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 typedef struct
  21 {
  22   u32 next_index;
  23   u32 tunnel_index;
  24   u32 error;
  25   u32 vni_rsvd;
  26 } geneve_rx_trace_t;
  27
  28 static u8 *
  29 format_geneve_rx_trace (u8 * s, va_list * args)
  30 {
  31   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  32   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  33   geneve_rx_trace_t *t = va_arg (*args, geneve_rx_trace_t *);
  34
  35   if (t->tunnel_index != ~0)
  36     {
  37       s =
  38         format (s,
  39                 "GENEVE decap from geneve_tunnel%d vni %d next %d error %d",
  40                 t->tunnel_index, t->vni_rsvd, t->next_index, t->error);
  41     }
  42   else
  43     {
  44       s = format (s, "GENEVE decap error - tunnel for vni %d does not exist",
  45                   t->vni_rsvd);
  46     }
  47   return s;
  48 }
  49
  50 always_inline u32
  51 validate_geneve_fib (vlib_buffer_t * b, geneve_tunnel_t * t, u32 is_ip4)
  52 {
  53   u32 fib_index, sw_if_index;
  54
  55   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
  56
  57   if (is_ip4)
  58     fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
  59       vec_elt (ip4_main.fib_index_by_sw_if_index, sw_if_index) :
  60       vnet_buffer (b)->sw_if_index[VLIB_TX];
  61   else
  62     fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
  63       vec_elt (ip6_main.fib_index_by_sw_if_index, sw_if_index) :
  64       vnet_buffer (b)->sw_if_index[VLIB_TX];
  65
  66   return (fib_index == t->encap_fib_index);
  67 }
  68
  69 always_inline uword
  70 geneve_input (vlib_main_t * vm,
  71               vlib_node_runtime_t * node,
  72               vlib_frame_t * from_frame, u32 is_ip4)
  73 {
  74   u32 n_left_from, next_index, *from, *to_next;
  75   geneve_main_t *vxm = &geneve_main;
  76   vnet_main_t *vnm = vxm->vnet_main;
  77   vnet_interface_main_t *im = &vnm->interface_main;
  78   u32 last_tunnel_index = ~0;
  79   geneve4_tunnel_key_t last_key4;
  80   geneve6_tunnel_key_t last_key6;
  81   u32 pkts_decapsulated = 0;
  82   u32 thread_index = vm->thread_index;
  83   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
  84   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
  85
  86   if (is_ip4)
  87     last_key4.as_u64 = ~0;
  88   else
  89     clib_memset (&last_key6, 0xff, sizeof (last_key6));
  90
  91   from = vlib_frame_vector_args (from_frame);
  92   n_left_from = from_frame->n_vectors;
  93   vlib_get_buffers (vm, from, bufs, n_left_from);
  94
  95   next_index = node->cached_next_index;
  96   stats_sw_if_index = node->runtime_data[0];
  97   stats_n_packets = stats_n_bytes = 0;
  98
  99   while (n_left_from > 0)
 100     {
 101       u32 n_left_to_next;
 102
 103       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 104       while (n_left_from >= 4 && n_left_to_next >= 2)
 105         {
 106           u32 bi0, bi1;
 107           vlib_buffer_t *b0, *b1;
 108           u32 next0, next1;
 109           ip4_header_t *ip4_0, *ip4_1;
 110           ip6_header_t *ip6_0, *ip6_1;
 111           geneve_header_t *geneve0, *geneve1;
 112           uword *p0, *p1;
 113           u32 tunnel_index0, tunnel_index1;
 114           geneve_tunnel_t *t0, *t1, *mt0 = NULL, *mt1 = NULL;
 115           geneve4_tunnel_key_t key4_0, key4_1;
 116           geneve6_tunnel_key_t key6_0, key6_1;
 117           u32 error0, error1;
 118           u32 sw_if_index0, sw_if_index1, len0, len1;
 119
 120           /* Prefetch next iteration. */
 121           {
 122             vlib_prefetch_buffer_header (b[2], LOAD);
 123             vlib_prefetch_buffer_header (b[3], LOAD);
 124
 125             CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 126             CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 127           }
 128
 129           bi0 = from[0];
 130           bi1 = from[1];
 131           to_next[0] = bi0;
 132           to_next[1] = bi1;
 133           from += 2;
 134           to_next += 2;
 135           n_left_to_next -= 2;
 136           n_left_from -= 2;
 137
 138           b0 = b[0];
 139           b1 = b[1];
 140           b += 2;
 141
 142           /* udp leaves current_data pointing at the geneve header */
 143           geneve0 = vlib_buffer_get_current (b0);
 144           geneve1 = vlib_buffer_get_current (b1);
 145
 146           vnet_geneve_hdr_1word_ntoh (geneve0);
 147           vnet_geneve_hdr_1word_ntoh (geneve1);
 148
 149           if (is_ip4)
 150             {
 151               vlib_buffer_advance
 152                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 153               vlib_buffer_advance
 154                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 155               ip4_0 = vlib_buffer_get_current (b0);
 156               ip4_1 = vlib_buffer_get_current (b1);
 157             }
 158           else
 159             {
 160               vlib_buffer_advance
 161                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 162               vlib_buffer_advance
 163                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 164               ip6_0 = vlib_buffer_get_current (b0);
 165               ip6_1 = vlib_buffer_get_current (b1);
 166             }
 167
 168           /* pop (ip, udp, geneve) */
 169           if (is_ip4)
 170             {
 171               vlib_buffer_advance (b0,
 172                                    sizeof (*ip4_0) + sizeof (udp_header_t) +
 173                                    GENEVE_BASE_HEADER_LENGTH +
 174                                    vnet_get_geneve_options_len (geneve0));
 175               vlib_buffer_advance (b1,
 176                                    sizeof (*ip4_1) + sizeof (udp_header_t) +
 177                                    GENEVE_BASE_HEADER_LENGTH +
 178                                    vnet_get_geneve_options_len (geneve1));
 179             }
 180           else
 181             {
 182               vlib_buffer_advance (b0,
 183                                    sizeof (*ip6_0) + sizeof (udp_header_t) +
 184                                    GENEVE_BASE_HEADER_LENGTH +
 185                                    vnet_get_geneve_options_len (geneve0));
 186               vlib_buffer_advance (b1,
 187                                    sizeof (*ip6_1) + sizeof (udp_header_t) +
 188                                    GENEVE_BASE_HEADER_LENGTH +
 189                                    vnet_get_geneve_options_len (geneve1));
 190             }
 191
