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_rsvd;
  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_rsvd, 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_rsvd);
  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 = vm->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
 151           vnet_geneve_hdr_1word_ntoh (geneve0);
 152           vnet_geneve_hdr_1word_ntoh (geneve1);
 153
 154           if (is_ip4)
 155             {
 156               vlib_buffer_advance
 157                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 158               vlib_buffer_advance
 159                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 160               ip4_0 = vlib_buffer_get_current (b0);
 161               ip4_1 = vlib_buffer_get_current (b1);
 162             }
 163           else
 164             {
 165               vlib_buffer_advance
 166                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 167               vlib_buffer_advance
 168                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 169               ip6_0 = vlib_buffer_get_current (b0);
 170               ip6_1 = vlib_buffer_get_current (b1);
 171             }
 172
 173           /* pop (ip, udp, geneve) */
 174           if (is_ip4)
 175             {
 176               vlib_buffer_advance
 177                 (b0,
 178                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 179                  GENEVE_BASE_HEADER_LENGTH +
 180                  vnet_get_geneve_options_len (geneve0));
 181               vlib_buffer_advance (b1,
 182                                    sizeof (*ip4_1) + sizeof (udp_header_t) +
 183                                    GENEVE_BASE_HEADER_LENGTH +
 184                                    vnet_get_geneve_options_len (geneve1));
 185             }
 186           else
 187             {
 188               vlib_buffer_advance
 189                 (b0,
 190                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 191                  GENEVE_BASE_HEADER_LENGTH +
 192                  vnet_get_geneve_options_len (geneve0));
 193               vlib_buffer_advance (b0,
 194                                    sizeof (*ip6_0) + sizeof (udp_header_t) +
 195                                    GENEVE_BASE_HEADER_LENGTH +
 196                                    vnet_get_geneve_options_len (geneve1));
 197             }
 198
 199           tunnel_index0 = ~0;
 200           error0 = 0;
 201
 202           tunnel_index1 = ~0;
 203           error1 = 0;
 204
 205           if (PREDICT_FALSE
 206               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 207             {
 208               error0 = GENEVE_ERROR_BAD_FLAGS;
 209               next0 = GENEVE_INPUT_NEXT_DROP;
 210               goto trace0;
 211             }
 212 #if SUPPORT_OPTIONS_HEADER==1
 213           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 214             {
 215               error0 = GENEVE_ERROR_BAD_FLAGS;
 216               next0 = GENEVE_INPUT_NEXT_DROP;
 217               goto trace0;
 218             }
 219 #endif
 220           if (is_ip4)
 221             {
 222               key4_0.remote = ip4_0->src_address.as_u32;
 223               key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 224
 225               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 226               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 227                 {
 228                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 229                   if (PREDICT_FALSE (p0 == NULL))
 230                     {
 231                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 232                       next0 = GENEVE_INPUT_NEXT_DROP;
 233                       goto trace0;
 234                     }
 235                   last_key4.as_u64 = key4_0.as_u64;
 236                   tunnel_index0 = last_tunnel_index = p0[0];
 237                 }
 238               else
 239                 tunnel_index0 = last_tunnel_index;
 240               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 241
 242               /* Validate GENEVE tunnel encap-fib index agaist packet */
 243               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 244                 {
 245                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 246                   next0 = GENEVE_INPUT_NEXT_DROP;
 247                   goto trace0;
 248                 }
 249
 250               /* Validate GENEVE tunnel SIP against packet DIP */
 251               if (PREDICT_TRUE
 252                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 253                 goto next0;     /* valid packet */
 254               if (PREDICT_FALSE
 255                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 256                 {
 257                   key4_0.remote = ip4_0->dst_address.as_u32;
 258                   key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 259                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 260                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 261                   if (PREDICT_TRUE (p0 != NULL))
 262                     {
 263                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 264                       goto next0;       /* valid packet */
 265                     }
 266                 }
 267               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 268               next0 = GENEVE_INPUT_NEXT_DROP;
 269               goto trace0;
 270
 271             }
 272           else                  /* !is_ip4 */
 273             {
 274               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 275               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 276               key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 277
 278               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 279               if (PREDICT_FALSE
 280                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 281                 {
 282                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 283                   if (PREDICT_FALSE (p0 == NULL))
 284                     {
 285                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 286                       next0 = GENEVE_INPUT_NEXT_DROP;
 287                       goto trace0;
 288                     }
 289                   clib_memcpy (&last_key6, &key6_0, sizeof (key6_0));
 290                   tunnel_index0 = last_tunnel_index = p0[0];
 291                 }
 292               else
 293                 tunnel_index0 = last_tunnel_index;
 294               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 295
 296               /* Validate GENEVE tunnel encap-fib index agaist packet */
 297               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 298                 {
 299                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 300                   next0 = GENEVE_INPUT_NEXT_DROP;
 301                   goto trace0;
 302                 }
 303
 304               /* Validate GENEVE tunnel SIP against packet DIP */
 305               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 306                                                       &t0->local.ip6)))
 307                 goto next0;     /* valid packet */
 308               if (PREDICT_FALSE
 309                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 310                 {
 311                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 312                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 313                   key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 314                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 315                   if (PREDICT_TRUE (p0 != NULL))
 316                     {
 317                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 318                       goto next0;       /* valid packet */
 319                     }
 320                 }
 321               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 322               next0 = GENEVE_INPUT_NEXT_DROP;
 323               goto trace0;
 324             }
 325
 326         next0:
 327           next0 = t0->decap_next_index;
 328           sw_if_index0 = t0->sw_if_index;
 329           len0 = vlib_buffer_length_in_chain (vm, b0);
 330
 331           /* Required to make the l2 tag push / pop code work on l2 subifs */
 332           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 333             vnet_update_l2_len (b0);
 334
 335           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 336           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 337           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 338
 339           pkts_decapsulated++;
 340           stats_n_packets += 1;
 341           stats_n_bytes += len0;
 342
 343           /* Batch stats increment on the same geneve tunnel so counter
 344              is not incremented per packet */
 345           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 346             {
 347               stats_n_packets -= 1;
 348               stats_n_bytes -= len0;
 349               if (stats_n_packets)
 350                 vlib_increment_combined_counter
 351                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 352                    thread_index, stats_sw_if_index,
 353                    stats_n_packets, stats_n_bytes);
 354               stats_n_packets = 1;
 355               stats_n_bytes = len0;
 356               stats_sw_if_index = sw_if_index0;
 357             }
 358
 359         trace0:
 360           b0->error = error0 ? node->errors[error0] : 0;
 361
 362           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 363             {
 364               geneve_rx_trace_t *tr
 365                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 366               tr->next_index = next0;
 367               tr->error = error0;
 368               tr->tunnel_index = tunnel_index0;
 369               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 370             }
 371
 372           if (PREDICT_FALSE
 373               (vnet_get_geneve_version (geneve1) != GENEVE_VERSION))
 374             {
 375               error1 = GENEVE_ERROR_BAD_FLAGS;
 376               next1 = GENEVE_INPUT_NEXT_DROP;
 377               goto trace1;
 378             }
 379 #if SUPPORT_OPTIONS_HEADER==1
 380           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve1) == 1))
 381             {
 382               error1 = GENEVE_ERROR_BAD_FLAGS;
 383               next1 = GENEVE_INPUT_NEXT_DROP;
 384               goto trace1;
 385             }
 386 #endif
 387           if (is_ip4)
 388             {
 389               key4_1.remote = ip4_1->src_address.as_u32;
 390               key4_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 391
 392               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 393               if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
 394                 {
 395                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 396                   if (PREDICT_FALSE (p1 == NULL))
 397                     {
 398                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 399                       next1 = GENEVE_INPUT_NEXT_DROP;
 400                       goto trace1;
 401                     }
 402                   last_key4.as_u64 = key4_1.as_u64;
 403                   tunnel_index1 = last_tunnel_index = p1[0];
 404                 }
 405               else
 406                 tunnel_index1 = last_tunnel_index;
 407               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 408
 409               /* Validate GENEVE tunnel encap-fib index agaist packet */
 410               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 411                 {
 412                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 413                   next1 = GENEVE_INPUT_NEXT_DROP;
 414                   goto trace1;
 415                 }
 416
 417               /* Validate GENEVE tunnel SIP against packet DIP */
 418               if (PREDICT_TRUE
 419                   (ip4_1->dst_address.as_u32 == t1->local.ip4.as_u32))
 420                 goto next1;     /* valid packet */
 421               if (PREDICT_FALSE
 422                   (ip4_address_is_multicast (&ip4_1->dst_address)))
 423                 {
 424                   key4_1.remote = ip4_1->dst_address.as_u32;
 425                   key4_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 426                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 427                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 428                   if (PREDICT_TRUE (p1 != NULL))
 429                     {
 430                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 431                       goto next1;       /* valid packet */
 432                     }
 433                 }
 434               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 435               next1 = GENEVE_INPUT_NEXT_DROP;
 436               goto trace1;
 437
 438             }
 439           else                  /* !is_ip4 */
 440             {
 441               key6_1.remote.as_u64[0] = ip6_1->src_address.as_u64[0];
 442               key6_1.remote.as_u64[1] = ip6_1->src_address.as_u64[1];
 443               key6_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 444
 445               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 446               if (PREDICT_FALSE
 447                   (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
 448                 {
 449                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 450
 451                   if (PREDICT_FALSE (p1 == NULL))
 452                     {
 453                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 454                       next1 = GENEVE_INPUT_NEXT_DROP;
 455                       goto trace1;
 456                     }
 457
 458                   clib_memcpy (&last_key6, &key6_1, sizeof (key6_1));
