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;
 }


 always_inline uword
 ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		       vlib_frame_t * from_frame, int is_ip6)
 {
   ipsec_main_t *im = &ipsec_main;
   vnet_main_t *vnm = im->vnet_main;
   vnet_interface_main_t *vim = &vnm->interface_main;

   int is_trace = node->flags & VLIB_NODE_FLAG_TRACE;
   u32 thread_index = vm->thread_index;

   u32 n_left_from, *from;
   u16 nexts[VLIB_FRAME_SIZE], *next;
   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;

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

   vlib_get_buffers (vm, from, bufs, n_left_from);
   b = bufs;
   next = nexts;

   clib_memset_u16 (nexts, im->esp4_decrypt_next_index, n_left_from);

   u64 n_bytes = 0, n_packets = 0;
   u32 n_disabled = 0, n_no_tunnel = 0;

   u32 last_sw_if_index = ~0;
   u32 last_tunnel_id = ~0;
   ipsec4_tunnel_key_t last_key4;
   ipsec6_tunnel_key_t last_key6;

   vlib_combined_counter_main_t *rx_counter;
   vlib_combined_counter_main_t *drop_counter;

   if (is_ip6)
     clib_memset (&last_key6, 0xff, sizeof (last_key6));
   else
     last_key4.as_u64 = ~0;

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

   while (n_left_from >= 2)
     {
       u32 sw_if_index0, sw_if_index1;
       ip4_header_t *ip40, *ip41;
       ip6_header_t *ip60, *ip61;
       esp_header_t *esp0, *esp1;
       u32 len0, len1;
       u16 buf_adv0, buf_adv1;
       u32 tid0, tid1;
       ipsec_tunnel_if_t *t0, *t1;
       ipsec4_tunnel_key_t key40, key41;
       ipsec6_tunnel_key_t key60, key61;

       if (n_left_from >= 4)
 	{
 	  CLIB_PREFETCH (b[2], CLIB_CACHE_LINE_BYTES, STORE);
 	  CLIB_PREFETCH (b[2]->data, CLIB_CACHE_LINE_BYTES, LOAD);
 	  CLIB_PREFETCH (b[3], CLIB_CACHE_LINE_BYTES, STORE);
 	  CLIB_PREFETCH (b[3]->data, CLIB_CACHE_LINE_BYTES, LOAD);
 	}

       ip40 =
 	(ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset);
       ip41 =
 	(ip4_header_t *) (b[1]->data + vnet_buffer (b[1])->l3_hdr_offset);

       if (is_ip6)
 	{
 	  ip60 = (ip6_header_t *) ip40;
 	  ip61 = (ip6_header_t *) ip41;
 	  esp0 = (esp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t));
 	  esp1 = (esp_header_t *) ((u8 *) ip61 + sizeof (ip6_header_t));
 	  buf_adv0 = sizeof (ip6_header_t);
 	  buf_adv1 = sizeof (ip6_header_t);
 	}
       else
 	{
 	  /* NAT UDP port 4500 case, don't advance any more */
 	  if (ip40->protocol == IP_PROTOCOL_UDP)
 	    {
 	      esp0 =
 		(esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) +
 				  sizeof (udp_header_t));
 	      buf_adv0 = 0;
 	    }
 	  else
 	    {
 	      esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40));
 	      buf_adv0 = ip4_header_bytes (ip40);
 	    }
 	  /* NAT UDP port 4500 case, don't advance any more */
 	  if (ip41->protocol == IP_PROTOCOL_UDP)
 	    {
 	      esp1 =
 		(esp_header_t *) ((u8 *) ip41 + ip4_header_bytes (ip41) +
 				  sizeof (udp_header_t));
 	      buf_adv1 = 0;
 	    }
 	  else
 	    {
 	      esp1 = (esp_header_t *) ((u8 *) ip41 + ip4_header_bytes (ip41));
 	      buf_adv1 = ip4_header_bytes (ip41);
 	    }
 	}

       vlib_buffer_advance (b[0], buf_adv0);
       vlib_buffer_advance (b[1], buf_adv1);

       len0 = vlib_buffer_length_in_chain (vm, b[0]);
       len1 = vlib_buffer_length_in_chain (vm, b[1]);