 192           tunnel_index0 = ~0;
 193           error0 = 0;
 194
 195           tunnel_index1 = ~0;
 196           error1 = 0;
 197
 198           if (PREDICT_FALSE
 199               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 200             {
 201               error0 = GENEVE_ERROR_BAD_FLAGS;
 202               next0 = GENEVE_INPUT_NEXT_DROP;
 203               goto trace0;
 204             }
 205 #if SUPPORT_OPTIONS_HEADER==1
 206           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 207             {
 208               error0 = GENEVE_ERROR_BAD_FLAGS;
 209               next0 = GENEVE_INPUT_NEXT_DROP;
 210               goto trace0;
 211             }
 212 #endif
 213           if (is_ip4)
 214             {
 215               key4_0.remote = ip4_0->src_address.as_u32;
 216               key4_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 217
 218               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 219               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 220                 {
 221                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 222                   if (PREDICT_FALSE (p0 == NULL))
 223                     {
 224                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 225                       next0 = GENEVE_INPUT_NEXT_DROP;
 226                       goto trace0;
 227                     }
 228                   last_key4.as_u64 = key4_0.as_u64;
 229                   tunnel_index0 = last_tunnel_index = p0[0];
 230                 }
 231               else
 232                 tunnel_index0 = last_tunnel_index;
 233               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 234
 235               /* Validate GENEVE tunnel encap-fib index against packet */
 236               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 237                 {
 238                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 239                   next0 = GENEVE_INPUT_NEXT_DROP;
 240                   goto trace0;
 241                 }
 242
 243               /* Validate GENEVE tunnel SIP against packet DIP */
 244               if (PREDICT_TRUE
 245                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 246                 goto next0;     /* valid packet */
 247               if (PREDICT_FALSE
 248                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 249                 {
 250                   key4_0.remote = ip4_0->dst_address.as_u32;
 251                   key4_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 252                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 253                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 254                   if (PREDICT_TRUE (p0 != NULL))
 255                     {
 256                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 257                       goto next0;       /* valid packet */
 258                     }
 259                 }
 260               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 261               next0 = GENEVE_INPUT_NEXT_DROP;
 262               goto trace0;
 263
 264             }
 265           else                  /* !is_ip4 */
 266             {
 267               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 268               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 269               key6_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 270
 271               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 272               if (PREDICT_FALSE
 273                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 274                 {
 275                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 276                   if (PREDICT_FALSE (p0 == NULL))
 277                     {
 278                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 279                       next0 = GENEVE_INPUT_NEXT_DROP;
 280                       goto trace0;
 281                     }
 282                   clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0));
 283                   tunnel_index0 = last_tunnel_index = p0[0];
 284                 }
 285               else
 286                 tunnel_index0 = last_tunnel_index;
 287               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 288
 289               /* Validate GENEVE tunnel encap-fib index against packet */
 290               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 291                 {
 292                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 293                   next0 = GENEVE_INPUT_NEXT_DROP;
 294                   goto trace0;
 295                 }
 296
 297               /* Validate GENEVE tunnel SIP against packet DIP */
 298               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 299                                                       &t0->local.ip6)))
 300                 goto next0;     /* valid packet */
 301               if (PREDICT_FALSE
 302                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 303                 {
 304                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 305                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 306                   key6_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 307                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 308                   if (PREDICT_TRUE (p0 != NULL))
 309                     {
 310                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 311                       goto next0;       /* valid packet */
 312                     }
 313                 }
 314               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 315               next0 = GENEVE_INPUT_NEXT_DROP;
 316               goto trace0;
 317             }
 318
 319         next0:
 320           next0 = t0->decap_next_index;
 321           sw_if_index0 = t0->sw_if_index;
 322           len0 = vlib_buffer_length_in_chain (vm, b0);
 323
 324           /* Required to make the l2 tag push / pop code work on l2 subifs */
 325           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 326             vnet_update_l2_len (b0);
 327
 328           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 329           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 330           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 331
 332           pkts_decapsulated++;
 333           stats_n_packets += 1;
