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

 /*
  * decap.c : IPSec tunnel decapsulation
  *
  * 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/feature/feature.h>

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

 #define foreach_ipsec_input_error                   \
  _(RX_PKTS, "IPSEC pkts received")                  \
  _(DECRYPTION_FAILED, "IPSEC decryption failed")

 typedef enum
 {
 #define _(sym,str) IPSEC_INPUT_ERROR_##sym,
   foreach_ipsec_input_error
 #undef _
     IPSEC_INPUT_N_ERROR,
 } ipsec_input_error_t;

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

 typedef struct
 {
   u32 spd;
   u32 sa_id;
   u32 spi;
   u32 seq;
 } ipsec_input_trace_t;

 /* packet trace format function */
 static u8 *
 format_ipsec_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_input_trace_t *t = va_arg (*args, ipsec_input_trace_t *);

   if (t->spi == 0 && t->seq == 0)
     {
       s = format (s, "esp: no esp packet");
       return s;
     }

   if (t->sa_id != 0)
     {
       s =
 	format (s, "esp: sa_id %u spd %u spi %u seq %u", t->sa_id, t->spd,
 		t->spi, t->seq);
     }
   else
     {
       s =
 	format (s, "esp: no sa spd %u spi %u seq %u", t->spd, t->spi, t->seq);
     }
   return s;
 }

 always_inline ipsec_policy_t *
 ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi)
 {
   ipsec_main_t *im = &ipsec_main;
   ipsec_policy_t *p;
   ipsec_sa_t *s;
   u32 *i;

   vec_foreach (i, spd->ipv4_inbound_protect_policy_indices)
   {
     p = pool_elt_at_index (spd->policies, *i);
     s = pool_elt_at_index (im->sad, p->sa_index);

     if (spi != s->spi)
       continue;

     if (s->is_tunnel)
       {
 	if (da != clib_net_to_host_u32 (s->tunnel_dst_addr.ip4.as_u32))
 	  continue;

 	if (sa != clib_net_to_host_u32 (s->tunnel_src_addr.ip4.as_u32))
 	  continue;

 	return p;
       }

     if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
       continue;

     if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
       continue;

     if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
       continue;

     if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
       continue;

     return p;
   }
   return 0;
 }

 always_inline uword
 ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
 		      ip6_address_t * ua)
 {
   if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
       (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
     return 1;
   return 0;
 }

 always_inline ipsec_policy_t *
 ipsec6_input_protect_policy_match (ipsec_spd_t * spd,
 				   ip6_address_t * sa,
 				   ip6_address_t * da, u32 spi)
 {
   ipsec_main_t *im = &ipsec_main;
   ipsec_policy_t *p;
   ipsec_sa_t *s;
   u32 *i;

   vec_foreach (i, spd->ipv6_inbound_protect_policy_indices)
   {
     p = pool_elt_at_index (spd->policies, *i);
     s = pool_elt_at_index (im->sad, p->sa_index);

     if (spi != s->spi)
       continue;

     if (s->is_tunnel)
       {
 	if (!ip6_address_is_equal (sa, &s->tunnel_src_addr.ip6))
 	  continue;

 	if (!ip6_address_is_equal (da, &s->tunnel_dst_addr.ip6))
 	  continue;

 	return p;
       }

     if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6))
       continue;

     if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6))
       continue;

     return p;
   }
   return 0;
 }

 static vlib_node_registration_t ipsec4_input_node;

 VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
   u32 n_left_from, *from, next_index, *to_next;
   ipsec_main_t *im = &ipsec_main;

   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 > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0, next0;
 	  vlib_buffer_t *b0;
 	  ip4_header_t *ip0;
 	  esp_header_t *esp0;
 	  ah_header_t *ah0;
 	  ip4_ipsec_config_t *c0;
 	  ipsec_spd_t *spd0;
 	  ipsec_policy_t *p0 = 0;

 	  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);
 	  b0->flags |= VNET_BUFFER_F_IS_IP4;
 	  b0->flags &= ~VNET_BUFFER_F_IS_IP6;
 	  c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));

 	  spd0 = pool_elt_at_index (im->spds, c0->spd_index);

 	  ip0 = vlib_buffer_get_current (b0);

 	  if (PREDICT_TRUE
 	      (ip0->protocol == IP_PROTOCOL_IPSEC_ESP
 	       || ip0->protocol == IP_PROTOCOL_UDP))
 	    {
 #if 0
 	      clib_warning
 		("packet received from %U to %U spi %u size %u spd_id %u",
 		 format_ip4_address, ip0->src_address.as_u8,
 		 format_ip4_address, ip0->dst_address.as_u8,
 		 clib_net_to_host_u32 (esp0->spi),
 		 clib_net_to_host_u16 (ip0->length), spd0->id);
 #endif

