src/vnet/ip/ip_in_out_acl.c - 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.
  */
 #include <vnet/ip/ip.h>
 #include <vnet/classify/vnet_classify.h>
 #include <vnet/classify/in_out_acl.h>

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

 /* packet trace format function */
 static u8 *
 format_ip_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 *);
   ip_in_out_acl_trace_t *t = va_arg (*args, ip_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_ip_inacl_trace (u8 * s, va_list * args)
 {
   return format_ip_in_out_acl_trace (s, 0 /* is_output */ , args);
 }

 static u8 *
 format_ip_outacl_trace (u8 * s, va_list * args)
 {
   return format_ip_in_out_acl_trace (s, 1 /* is_output */ , args);
 }

 vlib_node_registration_t ip4_inacl_node;
 vlib_node_registration_t ip4_outacl_node;
 vlib_node_registration_t ip6_inacl_node;
 vlib_node_registration_t ip6_outacl_node;

 #define foreach_ip_inacl_error                  \
 _(MISS, "input ACL misses")                     \
 _(HIT, "input ACL hits")                        \
 _(CHAIN_HIT, "input ACL hits after chain walk")

 #define foreach_ip_outacl_error                  \
 _(MISS, "output ACL misses")                     \
 _(HIT, "output ACL hits")                        \
 _(CHAIN_HIT, "output ACL hits after chain walk")

 typedef enum
 {
 #define _(sym,str) IP_INACL_ERROR_##sym,
   foreach_ip_inacl_error
 #undef _
     IP_INACL_N_ERROR,
 } ip_inacl_error_t;

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

 typedef enum
 {
 #define _(sym,str) IP_OUTACL_ERROR_##sym,
   foreach_ip_outacl_error
 #undef _
     IP_OUTACL_N_ERROR,
 } ip_outacl_error_t;

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

 static inline uword
 ip_in_out_acl_inline (vlib_main_t * vm,
 		      vlib_node_runtime_t * node, vlib_frame_t * frame,
 		      int is_ip4, int is_output)
 {
   u32 n_left_from, *from, *to_next;
   acl_next_index_t next_index;
   in_out_acl_main_t *am = &in_out_acl_main;
   vnet_classify_main_t *vcm = am->vnet_classify_main;
   f64 now = vlib_time_now (vm);
   u32 hits = 0;
   u32 misses = 0;
   u32 chain_hits = 0;
   in_out_acl_table_id_t tid;
   vlib_node_runtime_t *error_node;
   u32 n_next_nodes;

   n_next_nodes = node->n_next_nodes;

   if (is_ip4)
     {
       tid = IN_OUT_ACL_TABLE_IP4;
       error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
     }
   else
     {
       tid = IN_OUT_ACL_TABLE_IP6;
       error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
     }

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

   /* 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 (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
 	vlib_prefetch_buffer_header (p2, STORE);
 	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
       }

       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 = b0->data;

       if (is_output)
 	{
 	  /* Save the rewrite length, since we are using the l2_classify struct */
 	  vnet_buffer (b0)->l2_classify.pad.l2_len =
 	    vnet_buffer (b0)->ip.save_rewrite_length;
 	  /* advance the match pointer so the matching happens on IP header */
 	  h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;
 	}

       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 = b1->data;

       if (is_output)
 	{
 	  /* Save the rewrite length, since we are using the l2_classify struct */
 	  vnet_buffer (b1)->l2_classify.pad.l2_len =
 	    vnet_buffer (b1)->ip.save_rewrite_length;
 	  /* advance the match pointer so the matching happens on IP header */
 	  h1 += vnet_buffer (b1)->l2_classify.pad.l2_len;
 	}

       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 = b0->data;

       if (is_output)
 	{
 	  /* Save the rewrite length, since we are using the l2_classify struct */
 	  vnet_buffer (b0)->l2_classify.pad.l2_len =
 	    vnet_buffer (b0)->ip.save_rewrite_length;
 	  /* advance the match pointer so the matching happens on IP header */
 	  h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;
 	}

       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;
 	  u64 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;
 	      u64 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_get_config_data (am->vnet_config_main[is_output][tid],
 				&b0->current_config_index, &next0,
 				/* # bytes of config data */ 0);

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

 	  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 = b0->data;