 334           stats_n_bytes += len0;
 335
 336           /* Batch stats increment on the same geneve tunnel so counter
 337              is not incremented per packet */
 338           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 339             {
 340               stats_n_packets -= 1;
 341               stats_n_bytes -= len0;
 342               if (stats_n_packets)
 343                 vlib_increment_combined_counter
 344                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 345                    thread_index, stats_sw_if_index,
 346                    stats_n_packets, stats_n_bytes);
 347               stats_n_packets = 1;
 348               stats_n_bytes = len0;
 349               stats_sw_if_index = sw_if_index0;
 350             }
 351
 352         trace0:
 353           b0->error = error0 ? node->errors[error0] : 0;
 354
 355           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 356             {
 357               geneve_rx_trace_t *tr
 358                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 359               tr->next_index = next0;
 360               tr->error = error0;
 361               tr->tunnel_index = tunnel_index0;
 362               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 363             }
 364
 365           if (PREDICT_FALSE
 366               (vnet_get_geneve_version (geneve1) != GENEVE_VERSION))
 367             {
 368               error1 = GENEVE_ERROR_BAD_FLAGS;
 369               next1 = GENEVE_INPUT_NEXT_DROP;
 370               goto trace1;
 371             }
 372 #if SUPPORT_OPTIONS_HEADER==1
 373           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve1) == 1))
 374             {
 375               error1 = GENEVE_ERROR_BAD_FLAGS;
 376               next1 = GENEVE_INPUT_NEXT_DROP;
 377               goto trace1;
 378             }
 379 #endif
 380           if (is_ip4)
 381             {
 382               key4_1.remote = ip4_1->src_address.as_u32;
 383               key4_1.vni = vnet_get_geneve_vni_network_order (geneve1);
 384
 385               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 386               if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
 387                 {
 388                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 389                   if (PREDICT_FALSE (p1 == NULL))
 390                     {
 391                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 392                       next1 = GENEVE_INPUT_NEXT_DROP;
 393                       goto trace1;
 394                     }
 395                   last_key4.as_u64 = key4_1.as_u64;
 396                   tunnel_index1 = last_tunnel_index = p1[0];
 397                 }
 398               else
 399                 tunnel_index1 = last_tunnel_index;
 400               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 401
 402               /* Validate GENEVE tunnel encap-fib index against packet */
 403               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 404                 {
 405                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 406                   next1 = GENEVE_INPUT_NEXT_DROP;
 407                   goto trace1;
 408                 }
 409
 410               /* Validate GENEVE tunnel SIP against packet DIP */
 411               if (PREDICT_TRUE
 412                   (ip4_1->dst_address.as_u32 == t1->local.ip4.as_u32))
 413                 goto next1;     /* valid packet */
 414               if (PREDICT_FALSE
 415                   (ip4_address_is_multicast (&ip4_1->dst_address)))
 416                 {
 417                   key4_1.remote = ip4_1->dst_address.as_u32;
 418                   key4_1.vni = vnet_get_geneve_vni_network_order (geneve1);
 419                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 420                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 421                   if (PREDICT_TRUE (p1 != NULL))
 422                     {
 423                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 424                       goto next1;       /* valid packet */
 425                     }
 426                 }
 427               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 428               next1 = GENEVE_INPUT_NEXT_DROP;
 429               goto trace1;
 430
 431             }
 432           else                  /* !is_ip4 */
 433             {
 434               key6_1.remote.as_u64[0] = ip6_1->src_address.as_u64[0];
 435               key6_1.remote.as_u64[1] = ip6_1->src_address.as_u64[1];
 436               key6_1.vni = vnet_get_geneve_vni_network_order (geneve1);
 437
 438               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 439               if (PREDICT_FALSE
 440                   (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
 441                 {
 442                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 443
 444                   if (PREDICT_FALSE (p1 == NULL))
 445                     {
 446                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 447                       next1 = GENEVE_INPUT_NEXT_DROP;
 448                       goto trace1;
 449                     }
 450
 451                   clib_memcpy_fast (&last_key6, &key6_1, sizeof (key6_1));
 452                   tunnel_index1 = last_tunnel_index = p1[0];
 453                 }
 454               else
 455                 tunnel_index1 = last_tunnel_index;
 456               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 457
 458               /* Validate GENEVE tunnel encap-fib index against packet */
 459               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 460                 {
 461                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 462                   next1 = GENEVE_INPUT_NEXT_DROP;
 463                   goto trace1;
 464                 }
 465
 466               /* Validate GENEVE tunnel SIP against packet DIP */
 467               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
 468                                                       &t1->local.ip6)))
 469                 goto next1;     /* valid packet */
 470               if (PREDICT_FALSE
 471                   (ip6_address_is_multicast (&ip6_1->dst_address)))
 472                 {
 473                   key6_1.remote.as_u64[0] = ip6_1->dst_address.as_u64[0];
 474                   key6_1.remote.as_u64[1] = ip6_1->dst_address.as_u64[1];
 475                   key6_1.vni = vnet_get_geneve_vni_network_order (geneve1);
