decap.c

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/*
 * decap.c - decapsulate VXLAN GPE
 *
 * Copyright (c) 2013 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 *  @file
 *  @brief Functions for decapsulating VXLAN GPE tunnels
 *
*/

#include <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/vxlan-gpe/vxlan_gpe.h>

vlib_node_registration_t vxlan_gpe_input_node;

/**
 * @brief Struct for VXLAN GPE decap packet tracing
 *
 */
typedef struct
{
  u32 next_index;
  u32 tunnel_index;
  u32 error;
} vxlan_gpe_rx_trace_t;

/**
 * @brief Tracing function for VXLAN GPE packet decapsulation
 *
 * @param *s
 * @param *args
 *
 * @return *s
 *
 */
static u8 *
format_vxlan_gpe_rx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  vxlan_gpe_rx_trace_t *t = va_arg (*args, vxlan_gpe_rx_trace_t *);

  if (t->tunnel_index != ~0)
    {
      s = format (s, "VXLAN-GPE: tunnel %d next %d error %d", t->tunnel_index,
                  t->next_index, t->error);
    }
  else
    {
      s = format (s, "VXLAN-GPE: no tunnel next %d error %d\n", t->next_index,
                  t->error);
    }
  return s;
}

/**
 * @brief Tracing function for VXLAN GPE packet decapsulation including length
 *
 * @param *s
 * @param *args
 *
 * @return *s
 *
 */
static u8 *
format_vxlan_gpe_with_length (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);


  return s;
}

/**
 * @brief Common processing for IPv4 and IPv6 VXLAN GPE decap dispatch functions
 *
 * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
 * tunnels are "terminate local". This means that there is no "TX" interface for this
 * decap case, so that field in the buffer_metadata can be "used for something else".
 * The something else in this case is, for the IPv4/IPv6 inner-packet type case, the
 * FIB index used to look up the inner-packet's adjacency.
 *
 *      vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
 *
 * @param *vm
 * @param *node
 * @param *from_frame
 * @param is_ip4
 *
 * @return from_frame->n_vectors
 *
 */
always_inline uword
vxlan_gpe_input (vlib_main_t * vm,
                 vlib_node_runtime_t * node,
                 vlib_frame_t * from_frame, u8 is_ip4)
{
  u32 n_left_from, next_index, *from, *to_next;
  vxlan_gpe_main_t *nngm = &vxlan_gpe_main;
  vnet_main_t *vnm = nngm->vnet_main;
  vnet_interface_main_t *im = &vnm->interface_main;
  u32 last_tunnel_index = ~0;
  vxlan4_gpe_tunnel_key_t last_key4;
  vxlan6_gpe_tunnel_key_t last_key6;
  u32 pkts_decapsulated = 0;
  u32 thread_index = vm->thread_index;
  u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;

  if (is_ip4)
    clib_memset (&last_key4, 0xff, sizeof (last_key4));
  else
    clib_memset (&last_key6, 0xff, sizeof (last_key6));

  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;
  stats_sw_if_index = node->runtime_data[0];
  stats_n_packets = stats_n_bytes = 0;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          u32 bi0, bi1;
          vlib_buffer_t *b0, *b1;
          u32 next0, next1;
          ip4_vxlan_gpe_header_t *iuvn4_0, *iuvn4_1;
          ip6_vxlan_gpe_header_t *iuvn6_0, *iuvn6_1;
          uword *p0, *p1;
          u32 tunnel_index0, tunnel_index1;
          vxlan_gpe_tunnel_t *t0, *t1;
          vxlan4_gpe_tunnel_key_t key4_0, key4_1;
          vxlan6_gpe_tunnel_key_t key6_0, key6_1;
          u32 error0, error1;
          u32 sw_if_index0, sw_if_index1, len0, len1;

          /* Prefetch next iteration. */
          {
            vlib_buffer_t *p2, *p3;

            p2 = vlib_get_buffer (vm, from[2]);
            p3 = vlib_get_buffer (vm, from[3]);

            vlib_prefetch_buffer_header (p2, LOAD);
            vlib_prefetch_buffer_header (p3, LOAD);

            CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
            CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
          }

          bi0 = from[0];
          bi1 = from[1];
          to_next[0] = bi0;
          to_next[1] = bi1;
          from += 2;
          to_next += 2;
          n_left_to_next -= 2;
          n_left_from -= 2;

          b0 = vlib_get_buffer (vm, bi0);
          b1 = vlib_get_buffer (vm, bi1);

          if (is_ip4)
            {
              /* udp leaves current_data pointing at the vxlan-gpe header */
              vlib_buffer_advance (b0,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip4_header_t)));
              vlib_buffer_advance (b1,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip4_header_t)));

              iuvn4_0 = vlib_buffer_get_current (b0);
              iuvn4_1 = vlib_buffer_get_current (b1);

              /* pop (ip, udp, vxlan) */
              vlib_buffer_advance (b0, sizeof (*iuvn4_0));
              vlib_buffer_advance (b1, sizeof (*iuvn4_1));
            }
          else
            {
              /* udp leaves current_data pointing at the vxlan-gpe header */
              vlib_buffer_advance (b0,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip6_header_t)));
              vlib_buffer_advance (b1,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip6_header_t)));

              iuvn6_0 = vlib_buffer_get_current (b0);
              iuvn6_1 = vlib_buffer_get_current (b1);

              /* pop (ip, udp, vxlan) */
              vlib_buffer_advance (b0, sizeof (*iuvn6_0));
              vlib_buffer_advance (b1, sizeof (*iuvn6_1));
            }

          tunnel_index0 = ~0;
          tunnel_index1 = ~0;
          error0 = 0;
          error1 = 0;

          if (is_ip4)
            {
              next0 =
                (iuvn4_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn4_0->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;
              next1 =
                (iuvn4_1->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn4_1->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;

              key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
              key4_1.local = iuvn4_1->ip4.dst_address.as_u32;

              key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
              key4_1.remote = iuvn4_1->ip4.src_address.as_u32;

              key4_0.vni = iuvn4_0->vxlan.vni_res;
              key4_1.vni = iuvn4_1->vxlan.vni_res;

              key4_0.pad = 0;
              key4_1.pad = 0;
            }
          else                  /* is_ip6 */
            {
              next0 = (iuvn6_0->vxlan.protocol < node->n_next_nodes) ?
                iuvn6_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
              next1 = (iuvn6_1->vxlan.protocol < node->n_next_nodes) ?
                iuvn6_1->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;

              key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
              key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
              key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0];
              key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1];

              key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
              key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
              key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0];
              key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1];

              key6_0.vni = iuvn6_0->vxlan.vni_res;
              key6_1.vni = iuvn6_1->vxlan.vni_res;
            }

          /* Processing packet 0 */
          if (is_ip4)
            {
              /* Processing for key4_0 */
              if (PREDICT_FALSE ((key4_0.as_u64[0] != last_key4.as_u64[0])
                                 || (key4_0.as_u64[1] !=
                                     last_key4.as_u64[1])))
                {
                  p0 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_0);

                  if (p0 == 0)
                    {
                      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace0;
                    }

                  last_key4.as_u64[0] = key4_0.as_u64[0];
                  last_key4.as_u64[1] = key4_0.as_u64[1];
                  tunnel_index0 = last_tunnel_index = p0[0];
                }
              else
                tunnel_index0 = last_tunnel_index;
            }
          else                  /* is_ip6 */
            {
              next0 =
                (iuvn6_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn6_0->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;
              next1 =
                (iuvn6_1->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn6_1->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;

              key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
              key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
              key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0];
              key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1];

              key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
              key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
              key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0];
              key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1];

              key6_0.vni = iuvn6_0->vxlan.vni_res;
              key6_1.vni = iuvn6_1->vxlan.vni_res;

              /* Processing for key6_0 */
              if (PREDICT_FALSE
                  (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
                {
                  p0 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_0);

                  if (p0 == 0)
                    {
                      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace0;
                    }

                  memcpy (&last_key6, &key6_0, sizeof (key6_0));
                  tunnel_index0 = last_tunnel_index = p0[0];
                }
              else
                tunnel_index0 = last_tunnel_index;
            }

          t0 = pool_elt_at_index (nngm->tunnels, tunnel_index0);


          sw_if_index0 = t0->sw_if_index;
          len0 = vlib_buffer_length_in_chain (vm, b0);

          /* Required to make the l2 tag push / pop code work on l2 subifs */
          vnet_update_l2_len (b0);

          /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
          vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;

      /**
       * ip[46] lookup in the configured FIB
       */
          vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;

          pkts_decapsulated++;
          stats_n_packets += 1;
          stats_n_bytes += len0;

          if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
            {
              stats_n_packets -= 1;
              stats_n_bytes -= len0;
              if (stats_n_packets)
                vlib_increment_combined_counter (im->combined_sw_if_counters +
                                                 VNET_INTERFACE_COUNTER_RX,
                                                 thread_index,
                                                 stats_sw_if_index,
                                                 stats_n_packets,
                                                 stats_n_bytes);
              stats_n_packets = 1;
              stats_n_bytes = len0;
              stats_sw_if_index = sw_if_index0;
            }

        trace0:b0->error = error0 ? node->errors[error0] : 0;

          if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              vxlan_gpe_rx_trace_t *tr =
                vlib_add_trace (vm, node, b0, sizeof (*tr));
              tr->next_index = next0;
              tr->error = error0;
              tr->tunnel_index = tunnel_index0;
            }

          /* Process packet 1 */
          if (is_ip4)
            {
              /* Processing for key4_1 */
              if (PREDICT_FALSE ((key4_1.as_u64[0] != last_key4.as_u64[0])
                                 || (key4_1.as_u64[1] !=
                                     last_key4.as_u64[1])))
                {
                  p1 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_1);

                  if (p1 == 0)
                    {
                      error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace1;
                    }

                  last_key4.as_u64[0] = key4_1.as_u64[0];
                  last_key4.as_u64[1] = key4_1.as_u64[1];
                  tunnel_index1 = last_tunnel_index = p1[0];
                }
              else
                tunnel_index1 = last_tunnel_index;
            }
          else                  /* is_ip6 */
            {
              /* Processing for key6_1 */
              if (PREDICT_FALSE
                  (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
                {
                  p1 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_1);

                  if (p1 == 0)
                    {
                      error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace1;
                    }

                  memcpy (&last_key6, &key6_1, sizeof (key6_1));
                  tunnel_index1 = last_tunnel_index = p1[0];
                }
              else
                tunnel_index1 = last_tunnel_index;
            }

          t1 = pool_elt_at_index (nngm->tunnels, tunnel_index1);

          sw_if_index1 = t1->sw_if_index;
          len1 = vlib_buffer_length_in_chain (vm, b1);

          /* Required to make the l2 tag push / pop code work on l2 subifs */
          vnet_update_l2_len (b1);

          /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
          vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;

          /*
           * ip[46] lookup in the configured FIB
           */
          vnet_buffer (b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;

          pkts_decapsulated++;
          stats_n_packets += 1;
          stats_n_bytes += len1;

          /* Batch stats increment on the same vxlan tunnel so counter
             is not incremented per packet */
          if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
            {
              stats_n_packets -= 1;
              stats_n_bytes -= len1;
              if (stats_n_packets)
                vlib_increment_combined_counter (im->combined_sw_if_counters +
                                                 VNET_INTERFACE_COUNTER_RX,
                                                 thread_index,
                                                 stats_sw_if_index,
                                                 stats_n_packets,
                                                 stats_n_bytes);
              stats_n_packets = 1;
              stats_n_bytes = len1;
              stats_sw_if_index = sw_if_index1;
            }
          vnet_buffer (b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;

        trace1:b1->error = error1 ? node->errors[error1] : 0;

          if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
            {
              vxlan_gpe_rx_trace_t *tr =
                vlib_add_trace (vm, node, b1, sizeof (*tr));
              tr->next_index = next1;
              tr->error = error1;
              tr->tunnel_index = tunnel_index1;
            }

          vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
                                           n_left_to_next, bi0, bi1, next0,
                                           next1);
        }

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 bi0;
          vlib_buffer_t *b0;
          u32 next0;
          ip4_vxlan_gpe_header_t *iuvn4_0;
          ip6_vxlan_gpe_header_t *iuvn6_0;
          uword *p0;
          u32 tunnel_index0;
          vxlan_gpe_tunnel_t *t0;
          vxlan4_gpe_tunnel_key_t key4_0;
          vxlan6_gpe_tunnel_key_t key6_0;
          u32 error0;
          u32 sw_if_index0, len0;

          bi0 = from[0];
          to_next[0] = bi0;
          from += 1;
          to_next += 1;
          n_left_from -= 1;
          n_left_to_next -= 1;

          b0 = vlib_get_buffer (vm, bi0);

          if (is_ip4)
            {
              /* udp leaves current_data pointing at the vxlan-gpe header */
              vlib_buffer_advance (b0,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip4_header_t)));

              iuvn4_0 = vlib_buffer_get_current (b0);

              /* pop (ip, udp, vxlan) */
              vlib_buffer_advance (b0, sizeof (*iuvn4_0));
            }
          else
            {
              /* udp leaves current_data pointing at the vxlan-gpe header */
              vlib_buffer_advance (b0,
                                   -(word) (sizeof (udp_header_t) +
                                            sizeof (ip6_header_t)));

              iuvn6_0 = vlib_buffer_get_current (b0);

              /* pop (ip, udp, vxlan) */
              vlib_buffer_advance (b0, sizeof (*iuvn6_0));
            }

          tunnel_index0 = ~0;
          error0 = 0;

          if (is_ip4)
            {
              next0 =
                (iuvn4_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn4_0->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;

              key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
              key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
              key4_0.vni = iuvn4_0->vxlan.vni_res;
              key4_0.pad = 0;

              /* Processing for key4_0 */
              if (PREDICT_FALSE ((key4_0.as_u64[0] != last_key4.as_u64[0])
                                 || (key4_0.as_u64[1] !=
                                     last_key4.as_u64[1])))
                {
                  p0 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_0);

                  if (p0 == 0)
                    {
                      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace00;
                    }

                  last_key4.as_u64[0] = key4_0.as_u64[0];
                  last_key4.as_u64[1] = key4_0.as_u64[1];
                  tunnel_index0 = last_tunnel_index = p0[0];
                }
              else
                tunnel_index0 = last_tunnel_index;
            }
          else                  /* is_ip6 */
            {
              next0 =
                (iuvn6_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
                nngm->decap_next_node_list[iuvn6_0->vxlan.protocol] :
                VXLAN_GPE_INPUT_NEXT_DROP;

              key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
              key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
              key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
              key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
              key6_0.vni = iuvn6_0->vxlan.vni_res;

              /* Processing for key6_0 */
              if (PREDICT_FALSE
                  (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
                {
                  p0 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_0);

                  if (p0 == 0)
                    {
                      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
                      goto trace00;
                    }

                  memcpy (&last_key6, &key6_0, sizeof (key6_0));
                  tunnel_index0 = last_tunnel_index = p0[0];
                }
              else
                tunnel_index0 = last_tunnel_index;
            }

          t0 = pool_elt_at_index (nngm->tunnels, tunnel_index0);


          sw_if_index0 = t0->sw_if_index;
          len0 = vlib_buffer_length_in_chain (vm, b0);

          /* Required to make the l2 tag push / pop code work on l2 subifs */
          vnet_update_l2_len (b0);

          /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
          vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;

          /*
           * ip[46] lookup in the configured FIB
           */
          vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;

          pkts_decapsulated++;
          stats_n_packets += 1;
          stats_n_bytes += len0;

          /* Batch stats increment on the same vxlan-gpe tunnel so counter
             is not incremented per packet */
          if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
            {
              stats_n_packets -= 1;
              stats_n_bytes -= len0;
              if (stats_n_packets)
                vlib_increment_combined_counter (im->combined_sw_if_counters +
                                                 VNET_INTERFACE_COUNTER_RX,
                                                 thread_index,
                                                 stats_sw_if_index,
                                                 stats_n_packets,
                                                 stats_n_bytes);
              stats_n_packets = 1;
              stats_n_bytes = len0;
              stats_sw_if_index = sw_if_index0;
            }

        trace00:b0->error = error0 ? node->errors[error0] : 0;

          if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              vxlan_gpe_rx_trace_t *tr =
                vlib_add_trace (vm, node, b0, sizeof (*tr));
              tr->next_index = next0;
              tr->error = error0;
              tr->tunnel_index = tunnel_index0;
            }
          vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
                                           n_left_to_next, bi0, next0);
        }

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  vlib_node_increment_counter (vm, vxlan_gpe_input_node.index,
                               VXLAN_GPE_ERROR_DECAPSULATED,
                               pkts_decapsulated);
  /* Increment any remaining batch stats */
  if (stats_n_packets)
    {
      vlib_increment_combined_counter (im->combined_sw_if_counters +
                                       VNET_INTERFACE_COUNTER_RX,
                                       thread_index, stats_sw_if_index,
                                       stats_n_packets, stats_n_bytes);
      node->runtime_data[0] = stats_sw_if_index;
    }
  return from_frame->n_vectors;
}

/**
 * @brief Graph processing dispatch function for IPv4 VXLAN GPE
 *
 * @node vxlan4-gpe-input
 * @param *vm
 * @param *node
 * @param *from_frame
 *
 * @return from_frame->n_vectors
 *
 */
static uword
vxlan4_gpe_input (vlib_main_t * vm, vlib_node_runtime_t * node,
                  vlib_frame_t * from_frame)
{
  return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */ 1);
}


void
vxlan_gpe_register_decap_protocol (u8 protocol_id, uword next_node_index)
{
  vxlan_gpe_main_t *hm = &vxlan_gpe_main;
  hm->decap_next_node_list[protocol_id] = next_node_index;
  return;
}

void
vxlan_gpe_unregister_decap_protocol (u8 protocol_id, uword next_node_index)
{
  vxlan_gpe_main_t *hm = &vxlan_gpe_main;
  hm->decap_next_node_list[protocol_id] = VXLAN_GPE_INPUT_NEXT_DROP;
  return;
}


/**
 * @brief Graph processing dispatch function for IPv6 VXLAN GPE
 *
 * @node vxlan6-gpe-input
 * @param *vm
 * @param *node
 * @param *from_frame
 *
 * @return from_frame->n_vectors - uword
 *
 */
static uword
vxlan6_gpe_input (vlib_main_t * vm, vlib_node_runtime_t * node,
                  vlib_frame_t * from_frame)
{
  return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */ 0);
}

/**
 * @brief VXLAN GPE error strings
 */
static char *vxlan_gpe_error_strings[] = {
#define vxlan_gpe_error(n,s) s,
#include <vnet/vxlan-gpe/vxlan_gpe_error.def>
#undef vxlan_gpe_error
#undef _
};

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vxlan4_gpe_input_node) = {
  .function = vxlan4_gpe_input,
  .name = "vxlan4-gpe-input",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
  .error_strings = vxlan_gpe_error_strings,

  .n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
    foreach_vxlan_gpe_input_next
#undef _
  },

  .format_buffer = format_vxlan_gpe_with_length,
  .format_trace = format_vxlan_gpe_rx_trace,
  // $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
/* *INDENT-ON* */

VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_gpe_input_node, vxlan4_gpe_input);

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vxlan6_gpe_input_node) = {
  .function = vxlan6_gpe_input,
  .name = "vxlan6-gpe-input",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
  .error_strings = vxlan_gpe_error_strings,

  .n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
    foreach_vxlan_gpe_input_next
#undef _
  },

  .format_buffer = format_vxlan_gpe_with_length,
  .format_trace = format_vxlan_gpe_rx_trace,
  // $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
/* *INDENT-ON* */

VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_gpe_input_node, vxlan6_gpe_input);
typedef enum
{
  IP_VXLAN_BYPASS_NEXT_DROP,
  IP_VXLAN_BYPASS_NEXT_VXLAN,
  IP_VXLAN_BYPASS_N_NEXT,
} ip_vxan_bypass_next_t;

always_inline uword
ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
                            vlib_node_runtime_t * node,
                            vlib_frame_t * frame, u32 is_ip4)
{
  vxlan_gpe_main_t *ngm = &vxlan_gpe_main;
  u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip4_input_node.index);
  ip4_address_t addr4;          /* last IPv4 address matching a local VTEP address */
  ip6_address_t addr6;          /* last IPv6 address matching a local VTEP address */

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  if (node->flags & VLIB_NODE_FLAG_TRACE)
    ip4_forward_next_trace (vm, node, frame, VLIB_TX);

  if (is_ip4)
    addr4.data_u32 = ~0;
  else
    ip6_address_set_zero (&addr6);

  while (n_left_from > 0)
    {
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          vlib_buffer_t *b0, *b1;
          ip4_header_t *ip40, *ip41;
          ip6_header_t *ip60, *ip61;
          udp_header_t *udp0, *udp1;
          u32 bi0, ip_len0, udp_len0, flags0, next0;
          u32 bi1, ip_len1, udp_len1, flags1, next1;
          i32 len_diff0, len_diff1;
          u8 error0, good_udp0, proto0;
          u8 error1, good_udp1, proto1;

          /* Prefetch next iteration. */
          {
            vlib_buffer_t *p2, *p3;

            p2 = vlib_get_buffer (vm, from[2]);
            p3 = vlib_get_buffer (vm, from[3]);

            vlib_prefetch_buffer_header (p2, LOAD);
            vlib_prefetch_buffer_header (p3, LOAD);

            CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
            CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
          }

          bi0 = to_next[0] = from[0];
          bi1 = to_next[1] = from[1];
          from += 2;
          n_left_from -= 2;
          to_next += 2;
          n_left_to_next -= 2;

          b0 = vlib_get_buffer (vm, bi0);
          b1 = vlib_get_buffer (vm, bi1);
          if (is_ip4)
            {
              ip40 = vlib_buffer_get_current (b0);
              ip41 = vlib_buffer_get_current (b1);
            }
          else
            {
              ip60 = vlib_buffer_get_current (b0);
              ip61 = vlib_buffer_get_current (b1);
            }

          /* Setup packet for next IP feature */
          vnet_feature_next (&next0, b0);
          vnet_feature_next (&next1, b1);

          if (is_ip4)
            {
              proto0 = ip40->protocol;
              proto1 = ip41->protocol;
            }
          else
            {
              proto0 = ip60->protocol;
              proto1 = ip61->protocol;
            }

          /* Process packet 0 */
          if (proto0 != IP_PROTOCOL_UDP)
            goto exit0;         /* not UDP packet */

          if (is_ip4)
            udp0 = ip4_next_header (ip40);
          else
            udp0 = ip6_next_header (ip60);

          if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
            goto exit0;         /* not VXLAN packet */

          /* Validate DIP against VTEPs */
          if (is_ip4)
            {
              if (addr4.as_u32 != ip40->dst_address.as_u32)
                {
                  if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32))
                    goto exit0; /* no local VTEP for VXLAN packet */
                  addr4 = ip40->dst_address;
                }
            }
          else
            {
              if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
                {
                  if (!hash_get_mem (ngm->vtep6, &ip60->dst_address))
                    goto exit0; /* no local VTEP for VXLAN packet */
                  addr6 = ip60->dst_address;
                }
            }

          flags0 = b0->flags;
          good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

          /* Don't verify UDP checksum for packets with explicit zero checksum. */
          good_udp0 |= udp0->checksum == 0;

          /* Verify UDP length */
          if (is_ip4)
            ip_len0 = clib_net_to_host_u16 (ip40->length);
          else
            ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
          udp_len0 = clib_net_to_host_u16 (udp0->length);
          len_diff0 = ip_len0 - udp_len0;

          /* Verify UDP checksum */
          if (PREDICT_FALSE (!good_udp0))
            {
              if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
                {
                  if (is_ip4)
                    flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
                  else
                    flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
                  good_udp0 =
                    (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
                }
            }

          if (is_ip4)
            {
              error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
              error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
            }
          else
            {
              error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
              error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
            }

          next0 = error0 ?
            IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
          b0->error = error0 ? error_node->errors[error0] : 0;

          /* vxlan_gpe-input node expect current at VXLAN header */
          if (is_ip4)
            vlib_buffer_advance (b0,
                                 sizeof (ip4_header_t) +
                                 sizeof (udp_header_t));
          else
            vlib_buffer_advance (b0,
                                 sizeof (ip6_header_t) +
                                 sizeof (udp_header_t));

        exit0:
          /* Process packet 1 */
          if (proto1 != IP_PROTOCOL_UDP)
            goto exit1;         /* not UDP packet */

          if (is_ip4)
            udp1 = ip4_next_header (ip41);
          else
            udp1 = ip6_next_header (ip61);

          if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
            goto exit1;         /* not VXLAN packet */

          /* Validate DIP against VTEPs */
          if (is_ip4)
            {
              if (addr4.as_u32 != ip41->dst_address.as_u32)
                {
                  if (!hash_get (ngm->vtep4, ip41->dst_address.as_u32))
                    goto exit1; /* no local VTEP for VXLAN packet */
                  addr4 = ip41->dst_address;
                }
            }
          else
            {
              if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
                {
                  if (!hash_get_mem (ngm->vtep6, &ip61->dst_address))
                    goto exit1; /* no local VTEP for VXLAN packet */
                  addr6 = ip61->dst_address;
                }
            }

          flags1 = b1->flags;
          good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

          /* Don't verify UDP checksum for packets with explicit zero checksum. */
          good_udp1 |= udp1->checksum == 0;

          /* Verify UDP length */
          if (is_ip4)
            ip_len1 = clib_net_to_host_u16 (ip41->length);
          else
            ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
          udp_len1 = clib_net_to_host_u16 (udp1->length);
          len_diff1 = ip_len1 - udp_len1;

          /* Verify UDP checksum */
          if (PREDICT_FALSE (!good_udp1))
            {
              if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
                {
                  if (is_ip4)
                    flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
                  else
                    flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
                  good_udp1 =
                    (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
                }
            }

          if (is_ip4)
            {
              error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
              error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
            }
          else
            {
              error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
              error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
            }

          next1 = error1 ?
            IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
          b1->error = error1 ? error_node->errors[error1] : 0;

          /* vxlan_gpe-input node expect current at VXLAN header */
          if (is_ip4)
            vlib_buffer_advance (b1,
                                 sizeof (ip4_header_t) +
                                 sizeof (udp_header_t));
          else
            vlib_buffer_advance (b1,
                                 sizeof (ip6_header_t) +
                                 sizeof (udp_header_t));

        exit1:
          vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                           to_next, n_left_to_next,
                                           bi0, bi1, next0, next1);
        }

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          vlib_buffer_t *b0;
          ip4_header_t *ip40;
          ip6_header_t *ip60;
          udp_header_t *udp0;
          u32 bi0, ip_len0, udp_len0, flags0, next0;
          i32 len_diff0;
          u8 error0, good_udp0, proto0;

          bi0 = to_next[0] = from[0];
          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;

          b0 = vlib_get_buffer (vm, bi0);
          if (is_ip4)
            ip40 = vlib_buffer_get_current (b0);
          else
            ip60 = vlib_buffer_get_current (b0);

          /* Setup packet for next IP feature */
          vnet_feature_next (&next0, b0);

          if (is_ip4)
            proto0 = ip40->protocol;
          else
            proto0 = ip60->protocol;

          if (proto0 != IP_PROTOCOL_UDP)
            goto exit;          /* not UDP packet */

          if (is_ip4)
            udp0 = ip4_next_header (ip40);
          else
            udp0 = ip6_next_header (ip60);

          if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
            goto exit;          /* not VXLAN packet */

          /* Validate DIP against VTEPs */
          if (is_ip4)
            {
              if (addr4.as_u32 != ip40->dst_address.as_u32)
                {
                  if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32))
                    goto exit;  /* no local VTEP for VXLAN packet */
                  addr4 = ip40->dst_address;
                }
            }
          else
            {
              if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
                {
                  if (!hash_get_mem (ngm->vtep6, &ip60->dst_address))
                    goto exit;  /* no local VTEP for VXLAN packet */
                  addr6 = ip60->dst_address;
                }
            }

          flags0 = b0->flags;
          good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

          /* Don't verify UDP checksum for packets with explicit zero checksum. */
          good_udp0 |= udp0->checksum == 0;

          /* Verify UDP length */
          if (is_ip4)
            ip_len0 = clib_net_to_host_u16 (ip40->length);
          else
            ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
          udp_len0 = clib_net_to_host_u16 (udp0->length);
          len_diff0 = ip_len0 - udp_len0;

          /* Verify UDP checksum */
          if (PREDICT_FALSE (!good_udp0))
            {
              if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
                {
                  if (is_ip4)
                    flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
                  else
                    flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
                  good_udp0 =
                    (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
                }
            }

          if (is_ip4)
            {
              error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
              error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
            }
          else
            {
              error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
              error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
            }

          next0 = error0 ?
            IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
          b0->error = error0 ? error_node->errors[error0] : 0;

          /* vxlan_gpe-input node expect current at VXLAN header */
          if (is_ip4)
            vlib_buffer_advance (b0,
                                 sizeof (ip4_header_t) +
                                 sizeof (udp_header_t));
          else
            vlib_buffer_advance (b0,
                                 sizeof (ip6_header_t) +
                                 sizeof (udp_header_t));

        exit:
          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next,
                                           bi0, next0);
        }

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return frame->n_vectors;
}

static uword
ip4_vxlan_gpe_bypass (vlib_main_t * vm,
                      vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_vxlan_gpe_bypass_node) = {
  .function = ip4_vxlan_gpe_bypass,
  .name = "ip4-vxlan-gpe-bypass",
  .vector_size = sizeof (u32),

  .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
  .next_nodes = {
    [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
    [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-gpe-input",
  },

  .format_buffer = format_ip4_header,
  .format_trace = format_ip4_forward_next_trace,
};
/* *INDENT-ON* */

VLIB_NODE_FUNCTION_MULTIARCH (ip4_vxlan_gpe_bypass_node, ip4_vxlan_gpe_bypass)
/* Dummy init function to get us linked in. */
     clib_error_t *ip4_vxlan_gpe_bypass_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (ip4_vxlan_gpe_bypass_init);

static uword
ip6_vxlan_gpe_bypass (vlib_main_t * vm,
                      vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_vxlan_gpe_bypass_node) = {
  .function = ip6_vxlan_gpe_bypass,
  .name = "ip6-vxlan-gpe-bypass",
  .vector_size = sizeof (u32),

  .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
  .next_nodes = {
    [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
    [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-gpe-input",
  },

  .format_buffer = format_ip6_header,
  .format_trace = format_ip6_forward_next_trace,
};
/* *INDENT-ON* */

VLIB_NODE_FUNCTION_MULTIARCH (ip6_vxlan_gpe_bypass_node, ip6_vxlan_gpe_bypass)
/* Dummy init function to get us linked in. */
     clib_error_t *ip6_vxlan_gpe_bypass_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (ip6_vxlan_gpe_bypass_init);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */