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   f64 time_now;
1723
1724   if (node->flags & VLIB_NODE_FLAG_TRACE)
1725     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1726
1727   time_now = vlib_time_now (vm);
1728   if (time_now - im->arp_throttle_last_seed_change_time[thread_index] > 1e-3)
1729     {
1730       (void) random_u32 (&im->arp_throttle_seeds[thread_index]);
1731       memset (im->arp_throttle_bitmaps[thread_index], 0,
1732               ARP_THROTTLE_BITS / BITS (u8));
1733
1734       im->arp_throttle_last_seed_change_time[thread_index] = time_now;
1735     }
1736   seed = im->arp_throttle_seeds[thread_index];
1737
1738   from = vlib_frame_vector_args (frame);
1739   n_left_from = frame->n_vectors;
1740   next_index = node->cached_next_index;
1741   if (next_index == IP4_ARP_NEXT_DROP)
1742     next_index = IP4_ARP_N_NEXT;        /* point to first interface */
1743
1744   while (n_left_from > 0)
1745     {
1746       vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1747                            to_next_drop, n_left_to_next_drop);
1748
1749       while (n_left_from > 0 && n_left_to_next_drop > 0)
1750         {
1751           u32 pi0, adj_index0, r0, w0, sw_if_index0, drop0;
1752           uword m0;
1753           ip_adjacency_t *adj0;
1754           vlib_buffer_t *p0;
1755           ip4_header_t *ip0;
1756
1757           pi0 = from[0];
1758
1759           p0 = vlib_get_buffer (vm, pi0);
1760
1761           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1762           adj0 = adj_get (adj_index0);
1763           ip0 = vlib_buffer_get_current (p0);
1764
1765           sw_if_index0 = adj0->rewrite_header.sw_if_index;
1766           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1767
1768           if (PREDICT_TRUE (is_glean))
1769             {
1770               /*
1771                * this is the Glean case, so we are ARPing for the
1772                * packet's destination
1773                */
1774               r0 = ip0->dst_address.data_u32;
1775             }
1776           else
1777             {
1778               r0 = adj0->sub_type.nbr.next_hop.ip4.data_u32;
1779             }
1780
1781           r0 ^= seed;
1782           /* Select bit number */
1783           r0 &= ARP_THROTTLE_BITS - 1;
1784           w0 = r0 / BITS (uword);
1785           m0 = (uword) 1 << (r0 % BITS (uword));
1786
1787           drop0 = (im->arp_throttle_bitmaps[thread_index][w0] & m0) != 0;
1788           im->arp_throttle_bitmaps[thread_index][w0] |= m0;
1789
1790           from += 1;
1791           n_left_from -= 1;
1792           to_next_drop[0] = pi0;
1793           to_next_drop += 1;
1794           n_left_to_next_drop -= 1;
1795
1796           p0->error =
1797             node->errors[drop0 ? IP4_ARP_ERROR_DROP :
1798                          IP4_ARP_ERROR_REQUEST_SENT];
1799
1800           /*
1801            * the adj has been updated to a rewrite but the node the DPO that got
1802            * us here hasn't - yet. no big deal. we'll drop while we wait.
1803            */
1804           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1805             continue;
1806
1807           if (drop0)
1808             continue;
1809
1810           /*
1811            * Can happen if the control-plane is programming tables
1812            * with traffic flowing; at least that's today's lame excuse.
