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/mfib/ip4_mfib.h>
  53 #include <vnet/dpo/load_balance.h>
  54 #include <vnet/dpo/load_balance_map.h>
  55 #include <vnet/dpo/receive_dpo.h>
  56 #include <vnet/dpo/classify_dpo.h>
  57 #include <vnet/mfib/mfib_table.h>       /* for mFIB table and entry creation */
  58 #include <vnet/adj/adj_dp.h>
  59 #include <vnet/pg/pg.h>
  60
  61 #include <vnet/ip/ip4_forward.h>
  62 #include <vnet/interface_output.h>
  63 #include <vnet/classify/vnet_classify.h>
  64 #include <vnet/ip/reass/ip4_full_reass.h>
  65
  66 /** @brief IPv4 lookup node.
  67     @node ip4-lookup
  68
  69     This is the main IPv4 lookup dispatch node.
  70
  71     @param vm vlib_main_t corresponding to the current thread
  72     @param node vlib_node_runtime_t
  73     @param frame vlib_frame_t whose contents should be dispatched
  74
  75     @par Graph mechanics: buffer metadata, next index usage
  76
  77     @em Uses:
  78     - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
  79         - Indicates the @c sw_if_index value of the interface that the
  80           packet was received on.
  81     - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
  82         - When the value is @c ~0 then the node performs a longest prefix
  83           match (LPM) for the packet destination address in the FIB attached
  84           to the receive interface.
  85         - Otherwise perform LPM for the packet destination address in the
  86           indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
  87           value (0, 1, ...) and not a VRF id.
  88
  89     @em Sets:
  90     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
  91         - The lookup result adjacency index.
  92
  93     <em>Next Index:</em>
  94     - Dispatches the packet to the node index found in
  95       ip_adjacency_t @c adj->lookup_next_index
  96       (where @c adj is the lookup result adjacency).
  97 */
  98 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
  99                                 vlib_frame_t * frame)
 100 {
 101   return ip4_lookup_inline (vm, node, frame);
 102 }
 103
 104 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
 105
 106 /* *INDENT-OFF* */
 107 VLIB_REGISTER_NODE (ip4_lookup_node) =
 108 {
 109   .name = "ip4-lookup",
 110   .vector_size = sizeof (u32),
 111   .format_trace = format_ip4_lookup_trace,
 112   .n_next_nodes = IP_LOOKUP_N_NEXT,
 113   .next_nodes = IP4_LOOKUP_NEXT_NODES,
 114 };
 115 /* *INDENT-ON* */
 116
 117 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
 118                                       vlib_node_runtime_t * node,
 119                                       vlib_frame_t * frame)
 120 {
 121   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
 122   u32 n_left, *from;
 123   u32 thread_index = vm->thread_index;
 124   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 125   u16 nexts[VLIB_FRAME_SIZE], *next;
 126
 127   from = vlib_frame_vector_args (frame);
 128   n_left = frame->n_vectors;
 129   next = nexts;
 130
 131   vlib_get_buffers (vm, from, bufs, n_left);
 132
 133   while (n_left >= 4)
 134     {
 135       const load_balance_t *lb0, *lb1;
 136       const ip4_header_t *ip0, *ip1;
 137       u32 lbi0, hc0, lbi1, hc1;
 138       const dpo_id_t *dpo0, *dpo1;
 139
 140       /* Prefetch next iteration. */
 141       {
 142         vlib_prefetch_buffer_header (b[2], LOAD);
 143         vlib_prefetch_buffer_header (b[3], LOAD);
 144
 145         CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), LOAD);
 146         CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), LOAD);
 147       }
 148
 149       ip0 = vlib_buffer_get_current (b[0]);
 150       ip1 = vlib_buffer_get_current (b[1]);
 151       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 152       lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
 153
 154       lb0 = load_balance_get (lbi0);
 155       lb1 = load_balance_get (lbi1);
 156
 157       /*
 158        * this node is for via FIBs we can re-use the hash value from the
 159        * to node if present.
 160        * We don't want to use the same hash value at each level in the recursion
 161        * graph as that would lead to polarisation
 162        */
 163       hc0 = hc1 = 0;
 164
 165       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 166         {
 167           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 168             {
 169               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 170                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 171             }
 172           else
 173             {
 174               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 175                 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 176             }
 177           dpo0 = load_balance_get_fwd_bucket
 178             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 179         }
 180       else
 181         {
 182           dpo0 = load_balance_get_bucket_i (lb0, 0);
 183         }
 184       if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 185         {
 186           if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
 187             {
 188               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 189                 vnet_buffer (b[1])->ip.flow_hash >> 1;
 190             }
 191           else
 192             {
 193               hc1 = vnet_buffer (b[1])->ip.flow_hash =
 194                 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
 195             }
 196           dpo1 = load_balance_get_fwd_bucket
 197             (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
 198         }
 199       else
 200         {
 201           dpo1 = load_balance_get_bucket_i (lb1, 0);
 202         }
 203
 204       next[0] = dpo0->dpoi_next_node;
 205       next[1] = dpo1->dpoi_next_node;
 206
 207       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 208       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 209
 210       vlib_increment_combined_counter
 211         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 212       vlib_increment_combined_counter
 213         (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
 214
 215       b += 2;
 216       next += 2;
 217       n_left -= 2;
 218     }
 219
 220   while (n_left > 0)
 221     {
 222       const load_balance_t *lb0;
 223       const ip4_header_t *ip0;
 224       const dpo_id_t *dpo0;
 225       u32 lbi0, hc0;
 226
 227       ip0 = vlib_buffer_get_current (b[0]);
 228       lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
 229
 230       lb0 = load_balance_get (lbi0);
 231
 232       hc0 = 0;
 233       if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 234         {
 235           if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
 236             {
 237               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 238                 vnet_buffer (b[0])->ip.flow_hash >> 1;
 239             }
 240           else
 241             {
 242               hc0 = vnet_buffer (b[0])->ip.flow_hash =
 243                 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
 244             }
 245           dpo0 = load_balance_get_fwd_bucket
 246             (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
 247         }
 248       else
 249         {
 250           dpo0 = load_balance_get_bucket_i (lb0, 0);
 251         }
 252
 253       next[0] = dpo0->dpoi_next_node;
 254       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 255
 256       vlib_increment_combined_counter
 257         (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
 258
 259       b += 1;
 260       next += 1;
 261       n_left -= 1;
 262     }
 263
 264   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 265   if (node->flags & VLIB_NODE_FLAG_TRACE)
 266     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 267
 268   return frame->n_vectors;
 269 }
 270
 271 /* *INDENT-OFF* */
 272 VLIB_REGISTER_NODE (ip4_load_balance_node) =
 273 {
 274   .name = "ip4-load-balance",
 275   .vector_size = sizeof (u32),
 276   .sibling_of = "ip4-lookup",
 277   .format_trace = format_ip4_lookup_trace,
 278 };
 279 /* *INDENT-ON* */
 280
 281 #ifndef CLIB_MARCH_VARIANT
 282 /* get first interface address */
 283 ip4_address_t *
 284 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
 285                              ip_interface_address_t ** result_ia)
 286 {
 287   ip_lookup_main_t *lm = &im->lookup_main;
 288   ip_interface_address_t *ia = 0;
 289   ip4_address_t *result = 0;
 290
 291   /* *INDENT-OFF* */
 292   foreach_ip_interface_address
 293     (lm, ia, sw_if_index,
 294      1 /* honor unnumbered */ ,
 295      ({
 296        ip4_address_t * a =
 297          ip_interface_address_get_address (lm, ia);
 298        result = a;
 299        break;
 300      }));
 301   /* *INDENT-OFF* */
 302   if (result_ia)
 303     *result_ia = result ? ia : 0;
 304   return result;
 305 }
 306 #endif
 307
 308 static void
 309 ip4_add_subnet_bcast_route (u32 fib_index,
 310                             fib_prefix_t *pfx,
 311                             u32 sw_if_index)
 312 {
 313   vnet_sw_interface_flags_t iflags;
 314
 315   iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
 316
 317   fib_table_entry_special_remove(fib_index,
 318                                  pfx,
 319                                  FIB_SOURCE_INTERFACE);
 320
 321   if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
 322     {
 323       fib_table_entry_update_one_path (fib_index, pfx,
 324                                        FIB_SOURCE_INTERFACE,
 325                                        FIB_ENTRY_FLAG_NONE,
 326                                        DPO_PROTO_IP4,
 327                                        /* No next-hop address */
 328                                        &ADJ_BCAST_ADDR,
 329                                        sw_if_index,
 330                                        // invalid FIB index
 331                                        ~0,
 332                                        1,
 333                                        // no out-label stack
 334                                        NULL,
 335                                        FIB_ROUTE_PATH_FLAG_NONE);
 336     }
 337   else
 338     {
 339         fib_table_entry_special_add(fib_index,
 340                                     pfx,
 341                                     FIB_SOURCE_INTERFACE,
 342                                     (FIB_ENTRY_FLAG_DROP |
 343                                      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
 344     }
 345 }
 346
 347 static void
 348 ip4_add_interface_prefix_routes (ip4_main_t *im,
 349                                  u32 sw_if_index,
 350                                  u32 fib_index,
 351                                  ip_interface_address_t * a)
 352 {
 353   ip_lookup_main_t *lm = &im->lookup_main;
 354   ip_interface_prefix_t *if_prefix;
 355   ip4_address_t *address = ip_interface_address_get_address (lm, a);
 356
 357   ip_interface_prefix_key_t key = {
 358     .prefix = {
 359       .fp_len = a->address_length,
 360       .fp_proto = FIB_PROTOCOL_IP4,
 361       .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[a->address_length],
 362     },
 363     .sw_if_index = sw_if_index,
 364   };
 365
 366   fib_prefix_t pfx_special = {
 367     .fp_proto = FIB_PROTOCOL_IP4,
 368   };
 369
 370   /* If prefix already set on interface, just increment ref count & return */
 371   if_prefix = ip_get_interface_prefix (lm, &key);
 372   if (if_prefix)
 373     {
 374       if_prefix->ref_count += 1;
 375       return;
 376     }
 377
 378   /* New prefix - allocate a pool entry, initialize it, add to the hash */
 379   pool_get (lm->if_prefix_pool, if_prefix);
 380   if_prefix->ref_count = 1;
 381   if_prefix->src_ia_index = a - lm->if_address_pool;
 382   clib_memcpy (&if_prefix->key, &key, sizeof (key));
 383   mhash_set (&lm->prefix_to_if_prefix_index, &key,
 384              if_prefix - lm->if_prefix_pool, 0 /* old value */);
 385
 386   pfx_special.fp_len = a->address_length;
 387   pfx_special.fp_addr.ip4.as_u32 = address->as_u32;
 388
 389   /* set the glean route for the prefix */
 390   fib_table_entry_update_one_path (fib_index, &pfx_special,
 391                                    FIB_SOURCE_INTERFACE,
 392                                    (FIB_ENTRY_FLAG_CONNECTED |
 393                                     FIB_ENTRY_FLAG_ATTACHED),
 394                                    DPO_PROTO_IP4,
 395                                    /* No next-hop address */
 396                                    NULL,
 397                                    sw_if_index,
 398                                    /* invalid FIB index */
 399                                    ~0,
 400                                    1,
 401                                    /* no out-label stack */
 402                                    NULL,
 403                                    FIB_ROUTE_PATH_FLAG_NONE);
 404
 405   /* length <= 30 - add glean, drop first address, maybe drop bcast address */
 406   if (a->address_length <= 30)
 407     {
 408       /* set a drop route for the base address of the prefix */
 409       pfx_special.fp_len = 32;
 410       pfx_special.fp_addr.ip4.as_u32 =
 411         address->as_u32 & im->fib_masks[a->address_length];
 412
 413       if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
 414         fib_table_entry_special_add (fib_index, &pfx_special,
 415                                      FIB_SOURCE_INTERFACE,
 416                                      (FIB_ENTRY_FLAG_DROP |
