static) =
 788 {
 789   .arc_name = "ip4-unicast",
 790   .node_name = "ip4-lookup",
 791   .runs_before = 0,     /* not before any other features */
 792 };
 793
 794 /* Built-in ip4 multicast rx feature path definition */
 795 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
 796 {
 797   .arc_name = "ip4-multicast",
 798   .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
 799   .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
 800 };
 801
 802 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
 803 {
 804   .arc_name = "ip4-multicast",
 805   .node_name = "vpath-input-ip4",
 806   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
 807 };
 808
 809 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
 810 {
 811   .arc_name = "ip4-multicast",
 812   .node_name = "ip4-not-enabled",
 813   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
 814 };
 815
 816 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
 817 {
 818   .arc_name = "ip4-multicast",
 819   .node_name = "ip4-mfib-forward-lookup",
 820   .runs_before = 0,     /* last feature */
 821 };
 822
 823 /* Source and port-range check ip4 tx feature path definition */
 824 VNET_FEATURE_ARC_INIT (ip4_output, static) =
 825 {
 826   .arc_name = "ip4-output",
 827   .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
 828   .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
 829 };
 830
 831 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
 832 {
 833   .arc_name = "ip4-output",
 834   .node_name = "ip4-source-and-port-range-check-tx",
 835   .runs_before = VNET_FEATURES ("ip4-outacl"),
 836 };
 837
 838 VNET_FEATURE_INIT (ip4_outacl, static) =
 839 {
 840   .arc_name = "ip4-output",
 841   .node_name = "ip4-outacl",
 842   .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
 843 };
 844
 845 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
 846 {
 847   .arc_name = "ip4-output",
 848   .node_name = "ipsec-output-ip4",
 849   .runs_before = VNET_FEATURES ("interface-output"),
 850 };
 851
 852 /* Built-in ip4 tx feature path definition */
 853 VNET_FEATURE_INIT (ip4_interface_output, static) =
 854 {
 855   .arc_name = "ip4-output",
 856   .node_name = "interface-output",
 857   .runs_before = 0,     /* not before any other features */
 858 };
 859 /* *INDENT-ON* */
 860
 861 static clib_error_t *
 862 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 863 {
 864   ip4_main_t *im = &ip4_main;
 865
 866   /* Fill in lookup tables with default table (0). */
 867   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 868   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 869
 870   if (!is_add)
 871     {
 872       ip4_main_t *im4 = &ip4_main;
 873       ip_lookup_main_t *lm4 = &im4->lookup_main;
 874       ip_interface_address_t *ia = 0;
 875       ip4_address_t *address;
 876       vlib_main_t *vm = vlib_get_main ();
 877
 878       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 879       /* *INDENT-OFF* */
 880       foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
 881       ({
 882         address = ip_interface_address_get_address (lm4, ia);
 883         ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 884       }));
 885       /* *INDENT-ON* */
 886     }
 887
 888   vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
 889                                is_add, 0, 0);
 890
 891   vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
 892                                sw_if_index, is_add, 0, 0);
 893
 894   return /* no error */ 0;
 895 }
 896
 897 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
 898
 899 /* Global IP4 main. */
 900 ip4_main_t ip4_main;
 901
 902 static clib_error_t *
 903 ip4_lookup_init (vlib_main_t * vm)
 904 {
 905   ip4_main_t *im = &ip4_main;
 906   clib_error_t *error;
 907   uword i;
 908
 909   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
 910     return error;
 911   if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
 912     return (error);
 913   if ((error = vlib_call_init_function (vm, fib_module_init)))
 914     return error;
 915   if ((error = vlib_call_init_function (vm, mfib_module_init)))
 916     return error;
 917
 918   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
 919     {
 920       u32 m;
 921
 922       if (i < 32)
 923         m = pow2_mask (i) << (32 - i);
 924       else
 925         m = ~0;
 926       im->fib_masks[i] = clib_host_to_net_u32 (m);
 927     }
 928
 929   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
 930
 931   /* Create FIB with index 0 and table id of 0. */
 932   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
 933                                      FIB_SOURCE_DEFAULT_ROUTE);
 934   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
 935                                       MFIB_SOURCE_DEFAULT_ROUTE);
 936
 937   {
 938     pg_node_t *pn;
 939     pn = pg_get_node (ip4_lookup_node.index);
 940     pn->unformat_edit = unformat_pg_ip4_header;
 941   }
 942
 943   {
 944     ethernet_arp_header_t h;
 945
 946     memset (&h, 0, sizeof (h));
 947
 948     /* Set target ethernet address to all zeros. */
 949     memset (h.ip4_over_ethernet[1].ethernet, 0,
 950             sizeof (h.ip4_over_ethernet[1].ethernet));
 951
 952 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
 953 #define _8(f,v) h.f = v;
 954     _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
 955     _16 (l3_type, ETHERNET_TYPE_IP4);
 956     _8 (n_l2_address_bytes, 6);
 957     _8 (n_l3_address_bytes, 4);
 958     _16 (opcode, ETHERNET_ARP_OPCODE_request);
 959 #undef _16
 960 #undef _8
 961
 962     vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
 963                                /* data */ &h,
 964                                sizeof (h),
 965                                /* alloc chunk size */ 8,
 966                                "ip4 arp");
 967   }
 968
 969   return error;
 970 }
 971
 972 VLIB_INIT_FUNCTION (ip4_lookup_init);
 973
 974 typedef struct
 975 {
 976   /* Adjacency taken. */
 977   u32 dpo_index;
 978   u32 flow_hash;
 979   u32 fib_index;
 980
 981   /* Packet data, possibly *after* rewrite. */
 982   u8 packet_data[64 - 1 * sizeof (u32)];
 983 }
 984 ip4_forward_next_trace_t;
 985
 986 #ifndef CLIB_MARCH_VARIANT
 987 u8 *
 988 format_ip4_forward_next_trace (u8 * s, va_list * args)
 989 {
 990   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 991   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 992   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
 993   u32 indent = format_get_indent (s);
 994   s = format (s, "%U%U",
 995               format_white_space, indent,
 996               format_ip4_header, t->packet_data, sizeof (t->packet_data));
 997   return s;
 998 }
 999 #endif
1000
1001 static u8 *
1002 format_ip4_lookup_trace (u8 * s, va_list * args)
1003 {
1004   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1005   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1006   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1007   u32 indent = format_get_indent (s);
1008
1009   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1010               t->fib_index, t->dpo_index, t->flow_hash);
1011   s = format (s, "\n%U%U",
1012               format_white_space, indent,
1013               format_ip4_header, t->packet_data, sizeof (t->packet_data));
1014   return s;
1015 }
1016
1017 static u8 *
1018 format_ip4_rewrite_trace (u8 * s, va_list * args)
1019 {
1020   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1021   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1022   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1023   u32 indent = format_get_indent (s);
1024
1025   s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1026               t->fib_index, t->dpo_index, format_ip_adjacency,
1027               t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1028   s = format (s, "\n%U%U",
1029               format_white_space, indent,
1030               format_ip_adjacency_packet_data,
1031               t->dpo_index, t->packet_data, sizeof (t->packet_data));
1032   return s;
1033 }
1034
1035 #ifndef CLIB_MARCH_VARIANT
1036 /* Common trace function for all ip4-forward next nodes. */
1037 void
1038 ip4_forward_next_trace (vlib_main_t * vm,
1039                         vlib_node_runtime_t * node,
1040                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1041 {
1042   u32 *from, n_left;
1043   ip4_main_t *im = &ip4_main;
1044
1045   n_left = frame->n_vectors;
1046   from = vlib_frame_vector_args (frame);
1047
1048   while (n_left >= 4)
1049     {
1050       u32 bi0, bi1;
1051       vlib_buffer_t *b0, *b1;
1052       ip4_forward_next_trace_t *t0, *t1;
1053
1054       /* Prefetch next iteration. */
1055       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1056       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1057
1058       bi0 = from[0];
1059       bi1 = from[1];
1060
1061       b0 = vlib_get_buffer (vm, bi0);
1062       b1 = vlib_get_buffer (vm, bi1);
1063
1064       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1065         {
1066           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1067           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1068           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1069           t0->fib_index =
1070             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1071              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1072             vec_elt (im->fib_index_by_sw_if_index,
1073                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1074
1075           clib_memcpy (t0->packet_data,
1076                        vlib_buffer_get_current (b0),
1077                        sizeof (t0->packet_data));
1078         }
1079       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1080         {
1081           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1082           t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1083           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1084           t1->fib_index =
1085             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1086              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1087             vec_elt (im->fib_index_by_sw_if_index,