1813            */
1814           if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1815               || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1816             {
1817               p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1818             }
1819           else
1820             /* Send ARP request. */
1821             {
1822               u32 bi0 = 0;
1823               vlib_buffer_t *b0;
1824               ethernet_arp_header_t *h0;
1825               vnet_hw_interface_t *hw_if0;
1826
1827               h0 =
1828                 vlib_packet_template_get_packet (vm,
1829                                                  &im->ip4_arp_request_packet_template,
1830                                                  &bi0);
1831
1832               /* Seems we're out of buffers */
1833               if (PREDICT_FALSE (!h0))
1834                 continue;
1835
1836               /* Add rewrite/encap string for ARP packet. */
1837               vnet_rewrite_one_header (adj0[0], h0,
1838                                        sizeof (ethernet_header_t));
1839
1840               hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1841
1842               /* Src ethernet address in ARP header. */
1843               clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
1844                            hw_if0->hw_address,
1845                            sizeof (h0->ip4_over_ethernet[0].ethernet));
1846
1847               if (is_glean)
1848                 {
1849                   /* The interface's source address is stashed in the Glean Adj */
1850                   h0->ip4_over_ethernet[0].ip4 =
1851                     adj0->sub_type.glean.receive_addr.ip4;
1852
1853                   /* Copy in destination address we are requesting. This is the
1854                    * glean case, so it's the packet's destination.*/
1855                   h0->ip4_over_ethernet[1].ip4.data_u32 =
1856                     ip0->dst_address.data_u32;
1857                 }
1858               else
1859                 {
1860                   /* Src IP address in ARP header. */
1861                   if (ip4_src_address_for_packet (lm, sw_if_index0,
1862                                                   &h0->
1863                                                   ip4_over_ethernet[0].ip4))
1864                     {
1865                       /* No source address available */
1866                       p0->error =
1867                         node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1868                       vlib_buffer_free (vm, &bi0, 1);
1869                       continue;
1870                     }
1871
1872                   /* Copy in destination address we are requesting from the
1873                      incomplete adj */
1874                   h0->ip4_over_ethernet[1].ip4.data_u32 =
1875                     adj0->sub_type.nbr.next_hop.ip4.as_u32;
1876                 }
1877
1878               vlib_buffer_copy_trace_flag (vm, p0, bi0);
1879               b0 = vlib_get_buffer (vm, bi0);
1880               VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1881               vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1882
1883               vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1884
1885               vlib_set_next_frame_buffer (vm, node,
1886                                           adj0->rewrite_header.next_index,
1887                                           bi0);
1888             }
1889         }
1890
1891       vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1892     }
1893
1894   return frame->n_vectors;
1895 }
1896
1897 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1898                              vlib_frame_t * frame)
1899 {
1900   return (ip4_arp_inline (vm, node, frame, 0));
1901 }
1902
1903 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1904                                vlib_frame_t * frame)
1905 {
1906   return (ip4_arp_inline (vm, node, frame, 1));
1907 }
1908
1909 static char *ip4_arp_error_strings[] = {
1910   [IP4_ARP_ERROR_DROP] = "address overflow drops",
1911   [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1912   [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1913   [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
1914   [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
1915   [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1916 };
1917
1918 /* *INDENT-OFF* */
1919 VLIB_REGISTER_NODE (ip4_arp_node) =
1920 {
1921   .name = "ip4-arp",
1922   .vector_size = sizeof (u32),
1923   .format_trace = format_ip4_forward_next_trace,
1924   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1925   .error_strings = ip4_arp_error_strings,
1926   .n_next_nodes = IP4_ARP_N_NEXT,
1927   .next_nodes =
1928   {
1929     [IP4_ARP_NEXT_DROP] = "error-drop",
1930   },
1931 };
1932
1933 VLIB_REGISTER_NODE (ip4_glean_node) =
1934 {
1935   .name = "ip4-glean",
1936   .vector_size = sizeof (u32),
1937   .format_trace = format_ip4_forward_next_trace,
1938   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1939   .error_strings = ip4_arp_error_strings,
1940   .n_next_nodes = IP4_ARP_N_NEXT,
1941   .next_nodes = {
1942   [IP4_ARP_NEXT_DROP] = "error-drop",
1943   },
1944 };
1945 /* *INDENT-ON* */
1946
1947 #define foreach_notrace_ip4_arp_error           \
1948 _(DROP)                                         \
1949 _(REQUEST_SENT)                                 \
1950 _(REPLICATE_DROP)                               \
1951 _(REPLICATE_FAIL)
1952
1953 static clib_error_t *
1954 arp_notrace_init (vlib_main_t * vm)
1955 {
1956   vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1957
1958   /* don't trace ARP request packets */
1959 #define _(a)                                    \
1960     vnet_pcap_drop_trace_filter_add_del         \
1961         (rt->errors[IP4_ARP_ERROR_##a],         \
1962          1 /* is_add */);
1963   foreach_notrace_ip4_arp_error;
1964 #undef _
1965   return 0;
1966 }
1967
1968 VLIB_INIT_FUNCTION (arp_notrace_init);
1969
1970
1971 #ifndef CLIB_MARCH_VARIANT
