src/vnet/l2/l2_output_acl.c - fdio/vpp - Gitiles

 /*
  * l2_output_acl.c : layer 2 output acl processing
  *
  * Copyright (c) 2013 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/pg/pg.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/feat_bitmap.h>
 #include <vnet/l2/l2_output.h>

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


 typedef struct
 {
   /* Next nodes for features and output interfaces */
   l2_output_next_nodes_st next_nodes;

   /* convenience variables */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
 } l2_outacl_main_t;


 typedef struct
 {
   /* per-pkt trace data */
   u8 src[6];
   u8 dst[6];
   u32 next_index;
   u32 sw_if_index;
 } l2_outacl_trace_t;

 /* packet trace format function */
 static u8 *
 format_l2_outacl_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 *);
   l2_outacl_trace_t *t = va_arg (*args, l2_outacl_trace_t *);

   s = format (s, "l2-output-acl: sw_if_index %d dst %U src %U",
 	      t->sw_if_index,
 	      format_ethernet_address, t->dst,
 	      format_ethernet_address, t->src);
   return s;
 }

 l2_outacl_main_t l2_outacl_main;

 static vlib_node_registration_t l2_outacl_node;

 #define foreach_l2_outacl_error			\
 _(L2_OUTACL,    "L2 output ACL packets")	\
 _(DROP,         "L2 output drops")

 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 _
 };

 typedef enum
 {
   L2_OUTACL_NEXT_DROP,
   L2_OUTACL_N_NEXT,
 } l2_outacl_next_t;


 static uword
 l2_outacl_node_fn (vlib_main_t * vm,
 		   vlib_node_runtime_t * node, vlib_frame_t * frame)
 {
   u32 n_left_from, *from, *to_next;
   l2_outacl_next_t next_index;
   l2_outacl_main_t *msm = &l2_outacl_main;
   vlib_node_t *n = vlib_get_node (vm, l2_outacl_node.index);
   u32 node_counter_base_index = n->error_heap_index;
   vlib_error_main_t *em = &vm->error_main;
   u32 cached_sw_if_index = (u32) ~ 0;
   u32 cached_next_index = (u32) ~ 0;

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

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       /* get space to enqueue frame to graph node "next_index" */
       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

       while (0 && n_left_from >= 4 && n_left_to_next >= 2)
 	{
 	  u32 bi0, bi1;
 	  vlib_buffer_t *b0, *b1;
 	  u32 next0, next1;
 	  u32 sw_if_index0, sw_if_index1;
 	  ethernet_header_t *h0, *h1;

 	  /* Prefetch next iteration. */
 	  {
 	    vlib_buffer_t *p2, *p3;

 	    p2 = vlib_get_buffer (vm, from[2]);
 	    p3 = vlib_get_buffer (vm, from[3]);

 	    vlib_prefetch_buffer_header (p2, LOAD);
 	    vlib_prefetch_buffer_header (p3, LOAD);

 	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 	  }

 	  /* speculatively enqueue b0 and b1 to the current next frame */
 	  /* bi is "buffer index", b is pointer to the buffer */
 	  to_next[0] = bi0 = from[0];
 	  to_next[1] = bi1 = from[1];
 	  from += 2;
 	  to_next += 2;
 	  n_left_from -= 2;
 	  n_left_to_next -= 2;

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

 	  /* TX interface handles */
 	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
 	    {
 	      if (b0->flags & VLIB_BUFFER_IS_TRACED)
 		{
 		  l2_outacl_trace_t *t =
 		    vlib_add_trace (vm, node, b0, sizeof (*t));
 		  t->sw_if_index = sw_if_index0;
 		  t->next_index = next0;
 		  clib_memcpy (t->src, h0->src_address, 6);
 		  clib_memcpy (t->dst, h0->dst_address, 6);
 		}
 	      if (b1->flags & VLIB_BUFFER_IS_TRACED)
 		{
 		  l2_outacl_trace_t *t =
 		    vlib_add_trace (vm, node, b1, sizeof (*t));
 		  t->sw_if_index = sw_if_index1;
 		  t->next_index = next1;
 		  clib_memcpy (t->src, h1->src_address, 6);
 		  clib_memcpy (t->dst, h1->dst_address, 6);
 		}
 	    }

 	  em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
 	    2;

