src/vnet/geneve/decap.c

   1 /*
   2  * Copyright (c) 2017 SUSE LLC.
   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 #include <vlib/vlib.h>
  17 #include <vnet/pg/pg.h>
  18 #include <vnet/geneve/geneve.h>
  19
  20 vlib_node_registration_t geneve4_input_node;
  21 vlib_node_registration_t geneve6_input_node;
  22
  23 typedef struct
  24 {
  25   u32 next_index;
  26   u32 tunnel_index;
  27   u32 error;
  28   u32 vni;
  29 } geneve_rx_trace_t;
  30
  31 static u8 *
  32 format_geneve_rx_trace (u8 * s, va_list * args)
  33 {
  34   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  35   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  36   geneve_rx_trace_t *t = va_arg (*args, geneve_rx_trace_t *);
  37
  38   if (t->tunnel_index != ~0)
  39     {
  40       s =
  41         format (s,
  42                 "GENEVE decap from geneve_tunnel%d vni %d next %d error %d",
  43                 t->tunnel_index, t->vni, t->next_index, t->error);
  44     }
  45   else
  46     {
  47       s = format (s, "GENEVE decap error - tunnel for vni %d does not exist",
  48                   t->vni);
  49     }
  50   return s;
  51 }
  52
  53 always_inline u32
  54 validate_geneve_fib (vlib_buffer_t * b, geneve_tunnel_t * t, u32 is_ip4)
  55 {
  56   u32 fib_index, sw_if_index;
  57
  58   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
  59
  60   if (is_ip4)
  61     fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
  62       vec_elt (ip4_main.fib_index_by_sw_if_index, sw_if_index) :
  63       vnet_buffer (b)->sw_if_index[VLIB_TX];
  64   else
  65     fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
  66       vec_elt (ip6_main.fib_index_by_sw_if_index, sw_if_index) :
  67       vnet_buffer (b)->sw_if_index[VLIB_TX];
  68
  69   return (fib_index == t->encap_fib_index);
  70 }
  71
  72 always_inline uword
  73 geneve_input (vlib_main_t * vm,
  74               vlib_node_runtime_t * node,
  75               vlib_frame_t * from_frame, u32 is_ip4)
  76 {
  77   u32 n_left_from, next_index, *from, *to_next;
  78   geneve_main_t *vxm = &geneve_main;
  79   vnet_main_t *vnm = vxm->vnet_main;
  80   vnet_interface_main_t *im = &vnm->interface_main;
  81   u32 last_tunnel_index = ~0;
  82   geneve4_tunnel_key_t last_key4;
  83   geneve6_tunnel_key_t last_key6;
  84   u32 pkts_decapsulated = 0;
  85   u32 thread_index = vlib_get_thread_index ();
  86   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
  87
  88   if (is_ip4)
  89     last_key4.as_u64 = ~0;
  90   else
  91     memset (&last_key6, 0xff, sizeof (last_key6));
  92
  93   from = vlib_frame_vector_args (from_frame);
  94   n_left_from = from_frame->n_vectors;
  95
  96   next_index = node->cached_next_index;
  97   stats_sw_if_index = node->runtime_data[0];
  98   stats_n_packets = stats_n_bytes = 0;
  99
 100   while (n_left_from > 0)
 101     {
 102       u32 n_left_to_next;
 103
 104       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 105       while (n_left_from >= 4 && n_left_to_next >= 2)
 106         {
 107           u32 bi0, bi1;
 108           vlib_buffer_t *b0, *b1;
 109           u32 next0, next1;
 110           ip4_header_t *ip4_0, *ip4_1;
 111           ip6_header_t *ip6_0, *ip6_1;
 112           geneve_header_t *geneve0, *geneve1;
 113           uword *p0, *p1;
 114           u32 tunnel_index0, tunnel_index1;
 115           geneve_tunnel_t *t0, *t1, *mt0 = NULL, *mt1 = NULL;
 116           geneve4_tunnel_key_t key4_0, key4_1;
 117           geneve6_tunnel_key_t key6_0, key6_1;
 118           u32 error0, error1;
 119           u32 sw_if_index0, sw_if_index1, len0, len1;
 120
 121           /* Prefetch next iteration. */
 122           {
 123             vlib_buffer_t *p2, *p3;
 124
 125             p2 = vlib_get_buffer (vm, from[2]);
 126             p3 = vlib_get_buffer (vm, from[3]);
 127
 128             vlib_prefetch_buffer_header (p2, LOAD);
 129             vlib_prefetch_buffer_header (p3, LOAD);
 130
 131             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 132             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 133           }
 134
 135           bi0 = from[0];
 136           bi1 = from[1];
 137           to_next[0] = bi0;
 138           to_next[1] = bi1;
 139           from += 2;
 140           to_next += 2;
 141           n_left_to_next -= 2;
 142           n_left_from -= 2;
 143
 144           b0 = vlib_get_buffer (vm, bi0);
 145           b1 = vlib_get_buffer (vm, bi1);
 146
 147           /* udp leaves current_data pointing at the geneve header */
 148           geneve0 = vlib_buffer_get_current (b0);
 149           geneve1 = vlib_buffer_get_current (b1);
 150           if (is_ip4)
 151             {
 152               vlib_buffer_advance
 153                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 154               vlib_buffer_advance
 155                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 156               ip4_0 = vlib_buffer_get_current (b0);
 157               ip4_1 = vlib_buffer_get_current (b1);
 158             }
 159           else
 160             {
 161               vlib_buffer_advance
 162                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 163               vlib_buffer_advance
 164                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 165               ip6_0 = vlib_buffer_get_current (b0);
 166               ip6_1 = vlib_buffer_get_current (b1);
 167             }
 168
 169           /* pop (ip, udp, geneve) */
 170           if (is_ip4)
 171             {
 172               vlib_buffer_advance
 173                 (b0,
 174                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 175                  GENEVE_BASE_HEADER_LENGTH +
 176                  vnet_get_geneve_options_len (geneve0));
 177               vlib_buffer_advance (b1,
 178                                    sizeof (*ip4_1) + sizeof (udp_header_t) +
 179                                    GENEVE_BASE_HEADER_LENGTH +
 180                                    vnet_get_geneve_options_len (geneve1));
 181             }
 182           else
 183             {
 184               vlib_buffer_advance
 185                 (b0,
 186                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 187                  GENEVE_BASE_HEADER_LENGTH +
 188                  vnet_get_geneve_options_len (geneve0));
 189               vlib_buffer_advance (b0,
 190                                    sizeof (*ip6_0) + sizeof (udp_header_t) +
 191                                    GENEVE_BASE_HEADER_LENGTH +
 192                                    vnet_get_geneve_options_len (geneve1));
 193             }
 194
 195           tunnel_index0 = ~0;
 196           error0 = 0;
 197
 198           tunnel_index1 = ~0;
 199           error1 = 0;
 200
 201           if (PREDICT_FALSE (geneve0->ver != GENEVE_VERSION))
 202             {
 203               error0 = GENEVE_ERROR_BAD_FLAGS;
 204               next0 = GENEVE_INPUT_NEXT_DROP;
 205               goto trace0;
 206             }
 207 #if SUPPORT_OPTIONS_HEADER==0
 208           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 209             {
 210               error0 = GENEVE_ERROR_BAD_FLAGS;
 211               next0 = GENEVE_INPUT_NEXT_DROP;
 212               goto trace0;
 213             }
 214 #endif
 215           if (is_ip4)
 216             {
 217               key4_0.remote = ip4_0->src_address.as_u32;
 218               key4_0.vni = geneve0->vni;
 219
 220               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 221               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 222                 {
 223                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 224                   if (PREDICT_FALSE (p0 == NULL))
 225                     {
 226                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 227                       next0 = GENEVE_INPUT_NEXT_DROP;
 228                       goto trace0;
 229                     }
 230                   last_key4.as_u64 = key4_0.as_u64;
 231                   tunnel_index0 = last_tunnel_index = p0[0];
 232                 }
 233               else
 234                 tunnel_index0 = last_tunnel_index;
 235               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 236
 237               /* Validate GENEVE tunnel encap-fib index agaist packet */
 238               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 239                 {
 240                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 241                   next0 = GENEVE_INPUT_NEXT_DROP;
 242                   goto trace0;
 243                 }
 244
 245               /* Validate GENEVE tunnel SIP against packet DIP */
 246               if (PREDICT_TRUE
 247                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 248                 goto next0;     /* valid packet */
 249               if (PREDICT_FALSE
 250                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 251                 {
 252                   key4_0.remote = ip4_0->dst_address.as_u32;
 253                   key4_0.vni = geneve0->vni;
 254                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 255                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 256                   if (PREDICT_TRUE (p0 != NULL))
 257                     {
 258                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 259                       goto next0;       /* valid packet */
 260                     }
 261                 }
 262               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 263               next0 = GENEVE_INPUT_NEXT_DROP;
 264               goto trace0;
 265
 266             }
 267           else                  /* !is_ip4 */
 268             {
 269               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 270               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 271               key6_0.vni = geneve0->vni;
 272
 273               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 274               if (PREDICT_FALSE
 275                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 276                 {
 277                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 278                   if (PREDICT_FALSE (p0 == NULL))
 279                     {
 280                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 281                       next0 = GENEVE_INPUT_NEXT_DROP;
 282                       goto trace0;
 283                     }
 284                   clib_memcpy (&last_key6, &key6_0, sizeof (key6_0));
 285                   tunnel_index0 = last_tunnel_index = p0[0];
 286                 }
 287               else
 288                 tunnel_index0 = last_tunnel_index;
 289               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 290
 291               /* Validate GENEVE tunnel encap-fib index agaist packet */
 292               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 293                 {
 294                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 295                   next0 = GENEVE_INPUT_NEXT_DROP;
 296                   goto trace0;
 297                 }
 298
 299               /* Validate GENEVE tunnel SIP against packet DIP */
 300               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 301                                                       &t0->local.ip6)))
 302                 goto next0;     /* valid packet */
 303               if (PREDICT_FALSE
 304                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 305                 {
 306                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 307                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 308                   key6_0.vni = geneve0->vni;
 309                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 310                   if (PREDICT_TRUE (p0 != NULL))
 311                     {
 312                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 313                       goto next0;       /* valid packet */
 314                     }
 315                 }
 316               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 317               next0 = GENEVE_INPUT_NEXT_DROP;
 318               goto trace0;
 319             }
 320
 321         next0:
 322           next0 = t0->decap_next_index;
 323           sw_if_index0 = t0->sw_if_index;
 324           len0 = vlib_buffer_length_in_chain (vm, b0);
 325
 326           /* Required to make the l2 tag push / pop code work on l2 subifs */
 327           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 328             vnet_update_l2_len (b0);
 329
 330           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 331           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 332           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 333
