MAP: Move MAP-E/T to a plugin.

Only remaining traces of MAP in the src/vnet is now in buffer.h.
Awaiting a new buffer opaque API (hint, hint).

Change-Id: Ie165561484731f1d7ed6e0f604b43624e06db3f0
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 898 insertions, 0 deletions

diff --git a/src/plugins/map/ip4_map_t.c b/src/plugins/map/ip4_map_t.c
new file mode 100644
index 00000000000..ab4b46c916f
--- /dev/null
+++ b/src/plugins/map/ip4_map_t.c
@@ -0,0 +1,898 @@
+/*
+ * 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 <vnet/ip/ip_frag.h>
+#include <vnet/ip/ip4_to_ip6.h>
+
+#define IP4_MAP_T_DUAL_LOOP 1
+
+typedef enum
+{
+  IP4_MAPT_NEXT_MAPT_TCP_UDP,
+  IP4_MAPT_NEXT_MAPT_ICMP,
+  IP4_MAPT_NEXT_MAPT_FRAGMENTED,
+  IP4_MAPT_NEXT_DROP,
+  IP4_MAPT_N_NEXT
+} ip4_mapt_next_t;
+
+typedef enum
+{
+  IP4_MAPT_ICMP_NEXT_IP6_LOOKUP,
+  IP4_MAPT_ICMP_NEXT_IP6_FRAG,
+  IP4_MAPT_ICMP_NEXT_DROP,
+  IP4_MAPT_ICMP_N_NEXT
+} ip4_mapt_icmp_next_t;
+
+typedef enum
+{
+  IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP,
+  IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG,
+  IP4_MAPT_TCP_UDP_NEXT_DROP,
+  IP4_MAPT_TCP_UDP_N_NEXT
+} ip4_mapt_tcp_udp_next_t;
+
+typedef enum
+{
+  IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP,
+  IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG,
+  IP4_MAPT_FRAGMENTED_NEXT_DROP,
+  IP4_MAPT_FRAGMENTED_N_NEXT
+} ip4_mapt_fragmented_next_t;
+
+//This is used to pass information within the buffer data.
+//Buffer structure being too small to contain big structures like this.
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+  ip6_address_t daddr;
+  ip6_address_t saddr;
+  //IPv6 header + Fragmentation header will be here
+  //sizeof(ip6) + sizeof(ip_frag) - sizeof(ip4)
+  u8 unused[28];
+}) ip4_mapt_pseudo_header_t;
+/* *INDENT-ON* */
+
+
+static_always_inline int
+ip4_map_fragment_cache (ip4_header_t * ip4, u16 port)
+{
+  u32 *ignore = NULL;
+  map_ip4_reass_lock ();
+  map_ip4_reass_t *r =
+    map_ip4_reass_get (ip4->src_address.as_u32, ip4->dst_address.as_u32,
+		       ip4->fragment_id,
+		       (ip4->protocol ==
+			IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip4->protocol,
+		       &ignore);
+  if (r)
+    r->port = port;
+
+  map_ip4_reass_unlock ();
+  return !r;
+}
+
+static_always_inline i32
+ip4_map_fragment_get_port (ip4_header_t * ip4)
+{
+  u32 *ignore = NULL;
+  map_ip4_reass_lock ();
+  map_ip4_reass_t *r =
+    map_ip4_reass_get (ip4->src_address.as_u32, ip4->dst_address.as_u32,
+		       ip4->fragment_id,
+		       (ip4->protocol ==
+			IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip4->protocol,
+		       &ignore);
+  i32 ret = r ? r->port : -1;
+  map_ip4_reass_unlock ();
+  return ret;
+}
+
+typedef struct
+{
+  map_domain_t *d;
+  u16 id;
+} icmp_to_icmp6_ctx_t;
+
+static int
+ip4_to_ip6_set_icmp_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *arg)
+{
+  icmp_to_icmp6_ctx_t *ctx = arg;
+  map_main_t *mm = &map_main;
+
+  if (mm->is_ce)
+    {
+      ip6->src_address.as_u64[0] =
+	map_get_pfx_net (ctx->d, ip4->src_address.as_u32, ctx->id);
+      ip6->src_address.as_u64[1] =
+	map_get_sfx_net (ctx->d, ip4->src_address.as_u32, ctx->id);
+      ip4_map_t_embedded_address (ctx->d, &ip6->dst_address,
+				  &ip4->dst_address);
+    }
+  else
+    {
+      ip4_map_t_embedded_address (ctx->d, &ip6->src_address,
+				  &ip4->src_address);
+      ip6->dst_address.as_u64[0] =
+	map_get_pfx_net (ctx->d, ip4->dst_address.as_u32, ctx->id);
+      ip6->dst_address.as_u64[1] =
+	map_get_sfx_net (ctx->d, ip4->dst_address.as_u32, ctx->id);