 476                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 477                   if (PREDICT_TRUE (p1 != NULL))
 478                     {
 479                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 480                       goto next1;       /* valid packet */
 481                     }
 482                 }
 483               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 484               next1 = GENEVE_INPUT_NEXT_DROP;
 485               goto trace1;
 486             }
 487
 488         next1:
 489           next1 = t1->decap_next_index;
 490           sw_if_index1 = t1->sw_if_index;
 491           len1 = vlib_buffer_length_in_chain (vm, b1);
 492
 493           /* Required to make the l2 tag push / pop code work on l2 subifs */
 494           if (PREDICT_TRUE (next1 == GENEVE_INPUT_NEXT_L2_INPUT))
 495             vnet_update_l2_len (b1);
 496
 497           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 498           vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;
 499           sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
 500
 501           pkts_decapsulated++;
 502           stats_n_packets += 1;
 503           stats_n_bytes += len1;
 504
 505           /* Batch stats increment on the same geneve tunnel so counter
 506              is not incremented per packet */
 507           if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
 508             {
 509               stats_n_packets -= 1;
 510               stats_n_bytes -= len1;
 511               if (stats_n_packets)
 512                 vlib_increment_combined_counter
 513                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 514                    thread_index, stats_sw_if_index,
 515                    stats_n_packets, stats_n_bytes);
 516               stats_n_packets = 1;
 517               stats_n_bytes = len1;
 518               stats_sw_if_index = sw_if_index1;
 519             }
 520
 521         trace1:
 522           b1->error = error1 ? node->errors[error1] : 0;
 523
 524           if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 525             {
 526               geneve_rx_trace_t *tr
 527                 = vlib_add_trace (vm, node, b1, sizeof (*tr));
 528               tr->next_index = next1;
 529               tr->error = error1;
 530               tr->tunnel_index = tunnel_index1;
 531               tr->vni_rsvd = vnet_get_geneve_vni (geneve1);
 532             }
 533
 534           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 535                                            to_next, n_left_to_next,
 536                                            bi0, bi1, next0, next1);
 537         }
 538
 539       while (n_left_from > 0 && n_left_to_next > 0)
 540         {
 541           u32 bi0;
 542           vlib_buffer_t *b0;
 543           u32 next0;
 544           ip4_header_t *ip4_0;
 545           ip6_header_t *ip6_0;
 546           geneve_header_t *geneve0;
 547           uword *p0;
 548           u32 tunnel_index0;
 549           geneve_tunnel_t *t0, *mt0 = NULL;
 550           geneve4_tunnel_key_t key4_0;
 551           geneve6_tunnel_key_t key6_0;
 552           u32 error0;
 553           u32 sw_if_index0, len0;
 554
 555           bi0 = from[0];
 556           to_next[0] = bi0;
 557           from += 1;
 558           to_next += 1;
 559           n_left_from -= 1;
 560           n_left_to_next -= 1;
 561
 562           b0 = b[0];
 563           b += 1;
 564
 565           /* udp leaves current_data pointing at the geneve header */
 566           geneve0 = vlib_buffer_get_current (b0);
 567           vnet_geneve_hdr_1word_ntoh (geneve0);
 568
 569           if (is_ip4)
 570             {
 571               vlib_buffer_advance
 572                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 573               ip4_0 = vlib_buffer_get_current (b0);
 574             }
 575           else
 576             {
 577               vlib_buffer_advance
 578                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 579               ip6_0 = vlib_buffer_get_current (b0);
 580             }
 581
 582           /* pop (ip, udp, geneve) */
 583           if (is_ip4)
 584             {
 585               vlib_buffer_advance
 586                 (b0,
 587                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 588                  GENEVE_BASE_HEADER_LENGTH +
 589                  vnet_get_geneve_options_len (geneve0));
 590             }
 591           else
 592             {
 593               vlib_buffer_advance
 594                 (b0,
 595                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 596                  GENEVE_BASE_HEADER_LENGTH +
 597                  vnet_get_geneve_options_len (geneve0));
 598             }
 599
 600           tunnel_index0 = ~0;
 601           error0 = 0;
 602
 603           if (PREDICT_FALSE
 604               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 605             {
 606               error0 = GENEVE_ERROR_BAD_FLAGS;
 607               next0 = GENEVE_INPUT_NEXT_DROP;
 608               goto trace00;
 609             }
 610 #if SUPPORT_OPTIONS_HEADER==1
 611           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 612             {
 613               error0 = GENEVE_ERROR_BAD_FLAGS;
 614               next0 = GENEVE_INPUT_NEXT_DROP;
 615               goto trace00;
 616             }
 617 #endif
 618           if (is_ip4)
 619             {
 620               key4_0.remote = ip4_0->src_address.as_u32;
 621               key4_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 622
 623               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 624               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 625                 {
 626                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 627                   if (PREDICT_FALSE (p0 == NULL))
 628                     {
 629                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 630                       next0 = GENEVE_INPUT_NEXT_DROP;
 631                       goto trace00;
 632                     }
 633                   last_key4.as_u64 = key4_0.as_u64;
 634                   tunnel_index0 = last_tunnel_index = p0[0];
 635                 }
 636               else
 637                 tunnel_index0 = last_tunnel_index;
 638               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 639
 640               /* Validate GENEVE tunnel encap-fib index agaist packet */
 641               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 642                 {
 643                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 644                   next0 = GENEVE_INPUT_NEXT_DROP;
 645                   goto trace00;
 646                 }
 647
 648               /* Validate GENEVE tunnel SIP against packet DIP */
 649               if (PREDICT_TRUE
 650                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 651                 goto next00;    /* valid packet */
 652               if (PREDICT_FALSE
 653                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 654                 {
 655                   key4_0.remote = ip4_0->dst_address.as_u32;
 656                   key4_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 657                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 658                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 659                   if (PREDICT_TRUE (p0 != NULL))
 660                     {
 661                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 662                       goto next00;      /* valid packet */
 663                     }
 664                 }
 665               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 666               next0 = GENEVE_INPUT_NEXT_DROP;
 667               goto trace00;
 668
 669             }
 670           else                  /* !is_ip4 */
 671             {
 672               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 673               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 674               key6_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 675
 676               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 677               if (PREDICT_FALSE
 678                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 679                 {
 680                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 681                   if (PREDICT_FALSE (p0 == NULL))
 682                     {
 683                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 684                       next0 = GENEVE_INPUT_NEXT_DROP;
 685                       goto trace00;
 686                     }
 687                   clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0));
 688                   tunnel_index0 = last_tunnel_index = p0[0];
 689                 }
 690               else
 691                 tunnel_index0 = last_tunnel_index;
 692               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 693
 694               /* Validate GENEVE tunnel encap-fib index agaist packet */
 695               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 696                 {
 697                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 698                   next0 = GENEVE_INPUT_NEXT_DROP;
 699                   goto trace00;
 700                 }
 701
 702               /* Validate GENEVE tunnel SIP against packet DIP */
 703               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 704                                                       &t0->local.ip6)))
 705                 goto next00;    /* valid packet */
 706               if (PREDICT_FALSE
 707                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 708                 {
 709                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 710                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 711                   key6_0.vni = vnet_get_geneve_vni_network_order (geneve0);
 712                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 713                   if (PREDICT_TRUE (p0 != NULL))
 714                     {
 715                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 716                       goto next00;      /* valid packet */
 717                     }
 718                 }
 719               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 720               next0 = GENEVE_INPUT_NEXT_DROP;
 721               goto trace00;
 722             }
 723
 724         next00:
 725           next0 = t0->decap_next_index;
 726           sw_if_index0 = t0->sw_if_index;
 727           len0 = vlib_buffer_length_in_chain (vm, b0);
 728
 729           /* Required to make the l2 tag push / pop code work on l2 subifs */
 730           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 731             vnet_update_l2_len (b0);
 732
 733           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 734           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 735           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 736
 737           pkts_decapsulated++;
 738           stats_n_packets += 1;
 739           stats_n_bytes += len0;
 740
 741           /* Batch stats increment on the same geneve tunnel so counter
 742              is not incremented per packet */
 743           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 744             {
 745               stats_n_packets -= 1;
 746               stats_n_bytes -= len0;
 747               if (stats_n_packets)
 748                 vlib_increment_combined_counter
 749                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 750                    thread_index, stats_sw_if_index,
 751                    stats_n_packets, stats_n_bytes);
 752               stats_n_packets = 1;
 753               stats_n_bytes = len0;
 754               stats_sw_if_index = sw_if_index0;
 755             }
 756
 757         trace00:
 758           b0->error = error0 ? node->errors[error0] : 0;
 759
 760           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 761             {
 762               geneve_rx_trace_t *tr
 763                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 764               tr->next_index = next0;
 765               tr->error = error0;
 766               tr->tunnel_index = tunnel_index0;
 767               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 768             }
 769           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 770                                            to_next, n_left_to_next,
 771                                            bi0, next0);
 772         }
 773
 774       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 775     }
 776   /* Do we still need this now that tunnel tx stats is kept? */
 777   vlib_node_increment_counter (vm, is_ip4 ?
 778                                geneve4_input_node.
 779                                index : geneve6_input_node.index,
 780                                GENEVE_ERROR_DECAPSULATED, pkts_decapsulated);
 781
 782   /* Increment any remaining batch stats */
 783   if (stats_n_packets)
 784     {
 785       vlib_increment_combined_counter
 786         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 787          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 788       node->runtime_data[0] = stats_sw_if_index;
 789     }
 790
 791   return from_frame->n_vectors;
 792 }
 793
 794 VLIB_NODE_FN (geneve4_input_node) (vlib_main_t * vm,
 795                                    vlib_node_runtime_t * node,
 796                                    vlib_frame_t * from_frame)
 797 {
 798   return geneve_input (vm, node, from_frame, /* is_ip4 */ 1);
 799 }
 800
 801 VLIB_NODE_FN (geneve6_input_node) (vlib_main_t * vm,
 802                                    vlib_node_runtime_t * node,
 803                                    vlib_frame_t * from_frame)
 804 {
 805   return geneve_input (vm, node, from_frame, /* is_ip4 */ 0);
 806 }
 807
 808 static char *geneve_error_strings[] = {
 809 #define geneve_error(n,s) s,
 810 #include <vnet/geneve/geneve_error.def>
 811 #undef geneve_error
 812 #undef _
 813 };
 814
 815 /* *INDENT-OFF* */
 816 VLIB_REGISTER_NODE (geneve4_input_node) = {
 817   .name = "geneve4-input",
 818   /* Takes a vector of packets. */
 819   .vector_size = sizeof (u32),
 820   .n_errors = GENEVE_N_ERROR,
 821   .error_strings = geneve_error_strings,
 822   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 823   .next_nodes = {
 824 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 825     foreach_geneve_input_next
 826 #undef _
 827   },
 828
 829 //temp  .format_buffer = format_geneve_header,
 830   .format_trace = format_geneve_rx_trace,
 831   // $$$$ .unformat_buffer = unformat_geneve_header,
 832 };
 833
 834 VLIB_REGISTER_NODE (geneve6_input_node) = {
 835   .name = "geneve6-input",
 836   /* Takes a vector of packets. */
 837   .vector_size = sizeof (u32),
 838   .n_errors = GENEVE_N_ERROR,
 839   .error_strings = geneve_error_strings,
 840   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 841   .next_nodes = {
 842 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 843   foreach_geneve_input_next
 844 #undef _
 845   },
 846 //temp  .format_buffer = format_geneve_header,
 847   .format_trace = format_geneve_rx_trace,
 848   // $$$$ .unformat_buffer = unformat_geneve_header,
 849 };
 850 /* *INDENT-ON* */
 851
 852 typedef enum
 853 {
 854   IP_GENEVE_BYPASS_NEXT_DROP,
 855   IP_GENEVE_BYPASS_NEXT_GENEVE,
 856   IP_GENEVE_BYPASS_N_NEXT,
 857 } ip_vxan_bypass_next_t;
 858
 859 always_inline uword
 860 ip_geneve_bypass_inline (vlib_main_t * vm,
 861                          vlib_node_runtime_t * node,
 862                          vlib_frame_t * frame, u32 is_ip4)
 863 {
 864   geneve_main_t *vxm = &geneve_main;
 865   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
 866   vlib_node_runtime_t *error_node =
 867     vlib_node_get_runtime (vm, ip4_input_node.index);
 868   vtep4_key_t last_vtep4;       /* last IPv4 address / fib index
 869                                    matching a local VTEP address */
 870   vtep6_key_t last_vtep6;       /* last IPv6 address / fib index
 871                                    matching a local VTEP address */
 872
 873   from = vlib_frame_vector_args (frame);
 874   n_left_from = frame->n_vectors;
 875   next_index = node->cached_next_index;
 876
 877   if (node->flags & VLIB_NODE_FLAG_TRACE)
 878     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 879
 880   if (is_ip4)
 881     vtep4_key_init (&last_vtep4);
 882   else
 883     vtep6_key_init (&last_vtep6);
 884
 885   while (n_left_from > 0)
 886     {
 887       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 888
 889       while (n_left_from >= 4 && n_left_to_next >= 2)
 890         {
 891           vlib_buffer_t *b0, *b1;
 892           ip4_header_t *ip40, *ip41;
 893           ip6_header_t *ip60, *ip61;
 894           udp_header_t *udp0, *udp1;
 895           u32 bi0, ip_len0, udp_len0, flags0, next0;
 896           u32 bi1, ip_len1, udp_len1, flags1, next1;
 897           i32 len_diff0, len_diff1;
 898           u8 error0, good_udp0, proto0;
 899           u8 error1, good_udp1, proto1;
 900
 901           /* Prefetch next iteration. */
 902           {
 903             vlib_buffer_t *p2, *p3;
 904
 905             p2 = vlib_get_buffer (vm, from[2]);
 906             p3 = vlib_get_buffer (vm, from[3]);
 907
 908             vlib_prefetch_buffer_header (p2, LOAD);
 909             vlib_prefetch_buffer_header (p3, LOAD);
 910
 911             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 912             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 913           }
 914
 915           bi0 = to_next[0] = from[0];
 916           bi1 = to_next[1] = from[1];
 917           from += 2;
 918           n_left_from -= 2;
 919           to_next += 2;
 920           n_left_to_next -= 2;
 921
 922           b0 = vlib_get_buffer (vm, bi0);
 923           b1 = vlib_get_buffer (vm, bi1);
 924           if (is_ip4)
 925             {
 926               ip40 = vlib_buffer_get_current (b0);
 927               ip41 = vlib_buffer_get_current (b1);
 928             }
 929           else
 930             {
 931               ip60 = vlib_buffer_get_current (b0);
 932               ip61 = vlib_buffer_get_current (b1);
 933             }
 934
 935           /* Setup packet for next IP feature */
 936           vnet_feature_next (&next0, b0);
 937           vnet_feature_next (&next1, b1);
 938
 939           if (is_ip4)
 940             {
 941               /* Treat IP frag packets as "experimental" protocol for now
 942                  until support of IP frag reassembly is implemented */
 943               proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
