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
  85   if (is_ip4)
  86     last_key4.as_u64 = ~0;
  87   else
  88     clib_memset (&last_key6, 0xff, sizeof (last_key6));
  89
  90   from = vlib_frame_vector_args (from_frame);
  91   n_left_from = from_frame->n_vectors;
  92
  93   next_index = node->cached_next_index;
  94   stats_sw_if_index = node->runtime_data[0];
  95   stats_n_packets = stats_n_bytes = 0;
  96
  97   while (n_left_from > 0)
  98     {
  99       u32 n_left_to_next;
 100
 101       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 102       while (n_left_from >= 4 && n_left_to_next >= 2)
 103         {
 104           u32 bi0, bi1;
 105           vlib_buffer_t *b0, *b1;
 106           u32 next0, next1;
 107           ip4_header_t *ip4_0, *ip4_1;
 108           ip6_header_t *ip6_0, *ip6_1;
 109           geneve_header_t *geneve0, *geneve1;
 110           uword *p0, *p1;
 111           u32 tunnel_index0, tunnel_index1;
 112           geneve_tunnel_t *t0, *t1, *mt0 = NULL, *mt1 = NULL;
 113           geneve4_tunnel_key_t key4_0, key4_1;
 114           geneve6_tunnel_key_t key6_0, key6_1;
 115           u32 error0, error1;
 116           u32 sw_if_index0, sw_if_index1, len0, len1;
 117
 118           /* Prefetch next iteration. */
 119           {
 120             vlib_buffer_t *p2, *p3;
 121
 122             p2 = vlib_get_buffer (vm, from[2]);
 123             p3 = vlib_get_buffer (vm, from[3]);
 124
 125             vlib_prefetch_buffer_header (p2, LOAD);
 126             vlib_prefetch_buffer_header (p3, LOAD);
 127
 128             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 129             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 130           }
 131
 132           bi0 = from[0];
 133           bi1 = from[1];
 134           to_next[0] = bi0;
 135           to_next[1] = bi1;
 136           from += 2;
 137           to_next += 2;
 138           n_left_to_next -= 2;
 139           n_left_from -= 2;
 140
 141           b0 = vlib_get_buffer (vm, bi0);
 142           b1 = vlib_get_buffer (vm, bi1);
 143
 144           /* udp leaves current_data pointing at the geneve header */
 145           geneve0 = vlib_buffer_get_current (b0);
 146           geneve1 = vlib_buffer_get_current (b1);
 147
 148           vnet_geneve_hdr_1word_ntoh (geneve0);
 149           vnet_geneve_hdr_1word_ntoh (geneve1);
 150
 151           if (is_ip4)
 152             {
 153               vlib_buffer_advance
 154                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 155               vlib_buffer_advance
 156                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 157               ip4_0 = vlib_buffer_get_current (b0);
 158               ip4_1 = vlib_buffer_get_current (b1);
 159             }
 160           else
 161             {
 162               vlib_buffer_advance
 163                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 164               vlib_buffer_advance
 165                 (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 166               ip6_0 = vlib_buffer_get_current (b0);
 167               ip6_1 = vlib_buffer_get_current (b1);
 168             }
 169
 170           /* pop (ip, udp, geneve) */
 171           if (is_ip4)
 172             {
 173               vlib_buffer_advance
 174                 (b0,
 175                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 176                  GENEVE_BASE_HEADER_LENGTH +
 177                  vnet_get_geneve_options_len (geneve0));
 178               vlib_buffer_advance (b1,
 179                                    sizeof (*ip4_1) + sizeof (udp_header_t) +
 180                                    GENEVE_BASE_HEADER_LENGTH +
 181                                    vnet_get_geneve_options_len (geneve1));
 182             }
 183           else
 184             {
 185               vlib_buffer_advance
 186                 (b0,
 187                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 188                  GENEVE_BASE_HEADER_LENGTH +
 189                  vnet_get_geneve_options_len (geneve0));
 190               vlib_buffer_advance (b0,
 191                                    sizeof (*ip6_0) + sizeof (udp_header_t) +
 192                                    GENEVE_BASE_HEADER_LENGTH +
 193                                    vnet_get_geneve_options_len (geneve1));
 194             }
 195
 196           tunnel_index0 = ~0;
 197           error0 = 0;
 198
 199           tunnel_index1 = ~0;
 200           error1 = 0;
 201
 202           if (PREDICT_FALSE
 203               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 204             {
 205               error0 = GENEVE_ERROR_BAD_FLAGS;
 206               next0 = GENEVE_INPUT_NEXT_DROP;
 207               goto trace0;
 208             }
 209 #if SUPPORT_OPTIONS_HEADER==1
 210           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 211             {
 212               error0 = GENEVE_ERROR_BAD_FLAGS;
 213               next0 = GENEVE_INPUT_NEXT_DROP;
 214               goto trace0;
 215             }
 216 #endif
 217           if (is_ip4)
 218             {
 219               key4_0.remote = ip4_0->src_address.as_u32;
 220               key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 221
 222               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 223               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 224                 {
 225                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 226                   if (PREDICT_FALSE (p0 == NULL))
 227                     {
 228                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 229                       next0 = GENEVE_INPUT_NEXT_DROP;
 230                       goto trace0;
 231                     }
 232                   last_key4.as_u64 = key4_0.as_u64;
 233                   tunnel_index0 = last_tunnel_index = p0[0];
 234                 }
 235               else
 236                 tunnel_index0 = last_tunnel_index;
 237               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 238
 239               /* Validate GENEVE tunnel encap-fib index against packet */
 240               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 241                 {
 242                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 243                   next0 = GENEVE_INPUT_NEXT_DROP;
 244                   goto trace0;
 245                 }
 246
 247               /* Validate GENEVE tunnel SIP against packet DIP */
 248               if (PREDICT_TRUE
 249                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 250                 goto next0;     /* valid packet */
 251               if (PREDICT_FALSE
 252                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 253                 {
 254                   key4_0.remote = ip4_0->dst_address.as_u32;
 255                   key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 256                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 257                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 258                   if (PREDICT_TRUE (p0 != NULL))
 259                     {
 260                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 261                       goto next0;       /* valid packet */
 262                     }
 263                 }
 264               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 265               next0 = GENEVE_INPUT_NEXT_DROP;
 266               goto trace0;
 267
 268             }
 269           else                  /* !is_ip4 */
 270             {
 271               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 272               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 273               key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 274
 275               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 276               if (PREDICT_FALSE
 277                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 278                 {
 279                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 280                   if (PREDICT_FALSE (p0 == NULL))
 281                     {
 282                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 283                       next0 = GENEVE_INPUT_NEXT_DROP;
 284                       goto trace0;
 285                     }
 286                   clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0));
 287                   tunnel_index0 = last_tunnel_index = p0[0];
 288                 }
 289               else
 290                 tunnel_index0 = last_tunnel_index;
 291               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 292
 293               /* Validate GENEVE tunnel encap-fib index against packet */
 294               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 295                 {
 296                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 297                   next0 = GENEVE_INPUT_NEXT_DROP;
 298                   goto trace0;
 299                 }
 300
 301               /* Validate GENEVE tunnel SIP against packet DIP */
 302               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 303                                                       &t0->local.ip6)))
 304                 goto next0;     /* valid packet */
 305               if (PREDICT_FALSE
 306                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 307                 {
 308                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 309                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 310                   key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 311                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 312                   if (PREDICT_TRUE (p0 != NULL))
 313                     {
 314                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 315                       goto next0;       /* valid packet */
 316                     }
 317                 }
 318               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 319               next0 = GENEVE_INPUT_NEXT_DROP;
 320               goto trace0;
 321             }
 322
 323         next0:
 324           next0 = t0->decap_next_index;
 325           sw_if_index0 = t0->sw_if_index;
 326           len0 = vlib_buffer_length_in_chain (vm, b0);
 327
 328           /* Required to make the l2 tag push / pop code work on l2 subifs */
 329           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 330             vnet_update_l2_len (b0);
 331
 332           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 333           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 334           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 335
 336           pkts_decapsulated++;
 337           stats_n_packets += 1;
 338           stats_n_bytes += len0;
 339
 340           /* Batch stats increment on the same geneve tunnel so counter
 341              is not incremented per packet */
 342           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 343             {
 344               stats_n_packets -= 1;
 345               stats_n_bytes -= len0;
 346               if (stats_n_packets)
 347                 vlib_increment_combined_counter
 348                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 349                    thread_index, stats_sw_if_index,
 350                    stats_n_packets, stats_n_bytes);
 351               stats_n_packets = 1;
 352               stats_n_bytes = len0;
 353               stats_sw_if_index = sw_if_index0;
 354             }
 355
 356         trace0:
 357           b0->error = error0 ? node->errors[error0] : 0;
 358
 359           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 360             {
 361               geneve_rx_trace_t *tr
 362                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 363               tr->next_index = next0;
 364               tr->error = error0;
 365               tr->tunnel_index = tunnel_index0;
 366               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 367             }
 368
 369           if (PREDICT_FALSE
 370               (vnet_get_geneve_version (geneve1) != GENEVE_VERSION))
 371             {
 372               error1 = GENEVE_ERROR_BAD_FLAGS;
 373               next1 = GENEVE_INPUT_NEXT_DROP;
 374               goto trace1;
 375             }
 376 #if SUPPORT_OPTIONS_HEADER==1
 377           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve1) == 1))
 378             {
 379               error1 = GENEVE_ERROR_BAD_FLAGS;
 380               next1 = GENEVE_INPUT_NEXT_DROP;
 381               goto trace1;
 382             }
 383 #endif
 384           if (is_ip4)
 385             {
 386               key4_1.remote = ip4_1->src_address.as_u32;
 387               key4_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 388
 389               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 390               if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
 391                 {
 392                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 393                   if (PREDICT_FALSE (p1 == NULL))
 394                     {
 395                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 396                       next1 = GENEVE_INPUT_NEXT_DROP;
 397                       goto trace1;
 398                     }
 399                   last_key4.as_u64 = key4_1.as_u64;
 400                   tunnel_index1 = last_tunnel_index = p1[0];
 401                 }
 402               else
 403                 tunnel_index1 = last_tunnel_index;
 404               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 405
 406               /* Validate GENEVE tunnel encap-fib index against packet */
 407               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 408                 {
 409                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 410                   next1 = GENEVE_INPUT_NEXT_DROP;
 411                   goto trace1;
 412                 }
 413
 414               /* Validate GENEVE tunnel SIP against packet DIP */
 415               if (PREDICT_TRUE
 416                   (ip4_1->dst_address.as_u32 == t1->local.ip4.as_u32))
 417                 goto next1;     /* valid packet */
 418               if (PREDICT_FALSE
 419                   (ip4_address_is_multicast (&ip4_1->dst_address)))
 420                 {
 421                   key4_1.remote = ip4_1->dst_address.as_u32;
 422                   key4_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 423                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 424                   p1 = hash_get (vxm->geneve4_tunnel_by_key, key4_1.as_u64);
 425                   if (PREDICT_TRUE (p1 != NULL))
 426                     {
 427                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 428                       goto next1;       /* valid packet */
 429                     }
 430                 }
 431               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 432               next1 = GENEVE_INPUT_NEXT_DROP;
 433               goto trace1;
 434
 435             }
 436           else                  /* !is_ip4 */
 437             {
 438               key6_1.remote.as_u64[0] = ip6_1->src_address.as_u64[0];
 439               key6_1.remote.as_u64[1] = ip6_1->src_address.as_u64[1];
 440               key6_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 441
 442               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 443               if (PREDICT_FALSE
 444                   (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
 445                 {
 446                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 447
 448                   if (PREDICT_FALSE (p1 == NULL))
 449                     {
 450                       error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 451                       next1 = GENEVE_INPUT_NEXT_DROP;
 452                       goto trace1;
 453                     }
 454
 455                   clib_memcpy_fast (&last_key6, &key6_1, sizeof (key6_1));
 456                   tunnel_index1 = last_tunnel_index = p1[0];
 457                 }
 458               else
 459                 tunnel_index1 = last_tunnel_index;
 460               t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1);
 461
 462               /* Validate GENEVE tunnel encap-fib index against packet */
 463               if (PREDICT_FALSE (validate_geneve_fib (b1, t1, is_ip4) == 0))
 464                 {
 465                   error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 466                   next1 = GENEVE_INPUT_NEXT_DROP;
 467                   goto trace1;
 468                 }
 469
 470               /* Validate GENEVE tunnel SIP against packet DIP */
 471               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
 472                                                       &t1->local.ip6)))
 473                 goto next1;     /* valid packet */
 474               if (PREDICT_FALSE
 475                   (ip6_address_is_multicast (&ip6_1->dst_address)))
 476                 {
 477                   key6_1.remote.as_u64[0] = ip6_1->dst_address.as_u64[0];
 478                   key6_1.remote.as_u64[1] = ip6_1->dst_address.as_u64[1];
 479                   key6_1.vni = vnet_get_geneve_vni_bigendian (geneve1);
 480                   p1 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_1);
 481                   if (PREDICT_TRUE (p1 != NULL))
 482                     {
 483                       mt1 = pool_elt_at_index (vxm->tunnels, p1[0]);
 484                       goto next1;       /* valid packet */
 485                     }
 486                 }
 487               error1 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 488               next1 = GENEVE_INPUT_NEXT_DROP;
 489               goto trace1;
 490             }
 491
 492         next1:
 493           next1 = t1->decap_next_index;
 494           sw_if_index1 = t1->sw_if_index;
 495           len1 = vlib_buffer_length_in_chain (vm, b1);
 496
 497           /* Required to make the l2 tag push / pop code work on l2 subifs */
 498           if (PREDICT_TRUE (next1 == GENEVE_INPUT_NEXT_L2_INPUT))
 499             vnet_update_l2_len (b1);
 500
 501           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 502           vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;
 503           sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
 504
 505           pkts_decapsulated++;
 506           stats_n_packets += 1;
 507           stats_n_bytes += len1;
 508
 509           /* Batch stats increment on the same geneve tunnel so counter
 510              is not incremented per packet */
 511           if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
 512             {
 513               stats_n_packets -= 1;
 514               stats_n_bytes -= len1;
 515               if (stats_n_packets)
 516                 vlib_increment_combined_counter
 517                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 518                    thread_index, stats_sw_if_index,
 519                    stats_n_packets, stats_n_bytes);
 520               stats_n_packets = 1;
 521               stats_n_bytes = len1;
 522               stats_sw_if_index = sw_if_index1;
 523             }
 524
 525         trace1:
 526           b1->error = error1 ? node->errors[error1] : 0;
 527
 528           if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 529             {
 530               geneve_rx_trace_t *tr
 531                 = vlib_add_trace (vm, node, b1, sizeof (*tr));
 532               tr->next_index = next1;
 533               tr->error = error1;
 534               tr->tunnel_index = tunnel_index1;
 535               tr->vni_rsvd = vnet_get_geneve_vni (geneve1);
 536             }
 537
 538           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 539                                            to_next, n_left_to_next,
 540                                            bi0, bi1, next0, next1);
 541         }
 542
 543       while (n_left_from > 0 && n_left_to_next > 0)
 544         {
 545           u32 bi0;
 546           vlib_buffer_t *b0;
 547           u32 next0;
 548           ip4_header_t *ip4_0;
 549           ip6_header_t *ip6_0;
 550           geneve_header_t *geneve0;
 551           uword *p0;
 552           u32 tunnel_index0;
 553           geneve_tunnel_t *t0, *mt0 = NULL;
 554           geneve4_tunnel_key_t key4_0;
 555           geneve6_tunnel_key_t key6_0;
 556           u32 error0;
 557           u32 sw_if_index0, len0;
 558
 559           bi0 = from[0];
 560           to_next[0] = bi0;
 561           from += 1;
 562           to_next += 1;
 563           n_left_from -= 1;
 564           n_left_to_next -= 1;
 565
 566           b0 = vlib_get_buffer (vm, bi0);
 567
 568           /* udp leaves current_data pointing at the geneve header */
 569           geneve0 = vlib_buffer_get_current (b0);
 570           vnet_geneve_hdr_1word_ntoh (geneve0);
 571
 572           if (is_ip4)
 573             {
 574               vlib_buffer_advance
 575                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t)));
 576               ip4_0 = vlib_buffer_get_current (b0);
 577             }
 578           else
 579             {
 580               vlib_buffer_advance
 581                 (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t)));
 582               ip6_0 = vlib_buffer_get_current (b0);
 583             }
 584
 585           /* pop (ip, udp, geneve) */
 586           if (is_ip4)
 587             {
 588               vlib_buffer_advance
 589                 (b0,
 590                  sizeof (*ip4_0) + sizeof (udp_header_t) +
 591                  GENEVE_BASE_HEADER_LENGTH +
 592                  vnet_get_geneve_options_len (geneve0));
 593             }
 594           else
 595             {
 596               vlib_buffer_advance
 597                 (b0,
 598                  sizeof (*ip6_0) + sizeof (udp_header_t) +
 599                  GENEVE_BASE_HEADER_LENGTH +
 600                  vnet_get_geneve_options_len (geneve0));
 601             }
 602
 603           tunnel_index0 = ~0;
 604           error0 = 0;
 605
 606           if (PREDICT_FALSE
 607               (vnet_get_geneve_version (geneve0) != GENEVE_VERSION))
 608             {
 609               error0 = GENEVE_ERROR_BAD_FLAGS;
 610               next0 = GENEVE_INPUT_NEXT_DROP;
 611               goto trace00;
 612             }
 613 #if SUPPORT_OPTIONS_HEADER==1
 614           if (PREDICT_FALSE (vnet_get_geneve_critical_bit (geneve0) == 1))
 615             {
 616               error0 = GENEVE_ERROR_BAD_FLAGS;
 617               next0 = GENEVE_INPUT_NEXT_DROP;
 618               goto trace00;
 619             }
 620 #endif
 621           if (is_ip4)
 622             {
 623               key4_0.remote = ip4_0->src_address.as_u32;
 624               key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 625
 626               /* Make sure unicast GENEVE tunnel exist by packet SIP and VNI */
 627               if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
 628                 {
 629                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 630                   if (PREDICT_FALSE (p0 == NULL))
 631                     {
 632                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 633                       next0 = GENEVE_INPUT_NEXT_DROP;
 634                       goto trace00;
 635                     }
 636                   last_key4.as_u64 = key4_0.as_u64;
 637                   tunnel_index0 = last_tunnel_index = p0[0];
 638                 }
 639               else
 640                 tunnel_index0 = last_tunnel_index;
 641               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 642
 643               /* Validate GENEVE tunnel encap-fib index agaist packet */
 644               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 645                 {
 646                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 647                   next0 = GENEVE_INPUT_NEXT_DROP;
 648                   goto trace00;
 649                 }
 650
 651               /* Validate GENEVE tunnel SIP against packet DIP */
 652               if (PREDICT_TRUE
 653                   (ip4_0->dst_address.as_u32 == t0->local.ip4.as_u32))
 654                 goto next00;    /* valid packet */
 655               if (PREDICT_FALSE
 656                   (ip4_address_is_multicast (&ip4_0->dst_address)))
 657                 {
 658                   key4_0.remote = ip4_0->dst_address.as_u32;
 659                   key4_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 660                   /* Make sure mcast GENEVE tunnel exist by packet DIP and VNI */
 661                   p0 = hash_get (vxm->geneve4_tunnel_by_key, key4_0.as_u64);
 662                   if (PREDICT_TRUE (p0 != NULL))
 663                     {
 664                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 665                       goto next00;      /* valid packet */
 666                     }
 667                 }
 668               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 669               next0 = GENEVE_INPUT_NEXT_DROP;
 670               goto trace00;
 671
 672             }
 673           else                  /* !is_ip4 */
 674             {
 675               key6_0.remote.as_u64[0] = ip6_0->src_address.as_u64[0];
 676               key6_0.remote.as_u64[1] = ip6_0->src_address.as_u64[1];
 677               key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 678
 679               /* Make sure GENEVE tunnel exist according to packet SIP and VNI */
 680               if (PREDICT_FALSE
 681                   (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
 682                 {
 683                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 684                   if (PREDICT_FALSE (p0 == NULL))
 685                     {
 686                       error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 687                       next0 = GENEVE_INPUT_NEXT_DROP;
 688                       goto trace00;
 689                     }
 690                   clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0));
 691                   tunnel_index0 = last_tunnel_index = p0[0];
 692                 }
 693               else
 694                 tunnel_index0 = last_tunnel_index;
 695               t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0);
 696
 697               /* Validate GENEVE tunnel encap-fib index agaist packet */
 698               if (PREDICT_FALSE (validate_geneve_fib (b0, t0, is_ip4) == 0))
 699                 {
 700                   error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 701                   next0 = GENEVE_INPUT_NEXT_DROP;
 702                   goto trace00;
 703                 }
 704
 705               /* Validate GENEVE tunnel SIP against packet DIP */
 706               if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
 707                                                       &t0->local.ip6)))
 708                 goto next00;    /* valid packet */
 709               if (PREDICT_FALSE
 710                   (ip6_address_is_multicast (&ip6_0->dst_address)))
 711                 {
 712                   key6_0.remote.as_u64[0] = ip6_0->dst_address.as_u64[0];
 713                   key6_0.remote.as_u64[1] = ip6_0->dst_address.as_u64[1];
 714                   key6_0.vni = vnet_get_geneve_vni_bigendian (geneve0);
 715                   p0 = hash_get_mem (vxm->geneve6_tunnel_by_key, &key6_0);
 716                   if (PREDICT_TRUE (p0 != NULL))
 717                     {
 718                       mt0 = pool_elt_at_index (vxm->tunnels, p0[0]);
 719                       goto next00;      /* valid packet */
 720                     }
 721                 }
 722               error0 = GENEVE_ERROR_NO_SUCH_TUNNEL;
 723               next0 = GENEVE_INPUT_NEXT_DROP;
 724               goto trace00;
 725             }
 726
 727         next00:
 728           next0 = t0->decap_next_index;
 729           sw_if_index0 = t0->sw_if_index;
 730           len0 = vlib_buffer_length_in_chain (vm, b0);
 731
 732           /* Required to make the l2 tag push / pop code work on l2 subifs */
 733           if (PREDICT_TRUE (next0 == GENEVE_INPUT_NEXT_L2_INPUT))
 734             vnet_update_l2_len (b0);
 735
 736           /* Set packet input sw_if_index to unicast GENEVE tunnel for learning */
 737           vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 738           sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
 739
 740           pkts_decapsulated++;
 741           stats_n_packets += 1;
 742           stats_n_bytes += len0;
 743
 744           /* Batch stats increment on the same geneve tunnel so counter
 745              is not incremented per packet */
 746           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 747             {
 748               stats_n_packets -= 1;
 749               stats_n_bytes -= len0;
 750               if (stats_n_packets)
 751                 vlib_increment_combined_counter
 752                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 753                    thread_index, stats_sw_if_index,
 754                    stats_n_packets, stats_n_bytes);
 755               stats_n_packets = 1;
 756               stats_n_bytes = len0;
 757               stats_sw_if_index = sw_if_index0;
 758             }
 759
 760         trace00:
 761           b0->error = error0 ? node->errors[error0] : 0;
 762
 763           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 764             {
 765               geneve_rx_trace_t *tr
 766                 = vlib_add_trace (vm, node, b0, sizeof (*tr));
 767               tr->next_index = next0;
 768               tr->error = error0;
 769               tr->tunnel_index = tunnel_index0;
 770               tr->vni_rsvd = vnet_get_geneve_vni (geneve0);
 771             }
 772           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 773                                            to_next, n_left_to_next,
 774                                            bi0, next0);
 775         }
 776
 777       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 778     }
 779   /* Do we still need this now that tunnel tx stats is kept? */
 780   vlib_node_increment_counter (vm, is_ip4 ?
 781                                geneve4_input_node.
 782                                index : geneve6_input_node.index,
 783                                GENEVE_ERROR_DECAPSULATED, pkts_decapsulated);
 784
 785   /* Increment any remaining batch stats */
 786   if (stats_n_packets)
 787     {
 788       vlib_increment_combined_counter
 789         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
 790          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 791       node->runtime_data[0] = stats_sw_if_index;
 792     }
 793
 794   return from_frame->n_vectors;
 795 }
 796
 797 VLIB_NODE_FN (geneve4_input_node) (vlib_main_t * vm,
 798                                    vlib_node_runtime_t * node,
 799                                    vlib_frame_t * from_frame)
 800 {
 801   return geneve_input (vm, node, from_frame, /* is_ip4 */ 1);
 802 }
 803
 804 VLIB_NODE_FN (geneve6_input_node) (vlib_main_t * vm,
 805                                    vlib_node_runtime_t * node,
 806                                    vlib_frame_t * from_frame)
 807 {
 808   return geneve_input (vm, node, from_frame, /* is_ip4 */ 0);
 809 }
 810
 811 static char *geneve_error_strings[] = {
 812 #define geneve_error(n,s) s,
 813 #include <vnet/geneve/geneve_error.def>
 814 #undef geneve_error
 815 #undef _
 816 };
 817
 818 /* *INDENT-OFF* */
 819 VLIB_REGISTER_NODE (geneve4_input_node) = {
 820   .name = "geneve4-input",
 821   /* Takes a vector of packets. */
 822   .vector_size = sizeof (u32),
 823   .n_errors = GENEVE_N_ERROR,
 824   .error_strings = geneve_error_strings,
 825   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 826   .next_nodes = {
 827 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 828     foreach_geneve_input_next
 829 #undef _
 830   },
 831
 832 //temp  .format_buffer = format_geneve_header,
 833   .format_trace = format_geneve_rx_trace,
 834   // $$$$ .unformat_buffer = unformat_geneve_header,
 835 };
 836
 837 VLIB_REGISTER_NODE (geneve6_input_node) = {
 838   .name = "geneve6-input",
 839   /* Takes a vector of packets. */
 840   .vector_size = sizeof (u32),
 841   .n_errors = GENEVE_N_ERROR,
 842   .error_strings = geneve_error_strings,
 843   .n_next_nodes = GENEVE_INPUT_N_NEXT,
 844   .next_nodes = {
 845 #define _(s,n) [GENEVE_INPUT_NEXT_##s] = n,
 846   foreach_geneve_input_next
 847 #undef _
 848   },
 849 //temp  .format_buffer = format_geneve_header,
 850   .format_trace = format_geneve_rx_trace,
 851   // $$$$ .unformat_buffer = unformat_geneve_header,
 852 };
 853 /* *INDENT-ON* */
 854
 855 typedef enum
 856 {
 857   IP_GENEVE_BYPASS_NEXT_DROP,
 858   IP_GENEVE_BYPASS_NEXT_GENEVE,
 859   IP_GENEVE_BYPASS_N_NEXT,
 860 } ip_vxan_bypass_next_t;
 861
 862 always_inline uword
 863 ip_geneve_bypass_inline (vlib_main_t * vm,
 864                          vlib_node_runtime_t * node,
 865                          vlib_frame_t * frame, u32 is_ip4)
 866 {
 867   geneve_main_t *vxm = &geneve_main;
 868   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
 869   vlib_node_runtime_t *error_node =
 870     vlib_node_get_runtime (vm, ip4_input_node.index);
 871   ip4_address_t addr4;          /* last IPv4 address matching a local VTEP address */
 872   ip6_address_t addr6;          /* last IPv6 address matching a local VTEP address */
 873
 874   from = vlib_frame_vector_args (frame);
 875   n_left_from = frame->n_vectors;
 876   next_index = node->cached_next_index;
 877
 878   if (node->flags & VLIB_NODE_FLAG_TRACE)
 879     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 880
 881   if (is_ip4)
 882     addr4.data_u32 = ~0;
 883   else
 884     ip6_address_set_zero (&addr6);
 885
 886   while (n_left_from > 0)
 887     {
 888       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 889
 890       while (n_left_from >= 4 && n_left_to_next >= 2)
 891         {
 892           vlib_buffer_t *b0, *b1;
 893           ip4_header_t *ip40, *ip41;
 894           ip6_header_t *ip60, *ip61;
 895           udp_header_t *udp0, *udp1;
 896           u32 bi0, ip_len0, udp_len0, flags0, next0;
 897           u32 bi1, ip_len1, udp_len1, flags1, next1;
 898           i32 len_diff0, len_diff1;
 899           u8 error0, good_udp0, proto0;
 900           u8 error1, good_udp1, proto1;
 901
 902           /* Prefetch next iteration. */
 903           {
 904             vlib_buffer_t *p2, *p3;
 905
 906             p2 = vlib_get_buffer (vm, from[2]);
 907             p3 = vlib_get_buffer (vm, from[3]);
 908
 909             vlib_prefetch_buffer_header (p2, LOAD);
 910             vlib_prefetch_buffer_header (p3, LOAD);
 911
 912             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 913             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 914           }
 915
 916           bi0 = to_next[0] = from[0];
 917           bi1 = to_next[1] = from[1];
 918           from += 2;
 919           n_left_from -= 2;
 920           to_next += 2;
 921           n_left_to_next -= 2;
 922
 923           b0 = vlib_get_buffer (vm, bi0);
 924           b1 = vlib_get_buffer (vm, bi1);
 925           if (is_ip4)
 926             {
 927               ip40 = vlib_buffer_get_current (b0);
 928               ip41 = vlib_buffer_get_current (b1);
 929             }
 930           else
 931             {
 932               ip60 = vlib_buffer_get_current (b0);
 933               ip61 = vlib_buffer_get_current (b1);
 934             }
 935
 936           /* Setup packet for next IP feature */
 937           vnet_feature_next (&next0, b0);
 938           vnet_feature_next (&next1, b1);
 939
 940           if (is_ip4)
 941             {
 942               /* Treat IP frag packets as "experimental" protocol for now
 943                  until support of IP frag reassembly is implemented */
 944               proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
 945               proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
 946             }
 947           else
 948             {
 949               proto0 = ip60->protocol;
 950               proto1 = ip61->protocol;
 951             }
 952
 953           /* Process packet 0 */
 954           if (proto0 != IP_PROTOCOL_UDP)
 955             goto exit0;         /* not UDP packet */
 956
 957           if (is_ip4)
 958             udp0 = ip4_next_header (ip40);
 959           else
 960             udp0 = ip6_next_header (ip60);
 961
 962           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
 963             goto exit0;         /* not GENEVE packet */
 964
 965           /* Validate DIP against VTEPs */
 966           if (is_ip4)
 967             {
 968               if (addr4.as_u32 != ip40->dst_address.as_u32)
 969                 {
 970                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
 971                     goto exit0; /* no local VTEP for GENEVE packet */
 972                   addr4 = ip40->dst_address;
 973                 }
 974             }
 975           else
 976             {
 977               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
 978                 {
 979                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
 980                     goto exit0; /* no local VTEP for GENEVE packet */
 981                   addr6 = ip60->dst_address;
 982                 }
 983             }
 984
 985           flags0 = b0->flags;
 986           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
 987
 988           /* Don't verify UDP checksum for packets with explicit zero checksum. */
 989           good_udp0 |= udp0->checksum == 0;
 990
 991           /* Verify UDP length */
 992           if (is_ip4)
 993             ip_len0 = clib_net_to_host_u16 (ip40->length);
 994           else
 995             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
 996           udp_len0 = clib_net_to_host_u16 (udp0->length);
 997           len_diff0 = ip_len0 - udp_len0;
 998
 999           /* Verify UDP checksum */
1000           if (PREDICT_FALSE (!good_udp0))
1001             {
1002               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1003                 {
1004                   if (is_ip4)
1005                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1006                   else
1007                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1008                   good_udp0 =
1009                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1010                 }
1011             }
1012
1013           if (is_ip4)
1014             {
1015               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1016               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1017             }
1018           else
1019             {
1020               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1021               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1022             }
1023
1024           next0 = error0 ?
1025             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1026           b0->error = error0 ? error_node->errors[error0] : 0;
1027
1028           /* geneve-input node expect current at GENEVE header */
1029           if (is_ip4)
1030             vlib_buffer_advance (b0,
1031                                  sizeof (ip4_header_t) +
1032                                  sizeof (udp_header_t));
1033           else
1034             vlib_buffer_advance (b0,
1035                                  sizeof (ip6_header_t) +
1036                                  sizeof (udp_header_t));
1037
1038         exit0:
1039           /* Process packet 1 */
1040           if (proto1 != IP_PROTOCOL_UDP)
1041             goto exit1;         /* not UDP packet */
1042
1043           if (is_ip4)
1044             udp1 = ip4_next_header (ip41);
1045           else
1046             udp1 = ip6_next_header (ip61);
1047
1048           if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1049             goto exit1;         /* not GENEVE packet */
1050
1051           /* Validate DIP against VTEPs */
1052           if (is_ip4)
1053             {
1054               if (addr4.as_u32 != ip41->dst_address.as_u32)
1055                 {
1056                   if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
1057                     goto exit1; /* no local VTEP for GENEVE packet */
1058                   addr4 = ip41->dst_address;
1059                 }
1060             }
1061           else
1062             {
1063               if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
1064                 {
1065                   if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
1066                     goto exit1; /* no local VTEP for GENEVE packet */
1067                   addr6 = ip61->dst_address;
1068                 }
1069             }
1070
1071           flags1 = b1->flags;
1072           good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1073
1074           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1075           good_udp1 |= udp1->checksum == 0;
1076
1077           /* Verify UDP length */
1078           if (is_ip4)
1079             ip_len1 = clib_net_to_host_u16 (ip41->length);
1080           else
1081             ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
1082           udp_len1 = clib_net_to_host_u16 (udp1->length);
1083           len_diff1 = ip_len1 - udp_len1;
1084
1085           /* Verify UDP checksum */
1086           if (PREDICT_FALSE (!good_udp1))
1087             {
1088               if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1089                 {
1090                   if (is_ip4)
1091                     flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
1092                   else
1093                     flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
1094                   good_udp1 =
1095                     (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1096                 }
1097             }
1098
1099           if (is_ip4)
1100             {
1101               error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1102               error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
1103             }
1104           else
1105             {
1106               error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1107               error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
1108             }
1109
1110           next1 = error1 ?
1111             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1112           b1->error = error1 ? error_node->errors[error1] : 0;
1113
1114           /* geneve-input node expect current at GENEVE header */
1115           if (is_ip4)
1116             vlib_buffer_advance (b1,
1117                                  sizeof (ip4_header_t) +
1118                                  sizeof (udp_header_t));
1119           else
1120             vlib_buffer_advance (b1,
1121                                  sizeof (ip6_header_t) +
1122                                  sizeof (udp_header_t));
1123
1124         exit1:
1125           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1126                                            to_next, n_left_to_next,
1127                                            bi0, bi1, next0, next1);
1128         }
1129
1130       while (n_left_from > 0 && n_left_to_next > 0)
1131         {
1132           vlib_buffer_t *b0;
1133           ip4_header_t *ip40;
1134           ip6_header_t *ip60;
1135           udp_header_t *udp0;
1136           u32 bi0, ip_len0, udp_len0, flags0, next0;
1137           i32 len_diff0;
1138           u8 error0, good_udp0, proto0;
1139
1140           bi0 = to_next[0] = from[0];
1141           from += 1;
1142           n_left_from -= 1;
1143           to_next += 1;
1144           n_left_to_next -= 1;
1145
1146           b0 = vlib_get_buffer (vm, bi0);
1147           if (is_ip4)
1148             ip40 = vlib_buffer_get_current (b0);
1149           else
1150             ip60 = vlib_buffer_get_current (b0);
1151
1152           /* Setup packet for next IP feature */
1153           vnet_feature_next (&next0, b0);
1154
1155           if (is_ip4)
1156             /* Treat IP4 frag packets as "experimental" protocol for now
1157                until support of IP frag reassembly is implemented */
1158             proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
1159           else
1160             proto0 = ip60->protocol;
1161
1162           if (proto0 != IP_PROTOCOL_UDP)
1163             goto exit;          /* not UDP packet */
1164
1165           if (is_ip4)
1166             udp0 = ip4_next_header (ip40);
1167           else
1168             udp0 = ip6_next_header (ip60);
1169
1170           if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_geneve))
1171             goto exit;          /* not GENEVE packet */
1172
1173           /* Validate DIP against VTEPs */
1174           if (is_ip4)
1175             {
1176               if (addr4.as_u32 != ip40->dst_address.as_u32)
1177                 {
1178                   if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
1179                     goto exit;  /* no local VTEP for GENEVE packet */
1180                   addr4 = ip40->dst_address;
1181                 }
1182             }
1183           else
1184             {
1185               if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
1186                 {
1187                   if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
1188                     goto exit;  /* no local VTEP for GENEVE packet */
1189                   addr6 = ip60->dst_address;
1190                 }
1191             }
1192
1193           flags0 = b0->flags;
1194           good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1195
1196           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1197           good_udp0 |= udp0->checksum == 0;
1198
1199           /* Verify UDP length */
1200           if (is_ip4)
1201             ip_len0 = clib_net_to_host_u16 (ip40->length);
1202           else
1203             ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
1204           udp_len0 = clib_net_to_host_u16 (udp0->length);
1205           len_diff0 = ip_len0 - udp_len0;
1206
1207           /* Verify UDP checksum */
1208           if (PREDICT_FALSE (!good_udp0))
1209             {
1210               if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1211                 {
1212                   if (is_ip4)
1213                     flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
1214                   else
1215                     flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
1216                   good_udp0 =
1217                     (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1218                 }
1219             }
1220
1221           if (is_ip4)
1222             {
1223               error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
1224               error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
1225             }
1226           else
1227             {
1228               error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
1229               error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
1230             }
1231
1232           next0 = error0 ?
1233             IP_GENEVE_BYPASS_NEXT_DROP : IP_GENEVE_BYPASS_NEXT_GENEVE;
1234           b0->error = error0 ? error_node->errors[error0] : 0;
1235
1236           /* geneve-input node expect current at GENEVE header */
1237           if (is_ip4)
1238             vlib_buffer_advance (b0,
1239                                  sizeof (ip4_header_t) +
1240                                  sizeof (udp_header_t));
1241           else
1242             vlib_buffer_advance (b0,
1243                                  sizeof (ip6_header_t) +
1244                                  sizeof (udp_header_t));
1245
1246         exit:
1247           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1248                                            to_next, n_left_to_next,
1249                                            bi0, next0);
1250         }
1251
1252       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1253     }
1254
1255   return frame->n_vectors;
1256 }
1257
1258 VLIB_NODE_FN (ip4_geneve_bypass_node) (vlib_main_t * vm,
1259                                        vlib_node_runtime_t * node,
1260                                        vlib_frame_t * frame)
1261 {
1262   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
1263 }
1264
1265 /* *INDENT-OFF* */
1266 VLIB_REGISTER_NODE (ip4_geneve_bypass_node) =
1267 {
1268   .name = "ip4-geneve-bypass",.vector_size =
1269     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1270   {
1271   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1272       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve4-input",}
1273 ,.format_buffer = format_ip4_header,.format_trace =
1274     format_ip4_forward_next_trace,};
1275
1276 #ifndef CLIB_MARCH_VARIANT
1277 /* Dummy init function to get us linked in. */
1278      clib_error_t *ip4_geneve_bypass_init (vlib_main_t * vm)
1279 {
1280   return 0;
1281 }
1282
1283 VLIB_INIT_FUNCTION (ip4_geneve_bypass_init);
1284 /* *INDENT-ON* */
1285 #endif /* CLIB_MARCH_VARIANT */
1286
1287 VLIB_NODE_FN (ip6_geneve_bypass_node) (vlib_main_t * vm,
1288                                        vlib_node_runtime_t * node,
1289                                        vlib_frame_t * frame)
1290 {
1291   return ip_geneve_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
1292 }
1293
1294 /* *INDENT-OFF* */
1295 VLIB_REGISTER_NODE (ip6_geneve_bypass_node) =
1296 {
1297   .name = "ip6-geneve-bypass",.vector_size =
1298     sizeof (u32),.n_next_nodes = IP_GENEVE_BYPASS_N_NEXT,.next_nodes =
1299   {
1300   [IP_GENEVE_BYPASS_NEXT_DROP] = "error-drop",
1301       [IP_GENEVE_BYPASS_NEXT_GENEVE] = "geneve6-input",}
1302 ,.format_buffer = format_ip6_header,.format_trace =
1303     format_ip6_forward_next_trace,};
1304 /* *INDENT-ON* */
1305
1306 #ifndef CLIB_MARCH_VARIANT
1307 /* Dummy init function to get us linked in. */
1308 clib_error_t *
1309 ip6_geneve_bypass_init (vlib_main_t * vm)
1310 {
1311   return 0;
1312 }
1313
1314 VLIB_INIT_FUNCTION (ip6_geneve_bypass_init);
1315 #endif /* CLIB_MARCH_VARIANT */
1316
1317 /*
1318  * fd.io coding-style-patch-verification: ON
1319  *
1320  * Local Variables:
1321  * eval: (c-set-style "gnu")
1322  * End:
1323  */