1972 /* Send an ARP request to see if given destination is reachable on given interface. */
1973 clib_error_t *
1974 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1975                     u8 refresh)
1976 {
1977   vnet_main_t *vnm = vnet_get_main ();
1978   ip4_main_t *im = &ip4_main;
1979   ethernet_arp_header_t *h;
1980   ip4_address_t *src;
1981   ip_interface_address_t *ia;
1982   ip_adjacency_t *adj;
1983   vnet_hw_interface_t *hi;
1984   vnet_sw_interface_t *si;
1985   vlib_buffer_t *b;
1986   adj_index_t ai;
1987   u32 bi = 0;
1988   u8 unicast_rewrite = 0;
1989
1990   si = vnet_get_sw_interface (vnm, sw_if_index);
1991
1992   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1993     {
1994       return clib_error_return (0, "%U: interface %U down",
1995                                 format_ip4_address, dst,
1996                                 format_vnet_sw_if_index_name, vnm,
1997                                 sw_if_index);
1998     }
1999
2000   src =
2001     ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2002   if (!src)
2003     {
2004       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2005       return clib_error_return
2006         (0,
2007          "no matching interface address for destination %U (interface %U)",
2008          format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2009          sw_if_index);
2010     }
2011
2012   h = vlib_packet_template_get_packet (vm,
2013                                        &im->ip4_arp_request_packet_template,
2014                                        &bi);
2015
2016   if (!h)
2017     return clib_error_return (0, "ARP request packet allocation failed");
2018
2019   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2020   if (PREDICT_FALSE (!hi->hw_address))
2021     {
2022       return clib_error_return (0, "%U: interface %U do not support ip probe",
2023                                 format_ip4_address, dst,
2024                                 format_vnet_sw_if_index_name, vnm,
2025                                 sw_if_index);
2026     }
2027
2028   clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2029                sizeof (h->ip4_over_ethernet[0].ethernet));
2030
2031   h->ip4_over_ethernet[0].ip4 = src[0];
2032   h->ip4_over_ethernet[1].ip4 = dst[0];
2033
2034   b = vlib_get_buffer (vm, bi);
2035   vnet_buffer (b)->sw_if_index[VLIB_RX] =
2036     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2037
2038   ip46_address_t nh = {
2039     .ip4 = *dst,
2040   };
2041
2042   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2043                             VNET_LINK_IP4, &nh, sw_if_index);
2044   adj = adj_get (ai);
2045
2046   /* Peer has been previously resolved, retrieve glean adj instead */
2047   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2048     {
2049       if (refresh)
2050         unicast_rewrite = 1;
2051       else
2052         {
2053           adj_unlock (ai);
2054           ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
2055                                       VNET_LINK_IP4, sw_if_index, &nh);
2056           adj = adj_get (ai);
2057         }
2058     }
2059
2060   /* Add encapsulation string for software interface (e.g. ethernet header). */
2061   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2062   if (unicast_rewrite)
2063     {
2064       u16 *etype = vlib_buffer_get_current (b) - 2;
2065       etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2066     }
2067   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2068
2069   {
2070     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2071     u32 *to_next = vlib_frame_vector_args (f);
2072     to_next[0] = bi;
2073     f->n_vectors = 1;
2074     vlib_put_frame_to_node (vm, hi->output_node_index, f);
2075   }
2076
2077   adj_unlock (ai);
2078   return /* no error */ 0;
2079 }
2080 #endif
2081
2082 typedef enum
2083 {
2084   IP4_REWRITE_NEXT_DROP,
2085   IP4_REWRITE_NEXT_ICMP_ERROR,
2086   IP4_REWRITE_NEXT_FRAGMENT,
2087   IP4_REWRITE_N_NEXT            /* Last */
2088 } ip4_rewrite_next_t;
2089
2090 /**
2091  * This bits of an IPv4 address to mask to construct a multicast
2092  * MAC address
2093  */
2094 #if CLIB_ARCH_IS_BIG_ENDIAN
2095 #define IP4_MCAST_ADDR_MASK 0x007fffff
2096 #else
2097 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2098 #endif
2099
2100 always_inline void
2101 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2102                u16 adj_packet_bytes, bool df, u16 * next, u32 * error)
2103 {
2104   if (packet_len > adj_packet_bytes)
2105     {
2106       *error = IP4_ERROR_MTU_EXCEEDED;
2107       if (df)
2108         {
2109           icmp4_error_set_vnet_buffer
2110             (b, ICMP4_destination_unreachable,
2111              ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2112              adj_packet_bytes);
2113           *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2114         }
2115       else
2116         {
2117           /* IP fragmentation */
2118           ip_frag_set_vnet_buffer (b, 0, adj_packet_bytes,
2119                                    IP4_FRAG_NEXT_IP4_REWRITE, 0);
2120           *next = IP4_REWRITE_NEXT_FRAGMENT;
2121         }
2122     }
2123 }
2124
2125 /* Decrement TTL & update checksum.
2126    Works either endian, so no need for byte swap. */
2127 static_always_inline void
2128 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2129                             u32 * error)
2130 {
2131   i32 ttl;
2132   u32 checksum;
2133   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2134     {
2135       b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2136       return;
2137     }
2138
2139   ttl = ip->ttl;
2140
2141   /* Input node should have reject packets with ttl 0. */
2142   ASSERT (ip->ttl > 0);
2143
2144   checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2145   checksum += checksum >= 0xffff;
2146
2147   ip->checksum = checksum;
2148   ttl -= 1;
2149   ip->ttl = ttl;
2150
2151   /*
2152    * If the ttl drops below 1 when forwarding, generate
2153    * an ICMP response.