 944               proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
 945             }
 946           else
 947             {
 948               proto0 = ip60->protocol;
 949               proto1 = ip61->protocol;
 950             }
 951
 952           /* Process packet 0 */
 953           if (proto0 != IP_PROTOCOL_UDP)
 954             goto exit0;         /* not UDP packet */
 955
 956           if (is_ip4)
 957             udp0 = ip4_next_header (ip40);
 958           else
 959             udp0 = ip6_next_header (ip60);
 960
 961           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
 962             goto exit0;         /* not GENEVE packet */
 963
 964           /* Validate DIP against VTEPs */
 965           if (is_ip4)
 966             {
 967               if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
 968                 goto exit0;     /* no local VTEP for GENEVE packet */
 969             }
 970           else
 971             {
 972               if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
 973                 goto exit0;     /* no local VTEP for GENEVE packet */
 974             }
 975
 976           flags0 = b0->flags;
 977           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
 978
 979           /* Don't verify UDP checksum for packets with explicit zero checksum. */
 980           good_udp0 |= udp0->checksum == 0;
 981
 982           /* Verify UDP length */
 983           if (is_ip4)
 984             ip_len0 = clib_net_to_host_u16 (ip40->length);
 985           else
 986             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
 987           udp_len0 = clib_net_to_host_u16 (udp0->length);
 988           len_diff0 = ip_len0 - udp_len0;
 989
 990           /* Verify UDP checksum */
 991           if (PREDICT_FALSE (!good_udp0))
 992             {
 993               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
 994                 {
 995                   if (is_ip4)
 996                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
 997                   else
 998                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
 999                   good_udp0 =
1000                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1001                 }
1002             }
1003
1004           if (is_ip4)
1005             {
1006               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1007               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1008             }
1009           else
1010             {
1011               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1012               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1013             }
1014
1015           next0 = error0 ?
1016             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1017           b0->error = error0 ? error_node->errors[error0] : 0;
1018
1019           /* geneve-input node expect current at GENEVE header */
1020           if (is_ip4)
1021             vlib_buffer_advance (b0,
1022                                  sizeof (ip4_header_t) +
1023                                  sizeof (udp_header_t));
1024           else
1025             vlib_buffer_advance (b0,
1026                                  sizeof (ip6_header_t) +
1027                                  sizeof (udp_header_t));
1028
1029         exit0:
1030           /* Process packet 1 */
1031           if (proto1 != IP_PROTOCOL_UDP)
1032             goto exit1;         /* not UDP packet */
1033
1034           if (is_ip4)
1035             udp1 = ip4_next_header (ip41);
1036           else
1037             udp1 = ip6_next_header (ip61);
1038
1039           if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1040             goto exit1;         /* not GENEVE packet */
1041
1042           /* Validate DIP against VTEPs */
1043           if (is_ip4)
1044             {
1045               if (!vtep4_check (&vxm->vtep_table, b1, ip41, &last_vtep4))
1046                 goto exit1;     /* no local VTEP for GENEVE packet */
1047             }
1048           else
1049             {
1050               if (!vtep6_check (&vxm->vtep_table, b1, ip61, &last_vtep6))
1051                 goto exit1;     /* no local VTEP for GENEVE packet */
1052             }
1053
1054           flags1 = b1->flags;
1055           good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1056
1057           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1058           good_udp1 |= udp1->checksum == 0;
1059
1060           /* Verify UDP length */
1061           if (is_ip4)
1062             ip_len1 = clib_net_to_host_u16 (ip41->length);
1063           else
1064             ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
1065           udp_len1 = clib_net_to_host_u16 (udp1->length);
1066           len_diff1 = ip_len1 - udp_len1;
1067
1068           /* Verify UDP checksum */
1069           if (PREDICT_FALSE (!good_udp1))
1070             {
1071               if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1072                 {
1073                   if (is_ip4)
1074                     flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
1075                   else
1076                     flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
1077                   good_udp1 =
1078                     (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1079                 }
1080             }
1081
1082           if (is_ip4)
1083             {
1084               error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1085               error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
1086             }
1087           else
1088             {
1089               error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1090               error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
1091             }
1092
1093           next1 = error1 ?