 459                   tunnel_index1 = last_tunnel_index = p1[0];
 460                 }
 461               else
 462                 tunnel_index1 = last_tunnel_index;
 463               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 464
 465               /* Validate GENEVE tunnel encap-fib index agaist packet */
 466               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 467                 {
 468                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 469                   next1 = GENEVE_INPUT_NEXT_DROP;
 470                   goto trace1;
 471                 }
 472
 473               /* Validate GENEVE tunnel SIP against packet DIP */
 474               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
 475                                                       &t1->local.ip6)))
 476                 goto next1;     /* valid packet */
 477               if (PREDICT_FALSE
 478                   (ip6_address_is_multicast (&ip6_1->dst_address)))
 479                 {
 480                   key6_1.remote.as_u64[0] = ip6_1->dst_address.as_u64[0];
 481                   key6_1.remote.as_u64[1] = ip6_1->dst_address.as_u64[1];
 482                   key6_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 483                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 484                   if (PREDICT_TRUE (p1 != NULL))
 485                     {
 486                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 487                       goto next1;       /* valid packet */
 488                     }
 489                 }
 490               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 491               next1 = GENEVE_INPUT_NEXT_DROP;
 492               goto trace1;
 493             }
 494
 495         next1:
 496           next1 = t1->decap_next_index;
 497           sw_if_index1 = t1->sw_if_index;
 498           len1 = vlib_buffer_length_in_chain (vm, b1);
 499
 500           /* Required to make the l2 tag push / pop code work on l2 subifs */
 501           if (PREDICT_TRUE (next1 == GENEVE_INPUT_NEXT_L2_INPUT))
 502             vnet_update_l2_len (b1);
 503
 504           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 505           vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;
 506           sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
 507
 508           pkts_decapsulated++;
 509           stats_n_packets += 1;
 510           stats_n_bytes += len1;
 511
 512           /* Batch stats increment on the same geneve tunnel so counter
 513              is not incremented per packet */
 514           if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
 515             {
 516               stats_n_packets -= 1;
 517               stats_n_bytes -= len1;
 518               if (stats_n_packets)
 519                 vlib_increment_combined_counter
 520                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 521                    thread_index, stats_sw_if_index,
 522                    stats_n_packets, stats_n_bytes);
 523               stats_n_packets = 1;
 524               stats_n_bytes = len1;
 525               stats_sw_if_index = sw_if_index1;
 526             }
 527
 528         trace1:
 529           b1->error = error1 ? node->errors[error1] : 0;
 530
 531           if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 532             {
 533               geneve_rx_trace_t *tr
 534                 = vlib_add_trace (vm, node, b1, sizeof (*tr));
 535               tr->next_index = next1;
 536               tr->error = error1;
 537               tr->tunnel_index = tunnel_index1;
 538               tr->vni_rsvd = vnet_get_geneve_vni (geneve1);
 539             }
 540
 541           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 542                                            to_next, n_left_to_next,
 543                                            bi0, bi1, next0, next1);
 544         }
 545
 546       while (n_left_from > 0 && n_left_to_next > 0)
 547         {
 548           u32 bi0;
 549           vlib_buffer_t *b0;
 550           u32 next0;
 551           ip4_header_t *ip4_0;
 552           ip6_header_t *ip6_0;
 553           geneve_header_t *geneve0;
 554           uword *p0;
 555           u32 tunnel_index0;
 556           geneve_tunnel_t *t0, *mt0 = NULL;
 557           geneve4_tunnel_key_t key4_0;
 558           geneve6_tunnel_key_t key6_0;
 559           u32 error0;
 560           u32 sw_if_index0, len0;
 561
 562           bi0 = from[0];
 563           to_next[0] = bi0;
 564           from += 1;
 565           to_next += 1;
 566           n_left_from -= 1;
 567           n_left_to_next -= 1;
 568
 569           b0 = vlib_get_buffer (vm, bi0);
 570
 571           /* udp leaves current_data pointing at the geneve header */
 572           geneve0 = vlib_buffer_get_current (b0);
 573           vnet_geneve_hdr_1word_ntoh (geneve0);
 574
 575           if (is_ip4)
 576             {
 577               vlib_buffer_advance
 578                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 579               ip4_0 = vlib_buffer_get_current (b0);
 580             }
 581           else
 582             {
 583               vlib_buffer_advance
 584                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 585               ip6_0 = vlib_buffer_get_current (b0);
 586             }
 587
 588           /* pop (ip, udp, geneve) */
 589           if (is_ip4)
 590             {
 591               vlib_buffer_advance
 592                 (b0,
 593                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 594                  GENEVE_BASE_HEADER_LENGTH +
 595                  vnet_get_geneve_options_len (geneve0));
 596             }
 597           else
 598             {
 599               vlib_buffer_advance
 600                 (b0,
 601                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 602                  GENEVE_BASE_HEADER_LENGTH +
 603                  vnet_get_geneve_options_len (geneve0));
 604             }
 605
 606           tunnel_index0 = ~0;
 607           error0 = 0;
 608
 609           if (PREDICT_FALSE
 610               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 611             {
 612               error0 = GENEVE_ERROR_BAD_FLAGS;
 613               next0 = GENEVE_INPUT_NEXT_DROP;
 614               goto trace00;
 615             }
 616 #if SUPPORT_OPTIONS_HEADER==1
 617           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 618             {
 619               error0 = GENEVE_ERROR_BAD_FLAGS;
 620               next0 = GENEVE_INPUT_NEXT_DROP;
 621               goto trace00;
 622             }
 623 #endif
 624           if (is_ip4)
 625             {
 626               key4_0.remote = ip4_0->src_address.as_u32;
 627               key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 628
 629               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 630               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 631                 {
 632                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 633                   if (PREDICT_FALSE (p0 == NULL))
 634                     {
 635                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 636                       next0 = GENEVE_INPUT_NEXT_DROP;
 637                       goto trace00;
 638                     }
 639                   last_key4.as_u64 = key4_0.as_u64;
 640                   tunnel_index0 = last_tunnel_index = p0[0];
 641                 }
 642               else
 643                 tunnel_index0 = last_tunnel_index;
 644               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 645
 646               /* Validate GENEVE tunnel encap-fib index agaist packet */
 647               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 648                 {
 649                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 650                   next0 = GENEVE_INPUT_NEXT_DROP;
 651                   goto trace00;
 652                 }
 653
 654               /* Validate GENEVE tunnel SIP against packet DIP */
 655               if (PREDICT_TRUE
 656                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 657                 goto next00;    /* valid packet */
 658               if (PREDICT_FALSE
 659                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 660                 {
 661                   key4_0.remote = ip4_0->dst_address.as_u32;
 662                   key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 663                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 664                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 665                   if (PREDICT_TRUE (p0 != NULL))
 666                     {
 667                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 668                       goto next00;      /* valid packet */
 669                     }
 670                 }
 671               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 672               next0 = GENEVE_INPUT_NEXT_DROP;
 673               goto trace00;
 674
 675             }
 676           else                  /* !is_ip4 */
 677             {
 678               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 679               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 680               key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 681
 682               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 683               if (PREDICT_FALSE
 684                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 685                 {
 686                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 687                   if (PREDICT_FALSE (p0 == NULL))
 688                     {
 689                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 690                       next0 = GENEVE_INPUT_NEXT_DROP;
 691                       goto trace00;
 692                     }
 693                   clib_memcpy (&last_key6, &key6_0, sizeof (key6_0));
 694                   tunnel_index0 = last_tunnel_index = p0[0];
 695                 }
 696               else
 697                 tunnel_index0 = last_tunnel_index;
 698               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 699
 700               /* Validate GENEVE tunnel encap-fib index agaist packet */
 701               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 702                 {
 703                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 704                   next0 = GENEVE_INPUT_NEXT_DROP;
 705                   goto trace00;
 706                 }
 707
 708               /* Validate GENEVE tunnel SIP against packet DIP */
 709               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 710                                                       &t0->local.ip6)))
 711                 goto next00;    /* valid packet */
 712               if (PREDICT_FALSE
 713                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 714                 {
 715                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 716                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 717                   key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 718                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 719                   if (PREDICT_TRUE (p0 != NULL))
 720                     {
 721                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 722                       goto next00;      /* valid packet */
 723                     }
 724                 }
 725               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 726               next0 = GENEVE_INPUT_NEXT_DROP;
 727               goto trace00;
 728             }
 729
 730         next00:
 731           next0 = t0->decap_next_index;
 732           sw_if_index0 = t0->sw_if_index;
 733           len0 = vlib_buffer_length_in_chain (vm, b0);
 734
 735           /* Required to make the l2 tag push / pop code work on l2 subifs */
 736           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 737             vnet_update_l2_len (b0);
 738
 739           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 740           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 741           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 742
 743           pkts_decapsulated++;
 744           stats_n_packets += 1;
 745           stats_n_bytes += len0;
 746
 747           /* Batch stats increment on the same geneve tunnel so counter
 748              is not incremented per packet */
 749           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 750             {
 751               stats_n_packets -= 1;
 752               stats_n_bytes -= len0;
 753               if (stats_n_packets)
 754                 vlib_increment_combined_counter
 755                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 756                    thread_index, stats_sw_if_index,
 757                    stats_n_packets, stats_n_bytes);
 758               stats_n_packets = 1;
 759               stats_n_bytes = len0;
 760               stats_sw_if_index = sw_if_index0;
 761             }
 762
 763         trace00:
 764           b0->error = error0 ? node->errors[error0] : 0;
 765
 766           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 767             {
 768               geneve_rx_trace_t *tr
 769                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 770               tr->next_index = next0;
 771               tr->error = error0;
 772               tr->tunnel_index = tunnel_index0;
 773               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 774             }
 775           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 776                                            to_next, n_left_to_next,
 777                                            bi0, next0);
 778         }
 779
 780       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 781     }
 782   /* Do we still need this now that tunnel tx stats is kept? */
 783   vlib_node_increment_counter (vm, is_ip4 ?
 784                                geneve4_input_node.
 785                                index : geneve6_input_node.index,
 786                                GENEVE_ERROR_DECAPSULATED, pkts_decapsulated);
 787
 788   /* Increment any remaining batch stats */
 789   if (stats_n_packets)
 790     {
 791       vlib_increment_combined_counter
 792         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 793          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 794       node->runtime_data[0] = stats_sw_if_index;
 795     }
 796
 797   return from_frame->n_vectors;
 798 }
 799
 800 static uword
 801 geneve4_input (vlib_main_t * vm,
 802                vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 803 {
 804   return geneve_input (vm, node, from_frame, /* is_ip4 */ 1);
 805 }
 806
 807 static uword
 808 geneve6_input (vlib_main_t * vm,
 809                vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 810 {
 811   return geneve_input (vm, node, from_frame, /* is_ip4 */ 0);
 812 }
 813
 814 static char *geneve_error_strings[] = {
 815 #define geneve_error(n,s) s,
 816 #include <vnet/geneve/geneve_error.def>
 817 #undef geneve_error
 818 #undef _
 819 };
 820
 821 /* *INDENT-OFF* */
 822 VLIB_REGISTER_NODE (geneve4_input_node) = {
 823   .function = geneve4_input,
 824   .name = "geneve4-input",
 825   /* Takes a vector of packets. */
 826   .vector_size = sizeof (u32),
 827   .n_errors = GENEVE_N_ERROR,
 828   .error_strings = geneve_error_strings,
 829   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 830   .next_nodes = {
 831 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 832     foreach_geneve_input_next
 833 #undef _
 834   },
 835
 836 //temp  .format_buffer = format_geneve_header,
 837   .format_trace = format_geneve_rx_trace,
 838   // $$$$ .unformat_buffer = unformat_geneve_header,
 839 };
 840
 841 VLIB_NODE_FUNCTION_MULTIARCH (geneve4_input_node, geneve4_input)
 842
 843 VLIB_REGISTER_NODE (geneve6_input_node) = {
 844   .function = geneve6_input,
 845   .name = "geneve6-input",
 846   /* Takes a vector of packets. */
 847   .vector_size = sizeof (u32),
 848   .n_errors = GENEVE_N_ERROR,
 849   .error_strings = geneve_error_strings,
 850   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 851   .next_nodes = {
 852 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 853   foreach_geneve_input_next
 854 #undef _
 855   },
 856 //temp  .format_buffer = format_geneve_header,
 857   .format_trace = format_geneve_rx_trace,
 858   // $$$$ .unformat_buffer = unformat_geneve_header,
 859 };
 860
 861 VLIB_NODE_FUNCTION_MULTIARCH (geneve6_input_node, geneve6_input)
 862 /* *INDENT-ON* */
 863
 864 typedef enum
 865 {
 866   IP_GENEVE_BYPASS_NEXT_DROP,
 867   IP_GENEVE_BYPASS_NEXT_GENEVE,
 868   IP_GENEVE_BYPASS_N_NEXT,
 869 } ip_vxan_bypass_next_t;
 870
 871 always_inline uword
 872 ip_geneve_bypass_inline (vlib_main_t * vm,
 873                          vlib_node_runtime_t * node,
 874                          vlib_frame_t * frame, u32 is_ip4)
 875 {
 876   geneve_main_t *vxm = &geneve_main;
 877   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
 878   vlib_node_runtime_t *error_node =
 879     vlib_node_get_runtime (vm, ip4_input_node.index);
 880   ip4_address_t addr4;          /* last IPv4 address matching a local VTEP address */
 881   ip6_address_t addr6;          /* last IPv6 address matching a local VTEP address */
 882
 883   from = vlib_frame_vector_args (frame);
 884   n_left_from = frame->n_vectors;
 885   next_index = node->cached_next_index;
 886
 887   if (node->flags & VLIB_NODE_FLAG_TRACE)
 888     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 889
 890   if (is_ip4)
 891     addr4.data_u32 = ~0;
 892   else
 893     ip6_address_set_zero (&addr6);
 894
 895   while (n_left_from > 0)
 896     {
 897       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 898
 899       while (n_left_from >= 4 && n_left_to_next >= 2)
 900         {
 901           vlib_buffer_t *b0, *b1;
 902           ip4_header_t *ip40, *ip41;
 903           ip6_header_t *ip60, *ip61;
 904           udp_header_t *udp0, *udp1;
 905           u32 bi0, ip_len0, udp_len0, flags0, next0;
 906           u32 bi1, ip_len1, udp_len1, flags1, next1;
 907           i32 len_diff0, len_diff1;
 908           u8 error0, good_udp0, proto0;
 909           u8 error1, good_udp1, proto1;
 910
 911           /* Prefetch next iteration. */
 912           {
 913             vlib_buffer_t *p2, *p3;
 914
 915             p2 = vlib_get_buffer (vm, from[2]);
 916             p3 = vlib_get_buffer (vm, from[3]);
 917
 918             vlib_prefetch_buffer_header (p2, LOAD);
 919             vlib_prefetch_buffer_header (p3, LOAD);
 920
 921             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 922             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 923           }
 924
 925           bi0 = to_next[0] = from[0];
 926           bi1 = to_next[1] = from[1];
 927           from += 2;
 928           n_left_from -= 2;
 929           to_next += 2;
 930           n_left_to_next -= 2;
 931
 932           b0 = vlib_get_buffer (vm, bi0);
 933           b1 = vlib_get_buffer (vm, bi1);
 934           if (is_ip4)
 935             {
 936               ip40 = vlib_buffer_get_current (b0);
 937               ip41 = vlib_buffer_get_current (b1);
 938             }
 939           else
 940             {
 941               ip60 = vlib_buffer_get_current (b0);
 942               ip61 = vlib_buffer_get_current (b1);
 943             }
 944
 945           /* Setup packet for next IP feature */
 946           vnet_feature_next (&next0, b0);
 947           vnet_feature_next (&next1, b1);
 948
 949           if (is_ip4)
 950             {
 951               /* Treat IP frag packets as "experimental" protocol for now
 952                  until support of IP frag reassembly is implemented */
 953               proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
 954               proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
 955             }
 956           else
 957             {
 958               proto0 = ip60->protocol;
 959               proto1 = ip61->protocol;
 960             }
 961
 962           /* Process packet 0 */
 963           if (proto0 != IP_PROTOCOL_UDP)
 964             goto exit0;         /* not UDP packet */
 965
 966           if (is_ip4)
 967             udp0 = ip4_next_header (ip40);
 968           else
 969             udp0 = ip6_next_header (ip60);
 970
 971           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
 972             goto exit0;         /* not GENEVE packet */
 973
 974           /* Validate DIP against VTEPs */
 975           if (is_ip4)
 976             {
 977               if (addr4.as_u32 != ip40->dst_address.as_u32)
 978                 {
 979                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
 980                     goto exit0; /* no local VTEP for GENEVE packet */
 981                   addr4 = ip40->dst_address;
 982                 }
 983             }
 984           else
 985             {
 986               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
 987                 {
 988                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
 989                     goto exit0; /* no local VTEP for GENEVE packet */
 990                   addr6 = ip60->dst_address;
 991                 }
 992             }
 993
 994           flags0 = b0->flags;
 995           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
 996
 997           /* Don't verify UDP checksum for packets with explicit zero checksum. */
 998           good_udp0 |= udp0->checksum == 0;
 999
1000           /* Verify UDP length */
1001           if (is_ip4)
1002             ip_len0 = clib_net_to_host_u16 (ip40->length);
1003           else
1004             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
1005           udp_len0 = clib_net_to_host_u16 (udp0->length);
1006           len_diff0 = ip_len0 - udp_len0;
1007
1008           /* Verify UDP checksum */
1009           if (PREDICT_FALSE (!good_udp0))
1010             {
1011               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1012                 {
1013                   if (is_ip4)
1014                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1015                   else
1016                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1017                   good_udp0 =
1018                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1019                 }
1020             }
1021
1022           if (is_ip4)
1023             {
1024               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1025               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1026             }
1027           else
1028             {
1029               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1030               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1031             }
1032
1033           next0 = error0 ?
1034             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1035           b0->error = error0 ? error_node->errors[error0] : 0;
1036
1037           /* geneve-input node expect current at GENEVE header */
1038           if (is_ip4)
1039             vlib_buffer_advance (b0,
1040                                  sizeof (ip4_header_t) +
1041                                  sizeof (udp_header_t));
1042           else
1043             vlib_buffer_advance (b0,
1044                                  sizeof (ip6_header_t) +
1045                                  sizeof (udp_header_t));
1046
1047         exit0:
1048           /* Process packet 1 */
1049           if (proto1 != IP_PROTOCOL_UDP)
1050             goto exit1;         /* not UDP packet */
1051
1052           if (is_ip4)
1053             udp1 = ip4_next_header (ip41);
1054           else
1055             udp1 = ip6_next_header (ip61);
1056
1057           if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1058             goto exit1;         /* not GENEVE packet */
1059
1060           /* Validate DIP against VTEPs */
1061           if (is_ip4)
1062             {
1063               if (addr4.as_u32 != ip41->dst_address.as_u32)
1064                 {
1065                   if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
1066                     goto exit1; /* no local VTEP for GENEVE packet */
1067                   addr4 = ip41->dst_address;
1068                 }
1069             }
1070           else
1071             {
1072               if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
1073                 {
1074                   if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
1075                     goto exit1; /* no local VTEP for GENEVE packet */
1076                   addr6 = ip61->dst_address;
1077                 }
1078             }
1079
1080           flags1 = b1->flags;
1081           good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1082
1083           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1084           good_udp1 |= udp1->checksum == 0;
1085
1086           /* Verify UDP length */
1087           if (is_ip4)
1088             ip_len1 = clib_net_to_host_u16 (ip41->length);
1089           else
1090             ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
1091           udp_len1 = clib_net_to_host_u16 (udp1->length);
1092           len_diff1 = ip_len1 - udp_len1;
1093
1094           /* Verify UDP checksum */
1095           if (PREDICT_FALSE (!good_udp1))
1096             {
1097               if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1098                 {
1099                   if (is_ip4)
1100                     flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
1101                   else
1102                     flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
1103                   good_udp1 =
1104                     (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1105                 }
1106             }
1107
1108           if (is_ip4)
1109             {
1110               error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1111               error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
1112             }
1113           else
1114             {
1115               error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1116               error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
1117             }
1118
1119           next1 = error1 ?
1120             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1121           b1->error = error1 ? error_node->errors[error1] : 0;
1122
1123           /* geneve-input node expect current at GENEVE header */
1124           if (is_ip4)
1125             vlib_buffer_advance (b1,
1126                                  sizeof (ip4_header_t) +
1127                                  sizeof (udp_header_t));
1128           else
1129             vlib_buffer_advance (b1,
1130                                  sizeof (ip6_header_t) +
1131                                  sizeof (udp_header_t));
1132
1133         exit1:
1134           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1135                                            to_next, n_left_to_next,
1136                                            bi0, bi1, next0, next1);
1137         }
1138
1139       while (n_left_from > 0 && n_left_to_next > 0)
1140         {
1141           vlib_buffer_t *b0;
1142           ip4_header_t *ip40;
1143           ip6_header_t *ip60;
1144           udp_header_t *udp0;
1145           u32 bi0, ip_len0, udp_len0, flags0, next0;
1146           i32 len_diff0;
1147           u8 error0, good_udp0, proto0;
1148
1149           bi0 = to_next[0] = from[0];
1150           from += 1;
1151           n_left_from -= 1;
1152           to_next += 1;
1153           n_left_to_next -= 1;
1154
1155           b0 = vlib_get_buffer (vm, bi0);
1156           if (is_ip4)
1157             ip40 = vlib_buffer_get_current (b0);
1158           else
1159             ip60 = vlib_buffer_get_current (b0);
1160
1161           /* Setup packet for next IP feature */
1162           vnet_feature_next (&next0, b0);
1163
1164           if (is_ip4)
1165             /* Treat IP4 frag packets as "experimental" protocol for now
1166                until support of IP frag reassembly is implemented */
1167             proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
1168           else
1169             proto0 = ip60->protocol;
1170
1171           if (proto0 != IP_PROTOCOL_UDP)
1172             goto exit;          /* not UDP packet */
1173
1174           if (is_ip4)
1175             udp0 = ip4_next_header (ip40);
1176           else
1177             udp0 = ip6_next_header (ip60);
1178
1179           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1180             goto exit;          /* not GENEVE packet */
1181
1182           /* Validate DIP against VTEPs */
1183           if (is_ip4)
1184             {
1185               if (addr4.as_u32 != ip40->dst_address.as_u32)
1186                 {
1187                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
1188                     goto exit;  /* no local VTEP for GENEVE packet */
1189                   addr4 = ip40->dst_address;
1190                 }
1191             }
1192           else
1193             {
1194               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
1195                 {
1196                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
1197                     goto exit;  /* no local VTEP for GENEVE packet */
1198                   addr6 = ip60->dst_address;
1199                 }
1200             }
1201
1202           flags0 = b0->flags;
1203           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1204
1205           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1206           good_udp0 |= udp0->checksum == 0;
1207
1208           /* Verify UDP length */
1209           if (is_ip4)
1210             ip_len0 = clib_net_to_host_u16 (ip40->length);
1211           else
1212             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
1213           udp_len0 = clib_net_to_host_u16 (udp0->length);
1214           len_diff0 = ip_len0 - udp_len0;
1215
1216           /* Verify UDP checksum */
1217           if (PREDICT_FALSE (!good_udp0))
1218             {
1219               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1220                 {
1221                   if (is_ip4)
1222                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1223                   else
1224                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1225                   good_udp0 =
1226                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1227                 }
1228             }
1229
1230           if (is_ip4)
1231             {
1232               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1233               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1234             }
1235           else
1236             {
1237               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1238               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1239             }
1240
1241           next0 = error0 ?
1242             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1243           b0->error = error0 ? error_node->errors[error0] : 0;
1244
1245           /* geneve-input node expect current at GENEVE header */
1246           if (is_ip4)
1247             vlib_buffer_advance (b0,
1248                                  sizeof (ip4_header_t) +
1249                                  sizeof (udp_header_t));
1250           else
1251             vlib_buffer_advance (b0,
1252                                  sizeof (ip6_header_t) +
1253                                  sizeof (udp_header_t));
1254
1255         exit:
1256           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1257                                            to_next, n_left_to_next,
1258                                            bi0, next0);
1259         }
1260
1261       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1262     }
1263
1264   return frame->n_vectors;
1265 }
1266
1267 static uword
1268 ip4_geneve_bypass (vlib_main_t * vm,
1269                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1270 {
1271   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
1272 }
1273
1274 /* *INDENT-OFF* */
1275 VLIB_REGISTER_NODE (ip4_geneve_bypass_node) =
1276 {
1277   .function = ip4_geneve_bypass,.name = "ip4-geneve-bypass",.vector_size =
1278     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1279   {
1280   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1281       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve4-input",}
1282 ,.format_buffer = format_ip4_header,.format_trace =
1283     format_ip4_forward_next_trace,};
1284
1285 VLIB_NODE_FUNCTION_MULTIARCH (ip4_geneve_bypass_node, ip4_geneve_bypass)
1286 /* Dummy init function to get us linked in. */
1287      clib_error_t *ip4_geneve_bypass_init (vlib_main_t * vm)
1288 {
1289   return 0;
1290 }
1291
1292 VLIB_INIT_FUNCTION (ip4_geneve_bypass_init);
1293 /* *INDENT-ON* */
1294
1295 static uword
1296 ip6_geneve_bypass (vlib_main_t * vm,
1297                    vlib_node_runtime_t * node, vlib_frame_t * frame)
1298 {
1299   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
1300 }
1301
1302 /* *INDENT-OFF* */
1303 VLIB_REGISTER_NODE (ip6_geneve_bypass_node) =
1304 {
1305   .function = ip6_geneve_bypass,.name = "ip6-geneve-bypass",.vector_size =
1306     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1307   {
1308   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1309       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve6-input",}
1310 ,.format_buffer = format_ip6_header,.format_trace =
1311     format_ip6_forward_next_trace,};
1312 /* *INDENT-ON* */
1313
1314 VLIB_NODE_FUNCTION_MULTIARCH (ip6_geneve_bypass_node, ip6_geneve_bypass)
1315 /* Dummy init function to get us linked in. */
1316      clib_error_t *ip6_geneve_bypass_init (vlib_main_t * vm)
1317 {
1318   return 0;
1319 }
1320
1321 VLIB_INIT_FUNCTION (ip6_geneve_bypass_init);
1322
1323 /*
1324  * fd.io coding-style-patch-verification: ON
1325  *
1326  * Local Variables:
1327  * eval: (c-set-style "gnu")
1328  * End:
1329  */