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