 417                                       FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
 418
 419       /* set a route for the broadcast address of the prefix */
 420       pfx_special.fp_len = 32;
 421       pfx_special.fp_addr.ip4.as_u32 =
 422         address->as_u32 | ~im->fib_masks[a->address_length];
 423       if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
 424         ip4_add_subnet_bcast_route (fib_index, &pfx_special, sw_if_index);
 425
 426
 427     }
 428   /* length == 31 - add an attached route for the other address */
 429   else if (a->address_length == 31)
 430     {
 431       pfx_special.fp_len = 32;
 432       pfx_special.fp_addr.ip4.as_u32 =
 433         address->as_u32 ^ clib_host_to_net_u32(1);
 434
 435       fib_table_entry_update_one_path (fib_index, &pfx_special,
 436                                        FIB_SOURCE_INTERFACE,
 437                                        (FIB_ENTRY_FLAG_ATTACHED),
 438                                        DPO_PROTO_IP4,
 439                                        &pfx_special.fp_addr,
 440                                        sw_if_index,
 441                                        /* invalid FIB index */
 442                                        ~0,
 443                                        1,
 444                                        NULL,
 445                                        FIB_ROUTE_PATH_FLAG_NONE);
 446     }
 447 }
 448
 449 static void
 450 ip4_add_interface_routes (u32 sw_if_index,
 451                           ip4_main_t * im, u32 fib_index,
 452                           ip_interface_address_t * a)
 453 {
 454   ip_lookup_main_t *lm = &im->lookup_main;
 455   ip4_address_t *address = ip_interface_address_get_address (lm, a);
 456   fib_prefix_t pfx = {
 457     .fp_len = 32,
 458     .fp_proto = FIB_PROTOCOL_IP4,
 459     .fp_addr.ip4 = *address,
 460   };
 461
 462   /* set special routes for the prefix if needed */
 463   ip4_add_interface_prefix_routes (im, sw_if_index, fib_index, a);
 464
 465   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 466     {
 467       u32 classify_table_index =
 468         lm->classify_table_index_by_sw_if_index[sw_if_index];
 469       if (classify_table_index != (u32) ~ 0)
 470         {
 471           dpo_id_t dpo = DPO_INVALID;
 472
 473           dpo_set (&dpo,
 474                    DPO_CLASSIFY,
 475                    DPO_PROTO_IP4,
 476                    classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
 477
 478           fib_table_entry_special_dpo_add (fib_index,
 479                                            &pfx,
 480                                            FIB_SOURCE_CLASSIFY,
 481                                            FIB_ENTRY_FLAG_NONE, &dpo);
 482           dpo_reset (&dpo);
 483         }
 484     }
 485
 486   fib_table_entry_update_one_path (fib_index, &pfx,
 487                                    FIB_SOURCE_INTERFACE,
 488                                    (FIB_ENTRY_FLAG_CONNECTED |
 489                                     FIB_ENTRY_FLAG_LOCAL),
 490                                    DPO_PROTO_IP4,
 491                                    &pfx.fp_addr,
 492                                    sw_if_index,
 493                                    // invalid FIB index
 494                                    ~0,
 495                                    1, NULL,
 496                                    FIB_ROUTE_PATH_FLAG_NONE);
 497 }
 498
 499 static void
 500 ip4_del_interface_prefix_routes (ip4_main_t * im,
 501                                  u32 sw_if_index,
 502                                  u32 fib_index,
 503                                  ip4_address_t * address,
 504                                  u32 address_length)
 505 {
 506   ip_lookup_main_t *lm = &im->lookup_main;
 507   ip_interface_prefix_t *if_prefix;
 508
 509   ip_interface_prefix_key_t key = {
 510     .prefix = {
 511       .fp_len = address_length,
 512       .fp_proto = FIB_PROTOCOL_IP4,
 513       .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[address_length],
 514     },
 515     .sw_if_index = sw_if_index,
 516   };
 517
 518   fib_prefix_t pfx_special = {
 519     .fp_len = 32,
 520     .fp_proto = FIB_PROTOCOL_IP4,
 521   };
 522
 523   if_prefix = ip_get_interface_prefix (lm, &key);
 524   if (!if_prefix)
 525     {
 526       clib_warning ("Prefix not found while deleting %U",
 527                     format_ip4_address_and_length, address, address_length);
 528       return;
 529     }
 530
 531   if_prefix->ref_count -= 1;
 532
 533   /*
 534    * Routes need to be adjusted if deleting last intf addr in prefix
 535    *
 536    * We're done now otherwise
 537    */
 538   if (if_prefix->ref_count > 0)
 539     return;
 540
 541   /* length <= 30, delete glean route, first address, last address */
 542   if (address_length <= 30)
 543     {
 544       /* Less work to do in FIB if we remove the covered /32s first */
 545
 546       /* first address in prefix */
 547       pfx_special.fp_addr.ip4.as_u32 =
 548         address->as_u32 & im->fib_masks[address_length];
 549       pfx_special.fp_len = 32;
 550
 551       if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
 552         fib_table_entry_special_remove (fib_index,
 553                                         &pfx_special,
 554                                         FIB_SOURCE_INTERFACE);
 555
 556       /* prefix broadcast address */
 557       pfx_special.fp_addr.ip4.as_u32 =
 558         address->as_u32 | ~im->fib_masks[address_length];
 559       pfx_special.fp_len = 32;
 560
 561       if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
 562         fib_table_entry_special_remove (fib_index,
 563                                         &pfx_special,
 564                                         FIB_SOURCE_INTERFACE);
 565     }
 566   else if (address_length == 31)
 567     {
 568       /* length == 31, delete attached route for the other address */
 569       pfx_special.fp_addr.ip4.as_u32 =
 570         address->as_u32 ^ clib_host_to_net_u32(1);
 571
 572       fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
 573     }
 574
 575   /* remove glean route for prefix */
 576   pfx_special.fp_addr.ip4 = *address;
 577   pfx_special.fp_len = address_length;
 578   fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
 579
 580   mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */);
 581   pool_put (lm->if_prefix_pool, if_prefix);
 582 }
 583
 584 static void
 585 ip4_del_interface_routes (u32 sw_if_index,
 586                           ip4_main_t * im,
 587                           u32 fib_index,
 588                           ip4_address_t * address, u32 address_length)
 589 {
 590   fib_prefix_t pfx = {
 591     .fp_len = 32,
 592     .fp_proto = FIB_PROTOCOL_IP4,
 593     .fp_addr.ip4 = *address,
 594   };
 595
 596   fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
 597
 598   ip4_del_interface_prefix_routes (im, sw_if_index, fib_index,
 599                                    address, address_length);
 600 }
 601
 602 #ifndef CLIB_MARCH_VARIANT
 603 void
 604 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 605 {
 606   ip4_main_t *im = &ip4_main;
 607   vnet_main_t *vnm = vnet_get_main ();
 608   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 609
 610   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 611
 612   /*
 613    * enable/disable only on the 1<->0 transition
 614    */
 615   if (is_enable)
 616     {
 617       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 618         return;
 619     }
 620   else
 621     {
 622       ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
 623       if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 624         return;
 625     }
 626   vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
 627                                !is_enable, 0, 0);
 628
 629
 630   vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
 631                                sw_if_index, !is_enable, 0, 0);
 632
 633   if (is_enable)
 634     hi->l3_if_count++;
 635   else if (hi->l3_if_count)
 636     hi->l3_if_count--;
 637
 638   {
 639     ip4_enable_disable_interface_callback_t *cb;
 640     vec_foreach (cb, im->enable_disable_interface_callbacks)
 641       cb->function (im, cb->function_opaque, sw_if_index, is_enable);
 642   }
 643 }
 644
 645 static clib_error_t *
 646 ip4_add_del_interface_address_internal (vlib_main_t * vm,
 647                                         u32 sw_if_index,
 648                                         ip4_address_t * address,
 649                                         u32 address_length, u32 is_del)
 650 {
 651   vnet_main_t *vnm = vnet_get_main ();
 652   ip4_main_t *im = &ip4_main;
 653   ip_lookup_main_t *lm = &im->lookup_main;
 654   clib_error_t *error = 0;
 655   u32 if_address_index;
 656   ip4_address_fib_t ip4_af, *addr_fib = 0;
 657
 658   error = vnet_sw_interface_supports_addressing (vnm, sw_if_index);
 659   if (error)
 660     {
 661       vnm->api_errno = VNET_API_ERROR_UNSUPPORTED;
 662       return error;
 663     }
 664
 665   ip4_addr_fib_init (&ip4_af, address,
 666                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 667   vec_add1 (addr_fib, ip4_af);
 668
 669   /*
 670    * there is no support for adj-fib handling in the presence of overlapping
 671    * subnets on interfaces. Easy fix - disallow overlapping subnets, like
 672    * most routers do.
 673    */
 674   /* *INDENT-OFF* */
 675   if (!is_del)
 676     {
 677       /* When adding an address check that it does not conflict
 678          with an existing address on any interface in this table. */
 679       ip_interface_address_t *ia;
 680       vnet_sw_interface_t *sif;
 681
 682       pool_foreach (sif, vnm->interface_main.sw_interfaces)
 683        {
 684           if (im->fib_index_by_sw_if_index[sw_if_index] ==
 685               im->fib_index_by_sw_if_index[sif->sw_if_index])
 686             {
 687               foreach_ip_interface_address
 688                 (&im->lookup_main, ia, sif->sw_if_index,
 689                  0 /* honor unnumbered */ ,
 690                  ({
 691                    ip4_address_t * x =
 692                      ip_interface_address_get_address
 693                      (&im->lookup_main, ia);
 694
 695                    if (ip4_destination_matches_route
 696                        (im, address, x, ia->address_length) ||
 697                        ip4_destination_matches_route (im,
 698                                                       x,
 699                                                       address,
 700                                                       address_length))
 701                      {
 702                        /* an intf may have >1 addr from the same prefix */
 703                        if ((sw_if_index == sif->sw_if_index) &&
 704                            (ia->address_length == address_length) &&
 705                            (x->as_u32 != address->as_u32))
 706                          continue;
 707
 708                        if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 709                          /* if the address we're comparing against is stale
 710                           * then the CP has not added this one back yet, maybe
 711                           * it never will, so we have to assume it won't and
 712                           * ignore it. if it does add it back, then it will fail
 713                           * because this one is now present */
 714                          continue;
 715
 716                        /* error if the length or intf was different */
 717                        vnm->api_errno = VNET_API_ERROR_ADDRESS_IN_USE;
 718
 719                        error = clib_error_create
 720                          ("failed to add %U on %U which conflicts with %U for interface %U",
 721                           format_ip4_address_and_length, address,
 722                           address_length,
 723                           format_vnet_sw_if_index_name, vnm,
 724                           sw_if_index,
 725                           format_ip4_address_and_length, x,
 726                           ia->address_length,
 727                           format_vnet_sw_if_index_name, vnm,
 728                           sif->sw_if_index);
 729                        goto done;
 730                      }
 731                  }));
 732             }
 733       }
 734     }
 735   /* *INDENT-ON* */
 736
 737   if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
 738
 739   if (is_del)
 740     {
 741       if (~0 == if_address_index)
 742         {
 743           vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
 744           error = clib_error_create ("%U not found for interface %U",
 745                                      lm->format_address_and_length,
 746                                      addr_fib, address_length,
 747                                      format_vnet_sw_if_index_name, vnm,
 748                                      sw_if_index);
 749           goto done;
 750         }
 751
 752       error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
 753                                         address_length, sw_if_index);
 754       if (error)
 755         goto done;
 756     }
 757   else
 758     {
 759       if (~0 != if_address_index)
 760         {
 761           ip_interface_address_t *ia;
 762
 763           ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
 764
 765           if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 766             {
 767               if (ia->sw_if_index == sw_if_index)
 768                 {
 769                   /* re-adding an address during the replace action.