1088                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1089           clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1090                        sizeof (t1->packet_data));
1091         }
1092       from += 2;
1093       n_left -= 2;
1094     }
1095
1096   while (n_left >= 1)
1097     {
1098       u32 bi0;
1099       vlib_buffer_t *b0;
1100       ip4_forward_next_trace_t *t0;
1101
1102       bi0 = from[0];
1103
1104       b0 = vlib_get_buffer (vm, bi0);
1105
1106       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1107         {
1108           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1109           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1110           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1111           t0->fib_index =
1112             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1113              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1114             vec_elt (im->fib_index_by_sw_if_index,
1115                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1116           clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1117                        sizeof (t0->packet_data));
1118         }
1119       from += 1;
1120       n_left -= 1;
1121     }
1122 }
1123
1124 /* Compute TCP/UDP/ICMP4 checksum in software. */
1125 u16
1126 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1127                               ip4_header_t * ip0)
1128 {
1129   ip_csum_t sum0;
1130   u32 ip_header_length, payload_length_host_byte_order;
1131   u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1132   u16 sum16;
1133   void *data_this_buffer;
1134
1135   /* Initialize checksum with ip header. */
1136   ip_header_length = ip4_header_bytes (ip0);
1137   payload_length_host_byte_order =
1138     clib_net_to_host_u16 (ip0->length) - ip_header_length;
1139   sum0 =
1140     clib_host_to_net_u32 (payload_length_host_byte_order +
1141                           (ip0->protocol << 16));
1142
1143   if (BITS (uword) == 32)
1144     {
1145       sum0 =
1146         ip_csum_with_carry (sum0,
1147                             clib_mem_unaligned (&ip0->src_address, u32));
1148       sum0 =
1149         ip_csum_with_carry (sum0,
1150                             clib_mem_unaligned (&ip0->dst_address, u32));
1151     }
1152   else
1153     sum0 =
1154       ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1155
1156   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1157   data_this_buffer = (void *) ip0 + ip_header_length;
1158   n_ip_bytes_this_buffer =
1159     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1160   if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1161     {
1162       n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1163         n_ip_bytes_this_buffer - ip_header_length : 0;
1164     }
1165   while (1)
1166     {
1167       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1168       n_bytes_left -= n_this_buffer;
1169       if (n_bytes_left == 0)
1170         break;
1171
1172       ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1173       p0 = vlib_get_buffer (vm, p0->next_buffer);
1174       data_this_buffer = vlib_buffer_get_current (p0);
1175       n_this_buffer = p0->current_length;
1176     }
1177
1178   sum16 = ~ip_csum_fold (sum0);
1179
1180   return sum16;
1181 }
1182
1183 u32
1184 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1185 {
1186   ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1187   udp_header_t *udp0;
1188   u16 sum16;
1189
1190   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1191           || ip0->protocol == IP_PROTOCOL_UDP);
1192
1193   udp0 = (void *) (ip0 + 1);
1194   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1195     {
1196       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1197                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1198       return p0->flags;
1199     }
1200
1201   sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1202
1203   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1204                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1205
1206   return p0->flags;
1207 }
1208 #endif
1209
1210 /* *INDENT-OFF* */
1211 VNET_FEATURE_ARC_INIT (ip4_local) =
1212 {
1213   .arc_name  = "ip4-local",
1214   .start_nodes = VNET_FEATURES ("ip4-local"),
1215 };
1216 /* *INDENT-ON* */
1217
1218 static inline void
1219 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1220                             ip4_header_t * ip, u8 is_udp, u8 * error,
1221                             u8 * good_tcp_udp)
1222 {
1223   u32 flags0;
1224   flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1225   *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1226   if (is_udp)
1227     {
1228       udp_header_t *udp;
1229       u32 ip_len, udp_len;
1230       i32 len_diff;
1231       udp = ip4_next_header (ip);
1232       /* Verify UDP length. */
1233       ip_len = clib_net_to_host_u16 (ip->length);
1234       udp_len = clib_net_to_host_u16 (udp->length);
1235
1236       len_diff = ip_len - udp_len;
1237       *good_tcp_udp &= len_diff >= 0;
1238       *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1239     }
1240 }
1241
1242 #define ip4_local_csum_is_offloaded(_b)                                 \
1243     _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM                         \
1244         || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1245
1246 #define ip4_local_need_csum_check(is_tcp_udp, _b)                       \
1247     (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED     \
1248         || ip4_local_csum_is_offloaded (_b)))
1249
1250 #define ip4_local_csum_is_valid(_b)                                     \
1251     (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT                      \
1252         || (ip4_local_csum_is_offloaded (_b))) != 0
1253
1254 static inline void
1255 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1256                          ip4_header_t * ih, u8 * error)
1257 {
1258   u8 is_udp, is_tcp_udp, good_tcp_udp;
1259
1260   is_udp = ih->protocol == IP_PROTOCOL_UDP;
1261   is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1262
1263   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1264     ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1265   else
1266     good_tcp_udp = ip4_local_csum_is_valid (b);
1267
1268   ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1269   *error = (is_tcp_udp && !good_tcp_udp
1270             ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1271 }
1272
1273 static inline void
1274 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1275                             ip4_header_t ** ih, u8 * error)
1276 {
1277   u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1278
1279   is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1280   is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1281
1282   is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1283   is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1284
1285   good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1286   good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1287
1288   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1289                      || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1290     {
1291       if (is_tcp_udp[0])
1292         ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1293                                     &good_tcp_udp[0]);
1294       if (is_tcp_udp[1])
1295         ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1296                                     &good_tcp_udp[1]);
1297     }
1298
1299   error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1300               IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1301   error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1302               IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1303 }
1304
1305 static inline void
1306 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1307                               vlib_buffer_t * b, u16 * next, u8 error,
1308                               u8 head_of_feature_arc)
1309 {
1310   u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1311   u32 next_index;
1312
1313   *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1314   b->error = error ? error_node->errors[error] : 0;
1315   if (head_of_feature_arc)
1316     {
1317       next_index = *next;
1318       if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1319         {
1320           vnet_feature_arc_start (arc_index,
1321                                   vnet_buffer (b)->sw_if_index[VLIB_RX],
1322                                   &next_index, b);
1323           *next = next_index;
1324         }
1325     }
1326 }
1327
1328 typedef struct
1329 {
1330   ip4_address_t src;
1331   u32 lbi;
1332   u8 error;
1333 } ip4_local_last_check_t;
1334
1335 static inline void
1336 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1337                      ip4_local_last_check_t * last_check, u8 * error0)
1338 {
1339   ip4_fib_mtrie_leaf_t leaf0;
1340   ip4_fib_mtrie_t *mtrie0;
1341   const dpo_id_t *dpo0;
1342   load_balance_t *lb0;
1343   u32 lbi0;
1344
1345   vnet_buffer (b)->ip.fib_index =
1346     vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1347     vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1348
1349   if (PREDICT_FALSE (last_check->src.as_u32 != ip0->src_address.as_u32))
1350     {
1351       mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1352       leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1353       leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1354       leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1355       lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1356
1357       vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1358       vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0;
1359
1360       lb0 = load_balance_get (lbi0);
1361       dpo0 = load_balance_get_bucket_i (lb0, 0);
1362
1363       /*
1364        * Must have a route to source otherwise we drop the packet.