2154    */
2155   if (PREDICT_FALSE (ttl <= 0))
2156     {
2157       *error = IP4_ERROR_TIME_EXPIRED;
2158       vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2159       icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2160                                    ICMP4_time_exceeded_ttl_exceeded_in_transit,
2161                                    0);
2162       *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2163     }
2164
2165   /* Verify checksum. */
2166   ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2167           (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2168 }
2169
2170
2171 always_inline uword
2172 ip4_rewrite_inline (vlib_main_t * vm,
2173                     vlib_node_runtime_t * node,
2174                     vlib_frame_t * frame,
2175                     int do_counters, int is_midchain, int is_mcast)
2176 {
2177   ip_lookup_main_t *lm = &ip4_main.lookup_main;
2178   u32 *from = vlib_frame_vector_args (frame);
2179   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2180   u16 nexts[VLIB_FRAME_SIZE], *next;
2181   u32 n_left_from;
2182   vlib_node_runtime_t *error_node =
2183     vlib_node_get_runtime (vm, ip4_input_node.index);
2184
2185   n_left_from = frame->n_vectors;
2186   u32 thread_index = vm->thread_index;
2187
2188   vlib_get_buffers (vm, from, bufs, n_left_from);
2189   clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2190
2191   if (n_left_from >= 6)
2192     {
2193       int i;
2194       for (i = 0; i < 6; i++)
2195         vlib_prefetch_buffer_header (bufs[i], LOAD);
2196     }
2197
2198   next = nexts;
2199   b = bufs;
2200   while (n_left_from >= 8)
2201     {
2202       ip_adjacency_t *adj0, *adj1;
2203       ip4_header_t *ip0, *ip1;
2204       u32 rw_len0, error0, adj_index0;
2205       u32 rw_len1, error1, adj_index1;
2206       u32 tx_sw_if_index0, tx_sw_if_index1;
2207       u8 *p;
2208
2209       vlib_prefetch_buffer_header (b[6], LOAD);
2210       vlib_prefetch_buffer_header (b[7], LOAD);
2211
2212       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2213       adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2214
2215       /*
2216        * pre-fetch the per-adjacency counters
2217        */
2218       if (do_counters)
2219         {
2220           vlib_prefetch_combined_counter (&adjacency_counters,
2221                                           thread_index, adj_index0);
2222           vlib_prefetch_combined_counter (&adjacency_counters,
2223                                           thread_index, adj_index1);
2224         }
2225
2226       ip0 = vlib_buffer_get_current (b[0]);
2227       ip1 = vlib_buffer_get_current (b[1]);
2228
2229       error0 = error1 = IP4_ERROR_NONE;
2230
2231       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2232       ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2233
2234       /* Rewrite packet header and updates lengths. */
2235       adj0 = adj_get (adj_index0);
2236       adj1 = adj_get (adj_index1);
2237
2238       /* Worth pipelining. No guarantee that adj0,1 are hot... */
2239       rw_len0 = adj0[0].rewrite_header.data_bytes;
2240       rw_len1 = adj1[0].rewrite_header.data_bytes;
2241       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2242       vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2243
2244       p = vlib_buffer_get_current (b[2]);
2245       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2246       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2247
2248       p = vlib_buffer_get_current (b[3]);
2249       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2250       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2251
2252       /* Check MTU of outgoing interface. */
2253       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2254                      adj0[0].rewrite_header.max_l3_packet_bytes,
2255                      ip0->flags_and_fragment_offset &
2256                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2257                      next + 0, &error0);
2258       ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
2259                      adj1[0].rewrite_header.max_l3_packet_bytes,
2260                      ip1->flags_and_fragment_offset &
2261                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2262                      next + 1, &error1);
2263
2264       if (is_mcast)
2265         {
2266           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2267                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2268                     IP4_ERROR_SAME_INTERFACE : error0);
2269           error1 = ((adj1[0].rewrite_header.sw_if_index ==
2270                      vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2271                     IP4_ERROR_SAME_INTERFACE : error1);
2272         }
2273
2274       b[0]->error = error_node->errors[error0];
2275       b[1]->error = error_node->errors[error1];
2276       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2277        * to see the IP headerr */
2278       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2279         {
2280           u32 next_index = adj0[0].rewrite_header.next_index;
2281           b[0]->current_data -= rw_len0;
2282           b[0]->current_length += rw_len0;
2283           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2284           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2285
2286           if (PREDICT_FALSE
2287               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2288             vnet_feature_arc_start (lm->output_feature_arc_index,
2289                                     tx_sw_if_index0, &next_index, b[0]);
2290           next[0] = next_index;
2291         }
2292       if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2293         {
2294           u32 next_index = adj1[0].rewrite_header.next_index;
2295           b[1]->current_data -= rw_len1;
2296           b[1]->current_length += rw_len1;
2297
2298           tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2299           vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2300
2301           if (PREDICT_FALSE
2302               (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2303             vnet_feature_arc_start (lm->output_feature_arc_index,
2304                                     tx_sw_if_index1, &next_index, b[1]);