 	      /* advance the match pointer so the matching happens on IP header */
 	      if (is_output)
 		h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;

 	      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 < n_next_nodes) ?
 		    e0->next_index : next0;

 		  hits++;

 		  if (is_ip4)
 		    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 		      (is_output ? IP4_ERROR_OUTACL_SESSION_DENY :
 		       IP4_ERROR_INACL_SESSION_DENY) : IP4_ERROR_NONE;
 		  else
 		    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 		      (is_output ? IP6_ERROR_OUTACL_SESSION_DENY :
 		       IP6_ERROR_INACL_SESSION_DENY) : IP6_ERROR_NONE;
 		  b0->error = error_node->errors[error0];

 		  if (!is_output)
 		    {
 		      if (e0->action == CLASSIFY_ACTION_SET_IP4_FIB_INDEX ||
 			  e0->action == CLASSIFY_ACTION_SET_IP6_FIB_INDEX)
 			vnet_buffer (b0)->sw_if_index[VLIB_TX] = e0->metadata;
 		      else if (e0->action == CLASSIFY_ACTION_SET_METADATA)
 			vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
 			  e0->metadata;
 		    }
 		}
 	      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 < n_next_nodes) ?
 			    t0->miss_next_index : next0;

 			  misses++;

 			  if (is_ip4)
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      (is_output ? IP4_ERROR_OUTACL_TABLE_MISS :
 			       IP4_ERROR_INACL_TABLE_MISS) : IP4_ERROR_NONE;
 			  else
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      (is_output ? IP6_ERROR_OUTACL_TABLE_MISS :
 			       IP6_ERROR_INACL_TABLE_MISS) : IP6_ERROR_NONE;
 			  b0->error = 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 = b0->data;

 		      /* advance the match pointer so the matching happens on IP header */
 		      if (is_output)
 			h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;

 		      hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
 		      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 < n_next_nodes) ?
 			    e0->next_index : next0;
 			  hits++;
 			  chain_hits++;

 			  if (is_ip4)
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      (is_output ? IP4_ERROR_OUTACL_SESSION_DENY :
 			       IP4_ERROR_INACL_SESSION_DENY) : IP4_ERROR_NONE;
 			  else
 			    error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
 			      (is_output ? IP6_ERROR_OUTACL_SESSION_DENY :
 			       IP6_ERROR_INACL_SESSION_DENY) : IP6_ERROR_NONE;
 			  b0->error = error_node->errors[error0];

 			  if (!is_output)
 			    {
 			      if (e0->action ==
 				  CLASSIFY_ACTION_SET_IP4_FIB_INDEX
 				  || e0->action ==
 				  CLASSIFY_ACTION_SET_IP6_FIB_INDEX)
 				vnet_buffer (b0)->sw_if_index[VLIB_TX] =
 				  e0->metadata;
 			      else if (e0->action ==
 				       CLASSIFY_ACTION_SET_METADATA)
 				vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
 				  e0->metadata;
 			    }
 			  break;
 			}
 		    }
 		}
 	    }

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      ip_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 = (e0 && t0) ? vnet_classify_get_offset (t0, e0) : ~0;
 	    }

 	  if ((next0 == ACL_NEXT_INDEX_DENY) && is_output)
 	    {
 	      /* on output, for the drop node to work properly, go back to ip header */
 	      vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len);
 	    }

 	  /* 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 ? IP_OUTACL_ERROR_MISS :
 			       IP_INACL_ERROR_MISS, misses);
   vlib_node_increment_counter (vm, node->node_index,
 			       is_output ? IP_OUTACL_ERROR_HIT :
 			       IP_INACL_ERROR_HIT, hits);
   vlib_node_increment_counter (vm, node->node_index,
 			       is_output ? IP_OUTACL_ERROR_CHAIN_HIT :
 			       IP_INACL_ERROR_CHAIN_HIT, chain_hits);
   return frame->n_vectors;
 }

 static uword
 ip4_inacl (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 {
   return ip_in_out_acl_inline (vm, node, frame, 1 /* is_ip4 */ ,
 			       0 /* is_output */ );
 }

 static uword
 ip4_outacl (vlib_main_t * vm, vlib_node_runtime_t * node,
 	    vlib_frame_t * frame)
 {
   return ip_in_out_acl_inline (vm, node, frame, 1 /* is_ip4 */ ,
 			       1 /* is_output */ );
 }