+    }
+
+  return 0;
+}
+
+static int
+ip4_to_ip6_set_inner_icmp_cb (ip4_header_t * ip4, ip6_header_t * ip6,
+			      void *arg)
+{
+  icmp_to_icmp6_ctx_t *ctx = arg;
+  map_main_t *mm = &map_main;
+
+  if (mm->is_ce)
+    {
+      //Note that the destination address is within the domain
+      //while the source address is the one outside the domain
+      ip4_map_t_embedded_address (ctx->d, &ip6->src_address,
+				  &ip4->src_address);
+      ip6->dst_address.as_u64[0] =
+	map_get_pfx_net (ctx->d, ip4->dst_address.as_u32, ctx->id);
+      ip6->dst_address.as_u64[1] =
+	map_get_sfx_net (ctx->d, ip4->dst_address.as_u32, ctx->id);
+    }
+  else
+    {
+      //Note that the source address is within the domain
+      //while the destination address is the one outside the domain
+      ip4_map_t_embedded_address (ctx->d, &ip6->dst_address,
+				  &ip4->dst_address);
+      ip6->src_address.as_u64[0] =
+	map_get_pfx_net (ctx->d, ip4->src_address.as_u32, ctx->id);
+      ip6->src_address.as_u64[1] =
+	map_get_sfx_net (ctx->d, ip4->src_address.as_u32, ctx->id);
+    }
+
+  return 0;
+}
+
+static uword
+ip4_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, ip4_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;
+	  ip4_mapt_icmp_next_t next0;
+	  u8 error0;
+	  map_domain_t *d0;
+	  u16 len0;
+	  icmp_to_icmp6_ctx_t ctx0;
+	  ip4_header_t *ip40;
+	  icmp46_header_t *icmp0;
+
+	  next0 = IP4_MAPT_ICMP_NEXT_IP6_LOOKUP;
+	  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);
+	  vlib_buffer_advance (p0, sizeof (ip4_mapt_pseudo_header_t));	//The pseudo-header is not used
+	  len0 =
+	    clib_net_to_host_u16 (((ip4_header_t *)
+				   vlib_buffer_get_current (p0))->length);
+	  d0 =
+	    pool_elt_at_index (map_main.domains,
+			       vnet_buffer (p0)->map_t.map_domain_index);
+
+	  ip40 = vlib_buffer_get_current (p0);
+	  icmp0 = (icmp46_header_t *) (ip40 + 1);
+
+	  ctx0.id = ip4_get_port (ip40, icmp0->type == ICMP6_echo_request);
+	  ctx0.d = d0;
+	  if (ctx0.id == 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 (icmp_to_icmp6
+	      (p0, ip4_to_ip6_set_icmp_cb, &ctx0,
+	       ip4_to_ip6_set_inner_icmp_cb, &ctx0))
+	    {
+	      error0 = MAP_ERROR_ICMP;
+	      goto err0;
+	    }
+
+	  if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
+	    {
+	      vnet_buffer (p0)->ip_frag.header_offset = 0;
+	      vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
+	      vnet_buffer (p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP;
+	      next0 = IP4_MAPT_ICMP_NEXT_IP6_FRAG;
+	    }
+	err0:
+	  if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
+	    {
+	      vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
+					       thread_index,
+					       vnet_buffer (p0)->
+					       map_t.map_domain_index, 1,
+					       len0);
+	    }
+	  else
+	    {
+	      next0 = IP4_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
+ip4_to_ip6_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *ctx)
+{
+  ip4_mapt_pseudo_header_t *pheader = ctx;
+
+  ip6->dst_address.as_u64[0] = pheader->daddr.as_u64[0];
+  ip6->dst_address.as_u64[1] = pheader->daddr.as_u64[1];
+  ip6->src_address.as_u64[0] = pheader->saddr.as_u64[0];
+  ip6->src_address.as_u64[1] = pheader->saddr.as_u64[1];
+
+  return 0;
+}
+
+static uword
+ip4_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, ip4_map_t_fragmented_node.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;
+	  ip4_mapt_pseudo_header_t *pheader0;
+	  ip4_mapt_fragmented_next_t next0;
+
+	  next0 = IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP;
+	  pi0 = to_next[0] = from[0];
+	  from += 1;
+	  n_left_from -= 1;
+	  to_next += 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, pi0);
+
+	  //Accessing pseudo header
+	  pheader0 = vlib_buffer_get_current (p0);
+	  vlib_buffer_advance (p0, sizeof (*pheader0));
+
+	  if (ip4_to_ip6_fragmented (p0, ip4_to_ip6_set_cb, pheader0))
+	    {
+	      p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
+	      next0 = IP4_MAPT_FRAGMENTED_NEXT_DROP;
+	    }
+	  else
+	    {
+	      if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
+		{
+		  vnet_buffer (p0)->ip_frag.header_offset = 0;
+		  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
+		  vnet_buffer (p0)->ip_frag.next_index =
+		    IP6_FRAG_NEXT_IP6_LOOKUP;
+		  next0 = IP4_MAPT_FRAGMENTED_NEXT_IP6_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
+ip4_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;
+  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, ip4_map_t_tcp_udp_node.index);
+
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+#ifdef IP4_MAP_T_DUAL_LOOP
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+	  u32 pi0, pi1;
+	  vlib_buffer_t *p0, *p1;
+	  ip4_mapt_pseudo_header_t *pheader0, *pheader1;
+	  ip4_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 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP;
+	  next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP;
+	  p0 = vlib_get_buffer (vm, pi0);
+	  p1 = vlib_get_buffer (vm, pi1);
+
+	  //Accessing pseudo header
+	  pheader0 = vlib_buffer_get_current (p0);
+	  pheader1 = vlib_buffer_get_current (p1);
+	  vlib_buffer_advance (p0, sizeof (*pheader0));
+	  vlib_buffer_advance (p1, sizeof (*pheader1));
+
+	  if (ip4_to_ip6_tcp_udp (p0, ip4_to_ip6_set_cb, pheader0))
+	    {
+	      p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
+	      next0 = IP4_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.header_offset = 0;
+		  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
+		  vnet_buffer (p0)->ip_frag.next_index =
+		    IP6_FRAG_NEXT_IP6_LOOKUP;
+		  next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG;
+		}
+	    }
+
+	  if (ip4_to_ip6_tcp_udp (p1, ip4_to_ip6_set_cb, pheader1))
+	    {
+	      p1->error = error_node->errors[MAP_ERROR_UNKNOWN];
+	      next1 = IP4_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.header_offset = 0;
+		  vnet_buffer (p1)->ip_frag.mtu = vnet_buffer (p1)->map_t.mtu;
+		  vnet_buffer (p1)->ip_frag.next_index =
+		    IP6_FRAG_NEXT_IP6_LOOKUP;
+		  next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_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;
+	  ip4_mapt_pseudo_header_t *pheader0;
+	  ip4_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 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP;
+	  p0 = vlib_get_buffer (vm, pi0);
+
+	  //Accessing pseudo header
+	  pheader0 = vlib_buffer_get_current (p0);
+	  vlib_buffer_advance (p0, sizeof (*pheader0));
+
+	  if (ip4_to_ip6_tcp_udp (p0, ip4_to_ip6_set_cb, pheader0))
+	    {
+	      p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
+	      next0 = IP4_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.header_offset = 0;
+		  vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
+		  vnet_buffer (p0)->ip_frag.next_index =
+		    IP6_FRAG_NEXT_IP6_LOOKUP;
+		  next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_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
+ip4_map_t_classify (vlib_buffer_t * p0, map_domain_t * d0,
+		    ip4_header_t * ip40, u16 ip4_len0, i32 * dst_port0,
+		    u8 * error0, ip4_mapt_next_t * next0)
+{
+  map_main_t *mm = &map_main;
+  u32 port_offset;
+
+  if (mm->is_ce)
+    port_offset = 0;
+  else
+    port_offset = 2;
+
+  if (PREDICT_FALSE (ip4_get_fragment_offset (ip40)))
+    {
+      *next0 = IP4_MAPT_NEXT_MAPT_FRAGMENTED;
+      if (d0->ea_bits_len == 0 && d0->rules)
+	{
+	  *dst_port0 = 0;
+	}
+      else
+	{
+	  *dst_port0 = ip4_map_fragment_get_port (ip40);
+	  *error0 = (*dst_port0 == -1) ? MAP_ERROR_FRAGMENT_MEMORY : *error0;
+	}
+    }
+  else if (PREDICT_TRUE (ip40->protocol == IP_PROTOCOL_TCP))
+    {
+      vnet_buffer (p0)->map_t.checksum_offset = 36;
+      *next0 = IP4_MAPT_NEXT_MAPT_TCP_UDP;
+      *error0 = ip4_len0 < 40 ? MAP_ERROR_MALFORMED : *error0;
+      *dst_port0 =
+	(i32) * ((u16 *) u8_ptr_add (ip40, sizeof (*ip40) + port_offset));
+    }
+  else if (PREDICT_TRUE (ip40->protocol == IP_PROTOCOL_UDP))
+    {
+      vnet_buffer (p0)->map_t.checksum_offset = 26;
+      *next0 = IP4_MAPT_NEXT_MAPT_TCP_UDP;
+      *error0 = ip4_len0 < 28 ? MAP_ERROR_MALFORMED : *error0;
+      *dst_port0 =
+	(i32) * ((u16 *) u8_ptr_add (ip40, sizeof (*ip40) + port_offset));
+    }
+  else if (ip40->protocol == IP_PROTOCOL_ICMP)
+    {
+      *next0 = IP4_MAPT_NEXT_MAPT_ICMP;
+      if (d0->ea_bits_len == 0 && d0->rules)
+	*dst_port0 = 0;
+      else if (((icmp46_header_t *) u8_ptr_add (ip40, sizeof (*ip40)))->code
+	       == ICMP4_echo_reply
+	       || ((icmp46_header_t *)
+		   u8_ptr_add (ip40,
+			       sizeof (*ip40)))->code == ICMP4_echo_request)
+	*dst_port0 = (i32) * ((u16 *) u8_ptr_add (ip40, sizeof (*ip40) + 6));
+    }
+  else
+    {
+      *error0 = MAP_ERROR_BAD_PROTOCOL;
+    }
+}
+
+static uword
+ip4_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, ip4_map_t_node.index);
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+  map_main_t *mm = &map_main;
+  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);
+
+#ifdef IP4_MAP_T_DUAL_LOOP
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+	  u32 pi0, pi1;
+	  vlib_buffer_t *p0, *p1;
+	  ip4_header_t *ip40, *ip41;
+	  map_domain_t *d0, *d1;
+	  ip4_mapt_next_t next0 = 0, next1 = 0;
+	  u16 ip4_len0, ip4_len1;
+	  u8 error0, error1;
+	  i32 map_port0, map_port1;
+	  ip4_mapt_pseudo_header_t *pheader0, *pheader1;
+
+	  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);
+	  ip40 = vlib_buffer_get_current (p0);
+	  ip41 = vlib_buffer_get_current (p1);
+	  ip4_len0 = clib_host_to_net_u16 (ip40->length);
+	  ip4_len1 = clib_host_to_net_u16 (ip41->length);
+
+	  if (PREDICT_FALSE (p0->current_length < ip4_len0 ||
+			     ip40->ip_version_and_header_length != 0x45))
+	    {
+	      error0 = MAP_ERROR_UNKNOWN;
+	      next0 = IP4_MAPT_NEXT_DROP;
+	    }
+
+	  if (PREDICT_FALSE (p1->current_length < ip4_len1 ||
+			     ip41->ip_version_and_header_length != 0x45))
+	    {
+	      error1 = MAP_ERROR_UNKNOWN;
+	      next1 = IP4_MAPT_NEXT_DROP;
+	    }
+
+	  vnet_buffer (p0)->map_t.map_domain_index =
+	    vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+	  d0 = ip4_map_get_domain (vnet_buffer (p0)->map_t.map_domain_index);
+	  vnet_buffer (p1)->map_t.map_domain_index =
+	    vnet_buffer (p1)->ip.adj_index[VLIB_TX];
+	  d1 = ip4_map_get_domain (vnet_buffer (p1)->map_t.map_domain_index);
+
+	  vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
+	  vnet_buffer (p1)->map_t.mtu = d1->mtu ? d1->mtu : ~0;
+
+	  map_port0 = -1;
+	  map_port1 = -1;
+
+	  ip4_map_t_classify (p0, d0, ip40, ip4_len0, &map_port0, &error0,
+			      &next0);
+	  ip4_map_t_classify (p1, d1, ip41, ip4_len1, &map_port1, &error1,
+			      &next1);
+
+	  //Add MAP-T pseudo header in front of the packet
+	  vlib_buffer_advance (p0, -sizeof (*pheader0));
+	  vlib_buffer_advance (p1, -sizeof (*pheader1));
+	  pheader0 = vlib_buffer_get_current (p0);
+	  pheader1 = vlib_buffer_get_current (p1);
+
+	  //Save addresses within the packet
+	  if (mm->is_ce)
+	    {
+	      ip4_map_t_embedded_address (d0, &pheader0->daddr,
+					  &ip40->dst_address);
+	      ip4_map_t_embedded_address (d1, &pheader1->daddr,
+					  &ip41->dst_address);
+	      pheader0->saddr.as_u64[0] =
+		map_get_pfx_net (d0, ip40->src_address.as_u32,
+				 (u16) map_port0);
+	      pheader0->saddr.as_u64[1] =
+		map_get_sfx_net (d0, ip40->src_address.as_u32,
+				 (u16) map_port0);
+	      pheader1->saddr.as_u64[0] =
+		map_get_pfx_net (d1, ip41->src_address.as_u32,
+				 (u16) map_port1);
+	      pheader1->saddr.as_u64[1] =
+		map_get_sfx_net (d1, ip41->src_address.as_u32,
+				 (u16) map_port1);
+	    }
+	  else
+	    {
+	      ip4_map_t_embedded_address (d0, &pheader0->saddr,
+					  &ip40->src_address);
+	      ip4_map_t_embedded_address (d1, &pheader1->saddr,
+					  &ip41->src_address);
+	      pheader0->daddr.as_u64[0] =
+		map_get_pfx_net (d0, ip40->dst_address.as_u32,
+				 (u16) map_port0);
+	      pheader0->daddr.as_u64[1] =
+		map_get_sfx_net (d0, ip40->dst_address.as_u32,
+				 (u16) map_port0);
+	      pheader1->daddr.as_u64[0] =
+		map_get_pfx_net (d1, ip41->dst_address.as_u32,
+				 (u16) map_port1);
+	      pheader1->daddr.as_u64[1] =
+		map_get_sfx_net (d1, ip41->dst_address.as_u32,
+				 (u16) map_port1);
+	    }
+
+	  if (PREDICT_FALSE
+	      (ip4_is_first_fragment (ip40) && (map_port0 != -1)
+	       && (d0->ea_bits_len != 0 || !d0->rules)
+	       && ip4_map_fragment_cache (ip40, map_port0)))
+	    {
+	      error0 = MAP_ERROR_FRAGMENT_MEMORY;
+	    }
+
+	  if (PREDICT_FALSE
+	      (ip4_is_first_fragment (ip41) && (map_port1 != -1)
+	       && (d1->ea_bits_len != 0 || !d1->rules)
+	       && ip4_map_fragment_cache (ip41, map_port1)))
+	    {
+	      error1 = MAP_ERROR_FRAGMENT_MEMORY;
+	    }
+
+	  if (PREDICT_TRUE
+	      (error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP))
+	    {
+	      vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
+					       thread_index,
+					       vnet_buffer (p0)->
+					       map_t.map_domain_index, 1,
+					       clib_net_to_host_u16
+					       (ip40->length));
+	    }
+
+	  if (PREDICT_TRUE
+	      (error1 == MAP_ERROR_NONE && next1 != IP4_MAPT_NEXT_MAPT_ICMP))
+	    {
+	      vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
+					       thread_index,
+					       vnet_buffer (p1)->
+					       map_t.map_domain_index, 1,
+					       clib_net_to_host_u16
+					       (ip41->length));
+	    }
+
+	  next0 = (error0 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next0;
+	  next1 = (error1 != MAP_ERROR_NONE) ? IP4_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;
+	  ip4_header_t *ip40;
+	  map_domain_t *d0;
+	  ip4_mapt_next_t next0;
+	  u16 ip4_len0;
+	  u8 error0;
+	  i32 map_port0;
+	  ip4_mapt_pseudo_header_t *pheader0;
+
+	  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);
+	  ip40 = vlib_buffer_get_current (p0);
+	  ip4_len0 = clib_host_to_net_u16 (ip40->length);
+	  if (PREDICT_FALSE (p0->current_length < ip4_len0 ||
+			     ip40->ip_version_and_header_length != 0x45))
+	    {
+	      error0 = MAP_ERROR_UNKNOWN;
+	      next0 = IP4_MAPT_NEXT_DROP;
+	    }
+
+	  vnet_buffer (p0)->map_t.map_domain_index =
+	    vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+	  d0 = ip4_map_get_domain (vnet_buffer (p0)->map_t.map_domain_index);
+
+	  vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
+
+	  map_port0 = -1;
+	  ip4_map_t_classify (p0, d0, ip40, ip4_len0, &map_port0, &error0,
+			      &next0);
+
+	  //Add MAP-T pseudo header in front of the packet
+	  vlib_buffer_advance (p0, -sizeof (*pheader0));
+	  pheader0 = vlib_buffer_get_current (p0);
+
+	  //Save addresses within the packet
+	  if (mm->is_ce)
+	    {
+	      ip4_map_t_embedded_address (d0, &pheader0->daddr,
+					  &ip40->dst_address);
+	      pheader0->saddr.as_u64[0] =
+		map_get_pfx_net (d0, ip40->src_address.as_u32,
+				 (u16) map_port0);
+	      pheader0->saddr.as_u64[1] =
+		map_get_sfx_net (d0, ip40->src_address.as_u32,
+				 (u16) map_port0);
+	    }
+	  else
+	    {
+	      ip4_map_t_embedded_address (d0, &pheader0->saddr,
+					  &ip40->src_address);
+	      pheader0->daddr.as_u64[0] =
+		map_get_pfx_net (d0, ip40->dst_address.as_u32,
+				 (u16) map_port0);
+	      pheader0->daddr.as_u64[1] =
+		map_get_sfx_net (d0, ip40->dst_address.as_u32,
+				 (u16) map_port0);
+	    }
+
+	  //It is important to cache at this stage because the result might be necessary
+	  //for packets within the same vector.
+	  //Actually, this approach even provides some limited out-of-order fragments support
+	  if (PREDICT_FALSE
+	      (ip4_is_first_fragment (ip40) && (map_port0 != -1)
+	       && (d0->ea_bits_len != 0 || !d0->rules)
+	       && ip4_map_fragment_cache (ip40, map_port0)))
+	    {
+	      error0 = MAP_ERROR_UNKNOWN;
+	    }
+
+	  if (PREDICT_TRUE
+	      (error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP))
+	    {
+	      vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
+					       thread_index,
+					       vnet_buffer (p0)->
+					       map_t.map_domain_index, 1,
+					       clib_net_to_host_u16
+					       (ip40->length));
+	    }
+
+	  next0 = (error0 != MAP_ERROR_NONE) ? IP4_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(ip4_map_t_fragmented_node) = {
+  .function = ip4_map_t_fragmented,
+  .name = "ip4-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 = IP4_MAPT_FRAGMENTED_N_NEXT,
+  .next_nodes = {
+      [IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP] = "ip6-lookup",
+      [IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME,
+      [IP4_MAPT_FRAGMENTED_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE(ip4_map_t_icmp_node) = {
+  .function = ip4_map_t_icmp,
+  .name = "ip4-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 = IP4_MAPT_ICMP_N_NEXT,
+  .next_nodes = {
+      [IP4_MAPT_ICMP_NEXT_IP6_LOOKUP] = "ip6-lookup",
+      [IP4_MAPT_ICMP_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME,
+      [IP4_MAPT_ICMP_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE(ip4_map_t_tcp_udp_node) = {
+  .function = ip4_map_t_tcp_udp,
+  .name = "ip4-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 = IP4_MAPT_TCP_UDP_N_NEXT,
+  .next_nodes = {
+      [IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP] = "ip6-lookup",
+      [IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME,
+      [IP4_MAPT_TCP_UDP_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE(ip4_map_t_node) = {
+  .function = ip4_map_t,
+  .name = "ip4-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 = IP4_MAPT_N_NEXT,
+  .next_nodes = {
+      [IP4_MAPT_NEXT_MAPT_TCP_UDP] = "ip4-map-t-tcp-udp",
+      [IP4_MAPT_NEXT_MAPT_ICMP] = "ip4-map-t-icmp",
+      [IP4_MAPT_NEXT_MAPT_FRAGMENTED] = "ip4-map-t-fragmented",
+      [IP4_MAPT_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */