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   while (n_left_from > 0)
 127     {
 128       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 129
 130
 131       while (n_left_from >= 4 && n_left_to_next >= 2)
 132         {
 133           ip_lookup_next_t next0, next1;
 134           const load_balance_t *lb0, *lb1;
 135           vlib_buffer_t *p0, *p1;
 136           u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
 137           const ip4_header_t *ip0, *ip1;
 138           const dpo_id_t *dpo0, *dpo1;
 139
 140           /* Prefetch next iteration. */
 141           {
 142             vlib_buffer_t *p2, *p3;
 143
 144             p2 = vlib_get_buffer (vm, from[2]);
 145             p3 = vlib_get_buffer (vm, from[3]);
 146
 147             vlib_prefetch_buffer_header (p2, STORE);
 148             vlib_prefetch_buffer_header (p3, STORE);
 149
 150             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 151             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 152           }
 153
 154           pi0 = to_next[0] = from[0];
 155           pi1 = to_next[1] = from[1];
 156
 157           from += 2;
 158           n_left_from -= 2;
 159           to_next += 2;
 160           n_left_to_next -= 2;
 161
 162           p0 = vlib_get_buffer (vm, pi0);
 163           p1 = vlib_get_buffer (vm, pi1);
 164
 165           ip0 = vlib_buffer_get_current (p0);
 166           ip1 = vlib_buffer_get_current (p1);
 167           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 168           lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
 169
 170           lb0 = load_balance_get (lbi0);
 171           lb1 = load_balance_get (lbi1);
 172
 173           /*
 174            * this node is for via FIBs we can re-use the hash value from the
 175            * to node if present.
 176            * We don't want to use the same hash value at each level in the recursion
 177            * graph as that would lead to polarisation
 178            */
 179           hc0 = hc1 = 0;
 180
 181           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 182             {
 183               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 184                 {
 185                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 186                     vnet_buffer (p0)->ip.flow_hash >> 1;
 187                 }
 188               else
 189                 {
 190                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 191                     ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 192                 }
 193               dpo0 = load_balance_get_fwd_bucket
 194                 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 195             }
 196           else
 197             {
 198               dpo0 = load_balance_get_bucket_i (lb0, 0);
 199             }
 200           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 201             {
 202               if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
 203                 {
 204                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 205                     vnet_buffer (p1)->ip.flow_hash >> 1;
 206                 }
 207               else
 208                 {
 209                   hc1 = vnet_buffer (p1)->ip.flow_hash =
 210                     ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
 211                 }
 212               dpo1 = load_balance_get_fwd_bucket
 213                 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 214             }
 215           else
 216             {
 217               dpo1 = load_balance_get_bucket_i (lb1, 0);
 218             }
 219
 220           next0 = dpo0->dpoi_next_node;
 221           next1 = dpo1->dpoi_next_node;
 222
 223           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 224           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 225
 226           vlib_increment_combined_counter
 227             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 228           vlib_increment_combined_counter
 229             (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
 230
 231           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 232                                            to_next, n_left_to_next,
 233                                            pi0, pi1, next0, next1);
 234         }
 235
 236       while (n_left_from > 0 && n_left_to_next > 0)
 237         {
 238           ip_lookup_next_t next0;
 239           const load_balance_t *lb0;
 240           vlib_buffer_t *p0;
 241           u32 pi0, lbi0, hc0;
 242           const ip4_header_t *ip0;
 243           const dpo_id_t *dpo0;
 244
 245           pi0 = from[0];
 246           to_next[0] = pi0;
 247           from += 1;
 248           to_next += 1;
 249           n_left_to_next -= 1;
 250           n_left_from -= 1;
 251
 252           p0 = vlib_get_buffer (vm, pi0);
 253
 254           ip0 = vlib_buffer_get_current (p0);
 255           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 256
 257           lb0 = load_balance_get (lbi0);
 258
 259           hc0 = 0;
 260           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 261             {
 262               if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
 263                 {
 264                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 265                     vnet_buffer (p0)->ip.flow_hash >> 1;
 266                 }
 267               else
 268                 {
 269                   hc0 = vnet_buffer (p0)->ip.flow_hash =
 270                     ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 271                 }
 272               dpo0 = load_balance_get_fwd_bucket
 273                 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 274             }
 275           else
 276             {
 277               dpo0 = load_balance_get_bucket_i (lb0, 0);
 278             }
 279
 280           next0 = dpo0->dpoi_next_node;
 281           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 282
 283           vlib_increment_combined_counter
 284             (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
 285
 286           vlib_validate_buffer_enqueue_x1 (vm, node, next,
 287                                            to_next, n_left_to_next,
 288                                            pi0, next0);
 289         }
 290
 291       vlib_put_next_frame (vm, node, next, n_left_to_next);
 292     }
 293
 294   if (node->flags & VLIB_NODE_FLAG_TRACE)
 295     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 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   .last_in_arc = "ip4-lookup",
 715   .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
 716 };
 717
 718 VNET_FEATURE_INIT (ip4_flow_classify, static) =
 719 {
 720   .arc_name = "ip4-unicast",
 721   .node_name = "ip4-flow-classify",
 722   .runs_before = VNET_FEATURES ("ip4-inacl"),
 723 };
 724
 725 VNET_FEATURE_INIT (ip4_inacl, static) =
 726 {
 727   .arc_name = "ip4-unicast",
 728   .node_name = "ip4-inacl",
 729   .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
 730 };
 731
 732 VNET_FEATURE_INIT (ip4_source_check_1, static) =
 733 {
 734   .arc_name = "ip4-unicast",
 735   .node_name = "ip4-source-check-via-rx",
 736   .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
 737 };
 738
 739 VNET_FEATURE_INIT (ip4_source_check_2, static) =
 740 {
 741   .arc_name = "ip4-unicast",
 742   .node_name = "ip4-source-check-via-any",
 743   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 744 };
 745
 746 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
 747 {
 748   .arc_name = "ip4-unicast",
 749   .node_name = "ip4-source-and-port-range-check-rx",
 750   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 751 };
 752
 753 VNET_FEATURE_INIT (ip4_policer_classify, static) =
 754 {
 755   .arc_name = "ip4-unicast",
 756   .node_name = "ip4-policer-classify",
 757   .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
 758 };
 759
 760 VNET_FEATURE_INIT (ip4_ipsec, static) =
 761 {
 762   .arc_name = "ip4-unicast",
 763   .node_name = "ipsec4-input-feature",
 764   .runs_before = VNET_FEATURES ("vpath-input-ip4"),
 765 };
 766
 767 VNET_FEATURE_INIT (ip4_vpath, static) =
 768 {
 769   .arc_name = "ip4-unicast",
 770   .node_name = "vpath-input-ip4",
 771   .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
 772 };
 773
 774 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
 775 {
 776   .arc_name = "ip4-unicast",
 777   .node_name = "ip4-vxlan-bypass",
 778   .runs_before = VNET_FEATURES ("ip4-lookup"),
 779 };
 780
 781 VNET_FEATURE_INIT (ip4_not_enabled, static) =
 782 {
 783   .arc_name = "ip4-unicast",
 784   .node_name = "ip4-not-enabled",
 785   .runs_before = VNET_FEATURES ("ip4-lookup"),
 786 };
 787
 788 VNET_FEATURE_INIT (ip4_lookup, static) =
 789 {
 790   .arc_name = "ip4-unicast",
 791   .node_name = "ip4-lookup",
 792   .runs_before = 0,     /* not before any other features */
 793 };
 794
 795 /* Built-in ip4 multicast rx feature path definition */
 796 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
 797 {
 798   .arc_name = "ip4-multicast",
 799   .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
 800   .last_in_arc = "ip4-mfib-forward-lookup",
 801   .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
 802 };
 803
 804 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
 805 {
 806   .arc_name = "ip4-multicast",
 807   .node_name = "vpath-input-ip4",
 808   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
 809 };
 810
 811 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
 812 {
 813   .arc_name = "ip4-multicast",
 814   .node_name = "ip4-not-enabled",
 815   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
 816 };
 817
 818 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
 819 {
 820   .arc_name = "ip4-multicast",
 821   .node_name = "ip4-mfib-forward-lookup",
 822   .runs_before = 0,     /* last feature */
 823 };
 824
 825 /* Source and port-range check ip4 tx feature path definition */
 826 VNET_FEATURE_ARC_INIT (ip4_output, static) =
 827 {
 828   .arc_name = "ip4-output",
 829   .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
 830   .last_in_arc = "interface-output",
 831   .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
 832 };
 833
 834 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
 835 {
 836   .arc_name = "ip4-output",
 837   .node_name = "ip4-source-and-port-range-check-tx",
 838   .runs_before = VNET_FEATURES ("ip4-outacl"),
 839 };
 840
 841 VNET_FEATURE_INIT (ip4_outacl, static) =
 842 {
 843   .arc_name = "ip4-output",
 844   .node_name = "ip4-outacl",
 845   .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
 846 };
 847
 848 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
 849 {
 850   .arc_name = "ip4-output",
 851   .node_name = "ipsec4-output-feature",
 852   .runs_before = VNET_FEATURES ("interface-output"),
 853 };
 854
 855 /* Built-in ip4 tx feature path definition */
 856 VNET_FEATURE_INIT (ip4_interface_output, static) =
 857 {
 858   .arc_name = "ip4-output",
 859   .node_name = "interface-output",
 860   .runs_before = 0,     /* not before any other features */
 861 };
 862 /* *INDENT-ON* */
 863
 864 static clib_error_t *
 865 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
 866 {
 867   ip4_main_t *im = &ip4_main;
 868
 869   /* Fill in lookup tables with default table (0). */
 870   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 871   vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
 872
 873   if (!is_add)
 874     {
 875       ip4_main_t *im4 = &ip4_main;
 876       ip_lookup_main_t *lm4 = &im4->lookup_main;