1365        * ip4 broadcasts are accepted, e.g. to make dhcp client work
1366        *
1367        * The checks are:
1368        *  - the source is a recieve => it's from us => bogus, do this
1369        *    first since it sets a different error code.
1370        *  - uRPF check for any route to source - accept if passes.
1371        *  - allow packets destined to the broadcast address from unknown sources
1372        */
1373
1374       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1375                   && dpo0->dpoi_type == DPO_RECEIVE) ?
1376                  IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1377       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1378                   && !fib_urpf_check_size (lb0->lb_urpf)
1379                   && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1380                  IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1381
1382       last_check->src.as_u32 = ip0->src_address.as_u32;
1383       last_check->lbi = lbi0;
1384       last_check->error = *error0;
1385     }
1386   else
1387     {
1388       vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1389       vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi;
1390       *error0 = last_check->error;
1391     }
1392 }
1393
1394 static inline void
1395 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1396                         ip4_local_last_check_t * last_check, u8 * error)
1397 {
1398   ip4_fib_mtrie_leaf_t leaf[2];
1399   ip4_fib_mtrie_t *mtrie[2];
1400   const dpo_id_t *dpo[2];
1401   load_balance_t *lb[2];
1402   u32 not_last_hit = 0;
1403   u32 lbi[2];
1404
1405   not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1406   not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1407
1408   vnet_buffer (b[0])->ip.fib_index =
1409     vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1410     vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1411     vnet_buffer (b[0])->ip.fib_index;
1412
1413   vnet_buffer (b[1])->ip.fib_index =
1414     vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1415     vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1416     vnet_buffer (b[1])->ip.fib_index;
1417
1418   if (PREDICT_FALSE (not_last_hit))
1419     {
1420       mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1421       mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1422
1423       leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1424       leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1425
1426       leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1427                                            &ip[0]->src_address, 2);
1428       leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1429                                            &ip[1]->src_address, 2);
1430
1431       leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1432                                            &ip[0]->src_address, 3);
1433       leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1434                                            &ip[1]->src_address, 3);
1435
1436       lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1437       lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1438
1439       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1440       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0];
1441
1442       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1443       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1];
1444
1445       lb[0] = load_balance_get (lbi[0]);
1446       lb[1] = load_balance_get (lbi[1]);
1447
1448       dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1449       dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1450
1451       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1452                    dpo[0]->dpoi_type == DPO_RECEIVE) ?
1453                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1454       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1455                    !fib_urpf_check_size (lb[0]->lb_urpf) &&
1456                    ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1457                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1458
1459       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1460                    dpo[1]->dpoi_type == DPO_RECEIVE) ?
1461                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1462       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1463                    !fib_urpf_check_size (lb[1]->lb_urpf) &&
1464                    ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1465                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1466
1467       last_check->src.as_u32 = ip[1]->src_address.as_u32;
1468       last_check->lbi = lbi[1];
1469       last_check->error = error[1];
1470     }
1471   else
1472     {
1473       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1474       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi;
1475
1476       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1477       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi;
1478
1479       error[0] = last_check->error;
1480       error[1] = last_check->error;
1481     }
1482 }
1483
1484 static inline uword
1485 ip4_local_inline (vlib_main_t * vm,
1486                   vlib_node_runtime_t * node,
1487                   vlib_frame_t * frame, int head_of_feature_arc)
1488 {
1489   ip4_main_t *im = &ip4_main;
1490   ip_lookup_main_t *lm = &im->lookup_main;
1491   u32 *from, n_left_from;
1492   vlib_node_runtime_t *error_node =
1493     vlib_node_get_runtime (vm, ip4_input_node.index);
1494   u16 nexts[VLIB_FRAME_SIZE], *next;
1495   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1496   ip4_header_t *ip[2];
1497   u8 error[2];
1498
1499   ip4_local_last_check_t last_check = {
1500     .src = {.as_u32 = 0},
1501     .lbi = ~0,
1502     .error = IP4_ERROR_UNKNOWN_PROTOCOL
1503   };
1504
1505   from = vlib_frame_vector_args (frame);
1506   n_left_from = frame->n_vectors;
1507
1508   if (node->flags & VLIB_NODE_FLAG_TRACE)
1509     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1510
1511   vlib_get_buffers (vm, from, bufs, n_left_from);
1512   b = bufs;
1513   next = nexts;
1514
1515   while (n_left_from >= 6)
1516     {
1517       u32 is_nat, not_batch = 0;
1518
1519       /* Prefetch next iteration. */
1520       {
1521         vlib_prefetch_buffer_header (b[4], LOAD);
1522         vlib_prefetch_buffer_header (b[5], LOAD);
1523
1524         CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1525         CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1526       }
1527
1528       error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1529
1530       ip[0] = vlib_buffer_get_current (b[0]);
1531       ip[1] = vlib_buffer_get_current (b[1]);
1532
1533       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1534       vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1535
1536       is_nat = b[0]->flags & VNET_BUFFER_F_IS_NATED;
1537       not_batch |= is_nat ^ (b[1]->flags & VNET_BUFFER_F_IS_NATED);
1538
1539       if (head_of_feature_arc == 0 || (is_nat && not_batch == 0))
1540         goto skip_checks;
1541
1542       if (PREDICT_TRUE (not_batch == 0))
1543         {
1544           ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1545           ip4_local_check_src_x2 (b, ip, &last_check, error);
1546         }
1547       else
1548         {
1549           if (!(b[0]->flags & VNET_BUFFER_F_IS_NATED))
1550             {
1551               ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1552               ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1553             }
1554           if (!(b[1]->flags & VNET_BUFFER_F_IS_NATED))
1555             {
1556               ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1557               ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1558             }
1559         }
1560
1561     skip_checks:
1562
1563       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1564       next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1565       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1566                                     head_of_feature_arc);
1567       ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1568                                     head_of_feature_arc);
1569
1570       b += 2;
1571       next += 2;
1572       n_left_from -= 2;
1573     }
1574
1575   while (n_left_from > 0)
1576     {
1577       error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1578
1579       ip[0] = vlib_buffer_get_current (b[0]);
1580       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1581
1582       if (head_of_feature_arc == 0 || (b[0]->flags & VNET_BUFFER_F_IS_NATED))
1583         goto skip_check;
1584
1585       ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1586       ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1587
1588     skip_check:
1589
1590       next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1591       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1592                                     head_of_feature_arc);
1593
1594       b += 1;
1595       next += 1;
1596       n_left_from -= 1;
1597     }
1598
1599   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1600   return frame->n_vectors;
1601 }
1602
1603 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1604                                vlib_frame_t * frame)
1605 {
1606   return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1607 }
1608
1609 /* *INDENT-OFF* */
1610 VLIB_REGISTER_NODE (ip4_local_node) =
1611 {
1612   .name = "ip4-local",
1613   .vector_size = sizeof (u32),
1614   .format_trace = format_ip4_forward_next_trace,
1615   .n_next_nodes = IP_LOCAL_N_NEXT,
1616   .next_nodes =
1617   {
1618     [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1619     [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1620     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1621     [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1622   },
1623 };
1624 /* *INDENT-ON* */
1625
1626
1627 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1628                                           vlib_node_runtime_t * node,
1629                                           vlib_frame_t * frame)
1630 {
1631   return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1632 }
1633
1634 /* *INDENT-OFF* */
1635 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1636   .name = "ip4-local-end-of-arc",
1637   .vector_size = sizeof (u32),
1638
1639   .format_trace = format_ip4_forward_next_trace,
1640   .sibling_of = "ip4-local",
1641 };
1642
1643 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1644   .arc_name = "ip4-local",
1645   .node_name = "ip4-local-end-of-arc",
1646   .runs_before = 0, /* not before any other features */
1647 };
1648 /* *INDENT-ON* */
1649
1650 #ifndef CLIB_MARCH_VARIANT
1651 void
1652 ip4_register_protocol (u32 protocol, u32 node_index)
1653 {
1654   vlib_main_t *vm = vlib_get_main ();
1655   ip4_main_t *im = &ip4_main;
1656   ip_lookup_main_t *lm = &im->lookup_main;
1657
1658   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1659   lm->local_next_by_ip_protocol[protocol] =
1660     vlib_node_add_next (vm, ip4_local_node.index, node_index);
1661 }
1662 #endif
1663
1664 static clib_error_t *
1665 show_ip_local_command_fn (vlib_main_t * vm,
1666                           unformat_input_t * input, vlib_cli_command_t * cmd)
1667 {
1668   ip4_main_t *im = &ip4_main;
1669   ip_lookup_main_t *lm = &im->lookup_main;
1670   int i;
1671
1672   vlib_cli_output (vm, "Protocols handled by ip4_local");
1673   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1674     {
1675       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1676         {
1677           u32 node_index = vlib_get_node (vm,
1678                                           ip4_local_node.index)->
1679             next_nodes[lm->local_next_by_ip_protocol[i]];
1680           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1681                            node_index);
1682         }
1683     }
1684   return 0;
1685 }
1686
1687
1688
1689 /*?
1690  * Display the set of protocols handled by the local IPv4 stack.
1691  *
1692  * @cliexpar
1693  * Example of how to display local protocol table:
1694  * @cliexstart{show ip local}
1695  * Protocols handled by ip4_local
1696  * 1
1697  * 17
1698  * 47
1699  * @cliexend
1700 ?*/
1701 /* *INDENT-OFF* */
1702 VLIB_CLI_COMMAND (show_ip_local, static) =
1703 {
1704   .path = "show ip local",
1705   .function = show_ip_local_command_fn,
1706   .short_help = "show ip local",
1707 };
1708 /* *INDENT-ON* */
1709
1710 always_inline uword
1711 ip4_arp_inline (vlib_main_t * vm,
1712                 vlib_node_runtime_t * node,
1713                 vlib_frame_t * frame, int is_glean)
1714 {
1715   vnet_main_t *vnm = vnet_get_main ();
1716   ip4_main_t *im = &ip4_main;
1717   ip_lookup_main_t *lm = &im->lookup_main;
1718   u32 *from, *to_next_drop;
1719   uword n_left_from, n_left_to_next_drop, next_index;
1720   u32 thread_index = vm->thread_index;
1721   u32 seed;
1722
1723   if (node->flags & VLIB_NODE_FLAG_TRACE)
1724     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1725
1726   seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
1727
1728   from = vlib_frame_vector_args (frame);
1729   n_left_from = frame->n_vectors;
1730   next_index = node->cached_next_index;
1731   if (next_index == IP4_ARP_NEXT_DROP)
1732     next_index = IP4_ARP_N_NEXT;        /* point to first interface */
1733
1734   while (n_left_from > 0)
1735     {
1736       vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1737                            to_next_drop, n_left_to_next_drop);
1738
1739       while (n_left_from > 0 && n_left_to_next_drop > 0)
1740         {
1741           u32 pi0, adj_index0, r0, sw_if_index0, drop0;
1742           ip_adjacency_t *adj0;
1743           vlib_buffer_t *p0;
1744           ip4_header_t *ip0;
1745
1746           pi0 = from[0];
1747
1748           p0 = vlib_get_buffer (vm, pi0);
1749
1750           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1751           adj0 = adj_get (adj_index0);
1752           ip0 = vlib_buffer_get_current (p0);
1753
1754           sw_if_index0 = adj0->rewrite_header.sw_if_index;
1755           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1756
1757           if (PREDICT_TRUE (is_glean))
1758             {
1759               /*
1760                * this is the Glean case, so we are ARPing for the
1761                * packet's destination
1762                */
1763               r0 = ip0->dst_address.data_u32;
1764             }
1765           else
1766             {
1767               r0 = adj0->sub_type.nbr.next_hop.ip4.data_u32;
1768             }
1769
1770           drop0 = throttle_check (&im->arp_throttle, thread_index, r0, seed);
1771
1772           from += 1;
1773           n_left_from -= 1;
1774           to_next_drop[0] = pi0;
1775           to_next_drop += 1;
1776           n_left_to_next_drop -= 1;
1777
1778           p0->error =
1779             node->errors[drop0 ? IP4_ARP_ERROR_DROP :
1780                          IP4_ARP_ERROR_REQUEST_SENT];
1781
1782           /*
1783            * the adj has been updated to a rewrite but the node the DPO that got
1784            * us here hasn't - yet. no big deal. we'll drop while we wait.
1785            */
1786           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1787             continue;
1788
1789           if (drop0)
1790             continue;
1791
1792           /*
1793            * Can happen if the control-plane is programming tables
1794            * with traffic flowing; at least that's today's lame excuse.
1795            */
1796           if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1797               || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1798             {
1799               p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1800             }
1801           else
1802             /* Send ARP request. */
1803             {
1804               u32 bi0 = 0;
1805               vlib_buffer_t *b0;
1806               ethernet_arp_header_t *h0;
1807               vnet_hw_interface_t *hw_if0;
1808
1809               h0 =
1810                 vlib_packet_template_get_packet (vm,
1811                                                  &im->ip4_arp_request_packet_template,
1812                                                  &bi0);
1813
1814               /* Seems we're out of buffers */
1815               if (PREDICT_FALSE (!h0))
1816                 continue;
1817
1818               /* Add rewrite/encap string for ARP packet. */
1819               vnet_rewrite_one_header (adj0[0], h0,
1820                                        sizeof (ethernet_header_t));
1821
1822               hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1823
1824               /* Src ethernet address in ARP header. */
1825               clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
1826                            hw_if0->hw_address,
1827                            sizeof (h0->ip4_over_ethernet[0].ethernet));
1828
1829               if (is_glean)
1830                 {
1831                   /* The interface's source address is stashed in the Glean Adj */
1832                   h0->ip4_over_ethernet[0].ip4 =
1833                     adj0->sub_type.glean.receive_addr.ip4;
1834
1835                   /* Copy in destination address we are requesting. This is the
1836                    * glean case, so it's the packet's destination.*/
1837                   h0->ip4_over_ethernet[1].ip4.data_u32 =
1838                     ip0->dst_address.data_u32;
1839                 }
1840               else
1841                 {
1842                   /* Src IP address in ARP header. */
1843                   if (ip4_src_address_for_packet (lm, sw_if_index0,
1844                                                   &h0->
1845                                                   ip4_over_ethernet[0].ip4))
1846                     {
1847                       /* No source address available */
1848                       p0->error =
1849                         node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1850                       vlib_buffer_free (vm, &bi0, 1);
1851                       continue;
1852                     }
1853
1854                   /* Copy in destination address we are requesting from the
1855                      incomplete adj */
1856                   h0->ip4_over_ethernet[1].ip4.data_u32 =
1857                     adj0->sub_type.nbr.next_hop.ip4.as_u32;
1858                 }
1859
1860               vlib_buffer_copy_trace_flag (vm, p0, bi0);
1861               b0 = vlib_get_buffer (vm, bi0);
1862               VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1863               vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1864
1865               vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1866
1867               vlib_set_next_frame_buffer (vm, node,
1868                                           adj0->rewrite_header.next_index,
1869                                           bi0);
1870             }
1871         }
1872
1873       vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1874     }
1875
1876   return frame->n_vectors;
1877 }
1878
1879 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1880                              vlib_frame_t * frame)
1881 {
1882   return (ip4_arp_inline (vm, node, frame, 0));
1883 }
1884
1885 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1886                                vlib_frame_t * frame)
1887 {
1888   return (ip4_arp_inline (vm, node, frame, 1));
1889 }
1890
1891 static char *ip4_arp_error_strings[] = {
1892   [IP4_ARP_ERROR_DROP] = "address overflow drops",
1893   [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1894   [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1895   [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
