ip6_map_t.c

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/*
 * Copyright (c) 2015 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.
 */
#include "map.h"

#include "../ip/ip_frag.h"
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/ip/ip4_to_ip6.h>

#define IP6_MAP_T_DUAL_LOOP

typedef enum
{
  IP6_MAPT_NEXT_MAPT_TCP_UDP,
  IP6_MAPT_NEXT_MAPT_ICMP,
  IP6_MAPT_NEXT_MAPT_FRAGMENTED,
  IP6_MAPT_NEXT_DROP,
  IP6_MAPT_N_NEXT
} ip6_mapt_next_t;

typedef enum
{
  IP6_MAPT_ICMP_NEXT_IP4_LOOKUP,
  IP6_MAPT_ICMP_NEXT_IP4_FRAG,
  IP6_MAPT_ICMP_NEXT_DROP,
  IP6_MAPT_ICMP_N_NEXT
} ip6_mapt_icmp_next_t;

typedef enum
{
  IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP,
  IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG,
  IP6_MAPT_TCP_UDP_NEXT_DROP,
  IP6_MAPT_TCP_UDP_N_NEXT
} ip6_mapt_tcp_udp_next_t;

typedef enum
{
  IP6_MAPT_FRAGMENTED_NEXT_IP4_LOOKUP,
  IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG,
  IP6_MAPT_FRAGMENTED_NEXT_DROP,
  IP6_MAPT_FRAGMENTED_N_NEXT
} ip6_mapt_fragmented_next_t;

static_always_inline int
ip6_map_fragment_cache (ip6_header_t * ip6, ip6_frag_hdr_t * frag,
                        map_domain_t * d, u16 port)
{
  u32 *ignore = NULL;
  map_ip4_reass_lock ();
  map_ip4_reass_t *r = map_ip4_reass_get (map_get_ip4 (&ip6->src_address),
                                          ip6_map_t_embedded_address (d,
                                                                      &ip6->
                                                                      dst_address),
                                          frag_id_6to4 (frag->identification),
                                          (ip6->protocol ==
                                           IP_PROTOCOL_ICMP6) ?
                                          IP_PROTOCOL_ICMP : ip6->protocol,
                                          &ignore);
  if (r)
    r->port = port;

  map_ip4_reass_unlock ();
  return !r;
}

/* Returns the associated port or -1 */
static_always_inline i32
ip6_map_fragment_get (ip6_header_t * ip6, ip6_frag_hdr_t * frag,
                      map_domain_t * d)
{
  u32 *ignore = NULL;
  map_ip4_reass_lock ();
  map_ip4_reass_t *r = map_ip4_reass_get (map_get_ip4 (&ip6->src_address),
                                          ip6_map_t_embedded_address (d,
                                                                      &ip6->
                                                                      dst_address),
                                          frag_id_6to4 (frag->identification),
                                          (ip6->protocol ==
                                           IP_PROTOCOL_ICMP6) ?
                                          IP_PROTOCOL_ICMP : ip6->protocol,
                                          &ignore);
  i32 ret = r ? r->port : -1;
  map_ip4_reass_unlock ();
  return ret;
}

typedef struct
{
  map_domain_t *d;
  u16 sender_port;
} icmp6_to_icmp_ctx_t;

static int
ip6_to_ip4_set_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
{
  icmp6_to_icmp_ctx_t *ctx = arg;
  u32 ip4_sadr;

  //Security check
  //Note that this prevents an intermediate IPv6 router from answering the request
  ip4_sadr = map_get_ip4 (&ip6->src_address);
  if (ip6->src_address.as_u64[0] !=
      map_get_pfx_net (ctx->d, ip4_sadr, ctx->sender_port)
      || ip6->src_address.as_u64[1] != map_get_sfx_net (ctx->d, ip4_sadr,
                                                        ctx->sender_port))
    return -1;

  ip4->dst_address.as_u32 =
    ip6_map_t_embedded_address (ctx->d, &ip6->dst_address);
  ip4->src_address.as_u32 = ip4_sadr;

  return 0;
}

static int
ip6_to_ip4_set_inner_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4,
                              void *arg)
{
  icmp6_to_icmp_ctx_t *ctx = arg;
  u32 inner_ip4_dadr;

  //Security check of inner packet
  inner_ip4_dadr = map_get_ip4 (&ip6->dst_address);
  if (ip6->dst_address.as_u64[0] !=
      map_get_pfx_net (ctx->d, inner_ip4_dadr, ctx->sender_port)
      || ip6->dst_address.as_u64[1] != map_get_sfx_net (ctx->d,
                                                        inner_ip4_dadr,
                                                        ctx->sender_port))
    return -1;

  ip4->dst_address.as_u32 = inner_ip4_dadr;
  ip4->src_address.as_u32 =
    ip6_map_t_embedded_address (ctx->d, &ip6->src_address);

  return 0;
}

static uword
ip6_map_t_icmp (vlib_main_t * vm,
                vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip6_map_t_icmp_node.index);
  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;
  vlib_combined_counter_main_t *cm = map_main.domain_counters;
  u32 thread_index = vlib_get_thread_index ();

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

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 pi0;
          vlib_buffer_t *p0;
          u8 error0;
          ip6_mapt_icmp_next_t next0;
          map_domain_t *d0;
          u16 len0;
          icmp6_to_icmp_ctx_t ctx0;
          ip6_header_t *ip60;

          pi0 = to_next[0] = from[0];
          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;
          error0 = MAP_ERROR_NONE;
          next0 = IP6_MAPT_ICMP_NEXT_IP4_LOOKUP;

          p0 = vlib_get_buffer (vm, pi0);
          ip60 = vlib_buffer_get_current (p0);
          len0 = clib_net_to_host_u16 (ip60->payload_length);
          d0 =
            pool_elt_at_index (map_main.domains,
                               vnet_buffer (p0)->map_t.map_domain_index);
          ctx0.sender_port = ip6_get_port (ip60, 0, p0->current_length);
          ctx0.d = d0;
          if (ctx0.sender_port == 0)
            {
              // In case of 1:1 mapping, we don't care about the port
              if (!(d0->ea_bits_len == 0 && d0->rules))
                {
                  error0 = MAP_ERROR_ICMP;
                  goto err0;
                }
            }

          if (icmp6_to_icmp
              (p0, ip6_to_ip4_set_icmp_cb, &ctx0,
               ip6_to_ip4_set_inner_icmp_cb, &ctx0))
            {
              error0 = MAP_ERROR_ICMP;
              goto err0;
            }

          if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
            {
              //Send to fragmentation node if necessary
              vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
              vnet_buffer (p0)->ip_frag.header_offset = 0;
              vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
              next0 = IP6_MAPT_ICMP_NEXT_IP4_FRAG;
            }
        err0:
          if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
            {
              vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
                                               thread_index,
                                               vnet_buffer (p0)->
                                               map_t.map_domain_index, 1,
                                               len0);
            }
          else
            {
              next0 = IP6_MAPT_ICMP_NEXT_DROP;
            }

          p0->error = error_node->errors[error0];
          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next, pi0,
                                           next0);
        }
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  return frame->n_vectors;
}

static int
ip6_to_ip4_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *ctx)
{
  vlib_buffer_t *p = ctx;

  ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr;
  ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr;

  return 0;
}

static uword
ip6_map_t_fragmented (vlib_main_t * vm,
                      vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip6_map_t_fragmented_node.index);

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

#ifdef IP6_MAP_T_DUAL_LOOP
      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          u32 pi0, pi1;
          vlib_buffer_t *p0, *p1;
          u32 next0, next1;

          pi0 = to_next[0] = from[0];
          pi1 = to_next[1] = from[1];
          from += 2;
          n_left_from -= 2;
          to_next += 2;
          n_left_to_next -= 2;

          next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
          next1 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
          p0 = vlib_get_buffer (vm, pi0);
          p1 = vlib_get_buffer (vm, pi1);

          if (ip6_to_ip4_fragmented (p0, ip6_to_ip4_set_cb, p0))
            {
              p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
              next0 = IP6_MAPT_FRAGMENTED_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
                  vnet_buffer (p0)->ip_frag.header_offset = 0;
                  vnet_buffer (p0)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next0 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
                }
            }

          if (ip6_to_ip4_fragmented (p1, ip6_to_ip4_set_cb, p1))
            {
              p1->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
              next1 = IP6_MAPT_FRAGMENTED_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p1)->map_t.mtu < p1->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p1)->ip_frag.mtu = vnet_buffer (p1)->map_t.mtu;
                  vnet_buffer (p1)->ip_frag.header_offset = 0;
                  vnet_buffer (p1)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next1 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
                }
            }

          vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                           to_next, n_left_to_next, pi0, pi1,
                                           next0, next1);
        }
#endif

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 pi0;
          vlib_buffer_t *p0;
          u32 next0;

          pi0 = to_next[0] = from[0];
          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;

          next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
          p0 = vlib_get_buffer (vm, pi0);

          if (ip6_to_ip4_fragmented (p0, ip6_to_ip4_set_cb, p0))
            {
              p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
              next0 = IP6_MAPT_FRAGMENTED_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
                  vnet_buffer (p0)->ip_frag.header_offset = 0;
                  vnet_buffer (p0)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next0 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
                }
            }

          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next, pi0,
                                           next0);
        }
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  return frame->n_vectors;
}

static uword
ip6_map_t_tcp_udp (vlib_main_t * vm,
                   vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip6_map_t_tcp_udp_node.index);

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;
  while (n_left_from > 0)
    {
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

#ifdef IP6_MAP_T_DUAL_LOOP
      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          u32 pi0, pi1;
          vlib_buffer_t *p0, *p1;
          ip6_mapt_tcp_udp_next_t next0, next1;

          pi0 = to_next[0] = from[0];
          pi1 = to_next[1] = from[1];
          from += 2;
          n_left_from -= 2;
          to_next += 2;
          n_left_to_next -= 2;
          next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;
          next1 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;

          p0 = vlib_get_buffer (vm, pi0);
          p1 = vlib_get_buffer (vm, pi1);

          if (ip6_to_ip4_tcp_udp (p0, ip6_to_ip4_set_cb, p0, 1))
            {
              p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
              next0 = IP6_MAPT_TCP_UDP_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
                  vnet_buffer (p0)->ip_frag.header_offset = 0;
                  vnet_buffer (p0)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
                }
            }

          if (ip6_to_ip4_tcp_udp (p1, ip6_to_ip4_set_cb, p1, 1))
            {
              p1->error = error_node->errors[MAP_ERROR_UNKNOWN];
              next1 = IP6_MAPT_TCP_UDP_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p1)->map_t.mtu < p1->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p1)->ip_frag.mtu = vnet_buffer (p1)->map_t.mtu;
                  vnet_buffer (p1)->ip_frag.header_offset = 0;
                  vnet_buffer (p1)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next1 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
                }
            }

          vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
                                           n_left_to_next, pi0, pi1, next0,
                                           next1);
        }
#endif

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 pi0;
          vlib_buffer_t *p0;
          ip6_mapt_tcp_udp_next_t next0;

          pi0 = to_next[0] = from[0];
          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;
          next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP;

          p0 = vlib_get_buffer (vm, pi0);

          if (ip6_to_ip4_tcp_udp (p0, ip6_to_ip4_set_cb, p0, 1))
            {
              p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
              next0 = IP6_MAPT_TCP_UDP_NEXT_DROP;
            }
          else
            {
              if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
                {
                  //Send to fragmentation node if necessary
                  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
                  vnet_buffer (p0)->ip_frag.header_offset = 0;
                  vnet_buffer (p0)->ip_frag.next_index =
                    IP4_FRAG_NEXT_IP4_LOOKUP;
                  next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
                }
            }

          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next, pi0,
                                           next0);
        }
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  return frame->n_vectors;
}

static_always_inline void
ip6_map_t_classify (vlib_buffer_t * p0, ip6_header_t * ip60,
                    map_domain_t * d0, i32 * src_port0,
                    u8 * error0, ip6_mapt_next_t * next0,
                    u32 l4_len0, ip6_frag_hdr_t * frag0)
{
  if (PREDICT_FALSE (vnet_buffer (p0)->map_t.v6.frag_offset &&
                     ip6_frag_hdr_offset (frag0)))
    {
      *next0 = IP6_MAPT_NEXT_MAPT_FRAGMENTED;
      if (d0->ea_bits_len == 0 && d0->rules)
        {
          *src_port0 = 0;
        }
      else
        {
          *src_port0 = ip6_map_fragment_get (ip60, frag0, d0);
          *error0 = (*src_port0 != -1) ? *error0 : MAP_ERROR_FRAGMENT_DROPPED;
        }
    }
  else
    if (PREDICT_TRUE
        (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_TCP))
    {
      *error0 =
        l4_len0 < sizeof (tcp_header_t) ? MAP_ERROR_MALFORMED : *error0;
      vnet_buffer (p0)->map_t.checksum_offset =
        vnet_buffer (p0)->map_t.v6.l4_offset + 16;
      *next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
      *src_port0 =
        (i32) *
        ((u16 *) u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
    }
  else
    if (PREDICT_TRUE
        (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_UDP))
    {
      *error0 =
        l4_len0 < sizeof (udp_header_t) ? MAP_ERROR_MALFORMED : *error0;
      vnet_buffer (p0)->map_t.checksum_offset =
        vnet_buffer (p0)->map_t.v6.l4_offset + 6;
      *next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
      *src_port0 =
        (i32) *
        ((u16 *) u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
    }
  else if (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_ICMP6)
    {
      *error0 =
        l4_len0 < sizeof (icmp46_header_t) ? MAP_ERROR_MALFORMED : *error0;
      *next0 = IP6_MAPT_NEXT_MAPT_ICMP;
      if (d0->ea_bits_len == 0 && d0->rules)
        {
          *src_port0 = 0;
        }
      else
        if (((icmp46_header_t *)
             u8_ptr_add (ip60,
                         vnet_buffer (p0)->map_t.v6.l4_offset))->code ==
            ICMP6_echo_reply
            || ((icmp46_header_t *)
                u8_ptr_add (ip60,
                            vnet_buffer (p0)->map_t.v6.l4_offset))->code ==
            ICMP6_echo_request)
        {
          *src_port0 =
            (i32) *
            ((u16 *)
             u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset + 6));
        }
    }
  else
    {
      //TODO: In case of 1:1 mapping, it might be possible to do something with those packets.
      *error0 = MAP_ERROR_BAD_PROTOCOL;
    }
}

static uword
ip6_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip6_map_t_node.index);
  vlib_combined_counter_main_t *cm = map_main.domain_counters;
  u32 thread_index = vlib_get_thread_index ();

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;
  while (n_left_from > 0)
    {
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

#ifdef IP6_MAP_T_DUAL_LOOP
      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          u32 pi0, pi1;
          vlib_buffer_t *p0, *p1;
          ip6_header_t *ip60, *ip61;
          u8 error0, error1;
          ip6_mapt_next_t next0, next1;
          u32 l4_len0, l4_len1;
          i32 src_port0, src_port1;
          map_domain_t *d0, *d1;
          ip6_frag_hdr_t *frag0, *frag1;
          u32 saddr0, saddr1;
          next0 = next1 = 0;    //Because compiler whines

          pi0 = to_next[0] = from[0];
          pi1 = to_next[1] = from[1];
          from += 2;
          n_left_from -= 2;
          to_next += 2;
          n_left_to_next -= 2;

          error0 = MAP_ERROR_NONE;
          error1 = MAP_ERROR_NONE;

          p0 = vlib_get_buffer (vm, pi0);
          p1 = vlib_get_buffer (vm, pi1);
          ip60 = vlib_buffer_get_current (p0);
          ip61 = vlib_buffer_get_current (p1);

          saddr0 = map_get_ip4 (&ip60->src_address);
          saddr1 = map_get_ip4 (&ip61->src_address);
          d0 = ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
                                   (ip4_address_t *) & saddr0,
                                   &vnet_buffer (p0)->map_t.map_domain_index,
                                   &error0);
          d1 =
            ip6_map_get_domain (vnet_buffer (p1)->ip.adj_index[VLIB_TX],
                                (ip4_address_t *) & saddr1,
                                &vnet_buffer (p1)->map_t.map_domain_index,
                                &error1);

          vnet_buffer (p0)->map_t.v6.saddr = saddr0;
          vnet_buffer (p1)->map_t.v6.saddr = saddr1;
          vnet_buffer (p0)->map_t.v6.daddr =
            ip6_map_t_embedded_address (d0, &ip60->dst_address);
          vnet_buffer (p1)->map_t.v6.daddr =
            ip6_map_t_embedded_address (d1, &ip61->dst_address);
          vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
          vnet_buffer (p1)->map_t.mtu = d1->mtu ? d1->mtu : ~0;

          if (PREDICT_FALSE (ip6_parse (ip60, p0->current_length,
                                        &(vnet_buffer (p0)->map_t.
                                          v6.l4_protocol),
                                        &(vnet_buffer (p0)->map_t.
                                          v6.l4_offset),
                                        &(vnet_buffer (p0)->map_t.
                                          v6.frag_offset))))
            {
              error0 = MAP_ERROR_MALFORMED;
              next0 = IP6_MAPT_NEXT_DROP;
            }

          if (PREDICT_FALSE (ip6_parse (ip61, p1->current_length,
                                        &(vnet_buffer (p1)->map_t.
                                          v6.l4_protocol),
                                        &(vnet_buffer (p1)->map_t.
                                          v6.l4_offset),
                                        &(vnet_buffer (p1)->map_t.
                                          v6.frag_offset))))
            {
              error1 = MAP_ERROR_MALFORMED;
              next1 = IP6_MAPT_NEXT_DROP;
            }

          src_port0 = src_port1 = -1;
          l4_len0 = (u32) clib_net_to_host_u16 (ip60->payload_length) +
            sizeof (*ip60) - vnet_buffer (p0)->map_t.v6.l4_offset;
          l4_len1 = (u32) clib_net_to_host_u16 (ip61->payload_length) +
            sizeof (*ip60) - vnet_buffer (p1)->map_t.v6.l4_offset;
          frag0 =
            (ip6_frag_hdr_t *) u8_ptr_add (ip60,
                                           vnet_buffer (p0)->map_t.
                                           v6.frag_offset);
          frag1 =
            (ip6_frag_hdr_t *) u8_ptr_add (ip61,
                                           vnet_buffer (p1)->map_t.
                                           v6.frag_offset);

          ip6_map_t_classify (p0, ip60, d0, &src_port0, &error0, &next0,
                              l4_len0, frag0);
          ip6_map_t_classify (p1, ip61, d1, &src_port1, &error1, &next1,
                              l4_len1, frag1);

          if (PREDICT_FALSE
              ((src_port0 != -1)
               && (ip60->src_address.as_u64[0] !=
                   map_get_pfx_net (d0, vnet_buffer (p0)->map_t.v6.saddr,
                                    src_port0)
                   || ip60->src_address.as_u64[1] != map_get_sfx_net (d0,
                                                                      vnet_buffer
                                                                      (p0)->map_t.v6.saddr,
                                                                      src_port0))))
            {
              error0 = MAP_ERROR_SEC_CHECK;
            }

          if (PREDICT_FALSE
              ((src_port1 != -1)
               && (ip61->src_address.as_u64[0] !=
                   map_get_pfx_net (d1, vnet_buffer (p1)->map_t.v6.saddr,
                                    src_port1)
                   || ip61->src_address.as_u64[1] != map_get_sfx_net (d1,
                                                                      vnet_buffer
                                                                      (p1)->map_t.v6.saddr,
                                                                      src_port1))))
            {
              error1 = MAP_ERROR_SEC_CHECK;
            }

          if (PREDICT_FALSE (vnet_buffer (p0)->map_t.v6.frag_offset &&
                             !ip6_frag_hdr_offset ((ip6_frag_hdr_t *)
                                                   u8_ptr_add (ip60,
                                                               vnet_buffer
                                                               (p0)->map_t.
                                                               v6.frag_offset)))
              && (src_port0 != -1) && (d0->ea_bits_len != 0 || !d0->rules)
              && (error0 == MAP_ERROR_NONE))
            {
              ip6_map_fragment_cache (ip60,
                                      (ip6_frag_hdr_t *) u8_ptr_add (ip60,
                                                                     vnet_buffer
                                                                     (p0)->map_t.
                                                                     v6.frag_offset),
                                      d0, src_port0);
            }

          if (PREDICT_FALSE (vnet_buffer (p1)->map_t.v6.frag_offset &&
                             !ip6_frag_hdr_offset ((ip6_frag_hdr_t *)
                                                   u8_ptr_add (ip61,
                                                               vnet_buffer
                                                               (p1)->map_t.
                                                               v6.frag_offset)))
              && (src_port1 != -1) && (d1->ea_bits_len != 0 || !d1->rules)
              && (error1 == MAP_ERROR_NONE))
            {
              ip6_map_fragment_cache (ip61,
                                      (ip6_frag_hdr_t *) u8_ptr_add (ip61,
                                                                     vnet_buffer
                                                                     (p1)->map_t.
                                                                     v6.frag_offset),
                                      d1, src_port1);
            }

          if (PREDICT_TRUE
              (error0 == MAP_ERROR_NONE && next0 != IP6_MAPT_NEXT_MAPT_ICMP))
            {
              vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
                                               thread_index,
                                               vnet_buffer (p0)->
                                               map_t.map_domain_index, 1,
                                               clib_net_to_host_u16
                                               (ip60->payload_length));
            }

          if (PREDICT_TRUE
              (error1 == MAP_ERROR_NONE && next1 != IP6_MAPT_NEXT_MAPT_ICMP))
            {
              vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
                                               thread_index,
                                               vnet_buffer (p1)->
                                               map_t.map_domain_index, 1,
                                               clib_net_to_host_u16
                                               (ip61->payload_length));
            }

          next0 = (error0 != MAP_ERROR_NONE) ? IP6_MAPT_NEXT_DROP : next0;
          next1 = (error1 != MAP_ERROR_NONE) ? IP6_MAPT_NEXT_DROP : next1;
          p0->error = error_node->errors[error0];
          p1->error = error_node->errors[error1];
          vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
                                           n_left_to_next, pi0, pi1, next0,
                                           next1);
        }
#endif

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 pi0;
          vlib_buffer_t *p0;
          ip6_header_t *ip60;
          u8 error0;
          u32 l4_len0;
          i32 src_port0;
          map_domain_t *d0;
          ip6_frag_hdr_t *frag0;
          ip6_mapt_next_t next0 = 0;
          u32 saddr;

          pi0 = to_next[0] = from[0];
          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;
          error0 = MAP_ERROR_NONE;

          p0 = vlib_get_buffer (vm, pi0);
          ip60 = vlib_buffer_get_current (p0);
          //Save saddr in a different variable to not overwrite ip.adj_index
          saddr = map_get_ip4 (&ip60->src_address);
          d0 = ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
                                   (ip4_address_t *) & saddr,
                                   &vnet_buffer (p0)->map_t.map_domain_index,
                                   &error0);

          //FIXME: What if d0 is null
          vnet_buffer (p0)->map_t.v6.saddr = saddr;
          vnet_buffer (p0)->map_t.v6.daddr =
            ip6_map_t_embedded_address (d0, &ip60->dst_address);
          vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;

          if (PREDICT_FALSE (ip6_parse (ip60, p0->current_length,
                                        &(vnet_buffer (p0)->map_t.
                                          v6.l4_protocol),
                                        &(vnet_buffer (p0)->map_t.
                                          v6.l4_offset),
                                        &(vnet_buffer (p0)->map_t.
                                          v6.frag_offset))))
            {
              error0 = MAP_ERROR_MALFORMED;
              next0 = IP6_MAPT_NEXT_DROP;
            }

          src_port0 = -1;
          l4_len0 = (u32) clib_net_to_host_u16 (ip60->payload_length) +
            sizeof (*ip60) - vnet_buffer (p0)->map_t.v6.l4_offset;
          frag0 =
            (ip6_frag_hdr_t *) u8_ptr_add (ip60,
                                           vnet_buffer (p0)->map_t.
                                           v6.frag_offset);


          if (PREDICT_FALSE (vnet_buffer (p0)->map_t.v6.frag_offset &&
                             ip6_frag_hdr_offset (frag0)))
            {
              src_port0 = ip6_map_fragment_get (ip60, frag0, d0);
              error0 = (src_port0 != -1) ? error0 : MAP_ERROR_FRAGMENT_MEMORY;
              next0 = IP6_MAPT_NEXT_MAPT_FRAGMENTED;
            }
          else
            if (PREDICT_TRUE
                (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_TCP))
            {
              error0 =
                l4_len0 <
                sizeof (tcp_header_t) ? MAP_ERROR_MALFORMED : error0;
              vnet_buffer (p0)->map_t.checksum_offset =
                vnet_buffer (p0)->map_t.v6.l4_offset + 16;
              next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
              src_port0 =
                (i32) *
                ((u16 *)
                 u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
            }
          else
            if (PREDICT_TRUE
                (vnet_buffer (p0)->map_t.v6.l4_protocol == IP_PROTOCOL_UDP))
            {
              error0 =
                l4_len0 <
                sizeof (udp_header_t) ? MAP_ERROR_MALFORMED : error0;
              vnet_buffer (p0)->map_t.checksum_offset =
                vnet_buffer (p0)->map_t.v6.l4_offset + 6;
              next0 = IP6_MAPT_NEXT_MAPT_TCP_UDP;
              src_port0 =
                (i32) *
                ((u16 *)
                 u8_ptr_add (ip60, vnet_buffer (p0)->map_t.v6.l4_offset));
            }
          else if (vnet_buffer (p0)->map_t.v6.l4_protocol ==
                   IP_PROTOCOL_ICMP6)
            {
              error0 =
                l4_len0 <
                sizeof (icmp46_header_t) ? MAP_ERROR_MALFORMED : error0;
              next0 = IP6_MAPT_NEXT_MAPT_ICMP;
              if (((icmp46_header_t *)
                   u8_ptr_add (ip60,
                               vnet_buffer (p0)->map_t.v6.l4_offset))->code ==
                  ICMP6_echo_reply
                  || ((icmp46_header_t *)
                      u8_ptr_add (ip60,
                                  vnet_buffer (p0)->map_t.v6.
                                  l4_offset))->code == ICMP6_echo_request)
                src_port0 =
                  (i32) *
                  ((u16 *)
                   u8_ptr_add (ip60,
                               vnet_buffer (p0)->map_t.v6.l4_offset + 6));
            }
          else
            {
              //TODO: In case of 1:1 mapping, it might be possible to do something with those packets.
              error0 = MAP_ERROR_BAD_PROTOCOL;
            }

          //Security check
          if (PREDICT_FALSE
              ((src_port0 != -1)
               && (ip60->src_address.as_u64[0] !=
                   map_get_pfx_net (d0, vnet_buffer (p0)->map_t.v6.saddr,
                                    src_port0)
                   || ip60->src_address.as_u64[1] != map_get_sfx_net (d0,
                                                                      vnet_buffer
                                                                      (p0)->map_t.v6.saddr,
                                                                      src_port0))))
            {
              //Security check when src_port0 is not zero (non-first fragment, UDP or TCP)
              error0 = MAP_ERROR_SEC_CHECK;
            }