2305           next[1] = next_index;
2306         }
2307
2308       /* Guess we are only writing on simple Ethernet header. */
2309       vnet_rewrite_two_headers (adj0[0], adj1[0],
2310                                 ip0, ip1, sizeof (ethernet_header_t));
2311
2312       /*
2313        * Bump the per-adjacency counters
2314        */
2315       if (do_counters)
2316         {
2317           vlib_increment_combined_counter
2318             (&adjacency_counters,
2319              thread_index,
2320              adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2321
2322           vlib_increment_combined_counter
2323             (&adjacency_counters,
2324              thread_index,
2325              adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2326         }
2327
2328       if (is_midchain)
2329         {
2330           adj0->sub_type.midchain.fixup_func
2331             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2332           adj1->sub_type.midchain.fixup_func
2333             (vm, adj1, b[1], adj0->sub_type.midchain.fixup_data);
2334         }
2335
2336       if (is_mcast)
2337         {
2338           /*
2339            * copy bytes from the IP address into the MAC rewrite
2340            */
2341           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2342                                       adj0->rewrite_header.dst_mcast_offset,
2343                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2344           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2345                                       adj0->rewrite_header.dst_mcast_offset,
2346                                       &ip1->dst_address.as_u32, (u8 *) ip1);
2347         }
2348
2349       next += 2;
2350       b += 2;
2351       n_left_from -= 2;
2352     }
2353
2354   while (n_left_from > 0)
2355     {
2356       ip_adjacency_t *adj0;
2357       ip4_header_t *ip0;
2358       u32 rw_len0, adj_index0, error0;
2359       u32 tx_sw_if_index0;
2360
2361       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2362
2363       adj0 = adj_get (adj_index0);
2364
2365       if (do_counters)
2366         vlib_prefetch_combined_counter (&adjacency_counters,
2367                                         thread_index, adj_index0);
2368
2369       ip0 = vlib_buffer_get_current (b[0]);
2370
2371       error0 = IP4_ERROR_NONE;
2372
2373       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2374
2375
2376       /* Update packet buffer attributes/set output interface. */
2377       rw_len0 = adj0[0].rewrite_header.data_bytes;
2378       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2379
2380       /* Check MTU of outgoing interface. */
2381       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2382                      adj0[0].rewrite_header.max_l3_packet_bytes,
2383                      ip0->flags_and_fragment_offset &
2384                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2385                      next + 0, &error0);
2386
2387       if (is_mcast)
2388         {
2389           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2390                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2391                     IP4_ERROR_SAME_INTERFACE : error0);
2392         }
2393       b[0]->error = error_node->errors[error0];
2394
2395       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2396        * to see the IP headerr */
2397       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2398         {
2399           u32 next_index = adj0[0].rewrite_header.next_index;
2400           b[0]->current_data -= rw_len0;
2401           b[0]->current_length += rw_len0;
2402           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2403           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2404
2405           if (PREDICT_FALSE
2406               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2407             vnet_feature_arc_start (lm->output_feature_arc_index,
2408                                     tx_sw_if_index0, &next_index, b[0]);
2409           next[0] = next_index;
2410         }
2411
2412       /* Guess we are only writing on simple Ethernet header. */
2413       vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2414
2415       if (do_counters)
2416         vlib_increment_combined_counter
2417           (&adjacency_counters,
2418            thread_index, adj_index0, 1,
2419            vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2420
2421       if (is_midchain)
2422         {
2423           adj0->sub_type.midchain.fixup_func
2424             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2425         }
2426
2427       if (is_mcast)
2428         {
2429           /*
2430            * copy bytes from the IP address into the MAC rewrite
2431            */
2432           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2433                                       adj0->rewrite_header.dst_mcast_offset,
2434                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2435         }
2436
2437       next += 1;
2438       b += 1;
2439       n_left_from -= 1;
2440     }
2441
2442
2443   /* Need to do trace after rewrites to pick up new packet data. */
2444   if (node->flags & VLIB_NODE_FLAG_TRACE)
2445     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2446
2447   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2448   return frame->n_vectors;
2449 }
2450
2451
2452 /** @brief IPv4 rewrite node.
2453     @node ip4-rewrite
2454
2455     This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2456     header checksum, fetch the ip adjacency, check the outbound mtu,
2457     apply the adjacency rewrite, and send pkts to the adjacency
2458     rewrite header's rewrite_next_index.
2459
2460     @param vm vlib_main_t corresponding to the current thread
2461     @param node vlib_node_runtime_t
2462     @param frame vlib_frame_t whose contents should be dispatched
2463
2464     @par Graph mechanics: buffer metadata, next index usage
2465
2466     @em Uses:
2467     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2468         - the rewrite adjacency index
2469     - <code>adj->lookup_next_index</code>
2470         - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2471           the packet will be dropped.
2472     - <code>adj->rewrite_header</code>
2473         - Rewrite string length, rewrite string, next_index
2474
2475     @em Sets:
2476     - <code>b->current_data, b->current_length</code>
2477         - Updated net of applying the rewrite string
2478
2479     <em>Next Indices:</em>
2480     - <code> adj->rewrite_header.next_index </code>
2481       or @c ip4-drop
2482 */
2483
2484 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2485                                  vlib_frame_t * frame)
2486 {
2487   if (adj_are_counters_enabled ())
2488     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2489   else
2490     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2491 }
2492
2493 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2494                                        vlib_node_runtime_t * node,
2495                                        vlib_frame_t * frame)
2496 {
2497   if (adj_are_counters_enabled ())
2498     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2499   else
2500     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2501 }
2502
2503 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2504                                   vlib_node_runtime_t * node,
2505                                   vlib_frame_t * frame)
2506 {
2507   if (adj_are_counters_enabled ())
2508     return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2509   else
2510     return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2511 }
2512
2513 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2514                                        vlib_node_runtime_t * node,
2515                                        vlib_frame_t * frame)
2516 {
2517   if (adj_are_counters_enabled ())
2518     return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2519   else
2520     return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2521 }
2522
2523 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2524                                         vlib_node_runtime_t * node,
2525                                         vlib_frame_t * frame)
2526 {
2527   if (adj_are_counters_enabled ())
2528     return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2529   else
2530     return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2531 }
2532
2533 /* *INDENT-OFF* */
2534 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2535   .name = "ip4-rewrite",
2536   .vector_size = sizeof (u32),
2537
2538   .format_trace = format_ip4_rewrite_trace,
2539
2540   .n_next_nodes = IP4_REWRITE_N_NEXT,
2541   .next_nodes = {
2542     [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2543     [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2544     [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2545   },
2546 };
2547
2548 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2549   .name = "ip4-rewrite-bcast",
2550   .vector_size = sizeof (u32),
2551
2552   .format_trace = format_ip4_rewrite_trace,
2553   .sibling_of = "ip4-rewrite",
2554 };
2555
2556 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2557   .name = "ip4-rewrite-mcast",
2558   .vector_size = sizeof (u32),
2559
2560   .format_trace = format_ip4_rewrite_trace,
2561   .sibling_of = "ip4-rewrite",
2562 };
2563
2564 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2565   .name = "ip4-mcast-midchain",
2566   .vector_size = sizeof (u32),
2567
2568   .format_trace = format_ip4_rewrite_trace,
2569   .sibling_of = "ip4-rewrite",
2570 };
2571
2572 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2573   .name = "ip4-midchain",
2574   .vector_size = sizeof (u32),
2575   .format_trace = format_ip4_forward_next_trace,
2576   .sibling_of =  "ip4-rewrite",
2577 };
2578 /* *INDENT-ON */
2579
2580 static int
2581 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2582 {
2583   ip4_fib_mtrie_t *mtrie0;
2584   ip4_fib_mtrie_leaf_t leaf0;
2585   u32 lbi0;
2586
2587   mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2588
2589   leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2590   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2591   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2592
2593   lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2594
2595   return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2596 }
2597
2598 static clib_error_t *
2599 test_lookup_command_fn (vlib_main_t * vm,
2600                         unformat_input_t * input, vlib_cli_command_t * cmd)
2601 {
2602   ip4_fib_t *fib;
2603   u32 table_id = 0;
2604   f64 count = 1;
2605   u32 n;
2606   int i;
2607   ip4_address_t ip4_base_address;
2608   u64 errors = 0;
2609
2610   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2611     {
2612       if (unformat (input, "table %d", &table_id))
2613         {
2614           /* Make sure the entry exists. */
2615           fib = ip4_fib_get (table_id);
2616           if ((fib) && (fib->index != table_id))
2617             return clib_error_return (0, "<fib-index> %d does not exist",
2618                                       table_id);
2619         }
2620       else if (unformat (input, "count %f", &count))
2621         ;
2622
2623       else if (unformat (input, "%U",
2624                          unformat_ip4_address, &ip4_base_address))
2625         ;
2626       else
2627         return clib_error_return (0, "unknown input `%U'",
2628                                   format_unformat_error, input);
2629     }
2630
2631   n = count;
2632
2633   for (i = 0; i < n; i++)
2634     {
2635       if (!ip4_lookup_validate (&ip4_base_address, table_id))
2636         errors++;
2637
2638       ip4_base_address.as_u32 =
2639         clib_host_to_net_u32 (1 +
2640                               clib_net_to_host_u32 (ip4_base_address.as_u32));
2641     }
2642
2643   if (errors)
2644     vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2645   else
2646     vlib_cli_output (vm, "No errors in %d lookups\n", n);
2647
2648   return 0;
2649 }
2650
2651 /*?
2652  * Perform a lookup of an IPv4 Address (or range of addresses) in the
2653  * given FIB table to determine if there is a conflict with the
2654  * adjacency table. The fib-id can be determined by using the
2655  * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2656  * of 0 is used.
2657  *
2658  * @todo This command uses fib-id, other commands use table-id (not
2659  * just a name, they are different indexes). Would like to change this
2660  * to table-id for consistency.
2661  *
2662  * @cliexpar
2663  * Example of how to run the test lookup command:
2664  * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2665  * No errors in 2 lookups
2666  * @cliexend
2667 ?*/
2668 /* *INDENT-OFF* */
2669 VLIB_CLI_COMMAND (lookup_test_command, static) =
2670 {
2671   .path = "test lookup",
2672   .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2673   .function = test_lookup_command_fn,
2674 };
2675 /* *INDENT-ON* */
2676
2677 #ifndef CLIB_MARCH_VARIANT
2678 int
2679 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2680 {
2681   u32 fib_index;
2682
2683   fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2684
2685   if (~0 == fib_index)
2686     return VNET_API_ERROR_NO_SUCH_FIB;
2687
2688   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2689                                   flow_hash_config);
2690
2691   return 0;
2692 }
2693 #endif
2694
2695 static clib_error_t *
2696 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2697                              unformat_input_t * input,
2698                              vlib_cli_command_t * cmd)
2699 {
2700   int matched = 0;
2701   u32 table_id = 0;
2702   u32 flow_hash_config = 0;
2703   int rv;
2704
2705   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2706     {
2707       if (unformat (input, "table %d", &table_id))
2708         matched = 1;
2709 #define _(a,v) \
2710     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2711       foreach_flow_hash_bit
2712 #undef _
2713         else
2714         break;
2715     }
2716
2717   if (matched == 0)
2718     return clib_error_return (0, "unknown input `%U'",
2719                               format_unformat_error, input);
2720
2721   rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2722   switch (rv)
2723     {
2724     case 0:
2725       break;
2726
2727     case VNET_API_ERROR_NO_SUCH_FIB:
2728       return clib_error_return (0, "no such FIB table %d", table_id);
2729
2730     default:
2731       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2732       break;
2733     }
2734
2735   return 0;
2736 }
2737
2738 /*?
2739  * Configure the set of IPv4 fields used by the flow hash.
2740  *
2741  * @cliexpar
2742  * Example of how to set the flow hash on a given table:
2743  * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2744  * Example of display the configured flow hash:
2745  * @cliexstart{show ip fib}
2746  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2747  * 0.0.0.0/0
2748  *   unicast-ip4-chain
2749  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2750  *     [0] [@0]: dpo-drop ip6
2751  * 0.0.0.0/32
2752  *   unicast-ip4-chain
2753  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2754  *     [0] [@0]: dpo-drop ip6
2755  * 224.0.0.0/8
2756  *   unicast-ip4-chain
2757  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2758  *     [0] [@0]: dpo-drop ip6
2759  * 6.0.1.2/32
2760  *   unicast-ip4-chain
2761  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2762  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2763  * 7.0.0.1/32
2764  *   unicast-ip4-chain
2765  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2766  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2767  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2768  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2769  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2770  * 240.0.0.0/8
2771  *   unicast-ip4-chain
2772  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2773  *     [0] [@0]: dpo-drop ip6
2774  * 255.255.255.255/32
2775  *   unicast-ip4-chain
2776  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2777  *     [0] [@0]: dpo-drop ip6
2778  * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2779  * 0.0.0.0/0
2780  *   unicast-ip4-chain
2781  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2782  *     [0] [@0]: dpo-drop ip6
2783  * 0.0.0.0/32
2784  *   unicast-ip4-chain
2785  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2786  *     [0] [@0]: dpo-drop ip6
2787  * 172.16.1.0/24
2788  *   unicast-ip4-chain
2789  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2790  *     [0] [@4]: ipv4-glean: af_packet0
2791  * 172.16.1.1/32
2792  *   unicast-ip4-chain
2793  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2794  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2795  * 172.16.1.2/32
2796  *   unicast-ip4-chain
2797  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2798  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2799  * 172.16.2.0/24
2800  *   unicast-ip4-chain
2801  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2802  *     [0] [@4]: ipv4-glean: af_packet1
2803  * 172.16.2.1/32
2804  *   unicast-ip4-chain
2805  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2806  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2807  * 224.0.0.0/8
2808  *   unicast-ip4-chain
2809  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2810  *     [0] [@0]: dpo-drop ip6
2811  * 240.0.0.0/8
2812  *   unicast-ip4-chain
2813  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2814  *     [0] [@0]: dpo-drop ip6
2815  * 255.255.255.255/32
2816  *   unicast-ip4-chain
2817  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2818  *     [0] [@0]: dpo-drop ip6
2819  * @cliexend
2820 ?*/
2821 /* *INDENT-OFF* */
2822 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2823 {
2824   .path = "set ip flow-hash",
2825   .short_help =
2826   "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2827   .function = set_ip_flow_hash_command_fn,
2828 };
2829 /* *INDENT-ON* */
2830
2831 #ifndef CLIB_MARCH_VARIANT
2832 int
2833 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2834                              u32 table_index)
2835 {
2836   vnet_main_t *vnm = vnet_get_main ();
2837   vnet_interface_main_t *im = &vnm->interface_main;
2838   ip4_main_t *ipm = &ip4_main;
2839   ip_lookup_main_t *lm = &ipm->lookup_main;
2840   vnet_classify_main_t *cm = &vnet_classify_main;
2841   ip4_address_t *if_addr;
2842
2843   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2844     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2845
2846   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2847     return VNET_API_ERROR_NO_SUCH_ENTRY;
2848
2849   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2850   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2851
2852   if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2853
2854   if (NULL != if_addr)
2855     {
2856       fib_prefix_t pfx = {
2857         .fp_len = 32,
2858         .fp_proto = FIB_PROTOCOL_IP4,
2859         .fp_addr.ip4 = *if_addr,
2860       };
2861       u32 fib_index;
2862
2863       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2864                                                        sw_if_index);
2865
2866
2867       if (table_index != (u32) ~ 0)
2868         {
2869           dpo_id_t dpo = DPO_INVALID;
2870
2871           dpo_set (&dpo,
2872                    DPO_CLASSIFY,
2873                    DPO_PROTO_IP4,
2874                    classify_dpo_create (DPO_PROTO_IP4, table_index));
2875
2876           fib_table_entry_special_dpo_add (fib_index,
2877                                            &pfx,
2878                                            FIB_SOURCE_CLASSIFY,
2879                                            FIB_ENTRY_FLAG_NONE, &dpo);
2880           dpo_reset (&dpo);
2881         }
2882       else
2883         {
2884           fib_table_entry_special_remove (fib_index,
2885                                           &pfx, FIB_SOURCE_CLASSIFY);
2886         }
2887     }
2888
2889   return 0;
2890 }
2891 #endif
2892
2893 static clib_error_t *
2894 set_ip_classify_command_fn (vlib_main_t * vm,
2895                             unformat_input_t * input,
2896                             vlib_cli_command_t * cmd)
2897 {
2898   u32 table_index = ~0;
2899   int table_index_set = 0;
2900   u32 sw_if_index = ~0;
2901   int rv;
2902
2903   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2904     {
2905       if (unformat (input, "table-index %d", &table_index))
2906         table_index_set = 1;
2907       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2908                          vnet_get_main (), &sw_if_index))
2909         ;
2910       else
2911         break;
2912     }
2913
2914   if (table_index_set == 0)
2915     return clib_error_return (0, "classify table-index must be specified");
2916
2917   if (sw_if_index == ~0)
2918     return clib_error_return (0, "interface / subif must be specified");
2919
2920   rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2921
2922   switch (rv)
2923     {
2924     case 0:
2925       break;
2926
2927     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2928       return clib_error_return (0, "No such interface");
2929
2930     case VNET_API_ERROR_NO_SUCH_ENTRY:
2931       return clib_error_return (0, "No such classifier table");
2932     }
2933   return 0;
2934 }
2935
2936 /*?
2937  * Assign a classification table to an interface. The classification
2938  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2939  * commands. Once the table is create, use this command to filter packets
2940  * on an interface.
2941  *
2942  * @cliexpar
2943  * Example of how to assign a classification table to an interface:
2944  * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2945 ?*/
2946 /* *INDENT-OFF* */
2947 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2948 {
2949     .path = "set ip classify",
2950     .short_help =
2951     "set ip classify intfc <interface> table-index <classify-idx>",
2952     .function = set_ip_classify_command_fn,
2953 };
2954 /* *INDENT-ON* */
2955
2956 static clib_error_t *
2957 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2958 {
2959   ip4_main_t *im = &ip4_main;
2960   uword heapsize = 0;
2961
2962   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2963     {
2964       if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2965         ;
2966       else
2967         return clib_error_return (0,
2968                                   "invalid heap-size parameter `%U'",
2969                                   format_unformat_error, input);
2970     }
2971
2972   im->mtrie_heap_size = heapsize;
2973
2974   return 0;
2975 }
2976
2977 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2978
2979 /*
2980  * fd.io coding-style-patch-verification: ON
2981  *
2982  * Local Variables:
2983  * eval: (c-set-style "gnu")
2984  * End:
2985  */