src/vnet/l2/l2_in_out_acl.c - fdio/vpp - Gitiles

 /*
  * l2_in_out_acl.c : layer 2 input/output acl processing
  *
  * Copyright (c) 2013,2018 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 <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/ethernet/packet.h>
 #include <vnet/ip/ip_packet.h>
 #include <vnet/ip/ip4_packet.h>
 #include <vnet/ip/ip6_packet.h>
 #include <vlib/cli.h>
 #include <vnet/l2/l2_input.h>
 #include <vnet/l2/l2_output.h>
 #include <vnet/l2/feat_bitmap.h>

 #include <vppinfra/error.h>
 #include <vppinfra/hash.h>
 #include <vppinfra/cache.h>

 #include <vnet/classify/vnet_classify.h>
 #include <vnet/classify/in_out_acl.h>

 typedef struct
 {

   /* Next nodes for each feature */
   u32 feat_next_node_index[IN_OUT_ACL_N_TABLE_GROUPS][32];

   /* convenience variables */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
 } l2_in_out_acl_main_t;

 typedef struct
 {
   u32 sw_if_index;
   u32 next_index;
   u32 table_index;
   u32 offset;
 } l2_in_out_acl_trace_t;

 /* packet trace format function */
 static u8 *
 format_l2_in_out_acl_trace (u8 * s, u32 is_output, 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 *);
   l2_in_out_acl_trace_t *t = va_arg (*args, l2_in_out_acl_trace_t *);

   s = format (s, "%s: sw_if_index %d, next_index %d, table %d, offset %d",
 	      is_output ? "OUTACL" : "INACL",
 	      t->sw_if_index, t->next_index, t->table_index, t->offset);
   return s;
 }

 static u8 *
 format_l2_inacl_trace (u8 * s, va_list * args)
 {
   return format_l2_in_out_acl_trace (s, IN_OUT_ACL_INPUT_TABLE_GROUP, args);
 }

 static u8 *
 format_l2_outacl_trace (u8 * s, va_list * args)
 {
   return format_l2_in_out_acl_trace (s, IN_OUT_ACL_OUTPUT_TABLE_GROUP, args);
 }

 extern l2_in_out_acl_main_t l2_in_out_acl_main;

 #ifndef CLIB_MARCH_VARIANT
 l2_in_out_acl_main_t l2_in_out_acl_main;
 #endif /* CLIB_MARCH_VARIANT */

 extern vlib_node_registration_t l2_inacl_node;
 extern vlib_node_registration_t l2_outacl_node;

 #define foreach_l2_inacl_error                  \
 _(NONE, "valid input ACL packets")              \
 _(MISS, "input ACL misses")                     \
 _(HIT, "input ACL hits")                        \
 _(CHAIN_HIT, "input ACL hits after chain walk") \
 _(TABLE_MISS, "input ACL table-miss drops")     \
 _(SESSION_DENY, "input ACL session deny drops")

 #define foreach_l2_outacl_error                  \
 _(NONE, "valid output ACL packets")              \
 _(MISS, "output ACL misses")                     \
 _(HIT, "output ACL hits")                        \
 _(CHAIN_HIT, "output ACL hits after chain walk") \
 _(TABLE_MISS, "output ACL table-miss drops")     \
 _(SESSION_DENY, "output ACL session deny drops")


 typedef enum
 {
 #define _(sym,str) L2_INACL_ERROR_##sym,
   foreach_l2_inacl_error
 #undef _
     L2_INACL_N_ERROR,
 } l2_inacl_error_t;

 static char *l2_inacl_error_strings[] = {
 #define _(sym,string) string,
   foreach_l2_inacl_error
 #undef _
 };

 typedef enum
 {
 #define _(sym,str) L2_OUTACL_ERROR_##sym,
   foreach_l2_outacl_error
 #undef _
     L2_OUTACL_N_ERROR,
 } l2_outacl_error_t;

 static char *l2_outacl_error_strings[] = {
 #define _(sym,string) string,
   foreach_l2_outacl_error
 #undef _
 };


 static inline uword
 l2_in_out_acl_node_fn (vlib_main_t * vm,
 		       vlib_node_runtime_t * node, vlib_frame_t * frame,
 		       int is_output)
 {
   u32 n_left_from, *from, *to_next;
   acl_next_index_t next_index;
   l2_in_out_acl_main_t *msm = &l2_in_out_acl_main;
   in_out_acl_main_t *am = &in_out_acl_main;
   vnet_classify_main_t *vcm = am->vnet_classify_main;
   in_out_acl_table_id_t tid = IN_OUT_ACL_TABLE_L2;
   f64 now = vlib_time_now (vm);
   u32 hits = 0;
   u32 misses = 0;
   u32 chain_hits = 0;