 334           pkts_decapsulated++;
 335           stats_n_packets += 1;
 336           stats_n_bytes += len0;
 337
 338           /* Batch stats increment on the same geneve tunnel so counter
 339              is not incremented per packet */
 340           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 341             {
 342               stats_n_packets -= 1;
 343               stats_n_bytes -= len0;
 344               if (stats_n_packets)
 345                 vlib_increment_combined_counter
 346                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 347                    thread_index, stats_sw_if_index,
 348                    stats_n_packets, stats_n_bytes);
 349               stats_n_packets = 1;
 350               stats_n_bytes = len0;
 351               stats_sw_if_index = sw_if_index0;
 352             }
 353
 354         trace0:
 355           b0->error = error0 ? node->errors[error0] : 0;
 356
 357           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 358             {
 359               geneve_rx_trace_t *tr
 360                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 361               tr->next_index = next0;
 362               tr->error = error0;
 363               tr->tunnel_index = tunnel_index0;
 364               tr->vni = vnet_get_geneve_vni (geneve0);
 365             }
 366
 367           if (PREDICT_FALSE (geneve1->ver != GENEVE_VERSION))
 368             {
 369               error1 = GENEVE_ERROR_BAD_FLAGS;
 370               next1 = GENEVE_INPUT_NEXT_DROP;
 371               goto trace1;
 372             }
 373 #if SUPPORT_OPTIONS_HEADER==0
 374           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve1) == 1))
 375             {
 376               error1 = GENEVE_ERROR_BAD_FLAGS;
 377               next1 = GENEVE_INPUT_NEXT_DROP;
 378               goto trace1;
 379             }
 380 #endif
 381           if (is_ip4)
 382             {
 383               key4_1.remote = ip4_1->src_address.as_u32;
 384               key4_1.vni = geneve1->vni;
 385
 386               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 387               if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
 388                 {
 389                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 390                   if (PREDICT_FALSE (p1 == NULL))
 391                     {
 392                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 393                       next1 = GENEVE_INPUT_NEXT_DROP;
 394                       goto trace1;
 395                     }
 396                   last_key4.as_u64 = key4_1.as_u64;
 397                   tunnel_index1 = last_tunnel_index = p1[0];
 398                 }
 399               else
 400                 tunnel_index1 = last_tunnel_index;
 401               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 402
 403               /* Validate GENEVE tunnel encap-fib index agaist packet */
 404               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 405                 {
 406                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 407                   next1 = GENEVE_INPUT_NEXT_DROP;
 408                   goto trace1;
 409                 }
 410
 411               /* Validate GENEVE tunnel SIP against packet DIP */
 412               if (PREDICT_TRUE
 413                   (ip4_1->dst_address.as_u32 == t1->local.ip4.as_u32))
 414                 goto next1;     /* valid packet */
 415               if (PREDICT_FALSE
 416                   (ip4_address_is_multicast (&ip4_1->dst_address)))
 417                 {
 418                   key4_1.remote = ip4_1->dst_address.as_u32;
 419                   key4_1.vni = geneve1->vni;
 420                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 421                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 422                   if (PREDICT_TRUE (p1 != NULL))
 423                     {
 424                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 425                       goto next1;       /* valid packet */
 426                     }
 427                 }
 428               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 429               next1 = GENEVE_INPUT_NEXT_DROP;
 430               goto trace1;
 431
 432             }
 433           else                  /* !is_ip4 */
 434             {
 435               key6_1.remote.as_u64[0] = ip6_1->src_address.as_u64[0];
 436               key6_1.remote.as_u64[1] = ip6_1->src_address.as_u64[1];
 437               key6_1.vni = geneve1->vni;
 438
 439               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 440               if (PREDICT_FALSE
 441                   (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
 442                 {
 443                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 444
 445                   if (PREDICT_FALSE (p1 == NULL))
 446                     {
 447                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 448                       next1 = GENEVE_INPUT_NEXT_DROP;
 449                       goto trace1;
 450                     }
 451
 452                   clib_memcpy (&last_key6, &key6_1, sizeof (key6_1));
 453                   tunnel_index1 = last_tunnel_index = p1[0];
 454                 }
 455               else
 456                 tunnel_index1 = last_tunnel_index;
 457               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 458
 459               /* Validate GENEVE tunnel encap-fib index agaist packet */
 460               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 461                 {
 462                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 463                   next1 = GENEVE_INPUT_NEXT_DROP;
 464                   goto trace1;
 465                 }
 466
 467               /* Validate GENEVE tunnel SIP against packet DIP */
 468               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
 469                                                       &t1->local.ip6)))
 470                 goto next1;     /* valid packet */
 471               if (PREDICT_FALSE
 472                   (ip6_address_is_multicast (&ip6_1->dst_address)))
 473                 {
 474                   key6_1.remote.as_u64[0] = ip6_1->dst_address.as_u64[0];