 	  /* add core loop code here */

 	  /* verify speculative enqueues, maybe switch current next frame */
 	  /* if next0==next1==next_index then nothing special needs to be done */
 	  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)
 	{
 	  u32 bi0;
 	  vlib_buffer_t *b0;
 	  u32 next0;
 	  u32 sw_if_index0;
 	  ethernet_header_t *h0;
 	  u32 feature_bitmap0;

 	  /* 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);
 	  h0 = vlib_buffer_get_current (b0);

 	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      l2_outacl_trace_t *t =
 		vlib_add_trace (vm, node, b0, sizeof (*t));
 	      t->sw_if_index = sw_if_index0;
 	      clib_memcpy (t->src, h0->src_address, 6);
 	      clib_memcpy (t->dst, h0->dst_address, 6);
 	    }

 	  em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
 	    1;

 	  /*
 	   * L2_OUTACL code
 	   * Dummy for now, just go to next feature node
 	   */


 	  /* Remove ourself from the feature bitmap */
 	  feature_bitmap0 =
 	    vnet_buffer (b0)->l2.feature_bitmap & ~L2OUTPUT_FEAT_ACL;

 	  /* Determine next node */
 	  l2_output_dispatch (msm->vlib_main,
 			      msm->vnet_main,
 			      node,
 			      l2_outacl_node.index,
 			      &cached_sw_if_index,
 			      &cached_next_index,
 			      &msm->next_nodes,
 			      b0, sw_if_index0, feature_bitmap0, &next0);

 	  /* 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);
     }

   return frame->n_vectors;
 }


 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (l2_outacl_node,static) = {
   .function = l2_outacl_node_fn,
   .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 = L2_OUTACL_N_NEXT,

   /* edit / add dispositions here */
   .next_nodes = {
        [L2_OUTACL_NEXT_DROP]  = "error-drop",
   },
 };
 /* *INDENT-ON* */

 VLIB_NODE_FUNCTION_MULTIARCH (l2_outacl_node, l2_outacl_node_fn)
      clib_error_t *l2_outacl_init (vlib_main_t * vm)
 {
   l2_outacl_main_t *mp = &l2_outacl_main;

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

   /* Initialize the feature next-node indexes */
   feat_bitmap_init_next_nodes (vm,
 			       l2_outacl_node.index,
 			       L2OUTPUT_N_FEAT,
 			       l2output_get_feat_names (),
 			       mp->next_nodes.feat_next_node_index);

   /* Initialize the output node mapping table */
   l2output_init_output_node_vec (&mp->next_nodes.output_node_index_vec);

   return 0;
 }

 VLIB_INIT_FUNCTION (l2_outacl_init);

 #if 0
 /** @todo maybe someone will add output ACL's in the future.
  * Set subinterface outacl enable/disable.
  * The CLI format is:
  *    set interface acl output <interface> [disable]
  */
 static clib_error_t *
 int_l2_outacl (vlib_main_t * vm,
 	       unformat_input_t * input, vlib_cli_command_t * cmd)
 {
   vnet_main_t *vnm = vnet_get_main ();
   clib_error_t *error = 0;
   u32 sw_if_index;
   u32 enable;

   if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
     {
       error = clib_error_return (0, "unknown interface `%U'",
 				 format_unformat_error, input);
       goto done;
     }

   enable = 1;
   if (unformat (input, "disable"))
     {
       enable = 0;
     }

   /* set the interface flag */
   l2output_intf_bitmap_enable (sw_if_index, L2OUTPUT_FEAT_ACL, enable);

 done:
   return error;
 }

 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (int_l2_outacl_cli, static) = {
   .path = "set interface acl output",
   .short_help = "set interface acl output <interface> [disable]",
   .function = int_l2_outacl,
 };
 /* *INDENT-ON* */
 #endif

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* l2_output_acl.c : layer 2 output acl processing
	*
	* Copyright (c) 2013 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/pg/pg.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/feat_bitmap.h>
	#include <vnet/l2/l2_output.h>

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


	typedef struct
	{
	/* Next nodes for features and output interfaces */
	l2_output_next_nodes_st next_nodes;

	/* convenience variables */
	vlib_main_t *vlib_main;
	vnet_main_t *vnet_main;
	} l2_outacl_main_t;



	typedef struct
	{
	/* per-pkt trace data */
	u8 src[6];
	u8 dst[6];
	u32 next_index;
	u32 sw_if_index;
	} l2_outacl_trace_t;

	/* packet trace format function */
	static u8 *
	format_l2_outacl_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 );
	l2_outacl_trace_t t = va_arg (args, l2_outacl_trace_t *);

	s = format (s, "l2-output-acl: sw_if_index %d dst %U src %U",
	t->sw_if_index,
	format_ethernet_address, t->dst,
	format_ethernet_address, t->src);
	return s;
	}

	l2_outacl_main_t l2_outacl_main;

	static vlib_node_registration_t l2_outacl_node;

	#define foreach_l2_outacl_error \
	_(L2_OUTACL, "L2 output ACL packets") \
	_(DROP, "L2 output drops")

	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 _
	};

	typedef enum
	{
	L2_OUTACL_NEXT_DROP,
	L2_OUTACL_N_NEXT,
	} l2_outacl_next_t;



	static uword
	l2_outacl_node_fn (vlib_main_t * vm,
	vlib_node_runtime_t * node, vlib_frame_t * frame)
	{
	u32 n_left_from, from, to_next;
	l2_outacl_next_t next_index;
	l2_outacl_main_t *msm = &l2_outacl_main;
	vlib_node_t *n = vlib_get_node (vm, l2_outacl_node.index);
	u32 node_counter_base_index = n->error_heap_index;
	vlib_error_main_t *em = &vm->error_main;
	u32 cached_sw_if_index = (u32) ~ 0;
	u32 cached_next_index = (u32) ~ 0;

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

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	/* get space to enqueue frame to graph node "next_index" */
	vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

	while (0 && n_left_from >= 4 && n_left_to_next >= 2)
	{
	u32 bi0, bi1;
	vlib_buffer_t b0, b1;
	u32 next0, next1;
	u32 sw_if_index0, sw_if_index1;
	ethernet_header_t h0, h1;

	/* Prefetch next iteration. */
	{
	vlib_buffer_t p2, p3;

	p2 = vlib_get_buffer (vm, from[2]);
	p3 = vlib_get_buffer (vm, from[3]);

	vlib_prefetch_buffer_header (p2, LOAD);
	vlib_prefetch_buffer_header (p3, LOAD);

	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

	/* speculatively enqueue b0 and b1 to the current next frame */
	/* bi is "buffer index", b is pointer to the buffer */
	to_next[0] = bi0 = from[0];
	to_next[1] = bi1 = from[1];
	from += 2;
	to_next += 2;
	n_left_from -= 2;
	n_left_to_next -= 2;

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

	/* TX interface handles */
	sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
	sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
	{
	if (b0->flags & VLIB_BUFFER_IS_TRACED)
	{
	l2_outacl_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = sw_if_index0;
	t->next_index = next0;
	clib_memcpy (t->src, h0->src_address, 6);
	clib_memcpy (t->dst, h0->dst_address, 6);
	}
	if (b1->flags & VLIB_BUFFER_IS_TRACED)
	{
	l2_outacl_trace_t *t =
	vlib_add_trace (vm, node, b1, sizeof (*t));
	t->sw_if_index = sw_if_index1;
	t->next_index = next1;
	clib_memcpy (t->src, h1->src_address, 6);
	clib_memcpy (t->dst, h1->dst_address, 6);
	}
	}

	em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
	2;