   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;	/* number of packets to process */
   next_index = node->cached_next_index;

   /* First pass: compute hashes */
   while (n_left_from > 2)
     {
       vlib_buffer_t *b0, *b1;
       u32 bi0, bi1;
       u8 *h0, *h1;
       u32 sw_if_index0, sw_if_index1;
       u32 table_index0, table_index1;
       vnet_classify_table_t *t0, *t1;

       /* prefetch next iteration */
       {
 	vlib_buffer_t *p1, *p2;

 	p1 = vlib_get_buffer (vm, from[1]);
 	p2 = vlib_get_buffer (vm, from[2]);

 	vlib_prefetch_buffer_header (p1, STORE);
 	clib_prefetch_store (p1->data);
 	vlib_prefetch_buffer_header (p2, STORE);
 	clib_prefetch_store (p2->data);
       }

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);

       bi1 = from[1];
       b1 = vlib_get_buffer (vm, bi1);

       sw_if_index0 =
 	vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
       table_index0 =
 	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index0];

       sw_if_index1 =
 	vnet_buffer (b1)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
       table_index1 =
 	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index1];

       t0 = pool_elt_at_index (vcm->tables, table_index0);

       t1 = pool_elt_at_index (vcm->tables, table_index1);

       if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
 	h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
       else
 	h0 = (void *) vlib_buffer_get_current (b0);

       vnet_buffer (b0)->l2_classify.hash =
 	vnet_classify_hash_packet (t0, (u8 *) h0);

       vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

       if (t1->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
 	h1 = (void *) vlib_buffer_get_current (b1) + t1->current_data_offset;
       else
 	h1 = (void *) vlib_buffer_get_current (b1);

       vnet_buffer (b1)->l2_classify.hash =
 	vnet_classify_hash_packet (t1, (u8 *) h1);

       vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);

       vnet_buffer (b0)->l2_classify.table_index = table_index0;

       vnet_buffer (b1)->l2_classify.table_index = table_index1;

       from += 2;
       n_left_from -= 2;
     }

   while (n_left_from > 0)
     {
       vlib_buffer_t *b0;
       u32 bi0;
       u8 *h0;
       u32 sw_if_index0;
       u32 table_index0;
       vnet_classify_table_t *t0;

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);

       sw_if_index0 =
 	vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
       table_index0 =
 	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index0];

       t0 = pool_elt_at_index (vcm->tables, table_index0);

       if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
 	h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
       else
 	h0 = (void *) vlib_buffer_get_current (b0);

       vnet_buffer (b0)->l2_classify.hash =
 	vnet_classify_hash_packet (t0, (u8 *) h0);

       vnet_buffer (b0)->l2_classify.table_index = table_index0;
       vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

       from++;
       n_left_from--;
     }

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

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

       /* Not enough load/store slots to dual loop... */
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0;
 	  vlib_buffer_t *b0;
 	  u32 next0 = ACL_NEXT_INDEX_DENY;
 	  u32 table_index0;
 	  vnet_classify_table_t *t0;
 	  vnet_classify_entry_t *e0;
 	  u32 hash0;
 	  u8 *h0;
 	  u8 error0;

 	  /* Stride 3 seems to work best */
 	  if (PREDICT_TRUE (n_left_from > 3))
 	    {
 	      vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
 	      vnet_classify_table_t *tp1;
 	      u32 table_index1;
 	      u32 phash1;

 	      table_index1 = vnet_buffer (p1)->l2_classify.table_index;

 	      if (PREDICT_TRUE (table_index1 != ~0))
 		{
 		  tp1 = pool_elt_at_index (vcm->tables, table_index1);
 		  phash1 = vnet_buffer (p1)->l2_classify.hash;
 		  vnet_classify_prefetch_entry (tp1, phash1);
 		}
 	    }

 	  /* speculatively enqueue b0 to the current next frame */
 	  bi0 = from[0];
 	  to_next[0] = bi0;
 	  from += 1;
 	  to_next += 1;
 	  n_left_from -= 1;
 	  n_left_to_next -= 1;

 	  b0 = vlib_get_buffer (vm, bi0);

 	  table_index0 = vnet_buffer (b0)->l2_classify.table_index;
 	  e0 = 0;
 	  t0 = 0;

 	  vnet_buffer (b0)->l2_classify.opaque_index = ~0;

 	  /* Determine the next node */
 	  next0 =
 	    vnet_l2_feature_next (b0, msm->feat_next_node_index[is_output],
 				  is_output ? L2OUTPUT_FEAT_ACL :
 				  L2INPUT_FEAT_ACL);

 	  if (PREDICT_TRUE (table_index0 != ~0))
 	    {
 	      hash0 = vnet_buffer (b0)->l2_classify.hash;
 	      t0 = pool_elt_at_index (vcm->tables, table_index0);

 	      if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
 		h0 =
 		  (void *) vlib_buffer_get_current (b0) +
 		  t0->current_data_offset;
 	      else
 		h0 = (void *) vlib_buffer_get_current (b0);

 	      e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
 	      if (e0)
 		{
 		  vnet_buffer (b0)->l2_classify.opaque_index
 		    = e0->opaque_index;
 		  vlib_buffer_advance (b0, e0->advance);

 		  next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
 		    e0->next_index : next0;

 		  hits++;

 		  if (is_output)
 		    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 		      L2_OUTACL_ERROR_SESSION_DENY : L2_INACL_ERROR_NONE;
 		  else
 		    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 		      L2_OUTACL_ERROR_SESSION_DENY : L2_OUTACL_ERROR_NONE;
 		  b0->error = node->errors[error0];
 		}
 	      else
 		{
 		  while (1)
 		    {
 		      if (PREDICT_TRUE (t0->next_table_index != ~0))
 			t0 = pool_elt_at_index (vcm->tables,
 						t0->next_table_index);
 		      else
 			{
 			  next0 =
 			    (t0->miss_next_index <
 			     ACL_NEXT_INDEX_N_NEXT) ? t0->miss_next_index :
 			    next0;

 			  misses++;

 			  if (is_output)
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      L2_OUTACL_ERROR_TABLE_MISS :
 			      L2_OUTACL_ERROR_NONE;
 			  else
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      L2_INACL_ERROR_TABLE_MISS : L2_INACL_ERROR_NONE;
 			  b0->error = node->errors[error0];
 			  break;
 			}

 		      if (t0->current_data_flag ==
 			  CLASSIFY_FLAG_USE_CURR_DATA)
 			h0 =
 			  (void *) vlib_buffer_get_current (b0) +
 			  t0->current_data_offset;
 		      else
 			h0 = (void *) vlib_buffer_get_current (b0);

 		      hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
 		      e0 = vnet_classify_find_entry
 			(t0, (u8 *) h0, hash0, now);
 		      if (e0)
 			{
 			  vlib_buffer_advance (b0, e0->advance);
 			  next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
 			    e0->next_index : next0;
 			  hits++;
 			  chain_hits++;

 			  if (is_output)
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      L2_OUTACL_ERROR_SESSION_DENY :
 			      L2_OUTACL_ERROR_NONE;
 			  else
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      L2_INACL_ERROR_SESSION_DENY :
 			      L2_INACL_ERROR_NONE;
 			  b0->error = node->errors[error0];
 			  break;
 			}
 		    }
 		}
 	    }

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      l2_in_out_acl_trace_t *t =
 		vlib_add_trace (vm, node, b0, sizeof (*t));
 	      t->sw_if_index =
 		vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
 	      t->next_index = next0;
 	      t->table_index = t0 ? t0 - vcm->tables : ~0;
 	      t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
 	    }

 	  /* verify speculative enqueue, maybe switch current next frame */
 	  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, node->node_index,
 			       is_output ? L2_OUTACL_ERROR_MISS :
 			       L2_INACL_ERROR_MISS, misses);
   vlib_node_increment_counter (vm, node->node_index,
 			       is_output ? L2_OUTACL_ERROR_HIT :
 			       L2_INACL_ERROR_HIT, hits);
   vlib_node_increment_counter (vm, node->node_index,
 			       is_output ? L2_OUTACL_ERROR_CHAIN_HIT :
 			       L2_INACL_ERROR_CHAIN_HIT, chain_hits);
   return frame->n_vectors;
 }

 VLIB_NODE_FN (l2_inacl_node) (vlib_main_t * vm,
 			      vlib_node_runtime_t * node,
 			      vlib_frame_t * frame)
 {
   return l2_in_out_acl_node_fn (vm, node, frame,
 				IN_OUT_ACL_INPUT_TABLE_GROUP);
 }

 VLIB_NODE_FN (l2_outacl_node) (vlib_main_t * vm,
 			       vlib_node_runtime_t * node,
 			       vlib_frame_t * frame)
 {
   return l2_in_out_acl_node_fn (vm, node, frame,
 				IN_OUT_ACL_OUTPUT_TABLE_GROUP);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (l2_inacl_node) = {
   .name = "l2-input-acl",
   .vector_size = sizeof (u32),
   .format_trace = format_l2_inacl_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(l2_inacl_error_strings),
   .error_strings = l2_inacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,

   /* edit / add dispositions here */
   .next_nodes = {
        [ACL_NEXT_INDEX_DENY]  = "error-drop",
   },
 };

 VLIB_REGISTER_NODE (l2_outacl_node) = {
   .name = "l2-output-acl",
   .vector_size = sizeof (u32),
   .format_trace = format_l2_outacl_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(l2_outacl_error_strings),
   .error_strings = l2_outacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,

   /* edit / add dispositions here */
   .next_nodes = {
        [ACL_NEXT_INDEX_DENY]  = "error-drop",
   },
 };
 /* *INDENT-ON* */


 #ifndef CLIB_MARCH_VARIANT
 clib_error_t *
 l2_in_out_acl_init (vlib_main_t * vm)
 {
   l2_in_out_acl_main_t *mp = &l2_in_out_acl_main;

   mp->vlib_main = vm;
   mp->vnet_main = vnet_get_main ();

   /* Initialize the feature next-node indexes */
   feat_bitmap_init_next_nodes (vm,
 			       l2_inacl_node.index,
 			       L2INPUT_N_FEAT,
 			       l2input_get_feat_names (),
 			       mp->feat_next_node_index
 			       [IN_OUT_ACL_INPUT_TABLE_GROUP]);
   feat_bitmap_init_next_nodes (vm, l2_outacl_node.index, L2OUTPUT_N_FEAT,
 			       l2output_get_feat_names (),
 			       mp->feat_next_node_index
 			       [IN_OUT_ACL_OUTPUT_TABLE_GROUP]);

   return 0;
 }

 VLIB_INIT_FUNCTION (l2_in_out_acl_init);
 #endif /* CLIB_MARCH_VARIANT */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* l2_in_out_acl.c : layer 2 input/output acl processing
	*
	* Copyright (c) 2013,2018 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 <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vnet/ethernet/ethernet.h>
	#include <vnet/ethernet/packet.h>
	#include <vnet/ip/ip_packet.h>
	#include <vnet/ip/ip4_packet.h>
	#include <vnet/ip/ip6_packet.h>
	#include <vlib/cli.h>
	#include <vnet/l2/l2_input.h>
	#include <vnet/l2/l2_output.h>
	#include <vnet/l2/feat_bitmap.h>

	#include <vppinfra/error.h>
	#include <vppinfra/hash.h>
	#include <vppinfra/cache.h>

	#include <vnet/classify/vnet_classify.h>
	#include <vnet/classify/in_out_acl.h>

	typedef struct
	{

	/* Next nodes for each feature */
	u32 feat_next_node_index[IN_OUT_ACL_N_TABLE_GROUPS][32];

	/* convenience variables */
	vlib_main_t *vlib_main;
	vnet_main_t *vnet_main;
	} l2_in_out_acl_main_t;

	typedef struct
	{
	u32 sw_if_index;
	u32 next_index;
	u32 table_index;
	u32 offset;
	} l2_in_out_acl_trace_t;

	/* packet trace format function */
	static u8 *
	format_l2_in_out_acl_trace (u8 * s, u32 is_output, 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 );
	l2_in_out_acl_trace_t t = va_arg (args, l2_in_out_acl_trace_t *);

	s = format (s, "%s: sw_if_index %d, next_index %d, table %d, offset %d",
	is_output ? "OUTACL" : "INACL",
	t->sw_if_index, t->next_index, t->table_index, t->offset);
	return s;
	}

	static u8 *
	format_l2_inacl_trace (u8 * s, va_list * args)
	{
	return format_l2_in_out_acl_trace (s, IN_OUT_ACL_INPUT_TABLE_GROUP, args);
	}

	static u8 *
	format_l2_outacl_trace (u8 * s, va_list * args)
	{
	return format_l2_in_out_acl_trace (s, IN_OUT_ACL_OUTPUT_TABLE_GROUP, args);
	}

	extern l2_in_out_acl_main_t l2_in_out_acl_main;

	#ifndef CLIB_MARCH_VARIANT
	l2_in_out_acl_main_t l2_in_out_acl_main;
	#endif /* CLIB_MARCH_VARIANT */

	extern vlib_node_registration_t l2_inacl_node;
	extern vlib_node_registration_t l2_outacl_node;

	#define foreach_l2_inacl_error \
	_(NONE, "valid input ACL packets") \
	_(MISS, "input ACL misses") \
	_(HIT, "input ACL hits") \
	_(CHAIN_HIT, "input ACL hits after chain walk") \
	_(TABLE_MISS, "input ACL table-miss drops") \
	_(SESSION_DENY, "input ACL session deny drops")

	#define foreach_l2_outacl_error \
	_(NONE, "valid output ACL packets") \
	_(MISS, "output ACL misses") \
	_(HIT, "output ACL hits") \
	_(CHAIN_HIT, "output ACL hits after chain walk") \
	_(TABLE_MISS, "output ACL table-miss drops") \
	_(SESSION_DENY, "output ACL session deny drops")


	typedef enum
	{
	#define _(sym,str) L2_INACL_ERROR_##sym,
	foreach_l2_inacl_error
	#undef _
	L2_INACL_N_ERROR,
	} l2_inacl_error_t;

	static char *l2_inacl_error_strings[] = {
	#define _(sym,string) string,
	foreach_l2_inacl_error
	#undef _
	};

	typedef enum
	{
	#define _(sym,str) L2_OUTACL_ERROR_##sym,
	foreach_l2_outacl_error
	#undef _
	L2_OUTACL_N_ERROR,
	} l2_outacl_error_t;

	static char *l2_outacl_error_strings[] = {
	#define _(sym,string) string,
	foreach_l2_outacl_error
	#undef _
	};


	static inline uword
	l2_in_out_acl_node_fn (vlib_main_t * vm,
	vlib_node_runtime_t * node, vlib_frame_t * frame,
	int is_output)
	{
	u32 n_left_from, from, to_next;
	acl_next_index_t next_index;
	l2_in_out_acl_main_t *msm = &l2_in_out_acl_main;
	in_out_acl_main_t *am = &in_out_acl_main;
	vnet_classify_main_t *vcm = am->vnet_classify_main;
	in_out_acl_table_id_t tid = IN_OUT_ACL_TABLE_L2;
	f64 now = vlib_time_now (vm);
	u32 hits = 0;
	u32 misses = 0;
	u32 chain_hits = 0;

	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors; /* number of packets to process */
	next_index = node->cached_next_index;

	/* First pass: compute hashes */
	while (n_left_from > 2)
	{
	vlib_buffer_t b0, b1;
	u32 bi0, bi1;
	u8 h0, h1;
	u32 sw_if_index0, sw_if_index1;
	u32 table_index0, table_index1;
	vnet_classify_table_t t0, t1;

	/* prefetch next iteration */
	{
	vlib_buffer_t p1, p2;

	p1 = vlib_get_buffer (vm, from[1]);
	p2 = vlib_get_buffer (vm, from[2]);

	vlib_prefetch_buffer_header (p1, STORE);
	clib_prefetch_store (p1->data);
	vlib_prefetch_buffer_header (p2, STORE);
	clib_prefetch_store (p2->data);
	}

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);

	bi1 = from[1];
	b1 = vlib_get_buffer (vm, bi1);

	sw_if_index0 =
	vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
	table_index0 =
	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index0];

	sw_if_index1 =
	vnet_buffer (b1)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
	table_index1 =
	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index1];

	t0 = pool_elt_at_index (vcm->tables, table_index0);

	t1 = pool_elt_at_index (vcm->tables, table_index1);

	if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
	h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
	else
	h0 = (void *) vlib_buffer_get_current (b0);

	vnet_buffer (b0)->l2_classify.hash =
	vnet_classify_hash_packet (t0, (u8 *) h0);

	vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

	if (t1->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
	h1 = (void *) vlib_buffer_get_current (b1) + t1->current_data_offset;
	else
	h1 = (void *) vlib_buffer_get_current (b1);

	vnet_buffer (b1)->l2_classify.hash =
	vnet_classify_hash_packet (t1, (u8 *) h1);

	vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);

	vnet_buffer (b0)->l2_classify.table_index = table_index0;

	vnet_buffer (b1)->l2_classify.table_index = table_index1;

	from += 2;
	n_left_from -= 2;
	}

	while (n_left_from > 0)
	{
	vlib_buffer_t *b0;
	u32 bi0;
	u8 *h0;
	u32 sw_if_index0;
	u32 table_index0;
	vnet_classify_table_t *t0;

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);

	sw_if_index0 =
	vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
	table_index0 =
	am->classify_table_index_by_sw_if_index[is_output][tid][sw_if_index0];

	t0 = pool_elt_at_index (vcm->tables, table_index0);

	if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
	h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
	else
	h0 = (void *) vlib_buffer_get_current (b0);

	vnet_buffer (b0)->l2_classify.hash =
	vnet_classify_hash_packet (t0, (u8 *) h0);

	vnet_buffer (b0)->l2_classify.table_index = table_index0;
	vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

	from++;
	n_left_from--;
	}

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

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

	/* Not enough load/store slots to dual loop... */
	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	vlib_buffer_t *b0;
	u32 next0 = ACL_NEXT_INDEX_DENY;
	u32 table_index0;
	vnet_classify_table_t *t0;
	vnet_classify_entry_t *e0;
	u32 hash0;
	u8 *h0;
	u8 error0;

	/* Stride 3 seems to work best */
	if (PREDICT_TRUE (n_left_from > 3))
	{
	vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
	vnet_classify_table_t *tp1;
	u32 table_index1;
	u32 phash1;

	table_index1 = vnet_buffer (p1)->l2_classify.table_index;

	if (PREDICT_TRUE (table_index1 != ~0))
	{
	tp1 = pool_elt_at_index (vcm->tables, table_index1);
	phash1 = vnet_buffer (p1)->l2_classify.hash;
	vnet_classify_prefetch_entry (tp1, phash1);
	}
	}

	/* speculatively enqueue b0 to the current next frame */
	bi0 = from[0];
	to_next[0] = bi0;
	from += 1;
	to_next += 1;
	n_left_from -= 1;
	n_left_to_next -= 1;

	b0 = vlib_get_buffer (vm, bi0);

	table_index0 = vnet_buffer (b0)->l2_classify.table_index;
	e0 = 0;
	t0 = 0;

	vnet_buffer (b0)->l2_classify.opaque_index = ~0;

	/* Determine the next node */
	next0 =
	vnet_l2_feature_next (b0, msm->feat_next_node_index[is_output],
	is_output ? L2OUTPUT_FEAT_ACL :
	L2INPUT_FEAT_ACL);

	if (PREDICT_TRUE (table_index0 != ~0))
	{
	hash0 = vnet_buffer (b0)->l2_classify.hash;
	t0 = pool_elt_at_index (vcm->tables, table_index0);

	if (t0->current_data_flag == CLASSIFY_FLAG_USE_CURR_DATA)
	h0 =
	(void *) vlib_buffer_get_current (b0) +
	t0->current_data_offset;
	else
	h0 = (void *) vlib_buffer_get_current (b0);

	e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
	if (e0)
	{
	vnet_buffer (b0)->l2_classify.opaque_index
	= e0->opaque_index;
	vlib_buffer_advance (b0, e0->advance);

	next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
	e0->next_index : next0;

	hits++;

	if (is_output)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_OUTACL_ERROR_SESSION_DENY : L2_INACL_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_OUTACL_ERROR_SESSION_DENY : L2_OUTACL_ERROR_NONE;
	b0->error = node->errors[error0];
	}
	else
	{
	while (1)
	{
	if (PREDICT_TRUE (t0->next_table_index != ~0))
	t0 = pool_elt_at_index (vcm->tables,
	t0->next_table_index);
	else
	{
	next0 =
	(t0->miss_next_index <
	ACL_NEXT_INDEX_N_NEXT) ? t0->miss_next_index :
	next0;

	misses++;

	if (is_output)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_OUTACL_ERROR_TABLE_MISS :
	L2_OUTACL_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_INACL_ERROR_TABLE_MISS : L2_INACL_ERROR_NONE;
	b0->error = node->errors[error0];
	break;
	}

	if (t0->current_data_flag ==
	CLASSIFY_FLAG_USE_CURR_DATA)
	h0 =
	(void *) vlib_buffer_get_current (b0) +
	t0->current_data_offset;
	else
	h0 = (void *) vlib_buffer_get_current (b0);

	hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
	e0 = vnet_classify_find_entry
	(t0, (u8 *) h0, hash0, now);
	if (e0)
	{
	vlib_buffer_advance (b0, e0->advance);
	next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
	e0->next_index : next0;
	hits++;
	chain_hits++;

	if (is_output)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_OUTACL_ERROR_SESSION_DENY :
	L2_OUTACL_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	L2_INACL_ERROR_SESSION_DENY :
	L2_INACL_ERROR_NONE;
	b0->error = node->errors[error0];
	break;
	}
	}
	}
	}

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	l2_in_out_acl_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index =
	vnet_buffer (b0)->sw_if_index[is_output ? VLIB_TX : VLIB_RX];
	t->next_index = next0;
	t->table_index = t0 ? t0 - vcm->tables : ~0;
	t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
	}

	/* verify speculative enqueue, maybe switch current next frame */
	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, node->node_index,
	is_output ? L2_OUTACL_ERROR_MISS :
	L2_INACL_ERROR_MISS, misses);
	vlib_node_increment_counter (vm, node->node_index,
	is_output ? L2_OUTACL_ERROR_HIT :
	L2_INACL_ERROR_HIT, hits);
	vlib_node_increment_counter (vm, node->node_index,
	is_output ? L2_OUTACL_ERROR_CHAIN_HIT :
	L2_INACL_ERROR_CHAIN_HIT, chain_hits);
	return frame->n_vectors;
	}

	VLIB_NODE_FN (l2_inacl_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return l2_in_out_acl_node_fn (vm, node, frame,
	IN_OUT_ACL_INPUT_TABLE_GROUP);
	}

	VLIB_NODE_FN (l2_outacl_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return l2_in_out_acl_node_fn (vm, node, frame,
	IN_OUT_ACL_OUTPUT_TABLE_GROUP);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (l2_inacl_node) = {
	.name = "l2-input-acl",
	.vector_size = sizeof (u32),
	.format_trace = format_l2_inacl_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(l2_inacl_error_strings),
	.error_strings = l2_inacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,

	/* edit / add dispositions here */
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "error-drop",
	},
	};

	VLIB_REGISTER_NODE (l2_outacl_node) = {
	.name = "l2-output-acl",
	.vector_size = sizeof (u32),
	.format_trace = format_l2_outacl_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(l2_outacl_error_strings),
	.error_strings = l2_outacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,

	/* edit / add dispositions here */
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "error-drop",
	},
	};
	/* INDENT-ON */


	#ifndef CLIB_MARCH_VARIANT
	clib_error_t *
	l2_in_out_acl_init (vlib_main_t * vm)
	{
	l2_in_out_acl_main_t *mp = &l2_in_out_acl_main;

	mp->vlib_main = vm;
	mp->vnet_main = vnet_get_main ();

	/* Initialize the feature next-node indexes */
	feat_bitmap_init_next_nodes (vm,
	l2_inacl_node.index,
	L2INPUT_N_FEAT,
	l2input_get_feat_names (),
	mp->feat_next_node_index
	[IN_OUT_ACL_INPUT_TABLE_GROUP]);
	feat_bitmap_init_next_nodes (vm, l2_outacl_node.index, L2OUTPUT_N_FEAT,
	l2output_get_feat_names (),
	mp->feat_next_node_index
	[IN_OUT_ACL_OUTPUT_TABLE_GROUP]);

	return 0;
	}

	VLIB_INIT_FUNCTION (l2_in_out_acl_init);
	#endif /* CLIB_MARCH_VARIANT */

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