1896   [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
1897   [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1898 };
1899
1900 /* *INDENT-OFF* */
1901 VLIB_REGISTER_NODE (ip4_arp_node) =
1902 {
1903   .name = "ip4-arp",
1904   .vector_size = sizeof (u32),
1905   .format_trace = format_ip4_forward_next_trace,
1906   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1907   .error_strings = ip4_arp_error_strings,
1908   .n_next_nodes = IP4_ARP_N_NEXT,
1909   .next_nodes =
1910   {
1911     [IP4_ARP_NEXT_DROP] = "error-drop",
1912   },
1913 };
1914
1915 VLIB_REGISTER_NODE (ip4_glean_node) =
1916 {
1917   .name = "ip4-glean",
1918   .vector_size = sizeof (u32),
1919   .format_trace = format_ip4_forward_next_trace,
1920   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1921   .error_strings = ip4_arp_error_strings,
1922   .n_next_nodes = IP4_ARP_N_NEXT,
1923   .next_nodes = {
1924   [IP4_ARP_NEXT_DROP] = "error-drop",
1925   },
1926 };
1927 /* *INDENT-ON* */
1928
1929 #define foreach_notrace_ip4_arp_error           \
1930 _(DROP)                                         \
1931 _(REQUEST_SENT)                                 \
1932 _(REPLICATE_DROP)                               \
1933 _(REPLICATE_FAIL)
1934
1935 static clib_error_t *
1936 arp_notrace_init (vlib_main_t * vm)
1937 {
1938   vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1939
1940   /* don't trace ARP request packets */
1941 #define _(a)                                    \
1942     vnet_pcap_drop_trace_filter_add_del         \
1943         (rt->errors[IP4_ARP_ERROR_##a],         \
1944          1 /* is_add */);
1945   foreach_notrace_ip4_arp_error;
1946 #undef _
1947   return 0;
1948 }
1949
1950 VLIB_INIT_FUNCTION (arp_notrace_init);
1951
1952
1953 #ifndef CLIB_MARCH_VARIANT
1954 /* Send an ARP request to see if given destination is reachable on given interface. */
1955 clib_error_t *
1956 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1957                     u8 refresh)
1958 {
1959   vnet_main_t *vnm = vnet_get_main ();
1960   ip4_main_t *im = &ip4_main;
1961   ethernet_arp_header_t *h;
1962   ip4_address_t *src;
1963   ip_interface_address_t *ia;
1964   ip_adjacency_t *adj;
1965   vnet_hw_interface_t *hi;
1966   vnet_sw_interface_t *si;
1967   vlib_buffer_t *b;
1968   adj_index_t ai;
1969   u32 bi = 0;
1970   u8 unicast_rewrite = 0;
1971
1972   si = vnet_get_sw_interface (vnm, sw_if_index);
1973
1974   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1975     {
1976       return clib_error_return (0, "%U: interface %U down",
1977                                 format_ip4_address, dst,
1978                                 format_vnet_sw_if_index_name, vnm,
1979                                 sw_if_index);
1980     }
1981
1982   src =
1983     ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1984   if (!src)
1985     {
1986       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1987       return clib_error_return
1988         (0,
1989          "no matching interface address for destination %U (interface %U)",
1990          format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
1991          sw_if_index);
1992     }
1993
1994   h = vlib_packet_template_get_packet (vm,
1995                                        &im->ip4_arp_request_packet_template,
1996                                        &bi);
1997
1998   if (!h)
1999     return clib_error_return (0, "ARP request packet allocation failed");
2000
2001   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2002   if (PREDICT_FALSE (!hi->hw_address))
2003     {
2004       return clib_error_return (0, "%U: interface %U do not support ip probe",
2005                                 format_ip4_address, dst,
2006                                 format_vnet_sw_if_index_name, vnm,
2007                                 sw_if_index);
2008     }
2009
2010   clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2011                sizeof (h->ip4_over_ethernet[0].ethernet));
2012
2013   h->ip4_over_ethernet[0].ip4 = src[0];
2014   h->ip4_over_ethernet[1].ip4 = dst[0];
2015
2016   b = vlib_get_buffer (vm, bi);
2017   vnet_buffer (b)->sw_if_index[VLIB_RX] =
2018     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2019
2020   ip46_address_t nh = {
2021     .ip4 = *dst,
2022   };
2023
2024   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2025                             VNET_LINK_IP4, &nh, sw_if_index);
2026   adj = adj_get (ai);
2027
2028   /* Peer has been previously resolved, retrieve glean adj instead */
2029   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2030     {
2031       if (refresh)
2032         unicast_rewrite = 1;
2033       else
2034         {
2035           adj_unlock (ai);
2036           ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
2037                                       VNET_LINK_IP4, sw_if_index, &nh);
2038           adj = adj_get (ai);
2039         }
2040     }
2041
2042   /* Add encapsulation string for software interface (e.g. ethernet header). */
2043   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2044   if (unicast_rewrite)
2045     {
2046       u16 *etype = vlib_buffer_get_current (b) - 2;
2047       etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2048     }
2049   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2050
2051   {
2052     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2053     u32 *to_next = vlib_frame_vector_args (f);
2054     to_next[0] = bi;
2055     f->n_vectors = 1;
2056     vlib_put_frame_to_node (vm, hi->output_node_index, f);
2057   }
2058
2059   adj_unlock (ai);
2060   return /* no error */ 0;
2061 }
2062 #endif
2063
2064 typedef enum
2065 {
2066   IP4_REWRITE_NEXT_DROP,
2067   IP4_REWRITE_NEXT_ICMP_ERROR,
2068   IP4_REWRITE_NEXT_FRAGMENT,
2069   IP4_REWRITE_N_NEXT            /* Last */
2070 } ip4_rewrite_next_t;
2071
2072 /**
2073  * This bits of an IPv4 address to mask to construct a multicast
2074  * MAC address
2075  */
2076 #if CLIB_ARCH_IS_BIG_ENDIAN
2077 #define IP4_MCAST_ADDR_MASK 0x007fffff
2078 #else
2079 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2080 #endif
2081
2082 always_inline void
2083 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2084                u16 adj_packet_bytes, bool df, u16 * next, u32 * error)
2085 {
2086   if (packet_len > adj_packet_bytes)
2087     {
2088       *error = IP4_ERROR_MTU_EXCEEDED;
2089       if (df)
2090         {
2091           icmp4_error_set_vnet_buffer
2092             (b, ICMP4_destination_unreachable,
2093              ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2094              adj_packet_bytes);
2095           *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2096         }
2097       else
2098         {
2099           /* IP fragmentation */
2100           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2101                                    IP4_FRAG_NEXT_IP4_REWRITE, 0);
2102           *next = IP4_REWRITE_NEXT_FRAGMENT;
2103         }
2104     }
2105 }
2106
2107 /* Decrement TTL & update checksum.
2108    Works either endian, so no need for byte swap. */
2109 static_always_inline void
2110 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2111                             u32 * error)
2112 {
2113   i32 ttl;
2114   u32 checksum;
2115   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2116     {
2117       b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2118       return;
2119     }
2120
2121   ttl = ip->ttl;
2122
2123   /* Input node should have reject packets with ttl 0. */
2124   ASSERT (ip->ttl > 0);
2125
2126   checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2127   checksum += checksum >= 0xffff;
2128
2129   ip->checksum = checksum;
2130   ttl -= 1;
2131   ip->ttl = ttl;
2132
2133   /*
2134    * If the ttl drops below 1 when forwarding, generate
2135    * an ICMP response.
2136    */
2137   if (PREDICT_FALSE (ttl <= 0))
2138     {
2139       *error = IP4_ERROR_TIME_EXPIRED;
2140       vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2141       icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2142                                    ICMP4_time_exceeded_ttl_exceeded_in_transit,
2143                                    0);
2144       *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2145     }
2146
2147   /* Verify checksum. */
2148   ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2149           (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2150 }
2151
2152
2153 always_inline uword
2154 ip4_rewrite_inline (vlib_main_t * vm,
2155                     vlib_node_runtime_t * node,
2156                     vlib_frame_t * frame,
2157                     int do_counters, int is_midchain, int is_mcast)
2158 {
2159   ip_lookup_main_t *lm = &ip4_main.lookup_main;
2160   u32 *from = vlib_frame_vector_args (frame);
2161   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2162   u16 nexts[VLIB_FRAME_SIZE], *next;
2163   u32 n_left_from;
2164   vlib_node_runtime_t *error_node =
2165     vlib_node_get_runtime (vm, ip4_input_node.index);
2166
2167   n_left_from = frame->n_vectors;
2168   u32 thread_index = vm->thread_index;
2169
2170   vlib_get_buffers (vm, from, bufs, n_left_from);
2171   clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2172
2173   if (n_left_from >= 6)
2174     {
2175       int i;
2176       for (i = 0; i < 6; i++)
2177         vlib_prefetch_buffer_header (bufs[i], LOAD);
2178     }
2179
2180   next = nexts;
2181   b = bufs;
2182   while (n_left_from >= 8)
2183     {
2184       ip_adjacency_t *adj0, *adj1;
2185       ip4_header_t *ip0, *ip1;
2186       u32 rw_len0, error0, adj_index0;
2187       u32 rw_len1, error1, adj_index1;
2188       u32 tx_sw_if_index0, tx_sw_if_index1;
2189       u8 *p;
2190
2191       vlib_prefetch_buffer_header (b[6], LOAD);
2192       vlib_prefetch_buffer_header (b[7], LOAD);
2193
2194       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2195       adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2196
2197       /*
2198        * pre-fetch the per-adjacency counters
2199        */
2200       if (do_counters)
2201         {
2202           vlib_prefetch_combined_counter (&adjacency_counters,
2203                                           thread_index, adj_index0);
2204           vlib_prefetch_combined_counter (&adjacency_counters,
2205                                           thread_index, adj_index1);
2206         }
2207
2208       ip0 = vlib_buffer_get_current (b[0]);
2209       ip1 = vlib_buffer_get_current (b[1]);
2210
2211       error0 = error1 = IP4_ERROR_NONE;
2212
2213       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2214       ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2215
2216       /* Rewrite packet header and updates lengths. */
2217       adj0 = adj_get (adj_index0);
2218       adj1 = adj_get (adj_index1);
2219
2220       /* Worth pipelining. No guarantee that adj0,1 are hot... */
2221       rw_len0 = adj0[0].rewrite_header.data_bytes;
2222       rw_len1 = adj1[0].rewrite_header.data_bytes;
2223       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2224       vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2225
2226       p = vlib_buffer_get_current (b[2]);
2227       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2228       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2229
2230       p = vlib_buffer_get_current (b[3]);
2231       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2232       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2233
2234       /* Check MTU of outgoing interface. */
2235       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2236                      adj0[0].rewrite_header.max_l3_packet_bytes,
2237                      ip0->flags_and_fragment_offset &
2238                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2239                      next + 0, &error0);
2240       ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
2241                      adj1[0].rewrite_header.max_l3_packet_bytes,
2242                      ip1->flags_and_fragment_offset &
2243                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2244                      next + 1, &error1);
2245
2246       if (is_mcast)
2247         {
2248           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2249                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2250                     IP4_ERROR_SAME_INTERFACE : error0);
2251           error1 = ((adj1[0].rewrite_header.sw_if_index ==
2252                      vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2253                     IP4_ERROR_SAME_INTERFACE : error1);
2254         }
2255
2256       b[0]->error = error_node->errors[error0];
2257       b[1]->error = error_node->errors[error1];
2258       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2259        * to see the IP headerr */
2260       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2261         {
2262           u32 next_index = adj0[0].rewrite_header.next_index;
2263           b[0]->current_data -= rw_len0;
2264           b[0]->current_length += rw_len0;
2265           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2266           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2267
2268           if (PREDICT_FALSE
2269               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2270             vnet_feature_arc_start (lm->output_feature_arc_index,
2271                                     tx_sw_if_index0, &next_index, b[0]);
2272           next[0] = next_index;
2273         }
2274       if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2275         {
2276           u32 next_index = adj1[0].rewrite_header.next_index;
2277           b[1]->current_data -= rw_len1;
2278           b[1]->current_length += rw_len1;
2279
2280           tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2281           vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2282
2283           if (PREDICT_FALSE
2284               (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2285             vnet_feature_arc_start (lm->output_feature_arc_index,
2286                                     tx_sw_if_index1, &next_index, b[1]);
2287           next[1] = next_index;
2288         }
2289
2290       /* Guess we are only writing on simple Ethernet header. */
2291       vnet_rewrite_two_headers (adj0[0], adj1[0],
2292                                 ip0, ip1, sizeof (ethernet_header_t));
2293
2294       /*
2295        * Bump the per-adjacency counters
2296        */
2297       if (do_counters)
2298         {
2299           vlib_increment_combined_counter
2300             (&adjacency_counters,
2301              thread_index,
2302              adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2303
2304           vlib_increment_combined_counter
2305             (&adjacency_counters,
2306              thread_index,
2307              adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2308         }
2309
2310       if (is_midchain)
2311         {
2312           adj0->sub_type.midchain.fixup_func
2313             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2314           adj1->sub_type.midchain.fixup_func
2315             (vm, adj1, b[1], adj0->sub_type.midchain.fixup_data);
2316         }
2317
2318       if (is_mcast)
2319         {
2320           /*
2321            * copy bytes from the IP address into the MAC rewrite
2322            */
2323           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2324                                       adj0->rewrite_header.dst_mcast_offset,
2325                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2326           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2327                                       adj0->rewrite_header.dst_mcast_offset,
2328                                       &ip1->dst_address.as_u32, (u8 *) ip1);
2329         }
2330
2331       next += 2;
2332       b += 2;
2333       n_left_from -= 2;
2334     }
2335
2336   while (n_left_from > 0)
2337     {
2338       ip_adjacency_t *adj0;
2339       ip4_header_t *ip0;
2340       u32 rw_len0, adj_index0, error0;
2341       u32 tx_sw_if_index0;
2342
2343       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2344
2345       adj0 = adj_get (adj_index0);
2346
2347       if (do_counters)
2348         vlib_prefetch_combined_counter (&adjacency_counters,
2349                                         thread_index, adj_index0);
2350
2351       ip0 = vlib_buffer_get_current (b[0]);
2352
2353       error0 = IP4_ERROR_NONE;
2354
2355       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2356
2357
2358       /* Update packet buffer attributes/set output interface. */
2359       rw_len0 = adj0[0].rewrite_header.data_bytes;
2360       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2361
2362       /* Check MTU of outgoing interface. */
2363       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2364                      adj0[0].rewrite_header.max_l3_packet_bytes,
2365                      ip0->flags_and_fragment_offset &
2366                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2367                      next + 0, &error0);
2368
2369       if (is_mcast)
2370         {
2371           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2372                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2373                     IP4_ERROR_SAME_INTERFACE : error0);
2374         }
2375       b[0]->error = error_node->errors[error0];
2376
2377       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2378        * to see the IP headerr */
2379       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2380         {
2381           u32 next_index = adj0[0].rewrite_header.next_index;
2382           b[0]->current_data -= rw_len0;
2383           b[0]->current_length += rw_len0;
2384           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2385           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2386
2387           if (PREDICT_FALSE
2388               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2389             vnet_feature_arc_start (lm->output_feature_arc_index,
2390                                     tx_sw_if_index0, &next_index, b[0]);
2391           next[0] = next_index;
2392         }
2393
2394       /* Guess we are only writing on simple Ethernet header. */
2395       vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2396
2397       if (do_counters)
2398         vlib_increment_combined_counter
2399           (&adjacency_counters,
2400            thread_index, adj_index0, 1,
2401            vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2402
2403       if (is_midchain)
2404         {
2405           adj0->sub_type.midchain.fixup_func
2406             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2407         }
2408
2409       if (is_mcast)
2410         {
2411           /*
2412            * copy bytes from the IP address into the MAC rewrite
2413            */
2414           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2415                                       adj0->rewrite_header.dst_mcast_offset,
2416                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2417         }
2418
2419       next += 1;
2420       b += 1;
2421       n_left_from -= 1;
2422     }
2423
2424
2425   /* Need to do trace after rewrites to pick up new packet data. */
2426   if (node->flags & VLIB_NODE_FLAG_TRACE)
2427     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2428
2429   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2430   return frame->n_vectors;
2431 }
2432
2433
2434 /** @brief IPv4 rewrite node.