	/* add core loop code here */

	/* verify speculative enqueues, maybe switch current next frame */
	/* if next0==next1==next_index then nothing special needs to be done */
	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)
	{
	u32 bi0;
	vlib_buffer_t *b0;
	u32 next0;
	u32 sw_if_index0;
	ethernet_header_t *h0;
	u32 feature_bitmap0;

	/* 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);
	h0 = vlib_buffer_get_current (b0);

	sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	l2_outacl_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = sw_if_index0;
	clib_memcpy (t->src, h0->src_address, 6);
	clib_memcpy (t->dst, h0->dst_address, 6);
	}

	em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
	1;

	/*
	* L2_OUTACL code
	* Dummy for now, just go to next feature node
	*/


	/* Remove ourself from the feature bitmap */
	feature_bitmap0 =
	vnet_buffer (b0)->l2.feature_bitmap & ~L2OUTPUT_FEAT_ACL;

	/* Determine next node */
	l2_output_dispatch (msm->vlib_main,
	msm->vnet_main,
	node,
	l2_outacl_node.index,
	&cached_sw_if_index,
	&cached_next_index,
	&msm->next_nodes,
	b0, sw_if_index0, feature_bitmap0, &next0);

	/* 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);
	}

	return frame->n_vectors;
	}


	/* INDENT-OFF */
	VLIB_REGISTER_NODE (l2_outacl_node,static) = {
	.function = l2_outacl_node_fn,
	.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 = L2_OUTACL_N_NEXT,

	/* edit / add dispositions here */
	.next_nodes = {
	[L2_OUTACL_NEXT_DROP] = "error-drop",
	},
	};
	/* INDENT-ON */

	VLIB_NODE_FUNCTION_MULTIARCH (l2_outacl_node, l2_outacl_node_fn)
	clib_error_t l2_outacl_init (vlib_main_t vm)
	{
	l2_outacl_main_t *mp = &l2_outacl_main;

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

	/* Initialize the feature next-node indexes */
	feat_bitmap_init_next_nodes (vm,
	l2_outacl_node.index,
	L2OUTPUT_N_FEAT,
	l2output_get_feat_names (),
	mp->next_nodes.feat_next_node_index);

	/* Initialize the output node mapping table */
	l2output_init_output_node_vec (&mp->next_nodes.output_node_index_vec);

	return 0;
	}

	VLIB_INIT_FUNCTION (l2_outacl_init);

	#if 0
	/** @todo maybe someone will add output ACL's in the future.
	* Set subinterface outacl enable/disable.
	* The CLI format is:
	* set interface acl output <interface> [disable]
	*/
	static clib_error_t *
	int_l2_outacl (vlib_main_t * vm,
	unformat_input_t * input, vlib_cli_command_t * cmd)
	{
	vnet_main_t *vnm = vnet_get_main ();
	clib_error_t *error = 0;
	u32 sw_if_index;
	u32 enable;

	if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
	{
	error = clib_error_return (0, "unknown interface `%U'",
	format_unformat_error, input);
	goto done;
	}

	enable = 1;
	if (unformat (input, "disable"))
	{
	enable = 0;
	}

	/* set the interface flag */
	l2output_intf_bitmap_enable (sw_if_index, L2OUTPUT_FEAT_ACL, enable);

	done:
	return error;
	}

	/* INDENT-OFF */
	VLIB_CLI_COMMAND (int_l2_outacl_cli, static) = {
	.path = "set interface acl output",
	.short_help = "set interface acl output <interface> [disable]",
	.function = int_l2_outacl,
	};
	/* INDENT-ON */
	#endif

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