1094             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1095           b1->error = error1 ? error_node->errors[error1] : 0;
1096
1097           /* geneve-input node expect current at GENEVE header */
1098           if (is_ip4)
1099             vlib_buffer_advance (b1,
1100                                  sizeof (ip4_header_t) +
1101                                  sizeof (udp_header_t));
1102           else
1103             vlib_buffer_advance (b1,
1104                                  sizeof (ip6_header_t) +
1105                                  sizeof (udp_header_t));
1106
1107         exit1:
1108           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1109                                            to_next, n_left_to_next,
1110                                            bi0, bi1, next0, next1);
1111         }
1112
1113       while (n_left_from > 0 && n_left_to_next > 0)
1114         {
1115           vlib_buffer_t *b0;
1116           ip4_header_t *ip40;
1117           ip6_header_t *ip60;
1118           udp_header_t *udp0;
1119           u32 bi0, ip_len0, udp_len0, flags0, next0;
1120           i32 len_diff0;
1121           u8 error0, good_udp0, proto0;
1122
1123           bi0 = to_next[0] = from[0];
1124           from += 1;
1125           n_left_from -= 1;
1126           to_next += 1;
1127           n_left_to_next -= 1;
1128
1129           b0 = vlib_get_buffer (vm, bi0);
1130           if (is_ip4)
1131             ip40 = vlib_buffer_get_current (b0);
1132           else
1133             ip60 = vlib_buffer_get_current (b0);
1134
1135           /* Setup packet for next IP feature */
1136           vnet_feature_next (&next0, b0);
1137
1138           if (is_ip4)
1139             /* Treat IP4 frag packets as "experimental" protocol for now
1140                until support of IP frag reassembly is implemented */
1141             proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
1142           else
1143             proto0 = ip60->protocol;
1144
1145           if (proto0 != IP_PROTOCOL_UDP)
1146             goto exit;          /* not UDP packet */
1147
1148           if (is_ip4)
1149             udp0 = ip4_next_header (ip40);
1150           else
1151             udp0 = ip6_next_header (ip60);
1152
1153           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1154             goto exit;          /* not GENEVE packet */
1155
1156           /* Validate DIP against VTEPs */
1157           if (is_ip4)
1158             {
1159               if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
1160                 goto exit;      /* no local VTEP for GENEVE packet */
1161             }
1162           else
1163             {
1164               if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
1165                 goto exit;      /* no local VTEP for GENEVE packet */
1166             }
1167
1168           flags0 = b0->flags;
1169           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1170
1171           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1172           good_udp0 |= udp0->checksum == 0;
1173
1174           /* Verify UDP length */
1175           if (is_ip4)
1176             ip_len0 = clib_net_to_host_u16 (ip40->length);
1177           else
1178             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
1179           udp_len0 = clib_net_to_host_u16 (udp0->length);
1180           len_diff0 = ip_len0 - udp_len0;
1181
1182           /* Verify UDP checksum */
1183           if (PREDICT_FALSE (!good_udp0))
1184             {
1185               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1186                 {
1187                   if (is_ip4)
1188                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1189                   else
1190                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1191                   good_udp0 =
1192                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1193                 }
1194             }
1195
1196           if (is_ip4)
1197             {
1198               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1199               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1200             }
1201           else
1202             {
1203               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1204               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1205             }
1206
1207           next0 = error0 ?
1208             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1209           b0->error = error0 ? error_node->errors[error0] : 0;
1210
1211           /* geneve-input node expect current at GENEVE header */
1212           if (is_ip4)
1213             vlib_buffer_advance (b0,
1214                                  sizeof (ip4_header_t) +
1215                                  sizeof (udp_header_t));
1216           else
1217             vlib_buffer_advance (b0,
1218                                  sizeof (ip6_header_t) +
1219                                  sizeof (udp_header_t));
1220
1221         exit:
1222           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1223                                            to_next, n_left_to_next,
1224                                            bi0, next0);
1225         }
1226
1227       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1228     }
1229
1230   return frame->n_vectors;
1231 }
1232
1233 VLIB_NODE_FN (ip4_geneve_bypass_node) (vlib_main_t * vm,
1234                                        vlib_node_runtime_t * node,
1235                                        vlib_frame_t * frame)
1236 {
1237   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
1238 }
1239
1240 /* *INDENT-OFF* */
1241 VLIB_REGISTER_NODE (ip4_geneve_bypass_node) =
1242 {
1243   .name = "ip4-geneve-bypass",
1244   .vector_size = sizeof (u32),
1245   .n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1246   {
1247     [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1248     [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve4-input",
1249   },
1250   .format_buffer = format_ip4_header,
1251   .format_trace = format_ip4_forward_next_trace,
1252 };
1253 /* *INDENT-ON* */
1254
1255 VLIB_NODE_FN (ip6_geneve_bypass_node) (vlib_main_t * vm,
1256                                        vlib_node_runtime_t * node,
1257                                        vlib_frame_t * frame)
1258 {
1259   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
1260 }
1261
1262 /* *INDENT-OFF* */
1263 VLIB_REGISTER_NODE (ip6_geneve_bypass_node) =
1264 {
1265   .name = "ip6-geneve-bypass",
1266   .vector_size = sizeof (u32),
1267   .n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,
1268   .next_nodes =
1269   {
1270     [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1271     [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve6-input",
1272   },
1273   .format_buffer = format_ip6_header,
1274   .format_trace = format_ip6_forward_next_trace,
1275 };
1276 /* *INDENT-ON* */
1277
1278 /*
1279  * fd.io coding-style-patch-verification: ON
1280  *
1281  * Local Variables:
1282  * eval: (c-set-style "gnu")
1283  * End:
1284  */