2435     @node ip4-rewrite
2436
2437     This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2438     header checksum, fetch the ip adjacency, check the outbound mtu,
2439     apply the adjacency rewrite, and send pkts to the adjacency
2440     rewrite header's rewrite_next_index.
2441
2442     @param vm vlib_main_t corresponding to the current thread
2443     @param node vlib_node_runtime_t
2444     @param frame vlib_frame_t whose contents should be dispatched
2445
2446     @par Graph mechanics: buffer metadata, next index usage
2447
2448     @em Uses:
2449     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2450         - the rewrite adjacency index
2451     - <code>adj->lookup_next_index</code>
2452         - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2453           the packet will be dropped.
2454     - <code>adj->rewrite_header</code>
2455         - Rewrite string length, rewrite string, next_index
2456
2457     @em Sets:
2458     - <code>b->current_data, b->current_length</code>
2459         - Updated net of applying the rewrite string
2460
2461     <em>Next Indices:</em>
2462     - <code> adj->rewrite_header.next_index </code>
2463       or @c ip4-drop
2464 */
2465
2466 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2467                                  vlib_frame_t * frame)
2468 {
2469   if (adj_are_counters_enabled ())
2470     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2471   else
2472     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2473 }
2474
2475 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2476                                        vlib_node_runtime_t * node,
2477                                        vlib_frame_t * frame)
2478 {
2479   if (adj_are_counters_enabled ())
2480     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2481   else
2482     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2483 }
2484
2485 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2486                                   vlib_node_runtime_t * node,
2487                                   vlib_frame_t * frame)
2488 {
2489   if (adj_are_counters_enabled ())
2490     return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2491   else
2492     return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2493 }
2494
2495 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2496                                        vlib_node_runtime_t * node,
2497                                        vlib_frame_t * frame)
2498 {
2499   if (adj_are_counters_enabled ())
2500     return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2501   else
2502     return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2503 }
2504
2505 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2506                                         vlib_node_runtime_t * node,
2507                                         vlib_frame_t * frame)
2508 {
2509   if (adj_are_counters_enabled ())
2510     return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2511   else
2512     return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2513 }
2514
2515 /* *INDENT-OFF* */
2516 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2517   .name = "ip4-rewrite",
2518   .vector_size = sizeof (u32),
2519
2520   .format_trace = format_ip4_rewrite_trace,
2521
2522   .n_next_nodes = IP4_REWRITE_N_NEXT,
2523   .next_nodes = {
2524     [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2525     [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2526     [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2527   },
2528 };
2529
2530 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2531   .name = "ip4-rewrite-bcast",
2532   .vector_size = sizeof (u32),
2533
2534   .format_trace = format_ip4_rewrite_trace,
2535   .sibling_of = "ip4-rewrite",
2536 };
2537
2538 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2539   .name = "ip4-rewrite-mcast",
2540   .vector_size = sizeof (u32),
2541
2542   .format_trace = format_ip4_rewrite_trace,
2543   .sibling_of = "ip4-rewrite",
2544 };
2545
2546 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2547   .name = "ip4-mcast-midchain",
2548   .vector_size = sizeof (u32),
2549
2550   .format_trace = format_ip4_rewrite_trace,
2551   .sibling_of = "ip4-rewrite",
2552 };
2553
2554 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2555   .name = "ip4-midchain",
2556   .vector_size = sizeof (u32),
2557   .format_trace = format_ip4_forward_next_trace,
2558   .sibling_of =  "ip4-rewrite",
2559 };
2560 /* *INDENT-ON */
2561
2562 static int
2563 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2564 {
2565   ip4_fib_mtrie_t *mtrie0;
2566   ip4_fib_mtrie_leaf_t leaf0;
2567   u32 lbi0;
2568
2569   mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2570
2571   leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2572   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2573   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2574
2575   lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2576
2577   return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2578 }
2579
2580 static clib_error_t *
2581 test_lookup_command_fn (vlib_main_t * vm,
2582                         unformat_input_t * input, vlib_cli_command_t * cmd)
2583 {
2584   ip4_fib_t *fib;
2585   u32 table_id = 0;
2586   f64 count = 1;
2587   u32 n;
2588   int i;
2589   ip4_address_t ip4_base_address;
2590   u64 errors = 0;
2591
2592   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2593     {
2594       if (unformat (input, "table %d", &table_id))
2595         {
2596           /* Make sure the entry exists. */
2597           fib = ip4_fib_get (table_id);
2598           if ((fib) && (fib->index != table_id))
2599             return clib_error_return (0, "<fib-index> %d does not exist",
2600                                       table_id);
2601         }
2602       else if (unformat (input, "count %f", &count))
2603         ;
2604
2605       else if (unformat (input, "%U",
2606                          unformat_ip4_address, &ip4_base_address))
2607         ;
2608       else
2609         return clib_error_return (0, "unknown input `%U'",
2610                                   format_unformat_error, input);
2611     }
2612
2613   n = count;
2614
2615   for (i = 0; i < n; i++)
2616     {
2617       if (!ip4_lookup_validate (&ip4_base_address, table_id))
2618         errors++;
2619
2620       ip4_base_address.as_u32 =
2621         clib_host_to_net_u32 (1 +
2622                               clib_net_to_host_u32 (ip4_base_address.as_u32));
2623     }
2624
2625   if (errors)
2626     vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2627   else
2628     vlib_cli_output (vm, "No errors in %d lookups\n", n);
2629
2630   return 0;
2631 }
2632
2633 /*?
2634  * Perform a lookup of an IPv4 Address (or range of addresses) in the
2635  * given FIB table to determine if there is a conflict with the
2636  * adjacency table. The fib-id can be determined by using the
2637  * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2638  * of 0 is used.
2639  *
2640  * @todo This command uses fib-id, other commands use table-id (not
2641  * just a name, they are different indexes). Would like to change this
2642  * to table-id for consistency.
2643  *
2644  * @cliexpar
2645  * Example of how to run the test lookup command:
2646  * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2647  * No errors in 2 lookups
2648  * @cliexend
2649 ?*/
2650 /* *INDENT-OFF* */
2651 VLIB_CLI_COMMAND (lookup_test_command, static) =
2652 {
2653   .path = "test lookup",
2654   .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2655   .function = test_lookup_command_fn,
2656 };
2657 /* *INDENT-ON* */
2658
2659 #ifndef CLIB_MARCH_VARIANT
2660 int
2661 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2662 {
2663   u32 fib_index;
2664
2665   fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2666
2667   if (~0 == fib_index)
2668     return VNET_API_ERROR_NO_SUCH_FIB;
2669
2670   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2671                                   flow_hash_config);
2672
2673   return 0;
2674 }
2675 #endif
2676
2677 static clib_error_t *
2678 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2679                              unformat_input_t * input,
2680                              vlib_cli_command_t * cmd)
2681 {
2682   int matched = 0;
2683   u32 table_id = 0;
2684   u32 flow_hash_config = 0;
2685   int rv;
2686
2687   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2688     {
2689       if (unformat (input, "table %d", &table_id))
2690         matched = 1;
2691 #define _(a,v) \
2692     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2693       foreach_flow_hash_bit
2694 #undef _
2695         else
2696         break;
2697     }
2698
2699   if (matched == 0)
2700     return clib_error_return (0, "unknown input `%U'",
2701                               format_unformat_error, input);
2702
2703   rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2704   switch (rv)
2705     {
2706     case 0:
2707       break;
2708
2709     case VNET_API_ERROR_NO_SUCH_FIB:
2710       return clib_error_return (0, "no such FIB table %d", table_id);
2711
2712     default:
2713       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2714       break;
2715     }
2716
2717   return 0;
2718 }
2719
2720 /*?
2721  * Configure the set of IPv4 fields used by the flow hash.
2722  *
2723  * @cliexpar
2724  * Example of how to set the flow hash on a given table:
2725  * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2726  * Example of display the configured flow hash:
2727  * @cliexstart{show ip fib}
2728  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2729  * 0.0.0.0/0
2730  *   unicast-ip4-chain
2731  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2732  *     [0] [@0]: dpo-drop ip6
2733  * 0.0.0.0/32
2734  *   unicast-ip4-chain
2735  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2736  *     [0] [@0]: dpo-drop ip6
2737  * 224.0.0.0/8
2738  *   unicast-ip4-chain
2739  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2740  *     [0] [@0]: dpo-drop ip6
2741  * 6.0.1.2/32
2742  *   unicast-ip4-chain
2743  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2744  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2745  * 7.0.0.1/32
2746  *   unicast-ip4-chain
2747  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2748  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2749  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2750  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2751  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2752  * 240.0.0.0/8
2753  *   unicast-ip4-chain
2754  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2755  *     [0] [@0]: dpo-drop ip6
2756  * 255.255.255.255/32
2757  *   unicast-ip4-chain
2758  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2759  *     [0] [@0]: dpo-drop ip6
2760  * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2761  * 0.0.0.0/0
2762  *   unicast-ip4-chain
2763  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2764  *     [0] [@0]: dpo-drop ip6
2765  * 0.0.0.0/32
2766  *   unicast-ip4-chain
2767  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2768  *     [0] [@0]: dpo-drop ip6
2769  * 172.16.1.0/24
2770  *   unicast-ip4-chain
2771  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2772  *     [0] [@4]: ipv4-glean: af_packet0
2773  * 172.16.1.1/32
2774  *   unicast-ip4-chain
2775  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2776  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2777  * 172.16.1.2/32
2778  *   unicast-ip4-chain
2779  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2780  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2781  * 172.16.2.0/24
2782  *   unicast-ip4-chain
2783  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2784  *     [0] [@4]: ipv4-glean: af_packet1
2785  * 172.16.2.1/32
2786  *   unicast-ip4-chain
2787  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2788  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2789  * 224.0.0.0/8
2790  *   unicast-ip4-chain
2791  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2792  *     [0] [@0]: dpo-drop ip6
2793  * 240.0.0.0/8
2794  *   unicast-ip4-chain
2795  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2796  *     [0] [@0]: dpo-drop ip6
2797  * 255.255.255.255/32
2798  *   unicast-ip4-chain
2799  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2800  *     [0] [@0]: dpo-drop ip6
2801  * @cliexend
2802 ?*/
2803 /* *INDENT-OFF* */
2804 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2805 {
2806   .path = "set ip flow-hash",
2807   .short_help =
2808   "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2809   .function = set_ip_flow_hash_command_fn,
2810 };
2811 /* *INDENT-ON* */
2812
2813 #ifndef CLIB_MARCH_VARIANT
2814 int
2815 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2816                              u32 table_index)
2817 {
2818   vnet_main_t *vnm = vnet_get_main ();
2819   vnet_interface_main_t *im = &vnm->interface_main;
2820   ip4_main_t *ipm = &ip4_main;
2821   ip_lookup_main_t *lm = &ipm->lookup_main;
2822   vnet_classify_main_t *cm = &vnet_classify_main;
2823   ip4_address_t *if_addr;
2824
2825   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2826     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2827
2828   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2829     return VNET_API_ERROR_NO_SUCH_ENTRY;
2830
2831   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2832   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2833
2834   if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2835
2836   if (NULL != if_addr)
2837     {
2838       fib_prefix_t pfx = {
2839         .fp_len = 32,
2840         .fp_proto = FIB_PROTOCOL_IP4,
2841         .fp_addr.ip4 = *if_addr,
2842       };
2843       u32 fib_index;
2844
2845       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2846                                                        sw_if_index);
2847
2848
2849       if (table_index != (u32) ~ 0)
2850         {
2851           dpo_id_t dpo = DPO_INVALID;
2852
2853           dpo_set (&dpo,
2854                    DPO_CLASSIFY,
2855                    DPO_PROTO_IP4,
2856                    classify_dpo_create (DPO_PROTO_IP4, table_index));
2857
2858           fib_table_entry_special_dpo_add (fib_index,
2859                                            &pfx,
2860                                            FIB_SOURCE_CLASSIFY,
2861                                            FIB_ENTRY_FLAG_NONE, &dpo);
2862           dpo_reset (&dpo);
2863         }
2864       else
2865         {
2866           fib_table_entry_special_remove (fib_index,
2867                                           &pfx, FIB_SOURCE_CLASSIFY);
2868         }
2869     }
2870
2871   return 0;
2872 }
2873 #endif
2874
2875 static clib_error_t *
2876 set_ip_classify_command_fn (vlib_main_t * vm,
2877                             unformat_input_t * input,
2878                             vlib_cli_command_t * cmd)
2879 {
2880   u32 table_index = ~0;
2881   int table_index_set = 0;
2882   u32 sw_if_index = ~0;
2883   int rv;
2884
2885   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2886     {
2887       if (unformat (input, "table-index %d", &table_index))
2888         table_index_set = 1;
2889       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2890                          vnet_get_main (), &sw_if_index))
2891         ;
2892       else
2893         break;
2894     }
2895
2896   if (table_index_set == 0)
2897     return clib_error_return (0, "classify table-index must be specified");
2898
2899   if (sw_if_index == ~0)
2900     return clib_error_return (0, "interface / subif must be specified");
2901
2902   rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2903
2904   switch (rv)
2905     {
2906     case 0:
2907       break;
2908
2909     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2910       return clib_error_return (0, "No such interface");
2911
2912     case VNET_API_ERROR_NO_SUCH_ENTRY:
2913       return clib_error_return (0, "No such classifier table");
2914     }
2915   return 0;
2916 }
2917
2918 /*?
2919  * Assign a classification table to an interface. The classification
2920  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2921  * commands. Once the table is create, use this command to filter packets
2922  * on an interface.
2923  *
2924  * @cliexpar
2925  * Example of how to assign a classification table to an interface:
2926  * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2927 ?*/
2928 /* *INDENT-OFF* */
2929 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2930 {
2931     .path = "set ip classify",
2932     .short_help =
2933     "set ip classify intfc <interface> table-index <classify-idx>",
2934     .function = set_ip_classify_command_fn,
2935 };
2936 /* *INDENT-ON* */
2937
2938 static clib_error_t *
2939 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2940 {
2941   ip4_main_t *im = &ip4_main;
2942   uword heapsize = 0;
2943
2944   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2945     {
2946       if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2947         ;
2948       else
2949         return clib_error_return (0,
2950                                   "invalid heap-size parameter `%U'",
2951                                   format_unformat_error, input);
2952     }
2953
2954   im->mtrie_heap_size = heapsize;
2955
2956   return 0;
2957 }
2958
2959 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2960
2961 /*
2962  * fd.io coding-style-patch-verification: ON
2963  *
2964  * Local Variables:
2965  * eval: (c-set-style "gnu")
2966  * End:
2967  */