       if (is_ip6)
 	{
 	  key60.remote_ip = ip60->src_address;
 	  key60.spi = esp0->spi;

 	  if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0)
 	    {
 	      tid0 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60);
 	      if (p)
 		{
 		  tid0 = p[0];
 		  last_tunnel_id = tid0;
 		  clib_memcpy_fast (&last_key6, &key60, sizeof (key60));
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto pkt1;
 		}
 	    }
 	}
       else			/* !is_ip6 */
 	{
 	  key40.remote_ip = ip40->src_address.as_u32;
 	  key40.spi = esp0->spi;

 	  if (key40.as_u64 == last_key4.as_u64)
 	    {
 	      tid0 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64);
 	      if (p)
 		{
 		  tid0 = p[0];
 		  last_tunnel_id = tid0;
 		  last_key4.as_u64 = key40.as_u64;
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto pkt1;
 		}
 	    }
 	}

       t0 = pool_elt_at_index (im->tunnel_interfaces, tid0);
       vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index;

       if (PREDICT_TRUE (t0->hw_if_index != ~0))
 	{
 	  vnet_buffer (b[0])->ipsec.flags = 0;
 	  sw_if_index0 = t0->sw_if_index;
 	  vnet_buffer (b[0])->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);
 	      n_disabled++;
 	      next[0] = IPSEC_INPUT_NEXT_DROP;
 	      goto pkt1;
 	    }

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

 	      last_sw_if_index = sw_if_index0;
 	      n_packets = 1;
 	      n_bytes = len0;
 	    }
 	}
       else
 	{
 	  vnet_buffer (b[0])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 	}

     pkt1:
       if (is_ip6)
 	{
 	  key61.remote_ip = ip61->src_address;
 	  key61.spi = esp1->spi;

 	  if (memcmp (&key61, &last_key6, sizeof (last_key6)) == 0)
 	    {
 	      tid1 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get_mem (im->ipsec6_if_pool_index_by_key, &key61);
 	      if (p)
 		{
 		  tid1 = p[0];
 		  last_tunnel_id = tid1;
 		  clib_memcpy_fast (&last_key6, &key61, sizeof (key61));
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[1] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace1;
 		}
 	    }
 	}
       else			/* !is_ip6 */
 	{
 	  key41.remote_ip = ip41->src_address.as_u32;
 	  key41.spi = esp1->spi;

 	  if (key41.as_u64 == last_key4.as_u64)
 	    {
 	      tid1 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get (im->ipsec4_if_pool_index_by_key, key41.as_u64);
 	      if (p)
 		{
 		  tid1 = p[0];
 		  last_tunnel_id = tid1;
 		  last_key4.as_u64 = key41.as_u64;
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[1] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace1;
 		}
 	    }
 	}

       t1 = pool_elt_at_index (im->tunnel_interfaces, tid1);
       vnet_buffer (b[1])->ipsec.sad_index = t1->input_sa_index;

       if (PREDICT_TRUE (t1->hw_if_index != ~0))
 	{
 	  vnet_buffer (b[1])->ipsec.flags = 0;
 	  sw_if_index1 = t1->sw_if_index;
 	  vnet_buffer (b[1])->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);
 	      n_disabled++;
 	      next[1] = IPSEC_INPUT_NEXT_DROP;
 	      goto trace1;
 	    }

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

 	      last_sw_if_index = sw_if_index1;
 	      n_packets = 1;
 	      n_bytes = len1;
 	    }
 	}
       else
 	{
 	  vnet_buffer (b[1])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 	}

     trace1:
       if (PREDICT_FALSE (is_trace))
 	{
 	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b[0], sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp0->spi);
 	      tr->seq = clib_host_to_net_u32 (esp0->seq);
 	    }
 	  if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b[1], sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp1->spi);
 	      tr->seq = clib_host_to_net_u32 (esp1->seq);
 	    }
 	}

       /* next */
       b += 2;
       next += 2;
       n_left_from -= 2;
     }
   while (n_left_from > 0)
     {
       u32 sw_if_index0;
       ip4_header_t *ip40;
       ip6_header_t *ip60;
       esp_header_t *esp0;
       u32 len0;
       u16 buf_adv0;
       u32 tid0;
       ipsec_tunnel_if_t *t0;
       ipsec4_tunnel_key_t key40;
       ipsec6_tunnel_key_t key60;

       ip40 =
 	(ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset);

       if (is_ip6)
 	{
 	  ip60 = (ip6_header_t *) ip40;
 	  esp0 = (esp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t));
 	  buf_adv0 = sizeof (ip6_header_t);
 	}
       else
 	{
 	  /* NAT UDP port 4500 case, don't advance any more */
 	  if (ip40->protocol == IP_PROTOCOL_UDP)
 	    {
 	      esp0 =
 		(esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) +
 				  sizeof (udp_header_t));
 	      buf_adv0 = 0;
 	    }
 	  else
 	    {
 	      esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40));
 	      buf_adv0 = ip4_header_bytes (ip40);
 	    }
 	}

       /* stats for the tunnel include all the data after the IP header
          just like a norml IP-IP tunnel */
       vlib_buffer_advance (b[0], buf_adv0);
       len0 = vlib_buffer_length_in_chain (vm, b[0]);

       if (is_ip6)
 	{
 	  key60.remote_ip = ip60->src_address;
 	  key60.spi = esp0->spi;

 	  if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0)
 	    {
 	      tid0 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60);
 	      if (p)
 		{
 		  tid0 = p[0];
 		  last_tunnel_id = tid0;
 		  clib_memcpy_fast (&last_key6, &key60, sizeof (key60));
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace00;
 		}
 	    }
 	}
       else			/* !is_ip6 */
 	{
 	  key40.remote_ip = ip40->src_address.as_u32;
 	  key40.spi = esp0->spi;

 	  if (key40.as_u64 == last_key4.as_u64)
 	    {
 	      tid0 = last_tunnel_id;
 	    }
 	  else
 	    {
 	      uword *p =
 		hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64);
 	      if (p)
 		{
 		  tid0 = p[0];
 		  last_tunnel_id = tid0;
 		  last_key4.as_u64 = key40.as_u64;
 		}
 	      else
 		{
 		  n_no_tunnel++;
 		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace00;
 		}
 	    }
 	}

       t0 = pool_elt_at_index (im->tunnel_interfaces, tid0);
       vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index;

       if (PREDICT_TRUE (t0->hw_if_index != ~0))
 	{
 	  vnet_buffer (b[0])->ipsec.flags = 0;
 	  sw_if_index0 = t0->sw_if_index;
 	  vnet_buffer (b[0])->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);
 	      n_disabled++;
 	      next[0] = IPSEC_INPUT_NEXT_DROP;
 	      goto trace00;
 	    }

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

 	      last_sw_if_index = sw_if_index0;
 	      n_packets = 1;
 	      n_bytes = len0;
 	    }
 	}
       else
 	{
 	  vnet_buffer (b[0])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 	}

     trace00:
       if (PREDICT_FALSE (is_trace))
 	{
 	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 	    {
 	      ipsec_if_input_trace_t *tr =
 		vlib_add_trace (vm, node, b[0], sizeof (*tr));
 	      tr->spi = clib_host_to_net_u32 (esp0->spi);
 	      tr->seq = clib_host_to_net_u32 (esp0->seq);
 	    }
 	}

       /* next */
       b += 1;
       next += 1;
       n_left_from -= 1;
     }

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

   vlib_node_increment_counter (vm, node->node_index,
 			       IPSEC_IF_INPUT_ERROR_RX,
 			       from_frame->n_vectors - n_disabled);
   vlib_node_increment_counter (vm, node->node_index,
 			       IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
   vlib_node_increment_counter (vm, node->node_index,
 			       IPSEC_IF_INPUT_ERROR_NO_TUNNEL, n_no_tunnel);

   vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors);

   return from_frame->n_vectors;
 }

 VLIB_NODE_FN (ipsec4_if_input_node) (vlib_main_t * vm,
 				     vlib_node_runtime_t * node,
 				     vlib_frame_t * from_frame)
 {
   return ipsec_if_input_inline (vm, node, from_frame, 0 /* is_ip6 */ );
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ipsec4_if_input_node) = {
   .name = "ipsec4-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* */

 VLIB_NODE_FN (ipsec6_if_input_node) (vlib_main_t * vm,
 				     vlib_node_runtime_t * node,
 				     vlib_frame_t * from_frame)
 {
   return ipsec_if_input_inline (vm, node, from_frame, 1 /* is_ip6 */ );
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ipsec6_if_input_node) = {
   .name = "ipsec6-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 = "ipsec6-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;
	}


	always_inline uword
	ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * from_frame, int is_ip6)
	{
	ipsec_main_t *im = &ipsec_main;
	vnet_main_t *vnm = im->vnet_main;
	vnet_interface_main_t *vim = &vnm->interface_main;

	int is_trace = node->flags & VLIB_NODE_FLAG_TRACE;
	u32 thread_index = vm->thread_index;

	u32 n_left_from, *from;
	u16 nexts[VLIB_FRAME_SIZE], *next;
	vlib_buffer_t bufs[VLIB_FRAME_SIZE], *b;

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

	vlib_get_buffers (vm, from, bufs, n_left_from);
	b = bufs;
	next = nexts;

	clib_memset_u16 (nexts, im->esp4_decrypt_next_index, n_left_from);

	u64 n_bytes = 0, n_packets = 0;
	u32 n_disabled = 0, n_no_tunnel = 0;

	u32 last_sw_if_index = ~0;
	u32 last_tunnel_id = ~0;
	ipsec4_tunnel_key_t last_key4;
	ipsec6_tunnel_key_t last_key6;

	vlib_combined_counter_main_t *rx_counter;
	vlib_combined_counter_main_t *drop_counter;

	if (is_ip6)
	clib_memset (&last_key6, 0xff, sizeof (last_key6));
	else
	last_key4.as_u64 = ~0;

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

	while (n_left_from >= 2)
	{
	u32 sw_if_index0, sw_if_index1;
	ip4_header_t ip40, ip41;
	ip6_header_t ip60, ip61;
	esp_header_t esp0, esp1;
	u32 len0, len1;
	u16 buf_adv0, buf_adv1;
	u32 tid0, tid1;
	ipsec_tunnel_if_t t0, t1;
	ipsec4_tunnel_key_t key40, key41;
	ipsec6_tunnel_key_t key60, key61;

	if (n_left_from >= 4)
	{
	CLIB_PREFETCH (b[2], CLIB_CACHE_LINE_BYTES, STORE);
	CLIB_PREFETCH (b[2]->data, CLIB_CACHE_LINE_BYTES, LOAD);
	CLIB_PREFETCH (b[3], CLIB_CACHE_LINE_BYTES, STORE);
	CLIB_PREFETCH (b[3]->data, CLIB_CACHE_LINE_BYTES, LOAD);
	}

	ip40 =
	(ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset);
	ip41 =
	(ip4_header_t *) (b[1]->data + vnet_buffer (b[1])->l3_hdr_offset);

	if (is_ip6)
	{
	ip60 = (ip6_header_t *) ip40;
	ip61 = (ip6_header_t *) ip41;
	esp0 = (esp_header_t ) ((u8 ) ip60 + sizeof (ip6_header_t));
	esp1 = (esp_header_t ) ((u8 ) ip61 + sizeof (ip6_header_t));
	buf_adv0 = sizeof (ip6_header_t);
	buf_adv1 = sizeof (ip6_header_t);
	}
	else
	{
	/* NAT UDP port 4500 case, don't advance any more */
	if (ip40->protocol == IP_PROTOCOL_UDP)
	{
	esp0 =
	(esp_header_t ) ((u8 ) ip40 + ip4_header_bytes (ip40) +
	sizeof (udp_header_t));
	buf_adv0 = 0;
	}
	else
	{
	esp0 = (esp_header_t ) ((u8 ) ip40 + ip4_header_bytes (ip40));
	buf_adv0 = ip4_header_bytes (ip40);
	}
	/* NAT UDP port 4500 case, don't advance any more */
	if (ip41->protocol == IP_PROTOCOL_UDP)
	{
	esp1 =
	(esp_header_t ) ((u8 ) ip41 + ip4_header_bytes (ip41) +
	sizeof (udp_header_t));
	buf_adv1 = 0;
	}
	else
	{
	esp1 = (esp_header_t ) ((u8 ) ip41 + ip4_header_bytes (ip41));
	buf_adv1 = ip4_header_bytes (ip41);
	}
	}

	vlib_buffer_advance (b[0], buf_adv0);
	vlib_buffer_advance (b[1], buf_adv1);

	len0 = vlib_buffer_length_in_chain (vm, b[0]);
	len1 = vlib_buffer_length_in_chain (vm, b[1]);

	if (is_ip6)
	{
	key60.remote_ip = ip60->src_address;
	key60.spi = esp0->spi;

	if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0)
	{
	tid0 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60);
	if (p)
	{
	tid0 = p[0];
	last_tunnel_id = tid0;
	clib_memcpy_fast (&last_key6, &key60, sizeof (key60));
	}
	else
	{
	n_no_tunnel++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto pkt1;
	}
	}
	}
	else /* !is_ip6 */
	{
	key40.remote_ip = ip40->src_address.as_u32;
	key40.spi = esp0->spi;

	if (key40.as_u64 == last_key4.as_u64)
	{
	tid0 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64);
	if (p)
	{
	tid0 = p[0];
	last_tunnel_id = tid0;
	last_key4.as_u64 = key40.as_u64;
	}
	else
	{
	n_no_tunnel++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto pkt1;
	}
	}
	}

	t0 = pool_elt_at_index (im->tunnel_interfaces, tid0);
	vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index;

	if (PREDICT_TRUE (t0->hw_if_index != ~0))
	{
	vnet_buffer (b[0])->ipsec.flags = 0;
	sw_if_index0 = t0->sw_if_index;
	vnet_buffer (b[0])->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);
	n_disabled++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto pkt1;
	}

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

	last_sw_if_index = sw_if_index0;
	n_packets = 1;
	n_bytes = len0;
	}
	}
	else
	{
	vnet_buffer (b[0])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	pkt1:
	if (is_ip6)
	{
	key61.remote_ip = ip61->src_address;
	key61.spi = esp1->spi;

	if (memcmp (&key61, &last_key6, sizeof (last_key6)) == 0)
	{
	tid1 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get_mem (im->ipsec6_if_pool_index_by_key, &key61);
	if (p)
	{
	tid1 = p[0];
	last_tunnel_id = tid1;
	clib_memcpy_fast (&last_key6, &key61, sizeof (key61));
	}
	else
	{
	n_no_tunnel++;
	next[1] = IPSEC_INPUT_NEXT_DROP;
	goto trace1;
	}
	}
	}
	else /* !is_ip6 */
	{
	key41.remote_ip = ip41->src_address.as_u32;
	key41.spi = esp1->spi;

	if (key41.as_u64 == last_key4.as_u64)
	{
	tid1 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get (im->ipsec4_if_pool_index_by_key, key41.as_u64);
	if (p)
	{
	tid1 = p[0];
	last_tunnel_id = tid1;
	last_key4.as_u64 = key41.as_u64;
	}
	else
	{
	n_no_tunnel++;
	next[1] = IPSEC_INPUT_NEXT_DROP;
	goto trace1;
	}
	}
	}

	t1 = pool_elt_at_index (im->tunnel_interfaces, tid1);
	vnet_buffer (b[1])->ipsec.sad_index = t1->input_sa_index;

	if (PREDICT_TRUE (t1->hw_if_index != ~0))
	{
	vnet_buffer (b[1])->ipsec.flags = 0;
	sw_if_index1 = t1->sw_if_index;
	vnet_buffer (b[1])->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);
	n_disabled++;
	next[1] = IPSEC_INPUT_NEXT_DROP;
	goto trace1;
	}

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

	last_sw_if_index = sw_if_index1;
	n_packets = 1;
	n_bytes = len1;
	}
	}
	else
	{
	vnet_buffer (b[1])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	trace1:
	if (PREDICT_FALSE (is_trace))
	{
	if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b[0], sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	}
	if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b[1], sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp1->spi);
	tr->seq = clib_host_to_net_u32 (esp1->seq);
	}
	}

	/* next */
	b += 2;
	next += 2;
	n_left_from -= 2;
	}
	while (n_left_from > 0)
	{
	u32 sw_if_index0;
	ip4_header_t *ip40;
	ip6_header_t *ip60;
	esp_header_t *esp0;
	u32 len0;
	u16 buf_adv0;
	u32 tid0;
	ipsec_tunnel_if_t *t0;
	ipsec4_tunnel_key_t key40;
	ipsec6_tunnel_key_t key60;

	ip40 =
	(ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset);

	if (is_ip6)
	{
	ip60 = (ip6_header_t *) ip40;
	esp0 = (esp_header_t ) ((u8 ) ip60 + sizeof (ip6_header_t));
	buf_adv0 = sizeof (ip6_header_t);
	}
	else
	{
	/* NAT UDP port 4500 case, don't advance any more */
	if (ip40->protocol == IP_PROTOCOL_UDP)
	{
	esp0 =
	(esp_header_t ) ((u8 ) ip40 + ip4_header_bytes (ip40) +
	sizeof (udp_header_t));
	buf_adv0 = 0;
	}
	else
	{
	esp0 = (esp_header_t ) ((u8 ) ip40 + ip4_header_bytes (ip40));
	buf_adv0 = ip4_header_bytes (ip40);
	}
	}

	/* stats for the tunnel include all the data after the IP header
	just like a norml IP-IP tunnel */
	vlib_buffer_advance (b[0], buf_adv0);
	len0 = vlib_buffer_length_in_chain (vm, b[0]);

	if (is_ip6)
	{
	key60.remote_ip = ip60->src_address;
	key60.spi = esp0->spi;

	if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0)
	{
	tid0 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60);
	if (p)
	{
	tid0 = p[0];
	last_tunnel_id = tid0;
	clib_memcpy_fast (&last_key6, &key60, sizeof (key60));
	}
	else
	{
	n_no_tunnel++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto trace00;
	}
	}
	}
	else /* !is_ip6 */
	{
	key40.remote_ip = ip40->src_address.as_u32;
	key40.spi = esp0->spi;

	if (key40.as_u64 == last_key4.as_u64)
	{
	tid0 = last_tunnel_id;
	}
	else
	{
	uword *p =
	hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64);
	if (p)
	{
	tid0 = p[0];
	last_tunnel_id = tid0;
	last_key4.as_u64 = key40.as_u64;
	}
	else
	{
	n_no_tunnel++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto trace00;
	}
	}
	}

	t0 = pool_elt_at_index (im->tunnel_interfaces, tid0);
	vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index;

	if (PREDICT_TRUE (t0->hw_if_index != ~0))
	{
	vnet_buffer (b[0])->ipsec.flags = 0;
	sw_if_index0 = t0->sw_if_index;
	vnet_buffer (b[0])->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);
	n_disabled++;
	next[0] = IPSEC_INPUT_NEXT_DROP;
	goto trace00;
	}

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

	last_sw_if_index = sw_if_index0;
	n_packets = 1;
	n_bytes = len0;
	}
	}
	else
	{
	vnet_buffer (b[0])->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
	}

	trace00:
	if (PREDICT_FALSE (is_trace))
	{
	if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	{
	ipsec_if_input_trace_t *tr =
	vlib_add_trace (vm, node, b[0], sizeof (*tr));
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	}
	}

	/* next */
	b += 1;
	next += 1;
	n_left_from -= 1;
	}

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

	vlib_node_increment_counter (vm, node->node_index,
	IPSEC_IF_INPUT_ERROR_RX,
	from_frame->n_vectors - n_disabled);
	vlib_node_increment_counter (vm, node->node_index,
	IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
	vlib_node_increment_counter (vm, node->node_index,
	IPSEC_IF_INPUT_ERROR_NO_TUNNEL, n_no_tunnel);

	vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors);

	return from_frame->n_vectors;
	}

	VLIB_NODE_FN (ipsec4_if_input_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	return ipsec_if_input_inline (vm, node, from_frame, 0 /* is_ip6 */ );
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ipsec4_if_input_node) = {
	.name = "ipsec4-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 */

	VLIB_NODE_FN (ipsec6_if_input_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	return ipsec_if_input_inline (vm, node, from_frame, 1 /* is_ip6 */ );
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ipsec6_if_input_node) = {
	.name = "ipsec6-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 = "ipsec6-input-feature",
	};
	/* INDENT-ON */

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