src/vnet/ip/ip_punt_drop.h - fdio/vpp - Gitiles

 /*
  * 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.
  */

 #ifndef __IP_PUNT_DROP_H__
 #define __IP_PUNT_DROP_H__

 #include <vnet/ip/ip.h>
 #include <vnet/policer/policer.h>
 #include <vnet/policer/police_inlines.h>

 /**
  * IP4 punt policer configuration
  *   we police the punt rate to prevent overloading the host
  */
 typedef struct ip_punt_policer_t_
 {
   u32 policer_index;
   u32 fq_index;
 } ip_punt_policer_t;

 typedef enum ip_punt_policer_next_t_
 {
   IP_PUNT_POLICER_NEXT_DROP,
   IP_PUNT_POLICER_NEXT_HANDOFF,
   IP_PUNT_POLICER_N_NEXT,
 } ip_punt_policer_next_t;

 typedef struct ip_punt_policer_trace_t_
 {
   u32 policer_index;
   u32 next;
 } ip_punt_policer_trace_t;

 #define foreach_ip_punt_policer_error          \
 _(DROP, "ip punt policer drop")

 typedef enum
 {
 #define _(sym,str) IP_PUNT_POLICER_ERROR_##sym,
   foreach_ip_punt_policer_error
 #undef _
     IP4_PUNT_POLICER_N_ERROR,
 } ip_punt_policer_error_t;

 extern u8 *format_ip_punt_policer_trace (u8 * s, va_list * args);
 extern vlib_node_registration_t ip4_punt_policer_node;
 extern ip_punt_policer_t ip4_punt_policer_cfg;
 extern vlib_node_registration_t ip6_punt_policer_node;
 extern ip_punt_policer_t ip6_punt_policer_cfg;

 /**
  * IP punt policing node function
  */
 always_inline uword
 ip_punt_policer (vlib_main_t * vm,
 		 vlib_node_runtime_t * node,
 		 vlib_frame_t * frame, u8 arc_index, u32 policer_index)
 {
   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
   u64 time_in_policer_periods;
   vnet_feature_main_t *fm = &feature_main;
   vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_index];

   time_in_policer_periods =
     clib_cpu_time_now () >> POLICER_TICKS_PER_PERIOD_SHIFT;

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

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

       while (n_left_from >= 4 && n_left_to_next >= 2)
 	{
 	  vlib_buffer_t *b0, *b1;
 	  u32 next0, next1;
 	  u8 act0, act1;
 	  u32 bi0, bi1;

 	  next0 = next1 = 0;
 	  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;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  b1 = vlib_get_buffer (vm, bi1);

 	  act0 = vnet_policer_police (vm, b0, policer_index,
 				      time_in_policer_periods, POLICE_CONFORM,
 				      true);
 	  act1 = vnet_policer_police (vm, b1, policer_index,
 				      time_in_policer_periods, POLICE_CONFORM,
 				      true);

 	  if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF))
 	    {
 	      next0 = next1 = IP_PUNT_POLICER_NEXT_HANDOFF;
 	    }
 	  else
 	    {

 	      vnet_get_config_data (&cm->config_main,
 				    &b0->current_config_index, &next0, 0);
 	      vnet_get_config_data (&cm->config_main,
 				    &b1->current_config_index, &next1, 0);

 	      if (PREDICT_FALSE (act0 == QOS_ACTION_DROP))
 		{
 		  next0 = IP_PUNT_POLICER_NEXT_DROP;
 		  b0->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
 		}
 	      if (PREDICT_FALSE (act1 == QOS_ACTION_DROP))
 		{
 		  next1 = IP_PUNT_POLICER_NEXT_DROP;
 		  b1->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
 		}

 	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 		{
 		  ip_punt_policer_trace_t *t =
 		    vlib_add_trace (vm, node, b0, sizeof (*t));
 		  t->next = next0;
 		  t->policer_index = policer_index;
 		}
 	      if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 		{
 		  ip_punt_policer_trace_t *t =
 		    vlib_add_trace (vm, node, b1, sizeof (*t));
 		  t->next = next1;
 		  t->policer_index = policer_index;
 		}
 	    }

 	  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)
 	{
 	  vlib_buffer_t *b0;
 	  u32 next0;
 	  u32 bi0;
 	  u8 act0;

 	  next0 = 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);

 	  act0 = vnet_policer_police (vm, b0, policer_index,
 				      time_in_policer_periods, POLICE_CONFORM,
 				      true);
 	  if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF))
 	    {
 	      next0 = IP_PUNT_POLICER_NEXT_HANDOFF;
 	    }
 	  else
 	    {
 	      vnet_get_config_data (&cm->config_main,
 				    &b0->current_config_index, &next0, 0);

 	      if (PREDICT_FALSE (act0 == QOS_ACTION_DROP))
 		{
 		  next0 = IP_PUNT_POLICER_NEXT_DROP;
 		  b0->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
 		}

 	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 		{
 		  ip_punt_policer_trace_t *t =
 		    vlib_add_trace (vm, node, b0, sizeof (*t));
 		  t->next = next0;
 		  t->policer_index = policer_index;
 		}
 	    }
 	  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);
     }

   return frame->n_vectors;
 }

 /**
  * IP4 punt redirect per-rx interface configuration
  *   redirect punted traffic to another location.
  */
 typedef struct ip_punt_redirect_rx_t_
 {
   /**
    * Node linkage into the FIB graph
    */
   fib_node_t node;

   fib_protocol_t fproto;
   fib_forward_chain_type_t payload_type;
   fib_node_index_t pl;
   u32 sibling;

   /**
    * redirect forwarding
    */
   dpo_id_t dpo;
 } ip_punt_redirect_rx_t;

 /**
  * IP punt redirect configuration
  */
 typedef struct ip_punt_redirect_t_
 {
   ip_punt_redirect_rx_t *pool;

   /**
    * per-RX interface configuration.
    *  sw_if_index = 0 (from which packets are never received) is used to
    *  indicate 'from-any'
    */
   index_t *redirect_by_rx_sw_if_index[FIB_PROTOCOL_IP_MAX];
 } ip_punt_redirect_cfg_t;

 extern ip_punt_redirect_cfg_t ip_punt_redirect_cfg;

 /**
  * IP punt redirect next nodes
  */
 typedef enum ip_punt_redirect_next_t_
 {
   IP_PUNT_REDIRECT_NEXT_DROP,
   IP_PUNT_REDIRECT_NEXT_TX,
   IP_PUNT_REDIRECT_NEXT_ARP,
   IP_PUNT_REDIRECT_N_NEXT,
 } ip_punt_redirect_next_t;

 /**
  * IP Punt redirect trace
  */
 typedef struct ip4_punt_redirect_trace_t_
 {
   index_t rrxi;
   u32 next;
 } ip_punt_redirect_trace_t;

 /**
  * Add a punt redirect entry
  */
 extern void ip_punt_redirect_add (fib_protocol_t fproto, u32 rx_sw_if_index,
 				  fib_forward_chain_type_t ct,
 				  const fib_route_path_t *rpaths);

 extern void ip_punt_redirect_del (fib_protocol_t fproto, u32 rx_sw_if_index);
 extern index_t ip_punt_redirect_find (fib_protocol_t fproto,
 				      u32 rx_sw_if_index);
 extern u8 *format_ip_punt_redirect (u8 * s, va_list * args);

 extern u8 *format_ip_punt_redirect_trace (u8 * s, va_list * args);

 typedef walk_rc_t (*ip_punt_redirect_walk_cb_t) (u32 rx_sw_if_index,
 						 const ip_punt_redirect_rx_t *
 						 redirect, void *arg);
 extern void ip_punt_redirect_walk (fib_protocol_t fproto,
 				   ip_punt_redirect_walk_cb_t cb, void *ctx);

 static_always_inline ip_punt_redirect_rx_t *
 ip_punt_redirect_get (index_t rrxi)
 {
   return (pool_elt_at_index (ip_punt_redirect_cfg.pool, rrxi));
 }

 always_inline uword
 ip_punt_redirect (vlib_main_t * vm,
 		  vlib_node_runtime_t * node,
 		  vlib_frame_t * frame, u8 arc_index, fib_protocol_t fproto)
 {
   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
   vnet_feature_main_t *fm = &feature_main;
   vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_index];
   index_t *redirects;

   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;
   next_index = node->cached_next_index;
   redirects = ip_punt_redirect_cfg.redirect_by_rx_sw_if_index[fproto];

   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 rx_sw_if_index0, rrxi0;
 	  ip_punt_redirect_rx_t *rrx0;
 	  vlib_buffer_t *b0;
 	  u32 next0;
 	  u32 bi0;

 	  rrxi0 = INDEX_INVALID;
 	  next0 = 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);

 	  vnet_get_config_data (&cm->config_main,
 				&b0->current_config_index, &next0, 0);

 	  rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];

 	  /*
 	   * If config exists for this particular RX interface use it,
 	   * else use the default (at RX = 0)
 	   */
 	  if (vec_len (redirects) > rx_sw_if_index0)
 	    {
 	      rrxi0 = redirects[rx_sw_if_index0];
 	      if (INDEX_INVALID == rrxi0)
 		rrxi0 = redirects[0];
 	    }
 	  else if (vec_len (redirects) >= 1)
 	    rrxi0 = redirects[0];

 	  if (PREDICT_TRUE (INDEX_INVALID != rrxi0))
 	    {
 	      /* prevent ttl decrement on forward */
 	      b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 	      rrx0 = ip_punt_redirect_get (rrxi0);
 	      vnet_buffer (b0)->ip.adj_index[VLIB_TX] = rrx0->dpo.dpoi_index;
 	      next0 = rrx0->dpo.dpoi_next_node;
 	    }

 	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      ip_punt_redirect_trace_t *t =
 		vlib_add_trace (vm, node, b0, sizeof (*t));
 	      t->next = next0;
 	      t->rrxi = rrxi0;
 	    }

 	  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);
     }

   return frame->n_vectors;
 }

 always_inline uword
 ip_drop_or_punt (vlib_main_t * vm,
 		 vlib_node_runtime_t * node,
 		 vlib_frame_t * frame, u8 arc_index)
 {
   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;

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

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

       while (n_left_from >= 8 && n_left_to_next >= 4)
 	{
 	  vlib_buffer_t *b0, *b1, *b2, *b3;
 	  u32 next0, next1, next2, next3;
 	  u32 bi0, bi1, bi2, bi3;

 	  next0 = next1 = next2 = next3 = 0;

 	  /* Prefetch next iteration. */
 	  {
 	    vlib_buffer_t *p4, *p5, *p6, *p7;

 	    p4 = vlib_get_buffer (vm, from[4]);
 	    p5 = vlib_get_buffer (vm, from[5]);
 	    p6 = vlib_get_buffer (vm, from[6]);
 	    p7 = vlib_get_buffer (vm, from[7]);

 	    vlib_prefetch_buffer_header (p4, LOAD);
 	    vlib_prefetch_buffer_header (p5, LOAD);
 	    vlib_prefetch_buffer_header (p6, LOAD);
 	    vlib_prefetch_buffer_header (p7, LOAD);
 	  }

 	  bi0 = to_next[0] = from[0];
 	  bi1 = to_next[1] = from[1];
 	  bi2 = to_next[2] = from[2];
 	  bi3 = to_next[3] = from[3];

 	  from += 4;
 	  n_left_from -= 4;
 	  to_next += 4;
 	  n_left_to_next -= 4;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  b1 = vlib_get_buffer (vm, bi1);
 	  b2 = vlib_get_buffer (vm, bi2);
 	  b3 = vlib_get_buffer (vm, bi3);

 	  /* punt and drop features are not associated with a given interface
 	   * so the special index 0 is used */
 	  vnet_feature_arc_start (arc_index, 0, &next0, b0);
 	  vnet_feature_arc_start (arc_index, 0, &next1, b1);
 	  vnet_feature_arc_start (arc_index, 0, &next2, b2);
 	  vnet_feature_arc_start (arc_index, 0, &next3, b3);

 	  vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
 					   to_next, n_left_to_next,
 					   bi0, bi1, bi2, bi3,
 					   next0, next1, next2, next3);
 	}

       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  vlib_buffer_t *b0;
 	  u32 next0;
 	  u32 bi0;

 	  next0 = 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);

 	  vnet_feature_arc_start (arc_index, 0, &next0, b0);

 	  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);
     }

   return frame->n_vectors;
 }

 #endif

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

	#ifndef __IP_PUNT_DROP_H__
	#define __IP_PUNT_DROP_H__

	#include <vnet/ip/ip.h>
	#include <vnet/policer/policer.h>
	#include <vnet/policer/police_inlines.h>

	/**
	* IP4 punt policer configuration
	* we police the punt rate to prevent overloading the host
	*/
	typedef struct ip_punt_policer_t_
	{
	u32 policer_index;
	u32 fq_index;
	} ip_punt_policer_t;

	typedef enum ip_punt_policer_next_t_
	{
	IP_PUNT_POLICER_NEXT_DROP,
	IP_PUNT_POLICER_NEXT_HANDOFF,
	IP_PUNT_POLICER_N_NEXT,
	} ip_punt_policer_next_t;

	typedef struct ip_punt_policer_trace_t_
	{
	u32 policer_index;
	u32 next;
	} ip_punt_policer_trace_t;

	#define foreach_ip_punt_policer_error \
	_(DROP, "ip punt policer drop")

	typedef enum
	{
	#define _(sym,str) IP_PUNT_POLICER_ERROR_##sym,
	foreach_ip_punt_policer_error
	#undef _
	IP4_PUNT_POLICER_N_ERROR,
	} ip_punt_policer_error_t;

	extern u8 format_ip_punt_policer_trace (u8 s, va_list * args);
	extern vlib_node_registration_t ip4_punt_policer_node;
	extern ip_punt_policer_t ip4_punt_policer_cfg;
	extern vlib_node_registration_t ip6_punt_policer_node;
	extern ip_punt_policer_t ip6_punt_policer_cfg;

	/**
	* IP punt policing node function
	*/
	always_inline uword
	ip_punt_policer (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame, u8 arc_index, u32 policer_index)
	{
	u32 from, to_next, n_left_from, n_left_to_next, next_index;
	u64 time_in_policer_periods;
	vnet_feature_main_t *fm = &feature_main;
	vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_index];

	time_in_policer_periods =
	clib_cpu_time_now () >> POLICER_TICKS_PER_PERIOD_SHIFT;

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

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

	while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	vlib_buffer_t b0, b1;
	u32 next0, next1;
	u8 act0, act1;
	u32 bi0, bi1;

	next0 = next1 = 0;
	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;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);

	act0 = vnet_policer_police (vm, b0, policer_index,
	time_in_policer_periods, POLICE_CONFORM,
	true);
	act1 = vnet_policer_police (vm, b1, policer_index,
	time_in_policer_periods, POLICE_CONFORM,
	true);

	if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF))
	{
	next0 = next1 = IP_PUNT_POLICER_NEXT_HANDOFF;
	}
	else
	{

	vnet_get_config_data (&cm->config_main,
	&b0->current_config_index, &next0, 0);
	vnet_get_config_data (&cm->config_main,
	&b1->current_config_index, &next1, 0);

	if (PREDICT_FALSE (act0 == QOS_ACTION_DROP))
	{
	next0 = IP_PUNT_POLICER_NEXT_DROP;
	b0->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
	}
	if (PREDICT_FALSE (act1 == QOS_ACTION_DROP))
	{
	next1 = IP_PUNT_POLICER_NEXT_DROP;
	b1->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
	}

	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ip_punt_policer_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->next = next0;
	t->policer_index = policer_index;
	}
	if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
	{
	ip_punt_policer_trace_t *t =
	vlib_add_trace (vm, node, b1, sizeof (*t));
	t->next = next1;
	t->policer_index = policer_index;
	}
	}

	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)
	{
	vlib_buffer_t *b0;
	u32 next0;
	u32 bi0;
	u8 act0;

	next0 = 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);

	act0 = vnet_policer_police (vm, b0, policer_index,
	time_in_policer_periods, POLICE_CONFORM,
	true);
	if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF))
	{
	next0 = IP_PUNT_POLICER_NEXT_HANDOFF;
	}
	else
	{
	vnet_get_config_data (&cm->config_main,
	&b0->current_config_index, &next0, 0);

	if (PREDICT_FALSE (act0 == QOS_ACTION_DROP))
	{
	next0 = IP_PUNT_POLICER_NEXT_DROP;
	b0->error = node->errors[IP_PUNT_POLICER_ERROR_DROP];
	}

	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ip_punt_policer_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->next = next0;
	t->policer_index = policer_index;
	}
	}
	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);
	}

	return frame->n_vectors;
	}

	/**
	* IP4 punt redirect per-rx interface configuration
	* redirect punted traffic to another location.
	*/
	typedef struct ip_punt_redirect_rx_t_
	{
	/**
	* Node linkage into the FIB graph
	*/
	fib_node_t node;

	fib_protocol_t fproto;
	fib_forward_chain_type_t payload_type;
	fib_node_index_t pl;
	u32 sibling;

	/**
	* redirect forwarding
	*/
	dpo_id_t dpo;
	} ip_punt_redirect_rx_t;

	/**
	* IP punt redirect configuration
	*/
	typedef struct ip_punt_redirect_t_
	{
	ip_punt_redirect_rx_t *pool;

	/**
	* per-RX interface configuration.
	* sw_if_index = 0 (from which packets are never received) is used to
	* indicate 'from-any'
	*/
	index_t *redirect_by_rx_sw_if_index[FIB_PROTOCOL_IP_MAX];
	} ip_punt_redirect_cfg_t;

	extern ip_punt_redirect_cfg_t ip_punt_redirect_cfg;

	/**
	* IP punt redirect next nodes
	*/
	typedef enum ip_punt_redirect_next_t_
	{
	IP_PUNT_REDIRECT_NEXT_DROP,
	IP_PUNT_REDIRECT_NEXT_TX,
	IP_PUNT_REDIRECT_NEXT_ARP,
	IP_PUNT_REDIRECT_N_NEXT,
	} ip_punt_redirect_next_t;

	/**
	* IP Punt redirect trace
	*/
	typedef struct ip4_punt_redirect_trace_t_
	{
	index_t rrxi;
	u32 next;
	} ip_punt_redirect_trace_t;

	/**
	* Add a punt redirect entry
	*/
	extern void ip_punt_redirect_add (fib_protocol_t fproto, u32 rx_sw_if_index,
	fib_forward_chain_type_t ct,
	const fib_route_path_t *rpaths);

	extern void ip_punt_redirect_del (fib_protocol_t fproto, u32 rx_sw_if_index);
	extern index_t ip_punt_redirect_find (fib_protocol_t fproto,
	u32 rx_sw_if_index);
	extern u8 format_ip_punt_redirect (u8 s, va_list * args);

	extern u8 format_ip_punt_redirect_trace (u8 s, va_list * args);

	typedef walk_rc_t (*ip_punt_redirect_walk_cb_t) (u32 rx_sw_if_index,
	const ip_punt_redirect_rx_t *
	redirect, void *arg);
	extern void ip_punt_redirect_walk (fib_protocol_t fproto,
	ip_punt_redirect_walk_cb_t cb, void *ctx);

	static_always_inline ip_punt_redirect_rx_t *
	ip_punt_redirect_get (index_t rrxi)
	{
	return (pool_elt_at_index (ip_punt_redirect_cfg.pool, rrxi));
	}

	always_inline uword
	ip_punt_redirect (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame, u8 arc_index, fib_protocol_t fproto)
	{
	u32 from, to_next, n_left_from, n_left_to_next, next_index;
	vnet_feature_main_t *fm = &feature_main;
	vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_index];
	index_t *redirects;

	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors;
	next_index = node->cached_next_index;
	redirects = ip_punt_redirect_cfg.redirect_by_rx_sw_if_index[fproto];

	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 rx_sw_if_index0, rrxi0;
	ip_punt_redirect_rx_t *rrx0;
	vlib_buffer_t *b0;
	u32 next0;
	u32 bi0;

	rrxi0 = INDEX_INVALID;
	next0 = 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);

	vnet_get_config_data (&cm->config_main,
	&b0->current_config_index, &next0, 0);

	rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];

	/*
	* If config exists for this particular RX interface use it,
	* else use the default (at RX = 0)
	*/
	if (vec_len (redirects) > rx_sw_if_index0)
	{
	rrxi0 = redirects[rx_sw_if_index0];
	if (INDEX_INVALID == rrxi0)
	rrxi0 = redirects[0];
	}
	else if (vec_len (redirects) >= 1)
	rrxi0 = redirects[0];

	if (PREDICT_TRUE (INDEX_INVALID != rrxi0))
	{
	/* prevent ttl decrement on forward */
	b0->flags \|= VNET_BUFFER_F_LOCALLY_ORIGINATED;
	rrx0 = ip_punt_redirect_get (rrxi0);
	vnet_buffer (b0)->ip.adj_index[VLIB_TX] = rrx0->dpo.dpoi_index;
	next0 = rrx0->dpo.dpoi_next_node;
	}

	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	ip_punt_redirect_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->next = next0;
	t->rrxi = rrxi0;
	}

	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);
	}

	return frame->n_vectors;
	}

	always_inline uword
	ip_drop_or_punt (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame, u8 arc_index)
	{
	u32 from, to_next, n_left_from, n_left_to_next, next_index;

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

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

	while (n_left_from >= 8 && n_left_to_next >= 4)
	{
	vlib_buffer_t b0, b1, b2, b3;
	u32 next0, next1, next2, next3;
	u32 bi0, bi1, bi2, bi3;

	next0 = next1 = next2 = next3 = 0;

	/* Prefetch next iteration. */
	{
	vlib_buffer_t p4, p5, p6, p7;

	p4 = vlib_get_buffer (vm, from[4]);
	p5 = vlib_get_buffer (vm, from[5]);
	p6 = vlib_get_buffer (vm, from[6]);
	p7 = vlib_get_buffer (vm, from[7]);

	vlib_prefetch_buffer_header (p4, LOAD);
	vlib_prefetch_buffer_header (p5, LOAD);
	vlib_prefetch_buffer_header (p6, LOAD);
	vlib_prefetch_buffer_header (p7, LOAD);
	}

	bi0 = to_next[0] = from[0];
	bi1 = to_next[1] = from[1];
	bi2 = to_next[2] = from[2];
	bi3 = to_next[3] = from[3];

	from += 4;
	n_left_from -= 4;
	to_next += 4;
	n_left_to_next -= 4;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);
	b2 = vlib_get_buffer (vm, bi2);
	b3 = vlib_get_buffer (vm, bi3);

	/* punt and drop features are not associated with a given interface
	* so the special index 0 is used */
	vnet_feature_arc_start (arc_index, 0, &next0, b0);
	vnet_feature_arc_start (arc_index, 0, &next1, b1);
	vnet_feature_arc_start (arc_index, 0, &next2, b2);
	vnet_feature_arc_start (arc_index, 0, &next3, b3);

	vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, bi1, bi2, bi3,
	next0, next1, next2, next3);
	}

	while (n_left_from > 0 && n_left_to_next > 0)
	{
	vlib_buffer_t *b0;
	u32 next0;
	u32 bi0;

	next0 = 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);

	vnet_feature_arc_start (arc_index, 0, &next0, b0);

	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);
	}

	return frame->n_vectors;
	}

	#endif

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