src/vnet/ipsec/ipsec_if_in.c - fdio/vpp - Gitiles

 /*
  * ipsec_if_in.c : IPSec interface input node
  *
  * 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 <vnet/vnet.h>
 #include <vnet/api_errno.h>
 #include <vnet/ip/ip.h>

 #include <vnet/ipsec/ipsec.h>
 #include <vnet/ipsec/esp.h>
 #include <vnet/ipsec/ipsec_io.h>

 /* Statistics (not really errors) */
 #define foreach_ipsec_if_input_error				  \
 _(RX, "good packets received")					  \
 _(DISABLED, "ipsec packets received on disabled interface")       \
 _(NO_TUNNEL, "no matching tunnel")

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

 typedef enum
 {
 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
   foreach_ipsec_if_input_error
 #undef _
     IPSEC_IF_INPUT_N_ERROR,
 } ipsec_if_input_error_t;


 typedef struct
 {
   u32 spi;
   u32 seq;
 } ipsec_if_input_trace_t;

 static u8 *
 format_ipsec_if_input_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 *);
   ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);

   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
   return s;
 }

 VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 				    vlib_node_runtime_t * node,
 				    vlib_frame_t * from_frame)
 {
   ipsec_main_t *im = &ipsec_main;
   vnet_main_t *vnm = im->vnet_main;
   vnet_interface_main_t *vim = &vnm->interface_main;
   u32 *from, *to_next = 0, next_index;
   u32 n_left_from, last_sw_if_index = ~0;
   u32 thread_index = vm->thread_index;
   u64 n_bytes = 0, n_packets = 0;
   const ipsec_tunnel_if_t *last_t = NULL;
   vlib_combined_counter_main_t *rx_counter;
   vlib_combined_counter_main_t *drop_counter;
   u32 n_disabled = 0, n_no_tunnel = 0;

   rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
   drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;

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

   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, next0, next1, sw_if_index0, sw_if_index1;
 	  const esp_header_t *esp0, *esp1;
 	  const ip4_header_t *ip0, *ip1;
 	  vlib_buffer_t *b0, *b1;
 	  uword *p0, *p1;
 	  u32 len0, len1;
 	  u64 key0, key1;

 	  /* 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, STORE);
 	    vlib_prefetch_buffer_header (p3, STORE);

 	    CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
 	    CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
 	  }

 	  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;
 	  next0 = next1 = IPSEC_INPUT_NEXT_DROP;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  b1 = vlib_get_buffer (vm, bi1);
 	  ip0 = vlib_buffer_get_current (b0);
 	  ip1 = vlib_buffer_get_current (b1);
 	  esp0 = (const esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 	  esp1 = (const esp_header_t *) ((u8 *) ip1 + ip4_header_bytes (ip1));

 	  key0 = (u64) ip0->src_address.as_u32 << 32 | (u64) esp0->spi;
 	  key1 = (u64) ip1->src_address.as_u32 << 32 | (u64) esp1->spi;

 	  p0 = hash_get (im->ipsec_if_pool_index_by_key, key0);
 	  p1 = hash_get (im->ipsec_if_pool_index_by_key, key1);

 	  /* stats for the tunnel include all the data after the IP header
 	     just like a norml IP-IP tunnel */
 	  vlib_buffer_advance (b0, ip4_header_bytes (ip0));
 	  vlib_buffer_advance (b1, ip4_header_bytes (ip1));
 	  len0 = vlib_buffer_length_in_chain (vm, b0);
 	  len1 = vlib_buffer_length_in_chain (vm, b1);

 	  if (PREDICT_TRUE (NULL != p0))
 	    {
 	      const ipsec_tunnel_if_t *t0;

 	      t0 = pool_elt_at_index (im->tunnel_interfaces, p0[0]);
 	      vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index;

 	      if (PREDICT_TRUE (t0->hw_if_index != ~0))
 		{
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  sw_if_index0 = t0->sw_if_index;
 		  vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;

 		  if (PREDICT_FALSE
 		      (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
 		    {
 		      vlib_increment_combined_counter
 			(drop_counter, thread_index, sw_if_index0, 1, len0);
 		      b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
 		      n_disabled++;
 		      goto pkt1;
 		    }

 		  if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
 		    {
 		      n_packets++;
 		      n_bytes += len0;
 		    }
 		  else
 		    {
 		      if (last_t)
 			{
 			  vlib_increment_combined_counter
 			    (rx_counter, thread_index, sw_if_index0,
 			     n_packets, n_bytes);
 			}

 		      last_sw_if_index = sw_if_index0;
 		      last_t = t0;
 		      n_packets = 1;
 		      n_bytes = len0;
 		    }
 		}
 	      else
 		{
 		  vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 		}

 	      next0 = im->esp4_decrypt_next_index;
 	    }
 	  else
 	    {
 	      b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
 	      n_no_tunnel++;
 	    }

 	pkt1:
 	  if (PREDICT_TRUE (NULL != p1))
 	    {
 	      const ipsec_tunnel_if_t *t1;

 	      t1 = pool_elt_at_index (im->tunnel_interfaces, p1[0]);
 	      vnet_buffer (b1)->ipsec.sad_index = t1->input_sa_index;

 	      if (PREDICT_TRUE (t1->hw_if_index != ~0))
 		{
 		  vnet_buffer (b1)->ipsec.flags = 0;
 		  sw_if_index1 = t1->sw_if_index;
 		  vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;

 		  if (PREDICT_FALSE
 		      (!(t1->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
 		    {
 		      vlib_increment_combined_counter
 			(drop_counter, thread_index, sw_if_index1, 1, len1);
 		      b1->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
 		      n_disabled++;
 		      goto trace1;
 		    }

 		  if (PREDICT_TRUE (sw_if_index1 == last_sw_if_index))
 		    {
 		      n_packets++;
 		      n_bytes += len1;
 		    }
 		  else
 		    {
 		      if (last_t)
 			{
 			  vlib_increment_combined_counter
 			    (rx_counter, thread_index, sw_if_index1,
 			     n_packets, n_bytes);
 			}

 		      last_sw_if_index = sw_if_index1;
 		      last_t = t1;
 		      n_packets = 1;
 		      n_bytes = len1;
 		    }
 		}
 	      else
 		{
 		  vnet_buffer (b1)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 		}

 	      next1 = im->esp4_decrypt_next_index;
 	    }
 	  else
 	    {
 	      b1->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
 	      n_no_tunnel++;
 	    }

 	trace1:
 	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp0->spi);
 	      tr->seq = clib_host_to_net_u32 (esp0->seq);
 	    }
 	  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b1, sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp1->spi);
 	      tr->seq = clib_host_to_net_u32 (esp1->seq);
 	    }

 	  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, next0, sw_if_index0;
 	  const esp_header_t *esp0;
 	  const ip4_header_t *ip0;
 	  vlib_buffer_t *b0;
 	  uword *p;
 	  u32 len0;

 	  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);
 	  ip0 = vlib_buffer_get_current (b0);
 	  esp0 = (const esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));

 	  next0 = IPSEC_INPUT_NEXT_DROP;

 	  u64 key = (u64) ip0->src_address.as_u32 << 32 | (u64) esp0->spi;

 	  p = hash_get (im->ipsec_if_pool_index_by_key, key);

 	  /* stats for the tunnel include all the data after the IP header
 	     just like a norml IP-IP tunnel */
 	  vlib_buffer_advance (b0, ip4_header_bytes (ip0));
 	  len0 = vlib_buffer_length_in_chain (vm, b0);

 	  if (PREDICT_TRUE (NULL != p))
 	    {
 	      const ipsec_tunnel_if_t *t0;

 	      t0 = pool_elt_at_index (im->tunnel_interfaces, p[0]);
 	      vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index;

 	      if (PREDICT_TRUE (t0->hw_if_index != ~0))
 		{
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  sw_if_index0 = t0->sw_if_index;
 		  vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;

 		  if (PREDICT_FALSE
 		      (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
 		    {
 		      vlib_increment_combined_counter
 			(drop_counter, thread_index, sw_if_index0, 1, len0);
 		      b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
 		      n_disabled++;
 		      goto trace;
 		    }

 		  if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
 		    {
 		      n_packets++;
 		      n_bytes += len0;
 		    }
 		  else
 		    {
 		      if (last_t)
 			{
 			  vlib_increment_combined_counter
 			    (rx_counter, thread_index, sw_if_index0,
 			     n_packets, n_bytes);
 			}

 		      last_sw_if_index = sw_if_index0;
 		      last_t = t0;
 		      n_packets = 1;
 		      n_bytes = len0;
 		    }
 		}
 	      else
 		{
 		  vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 		}

 	      next0 = im->esp4_decrypt_next_index;
 	    }
 	  else
 	    {
 	      b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
 	      n_no_tunnel++;
 	    }

 	trace:
 	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp0->spi);
 	      tr->seq = clib_host_to_net_u32 (esp0->seq);
 	    }

 	  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);
     }

   if (last_t)
     {
       vlib_increment_combined_counter (rx_counter,
 				       thread_index,
 				       last_sw_if_index, n_packets, n_bytes);
     }

   vlib_node_increment_counter (vm, ipsec_if_input_node.index,
 			       IPSEC_IF_INPUT_ERROR_RX,
 			       from_frame->n_vectors - n_disabled);

   vlib_node_increment_counter (vm, ipsec_if_input_node.index,
 			       IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
   vlib_node_increment_counter (vm, ipsec_if_input_node.index,
 			       IPSEC_IF_INPUT_ERROR_DISABLED, n_no_tunnel);

   return from_frame->n_vectors;
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
   .name = "ipsec-if-input",
   .vector_size = sizeof (u32),
   .format_trace = format_ipsec_if_input_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
   .error_strings = ipsec_if_input_error_strings,

   .sibling_of = "ipsec4-input-feature",
 };
 /* *INDENT-ON* */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* ipsec_if_in.c : IPSec interface input node
	*
	* 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 <vnet/vnet.h>
	#include <vnet/api_errno.h>
	#include <vnet/ip/ip.h>

	#include <vnet/ipsec/ipsec.h>
	#include <vnet/ipsec/esp.h>
	#include <vnet/ipsec/ipsec_io.h>

	/* Statistics (not really errors) */
	#define foreach_ipsec_if_input_error \
	_(RX, "good packets received") \
	_(DISABLED, "ipsec packets received on disabled interface") \
	_(NO_TUNNEL, "no matching tunnel")

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

	typedef enum
	{
	#define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
	foreach_ipsec_if_input_error
	#undef _
	IPSEC_IF_INPUT_N_ERROR,
	} ipsec_if_input_error_t;


	typedef struct
	{
	u32 spi;
	u32 seq;
	} ipsec_if_input_trace_t;

	static u8 *
	format_ipsec_if_input_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 );
	ipsec_if_input_trace_t t = va_arg (args, ipsec_if_input_trace_t *);

	s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
	return s;
	}

	VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	ipsec_main_t *im = &ipsec_main;
	vnet_main_t *vnm = im->vnet_main;
	vnet_interface_main_t *vim = &vnm->interface_main;
	u32 from, to_next = 0, next_index;
	u32 n_left_from, last_sw_if_index = ~0;
	u32 thread_index = vm->thread_index;
	u64 n_bytes = 0, n_packets = 0;
	const ipsec_tunnel_if_t *last_t = NULL;
	vlib_combined_counter_main_t *rx_counter;
	vlib_combined_counter_main_t *drop_counter;
	u32 n_disabled = 0, n_no_tunnel = 0;

	rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
	drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;

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

	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, next0, next1, sw_if_index0, sw_if_index1;
	const esp_header_t esp0, esp1;
	const ip4_header_t ip0, ip1;
	vlib_buffer_t b0, b1;
	uword p0, p1;
	u32 len0, len1;
	u64 key0, key1;

	/* 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, STORE);
	vlib_prefetch_buffer_header (p3, STORE);

	CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
	CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
	}

	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;
	next0 = next1 = IPSEC_INPUT_NEXT_DROP;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);
	ip0 = vlib_buffer_get_current (b0);
	ip1 = vlib_buffer_get_current (b1);
	esp0 = (const esp_header_t ) ((u8 ) ip0 + ip4_header_bytes (ip0));
	esp1 = (const esp_header_t ) ((u8 ) ip1 + ip4_header_bytes (ip1));

	key0 = (u64) ip0->src_address.as_u32 << 32 \| (u64) esp0->spi;
	key1 = (u64) ip1->src_address.as_u32 << 32 \| (u64) esp1->spi;

	p0 = hash_get (im->ipsec_if_pool_index_by_key, key0);
	p1 = hash_get (im->ipsec_if_pool_index_by_key, key1);

	/* stats for the tunnel include all the data after the IP header
	just like a norml IP-IP tunnel */
	vlib_buffer_advance (b0, ip4_header_bytes (ip0));
	vlib_buffer_advance (b1, ip4_header_bytes (ip1));
	len0 = vlib_buffer_length_in_chain (vm, b0);
	len1 = vlib_buffer_length_in_chain (vm, b1);

	if (PREDICT_TRUE (NULL != p0))
	{
	const ipsec_tunnel_if_t *t0;

	t0 = pool_elt_at_index (im->tunnel_interfaces, p0[0]);
	vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index;

	if (PREDICT_TRUE (t0->hw_if_index != ~0))
	{
	vnet_buffer (b0)->ipsec.flags = 0;
	sw_if_index0 = t0->sw_if_index;
	vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;

	if (PREDICT_FALSE
	(!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
	{
	vlib_increment_combined_counter
	(drop_counter, thread_index, sw_if_index0, 1, len0);
	b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
	n_disabled++;
	goto pkt1;
	}

	if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
	{
	n_packets++;
	n_bytes += len0;
	}
	else
	{
	if (last_t)
	{
	vlib_increment_combined_counter
	(rx_counter, thread_index, sw_if_index0,
	n_packets, n_bytes);
	}

	last_sw_if_index = sw_if_index0;
	last_t = t0;
	n_packets = 1;
	n_bytes = len0;
	}
	}
	else
	{
	vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	next0 = im->esp4_decrypt_next_index;
	}
	else
	{
	b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
	n_no_tunnel++;
	}

	pkt1:
	if (PREDICT_TRUE (NULL != p1))
	{
	const ipsec_tunnel_if_t *t1;

	t1 = pool_elt_at_index (im->tunnel_interfaces, p1[0]);
	vnet_buffer (b1)->ipsec.sad_index = t1->input_sa_index;

	if (PREDICT_TRUE (t1->hw_if_index != ~0))
	{
	vnet_buffer (b1)->ipsec.flags = 0;
	sw_if_index1 = t1->sw_if_index;
	vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;

	if (PREDICT_FALSE
	(!(t1->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
	{
	vlib_increment_combined_counter
	(drop_counter, thread_index, sw_if_index1, 1, len1);
	b1->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
	n_disabled++;
	goto trace1;
	}

	if (PREDICT_TRUE (sw_if_index1 == last_sw_if_index))
	{
	n_packets++;
	n_bytes += len1;
	}
	else
	{
	if (last_t)
	{
	vlib_increment_combined_counter
	(rx_counter, thread_index, sw_if_index1,
	n_packets, n_bytes);
	}

	last_sw_if_index = sw_if_index1;
	last_t = t1;
	n_packets = 1;
	n_bytes = len1;
	}
	}
	else
	{
	vnet_buffer (b1)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	next1 = im->esp4_decrypt_next_index;
	}
	else
	{
	b1->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
	n_no_tunnel++;
	}

	trace1:
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b0, sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	}
	if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b1, sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp1->spi);
	tr->seq = clib_host_to_net_u32 (esp1->seq);
	}

	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, next0, sw_if_index0;
	const esp_header_t *esp0;
	const ip4_header_t *ip0;
	vlib_buffer_t *b0;
	uword *p;
	u32 len0;

	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);
	ip0 = vlib_buffer_get_current (b0);
	esp0 = (const esp_header_t ) ((u8 ) ip0 + ip4_header_bytes (ip0));

	next0 = IPSEC_INPUT_NEXT_DROP;

	u64 key = (u64) ip0->src_address.as_u32 << 32 \| (u64) esp0->spi;

	p = hash_get (im->ipsec_if_pool_index_by_key, key);

	/* stats for the tunnel include all the data after the IP header
	just like a norml IP-IP tunnel */
	vlib_buffer_advance (b0, ip4_header_bytes (ip0));
	len0 = vlib_buffer_length_in_chain (vm, b0);

	if (PREDICT_TRUE (NULL != p))
	{
	const ipsec_tunnel_if_t *t0;

	t0 = pool_elt_at_index (im->tunnel_interfaces, p[0]);
	vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index;

	if (PREDICT_TRUE (t0->hw_if_index != ~0))
	{
	vnet_buffer (b0)->ipsec.flags = 0;
	sw_if_index0 = t0->sw_if_index;
	vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;

	if (PREDICT_FALSE
	(!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
	{
	vlib_increment_combined_counter
	(drop_counter, thread_index, sw_if_index0, 1, len0);
	b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
	n_disabled++;
	goto trace;
	}

	if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
	{
	n_packets++;
	n_bytes += len0;
	}
	else
	{
	if (last_t)
	{
	vlib_increment_combined_counter
	(rx_counter, thread_index, sw_if_index0,
	n_packets, n_bytes);
	}

	last_sw_if_index = sw_if_index0;
	last_t = t0;
	n_packets = 1;
	n_bytes = len0;
	}
	}
	else
	{
	vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	next0 = im->esp4_decrypt_next_index;
	}
	else
	{
	b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
	n_no_tunnel++;
	}

	trace:
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b0, sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	}

	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);
	}

	if (last_t)
	{
	vlib_increment_combined_counter (rx_counter,
	thread_index,
	last_sw_if_index, n_packets, n_bytes);
	}

	vlib_node_increment_counter (vm, ipsec_if_input_node.index,
	IPSEC_IF_INPUT_ERROR_RX,
	from_frame->n_vectors - n_disabled);

	vlib_node_increment_counter (vm, ipsec_if_input_node.index,
	IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
	vlib_node_increment_counter (vm, ipsec_if_input_node.index,
	IPSEC_IF_INPUT_ERROR_DISABLED, n_no_tunnel);

	return from_frame->n_vectors;
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ipsec_if_input_node) = {
	.name = "ipsec-if-input",
	.vector_size = sizeof (u32),
	.format_trace = format_ipsec_if_input_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
	.error_strings = ipsec_if_input_error_strings,

	.sibling_of = "ipsec4-input-feature",
	};
	/* INDENT-ON */

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