 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip4_inacl_node) = {
   .function = ip4_inacl,
   .name = "ip4-inacl",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_inacl_trace,
   .n_errors = ARRAY_LEN(ip_inacl_error_strings),
   .error_strings = ip_inacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [ACL_NEXT_INDEX_DENY] = "ip4-drop",
   },
 };

 VLIB_REGISTER_NODE (ip4_outacl_node) = {
   .function = ip4_outacl,
   .name = "ip4-outacl",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_outacl_trace,
   .n_errors = ARRAY_LEN(ip_outacl_error_strings),
   .error_strings = ip_outacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [ACL_NEXT_INDEX_DENY] = "ip4-drop",
   },
 };
 /* *INDENT-ON* */

 VLIB_NODE_FUNCTION_MULTIARCH (ip4_inacl_node, ip4_inacl);
 VLIB_NODE_FUNCTION_MULTIARCH (ip4_outacl_node, ip4_outacl);

 static uword
 ip6_inacl (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 {
   return ip_in_out_acl_inline (vm, node, frame, 0 /* is_ip4 */ ,
 			       0 /* is_output */ );
 }

 static uword
 ip6_outacl (vlib_main_t * vm, vlib_node_runtime_t * node,
 	    vlib_frame_t * frame)
 {
   return ip_in_out_acl_inline (vm, node, frame, 0 /* is_ip4 */ ,
 			       1 /* is_output */ );
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip6_inacl_node) = {
   .function = ip6_inacl,
   .name = "ip6-inacl",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_inacl_trace,
   .n_errors = ARRAY_LEN(ip_inacl_error_strings),
   .error_strings = ip_inacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [ACL_NEXT_INDEX_DENY] = "ip6-drop",
   },
 };

 VLIB_REGISTER_NODE (ip6_outacl_node) = {
   .function = ip6_outacl,
   .name = "ip6-outacl",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_outacl_trace,
   .n_errors = ARRAY_LEN(ip_outacl_error_strings),
   .error_strings = ip_outacl_error_strings,

   .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [ACL_NEXT_INDEX_DENY] = "ip6-drop",
   },
 };
 /* *INDENT-ON* */

 VLIB_NODE_FUNCTION_MULTIARCH (ip6_inacl_node, ip6_inacl);
 VLIB_NODE_FUNCTION_MULTIARCH (ip6_outacl_node, ip6_outacl);

 static clib_error_t *
 ip_in_out_acl_init (vlib_main_t * vm)
 {
   return 0;
 }

 VLIB_INIT_FUNCTION (ip_in_out_acl_init);


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

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

	/* packet trace format function */
	static u8 *
	format_ip_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 );
	ip_in_out_acl_trace_t t = va_arg (args, ip_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_ip_inacl_trace (u8 * s, va_list * args)
	{
	return format_ip_in_out_acl_trace (s, 0 /* is_output */ , args);
	}

	static u8 *
	format_ip_outacl_trace (u8 * s, va_list * args)
	{
	return format_ip_in_out_acl_trace (s, 1 /* is_output */ , args);
	}

	vlib_node_registration_t ip4_inacl_node;
	vlib_node_registration_t ip4_outacl_node;
	vlib_node_registration_t ip6_inacl_node;
	vlib_node_registration_t ip6_outacl_node;

	#define foreach_ip_inacl_error \
	_(MISS, "input ACL misses") \
	_(HIT, "input ACL hits") \
	_(CHAIN_HIT, "input ACL hits after chain walk")

	#define foreach_ip_outacl_error \
	_(MISS, "output ACL misses") \
	_(HIT, "output ACL hits") \
	_(CHAIN_HIT, "output ACL hits after chain walk")

	typedef enum
	{
	#define _(sym,str) IP_INACL_ERROR_##sym,
	foreach_ip_inacl_error
	#undef _
	IP_INACL_N_ERROR,
	} ip_inacl_error_t;

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

	typedef enum
	{
	#define _(sym,str) IP_OUTACL_ERROR_##sym,
	foreach_ip_outacl_error
	#undef _
	IP_OUTACL_N_ERROR,
	} ip_outacl_error_t;

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

	static inline uword
	ip_in_out_acl_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node, vlib_frame_t * frame,
	int is_ip4, int is_output)
	{
	u32 n_left_from, from, to_next;
	acl_next_index_t next_index;
	in_out_acl_main_t *am = &in_out_acl_main;
	vnet_classify_main_t *vcm = am->vnet_classify_main;
	f64 now = vlib_time_now (vm);
	u32 hits = 0;
	u32 misses = 0;
	u32 chain_hits = 0;
	in_out_acl_table_id_t tid;
	vlib_node_runtime_t *error_node;
	u32 n_next_nodes;

	n_next_nodes = node->n_next_nodes;

	if (is_ip4)
	{
	tid = IN_OUT_ACL_TABLE_IP4;
	error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
	}
	else
	{
	tid = IN_OUT_ACL_TABLE_IP6;
	error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
	}

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

	/* 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 (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
	vlib_prefetch_buffer_header (p2, STORE);
	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

	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 = b0->data;

	if (is_output)
	{
	/* Save the rewrite length, since we are using the l2_classify struct */
	vnet_buffer (b0)->l2_classify.pad.l2_len =
	vnet_buffer (b0)->ip.save_rewrite_length;
	/* advance the match pointer so the matching happens on IP header */
	h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;
	}

	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 = b1->data;

	if (is_output)
	{
	/* Save the rewrite length, since we are using the l2_classify struct */
	vnet_buffer (b1)->l2_classify.pad.l2_len =
	vnet_buffer (b1)->ip.save_rewrite_length;
	/* advance the match pointer so the matching happens on IP header */
	h1 += vnet_buffer (b1)->l2_classify.pad.l2_len;
	}

	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 = b0->data;

	if (is_output)
	{
	/* Save the rewrite length, since we are using the l2_classify struct */
	vnet_buffer (b0)->l2_classify.pad.l2_len =
	vnet_buffer (b0)->ip.save_rewrite_length;
	/* advance the match pointer so the matching happens on IP header */
	h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;
	}

	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;
	u64 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;
	u64 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_get_config_data (am->vnet_config_main[is_output][tid],
	&b0->current_config_index, &next0,
	/* # bytes of config data */ 0);

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

	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 = b0->data;

	/* advance the match pointer so the matching happens on IP header */
	if (is_output)
	h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;

	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 < n_next_nodes) ?
	e0->next_index : next0;

	hits++;

	if (is_ip4)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP4_ERROR_OUTACL_SESSION_DENY :
	IP4_ERROR_INACL_SESSION_DENY) : IP4_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP6_ERROR_OUTACL_SESSION_DENY :
	IP6_ERROR_INACL_SESSION_DENY) : IP6_ERROR_NONE;
	b0->error = error_node->errors[error0];

	if (!is_output)
	{
	if (e0->action == CLASSIFY_ACTION_SET_IP4_FIB_INDEX \|\|
	e0->action == CLASSIFY_ACTION_SET_IP6_FIB_INDEX)
	vnet_buffer (b0)->sw_if_index[VLIB_TX] = e0->metadata;
	else if (e0->action == CLASSIFY_ACTION_SET_METADATA)
	vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
	e0->metadata;
	}
	}
	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 < n_next_nodes) ?
	t0->miss_next_index : next0;

	misses++;

	if (is_ip4)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP4_ERROR_OUTACL_TABLE_MISS :
	IP4_ERROR_INACL_TABLE_MISS) : IP4_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP6_ERROR_OUTACL_TABLE_MISS :
	IP6_ERROR_INACL_TABLE_MISS) : IP6_ERROR_NONE;
	b0->error = 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 = b0->data;

	/* advance the match pointer so the matching happens on IP header */
	if (is_output)
	h0 += vnet_buffer (b0)->l2_classify.pad.l2_len;

	hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
	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 < n_next_nodes) ?
	e0->next_index : next0;
	hits++;
	chain_hits++;

	if (is_ip4)
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP4_ERROR_OUTACL_SESSION_DENY :
	IP4_ERROR_INACL_SESSION_DENY) : IP4_ERROR_NONE;
	else
	error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
	(is_output ? IP6_ERROR_OUTACL_SESSION_DENY :
	IP6_ERROR_INACL_SESSION_DENY) : IP6_ERROR_NONE;
	b0->error = error_node->errors[error0];

	if (!is_output)
	{
	if (e0->action ==
	CLASSIFY_ACTION_SET_IP4_FIB_INDEX
	\|\| e0->action ==
	CLASSIFY_ACTION_SET_IP6_FIB_INDEX)
	vnet_buffer (b0)->sw_if_index[VLIB_TX] =
	e0->metadata;
	else if (e0->action ==
	CLASSIFY_ACTION_SET_METADATA)
	vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
	e0->metadata;
	}
	break;
	}
	}
	}
	}

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	ip_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 = (e0 && t0) ? vnet_classify_get_offset (t0, e0) : ~0;
	}

	if ((next0 == ACL_NEXT_INDEX_DENY) && is_output)
	{
	/* on output, for the drop node to work properly, go back to ip header */
	vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len);
	}

	/* 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 ? IP_OUTACL_ERROR_MISS :
	IP_INACL_ERROR_MISS, misses);
	vlib_node_increment_counter (vm, node->node_index,
	is_output ? IP_OUTACL_ERROR_HIT :
	IP_INACL_ERROR_HIT, hits);
	vlib_node_increment_counter (vm, node->node_index,
	is_output ? IP_OUTACL_ERROR_CHAIN_HIT :
	IP_INACL_ERROR_CHAIN_HIT, chain_hits);
	return frame->n_vectors;
	}

	static uword
	ip4_inacl (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
	{
	return ip_in_out_acl_inline (vm, node, frame, 1 /* is_ip4 */ ,
	0 /* is_output */ );
	}

	static uword
	ip4_outacl (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return ip_in_out_acl_inline (vm, node, frame, 1 /* is_ip4 */ ,
	1 /* is_output */ );
	}


	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ip4_inacl_node) = {
	.function = ip4_inacl,
	.name = "ip4-inacl",
	.vector_size = sizeof (u32),
	.format_trace = format_ip_inacl_trace,
	.n_errors = ARRAY_LEN(ip_inacl_error_strings),
	.error_strings = ip_inacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "ip4-drop",
	},
	};

	VLIB_REGISTER_NODE (ip4_outacl_node) = {
	.function = ip4_outacl,
	.name = "ip4-outacl",
	.vector_size = sizeof (u32),
	.format_trace = format_ip_outacl_trace,
	.n_errors = ARRAY_LEN(ip_outacl_error_strings),
	.error_strings = ip_outacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "ip4-drop",
	},
	};
	/* INDENT-ON */

	VLIB_NODE_FUNCTION_MULTIARCH (ip4_inacl_node, ip4_inacl);
	VLIB_NODE_FUNCTION_MULTIARCH (ip4_outacl_node, ip4_outacl);

	static uword
	ip6_inacl (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
	{
	return ip_in_out_acl_inline (vm, node, frame, 0 /* is_ip4 */ ,
	0 /* is_output */ );
	}

	static uword
	ip6_outacl (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return ip_in_out_acl_inline (vm, node, frame, 0 /* is_ip4 */ ,
	1 /* is_output */ );
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ip6_inacl_node) = {
	.function = ip6_inacl,
	.name = "ip6-inacl",
	.vector_size = sizeof (u32),
	.format_trace = format_ip_inacl_trace,
	.n_errors = ARRAY_LEN(ip_inacl_error_strings),
	.error_strings = ip_inacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "ip6-drop",
	},
	};

	VLIB_REGISTER_NODE (ip6_outacl_node) = {
	.function = ip6_outacl,
	.name = "ip6-outacl",
	.vector_size = sizeof (u32),
	.format_trace = format_ip_outacl_trace,
	.n_errors = ARRAY_LEN(ip_outacl_error_strings),
	.error_strings = ip_outacl_error_strings,

	.n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[ACL_NEXT_INDEX_DENY] = "ip6-drop",
	},
	};
	/* INDENT-ON */

	VLIB_NODE_FUNCTION_MULTIARCH (ip6_inacl_node, ip6_inacl);
	VLIB_NODE_FUNCTION_MULTIARCH (ip6_outacl_node, ip6_outacl);

	static clib_error_t *
	ip_in_out_acl_init (vlib_main_t * vm)
	{
	return 0;
	}

	VLIB_INIT_FUNCTION (ip_in_out_acl_init);


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