          //Fragmented first packet needs to be cached for following packets
          if (PREDICT_FALSE (vnet_buffer (p0)->map_t.v6.frag_offset &&
                             !ip6_frag_hdr_offset ((ip6_frag_hdr_t *)
                                                   u8_ptr_add (ip60,
                                                               vnet_buffer
                                                               (p0)->map_t.
                                                               v6.frag_offset)))
              && (src_port0 != -1) && (d0->ea_bits_len != 0 || !d0->rules)
              && (error0 == MAP_ERROR_NONE))
            {
              ip6_map_fragment_cache (ip60,
                                      (ip6_frag_hdr_t *) u8_ptr_add (ip60,
                                                                     vnet_buffer
                                                                     (p0)->map_t.
                                                                     v6.frag_offset),
                                      d0, src_port0);
            }

          if (PREDICT_TRUE
              (error0 == MAP_ERROR_NONE && next0 != IP6_MAPT_NEXT_MAPT_ICMP))
            {
              vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
                                               thread_index,
                                               vnet_buffer (p0)->
                                               map_t.map_domain_index, 1,
                                               clib_net_to_host_u16
                                               (ip60->payload_length));
            }

          next0 = (error0 != MAP_ERROR_NONE) ? IP6_MAPT_NEXT_DROP : next0;
          p0->error = error_node->errors[error0];
          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next, pi0,
                                           next0);
        }
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  return frame->n_vectors;
}

static char *map_t_error_strings[] = {
#define _(sym,string) string,
  foreach_map_error
#undef _
};

/* *INDENT-OFF* */
VLIB_REGISTER_NODE(ip6_map_t_fragmented_node) = {
  .function = ip6_map_t_fragmented,
  .name = "ip6-map-t-fragmented",
  .vector_size = sizeof (u32),
  .format_trace = format_map_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = MAP_N_ERROR,
  .error_strings = map_t_error_strings,

  .n_next_nodes = IP6_MAPT_FRAGMENTED_N_NEXT,
  .next_nodes = {
      [IP6_MAPT_FRAGMENTED_NEXT_IP4_LOOKUP] = "ip4-lookup",
      [IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
      [IP6_MAPT_FRAGMENTED_NEXT_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_REGISTER_NODE(ip6_map_t_icmp_node) = {
  .function = ip6_map_t_icmp,
  .name = "ip6-map-t-icmp",
  .vector_size = sizeof (u32),
  .format_trace = format_map_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = MAP_N_ERROR,
  .error_strings = map_t_error_strings,

  .n_next_nodes = IP6_MAPT_ICMP_N_NEXT,
  .next_nodes = {
      [IP6_MAPT_ICMP_NEXT_IP4_LOOKUP] = "ip4-lookup",
      [IP6_MAPT_ICMP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
      [IP6_MAPT_ICMP_NEXT_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_REGISTER_NODE(ip6_map_t_tcp_udp_node) = {
  .function = ip6_map_t_tcp_udp,
  .name = "ip6-map-t-tcp-udp",
  .vector_size = sizeof (u32),
  .format_trace = format_map_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = MAP_N_ERROR,
  .error_strings = map_t_error_strings,

  .n_next_nodes = IP6_MAPT_TCP_UDP_N_NEXT,
  .next_nodes = {
      [IP6_MAPT_TCP_UDP_NEXT_IP4_LOOKUP] = "ip4-lookup",
      [IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG] = IP4_FRAG_NODE_NAME,
      [IP6_MAPT_TCP_UDP_NEXT_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_REGISTER_NODE(ip6_map_t_node) = {
  .function = ip6_map_t,
  .name = "ip6-map-t",
  .vector_size = sizeof(u32),
  .format_trace = format_map_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = MAP_N_ERROR,
  .error_strings = map_t_error_strings,

  .n_next_nodes = IP6_MAPT_N_NEXT,
  .next_nodes = {
      [IP6_MAPT_NEXT_MAPT_TCP_UDP] = "ip6-map-t-tcp-udp",
      [IP6_MAPT_NEXT_MAPT_ICMP] = "ip6-map-t-icmp",
      [IP6_MAPT_NEXT_MAPT_FRAGMENTED] = "ip6-map-t-fragmented",
      [IP6_MAPT_NEXT_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

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