 475                   key6_1.remote.as_u64[1] = ip6_1->dst_address.as_u64[1];
 476                   key6_1.vni = geneve1->vni;
 477                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 478                   if (PREDICT_TRUE (p1 != NULL))
 479                     {
 480                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 481                       goto next1;       /* valid packet */
 482                     }
 483                 }
 484               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 485               next1 = GENEVE_INPUT_NEXT_DROP;
 486               goto trace1;
 487             }
 488
 489         next1:
 490           next1 = t1->decap_next_index;
 491           sw_if_index1 = t1->sw_if_index;
 492           len1 = vlib_buffer_length_in_chain (vm, b1);
 493
 494           /* Required to make the l2 tag push / pop code work on l2 subifs */
 495           if (PREDICT_TRUE (next1 == GENEVE_INPUT_NEXT_L2_INPUT))
 496             vnet_update_l2_len (b1);
 497
 498           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 499           vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;
 500           sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
 501
 502           pkts_decapsulated++;
 503           stats_n_packets += 1;
 504           stats_n_bytes += len1;
 505
 506           /* Batch stats increment on the same geneve tunnel so counter
 507              is not incremented per packet */
 508           if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
 509             {
 510               stats_n_packets -= 1;
 511               stats_n_bytes -= len1;
 512               if (stats_n_packets)
 513                 vlib_increment_combined_counter
 514                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 515                    thread_index, stats_sw_if_index,
 516                    stats_n_packets, stats_n_bytes);
 517               stats_n_packets = 1;
 518               stats_n_bytes = len1;
 519               stats_sw_if_index = sw_if_index1;
 520             }
 521
 522         trace1:
 523           b1->error = error1 ? node->errors[error1] : 0;
 524
 525           if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 526             {
 527               geneve_rx_trace_t *tr
 528                 = vlib_add_trace (vm, node, b1, sizeof (*tr));
 529               tr->next_index = next1;
 530               tr->error = error1;
 531               tr->tunnel_index = tunnel_index1;
 532               tr->vni = vnet_get_geneve_vni (geneve1);
 533             }
 534
 535           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 536                                            to_next, n_left_to_next,
 537                                            bi0, bi1, next0, next1);
 538         }
 539
 540       while (n_left_from > 0 && n_left_to_next > 0)
 541         {
 542           u32 bi0;
 543           vlib_buffer_t *b0;
 544           u32 next0;
 545           ip4_header_t *ip4_0;
 546           ip6_header_t *ip6_0;
 547           geneve_header_t *geneve0;
 548           uword *p0;
 549           u32 tunnel_index0;
 550           geneve_tunnel_t *t0, *mt0 = NULL;
 551           geneve4_tunnel_key_t key4_0;
 552           geneve6_tunnel_key_t key6_0;
 553           u32 error0;
 554           u32 sw_if_index0, len0;
 555
 556           bi0 = from[0];
 557           to_next[0] = bi0;
 558           from += 1;
 559           to_next += 1;
 560           n_left_from -= 1;
 561           n_left_to_next -= 1;
 562
 563           b0 = vlib_get_buffer (vm, bi0);
 564
 565           /* udp leaves current_data pointing at the geneve header */
 566           geneve0 = vlib_buffer_get_current (b0);
 567           if (is_ip4)
 568             {
 569               vlib_buffer_advance
 570                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 571               ip4_0 = vlib_buffer_get_current (b0);
 572             }
 573           else
 574             {
 575               vlib_buffer_advance
 576                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 577               ip6_0 = vlib_buffer_get_current (b0);
 578             }
 579
 580           /* pop (ip, udp, geneve) */
 581           if (is_ip4)
 582             {
 583               vlib_buffer_advance
 584                 (b0,
 585                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 586                  GENEVE_BASE_HEADER_LENGTH +
 587                  vnet_get_geneve_options_len (geneve0));
 588             }
 589           else
 590             {
 591               vlib_buffer_advance
 592                 (b0,
 593                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 594                  GENEVE_BASE_HEADER_LENGTH +
 595                  vnet_get_geneve_options_len (geneve0));
 596             }
 597
 598           tunnel_index0 = ~0;
 599           error0 = 0;
 600
 601           if (PREDICT_FALSE (geneve0->ver != GENEVE_VERSION))
 602             {
 603               error0 = GENEVE_ERROR_BAD_FLAGS;
 604               next0 = GENEVE_INPUT_NEXT_DROP;
 605               goto trace00;
 606             }
 607 #if SUPPORT_OPTIONS_HEADER==0
 608           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 609             {
 610               error0 = GENEVE_ERROR_BAD_FLAGS;
 611               next0 = GENEVE_INPUT_NEXT_DROP;
 612               goto trace00;
 613             }
 614 #endif
 615           if (is_ip4)
 616             {
 617               key4_0.remote = ip4_0->src_address.as_u32;
 618               key4_0.vni = geneve0->vni;
 619
 620               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 621               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 622                 {
 623                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 624                   if (PREDICT_FALSE (p0 == NULL))
 625                     {
 626                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 627                       next0 = GENEVE_INPUT_NEXT_DROP;
 628                       goto trace00;
 629                     }
 630                   last_key4.as_u64 = key4_0.as_u64;
 631                   tunnel_index0 = last_tunnel_index = p0[0];
 632                 }
 633               else
 634                 tunnel_index0 = last_tunnel_index;
 635               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 636
 637               /* Validate GENEVE tunnel encap-fib index agaist packet */
 638               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 639                 {
 640                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 641                   next0 = GENEVE_INPUT_NEXT_DROP;
 642                   goto trace00;
 643                 }
 644
 645               /* Validate GENEVE tunnel SIP against packet DIP */
 646               if (PREDICT_TRUE
 647                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 648                 goto next00;    /* valid packet */
 649               if (PREDICT_FALSE
 650                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 651                 {
 652                   key4_0.remote = ip4_0->dst_address.as_u32;
 653                   key4_0.vni = geneve0->vni;
 654                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 655                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 656                   if (PREDICT_TRUE (p0 != NULL))
 657                     {
 658                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 659                       goto next00;      /* valid packet */
 660                     }
 661                 }
 662               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 663               next0 = GENEVE_INPUT_NEXT_DROP;
 664               goto trace00;
 665
 666             }
 667           else                  /* !is_ip4 */
 668             {
 669               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 670               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 671               key6_0.vni = geneve0->vni;
 672
 673               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 674               if (PREDICT_FALSE
 675                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 676                 {
 677                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 678                   if (PREDICT_FALSE (p0 == NULL))
 679                     {
 680                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 681                       next0 = GENEVE_INPUT_NEXT_DROP;
 682                       goto trace00;
 683                     }
 684                   clib_memcpy (&last_key6, &key6_0, sizeof (key6_0));
 685                   tunnel_index0 = last_tunnel_index = p0[0];
 686                 }
 687               else
 688                 tunnel_index0 = last_tunnel_index;
 689               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 690
 691               /* Validate GENEVE tunnel encap-fib index agaist packet */
 692               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 693                 {
 694                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 695                   next0 = GENEVE_INPUT_NEXT_DROP;
 696                   goto trace00;
 697                 }
 698
 699               /* Validate GENEVE tunnel SIP against packet DIP */
 700               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 701                                                       &t0->local.ip6)))
 702                 goto next00;    /* valid packet */
 703               if (PREDICT_FALSE
 704                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 705                 {
 706                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 707                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 708                   key6_0.vni = geneve0->vni;
 709                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 710                   if (PREDICT_TRUE (p0 != NULL))
 711                     {
 712                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 713                       goto next00;      /* valid packet */
 714                     }
 715                 }
 716               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 717               next0 = GENEVE_INPUT_NEXT_DROP;
 718               goto trace00;
 719             }
 720
 721         next00:
 722           next0 = t0->decap_next_index;
 723           sw_if_index0 = t0->sw_if_index;
 724           len0 = vlib_buffer_length_in_chain (vm, b0);
 725
 726           /* Required to make the l2 tag push / pop code work on l2 subifs */
 727           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 728             vnet_update_l2_len (b0);
 729
 730           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 731           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 732           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 733
 734           pkts_decapsulated++;
 735           stats_n_packets += 1;
 736           stats_n_bytes += len0;
 737
 738           /* Batch stats increment on the same geneve tunnel so counter
 739              is not incremented per packet */
 740           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 741             {
 742               stats_n_packets -= 1;
 743               stats_n_bytes -= len0;
 744               if (stats_n_packets)
 745                 vlib_increment_combined_counter
 746                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 747                    thread_index, stats_sw_if_index,
 748                    stats_n_packets, stats_n_bytes);
 749               stats_n_packets = 1;
 750               stats_n_bytes = len0;
 751               stats_sw_if_index = sw_if_index0;
 752             }
 753
 754         trace00:
 755           b0->error = error0 ? node->errors[error0] : 0;
 756
 757           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 758             {
 759               geneve_rx_trace_t *tr
 760                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 761               tr->next_index = next0;
 762               tr->error = error0;
 763               tr->tunnel_index = tunnel_index0;
 764               tr->vni = vnet_get_geneve_vni (geneve0);
 765             }
 766           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 767                                            to_next, n_left_to_next,
 768                                            bi0, next0);
 769         }
 770
 771       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 772     }
 773   /* Do we still need this now that tunnel tx stats is kept? */
 774   vlib_node_increment_counter (vm, is_ip4 ?
 775                                geneve4_input_node.
 776                                index : geneve6_input_node.index,
 777                                GENEVE_ERROR_DECAPSULATED, pkts_decapsulated);
 778
 779   /* Increment any remaining batch stats */
 780   if (stats_n_packets)
 781     {
 782       vlib_increment_combined_counter
 783         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 784          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 785       node->runtime_data[0] = stats_sw_if_index;
 786     }
 787
 788   return from_frame->n_vectors;
 789 }
 790
 791 static uword
 792 geneve4_input (vlib_main_t * vm,
 793                vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 794 {
 795   return geneve_input (vm, node, from_frame, /* is_ip4 */ 1);
 796 }
 797
 798 static uword
 799 geneve6_input (vlib_main_t * vm,
 800                vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 801 {
 802   return geneve_input (vm, node, from_frame, /* is_ip4 */ 0);
 803 }
 804
 805 static char *geneve_error_strings[] = {
 806 #define geneve_error(n,s) s,
 807 #include <vnet/geneve/geneve_error.def>
 808 #undef geneve_error
 809 #undef _
 810 };
 811
 812 /* *INDENT-OFF* */
 813 VLIB_REGISTER_NODE (geneve4_input_node) = {
 814   .function = geneve4_input,
 815   .name = "geneve4-input",
 816   /* Takes a vector of packets. */
 817   .vector_size = sizeof (u32),
 818   .n_errors = GENEVE_N_ERROR,
 819   .error_strings = geneve_error_strings,
 820   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 821   .next_nodes = {
 822 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 823     foreach_geneve_input_next
 824 #undef _
 825   },
 826
 827 //temp  .format_buffer = format_geneve_header,
 828   .format_trace = format_geneve_rx_trace,
 829   // $$$$ .unformat_buffer = unformat_geneve_header,
 830 };
 831
 832 VLIB_NODE_FUNCTION_MULTIARCH (geneve4_input_node, geneve4_input)
 833
 834 VLIB_REGISTER_NODE (geneve6_input_node) = {
 835   .function = geneve6_input,
 836   .name = "geneve6-input",
 837   /* Takes a vector of packets. */
 838   .vector_size = sizeof (u32),
 839   .n_errors = GENEVE_N_ERROR,
 840   .error_strings = geneve_error_strings,
 841   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 842   .next_nodes = {
 843 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 844   foreach_geneve_input_next
 845 #undef _
 846   },
 847 //temp  .format_buffer = format_geneve_header,
 848   .format_trace = format_geneve_rx_trace,
 849   // $$$$ .unformat_buffer = unformat_geneve_header,
 850 };
 851
 852 VLIB_NODE_FUNCTION_MULTIARCH (geneve6_input_node, geneve6_input)
 853 /* *INDENT-ON* */
 854
 855 typedef enum
 856 {
 857   IP_GENEVE_BYPASS_NEXT_DROP,
 858   IP_GENEVE_BYPASS_NEXT_GENEVE,
 859   IP_GENEVE_BYPASS_N_NEXT,
 860 } ip_vxan_bypass_next_t;
 861
 862 always_inline uword
 863 ip_geneve_bypass_inline (vlib_main_t * vm,
 864                          vlib_node_runtime_t * node,
 865                          vlib_frame_t * frame, u32 is_ip4)
 866 {
 867   geneve_main_t *vxm = &geneve_main;
 868   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
 869   vlib_node_runtime_t *error_node =
 870     vlib_node_get_runtime (vm, ip4_input_node.index);
 871   ip4_address_t addr4;          /* last IPv4 address matching a local VTEP address */
 872   ip6_address_t addr6;          /* last IPv6 address matching a local VTEP address */
 873
 874   from = vlib_frame_vector_args (frame);
 875   n_left_from = frame->n_vectors;
 876   next_index = node->cached_next_index;
 877
 878   if (node->flags & VLIB_NODE_FLAG_TRACE)
 879     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 880
 881   if (is_ip4)
 882     addr4.data_u32 = ~0;
 883   else
 884     ip6_address_set_zero (&addr6);
 885
 886   while (n_left_from > 0)
 887     {
 888       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 889
 890       while (n_left_from >= 4 && n_left_to_next >= 2)
 891         {
 892           vlib_buffer_t *b0, *b1;
 893           ip4_header_t *ip40, *ip41;
 894           ip6_header_t *ip60, *ip61;
 895           udp_header_t *udp0, *udp1;
 896           u32 bi0, ip_len0, udp_len0, flags0, next0;
 897           u32 bi1, ip_len1, udp_len1, flags1, next1;
 898           i32 len_diff0, len_diff1;
 899           u8 error0, good_udp0, proto0;
 900           u8 error1, good_udp1, proto1;
 901
 902           /* Prefetch next iteration. */
 903           {
 904             vlib_buffer_t *p2, *p3;
 905
 906             p2 = vlib_get_buffer (vm, from[2]);
 907             p3 = vlib_get_buffer (vm, from[3]);
 908
 909             vlib_prefetch_buffer_header (p2, LOAD);
 910             vlib_prefetch_buffer_header (p3, LOAD);
 911
 912             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 913             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 914           }
 915
 916           bi0 = to_next[0] = from[0];
 917           bi1 = to_next[1] = from[1];
 918           from += 2;
 919           n_left_from -= 2;
 920           to_next += 2;
 921           n_left_to_next -= 2;
 922
 923           b0 = vlib_get_buffer (vm, bi0);
 924           b1 = vlib_get_buffer (vm, bi1);
 925           if (is_ip4)
 926             {
 927               ip40 = vlib_buffer_get_current (b0);
 928               ip41 = vlib_buffer_get_current (b1);
 929             }
 930           else
 931             {
 932               ip60 = vlib_buffer_get_current (b0);
 933               ip61 = vlib_buffer_get_current (b1);
 934             }
 935
 936           /* Setup packet for next IP feature */
 937           vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX], &next0,
 938                              b0);
 939           vnet_feature_next (vnet_buffer (b1)->sw_if_index[VLIB_RX], &next1,
 940                              b1);
 941
 942           if (is_ip4)
 943             {
 944               /* Treat IP frag packets as "experimental" protocol for now
 945                  until support of IP frag reassembly is implemented */
 946               proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
 947               proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
 948             }
 949           else
 950             {
 951               proto0 = ip60->protocol;
 952               proto1 = ip61->protocol;
 953             }
 954
 955           /* Process packet 0 */
 956           if (proto0 != IP_PROTOCOL_UDP)
 957             goto exit0;         /* not UDP packet */
 958
 959           if (is_ip4)
 960             udp0 = ip4_next_header (ip40);
 961           else
 962             udp0 = ip6_next_header (ip60);
 963
 964           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
 965             goto exit0;         /* not GENEVE packet */
 966
 967           /* Validate DIP against VTEPs */
 968           if (is_ip4)
 969             {
 970               if (addr4.as_u32 != ip40->dst_address.as_u32)
 971                 {
 972                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
 973                     goto exit0; /* no local VTEP for GENEVE packet */
 974                   addr4 = ip40->dst_address;
 975                 }
 976             }
 977           else
 978             {
 979               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
 980                 {
 981                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
 982                     goto exit0; /* no local VTEP for GENEVE packet */
 983                   addr6 = ip60->dst_address;
 984                 }
 985             }
 986
 987           flags0 = b0->flags;
 988           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
 989
 990           /* Don't verify UDP checksum for packets with explicit zero checksum. */
 991           good_udp0 |= udp0->checksum == 0;
 992
 993           /* Verify UDP length */
 994           if (is_ip4)
 995             ip_len0 = clib_net_to_host_u16 (ip40->length);
 996           else
 997             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
 998           udp_len0 = clib_net_to_host_u16 (udp0->length);
 999           len_diff0 = ip_len0 - udp_len0;
1000
1001           /* Verify UDP checksum */
1002           if (PREDICT_FALSE (!good_udp0))
1003             {
1004               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1005                 {
1006                   if (is_ip4)
1007                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1008                   else
1009                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1010                   good_udp0 =
1011                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1012                 }
1013             }
1014
1015           if (is_ip4)
1016             {
1017               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1018               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1019             }
1020           else
1021             {
1022               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1023               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1024             }
1025
1026           next0 = error0 ?
1027             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1028           b0->error = error0 ? error_node->errors[error0] : 0;
1029
1030           /* geneve-input node expect current at GENEVE header */
1031           if (is_ip4)
1032             vlib_buffer_advance (b0,
1033                                  sizeof (ip4_header_t) +
1034                                  sizeof (udp_header_t));
1035           else
1036             vlib_buffer_advance (b0,
1037                                  sizeof (ip6_header_t) +
1038                                  sizeof (udp_header_t));
1039
1040         exit0:
1041           /* Process packet 1 */
1042           if (proto1 != IP_PROTOCOL_UDP)
1043             goto exit1;         /* not UDP packet */
1044
1045           if (is_ip4)
1046             udp1 = ip4_next_header (ip41);
1047           else
1048             udp1 = ip6_next_header (ip61);
1049
1050           if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1051             goto exit1;         /* not GENEVE packet */
1052
1053           /* Validate DIP against VTEPs */
1054           if (is_ip4)
1055             {
1056               if (addr4.as_u32 != ip41->dst_address.as_u32)
1057                 {
1058                   if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
1059                     goto exit1; /* no local VTEP for GENEVE packet */
1060                   addr4 = ip41->dst_address;
1061                 }
1062             }
1063           else
1064             {
1065               if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
1066                 {
1067                   if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
1068                     goto exit1; /* no local VTEP for GENEVE packet */
1069                   addr6 = ip61->dst_address;
1070                 }
1071             }
1072
1073           flags1 = b1->flags;
1074           good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1075
1076           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1077           good_udp1 |= udp1->checksum == 0;
1078
1079           /* Verify UDP length */
1080           if (is_ip4)
1081             ip_len1 = clib_net_to_host_u16 (ip41->length);
1082           else
1083             ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
1084           udp_len1 = clib_net_to_host_u16 (udp1->length);
1085           len_diff1 = ip_len1 - udp_len1;
1086
1087           /* Verify UDP checksum */
1088           if (PREDICT_FALSE (!good_udp1))
1089             {
1090               if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1091                 {
1092                   if (is_ip4)
1093                     flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
1094                   else
1095                     flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
1096                   good_udp1 =
1097                     (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1098                 }
1099             }
1100
1101           if (is_ip4)
1102             {
1103               error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1104               error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
1105             }
1106           else
1107             {
1108               error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1109               error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
1110             }
1111
1112           next1 = error1 ?
1113             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1114           b1->error = error1 ? error_node->errors[error1] : 0;
1115
1116           /* geneve-input node expect current at GENEVE header */
1117           if (is_ip4)
1118             vlib_buffer_advance (b1,
1119                                  sizeof (ip4_header_t) +
1120                                  sizeof (udp_header_t));
1121           else
1122             vlib_buffer_advance (b1,
1123                                  sizeof (ip6_header_t) +
1124                                  sizeof (udp_header_t));
1125
1126         exit1:
1127           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1128                                            to_next, n_left_to_next,
1129                                            bi0, bi1, next0, next1);
1130         }
1131
1132       while (n_left_from > 0 && n_left_to_next > 0)
1133         {
1134           vlib_buffer_t *b0;
1135           ip4_header_t *ip40;
1136           ip6_header_t *ip60;
1137           udp_header_t *udp0;
1138           u32 bi0, ip_len0, udp_len0, flags0, next0;
1139           i32 len_diff0;
1140           u8 error0, good_udp0, proto0;
1141
1142           bi0 = to_next[0] = from[0];
1143           from += 1;
1144           n_left_from -= 1;
1145           to_next += 1;
1146           n_left_to_next -= 1;
1147
1148           b0 = vlib_get_buffer (vm, bi0);
1149           if (is_ip4)
1150             ip40 = vlib_buffer_get_current (b0);
1151           else
1152             ip60 = vlib_buffer_get_current (b0);
1153
1154           /* Setup packet for next IP feature */
1155           vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX], &next0,
1156                              b0);
1157
1158           if (is_ip4)
1159             /* Treat IP4 frag packets as "experimental" protocol for now
1160                until support of IP frag reassembly is implemented */
1161             proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
1162           else
1163             proto0 = ip60->protocol;
1164
1165           if (proto0 != IP_PROTOCOL_UDP)
1166             goto exit;          /* not UDP packet */
1167
1168           if (is_ip4)
1169             udp0 = ip4_next_header (ip40);
1170           else
1171             udp0 = ip6_next_header (ip60);
1172
1173           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1174             goto exit;          /* not GENEVE packet */
1175
1176           /* Validate DIP against VTEPs */
1177           if (is_ip4)
1178             {
1179               if (addr4.as_u32 != ip40->dst_address.as_u32)
1180                 {
1181                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
1182                     goto exit;  /* no local VTEP for GENEVE packet */
1183                   addr4 = ip40->dst_address;
1184                 }
1185             }
1186           else
1187             {
1188               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
1189                 {
1190                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
1191                     goto exit;  /* no local VTEP for GENEVE packet */
1192                   addr6 = ip60->dst_address;
1193                 }
1194             }
1195
1196           flags0 = b0->flags;
1197           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1198
1199           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1200           good_udp0 |= udp0->checksum == 0;
1201
1202           /* Verify UDP length */
1203           if (is_ip4)
1204             ip_len0 = clib_net_to_host_u16 (ip40->length);
1205           else
1206             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
1207           udp_len0 = clib_net_to_host_u16 (udp0->length);
1208           len_diff0 = ip_len0 - udp_len0;
1209
1210           /* Verify UDP checksum */
1211           if (PREDICT_FALSE (!good_udp0))
1212             {
1213               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1214                 {
1215                   if (is_ip4)
1216                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1217                   else
1218                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1219                   good_udp0 =
1220                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1221                 }
1222             }
1223
1224           if (is_ip4)
1225             {
1226               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1227               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1228             }
1229           else
1230             {
1231               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1232               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1233             }
1234
1235           next0 = error0 ?
1236             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1237           b0->error = error0 ? error_node->errors[error0] : 0;
1238
1239           /* geneve-input node expect current at GENEVE header */
1240           if (is_ip4)
1241             vlib_buffer_advance (b0,
1242                                  sizeof (ip4_header_t) +
1243                                  sizeof (udp_header_t));
1244           else
1245             vlib_buffer_advance (b0,
1246                                  sizeof (ip6_header_t) +
1247                                  sizeof (udp_header_t));
1248
1249         exit:
1250           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1251                                            to_next, n_left_to_next,
1252                                            bi0, next0);
1253         }
1254
1255       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1256     }
1257
1258   return frame->n_vectors;
1259 }
1260
1261 static uword
1262 ip4_geneve_bypass (vlib_main_t * vm,
1263                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1264 {
1265   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
1266 }
1267
1268 /* *INDENT-OFF* */
1269 VLIB_REGISTER_NODE (ip4_geneve_bypass_node) =
1270 {
1271   .function = ip4_geneve_bypass,.name = "ip4-geneve-bypass",.vector_size =
1272     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1273   {
1274   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1275       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve4-input",}
1276 ,.format_buffer = format_ip4_header,.format_trace =
1277     format_ip4_forward_next_trace,};
1278
1279 VLIB_NODE_FUNCTION_MULTIARCH (ip4_geneve_bypass_node, ip4_geneve_bypass)
1280 /* Dummy init function to get us linked in. */
1281      clib_error_t *ip4_geneve_bypass_init (vlib_main_t * vm)
1282 {
1283   return 0;
1284 }
1285
1286 VLIB_INIT_FUNCTION (ip4_geneve_bypass_init);
1287 /* *INDENT-ON* */
1288
1289 static uword
1290 ip6_geneve_bypass (vlib_main_t * vm,
1291                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1292 {
1293   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
1294 }
1295
1296 /* *INDENT-OFF* */
1297 VLIB_REGISTER_NODE (ip6_geneve_bypass_node) =
1298 {
1299   .function = ip6_geneve_bypass,.name = "ip6-geneve-bypass",.vector_size =
1300     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1301   {
1302   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1303       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve6-input",}
1304 ,.format_buffer = format_ip6_header,.format_trace =
1305     format_ip6_forward_next_trace,};
1306 /* *INDENT-ON* */
1307
1308 VLIB_NODE_FUNCTION_MULTIARCH (ip6_geneve_bypass_node, ip6_geneve_bypass)
1309 /* Dummy init function to get us linked in. */
1310      clib_error_t *ip6_geneve_bypass_init (vlib_main_t * vm)
1311 {
1312   return 0;
1313 }
1314
1315 VLIB_INIT_FUNCTION (ip6_geneve_bypass_init);
1316
1317 /*
1318  * fd.io coding-style-patch-verification: ON
1319  *
1320  * Local Variables:
1321  * eval: (c-set-style "gnu")
1322  * End:
1323  */