 	      esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 	      if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP))
 		{
 		  esp0 =
 		    (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t));
 		}
 	      /* FIXME TODO missing check whether there is enough data inside
 	       * IP/UDP to contain ESP header & stuff ? */
 	      p0 = ipsec_input_protect_policy_match (spd0,
 						     clib_net_to_host_u32
 						     (ip0->src_address.
 						      as_u32),
 						     clib_net_to_host_u32
 						     (ip0->dst_address.
 						      as_u32),
 						     clib_net_to_host_u32
 						     (esp0->spi));

 	      if (PREDICT_TRUE (p0 != 0))
 		{
 		  p0->counter.packets++;
 		  p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
 		  vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  next0 = im->esp4_decrypt_next_index;
 		  vlib_buffer_advance (b0, ((u8 *) esp0 - (u8 *) ip0));
 		  goto trace0;
 		}

 	      /* FIXME bypass and discard */
 	    trace0:
 	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 		{
 		  ipsec_input_trace_t *tr =
 		    vlib_add_trace (vm, node, b0, sizeof (*tr));
 		  if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP ||
 		      ip0->protocol == IP_PROTOCOL_UDP)
 		    {
 		      if (p0)
 			tr->sa_id = p0->sa_id;
 		      tr->spi = clib_host_to_net_u32 (esp0->spi);
 		      tr->seq = clib_host_to_net_u32 (esp0->seq);
 		      tr->spd = spd0->id;
 		    }
 		}

 	    }


 	  if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_AH))
 	    {
 	      ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 	      p0 = ipsec_input_protect_policy_match (spd0,
 						     clib_net_to_host_u32
 						     (ip0->src_address.
 						      as_u32),
 						     clib_net_to_host_u32
 						     (ip0->dst_address.
 						      as_u32),
 						     clib_net_to_host_u32
 						     (ah0->spi));

 	      if (PREDICT_TRUE (p0 != 0))
 		{
 		  p0->counter.packets++;
 		  p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
 		  vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  next0 = im->ah4_decrypt_next_index;
 		  goto trace1;
 		}
 	      /* FIXME bypass and discard */
 	    trace1:
 	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 		{
 		  ipsec_input_trace_t *tr =
 		    vlib_add_trace (vm, node, b0, sizeof (*tr));
 		  if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
 		    {
 		      if (p0)
 			tr->sa_id = p0->sa_id;
 		      tr->spi = clib_host_to_net_u32 (ah0->spi);
 		      tr->seq = clib_host_to_net_u32 (ah0->seq_no);
 		      tr->spd = spd0->id;
 		    }
 		}
 	    }

 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 					   to_next, n_left_to_next, bi0,
 					   next0);
 	}
       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }
   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 			       IPSEC_INPUT_ERROR_RX_PKTS,
 			       from_frame->n_vectors);

   return from_frame->n_vectors;
 }


 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ipsec4_input_node,static) = {
   .name = "ipsec4-input-feature",
   .vector_size = sizeof (u32),
   .format_trace = format_ipsec_input_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

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

   .n_next_nodes = IPSEC_INPUT_N_NEXT,
   .next_nodes = {
 #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
     foreach_ipsec_input_next
 #undef _
   },
 };
 /* *INDENT-ON* */

 static vlib_node_registration_t ipsec6_input_node;


 VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
   u32 n_left_from, *from, next_index, *to_next;
   ipsec_main_t *im = &ipsec_main;

   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 > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0, next0;
 	  vlib_buffer_t *b0;
 	  ip6_header_t *ip0;
 	  esp_header_t *esp0;
 	  ip4_ipsec_config_t *c0;
 	  ipsec_spd_t *spd0;
 	  ipsec_policy_t *p0 = 0;
 	  ah_header_t *ah0;
 	  u32 header_size = sizeof (ip0[0]);

 	  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);
 	  b0->flags |= VNET_BUFFER_F_IS_IP6;
 	  b0->flags &= ~VNET_BUFFER_F_IS_IP4;
 	  c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));

 	  spd0 = pool_elt_at_index (im->spds, c0->spd_index);

 	  ip0 = vlib_buffer_get_current (b0);
 	  esp0 = (esp_header_t *) ((u8 *) ip0 + header_size);
 	  ah0 = (ah_header_t *) ((u8 *) ip0 + header_size);

 	  if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
 	    {
 #if 0
 	      clib_warning
 		("packet received from %U to %U spi %u size %u spd_id %u",
 		 format_ip6_address, &ip0->src_address, format_ip6_address,
 		 &ip0->dst_address, clib_net_to_host_u32 (esp0->spi),
 		 clib_net_to_host_u16 (ip0->payload_length) + header_size,
 		 spd0->id);
 #endif
 	      p0 = ipsec6_input_protect_policy_match (spd0,
 						      &ip0->src_address,
 						      &ip0->dst_address,
 						      clib_net_to_host_u32
 						      (esp0->spi));

 	      if (PREDICT_TRUE (p0 != 0))
 		{
 		  p0->counter.packets++;
 		  p0->counter.bytes +=
 		    clib_net_to_host_u16 (ip0->payload_length);
 		  p0->counter.bytes += header_size;
 		  vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  next0 = im->esp6_decrypt_next_index;
 		  vlib_buffer_advance (b0, header_size);
 		  goto trace0;
 		}
 	    }
 	  else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
 	    {
 	      p0 = ipsec6_input_protect_policy_match (spd0,
 						      &ip0->src_address,
 						      &ip0->dst_address,
 						      clib_net_to_host_u32
 						      (ah0->spi));

 	      if (PREDICT_TRUE (p0 != 0))
 		{
 		  p0->counter.packets++;
 		  p0->counter.bytes +=
 		    clib_net_to_host_u16 (ip0->payload_length);
 		  p0->counter.bytes += header_size;
 		  vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 		  vnet_buffer (b0)->ipsec.flags = 0;
 		  next0 = im->ah6_decrypt_next_index;
 		  goto trace0;
 		}
 	    }

 	trace0:
 	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      ipsec_input_trace_t *tr =
 		vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
 		{
 		  if (p0)
 		    tr->sa_id = p0->sa_id;
 		  tr->spi = clib_host_to_net_u32 (esp0->spi);
 		  tr->seq = clib_host_to_net_u32 (esp0->seq);
 		  tr->spd = spd0->id;
 		}
 	    }

 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 					   n_left_to_next, bi0, next0);
 	}
       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }
   vlib_node_increment_counter (vm, ipsec6_input_node.index,
 			       IPSEC_INPUT_ERROR_RX_PKTS,
 			       from_frame->n_vectors);

   return from_frame->n_vectors;
 }


 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ipsec6_input_node,static) = {
   .name = "ipsec6-input-feature",
   .vector_size = sizeof (u32),
   .format_trace = format_ipsec_input_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(ipsec_input_error_strings),
   .error_strings = ipsec_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:
  */
	/*
	* decap.c : IPSec tunnel decapsulation
	*
	* 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/feature/feature.h>

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

	#define foreach_ipsec_input_error \
	_(RX_PKTS, "IPSEC pkts received") \
	_(DECRYPTION_FAILED, "IPSEC decryption failed")

	typedef enum
	{
	#define _(sym,str) IPSEC_INPUT_ERROR_##sym,
	foreach_ipsec_input_error
	#undef _
	IPSEC_INPUT_N_ERROR,
	} ipsec_input_error_t;

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

	typedef struct
	{
	u32 spd;
	u32 sa_id;
	u32 spi;
	u32 seq;
	} ipsec_input_trace_t;

	/* packet trace format function */
	static u8 *
	format_ipsec_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_input_trace_t t = va_arg (args, ipsec_input_trace_t *);

	if (t->spi == 0 && t->seq == 0)
	{
	s = format (s, "esp: no esp packet");
	return s;
	}

	if (t->sa_id != 0)
	{
	s =
	format (s, "esp: sa_id %u spd %u spi %u seq %u", t->sa_id, t->spd,
	t->spi, t->seq);
	}
	else
	{
	s =
	format (s, "esp: no sa spd %u spi %u seq %u", t->spd, t->spi, t->seq);
	}
	return s;
	}

	always_inline ipsec_policy_t *
	ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi)
	{
	ipsec_main_t *im = &ipsec_main;
	ipsec_policy_t *p;
	ipsec_sa_t *s;
	u32 *i;

	vec_foreach (i, spd->ipv4_inbound_protect_policy_indices)
	{
	p = pool_elt_at_index (spd->policies, *i);
	s = pool_elt_at_index (im->sad, p->sa_index);

	if (spi != s->spi)
	continue;

	if (s->is_tunnel)
	{
	if (da != clib_net_to_host_u32 (s->tunnel_dst_addr.ip4.as_u32))
	continue;

	if (sa != clib_net_to_host_u32 (s->tunnel_src_addr.ip4.as_u32))
	continue;

	return p;
	}

	if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
	continue;

	if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
	continue;

	if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
	continue;

	if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
	continue;

	return p;
	}
	return 0;
	}

	always_inline uword
	ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
	ip6_address_t * ua)
	{
	if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
	(memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
	return 1;
	return 0;
	}

	always_inline ipsec_policy_t *
	ipsec6_input_protect_policy_match (ipsec_spd_t * spd,
	ip6_address_t * sa,
	ip6_address_t * da, u32 spi)
	{
	ipsec_main_t *im = &ipsec_main;
	ipsec_policy_t *p;
	ipsec_sa_t *s;
	u32 *i;

	vec_foreach (i, spd->ipv6_inbound_protect_policy_indices)
	{
	p = pool_elt_at_index (spd->policies, *i);
	s = pool_elt_at_index (im->sad, p->sa_index);

	if (spi != s->spi)
	continue;

	if (s->is_tunnel)
	{
	if (!ip6_address_is_equal (sa, &s->tunnel_src_addr.ip6))
	continue;

	if (!ip6_address_is_equal (da, &s->tunnel_dst_addr.ip6))
	continue;

	return p;
	}

	if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6))
	continue;

	if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6))
	continue;

	return p;
	}
	return 0;
	}

	static vlib_node_registration_t ipsec4_input_node;

	VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	u32 n_left_from, from, next_index, to_next;
	ipsec_main_t *im = &ipsec_main;

	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 > 0 && n_left_to_next > 0)
	{
	u32 bi0, next0;
	vlib_buffer_t *b0;
	ip4_header_t *ip0;
	esp_header_t *esp0;
	ah_header_t *ah0;
	ip4_ipsec_config_t *c0;
	ipsec_spd_t *spd0;
	ipsec_policy_t *p0 = 0;

	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);
	b0->flags \|= VNET_BUFFER_F_IS_IP4;
	b0->flags &= ~VNET_BUFFER_F_IS_IP6;
	c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));

	spd0 = pool_elt_at_index (im->spds, c0->spd_index);

	ip0 = vlib_buffer_get_current (b0);

	if (PREDICT_TRUE
	(ip0->protocol == IP_PROTOCOL_IPSEC_ESP
	\|\| ip0->protocol == IP_PROTOCOL_UDP))
	{
	#if 0
	clib_warning
	("packet received from %U to %U spi %u size %u spd_id %u",
	format_ip4_address, ip0->src_address.as_u8,
	format_ip4_address, ip0->dst_address.as_u8,
	clib_net_to_host_u32 (esp0->spi),
	clib_net_to_host_u16 (ip0->length), spd0->id);
	#endif

	esp0 = (esp_header_t ) ((u8 ) ip0 + ip4_header_bytes (ip0));
	if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP))
	{
	esp0 =
	(esp_header_t ) ((u8 ) esp0 + sizeof (udp_header_t));
	}
	/* FIXME TODO missing check whether there is enough data inside
	* IP/UDP to contain ESP header & stuff ? */
	p0 = ipsec_input_protect_policy_match (spd0,
	clib_net_to_host_u32
	(ip0->src_address.
	as_u32),
	clib_net_to_host_u32
	(ip0->dst_address.
	as_u32),
	clib_net_to_host_u32
	(esp0->spi));

	if (PREDICT_TRUE (p0 != 0))
	{
	p0->counter.packets++;
	p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
	vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
	vnet_buffer (b0)->ipsec.flags = 0;
	next0 = im->esp4_decrypt_next_index;
	vlib_buffer_advance (b0, ((u8 ) esp0 - (u8 ) ip0));
	goto trace0;
	}

	/* FIXME bypass and discard */
	trace0:
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_input_trace_t *tr =
	vlib_add_trace (vm, node, b0, sizeof (*tr));
	if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP \|\|
	ip0->protocol == IP_PROTOCOL_UDP)
	{
	if (p0)
	tr->sa_id = p0->sa_id;
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	tr->spd = spd0->id;
	}
	}

	}


	if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_AH))
	{
	ah0 = (ah_header_t ) ((u8 ) ip0 + ip4_header_bytes (ip0));
	p0 = ipsec_input_protect_policy_match (spd0,
	clib_net_to_host_u32
	(ip0->src_address.
	as_u32),
	clib_net_to_host_u32
	(ip0->dst_address.
	as_u32),
	clib_net_to_host_u32
	(ah0->spi));

	if (PREDICT_TRUE (p0 != 0))
	{
	p0->counter.packets++;
	p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
	vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
	vnet_buffer (b0)->ipsec.flags = 0;
	next0 = im->ah4_decrypt_next_index;
	goto trace1;
	}
	/* FIXME bypass and discard */
	trace1:
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_input_trace_t *tr =
	vlib_add_trace (vm, node, b0, sizeof (*tr));
	if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
	{
	if (p0)
	tr->sa_id = p0->sa_id;
	tr->spi = clib_host_to_net_u32 (ah0->spi);
	tr->seq = clib_host_to_net_u32 (ah0->seq_no);
	tr->spd = spd0->id;
	}
	}
	}

	vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
	to_next, n_left_to_next, bi0,
	next0);
	}
	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}
	vlib_node_increment_counter (vm, ipsec4_input_node.index,
	IPSEC_INPUT_ERROR_RX_PKTS,
	from_frame->n_vectors);

	return from_frame->n_vectors;
	}


	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ipsec4_input_node,static) = {
	.name = "ipsec4-input-feature",
	.vector_size = sizeof (u32),
	.format_trace = format_ipsec_input_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

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

	.n_next_nodes = IPSEC_INPUT_N_NEXT,
	.next_nodes = {
	#define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
	foreach_ipsec_input_next
	#undef _
	},
	};
	/* INDENT-ON */

	static vlib_node_registration_t ipsec6_input_node;


	VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	u32 n_left_from, from, next_index, to_next;
	ipsec_main_t *im = &ipsec_main;

	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 > 0 && n_left_to_next > 0)
	{
	u32 bi0, next0;
	vlib_buffer_t *b0;
	ip6_header_t *ip0;
	esp_header_t *esp0;
	ip4_ipsec_config_t *c0;
	ipsec_spd_t *spd0;
	ipsec_policy_t *p0 = 0;
	ah_header_t *ah0;
	u32 header_size = sizeof (ip0[0]);

	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);
	b0->flags \|= VNET_BUFFER_F_IS_IP6;
	b0->flags &= ~VNET_BUFFER_F_IS_IP4;
	c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));

	spd0 = pool_elt_at_index (im->spds, c0->spd_index);

	ip0 = vlib_buffer_get_current (b0);
	esp0 = (esp_header_t ) ((u8 ) ip0 + header_size);
	ah0 = (ah_header_t ) ((u8 ) ip0 + header_size);

	if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
	{
	#if 0
	clib_warning
	("packet received from %U to %U spi %u size %u spd_id %u",
	format_ip6_address, &ip0->src_address, format_ip6_address,
	&ip0->dst_address, clib_net_to_host_u32 (esp0->spi),
	clib_net_to_host_u16 (ip0->payload_length) + header_size,
	spd0->id);
	#endif
	p0 = ipsec6_input_protect_policy_match (spd0,
	&ip0->src_address,
	&ip0->dst_address,
	clib_net_to_host_u32
	(esp0->spi));

	if (PREDICT_TRUE (p0 != 0))
	{
	p0->counter.packets++;
	p0->counter.bytes +=
	clib_net_to_host_u16 (ip0->payload_length);
	p0->counter.bytes += header_size;
	vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
	vnet_buffer (b0)->ipsec.flags = 0;
	next0 = im->esp6_decrypt_next_index;
	vlib_buffer_advance (b0, header_size);
	goto trace0;
	}
	}
	else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
	{
	p0 = ipsec6_input_protect_policy_match (spd0,
	&ip0->src_address,
	&ip0->dst_address,
	clib_net_to_host_u32
	(ah0->spi));

	if (PREDICT_TRUE (p0 != 0))
	{
	p0->counter.packets++;
	p0->counter.bytes +=
	clib_net_to_host_u16 (ip0->payload_length);
	p0->counter.bytes += header_size;
	vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
	vnet_buffer (b0)->ipsec.flags = 0;
	next0 = im->ah6_decrypt_next_index;
	goto trace0;
	}
	}

	trace0:
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ipsec_input_trace_t *tr =
	vlib_add_trace (vm, node, b0, sizeof (*tr));
	if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
	{
	if (p0)
	tr->sa_id = p0->sa_id;
	tr->spi = clib_host_to_net_u32 (esp0->spi);
	tr->seq = clib_host_to_net_u32 (esp0->seq);
	tr->spd = spd0->id;
	}
	}

	vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
	n_left_to_next, bi0, next0);
	}
	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}
	vlib_node_increment_counter (vm, ipsec6_input_node.index,
	IPSEC_INPUT_ERROR_RX_PKTS,
	from_frame->n_vectors);

	return from_frame->n_vectors;
	}


	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ipsec6_input_node,static) = {
	.name = "ipsec6-input-feature",
	.vector_size = sizeof (u32),
	.format_trace = format_ipsec_input_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(ipsec_input_error_strings),
	.error_strings = ipsec_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:
	*/