 770                    * consdier this the update. clear the flag and
 771                    * we're done */
 772                   ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
 773                   goto done;
 774                 }
 775               else
 776                 {
 777                   /* The prefix is moving from one interface to another.
 778                    * delete the stale and add the new */
 779                   ip4_add_del_interface_address_internal (vm,
 780                                                           ia->sw_if_index,
 781                                                           address,
 782                                                           address_length, 1);
 783                   ia = NULL;
 784                   error = ip_interface_address_add (lm, sw_if_index,
 785                                                     addr_fib, address_length,
 786                                                     &if_address_index);
 787                 }
 788             }
 789           else
 790             {
 791               vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
 792               error = clib_error_create
 793                 ("Prefix %U already found on interface %U",
 794                  lm->format_address_and_length, addr_fib, address_length,
 795                  format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
 796             }
 797         }
 798       else
 799         error = ip_interface_address_add (lm, sw_if_index,
 800                                           addr_fib, address_length,
 801                                           &if_address_index);
 802     }
 803
 804   if (error)
 805     goto done;
 806
 807   ip4_sw_interface_enable_disable (sw_if_index, !is_del);
 808   ip4_mfib_interface_enable_disable (sw_if_index, !is_del);
 809
 810   /* intf addr routes are added/deleted on admin up/down */
 811   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
 812     {
 813       if (is_del)
 814         ip4_del_interface_routes (sw_if_index,
 815                                   im, ip4_af.fib_index, address,
 816                                   address_length);
 817       else
 818         ip4_add_interface_routes (sw_if_index,
 819                                   im, ip4_af.fib_index,
 820                                   pool_elt_at_index
 821                                   (lm->if_address_pool, if_address_index));
 822     }
 823
 824   ip4_add_del_interface_address_callback_t *cb;
 825   vec_foreach (cb, im->add_del_interface_address_callbacks)
 826     cb->function (im, cb->function_opaque, sw_if_index,
 827                   address, address_length, if_address_index, is_del);
 828
 829 done:
 830   vec_free (addr_fib);
 831   return error;
 832 }
 833
 834 clib_error_t *
 835 ip4_add_del_interface_address (vlib_main_t * vm,
 836                                u32 sw_if_index,
 837                                ip4_address_t * address,
 838                                u32 address_length, u32 is_del)
 839 {
 840   return ip4_add_del_interface_address_internal
 841     (vm, sw_if_index, address, address_length, is_del);
 842 }
 843
 844 void
 845 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
 846 {
 847   ip_interface_address_t *ia;
 848   ip4_main_t *im;
 849
 850   im = &ip4_main;
 851
 852   /*
 853    * when directed broadcast is enabled, the subnet braodcast route will forward
 854    * packets using an adjacency with a broadcast MAC. otherwise it drops
 855    */
 856   /* *INDENT-OFF* */
 857   foreach_ip_interface_address(&im->lookup_main, ia,
 858                                sw_if_index, 0,
 859      ({
 860        if (ia->address_length <= 30)
 861          {
 862            ip4_address_t *ipa;
 863
 864            ipa = ip_interface_address_get_address (&im->lookup_main, ia);
 865
 866            fib_prefix_t pfx = {
 867              .fp_len = 32,
 868              .fp_proto = FIB_PROTOCOL_IP4,
 869              .fp_addr = {
 870                .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
 871              },
 872            };
 873
 874            ip4_add_subnet_bcast_route
 875              (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
 876                                                   sw_if_index),
 877               &pfx, sw_if_index);
 878          }
 879      }));
 880   /* *INDENT-ON* */
 881 }
 882 #endif
 883
 884 static clib_error_t *
 885 ip4_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 886 {
 887   ip4_main_t *im = &ip4_main;
 888   ip_interface_address_t *ia;
 889   ip4_address_t *a;
 890   u32 is_admin_up, fib_index;
 891
 892   vec_validate_init_empty (im->
 893                            lookup_main.if_address_pool_index_by_sw_if_index,
 894                            sw_if_index, ~0);
 895
 896   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 897
 898   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 899
 900   /* *INDENT-OFF* */
 901   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 902                                 0 /* honor unnumbered */,
 903   ({
 904     a = ip_interface_address_get_address (&im->lookup_main, ia);
 905     if (is_admin_up)
 906       ip4_add_interface_routes (sw_if_index,
 907                                 im, fib_index,
 908                                 ia);
 909     else
 910       ip4_del_interface_routes (sw_if_index,
 911                                 im, fib_index,
 912                                 a, ia->address_length);
 913   }));
 914   /* *INDENT-ON* */
 915
 916   return 0;
 917 }
 918
 919 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
 920
 921 /* Built-in ip4 unicast rx feature path definition */
 922 /* *INDENT-OFF* */
 923 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
 924 {
 925   .arc_name = "ip4-unicast",
 926   .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
 927   .last_in_arc = "ip4-lookup",
 928   .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
 929 };
 930
 931 VNET_FEATURE_INIT (ip4_flow_classify, static) =
 932 {
 933   .arc_name = "ip4-unicast",
 934   .node_name = "ip4-flow-classify",
 935   .runs_before = VNET_FEATURES ("ip4-inacl"),
 936 };
 937
 938 VNET_FEATURE_INIT (ip4_inacl, static) =
 939 {
 940   .arc_name = "ip4-unicast",
 941   .node_name = "ip4-inacl",
 942   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 943 };
 944
 945 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
 946 {
 947   .arc_name = "ip4-unicast",
 948   .node_name = "ip4-source-and-port-range-check-rx",
 949   .runs_before = VNET_FEATURES ("ip4-policer-classify"),
 950 };
 951
 952 VNET_FEATURE_INIT (ip4_policer_classify, static) =
 953 {
 954   .arc_name = "ip4-unicast",
 955   .node_name = "ip4-policer-classify",
 956   .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
 957 };
 958
 959 VNET_FEATURE_INIT (ip4_ipsec, static) =
 960 {
 961   .arc_name = "ip4-unicast",
 962   .node_name = "ipsec4-input-feature",
 963   .runs_before = VNET_FEATURES ("vpath-input-ip4"),
 964 };
 965
 966 VNET_FEATURE_INIT (ip4_vpath, static) =
 967 {
 968   .arc_name = "ip4-unicast",
 969   .node_name = "vpath-input-ip4",
 970   .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
 971 };
 972
 973 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
 974 {
 975   .arc_name = "ip4-unicast",
 976   .node_name = "ip4-vxlan-bypass",
 977   .runs_before = VNET_FEATURES ("ip4-lookup"),
 978 };
 979
 980 VNET_FEATURE_INIT (ip4_not_enabled, static) =
 981 {
 982   .arc_name = "ip4-unicast",
 983   .node_name = "ip4-not-enabled",
 984   .runs_before = VNET_FEATURES ("ip4-lookup"),
 985 };
 986
 987 VNET_FEATURE_INIT (ip4_lookup, static) =
 988 {
 989   .arc_name = "ip4-unicast",
 990   .node_name = "ip4-lookup",
 991   .runs_before = 0,     /* not before any other features */
 992 };
 993
 994 /* Built-in ip4 multicast rx feature path definition */
 995 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
 996 {
 997   .arc_name = "ip4-multicast",
 998   .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
 999   .last_in_arc = "ip4-mfib-forward-lookup",
1000   .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1001 };
1002
1003 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1004 {
1005   .arc_name = "ip4-multicast",
1006   .node_name = "vpath-input-ip4",
1007   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1008 };
1009
1010 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
1011 {
1012   .arc_name = "ip4-multicast",
1013   .node_name = "ip4-not-enabled",
1014   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1015 };
1016
1017 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1018 {
1019   .arc_name = "ip4-multicast",
1020   .node_name = "ip4-mfib-forward-lookup",
1021   .runs_before = 0,     /* last feature */
1022 };
1023
1024 /* Source and port-range check ip4 tx feature path definition */
1025 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1026 {
1027   .arc_name = "ip4-output",
1028   .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
1029   .last_in_arc = "interface-output",
1030   .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1031 };
1032
1033 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1034 {
1035   .arc_name = "ip4-output",
1036   .node_name = "ip4-source-and-port-range-check-tx",
1037   .runs_before = VNET_FEATURES ("ip4-outacl"),
1038 };
1039
1040 VNET_FEATURE_INIT (ip4_outacl, static) =
1041 {
1042   .arc_name = "ip4-output",
1043   .node_name = "ip4-outacl",
1044   .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
1045 };
1046
1047 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1048 {
1049   .arc_name = "ip4-output",
1050   .node_name = "ipsec4-output-feature",
1051   .runs_before = VNET_FEATURES ("interface-output"),
1052 };
1053
1054 /* Built-in ip4 tx feature path definition */
1055 VNET_FEATURE_INIT (ip4_interface_output, static) =
1056 {
1057   .arc_name = "ip4-output",
1058   .node_name = "interface-output",
1059   .runs_before = 0,     /* not before any other features */
1060 };
1061 /* *INDENT-ON* */
1062
1063 static clib_error_t *
1064 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1065 {
1066   ip4_main_t *im = &ip4_main;
1067
1068   vec_validate_init_empty (im->fib_index_by_sw_if_index, sw_if_index, ~0);
1069   vec_validate_init_empty (im->mfib_index_by_sw_if_index, sw_if_index, ~0);
1070
1071   if (is_add)
1072     {
1073       /* Fill in lookup tables with default table (0). */
1074       im->fib_index_by_sw_if_index[sw_if_index] = 0;
1075       im->mfib_index_by_sw_if_index[sw_if_index] = 0;
1076     }
1077   else
1078     {
1079       ip4_main_t *im4 = &ip4_main;
1080       ip_lookup_main_t *lm4 = &im4->lookup_main;
1081       ip_interface_address_t *ia = 0;
1082       ip4_address_t *address;
1083       vlib_main_t *vm = vlib_get_main ();
1084
1085       vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
1086       /* *INDENT-OFF* */
1087       foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
1088       ({
1089         address = ip_interface_address_get_address (lm4, ia);
1090         ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1091       }));
1092       /* *INDENT-ON* */
1093       ip4_mfib_interface_enable_disable (sw_if_index, 0);
1094
1095       if (0 != im4->fib_index_by_sw_if_index[sw_if_index])
1096         fib_table_bind (FIB_PROTOCOL_IP4, sw_if_index, 0);
1097       if (0 != im4->mfib_index_by_sw_if_index[sw_if_index])
1098         mfib_table_bind (FIB_PROTOCOL_IP4, sw_if_index, 0);
1099
1100       /* Erase the lookup tables just in case */
1101       im4->fib_index_by_sw_if_index[sw_if_index] = ~0;
1102       im4->mfib_index_by_sw_if_index[sw_if_index] = ~0;
1103     }
1104
1105   vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
1106                                is_add, 0, 0);
1107
1108   vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
1109                                sw_if_index, is_add, 0, 0);
1110
1111   return /* no error */ 0;
1112 }
1113
1114 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1115
1116 /* Global IP4 main. */
1117 #ifndef CLIB_MARCH_VARIANT
1118 ip4_main_t ip4_main;
1119 #endif /* CLIB_MARCH_VARIANT */
1120
1121 static clib_error_t *
1122 ip4_lookup_init (vlib_main_t * vm)
1123 {
1124   ip4_main_t *im = &ip4_main;
1125   clib_error_t *error;
1126   uword i;
1127
1128   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1129     return error;
1130   if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
1131     return (error);
1132   if ((error = vlib_call_init_function (vm, fib_module_init)))
1133     return error;
1134   if ((error = vlib_call_init_function (vm, mfib_module_init)))
1135     return error;
1136
1137   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1138     {
1139       u32 m;
1140
1141       if (i < 32)
1142         m = pow2_mask (i) << (32 - i);
1143       else
1144         m = ~0;
1145       im->fib_masks[i] = clib_host_to_net_u32 (m);
1146     }
1147
1148   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1149
1150   /* Create FIB with index 0 and table id of 0. */
1151   fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1152                                      FIB_SOURCE_DEFAULT_ROUTE);
1153   mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1154                                       MFIB_SOURCE_DEFAULT_ROUTE);
1155
1156   {
1157     pg_node_t *pn;
1158     pn = pg_get_node (ip4_lookup_node.index);
1159     pn->unformat_edit = unformat_pg_ip4_header;
1160   }
1161
1162   {
1163     ethernet_arp_header_t h;
1164
1165     clib_memset (&h, 0, sizeof (h));
1166
1167 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1168 #define _8(f,v) h.f = v;
1169     _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1170     _16 (l3_type, ETHERNET_TYPE_IP4);
1171     _8 (n_l2_address_bytes, 6);
1172     _8 (n_l3_address_bytes, 4);
1173     _16 (opcode, ETHERNET_ARP_OPCODE_request);
1174 #undef _16
1175 #undef _8
1176
1177     vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1178                                /* data */ &h,
1179                                sizeof (h),
1180                                /* alloc chunk size */ 8,
1181                                "ip4 arp");
1182   }
1183
1184   return error;
1185 }
1186
1187 VLIB_INIT_FUNCTION (ip4_lookup_init);
1188
1189 typedef struct
1190 {
1191   /* Adjacency taken. */
1192   u32 dpo_index;
1193   u32 flow_hash;
1194   u32 fib_index;
1195
1196   /* Packet data, possibly *after* rewrite. */
1197   u8 packet_data[64 - 1 * sizeof (u32)];
1198 }
1199 ip4_forward_next_trace_t;
1200
1201 #ifndef CLIB_MARCH_VARIANT
1202 u8 *
1203 format_ip4_forward_next_trace (u8 * s, va_list * args)
1204 {
1205   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1206   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1207   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1208   u32 indent = format_get_indent (s);
1209   s = format (s, "%U%U",
1210               format_white_space, indent,
1211               format_ip4_header, t->packet_data, sizeof (t->packet_data));
1212   return s;
1213 }
1214 #endif
1215
1216 static u8 *
1217 format_ip4_lookup_trace (u8 * s, va_list * args)
1218 {
1219   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1220   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1221   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1222   u32 indent = format_get_indent (s);
1223
1224   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1225               t->fib_index, t->dpo_index, t->flow_hash);
1226   s = format (s, "\n%U%U",
1227               format_white_space, indent,
1228               format_ip4_header, t->packet_data, sizeof (t->packet_data));
1229   return s;
1230 }
1231
1232 static u8 *
1233 format_ip4_rewrite_trace (u8 * s, va_list * args)
1234 {
1235   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1236   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1237   ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1238   u32 indent = format_get_indent (s);
1239
1240   s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1241               t->fib_index, t->dpo_index, format_ip_adjacency,
1242               t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1243   s = format (s, "\n%U%U",
1244               format_white_space, indent,
1245               format_ip_adjacency_packet_data,
1246               t->packet_data, sizeof (t->packet_data));
1247   return s;
1248 }
1249
1250 #ifndef CLIB_MARCH_VARIANT
1251 /* Common trace function for all ip4-forward next nodes. */
1252 void
1253 ip4_forward_next_trace (vlib_main_t * vm,
1254                         vlib_node_runtime_t * node,
1255                         vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1256 {
1257   u32 *from, n_left;
1258   ip4_main_t *im = &ip4_main;
1259
1260   n_left = frame->n_vectors;
1261   from = vlib_frame_vector_args (frame);
1262
1263   while (n_left >= 4)
1264     {
1265       u32 bi0, bi1;
1266       vlib_buffer_t *b0, *b1;
1267       ip4_forward_next_trace_t *t0, *t1;
1268
1269       /* Prefetch next iteration. */
1270       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1271       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1272
1273       bi0 = from[0];
1274       bi1 = from[1];
1275
1276       b0 = vlib_get_buffer (vm, bi0);
1277       b1 = vlib_get_buffer (vm, bi1);
1278
1279       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1280         {
1281           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1282           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1283           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1284           t0->fib_index =
1285             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1286              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1287             vec_elt (im->fib_index_by_sw_if_index,
1288                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1289
1290           clib_memcpy_fast (t0->packet_data,
1291                             vlib_buffer_get_current (b0),
1292                             sizeof (t0->packet_data));
1293         }
1294       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1295         {
1296           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1297           t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1298           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1299           t1->fib_index =
1300             (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1301              (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1302             vec_elt (im->fib_index_by_sw_if_index,
1303                      vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1304           clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1305                             sizeof (t1->packet_data));
1306         }
1307       from += 2;
1308       n_left -= 2;
1309     }
1310
1311   while (n_left >= 1)
1312     {
1313       u32 bi0;
1314       vlib_buffer_t *b0;
1315       ip4_forward_next_trace_t *t0;
1316
1317       bi0 = from[0];
1318
1319       b0 = vlib_get_buffer (vm, bi0);
1320
1321       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1322         {
1323           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1324           t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1325           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1326           t0->fib_index =
1327             (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1328              (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1329             vec_elt (im->fib_index_by_sw_if_index,
1330                      vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1331           clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1332                             sizeof (t0->packet_data));
1333         }
1334       from += 1;
1335       n_left -= 1;
1336     }
1337 }
1338
1339 /* Compute TCP/UDP/ICMP4 checksum in software. */
1340 u16
1341 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1342                               ip4_header_t * ip0)
1343 {
1344   ip_csum_t sum0;
1345   u32 ip_header_length, payload_length_host_byte_order;
1346
1347   /* Initialize checksum with ip header. */
1348   ip_header_length = ip4_header_bytes (ip0);
1349   payload_length_host_byte_order =
1350     clib_net_to_host_u16 (ip0->length) - ip_header_length;
1351   sum0 =
1352     clib_host_to_net_u32 (payload_length_host_byte_order +
1353                           (ip0->protocol << 16));
1354
1355   if (BITS (uword) == 32)
1356     {
1357       sum0 =
1358         ip_csum_with_carry (sum0,
1359                             clib_mem_unaligned (&ip0->src_address, u32));
1360       sum0 =
1361         ip_csum_with_carry (sum0,
1362                             clib_mem_unaligned (&ip0->dst_address, u32));
1363     }
1364   else
1365     sum0 =
1366       ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1367
1368   return ip_calculate_l4_checksum (vm, p0, sum0,
1369                                    payload_length_host_byte_order, (u8 *) ip0,
1370                                    ip_header_length, NULL);
1371 }
1372
1373 u32
1374 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1375 {
1376   ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1377   udp_header_t *udp0;
1378   u16 sum16;
1379
1380   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1381           || ip0->protocol == IP_PROTOCOL_UDP);
1382
1383   udp0 = (void *) (ip0 + 1);
1384   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1385     {
1386       p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1387                     | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1388       return p0->flags;
1389     }
1390
1391   sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1392
1393   p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1394                 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1395
1396   return p0->flags;
1397 }
1398 #endif
1399
1400 /* *INDENT-OFF* */
1401 VNET_FEATURE_ARC_INIT (ip4_local) = {
1402   .arc_name = "ip4-local",
1403   .start_nodes = VNET_FEATURES ("ip4-local", "ip4-receive"),
1404   .last_in_arc = "ip4-local-end-of-arc",
1405 };
1406 /* *INDENT-ON* */
1407
1408 static inline void
1409 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1410                             ip4_header_t * ip, u8 is_udp, u8 * error,
1411                             u8 * good_tcp_udp)
1412 {
1413   u32 flags0;
1414   flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1415   *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1416   if (is_udp)
1417     {
1418       udp_header_t *udp;
1419       u32 ip_len, udp_len;
1420       i32 len_diff;
1421       udp = ip4_next_header (ip);
1422       /* Verify UDP length. */
1423       ip_len = clib_net_to_host_u16 (ip->length);
1424       udp_len = clib_net_to_host_u16 (udp->length);
1425
1426       len_diff = ip_len - udp_len;
1427       *good_tcp_udp &= len_diff >= 0;
1428       *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1429     }
1430 }
1431
1432 #define ip4_local_csum_is_offloaded(_b)                                       \
1433   ((_b->flags & VNET_BUFFER_F_OFFLOAD) &&                                     \
1434    (vnet_buffer (_b)->oflags &                                                \
1435     (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM | VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)))
1436
1437 #define ip4_local_need_csum_check(is_tcp_udp, _b)                       \
1438     (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED     \
1439         || ip4_local_csum_is_offloaded (_b)))
1440
1441 #define ip4_local_csum_is_valid(_b)                                     \
1442     (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT                      \
1443         || (ip4_local_csum_is_offloaded (_b))) != 0
1444
1445 static inline void
1446 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1447                          ip4_header_t * ih, u8 * error)
1448 {
1449   u8 is_udp, is_tcp_udp, good_tcp_udp;
1450
1451   is_udp = ih->protocol == IP_PROTOCOL_UDP;
1452   is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1453
1454   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1455     ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1456   else
1457     good_tcp_udp = ip4_local_csum_is_valid (b);
1458
1459   ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1460   *error = (is_tcp_udp && !good_tcp_udp
1461             ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1462 }
1463
1464 static inline void
1465 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1466                             ip4_header_t ** ih, u8 * error)
1467 {
1468   u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1469
1470   is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1471   is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1472
1473   is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1474   is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1475
1476   good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1477   good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1478
1479   if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1480                      || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1481     {
1482       if (is_tcp_udp[0])
1483         ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1484                                     &good_tcp_udp[0]);
1485       if (is_tcp_udp[1])
1486         ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1487                                     &good_tcp_udp[1]);
1488     }
1489
1490   error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1491               IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1492   error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1493               IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1494 }
1495
1496 static inline void
1497 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1498                               vlib_buffer_t * b, u16 * next, u8 error,
1499                               u8 head_of_feature_arc)
1500 {
1501   u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1502   u32 next_index;
1503
1504   *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1505   b->error = error ? error_node->errors[error] : 0;
1506   if (head_of_feature_arc)
1507     {
1508       next_index = *next;
1509       if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1510         {
1511           vnet_feature_arc_start (
1512             arc_index, vnet_buffer (b)->ip.rx_sw_if_index, &next_index, b);
1513           *next = next_index;
1514         }
1515     }
1516 }
1517
1518 typedef struct
1519 {
1520   ip4_address_t src;
1521   u32 lbi;
1522   u8 error;
1523   u8 first;
1524 } ip4_local_last_check_t;
1525
1526 static inline void
1527 ip4_local_check_src (vlib_buffer_t *b, ip4_header_t *ip0,
1528                      ip4_local_last_check_t *last_check, u8 *error0,
1529                      int is_receive_dpo)
1530 {
1531   const dpo_id_t *dpo0;
1532   load_balance_t *lb0;
1533   u32 lbi0;
1534
1535   vnet_buffer (b)->ip.fib_index =
1536     vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1537     vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1538
1539   if (is_receive_dpo)
1540     {
1541       receive_dpo_t *rd;
1542       rd = receive_dpo_get (vnet_buffer (b)->ip.adj_index[VLIB_TX]);
1543       vnet_buffer (b)->ip.rx_sw_if_index = rd->rd_sw_if_index;
1544     }
1545   else
1546     vnet_buffer (b)->ip.rx_sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1547
1548   /*
1549    * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1550    *  adjacency for the destination address (the local interface address).
1551    * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1552    *  adjacency for the source address (the remote sender's address)
1553    */
1554   if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) ||
1555       last_check->first)
1556     {
1557       lbi0 = ip4_fib_forwarding_lookup (vnet_buffer (b)->ip.fib_index,
1558                                         &ip0->src_address);
1559
1560       vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1561         vnet_buffer (b)->ip.adj_index[VLIB_TX];
1562       vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1563
1564       lb0 = load_balance_get (lbi0);
1565       dpo0 = load_balance_get_bucket_i (lb0, 0);
1566
1567       /*
1568        * Must have a route to source otherwise we drop the packet.
1569        * ip4 broadcasts are accepted, e.g. to make dhcp client work
1570        *
1571        * The checks are:
1572        *  - the source is a recieve => it's from us => bogus, do this
1573        *    first since it sets a different error code.
1574        *  - uRPF check for any route to source - accept if passes.
1575        *  - allow packets destined to the broadcast address from unknown sources
1576        */
1577
1578       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1579                   && dpo0->dpoi_type == DPO_RECEIVE) ?
1580                  IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1581       *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1582                   && !fib_urpf_check_size (lb0->lb_urpf)
1583                   && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1584                  IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1585
1586       last_check->src.as_u32 = ip0->src_address.as_u32;
1587       last_check->lbi = lbi0;
1588       last_check->error = *error0;
1589       last_check->first = 0;
1590     }
1591   else
1592     {
1593       vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1594         vnet_buffer (b)->ip.adj_index[VLIB_TX];
1595       vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1596       *error0 = last_check->error;
1597     }
1598 }
1599
1600 static inline void
1601 ip4_local_check_src_x2 (vlib_buffer_t **b, ip4_header_t **ip,
1602                         ip4_local_last_check_t *last_check, u8 *error,
1603                         int is_receive_dpo)
1604 {
1605   const dpo_id_t *dpo[2];
1606   load_balance_t *lb[2];
1607   u32 not_last_hit;
1608   u32 lbi[2];
1609
1610   not_last_hit = last_check->first;
1611   not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1612   not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1613
1614   vnet_buffer (b[0])->ip.fib_index =
1615     vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1616     vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1617     vnet_buffer (b[0])->ip.fib_index;
1618
1619   vnet_buffer (b[1])->ip.fib_index =
1620     vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1621     vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1622     vnet_buffer (b[1])->ip.fib_index;
1623
1624   if (is_receive_dpo)
1625     {
1626       const receive_dpo_t *rd0, *rd1;
1627       rd0 = receive_dpo_get (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
1628       rd1 = receive_dpo_get (vnet_buffer (b[1])->ip.adj_index[VLIB_TX]);
1629       vnet_buffer (b[0])->ip.rx_sw_if_index = rd0->rd_sw_if_index;
1630       vnet_buffer (b[1])->ip.rx_sw_if_index = rd1->rd_sw_if_index;
1631     }
1632   else
1633     {
1634       vnet_buffer (b[0])->ip.rx_sw_if_index =
1635         vnet_buffer (b[0])->sw_if_index[VLIB_RX];
1636       vnet_buffer (b[1])->ip.rx_sw_if_index =
1637         vnet_buffer (b[1])->sw_if_index[VLIB_RX];
1638     }
1639
1640   /*
1641    * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1642    *  adjacency for the destination address (the local interface address).
1643    * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1644    *  adjacency for the source address (the remote sender's address)
1645    */
1646   if (PREDICT_TRUE (not_last_hit))
1647     {
1648       ip4_fib_forwarding_lookup_x2 (
1649         vnet_buffer (b[0])->ip.fib_index, vnet_buffer (b[1])->ip.fib_index,
1650         &ip[0]->src_address, &ip[1]->src_address, &lbi[0], &lbi[1]);
1651
1652       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1653         vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1654       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1655
1656       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1657         vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1658       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1659
1660       lb[0] = load_balance_get (lbi[0]);
1661       lb[1] = load_balance_get (lbi[1]);
1662
1663       dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1664       dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1665
1666       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1667                    dpo[0]->dpoi_type == DPO_RECEIVE) ?
1668                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1669       error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1670                    !fib_urpf_check_size (lb[0]->lb_urpf) &&
1671                    ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1672                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1673
1674       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1675                    dpo[1]->dpoi_type == DPO_RECEIVE) ?
1676                   IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1677       error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1678                    !fib_urpf_check_size (lb[1]->lb_urpf) &&
1679                    ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1680                   ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1681
1682       last_check->src.as_u32 = ip[1]->src_address.as_u32;
1683       last_check->lbi = lbi[1];
1684       last_check->error = error[1];
1685       last_check->first = 0;
1686     }
1687   else
1688     {
1689       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1690         vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1691       vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1692
1693       vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1694         vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1695       vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1696
1697       error[0] = last_check->error;
1698       error[1] = last_check->error;
1699     }
1700 }
1701
1702 enum ip_local_packet_type_e
1703 {
1704   IP_LOCAL_PACKET_TYPE_L4,
1705   IP_LOCAL_PACKET_TYPE_NAT,
1706   IP_LOCAL_PACKET_TYPE_FRAG,
1707 };
1708
1709 /**
1710  * Determine packet type and next node.
1711  *
1712  * The expectation is that all packets that are not L4 will skip
1713  * checksums and source checks.
1714  */
1715 always_inline u8
1716 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1717 {
1718   ip_lookup_main_t *lm = &ip4_main.lookup_main;
1719
1720   if (PREDICT_FALSE (ip4_is_fragment (ip)))
1721     {
1722       *next = IP_LOCAL_NEXT_REASSEMBLY;
1723       return IP_LOCAL_PACKET_TYPE_FRAG;
1724     }
1725   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1726     {
1727       *next = lm->local_next_by_ip_protocol[ip->protocol];
1728       return IP_LOCAL_PACKET_TYPE_NAT;
1729     }
1730
1731   *next = lm->local_next_by_ip_protocol[ip->protocol];
1732   return IP_LOCAL_PACKET_TYPE_L4;
1733 }
1734
1735 static inline uword
1736 ip4_local_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1737                   vlib_frame_t *frame, int head_of_feature_arc,
1738                   int is_receive_dpo)
1739 {
1740   u32 *from, n_left_from;
1741   vlib_node_runtime_t *error_node =
1742     vlib_node_get_runtime (vm, ip4_local_node.index);
1743   u16 nexts[VLIB_FRAME_SIZE], *next;
1744   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1745   ip4_header_t *ip[2];
1746   u8 error[2], pt[2];
1747
1748   ip4_local_last_check_t last_check = {
1749     /*
1750      * 0.0.0.0 can appear as the source address of an IP packet,
1751      * as can any other address, hence the need to use the 'first'
1752      * member to make sure the .lbi is initialised for the first
1753      * packet.
1754      */
1755     .src = {.as_u32 = 0},
1756     .lbi = ~0,
1757     .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1758     .first = 1,
1759   };
1760
1761   from = vlib_frame_vector_args (frame);
1762   n_left_from = frame->n_vectors;
1763
1764   if (node->flags & VLIB_NODE_FLAG_TRACE)
1765     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1766
1767   vlib_get_buffers (vm, from, bufs, n_left_from);
1768   b = bufs;
1769   next = nexts;
1770
1771   while (n_left_from >= 6)
1772     {
1773       u8 not_batch = 0;
1774
1775       /* Prefetch next iteration. */
1776       {
1777         vlib_prefetch_buffer_header (b[4], LOAD);
1778         vlib_prefetch_buffer_header (b[5], LOAD);
1779
1780         clib_prefetch_load (b[4]->data);
1781         clib_prefetch_load (b[5]->data);
1782       }
1783
1784       error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1785
1786       ip[0] = vlib_buffer_get_current (b[0]);
1787       ip[1] = vlib_buffer_get_current (b[1]);
1788
1789       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1790       vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1791
1792       pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1793       pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1794
1795       not_batch = pt[0] ^ pt[1];
1796
1797       if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1798         goto skip_checks;
1799
1800       if (PREDICT_TRUE (not_batch == 0))
1801         {
1802           ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1803           ip4_local_check_src_x2 (b, ip, &last_check, error, is_receive_dpo);
1804         }
1805       else
1806         {
1807           if (!pt[0])
1808             {
1809               ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1810               ip4_local_check_src (b[0], ip[0], &last_check, &error[0],
1811                                    is_receive_dpo);
1812             }
1813           if (!pt[1])
1814             {
1815               ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1816               ip4_local_check_src (b[1], ip[1], &last_check, &error[1],
1817                                    is_receive_dpo);
1818             }
1819         }
1820
1821     skip_checks:
1822
1823       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1824                                     head_of_feature_arc);
1825       ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1826                                     head_of_feature_arc);
1827
1828       b += 2;
1829       next += 2;
1830       n_left_from -= 2;
1831     }
1832
1833   while (n_left_from > 0)
1834     {
1835       error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1836
1837       ip[0] = vlib_buffer_get_current (b[0]);
1838       vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1839       pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1840
1841       if (head_of_feature_arc == 0 || pt[0])
1842         goto skip_check;
1843
1844       ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1845       ip4_local_check_src (b[0], ip[0], &last_check, &error[0],
1846                            is_receive_dpo);
1847
1848     skip_check:
1849
1850       ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1851                                     head_of_feature_arc);
1852
1853       b += 1;
1854       next += 1;
1855       n_left_from -= 1;
1856     }
1857
1858   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1859   return frame->n_vectors;
1860 }
1861
1862 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1863                                vlib_frame_t * frame)
1864 {
1865   return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */,
1866                            0 /* is_receive_dpo */);
1867 }
1868
1869 VLIB_REGISTER_NODE (ip4_local_node) =
1870 {
1871   .name = "ip4-local",
1872   .vector_size = sizeof (u32),
1873   .format_trace = format_ip4_forward_next_trace,
1874   .n_errors = IP4_N_ERROR,
1875   .error_strings = ip4_error_strings,
1876   .n_next_nodes = IP_LOCAL_N_NEXT,
1877   .next_nodes =
1878   {
1879     [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1880     [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1881     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1882     [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1883     [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-local-full-reassembly",
1884   },
1885 };
1886
1887 VLIB_NODE_FN (ip4_receive_local_node)
1888 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1889 {
1890   return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */,
1891                            1 /* is_receive_dpo */);
1892 }
1893
1894 VLIB_REGISTER_NODE (ip4_receive_local_node) = {
1895   .name = "ip4-receive",
1896   .vector_size = sizeof (u32),
1897   .format_trace = format_ip4_forward_next_trace,
1898   .sibling_of = "ip4-local"
1899 };
1900
1901 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1902                                           vlib_node_runtime_t * node,
1903                                           vlib_frame_t * frame)
1904 {
1905   return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */,
1906                            0 /* is_receive_dpo */);
1907 }
1908
1909 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1910   .name = "ip4-local-end-of-arc",
1911   .vector_size = sizeof (u32),
1912
1913   .format_trace = format_ip4_forward_next_trace,
1914   .sibling_of = "ip4-local",
1915 };
1916
1917 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1918   .arc_name = "ip4-local",
1919   .node_name = "ip4-local-end-of-arc",
1920   .runs_before = 0, /* not before any other features */
1921 };
1922
1923 #ifndef CLIB_MARCH_VARIANT
1924 void
1925 ip4_register_protocol (u32 protocol, u32 node_index)
1926 {
1927   vlib_main_t *vm = vlib_get_main ();
1928   ip4_main_t *im = &ip4_main;
1929   ip_lookup_main_t *lm = &im->lookup_main;
1930
1931   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1932   lm->local_next_by_ip_protocol[protocol] =
1933     vlib_node_add_next (vm, ip4_local_node.index, node_index);
1934 }
1935
1936 void
1937 ip4_unregister_protocol (u32 protocol)
1938 {
1939   ip4_main_t *im = &ip4_main;
1940   ip_lookup_main_t *lm = &im->lookup_main;
1941
1942   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1943   lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1944 }
1945 #endif
1946
1947 static clib_error_t *
1948 show_ip_local_command_fn (vlib_main_t * vm,
1949                           unformat_input_t * input, vlib_cli_command_t * cmd)
1950 {
1951   ip4_main_t *im = &ip4_main;
1952   ip_lookup_main_t *lm = &im->lookup_main;
1953   int i;
1954
1955   vlib_cli_output (vm, "Protocols handled by ip4_local");
1956   for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1957     {
1958       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1959         {
1960           u32 node_index = vlib_get_node (vm,
1961                                           ip4_local_node.index)->
1962             next_nodes[lm->local_next_by_ip_protocol[i]];
1963           vlib_cli_output (vm, "%U: %U", format_ip_protocol, i,
1964                            format_vlib_node_name, vm, node_index);
1965         }
1966     }
1967   return 0;
1968 }
1969
1970
1971
1972 /*?
1973  * Display the set of protocols handled by the local IPv4 stack.
1974  *
1975  * @cliexpar
1976  * Example of how to display local protocol table:
1977  * @cliexstart{show ip local}
1978  * Protocols handled by ip4_local
1979  * 1
1980  * 17
1981  * 47
1982  * @cliexend
1983 ?*/
1984 /* *INDENT-OFF* */
1985 VLIB_CLI_COMMAND (show_ip_local, static) =
1986 {
1987   .path = "show ip local",
1988   .function = show_ip_local_command_fn,
1989   .short_help = "show ip local",
1990 };
1991 /* *INDENT-ON* */
1992
1993 typedef enum
1994 {
1995   IP4_REWRITE_NEXT_DROP,
1996   IP4_REWRITE_NEXT_ICMP_ERROR,
1997   IP4_REWRITE_NEXT_FRAGMENT,
1998   IP4_REWRITE_N_NEXT            /* Last */
1999 } ip4_rewrite_next_t;
2000
2001 /**
2002  * This bits of an IPv4 address to mask to construct a multicast
2003  * MAC address
2004  */
2005 #if CLIB_ARCH_IS_BIG_ENDIAN
2006 #define IP4_MCAST_ADDR_MASK 0x007fffff
2007 #else
2008 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2009 #endif
2010
2011 always_inline void
2012 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2013                u16 adj_packet_bytes, bool df, u16 * next,
2014                u8 is_midchain, u32 * error)
2015 {
2016   if (packet_len > adj_packet_bytes)
2017     {
2018       *error = IP4_ERROR_MTU_EXCEEDED;
2019       if (df)
2020         {
2021           icmp4_error_set_vnet_buffer
2022             (b, ICMP4_destination_unreachable,
2023              ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2024              adj_packet_bytes);
2025           *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2026         }
2027       else
2028         {
2029           /* IP fragmentation */
2030           ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2031                                    (is_midchain ?
2032                                     IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
2033                                     IP_FRAG_NEXT_IP_REWRITE), 0);
2034           *next = IP4_REWRITE_NEXT_FRAGMENT;
2035         }
2036     }
2037 }
2038
2039 /* increment TTL & update checksum.
2040    Works either endian, so no need for byte swap. */
2041 static_always_inline void
2042 ip4_ttl_inc (vlib_buffer_t * b, ip4_header_t * ip)
2043 {
2044   i32 ttl;
2045   u32 checksum;
2046   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2047     return;
2048
2049   ttl = ip->ttl;
2050
2051   checksum = ip->checksum - clib_host_to_net_u16 (0x0100);
2052   checksum += checksum >= 0xffff;
2053
2054   ip->checksum = checksum;
2055   ttl += 1;
2056   ip->ttl = ttl;
2057
2058   ASSERT (ip4_header_checksum_is_valid (ip) ||
2059           (vnet_buffer (b)->oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM) ||
2060           (vnet_buffer (b)->oflags & VNET_BUFFER_OFFLOAD_F_OUTER_IP_CKSUM));
2061 }
2062
2063 /* Decrement TTL & update checksum.
2064    Works either endian, so no need for byte swap. */
2065 static_always_inline void
2066 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2067                             u32 * error)
2068 {
2069   i32 ttl;
2070   u32 checksum;
2071   if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2072     return;
2073
2074   ttl = ip->ttl;
2075
2076   /* Input node should have reject packets with ttl 0. */
2077   ASSERT (ip->ttl > 0);
2078
2079   checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2080   checksum += checksum >= 0xffff;
2081
2082   ip->checksum = checksum;
2083   ttl -= 1;
2084   ip->ttl = ttl;
2085
2086   /*
2087    * If the ttl drops below 1 when forwarding, generate
2088    * an ICMP response.
2089    */
2090   if (PREDICT_FALSE (ttl <= 0))
2091     {
2092       *error = IP4_ERROR_TIME_EXPIRED;
2093       vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2094       icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2095                                    ICMP4_time_exceeded_ttl_exceeded_in_transit,
2096                                    0);
2097       *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2098     }
2099
2100   /* Verify checksum. */
2101   ASSERT (ip4_header_checksum_is_valid (ip) ||
2102           (vnet_buffer (b)->oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM) ||
2103           (vnet_buffer (b)->oflags & VNET_BUFFER_OFFLOAD_F_OUTER_IP_CKSUM));
2104 }
2105
2106 always_inline uword
2107 ip4_rewrite_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2108                     vlib_frame_t *frame, int do_counters, int is_midchain,
2109                     int is_mcast)
2110 {
2111   ip_lookup_main_t *lm = &ip4_main.lookup_main;
2112   u32 *from = vlib_frame_vector_args (frame);
2113   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2114   u16 nexts[VLIB_FRAME_SIZE], *next;
2115   u32 n_left_from;
2116   vlib_node_runtime_t *error_node =
2117     vlib_node_get_runtime (vm, ip4_input_node.index);
2118
2119   n_left_from = frame->n_vectors;
2120   u32 thread_index = vm->thread_index;
2121
2122   vlib_get_buffers (vm, from, bufs, n_left_from);
2123   clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2124
2125 #if (CLIB_N_PREFETCHES >= 8)
2126   if (n_left_from >= 6)
2127     {
2128       int i;
2129       for (i = 2; i < 6; i++)
2130         vlib_prefetch_buffer_header (bufs[i], LOAD);
2131     }
2132
2133   next = nexts;
2134   b = bufs;
2135   while (n_left_from >= 8)
2136     {
2137       const ip_adjacency_t *adj0, *adj1;
2138       ip4_header_t *ip0, *ip1;
2139       u32 rw_len0, error0, adj_index0;
2140       u32 rw_len1, error1, adj_index1;
2141       u32 tx_sw_if_index0, tx_sw_if_index1;
2142       u8 *p;
2143
2144       if (is_midchain)
2145         {
2146           vlib_prefetch_buffer_header (b[6], LOAD);
2147           vlib_prefetch_buffer_header (b[7], LOAD);
2148         }
2149
2150       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2151       adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2152
2153       /*
2154        * pre-fetch the per-adjacency counters
2155        */
2156       if (do_counters)
2157         {
2158           vlib_prefetch_combined_counter (&adjacency_counters,
2159                                           thread_index, adj_index0);
2160           vlib_prefetch_combined_counter (&adjacency_counters,
2161                                           thread_index, adj_index1);
2162         }
2163
2164       ip0 = vlib_buffer_get_current (b[0]);
2165       ip1 = vlib_buffer_get_current (b[1]);
2166
2167       error0 = error1 = IP4_ERROR_NONE;
2168
2169       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2170       ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2171
2172       /* Rewrite packet header and updates lengths. */
2173       adj0 = adj_get (adj_index0);
2174       adj1 = adj_get (adj_index1);
2175
2176       /* Worth pipelining. No guarantee that adj0,1 are hot... */
2177       rw_len0 = adj0[0].rewrite_header.data_bytes;
2178       rw_len1 = adj1[0].rewrite_header.data_bytes;
2179       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2180       vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2181
2182       p = vlib_buffer_get_current (b[2]);
2183       clib_prefetch_store (p - CLIB_CACHE_LINE_BYTES);
2184       clib_prefetch_load (p);
2185
2186       p = vlib_buffer_get_current (b[3]);
2187       clib_prefetch_store (p - CLIB_CACHE_LINE_BYTES);
2188       clib_prefetch_load (p);
2189
2190       /* Check MTU of outgoing interface. */
2191       u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2192       u16 ip1_len = clib_net_to_host_u16 (ip1->length);
2193
2194       if (b[0]->flags & VNET_BUFFER_F_GSO)
2195         ip0_len = gso_mtu_sz (b[0]);
2196       if (b[1]->flags & VNET_BUFFER_F_GSO)
2197         ip1_len = gso_mtu_sz (b[1]);
2198
2199       ip4_mtu_check (b[0], ip0_len,
2200                      adj0[0].rewrite_header.max_l3_packet_bytes,
2201                      ip0->flags_and_fragment_offset &
2202                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2203                      next + 0, is_midchain, &error0);
2204       ip4_mtu_check (b[1], ip1_len,
2205                      adj1[0].rewrite_header.max_l3_packet_bytes,
2206                      ip1->flags_and_fragment_offset &
2207                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2208                      next + 1, is_midchain, &error1);
2209
2210       if (is_mcast)
2211         {
2212           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2213                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2214                     IP4_ERROR_SAME_INTERFACE : error0);
2215           error1 = ((adj1[0].rewrite_header.sw_if_index ==
2216                      vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2217                     IP4_ERROR_SAME_INTERFACE : error1);
2218         }
2219
2220       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2221        * to see the IP header */
2222       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2223         {
2224           u32 next_index = adj0[0].rewrite_header.next_index;
2225           vlib_buffer_advance (b[0], -(word) rw_len0);
2226
2227           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2228           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2229
2230           if (PREDICT_FALSE
2231               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2232             vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2233                                                 tx_sw_if_index0,
2234                                                 &next_index, b[0],
2235                                                 adj0->ia_cfg_index);
2236
2237           next[0] = next_index;
2238           if (is_midchain)
2239             vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2240                                         0 /* is_ip6 */ );
2241         }
2242       else
2243         {
2244           b[0]->error = error_node->errors[error0];
2245           if (error0 == IP4_ERROR_MTU_EXCEEDED)
2246             ip4_ttl_inc (b[0], ip0);
2247         }
2248       if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2249         {
2250           u32 next_index = adj1[0].rewrite_header.next_index;
2251           vlib_buffer_advance (b[1], -(word) rw_len1);
2252
2253           tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2254           vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2255
2256           if (PREDICT_FALSE
2257               (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2258             vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2259                                                 tx_sw_if_index1,
2260                                                 &next_index, b[1],
2261                                                 adj1->ia_cfg_index);
2262           next[1] = next_index;
2263           if (is_midchain)
2264             vnet_calc_checksums_inline (vm, b[1], 1 /* is_ip4 */ ,
2265                                         0 /* is_ip6 */ );
2266         }
2267       else
2268         {
2269           b[1]->error = error_node->errors[error1];
2270           if (error1 == IP4_ERROR_MTU_EXCEEDED)
2271             ip4_ttl_inc (b[1], ip1);
2272         }
2273
2274       if (is_midchain)
2275         /* Guess we are only writing on ipv4 header. */
2276         vnet_rewrite_two_headers (adj0[0], adj1[0],
2277                                   ip0, ip1, sizeof (ip4_header_t));
2278       else
2279         /* Guess we are only writing on simple Ethernet header. */
2280         vnet_rewrite_two_headers (adj0[0], adj1[0],
2281                                   ip0, ip1, sizeof (ethernet_header_t));
2282
2283       if (do_counters)
2284         {
2285           if (error0 == IP4_ERROR_NONE)
2286             vlib_increment_combined_counter
2287               (&adjacency_counters,
2288                thread_index,
2289                adj_index0, 1,
2290                vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2291
2292           if (error1 == IP4_ERROR_NONE)
2293             vlib_increment_combined_counter
2294               (&adjacency_counters,
2295                thread_index,
2296                adj_index1, 1,
2297                vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2298         }
2299
2300       if (is_midchain)
2301         {
2302           if (error0 == IP4_ERROR_NONE)
2303             adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2304           if (error1 == IP4_ERROR_NONE)
2305             adj_midchain_fixup (vm, adj1, b[1], VNET_LINK_IP4);
2306         }
2307
2308       if (is_mcast)
2309         {
2310           /* copy bytes from the IP address into the MAC rewrite */
2311           if (error0 == IP4_ERROR_NONE)
2312             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2313                                         adj0->rewrite_header.dst_mcast_offset,
2314                                         &ip0->dst_address.as_u32, (u8 *) ip0);
2315           if (error1 == IP4_ERROR_NONE)
2316             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2317                                         adj1->rewrite_header.dst_mcast_offset,
2318                                         &ip1->dst_address.as_u32, (u8 *) ip1);
2319         }
2320
2321       next += 2;
2322       b += 2;
2323       n_left_from -= 2;
2324     }
2325 #elif (CLIB_N_PREFETCHES >= 4)
2326   next = nexts;
2327   b = bufs;
2328   while (n_left_from >= 1)
2329     {
2330       ip_adjacency_t *adj0;
2331       ip4_header_t *ip0;
2332       u32 rw_len0, error0, adj_index0;
2333       u32 tx_sw_if_index0;
2334       u8 *p;
2335
2336       /* Prefetch next iteration */
2337       if (PREDICT_TRUE (n_left_from >= 4))
2338         {
2339           ip_adjacency_t *adj2;
2340           u32 adj_index2;
2341
2342           vlib_prefetch_buffer_header (b[3], LOAD);
2343           vlib_prefetch_buffer_data (b[2], LOAD);
2344
2345           /* Prefetch adj->rewrite_header */
2346           adj_index2 = vnet_buffer (b[2])->ip.adj_index[VLIB_TX];
2347           adj2 = adj_get (adj_index2);
2348           p = (u8 *) adj2;
2349           CLIB_PREFETCH (p + CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES,
2350                          LOAD);
2351         }
2352
2353       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2354
2355       /*
2356        * Prefetch the per-adjacency counters
2357        */
2358       if (do_counters)
2359         {
2360           vlib_prefetch_combined_counter (&adjacency_counters,
2361                                           thread_index, adj_index0);
2362         }
2363
2364       ip0 = vlib_buffer_get_current (b[0]);
2365
2366       error0 = IP4_ERROR_NONE;
2367
2368       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2369
2370       /* Rewrite packet header and updates lengths. */
2371       adj0 = adj_get (adj_index0);
2372
2373       /* Rewrite header was prefetched. */
2374       rw_len0 = adj0[0].rewrite_header.data_bytes;
2375       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2376
2377       /* Check MTU of outgoing interface. */
2378       u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2379
2380       if (b[0]->flags & VNET_BUFFER_F_GSO)
2381         ip0_len = gso_mtu_sz (b[0]);
2382
2383       ip4_mtu_check (b[0], ip0_len,
2384                      adj0[0].rewrite_header.max_l3_packet_bytes,
2385                      ip0->flags_and_fragment_offset &
2386                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2387                      next + 0, is_midchain, &error0);
2388
2389       if (is_mcast)
2390         {
2391           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2392                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2393                     IP4_ERROR_SAME_INTERFACE : error0);
2394         }
2395
2396       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2397        * to see the IP header */
2398       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2399         {
2400           u32 next_index = adj0[0].rewrite_header.next_index;
2401           vlib_buffer_advance (b[0], -(word) rw_len0);
2402           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2403           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2404
2405           if (PREDICT_FALSE
2406               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2407             vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2408                                                 tx_sw_if_index0,
2409                                                 &next_index, b[0],
2410                                                 adj0->ia_cfg_index);
2411           next[0] = next_index;
2412
2413           if (is_midchain)
2414             {
2415               vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2416                                           0 /* is_ip6 */ );
2417
2418               /* Guess we are only writing on ipv4 header. */
2419               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2420             }
2421           else
2422             /* Guess we are only writing on simple Ethernet header. */
2423             vnet_rewrite_one_header (adj0[0], ip0,
2424                                      sizeof (ethernet_header_t));
2425
2426           /*
2427            * Bump the per-adjacency counters
2428            */
2429           if (do_counters)
2430             vlib_increment_combined_counter
2431               (&adjacency_counters,
2432                thread_index,
2433                adj_index0, 1, vlib_buffer_length_in_chain (vm,
2434                                                            b[0]) + rw_len0);
2435
2436           if (is_midchain)
2437             adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2438
2439           if (is_mcast)
2440             /* copy bytes from the IP address into the MAC rewrite */
2441             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2442                                         adj0->rewrite_header.dst_mcast_offset,
2443                                         &ip0->dst_address.as_u32, (u8 *) ip0);
2444         }
2445       else
2446         {
2447           b[0]->error = error_node->errors[error0];
2448           if (error0 == IP4_ERROR_MTU_EXCEEDED)
2449             ip4_ttl_inc (b[0], ip0);
2450         }
2451
2452       next += 1;
2453       b += 1;
2454       n_left_from -= 1;
2455     }
2456 #endif
2457
2458   while (n_left_from > 0)
2459     {
2460       ip_adjacency_t *adj0;
2461       ip4_header_t *ip0;
2462       u32 rw_len0, adj_index0, error0;
2463       u32 tx_sw_if_index0;
2464
2465       adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2466
2467       adj0 = adj_get (adj_index0);
2468
2469       if (do_counters)
2470         vlib_prefetch_combined_counter (&adjacency_counters,
2471                                         thread_index, adj_index0);
2472
2473       ip0 = vlib_buffer_get_current (b[0]);
2474
2475       error0 = IP4_ERROR_NONE;
2476
2477       ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2478
2479
2480       /* Update packet buffer attributes/set output interface. */
2481       rw_len0 = adj0[0].rewrite_header.data_bytes;
2482       vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2483
2484       /* Check MTU of outgoing interface. */
2485       u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2486       if (b[0]->flags & VNET_BUFFER_F_GSO)
2487         ip0_len = gso_mtu_sz (b[0]);
2488
2489       ip4_mtu_check (b[0], ip0_len,
2490                      adj0[0].rewrite_header.max_l3_packet_bytes,
2491                      ip0->flags_and_fragment_offset &
2492                      clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2493                      next + 0, is_midchain, &error0);
2494
2495       if (is_mcast)
2496         {
2497           error0 = ((adj0[0].rewrite_header.sw_if_index ==
2498                      vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2499                     IP4_ERROR_SAME_INTERFACE : error0);
2500         }
2501
2502       /* Don't adjust the buffer for ttl issue; icmp-error node wants
2503        * to see the IP header */
2504       if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2505         {
2506           u32 next_index = adj0[0].rewrite_header.next_index;
2507           vlib_buffer_advance (b[0], -(word) rw_len0);
2508           tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2509           vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2510
2511           if (PREDICT_FALSE
2512               (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2513             vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2514                                                 tx_sw_if_index0,
2515                                                 &next_index, b[0],
2516                                                 adj0->ia_cfg_index);
2517           next[0] = next_index;
2518
2519           if (is_midchain)
2520             {
2521               /* this acts on the packet that is about to be encapped */
2522               vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2523                                           0 /* is_ip6 */ );
2524
2525               /* Guess we are only writing on ipv4 header. */
2526               vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2527             }
2528           else
2529             /* Guess we are only writing on simple Ethernet header. */
2530             vnet_rewrite_one_header (adj0[0], ip0,
2531                                      sizeof (ethernet_header_t));
2532
2533           if (do_counters)
2534             vlib_increment_combined_counter
2535               (&adjacency_counters,
2536                thread_index, adj_index0, 1,
2537                vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2538
2539           if (is_midchain)
2540             adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2541
2542           if (is_mcast)
2543             /* copy bytes from the IP address into the MAC rewrite */
2544             vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2545                                         adj0->rewrite_header.dst_mcast_offset,
2546                                         &ip0->dst_address.as_u32, (u8 *) ip0);
2547         }
2548       else
2549         {
2550           b[0]->error = error_node->errors[error0];
2551           /* undo the TTL decrement - we'll be back to do it again */
2552           if (error0 == IP4_ERROR_MTU_EXCEEDED)
2553             ip4_ttl_inc (b[0], ip0);
2554         }
2555
2556       next += 1;
2557       b += 1;
2558       n_left_from -= 1;
2559     }
2560
2561
2562   /* Need to do trace after rewrites to pick up new packet data. */
2563   if (node->flags & VLIB_NODE_FLAG_TRACE)
2564     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2565
2566   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2567   return frame->n_vectors;
2568 }
2569
2570 /** @brief IPv4 rewrite node.
2571     @node ip4-rewrite
2572
2573     This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2574     header checksum, fetch the ip adjacency, check the outbound mtu,
2575     apply the adjacency rewrite, and send pkts to the adjacency
2576     rewrite header's rewrite_next_index.
2577
2578     @param vm vlib_main_t corresponding to the current thread
2579     @param node vlib_node_runtime_t
2580     @param frame vlib_frame_t whose contents should be dispatched
2581
2582     @par Graph mechanics: buffer metadata, next index usage
2583
2584     @em Uses:
2585     - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2586         - the rewrite adjacency index
2587     - <code>adj->lookup_next_index</code>
2588         - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2589           the packet will be dropped.
2590     - <code>adj->rewrite_header</code>
2591         - Rewrite string length, rewrite string, next_index
2592
2593     @em Sets:
2594     - <code>b->current_data, b->current_length</code>
2595         - Updated net of applying the rewrite string
2596
2597     <em>Next Indices:</em>
2598     - <code> adj->rewrite_header.next_index </code>
2599       or @c ip4-drop
2600 */
2601
2602 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2603                                  vlib_frame_t * frame)
2604 {
2605   if (adj_are_counters_enabled ())
2606     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2607   else
2608     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2609 }
2610
2611 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2612                                        vlib_node_runtime_t * node,
2613                                        vlib_frame_t * frame)
2614 {
2615   if (adj_are_counters_enabled ())
2616     return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2617   else
2618     return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2619 }
2620
2621 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2622                                   vlib_node_runtime_t * node,
2623                                   vlib_frame_t * frame)
2624 {
2625   if (adj_are_counters_enabled ())
2626     return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2627   else
2628     return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2629 }
2630
2631 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2632                                        vlib_node_runtime_t * node,
2633                                        vlib_frame_t * frame)
2634 {
2635   if (adj_are_counters_enabled ())
2636     return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2637   else
2638     return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2639 }
2640
2641 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2642                                         vlib_node_runtime_t * node,
2643                                         vlib_frame_t * frame)
2644 {
2645   if (adj_are_counters_enabled ())
2646     return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2647   else
2648     return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2649 }
2650
2651 /* *INDENT-OFF* */
2652 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2653   .name = "ip4-rewrite",
2654   .vector_size = sizeof (u32),
2655
2656   .format_trace = format_ip4_rewrite_trace,
2657
2658   .n_next_nodes = IP4_REWRITE_N_NEXT,
2659   .next_nodes = {
2660     [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2661     [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2662     [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2663   },
2664 };
2665
2666 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2667   .name = "ip4-rewrite-bcast",
2668   .vector_size = sizeof (u32),
2669
2670   .format_trace = format_ip4_rewrite_trace,
2671   .sibling_of = "ip4-rewrite",
2672 };
2673
2674 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2675   .name = "ip4-rewrite-mcast",
2676   .vector_size = sizeof (u32),
2677
2678   .format_trace = format_ip4_rewrite_trace,
2679   .sibling_of = "ip4-rewrite",
2680 };
2681
2682 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2683   .name = "ip4-mcast-midchain",
2684   .vector_size = sizeof (u32),
2685
2686   .format_trace = format_ip4_rewrite_trace,
2687   .sibling_of = "ip4-rewrite",
2688 };
2689
2690 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2691   .name = "ip4-midchain",
2692   .vector_size = sizeof (u32),
2693   .format_trace = format_ip4_rewrite_trace,
2694   .sibling_of = "ip4-rewrite",
2695 };
2696 /* *INDENT-ON */
2697
2698 static clib_error_t *
2699 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2700                              unformat_input_t * input,
2701                              vlib_cli_command_t * cmd)
2702 {
2703   int matched = 0;
2704   u32 table_id = 0;
2705   u32 flow_hash_config = 0;
2706   int rv;
2707
2708   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2709     {
2710       if (unformat (input, "table %d", &table_id))
2711         matched = 1;
2712 #define _(a, b, v)                                                            \
2713   else if (unformat (input, #a))                                              \
2714   {                                                                           \
2715     flow_hash_config |= v;                                                    \
2716     matched = 1;                                                              \
2717   }
2718       foreach_flow_hash_bit
2719 #undef _
2720         else
2721         break;
2722     }
2723
2724   if (matched == 0)
2725     return clib_error_return (0, "unknown input `%U'",
2726                               format_unformat_error, input);
2727
2728   rv = ip_flow_hash_set (AF_IP4, table_id, flow_hash_config);
2729   switch (rv)
2730     {
2731     case 0:
2732       break;
2733
2734     case VNET_API_ERROR_NO_SUCH_FIB:
2735       return clib_error_return (0, "no such FIB table %d", table_id);
2736
2737     default:
2738       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2739       break;
2740     }
2741
2742   return 0;
2743 }
2744
2745 /*?
2746  * Configure the set of IPv4 fields used by the flow hash.
2747  *
2748  * @cliexpar
2749  * Example of how to set the flow hash on a given table:
2750  * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2751  * Example of display the configured flow hash:
2752  * @cliexstart{show ip fib}
2753  * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2754  * 0.0.0.0/0
2755  *   unicast-ip4-chain
2756  *   [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2757  *     [0] [@0]: dpo-drop ip6
2758  * 0.0.0.0/32
2759  *   unicast-ip4-chain
2760  *   [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2761  *     [0] [@0]: dpo-drop ip6
2762  * 224.0.0.0/8
2763  *   unicast-ip4-chain
2764  *   [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2765  *     [0] [@0]: dpo-drop ip6
2766  * 6.0.1.2/32
2767  *   unicast-ip4-chain
2768  *   [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2769  *     [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2770  * 7.0.0.1/32
2771  *   unicast-ip4-chain
2772  *   [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2773  *     [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2774  *     [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2775  *     [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2776  *     [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2777  * 240.0.0.0/8
2778  *   unicast-ip4-chain
2779  *   [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2780  *     [0] [@0]: dpo-drop ip6
2781  * 255.255.255.255/32
2782  *   unicast-ip4-chain
2783  *   [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2784  *     [0] [@0]: dpo-drop ip6
2785  * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2786  * 0.0.0.0/0
2787  *   unicast-ip4-chain
2788  *   [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2789  *     [0] [@0]: dpo-drop ip6
2790  * 0.0.0.0/32
2791  *   unicast-ip4-chain
2792  *   [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2793  *     [0] [@0]: dpo-drop ip6
2794  * 172.16.1.0/24
2795  *   unicast-ip4-chain
2796  *   [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2797  *     [0] [@4]: ipv4-glean: af_packet0
2798  * 172.16.1.1/32
2799  *   unicast-ip4-chain
2800  *   [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2801  *     [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2802  * 172.16.1.2/32
2803  *   unicast-ip4-chain
2804  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2805  *     [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2806  * 172.16.2.0/24
2807  *   unicast-ip4-chain
2808  *   [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2809  *     [0] [@4]: ipv4-glean: af_packet1
2810  * 172.16.2.1/32
2811  *   unicast-ip4-chain
2812  *   [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2813  *     [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2814  * 224.0.0.0/8
2815  *   unicast-ip4-chain
2816  *   [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2817  *     [0] [@0]: dpo-drop ip6
2818  * 240.0.0.0/8
2819  *   unicast-ip4-chain
2820  *   [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2821  *     [0] [@0]: dpo-drop ip6
2822  * 255.255.255.255/32
2823  *   unicast-ip4-chain
2824  *   [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2825  *     [0] [@0]: dpo-drop ip6
2826  * @cliexend
2827 ?*/
2828 /* *INDENT-OFF* */
2829 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2830 {
2831   .path = "set ip flow-hash",
2832   .short_help =
2833   "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2834   .function = set_ip_flow_hash_command_fn,
2835 };
2836 /* *INDENT-ON* */
2837
2838 #ifndef CLIB_MARCH_VARIANT
2839 int
2840 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2841                              u32 table_index)
2842 {
2843   vnet_main_t *vnm = vnet_get_main ();
2844   vnet_interface_main_t *im = &vnm->interface_main;
2845   ip4_main_t *ipm = &ip4_main;
2846   ip_lookup_main_t *lm = &ipm->lookup_main;
2847   vnet_classify_main_t *cm = &vnet_classify_main;
2848   ip4_address_t *if_addr;
2849
2850   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2851     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2852
2853   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2854     return VNET_API_ERROR_NO_SUCH_ENTRY;
2855
2856   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2857   lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2858
2859   if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2860
2861   if (NULL != if_addr)
2862     {
2863       fib_prefix_t pfx = {
2864         .fp_len = 32,
2865         .fp_proto = FIB_PROTOCOL_IP4,
2866         .fp_addr.ip4 = *if_addr,
2867       };
2868       u32 fib_index;
2869
2870       fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2871                                                        sw_if_index);
2872
2873
2874       if (table_index != (u32) ~ 0)
2875         {
2876           dpo_id_t dpo = DPO_INVALID;
2877
2878           dpo_set (&dpo,
2879                    DPO_CLASSIFY,
2880                    DPO_PROTO_IP4,
2881                    classify_dpo_create (DPO_PROTO_IP4, table_index));
2882
2883           fib_table_entry_special_dpo_add (fib_index,
2884                                            &pfx,
2885                                            FIB_SOURCE_CLASSIFY,
2886                                            FIB_ENTRY_FLAG_NONE, &dpo);
2887           dpo_reset (&dpo);
2888         }
2889       else
2890         {
2891           fib_table_entry_special_remove (fib_index,
2892                                           &pfx, FIB_SOURCE_CLASSIFY);
2893         }
2894     }
2895
2896   return 0;
2897 }
2898 #endif
2899
2900 static clib_error_t *
2901 set_ip_classify_command_fn (vlib_main_t * vm,
2902                             unformat_input_t * input,
2903                             vlib_cli_command_t * cmd)
2904 {
2905   u32 table_index = ~0;
2906   int table_index_set = 0;
2907   u32 sw_if_index = ~0;
2908   int rv;
2909
2910   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2911     {
2912       if (unformat (input, "table-index %d", &table_index))
2913         table_index_set = 1;
2914       else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2915                          vnet_get_main (), &sw_if_index))
2916         ;
2917       else
2918         break;
2919     }
2920
2921   if (table_index_set == 0)
2922     return clib_error_return (0, "classify table-index must be specified");
2923
2924   if (sw_if_index == ~0)
2925     return clib_error_return (0, "interface / subif must be specified");
2926
2927   rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2928
2929   switch (rv)
2930     {
2931     case 0:
2932       break;
2933
2934     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2935       return clib_error_return (0, "No such interface");
2936
2937     case VNET_API_ERROR_NO_SUCH_ENTRY:
2938       return clib_error_return (0, "No such classifier table");
2939     }
2940   return 0;
2941 }
2942
2943 /*?
2944  * Assign a classification table to an interface. The classification
2945  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2946  * commands. Once the table is create, use this command to filter packets
2947  * on an interface.
2948  *
2949  * @cliexpar
2950  * Example of how to assign a classification table to an interface:
2951  * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2952 ?*/
2953 /* *INDENT-OFF* */
2954 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2955 {
2956     .path = "set ip classify",
2957     .short_help =
2958     "set ip classify intfc <interface> table-index <classify-idx>",
2959     .function = set_ip_classify_command_fn,
2960 };
2961 /* *INDENT-ON* */
2962
2963 /*
2964  * fd.io coding-style-patch-verification: ON
2965  *
2966  * Local Variables:
2967  * eval: (c-set-style "gnu")
2968  * End:
2969  */