 877       ip_interface_address_t *ia = 0;
 878       ip4_address_t *address;
 879       vlib_main_t *vm = vlib_get_main ();
 880
 881       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
 882       /* *INDENT-OFF* */
 883       foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
 884       ({
 885         address = ip_interface_address_get_address (lm4, ia);
 886         ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
 887       }));
 888       /* *INDENT-ON* */
 889     }
 890
 891   vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
 892                                is_add, 0, 0);
 893
 894   vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
 895                                sw_if_index, is_add, 0, 0);
 896
 897   return /* no error */ 0;
 898 }
 899
 900 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
 901
 902 /* Global IP4 main. */
 903 ip4_main_t ip4_main;
 904
 905 static clib_error_t *
 906 ip4_lookup_init (vlib_main_t * vm)
 907 {
 908   ip4_main_t *im = &ip4_main;
 909   clib_error_t *error;
 910   uword i;
 911
 912   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
 913     return error;
 914   if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
 915     return (error);
 916   if ((error = vlib_call_init_function (vm, fib_module_init)))
 917     return error;
 918   if ((error = vlib_call_init_function (vm, mfib_module_init)))
 919     return error;
 920
 921   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
 922     {
 923       u32 m;
 924
 925       if (i < 32)
 926         m = pow2_mask (i) << (32 - i);
 927       else
 928         m = ~0;
 929       im->fib_masks[i] = clib_host_to_net_u32 (m);
 930     }
 931
 932   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
 933
 934   /* Create FIB with index 0 and table id of 0. */
 935   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
 936                                      FIB_SOURCE_DEFAULT_ROUTE);
 937   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
 938                                       MFIB_SOURCE_DEFAULT_ROUTE);
 939
 940   {
 941     pg_node_t *pn;
 942     pn = pg_get_node (ip4_lookup_node.index);
 943     pn->unformat_edit = unformat_pg_ip4_header;
 944   }
 945
 946   {
 947     ethernet_arp_header_t h;
 948
 949     clib_memset (&h, 0, sizeof (h));
 950
 951     /* Set target ethernet address to all zeros. */
 952     clib_memset (h.ip4_over_ethernet[1].ethernet, 0,
 953                  sizeof (h.ip4_over_ethernet[1].ethernet));
 954
 955 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
 956 #define _8(f,v) h.f = v;
 957     _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
 958     _16 (l3_type, ETHERNET_TYPE_IP4);
 959     _8 (n_l2_address_bytes, 6);
 960     _8 (n_l3_address_bytes, 4);
 961     _16 (opcode, ETHERNET_ARP_OPCODE_request);
 962 #undef _16
 963 #undef _8
 964
 965     vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
 966                                /* data */ &h,
 967                                sizeof (h),
 968                                /* alloc chunk size */ 8,
 969                                "ip4 arp");
 970   }
 971
 972   return error;
 973 }
 974
 975 VLIB_INIT_FUNCTION (ip4_lookup_init);
 976
 977 typedef struct
 978 {
 979   /* Adjacency taken. */
 980   u32 dpo_index;
 981   u32 flow_hash;
 982   u32 fib_index;
 983
 984   /* Packet data, possibly *after* rewrite. */
 985   u8 packet_data[64 - 1 * sizeof (u32)];
 986 }
 987 ip4_forward_next_trace_t;
 988
 989 #ifndef CLIB_MARCH_VARIANT
 990 u8 *
 991 format_ip4_forward_next_trace (u8 * s, va_list * args)
 992 {
 993   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 994   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 995   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
 996   u32 indent = format_get_indent (s);
 997   s = format (s, "%U%U",
 998               format_white_space, indent,
 999               format_ip4_header, t->packet_data, sizeof (t->packet_data));
1000   return s;
1001 }
1002 #endif
1003
1004 static u8 *
1005 format_ip4_lookup_trace (u8 * s, va_list * args)
1006 {
1007   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1008   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1009   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1010   u32 indent = format_get_indent (s);
1011
1012   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1013               t->fib_index, t->dpo_index, t->flow_hash);
1014   s = format (s, "\n%U%U",
1015               format_white_space, indent,
1016               format_ip4_header, t->packet_data, sizeof (t->packet_data));
1017   return s;
1018 }
1019
1020 static u8 *
1021 format_ip4_rewrite_trace (u8 * s, va_list * args)
1022 {
1023   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1024   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1025   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1026   u32 indent = format_get_indent (s);
1027
1028   s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1029               t->fib_index, t->dpo_index, format_ip_adjacency,
1030               t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1031   s = format (s, "\n%U%U",
1032               format_white_space, indent,
1033               format_ip_adjacency_packet_data,
1034               t->dpo_index, t->packet_data, sizeof (t->packet_data));
1035   return s;
1036 }
1037
1038 #ifndef CLIB_MARCH_VARIANT
1039 /* Common trace function for all ip4-forward next nodes. */
1040 void
1041 ip4_forward_next_trace (vlib_main_t * vm,
1042                         vlib_node_runtime_t * node,
1043                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1044 {
1045   u32 *from, n_left;
1046   ip4_main_t *im = &ip4_main;
1047
1048   n_left = frame->n_vectors;
1049   from = vlib_frame_vector_args (frame);
1050
1051   while (n_left >= 4)
1052     {
1053       u32 bi0, bi1;
1054       vlib_buffer_t *b0, *b1;
1055       ip4_forward_next_trace_t *t0, *t1;
1056
1057       /* Prefetch next iteration. */
1058       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1059       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1060
1061       bi0 = from[0];
1062       bi1 = from[1];
1063
1064       b0 = vlib_get_buffer (vm, bi0);
1065       b1 = vlib_get_buffer (vm, bi1);
1066
1067       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1068         {
1069           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1070           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1071           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1072           t0->fib_index =
1073             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1074              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1075             vec_elt (im->fib_index_by_sw_if_index,
1076                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1077
1078           clib_memcpy_fast (t0->packet_data,
1079                             vlib_buffer_get_current (b0),
1080                             sizeof (t0->packet_data));
1081         }
1082       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1083         {
1084           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1085           t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1086           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1087           t1->fib_index =
1088             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1089              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1090             vec_elt (im->fib_index_by_sw_if_index,
1091                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1092           clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1093                             sizeof (t1->packet_data));
1094         }
1095       from += 2;
1096       n_left -= 2;
1097     }
1098
1099   while (n_left >= 1)
1100     {
1101       u32 bi0;
1102       vlib_buffer_t *b0;
1103       ip4_forward_next_trace_t *t0;
1104
1105       bi0 = from[0];
1106
1107       b0 = vlib_get_buffer (vm, bi0);
1108
1109       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1110         {
1111           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1112           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1113           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1114           t0->fib_index =
1115             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1116              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1117             vec_elt (im->fib_index_by_sw_if_index,
1118                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1119           clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1120                             sizeof (t0->packet_data));
1121         }
1122       from += 1;
1123       n_left -= 1;
1124     }
1125 }
1126
1127 /* Compute TCP/UDP/ICMP4 checksum in software. */
1128 u16
1129 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1130                               ip4_header_t * ip0)
1131 {
1132   ip_csum_t sum0;
1133   u32 ip_header_length, payload_length_host_byte_order;
1134   u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1135   u16 sum16;
1136   void *data_this_buffer;
1137
1138   /* Initialize checksum with ip header. */
1139   ip_header_length = ip4_header_bytes (ip0);
1140   payload_length_host_byte_order =
1141     clib_net_to_host_u16 (ip0->length) - ip_header_length;
1142   sum0 =
1143     clib_host_to_net_u32 (payload_length_host_byte_order +
1144                           (ip0->protocol << 16));
1145
1146   if (BITS (uword) == 32)
1147     {
1148       sum0 =
1149         ip_csum_with_carry (sum0,
1150                             clib_mem_unaligned (&ip0->src_address, u32));
1151       sum0 =
1152         ip_csum_with_carry (sum0,
1153                             clib_mem_unaligned (&ip0->dst_address, u32));
1154     }
1155   else
1156     sum0 =
1157       ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1158
1159   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1160   data_this_buffer = (void *) ip0 + ip_header_length;
1161   n_ip_bytes_this_buffer =
1162     p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1163   if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1164     {
1165       n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1166         n_ip_bytes_this_buffer - ip_header_length : 0;
1167     }
1168   while (1)
1169     {
1170       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1171       n_bytes_left -= n_this_buffer;
1172       if (n_bytes_left == 0)
1173         break;
1174
1175       ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1176       p0 = vlib_get_buffer (vm, p0->next_buffer);
1177       data_this_buffer = vlib_buffer_get_current (p0);
1178       n_this_buffer = p0->current_length;
1179     }
1180
1181   sum16 = ~ip_csum_fold (sum0);
1182
1183   return sum16;
1184 }
1185
1186 u32
1187 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1188 {
1189   ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1190   udp_header_t *udp0;
1191   u16 sum16;
1192
1193   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1194           || ip0->protocol == IP_PROTOCOL_UDP);
1195
1196   udp0 = (void *) (ip0 + 1);
1197   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1198     {
1199       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1200                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1201       return p0->flags;
1202     }
1203
1204   sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1205
1206   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1207                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1208
1209   return p0->flags;
1210 }
1211 #endif
1212
1213 /* *INDENT-OFF* */
1214 VNET_FEATURE_ARC_INIT (ip4_local) =
1215 {
1216   .arc_name  = "ip4-local",
1217   .start_nodes = VNET_FEATURES ("ip4-local"),
1218   .last_in_arc = "ip4-local-end-of-arc",
1219 };
1220 /* *INDENT-ON* */
1221
1222 static inline void
1223 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1224                             ip4_header_t * ip, u8 is_udp, u8 * error,
1225                             u8 * good_tcp_udp)
1226 {
1227   u32 flags0;
1228   flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1229   *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1230   if (is_udp)
1231     {
1232       udp_header_t *udp;
1233       u32 ip_len, udp_len;
1234       i32 len_diff;
1235       udp = ip4_next_header (ip);
1236       /* Verify UDP length. */
1237       ip_len = clib_net_to_host_u16 (ip->length);
1238       udp_len = clib_net_to_host_u16 (udp->length);
1239
1240       len_diff = ip_len - udp_len;
1241       *good_tcp_udp &= len_diff >= 0;
1242       *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1243     }
1244 }
1245
1246 #define ip4_local_csum_is_offloaded(_b)                                 \
1247     _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM                         \
1248         || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1249
1250 #define ip4_local_need_csum_check(is_tcp_udp, _b)                       \
1251     (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED     \
1252         || ip4_local_csum_is_offloaded (_b)))
1253
1254 #define ip4_local_csum_is_valid(_b)                                     \
1255     (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT                      \
1256         || (ip4_local_csum_is_offloaded (_b))) != 0
1257
1258 static inline void
1259 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1260                          ip4_header_t * ih, u8 * error)
1261 {
1262   u8 is_udp, is_tcp_udp, good_tcp_udp;
1263
1264   is_udp = ih->protocol == IP_PROTOCOL_UDP;
1265   is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1266
1267   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1268     ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1269   else
1270     good_tcp_udp = ip4_local_csum_is_valid (b);
1271
1272   ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1273   *error = (is_tcp_udp && !good_tcp_udp
1274             ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1275 }
1276
1277 static inline void
1278 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1279                             ip4_header_t ** ih, u8 * error)
1280 {
1281   u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1282
1283   is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1284   is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1285
1286   is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1287   is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1288
1289   good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1290   good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1291
1292   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1293                      || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1294     {
1295       if (is_tcp_udp[0])
1296         ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1297                                     &good_tcp_udp[0]);
1298       if (is_tcp_udp[1])
1299         ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1300                                     &good_tcp_udp[1]);
1301     }
1302
1303   error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1304               IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1305   error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1306               IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1307 }
1308
1309 static inline void
1310 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1311                               vlib_buffer_t * b, u16 * next, u8 error,
1312                               u8 head_of_feature_arc)
1313 {
1314   u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1315   u32 next_index;
1316
1317   *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1318   b->error = error ? error_node->errors[error] : 0;
1319   if (head_of_feature_arc)
1320     {
1321       next_index = *next;
1322       if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1323         {
1324           vnet_feature_arc_start (arc_index,
1325                                   vnet_buffer (b)->sw_if_index[VLIB_RX],
1326                                   &next_index, b);
1327           *next = next_index;
1328         }
1329     }
1330 }
1331
1332 typedef struct
1333 {
1334   ip4_address_t src;
1335   u32 lbi;
1336   u8 error;
1337   u8 first;
1338 } ip4_local_last_check_t;
1339
1340 static inline void
1341 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1342                      ip4_local_last_check_t * last_check, u8 * error0)
1343 {
1344   ip4_fib_mtrie_leaf_t leaf0;
1345   ip4_fib_mtrie_t *mtrie0;
1346   const dpo_id_t *dpo0;
1347   load_balance_t *lb0;
1348   u32 lbi0;
1349
1350   vnet_buffer (b)->ip.fib_index =
1351     vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1352     vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1353
1354   if (PREDICT_FALSE (last_check->first ||
1355                      (last_check->src.as_u32 != ip0->src_address.as_u32)))
1356     {
1357       mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1358       leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1359       leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1360       leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1361       lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1362
1363       vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1364       vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0;
1365
1366       lb0 = load_balance_get (lbi0);
1367       dpo0 = load_balance_get_bucket_i (lb0, 0);
1368
1369       /*
1370        * Must have a route to source otherwise we drop the packet.
1371        * ip4 broadcasts are accepted, e.g. to make dhcp client work
1372        *
1373        * The checks are:
1374        *  - the source is a recieve => it's from us => bogus, do this
1375        *    first since it sets a different error code.
1376        *  - uRPF check for any route to source - accept if passes.
1377        *  - allow packets destined to the broadcast address from unknown sources
1378        */
1379
1380       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1381                   && dpo0->dpoi_type == DPO_RECEIVE) ?
1382                  IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1383       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1384                   && !fib_urpf_check_size (lb0->lb_urpf)
1385                   && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1386                  IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1387
1388       last_check->src.as_u32 = ip0->src_address.as_u32;
1389       last_check->lbi = lbi0;
1390       last_check->error = *error0;
1391     }
1392   else
1393     {
1394       vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1395       vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi;
1396       *error0 = last_check->error;
1397       last_check->first = 0;
1398     }
1399 }
1400
1401 static inline void
1402 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1403                         ip4_local_last_check_t * last_check, u8 * error)
1404 {
1405   ip4_fib_mtrie_leaf_t leaf[2];
1406   ip4_fib_mtrie_t *mtrie[2];
1407   const dpo_id_t *dpo[2];
1408   load_balance_t *lb[2];
1409   u32 not_last_hit;
1410   u32 lbi[2];
1411
1412   not_last_hit = last_check->first;
1413   not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1414   not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1415
1416   vnet_buffer (b[0])->ip.fib_index =
1417     vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1418     vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1419     vnet_buffer (b[0])->ip.fib_index;
1420
1421   vnet_buffer (b[1])->ip.fib_index =
1422     vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1423     vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1424     vnet_buffer (b[1])->ip.fib_index;
1425
1426   if (PREDICT_FALSE (not_last_hit))
1427     {
1428       mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1429       mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1430
1431       leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1432       leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1433
1434       leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1435                                            &ip[0]->src_address, 2);
1436       leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1437                                            &ip[1]->src_address, 2);
1438
1439       leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1440                                            &ip[0]->src_address, 3);
1441       leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1442                                            &ip[1]->src_address, 3);
1443
1444       lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1445       lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1446
1447       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1448       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0];
1449
1450       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1451       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1];
1452
1453       lb[0] = load_balance_get (lbi[0]);
1454       lb[1] = load_balance_get (lbi[1]);
1455
1456       dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1457       dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1458
1459       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1460                    dpo[0]->dpoi_type == DPO_RECEIVE) ?
1461                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1462       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1463                    !fib_urpf_check_size (lb[0]->lb_urpf) &&
1464                    ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1465                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1466
1467       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1468                    dpo[1]->dpoi_type == DPO_RECEIVE) ?
1469                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1470       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1471                    !fib_urpf_check_size (lb[1]->lb_urpf) &&
1472                    ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1473                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1474
1475       last_check->src.as_u32 = ip[1]->src_address.as_u32;
1476       last_check->lbi = lbi[1];
1477       last_check->error = error[1];
1478     }
1479   else
1480     {
1481       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1482       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi;
1483
1484       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1485       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi;
1486
1487       error[0] = last_check->error;
1488       error[1] = last_check->error;
1489       last_check->first = 0;
1490     }
1491 }
1492
1493 enum ip_local_packet_type_e
1494 {
1495   IP_LOCAL_PACKET_TYPE_L4,
1496   IP_LOCAL_PACKET_TYPE_NAT,
1497   IP_LOCAL_PACKET_TYPE_FRAG,
1498 };
1499
1500 /**
1501  * Determine packet type and next node.
1502  *
1503  * The expectation is that all packets that are not L4 will skip
1504  * checksums and source checks.
1505  */
1506 always_inline u8
1507 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1508 {
1509   ip_lookup_main_t *lm = &ip4_main.lookup_main;
1510
1511   if (PREDICT_FALSE (ip4_is_fragment (ip)))
1512     {
1513       *next = IP_LOCAL_NEXT_REASSEMBLY;
1514       return IP_LOCAL_PACKET_TYPE_FRAG;
1515     }
1516   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1517     {
1518       *next = lm->local_next_by_ip_protocol[ip->protocol];
1519       return IP_LOCAL_PACKET_TYPE_NAT;
1520     }
1521
1522   *next = lm->local_next_by_ip_protocol[ip->protocol];
1523   return IP_LOCAL_PACKET_TYPE_L4;
1524 }
1525
1526 static inline uword
1527 ip4_local_inline (vlib_main_t * vm,
1528                   vlib_node_runtime_t * node,
1529                   vlib_frame_t * frame, int head_of_feature_arc)
1530 {
1531   u32 *from, n_left_from;
1532   vlib_node_runtime_t *error_node =
1533     vlib_node_get_runtime (vm, ip4_input_node.index);
1534   u16 nexts[VLIB_FRAME_SIZE], *next;
1535   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1536   ip4_header_t *ip[2];
1537   u8 error[2], pt[2];
1538
1539   ip4_local_last_check_t last_check = {
1540     /*
1541      * 0.0.0.0 can appear as the source address of an IP packet,
1542      * as can any other address, hence the need to use the 'first'
1543      * member to make sure the .lbi is initialised for the first
1544      * packet.
1545      */
1546     .src = {.as_u32 = 0},
1547     .lbi = ~0,
1548     .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1549     .first = 1,
1550   };
1551
1552   from = vlib_frame_vector_args (frame);
1553   n_left_from = frame->n_vectors;
1554
1555   if (node->flags & VLIB_NODE_FLAG_TRACE)
1556     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1557
1558   vlib_get_buffers (vm, from, bufs, n_left_from);
1559   b = bufs;
1560   next = nexts;
1561
1562   while (n_left_from >= 6)
1563     {
1564       u8 not_batch = 0;
1565
1566       /* Prefetch next iteration. */
1567       {
1568         vlib_prefetch_buffer_header (b[4], LOAD);
1569         vlib_prefetch_buffer_header (b[5], LOAD);
1570
1571         CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1572         CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1573       }
1574
1575       error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1576
1577       ip[0] = vlib_buffer_get_current (b[0]);
1578       ip[1] = vlib_buffer_get_current (b[1]);
1579
1580       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1581       vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1582
1583       pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1584       pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1585
1586       not_batch = pt[0] ^ pt[1];
1587
1588       if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1589         goto skip_checks;
1590
1591       if (PREDICT_TRUE (not_batch == 0))
1592         {
1593           ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1594           ip4_local_check_src_x2 (b, ip, &last_check, error);
1595         }
1596       else
1597         {
1598           if (!pt[0])
1599             {
1600               ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1601               ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1602             }
1603           if (!pt[1])
1604             {
1605               ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1606               ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1607             }
1608         }
1609
1610     skip_checks:
1611
1612       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1613                                     head_of_feature_arc);
1614       ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1615                                     head_of_feature_arc);
1616
1617       b += 2;
1618       next += 2;
1619       n_left_from -= 2;
1620     }
1621
1622   while (n_left_from > 0)
1623     {
1624       error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1625
1626       ip[0] = vlib_buffer_get_current (b[0]);
1627       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1628       pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1629
1630       if (head_of_feature_arc == 0 || pt[0])
1631         goto skip_check;
1632
1633       ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1634       ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1635
1636     skip_check:
1637
1638       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1639                                     head_of_feature_arc);
1640
1641       b += 1;
1642       next += 1;
1643       n_left_from -= 1;
1644     }
1645
1646   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1647   return frame->n_vectors;
1648 }
1649
1650 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1651                                vlib_frame_t * frame)
1652 {
1653   return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1654 }
1655
1656 /* *INDENT-OFF* */
1657 VLIB_REGISTER_NODE (ip4_local_node) =
1658 {
1659   .name = "ip4-local",
1660   .vector_size = sizeof (u32),
1661   .format_trace = format_ip4_forward_next_trace,
1662   .n_next_nodes = IP_LOCAL_N_NEXT,
1663   .next_nodes =
1664   {
1665     [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1666     [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1667     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1668     [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1669     [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly",
1670   },
1671 };
1672 /* *INDENT-ON* */
1673
1674
1675 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1676                                           vlib_node_runtime_t * node,
1677                                           vlib_frame_t * frame)
1678 {
1679   return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1680 }
1681
1682 /* *INDENT-OFF* */
1683 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1684   .name = "ip4-local-end-of-arc",
1685   .vector_size = sizeof (u32),
1686
1687   .format_trace = format_ip4_forward_next_trace,
1688   .sibling_of = "ip4-local",
1689 };
1690
1691 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1692   .arc_name = "ip4-local",
1693   .node_name = "ip4-local-end-of-arc",
1694   .runs_before = 0, /* not before any other features */
1695 };
1696 /* *INDENT-ON* */
1697
1698 #ifndef CLIB_MARCH_VARIANT
1699 void
1700 ip4_register_protocol (u32 protocol, u32 node_index)
1701 {
1702   vlib_main_t *vm = vlib_get_main ();
1703   ip4_main_t *im = &ip4_main;
1704   ip_lookup_main_t *lm = &im->lookup_main;
1705
1706   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1707   lm->local_next_by_ip_protocol[protocol] =
1708     vlib_node_add_next (vm, ip4_local_node.index, node_index);
1709 }
1710 #endif
1711
1712 static clib_error_t *
1713 show_ip_local_command_fn (vlib_main_t * vm,
1714                           unformat_input_t * input, vlib_cli_command_t * cmd)
1715 {
1716   ip4_main_t *im = &ip4_main;
1717   ip_lookup_main_t *lm = &im->lookup_main;
1718   int i;
1719
1720   vlib_cli_output (vm, "Protocols handled by ip4_local");
1721   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1722     {
1723       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1724         {
1725           u32 node_index = vlib_get_node (vm,
1726                                           ip4_local_node.index)->
1727             next_nodes[lm->local_next_by_ip_protocol[i]];
1728           vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1729                            node_index);
1730         }
1731     }
1732   return 0;
1733 }
1734
1735
1736
1737 /*?
1738  * Display the set of protocols handled by the local IPv4 stack.
1739  *
1740  * @cliexpar
1741  * Example of how to display local protocol table:
1742  * @cliexstart{show ip local}
1743  * Protocols handled by ip4_local
1744  * 1
1745  * 17
1746  * 47
1747  * @cliexend
1748 ?*/
1749 /* *INDENT-OFF* */
1750 VLIB_CLI_COMMAND (show_ip_local, static) =
1751 {
1752   .path = "show ip local",
1753   .function = show_ip_local_command_fn,
1754   .short_help = "show ip local",
1755 };
1756 /* *INDENT-ON* */
1757
1758 always_inline uword
1759 ip4_arp_inline (vlib_main_t * vm,
1760                 vlib_node_runtime_t * node,
1761                 vlib_frame_t * frame, int is_glean)
1762 {
1763   vnet_main_t *vnm = vnet_get_main ();
1764   ip4_main_t *im = &ip4_main;
1765   ip_lookup_main_t *lm = &im->lookup_main;
1766   u32 *from, *to_next_drop;
1767   uword n_left_from, n_left_to_next_drop, next_index;
1768   u32 thread_index = vm->thread_index;
1769   u64 seed;
1770
1771   if (node->flags & VLIB_NODE_FLAG_TRACE)
1772     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1773
1774   seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
1775
1776   from = vlib_frame_vector_args (frame);
1777   n_left_from = frame->n_vectors;
1778   next_index = node->cached_next_index;
1779   if (next_index == IP4_ARP_NEXT_DROP)
1780     next_index = IP4_ARP_N_NEXT;        /* point to first interface */
1781
1782   while (n_left_from > 0)
1783     {
1784       vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1785                            to_next_drop, n_left_to_next_drop);
1786
1787       while (n_left_from > 0 && n_left_to_next_drop > 0)
1788         {
1789           u32 pi0, bi0, adj_index0, sw_if_index0;
1790           ip_adjacency_t *adj0;
1791           vlib_buffer_t *p0, *b0;
1792           ip4_address_t resolve0;
1793           ethernet_arp_header_t *h0;
1794           vnet_hw_interface_t *hw_if0;
1795           u64 r0;
1796
1797           pi0 = from[0];
1798           p0 = vlib_get_buffer (vm, pi0);
1799
1800           from += 1;
1801           n_left_from -= 1;
1802           to_next_drop[0] = pi0;
1803           to_next_drop += 1;
1804           n_left_to_next_drop -= 1;
1805
1806           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1807           adj0 = adj_get (adj_index0);
1808
1809           if (is_glean)
1810             {
1811               /* resolve the packet's destination */
1812               ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1813               resolve0 = ip0->dst_address;
1814             }
1815           else
1816             {
1817               /* resolve the incomplete adj */
1818               resolve0 = adj0->sub_type.nbr.next_hop.ip4;
1819             }
1820
1821           /* combine the address and interface for the hash key */
1822           sw_if_index0 = adj0->rewrite_header.sw_if_index;
1823           r0 = (u64) resolve0.data_u32 << 32;
1824           r0 |= sw_if_index0;
1825
1826           if (throttle_check (&im->arp_throttle, thread_index, r0, seed))
1827             {
1828               p0->error = node->errors[IP4_ARP_ERROR_THROTTLED];
1829               continue;
1830             }
1831
1832           /*
1833            * the adj has been updated to a rewrite but the node the DPO that got
1834            * us here hasn't - yet. no big deal. we'll drop while we wait.
1835            */
1836           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1837             {
1838               p0->error = node->errors[IP4_ARP_ERROR_RESOLVED];
1839               continue;
1840             }
1841
1842           /*
1843            * Can happen if the control-plane is programming tables
1844            * with traffic flowing; at least that's today's lame excuse.
1845            */
1846           if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1847               || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1848             {
1849               p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1850               continue;
1851             }
1852           /* Send ARP request. */
1853           h0 =
1854             vlib_packet_template_get_packet (vm,
1855                                              &im->ip4_arp_request_packet_template,
1856                                              &bi0);
1857
1858           /* Seems we're out of buffers */
1859           if (PREDICT_FALSE (!h0))
1860             {
1861               p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS];
1862               continue;
1863             }
1864
1865           /* Add rewrite/encap string for ARP packet. */
1866           vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
1867
1868           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1869
1870           /* Src ethernet address in ARP header. */
1871           clib_memcpy_fast (h0->ip4_over_ethernet[0].ethernet,
1872                             hw_if0->hw_address,
1873                             sizeof (h0->ip4_over_ethernet[0].ethernet));
1874           if (is_glean)
1875             {
1876               /* The interface's source address is stashed in the Glean Adj */
1877               h0->ip4_over_ethernet[0].ip4 =
1878                 adj0->sub_type.glean.receive_addr.ip4;
1879             }
1880           else
1881             {
1882               /* Src IP address in ARP header. */
1883               if (ip4_src_address_for_packet (lm, sw_if_index0,
1884                                               &h0->ip4_over_ethernet[0].ip4))
1885                 {
1886                   /* No source address available */
1887                   p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1888                   vlib_buffer_free (vm, &bi0, 1);
1889                   continue;
1890                 }
1891             }
1892           h0->ip4_over_ethernet[1].ip4 = resolve0;
1893
1894           p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT];
1895
1896           vlib_buffer_copy_trace_flag (vm, p0, bi0);
1897           b0 = vlib_get_buffer (vm, bi0);
1898           VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1899           vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1900
1901           vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1902
1903           vlib_set_next_frame_buffer (vm, node,
1904                                       adj0->rewrite_header.next_index, bi0);
1905         }
1906
1907       vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1908     }
1909
1910   return frame->n_vectors;
1911 }
1912
1913 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1914                              vlib_frame_t * frame)
1915 {
1916   return (ip4_arp_inline (vm, node, frame, 0));
1917 }
1918
1919 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1920                                vlib_frame_t * frame)
1921 {
1922   return (ip4_arp_inline (vm, node, frame, 1));
1923 }
1924
1925 static char *ip4_arp_error_strings[] = {
1926   [IP4_ARP_ERROR_THROTTLED] = "ARP requests throttled",
1927   [IP4_ARP_ERROR_RESOLVED] = "ARP requests resolved",
1928   [IP4_ARP_ERROR_NO_BUFFERS] = "ARP requests out of buffer",
1929   [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1930   [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1931   [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1932 };
1933
1934 /* *INDENT-OFF* */
1935 VLIB_REGISTER_NODE (ip4_arp_node) =
1936 {
1937   .name = "ip4-arp",
1938   .vector_size = sizeof (u32),
1939   .format_trace = format_ip4_forward_next_trace,
1940   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1941   .error_strings = ip4_arp_error_strings,
1942   .n_next_nodes = IP4_ARP_N_NEXT,
1943   .next_nodes =
1944   {
1945     [IP4_ARP_NEXT_DROP] = "error-drop",
1946   },
1947 };
1948
1949 VLIB_REGISTER_NODE (ip4_glean_node) =
1950 {
1951   .name = "ip4-glean",
1952   .vector_size = sizeof (u32),
1953   .format_trace = format_ip4_forward_next_trace,
1954   .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1955   .error_strings = ip4_arp_error_strings,
1956   .n_next_nodes = IP4_ARP_N_NEXT,
1957   .next_nodes = {
1958   [IP4_ARP_NEXT_DROP] = "error-drop",
1959   },
1960 };
1961 /* *INDENT-ON* */
1962
1963 #define foreach_notrace_ip4_arp_error           \
1964 _(THROTTLED)                                    \
1965 _(RESOLVED)                                     \
1966 _(NO_BUFFERS)                                   \
1967 _(REQUEST_SENT)                                 \
1968 _(NON_ARP_ADJ)                                  \
1969 _(NO_SOURCE_ADDRESS)
1970
1971 static clib_error_t *
1972 arp_notrace_init (vlib_main_t * vm)
1973 {
1974   vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1975
1976   /* don't trace ARP request packets */
1977 #define _(a)                                    \
1978     vnet_pcap_drop_trace_filter_add_del         \
1979         (rt->errors[IP4_ARP_ERROR_##a],         \
1980          1 /* is_add */);
1981   foreach_notrace_ip4_arp_error;
1982 #undef _
1983   return 0;
1984 }
1985
1986 VLIB_INIT_FUNCTION (arp_notrace_init);
1987
1988
1989 #ifndef CLIB_MARCH_VARIANT
1990 /* Send an ARP request to see if given destination is reachable on given interface. */
1991 clib_error_t *
1992 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1993                     u8 refresh)
1994 {
1995   vnet_main_t *vnm = vnet_get_main ();
1996   ip4_main_t *im = &ip4_main;
1997   ethernet_arp_header_t *h;
1998   ip4_address_t *src;
1999   ip_interface_address_t *ia;
2000   ip_adjacency_t *adj;
2001   vnet_hw_interface_t *hi;
2002   vnet_sw_interface_t *si;
2003   vlib_buffer_t *b;
2004   adj_index_t ai;
2005   u32 bi = 0;
2006   u8 unicast_rewrite = 0;
2007
2008   si = vnet_get_sw_interface (vnm, sw_if_index);
2009
2010   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2011     {
2012       return clib_error_return (0, "%U: interface %U down",
2013                                 format_ip4_address, dst,
2014                                 format_vnet_sw_if_index_name, vnm,
2015                                 sw_if_index);
2016     }
2017
2018   src =
2019     ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2020   if (!src)
2021     {
2022       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2023       return clib_error_return
2024         (0,
2025          "no matching interface address for destination %U (interface %U)",
2026          format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2027          sw_if_index);
2028     }
2029
2030   h = vlib_packet_template_get_packet (vm,
2031                                        &im->ip4_arp_request_packet_template,
2032                                        &bi);
2033
2034   if (!h)
2035     return clib_error_return (0, "ARP request packet allocation failed");
2036
2037   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2038   if (PREDICT_FALSE (!hi->hw_address))
2039     {
2040       return clib_error_return (0, "%U: interface %U do not support ip probe",
2041                                 format_ip4_address, dst,
2042                                 format_vnet_sw_if_index_name, vnm,
2043                                 sw_if_index);
2044     }
2045
2046   clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2047                     sizeof (h->ip4_over_ethernet[0].ethernet));
2048
2049   h->ip4_over_ethernet[0].ip4 = src[0];
2050   h->ip4_over_ethernet[1].ip4 = dst[0];
2051
2052   b = vlib_get_buffer (vm, bi);
2053   vnet_buffer (b)->sw_if_index[VLIB_RX] =
2054     vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2055
2056   ip46_address_t nh = {
2057     .ip4 = *dst,
2058   };
2059
2060   ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2061                             VNET_LINK_IP4, &nh, sw_if_index);
2062   adj = adj_get (ai);
2063
2064   /* Peer has been previously resolved, retrieve glean adj instead */
2065   if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2066     {
2067       if (refresh)
2068         unicast_rewrite = 1;
2069       else
2070         {
2071           adj_unlock (ai);
2072           ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
2073                                       VNET_LINK_IP4, sw_if_index, &nh);
2074           adj = adj_get (ai);
2075         }
2076     }
2077
2078   /* Add encapsulation string for software interface (e.g. ethernet header). */
2079   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2080   if (unicast_rewrite)
2081     {
2082       u16 *etype = vlib_buffer_get_current (b) - 2;
2083       etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2084     }
2085   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2086
2087   {
2088     vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2089     u32 *to_next = vlib_frame_vector_args (f);
2090     to_next[0] = bi;
2091     f->n_vectors = 1;
2092     vlib_put_frame_to_node (vm, hi->output_node_index, f);
2093   }
2094
2095   adj_unlock (ai);
2096   return /* no error */ 0;
2097 }
2098 #endif
2099
2100 typedef enum
2101 {
2102   IP4_REWRITE_NEXT_DROP,
2103   IP4_REWRITE_NEXT_ICMP_ERROR,
2104   IP4_REWRITE_NEXT_FRAGMENT,
2105   IP4_REWRITE_N_NEXT            /* Last */
2106 } ip4_rewrite_next_t;
2107
2108 /**
2109  * This bits of an IPv4 address to mask to construct a multicast
2110  * MAC address
2111  */
2112 #if CLIB_ARCH_IS_BIG_ENDIAN
2113 #define IP4_MCAST_ADDR_MASK 0x007fffff
2114 #else
2115 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2116 #endif
2117
2118 always_inline void
2119 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2120                u16 adj_packet_bytes, bool df, u16 * next, u32 * error)
2121 {
2122   if (packet_len > adj_packet_bytes)
2123     {
2124       *error = IP4_ERROR_MTU_EXCEEDED;
2125       if (df)
2126         {
2127           icmp4_error_set_vnet_buffer
2128             (b, ICMP4_destination_unreachable,
2129              ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2130              adj_packet_bytes);
2131           *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2132         }
2133       else
2134         {
2135           /* IP fragmentation */
2136           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2137                                    IP4_FRAG_NEXT_IP4_REWRITE, 0);
2138           *next = IP4_REWRITE_NEXT_FRAGMENT;
2139         }
2140     }
2141 }
2142
2143 /* Decrement TTL & update checksum.
2144    Works either endian, so no need for byte swap. */
2145 static_always_inline void
2146 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2147                             u32 * error)
2148 {
2149   i32 ttl;
2150   u32 checksum;
2151   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2152     {
2153       b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2154       return;
2155     }
2156
2157   ttl = ip->ttl;
2158
2159   /* Input node should have reject packets with ttl 0. */
2160   ASSERT (ip->ttl > 0);
2161
2162   checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2163   checksum += checksum >= 0xffff;
2164
2165   ip->checksum = checksum;
2166   ttl -= 1;
2167   ip->ttl = ttl;
2168
2169   /*
2170    * If the ttl drops below 1 when forwarding, generate
2171    * an ICMP response.
2172    */
2173   if (PREDICT_FALSE (ttl <= 0))
2174     {
2175       *error = IP4_ERROR_TIME_EXPIRED;
2176       vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2177       icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2178                                    ICMP4_time_exceeded_ttl_exceeded_in_transit,
2179                                    0);
2180       *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2181     }
2182
2183   /* Verify checksum. */
2184   ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2185           (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2186 }
2187
2188
2189 always_inline uword
2190 ip4_rewrite_inline (vlib_main_t * vm,
2191                     vlib_node_runtime_t * node,
2192                     vlib_frame_t * frame,
2193                     int do_counters, int is_midchain, int is_mcast)
2194 {
2195   ip_lookup_main_t *lm = &ip4_main.lookup_main;
2196   u32 *from = vlib_frame_vector_args (frame);
2197   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2198   u16 nexts[VLIB_FRAME_SIZE], *next;
2199   u32 n_left_from;
2200   vlib_node_runtime_t *error_node =
2201     vlib_node_get_runtime (vm, ip4_input_node.index);
2202
2203   n_left_from = frame->n_vectors;
2204   u32 thread_index = vm->thread_index;
2205
2206   vlib_get_buffers (vm, from, bufs, n_left_from);
2207   clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2208
2209   if (n_left_from >= 6)
2210     {
2211       int i;
2212       for (i = 2; i < 6; i++)
2213         vlib_prefetch_buffer_header (bufs[i], LOAD);
2214     }
2215
2216   next = nexts;
2217   b = bufs;
2218   while (n_left_from >= 8)
2219     {
2220       ip_adjacency_t *adj0, *adj1;
2221       ip4_header_t *ip0, *ip1;
2222       u32 rw_len0, error0, adj_index0;
2223       u32 rw_len1, error1, adj_index1;
2224       u32 tx_sw_if_index0, tx_sw_if_index1;
2225       u8 *p;
2226
2227       vlib_prefetch_buffer_header (b[6], LOAD);
2228       vlib_prefetch_buffer_header (b[7], LOAD);
2229
2230       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2231       adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2232
2233       /*
2234        * pre-fetch the per-adjacency counters
2235        */
2236       if (do_counters)
2237         {
2238           vlib_prefetch_combined_counter (&adjacency_counters,
2239                                           thread_index, adj_index0);
2240           vlib_prefetch_combined_counter (&adjacency_counters,
2241                                           thread_index, adj_index1);
2242         }
2243
2244       ip0 = vlib_buffer_get_current (b[0]);
2245       ip1 = vlib_buffer_get_current (b[1]);
2246
2247       error0 = error1 = IP4_ERROR_NONE;
2248
2249       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2250       ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2251
2252       /* Rewrite packet header and updates lengths. */
2253       adj0 = adj_get (adj_index0);
2254       adj1 = adj_get (adj_index1);
2255
2256       /* Worth pipelining. No guarantee that adj0,1 are hot... */
2257       rw_len0 = adj0[0].rewrite_header.data_bytes;
2258       rw_len1 = adj1[0].rewrite_header.data_bytes;
2259       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2260       vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2261
2262       p = vlib_buffer_get_current (b[2]);
2263       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2264       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2265
2266       p = vlib_buffer_get_current (b[3]);
2267       CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2268       CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2269
2270       /* Check MTU of outgoing interface. */
2271       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2272                      adj0[0].rewrite_header.max_l3_packet_bytes,
2273                      ip0->flags_and_fragment_offset &
2274                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2275                      next + 0, &error0);
2276       ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
2277                      adj1[0].rewrite_header.max_l3_packet_bytes,
2278                      ip1->flags_and_fragment_offset &
2279                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2280                      next + 1, &error1);
2281
2282       if (is_mcast)
2283         {
2284           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2285                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2286                     IP4_ERROR_SAME_INTERFACE : error0);
2287           error1 = ((adj1[0].rewrite_header.sw_if_index ==
2288                      vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2289                     IP4_ERROR_SAME_INTERFACE : error1);
2290         }
2291
2292       b[0]->error = error_node->errors[error0];
2293       b[1]->error = error_node->errors[error1];
2294       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2295        * to see the IP headerr */
2296       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2297         {
2298           u32 next_index = adj0[0].rewrite_header.next_index;
2299           b[0]->current_data -= rw_len0;
2300           b[0]->current_length += rw_len0;
2301           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2302           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2303
2304           if (PREDICT_FALSE
2305               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2306             vnet_feature_arc_start (lm->output_feature_arc_index,
2307                                     tx_sw_if_index0, &next_index, b[0]);
2308           next[0] = next_index;
2309         }
2310       if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2311         {
2312           u32 next_index = adj1[0].rewrite_header.next_index;
2313           b[1]->current_data -= rw_len1;
2314           b[1]->current_length += rw_len1;
2315
2316           tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2317           vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2318
2319           if (PREDICT_FALSE
2320               (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2321             vnet_feature_arc_start (lm->output_feature_arc_index,
2322                                     tx_sw_if_index1, &next_index, b[1]);
2323           next[1] = next_index;
2324         }
2325
2326       /* Guess we are only writing on simple Ethernet header. */
2327       vnet_rewrite_two_headers (adj0[0], adj1[0],
2328                                 ip0, ip1, sizeof (ethernet_header_t));
2329
2330       /*
2331        * Bump the per-adjacency counters
2332        */
2333       if (do_counters)
2334         {
2335           vlib_increment_combined_counter
2336             (&adjacency_counters,
2337              thread_index,
2338              adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2339
2340           vlib_increment_combined_counter
2341             (&adjacency_counters,
2342              thread_index,
2343              adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2344         }
2345
2346       if (is_midchain)
2347         {
2348           adj0->sub_type.midchain.fixup_func
2349             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2350           adj1->sub_type.midchain.fixup_func
2351             (vm, adj1, b[1], adj1->sub_type.midchain.fixup_data);
2352         }
2353
2354       if (is_mcast)
2355         {
2356           /*
2357            * copy bytes from the IP address into the MAC rewrite
2358            */
2359           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2360                                       adj0->rewrite_header.dst_mcast_offset,
2361                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2362           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2363                                       adj1->rewrite_header.dst_mcast_offset,
2364                                       &ip1->dst_address.as_u32, (u8 *) ip1);
2365         }
2366
2367       next += 2;
2368       b += 2;
2369       n_left_from -= 2;
2370     }
2371
2372   while (n_left_from > 0)
2373     {
2374       ip_adjacency_t *adj0;
2375       ip4_header_t *ip0;
2376       u32 rw_len0, adj_index0, error0;
2377       u32 tx_sw_if_index0;
2378
2379       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2380
2381       adj0 = adj_get (adj_index0);
2382
2383       if (do_counters)
2384         vlib_prefetch_combined_counter (&adjacency_counters,
2385                                         thread_index, adj_index0);
2386
2387       ip0 = vlib_buffer_get_current (b[0]);
2388
2389       error0 = IP4_ERROR_NONE;
2390
2391       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2392
2393
2394       /* Update packet buffer attributes/set output interface. */
2395       rw_len0 = adj0[0].rewrite_header.data_bytes;
2396       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2397
2398       /* Check MTU of outgoing interface. */
2399       ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2400                      adj0[0].rewrite_header.max_l3_packet_bytes,
2401                      ip0->flags_and_fragment_offset &
2402                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2403                      next + 0, &error0);
2404
2405       if (is_mcast)
2406         {
2407           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2408                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2409                     IP4_ERROR_SAME_INTERFACE : error0);
2410         }
2411       b[0]->error = error_node->errors[error0];
2412
2413       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2414        * to see the IP headerr */
2415       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2416         {
2417           u32 next_index = adj0[0].rewrite_header.next_index;
2418           b[0]->current_data -= rw_len0;
2419           b[0]->current_length += rw_len0;
2420           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2421           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2422
2423           if (PREDICT_FALSE
2424               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2425             vnet_feature_arc_start (lm->output_feature_arc_index,
2426                                     tx_sw_if_index0, &next_index, b[0]);
2427           next[0] = next_index;
2428         }
2429
2430       /* Guess we are only writing on simple Ethernet header. */
2431       vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2432
2433       if (do_counters)
2434         vlib_increment_combined_counter
2435           (&adjacency_counters,
2436            thread_index, adj_index0, 1,
2437            vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2438
2439       if (is_midchain)
2440         {
2441           adj0->sub_type.midchain.fixup_func
2442             (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2443         }
2444
2445       if (is_mcast)
2446         {
2447           /*
2448            * copy bytes from the IP address into the MAC rewrite
2449            */
2450           vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2451                                       adj0->rewrite_header.dst_mcast_offset,
2452                                       &ip0->dst_address.as_u32, (u8 *) ip0);
2453         }
2454
2455       next += 1;
2456       b += 1;
2457       n_left_from -= 1;
2458     }
2459
2460
2461   /* Need to do trace after rewrites to pick up new packet data. */
2462   if (node->flags & VLIB_NODE_FLAG_TRACE)
2463     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2464
2465   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2466   return frame->n_vectors;
2467 }
2468
2469
2470 /** @brief IPv4 rewrite node.
2471     @node ip4-rewrite
2472
2473     This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2474     header checksum, fetch the ip adjacency, check the outbound mtu,
2475     apply the adjacency rewrite, and send pkts to the adjacency
2476     rewrite header's rewrite_next_index.
2477
2478     @param vm vlib_main_t corresponding to the current thread
2479     @param node vlib_node_runtime_t
2480     @param frame vlib_frame_t whose contents should be dispatched
2481
2482     @par Graph mechanics: buffer metadata, next index usage
2483
2484     @em Uses:
2485     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2486         - the rewrite adjacency index
2487     - <code>adj->lookup_next_index</code>
2488         - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2489           the packet will be dropped.
2490     - <code>adj->rewrite_header</code>
2491         - Rewrite string length, rewrite string, next_index
2492
2493     @em Sets:
2494     - <code>b->current_data, b->current_length</code>
2495         - Updated net of applying the rewrite string
2496
2497     <em>Next Indices:</em>
2498     - <code> adj->rewrite_header.next_index </code>
2499       or @c ip4-drop
2500 */
2501
2502 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2503                                  vlib_frame_t * frame)
2504 {
2505   if (adj_are_counters_enabled ())
2506     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2507   else
2508     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2509 }
2510
2511 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2512                                        vlib_node_runtime_t * node,
2513                                        vlib_frame_t * frame)
2514 {
2515   if (adj_are_counters_enabled ())
2516     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2517   else
2518     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2519 }
2520
2521 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2522                                   vlib_node_runtime_t * node,
2523                                   vlib_frame_t * frame)
2524 {
2525   if (adj_are_counters_enabled ())
2526     return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2527   else
2528     return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2529 }
2530
2531 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2532                                        vlib_node_runtime_t * node,
2533                                        vlib_frame_t * frame)
2534 {
2535   if (adj_are_counters_enabled ())
2536     return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2537   else
2538     return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2539 }
2540
2541 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2542                                         vlib_node_runtime_t * node,
2543                                         vlib_frame_t * frame)
2544 {
2545   if (adj_are_counters_enabled ())
2546     return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2547   else
2548     return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2549 }
2550
2551 /* *INDENT-OFF* */
2552 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2553   .name = "ip4-rewrite",
2554   .vector_size = sizeof (u32),
2555
2556   .format_trace = format_ip4_rewrite_trace,
2557
2558   .n_next_nodes = IP4_REWRITE_N_NEXT,
2559   .next_nodes = {
2560     [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2561     [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2562     [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2563   },
2564 };
2565
2566 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2567   .name = "ip4-rewrite-bcast",
2568   .vector_size = sizeof (u32),
2569
2570   .format_trace = format_ip4_rewrite_trace,
2571   .sibling_of = "ip4-rewrite",
2572 };
2573
2574 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2575   .name = "ip4-rewrite-mcast",
2576   .vector_size = sizeof (u32),
2577
2578   .format_trace = format_ip4_rewrite_trace,
2579   .sibling_of = "ip4-rewrite",
2580 };
2581
2582 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2583   .name = "ip4-mcast-midchain",
2584   .vector_size = sizeof (u32),
2585
2586   .format_trace = format_ip4_rewrite_trace,
2587   .sibling_of = "ip4-rewrite",
2588 };
2589
2590 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2591   .name = "ip4-midchain",
2592   .vector_size = sizeof (u32),
2593   .format_trace = format_ip4_forward_next_trace,
2594   .sibling_of =  "ip4-rewrite",
2595 };
2596 /* *INDENT-ON */
2597
2598 static int
2599 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2600 {
2601   ip4_fib_mtrie_t *mtrie0;
2602   ip4_fib_mtrie_leaf_t leaf0;
2603   u32 lbi0;
2604
2605   mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2606
2607   leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2608   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2609   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2610
2611   lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2612
2613   return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2614 }
2615
2616 static clib_error_t *
2617 test_lookup_command_fn (vlib_main_t * vm,
2618                         unformat_input_t * input, vlib_cli_command_t * cmd)
2619 {
2620   ip4_fib_t *fib;
2621   u32 table_id = 0;
2622   f64 count = 1;
2623   u32 n;
2624   int i;
2625   ip4_address_t ip4_base_address;
2626   u64 errors = 0;
2627
2628   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2629     {
2630       if (unformat (input, "table %d", &table_id))
2631         {
2632           /* Make sure the entry exists. */
2633           fib = ip4_fib_get (table_id);
2634           if ((fib) && (fib->index != table_id))
2635             return clib_error_return (0, "<fib-index> %d does not exist",
2636                                       table_id);
2637         }
2638       else if (unformat (input, "count %f", &count))
2639         ;
2640
2641       else if (unformat (input, "%U",
2642                          unformat_ip4_address, &ip4_base_address))
2643         ;
2644       else
2645         return clib_error_return (0, "unknown input `%U'",
2646                                   format_unformat_error, input);
2647     }
2648
2649   n = count;
2650
2651   for (i = 0; i < n; i++)
2652     {
2653       if (!ip4_lookup_validate (&ip4_base_address, table_id))
2654         errors++;
2655
2656       ip4_base_address.as_u32 =
2657         clib_host_to_net_u32 (1 +
2658                               clib_net_to_host_u32 (ip4_base_address.as_u32));
2659     }
2660
2661   if (errors)
2662     vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2663   else
2664     vlib_cli_output (vm, "No errors in %d lookups\n", n);
2665
2666   return 0;
2667 }
2668
2669 /*?
2670  * Perform a lookup of an IPv4 Address (or range of addresses) in the
2671  * given FIB table to determine if there is a conflict with the
2672  * adjacency table. The fib-id can be determined by using the
2673  * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2674  * of 0 is used.
2675  *
2676  * @todo This command uses fib-id, other commands use table-id (not
2677  * just a name, they are different indexes). Would like to change this
2678  * to table-id for consistency.
2679  *
2680  * @cliexpar
2681  * Example of how to run the test lookup command:
2682  * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2683  * No errors in 2 lookups
2684  * @cliexend
2685 ?*/
2686 /* *INDENT-OFF* */
2687 VLIB_CLI_COMMAND (lookup_test_command, static) =
2688 {
2689   .path = "test lookup",
2690   .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2691   .function = test_lookup_command_fn,
2692 };
2693 /* *INDENT-ON* */
2694
2695 #ifndef CLIB_MARCH_VARIANT
2696 int
2697 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2698 {
2699   u32 fib_index;
2700
2701   fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2702
2703   if (~0 == fib_index)
2704     return VNET_API_ERROR_NO_SUCH_FIB;
2705
2706   fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2707                                   flow_hash_config);
2708
2709   return 0;
2710 }
2711 #endif
2712
2713 static clib_error_t *
2714 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2715                              unformat_input_t * input,
2716                              vlib_cli_command_t * cmd)
2717 {
2718   int matched = 0;
2719   u32 table_id = 0;
2720   u32 flow_hash_config = 0;
2721   int rv;
2722
2723   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2724     {
2725       if (unformat (input, "table %d", &table_id))
2726         matched = 1;
2727 #define _(a,v) \
2728     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2729       foreach_flow_hash_bit
2730 #undef _
2731         else
2732         break;
2733     }
2734
2735   if (matched == 0)
2736     return clib_error_return (0, "unknown input `%U'",
2737                               format_unformat_error, input);
2738
2739   rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2740   switch (rv)
2741     {
2742     case 0:
2743       break;
2744
2745     case VNET_API_ERROR_NO_SUCH_FIB:
2746       return clib_error_return (0, "no such FIB table %d", table_id);
2747
2748     default:
2749       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2750       break;
2751     }
2752
2753   return 0;
2754 }
2755
2756 /*?
2757  * Configure the set of IPv4 fields used by the flow hash.
2758  *
2759  * @cliexpar
2760  * Example of how to set the flow hash on a given table:
2761  * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2762  * Example of display the configured flow hash:
2763  * @cliexstart{show ip fib}
2764  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2765  * 0.0.0.0/0
2766  *   unicast-ip4-chain
2767  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2768  *     [0] [@0]: dpo-drop ip6
2769  * 0.0.0.0/32
2770  *   unicast-ip4-chain
2771  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2772  *     [0] [@0]: dpo-drop ip6
2773  * 224.0.0.0/8
2774  *   unicast-ip4-chain
2775  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2776  *     [0] [@0]: dpo-drop ip6
2777  * 6.0.1.2/32
2778  *   unicast-ip4-chain
2779  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2780  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2781  * 7.0.0.1/32
2782  *   unicast-ip4-chain
2783  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2784  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2785  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2786  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2787  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2788  * 240.0.0.0/8
2789  *   unicast-ip4-chain
2790  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2791  *     [0] [@0]: dpo-drop ip6
2792  * 255.255.255.255/32
2793  *   unicast-ip4-chain
2794  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2795  *     [0] [@0]: dpo-drop ip6
2796  * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2797  * 0.0.0.0/0
2798  *   unicast-ip4-chain
2799  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2800  *     [0] [@0]: dpo-drop ip6
2801  * 0.0.0.0/32
2802  *   unicast-ip4-chain
2803  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2804  *     [0] [@0]: dpo-drop ip6
2805  * 172.16.1.0/24
2806  *   unicast-ip4-chain
2807  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2808  *     [0] [@4]: ipv4-glean: af_packet0
2809  * 172.16.1.1/32
2810  *   unicast-ip4-chain
2811  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2812  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2813  * 172.16.1.2/32
2814  *   unicast-ip4-chain
2815  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2816  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2817  * 172.16.2.0/24
2818  *   unicast-ip4-chain
2819  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2820  *     [0] [@4]: ipv4-glean: af_packet1
2821  * 172.16.2.1/32
2822  *   unicast-ip4-chain
2823  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2824  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2825  * 224.0.0.0/8
2826  *   unicast-ip4-chain
2827  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2828  *     [0] [@0]: dpo-drop ip6
2829  * 240.0.0.0/8
2830  *   unicast-ip4-chain
2831  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2832  *     [0] [@0]: dpo-drop ip6
2833  * 255.255.255.255/32
2834  *   unicast-ip4-chain
2835  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2836  *     [0] [@0]: dpo-drop ip6
2837  * @cliexend
2838 ?*/
2839 /* *INDENT-OFF* */
2840 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2841 {
2842   .path = "set ip flow-hash",
2843   .short_help =
2844   "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2845   .function = set_ip_flow_hash_command_fn,
2846 };
2847 /* *INDENT-ON* */
2848
2849 #ifndef CLIB_MARCH_VARIANT
2850 int
2851 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2852                              u32 table_index)
2853 {
2854   vnet_main_t *vnm = vnet_get_main ();
2855   vnet_interface_main_t *im = &vnm->interface_main;
2856   ip4_main_t *ipm = &ip4_main;
2857   ip_lookup_main_t *lm = &ipm->lookup_main;
2858   vnet_classify_main_t *cm = &vnet_classify_main;
2859   ip4_address_t *if_addr;
2860
2861   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2862     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2863
2864   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2865     return VNET_API_ERROR_NO_SUCH_ENTRY;
2866
2867   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2868   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2869
2870   if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2871
2872   if (NULL != if_addr)
2873     {
2874       fib_prefix_t pfx = {
2875         .fp_len = 32,
2876         .fp_proto = FIB_PROTOCOL_IP4,
2877         .fp_addr.ip4 = *if_addr,
2878       };
2879       u32 fib_index;
2880
2881       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2882                                                        sw_if_index);
2883
2884
2885       if (table_index != (u32) ~ 0)
2886         {
2887           dpo_id_t dpo = DPO_INVALID;
2888
2889           dpo_set (&dpo,
2890                    DPO_CLASSIFY,
2891                    DPO_PROTO_IP4,
2892                    classify_dpo_create (DPO_PROTO_IP4, table_index));
2893
2894           fib_table_entry_special_dpo_add (fib_index,
2895                                            &pfx,
2896                                            FIB_SOURCE_CLASSIFY,
2897                                            FIB_ENTRY_FLAG_NONE, &dpo);
2898           dpo_reset (&dpo);
2899         }
2900       else
2901         {
2902           fib_table_entry_special_remove (fib_index,
2903                                           &pfx, FIB_SOURCE_CLASSIFY);
2904         }
2905     }
2906
2907   return 0;
2908 }
2909 #endif
2910
2911 static clib_error_t *
2912 set_ip_classify_command_fn (vlib_main_t * vm,
2913                             unformat_input_t * input,
2914                             vlib_cli_command_t * cmd)
2915 {
2916   u32 table_index = ~0;
2917   int table_index_set = 0;
2918   u32 sw_if_index = ~0;
2919   int rv;
2920
2921   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2922     {
2923       if (unformat (input, "table-index %d", &table_index))
2924         table_index_set = 1;
2925       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2926                          vnet_get_main (), &sw_if_index))
2927         ;
2928       else
2929         break;
2930     }
2931
2932   if (table_index_set == 0)
2933     return clib_error_return (0, "classify table-index must be specified");
2934
2935   if (sw_if_index == ~0)
2936     return clib_error_return (0, "interface / subif must be specified");
2937
2938   rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2939
2940   switch (rv)
2941     {
2942     case 0:
2943       break;
2944
2945     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2946       return clib_error_return (0, "No such interface");
2947
2948     case VNET_API_ERROR_NO_SUCH_ENTRY:
2949       return clib_error_return (0, "No such classifier table");
2950     }
2951   return 0;
2952 }
2953
2954 /*?
2955  * Assign a classification table to an interface. The classification
2956  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2957  * commands. Once the table is create, use this command to filter packets
2958  * on an interface.
2959  *
2960  * @cliexpar
2961  * Example of how to assign a classification table to an interface:
2962  * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2963 ?*/
2964 /* *INDENT-OFF* */
2965 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2966 {
2967     .path = "set ip classify",
2968     .short_help =
2969     "set ip classify intfc <interface> table-index <classify-idx>",
2970     .function = set_ip_classify_command_fn,
2971 };
2972 /* *INDENT-ON* */
2973
2974 static clib_error_t *
2975 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2976 {
2977   ip4_main_t *im = &ip4_main;
2978   uword heapsize = 0;
2979
2980   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2981     {
2982       if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2983         ;
2984       else
2985         return clib_error_return (0,
2986                                   "invalid heap-size parameter `%U'",
2987                                   format_unformat_error, input);
2988     }
2989
2990   im->mtrie_heap_size = heapsize;
2991
2992   return 0;
2993 }
2994
2995 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2996
2997 /*
2998  * fd.io coding-style-patch-verification: ON
2999  *
3000  * Local Variables:
3001  * eval: (c-set-style "gnu")
3002  * End:
3003  */