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/*
 * 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.
 */
/*
 * error.h: drop/punt error packets
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef included_vlib_error_h
#define included_vlib_error_h

/* Combined 16 bit node & 16 bit code as 32 bit number. */
typedef u32 vlib_error_t;

always_inline u32
vlib_error_get_node (vlib_error_t e)
{
  return e >> 12;
}

always_inline u32
vlib_error_get_code (vlib_error_t e)
{
  return e & 0xfff;
}

always_inline vlib_error_t
vlib_error_set (u32 node_index, u32 code)
{
  ASSERT (node_index < (1 << 20));
  ASSERT (code < (1 << 12));
  return (node_index << 12) | code;
}

always_inline vlib_error_t
vlib_error_set_code (vlib_error_t e, u32 code)
{
  ASSERT (vlib_error_get_code (e) == 0);
  ASSERT (code < (1 << 12));
  e |= code;
  return e;
}

typedef struct
{
  /* Error counters. */
  u64 *counters;

  /* Counter values as of last counter clear. */
  u64 *counters_last_clear;

  /* Error name strings in heap.  Heap index
     indexes counter vector. */
  char **error_strings_heap;
} vlib_error_main_t;

/* Per node error registration. */
void vlib_register_errors (struct vlib_main_t *vm,
			   u32 node_index,
			   u32 n_errors, char *error_strings[]);

#endif /* included_vlib_error_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
lor: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */ }
/*
 * Copyright (c) 2016 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 <vppinfra/error.h>

#include <vnet/span/span.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/elog.h>

vlib_node_registration_t span_node;

/* packet trace format function */
u8 *
format_span_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 *);
  span_trace_t *t = va_arg (*args, span_trace_t *);

  vnet_main_t *vnm = &vnet_main;
  s = format (s, "SPAN: mirrored %U -> %U",
	      format_vnet_sw_if_index_name, vnm, t->src_sw_if_index,
	      format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index);

  return s;
}

#define foreach_span_error                      \
_(HITS, "SPAN incomming packets processed")

typedef enum
{
#define _(sym,str) SPAN_ERROR_##sym,
  foreach_span_error
#undef _
    SPAN_N_ERROR,
} span_error_t;

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

static_always_inline void
span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0,
	     vlib_buffer_t * b0, vlib_frame_t ** mirror_frames,
	     vlib_rx_or_tx_t rxtx, span_feat_t sf)
{
  vlib_buffer_t *c0;
  span_main_t *sm = &span_main;
  vnet_main_t *vnm = &vnet_main;
  u32 *to_mirror_next = 0;
  u32 i;

  span_interface_t *si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);
  span_mirror_t *sm0 = &si0->mirror_rxtx[sf][rxtx];

  if (sm0->num_mirror_ports == 0)
    return;

  /* Don't do it again */
  if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_SPAN_CLONE))
    return;

  /* *INDENT-OFF* */
  clib_bitmap_foreach (i, sm0->mirror_ports, (
    {
      if (mirror_frames[i] == 0)
        {
          if (sf == SPAN_FEAT_L2)
            mirror_frames[i] = vlib_get_frame_to_node (vnm->vlib_main,
						       l2output_node.index);
          else
            mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i);
	}
      to_mirror_next = vlib_frame_vector_args (mirror_frames[i]);
      to_mirror_next += mirror_frames[i]->n_vectors;
      /* This can fail */
      c0 = vlib_buffer_copy (vm, b0);
      if (PREDICT_TRUE(c0 != 0))
        {
          vnet_buffer (c0)->sw_if_index[VLIB_TX] = i;
          c0->flags |= VNET_BUFFER_F_SPAN_CLONE;
          if (sf == SPAN_FEAT_L2)
	    vnet_buffer (c0)->l2.feature_bitmap = L2OUTPUT_FEAT_OUTPUT;
          to_mirror_next[0] = vlib_get_buffer_index (vm, c0);
          mirror_frames[i]->n_vectors++;
          if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
              t->src_sw_if_index = sw_if_index0;
              t->mirror_sw_if_index = i;
#if 0
	      /* Enable this path to allow packet trace of SPAN packets.
	         Note that all SPAN packets will show up on the trace output
	         with the first SPAN packet (since they are in the same frame)
	         thus making trace output of the original packet confusing */
	      mirror_frames[i]->flags |= VLIB_FRAME_TRACE;
	      c0->flags |= VLIB_BUFFER_IS_TRACED;
#endif
	    }
	}
    }));
  /* *INDENT-ON* */
}

static_always_inline uword
span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
		     vlib_frame_t * frame, vlib_rx_or_tx_t rxtx,
		     span_feat_t sf)
{
  span_main_t *sm = &span_main;
  vnet_main_t *vnm = &vnet_main;
  u32 n_left_from, *from, *to_next;
  u32 n_span_packets = 0;
  u32 next_index;
  u32 sw_if_index;
  static __thread vlib_frame_t **mirror_frames = 0;

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

  vec_validate_aligned (mirror_frames, sm->max_sw_if_index,
			CLIB_CACHE_LINE_BYTES);

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

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

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

	  /* speculatively enqueue b0, b1 to the current next frame */
	  to_next[0] = bi0 = from[0];
	  to_next[1] = bi1 = from[1];
	  to_next += 2;
	  n_left_to_next -= 2;
	  from += 2;
	  n_left_from -= 2;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);
	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];
	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx];

	  span_mirror (vm, node, sw_if_index0, b0, mirror_frames, rxtx, sf);
	  span_mirror (vm, node, sw_if_index1, b1, mirror_frames, rxtx, sf);

	  switch (sf)
	    {
	    case SPAN_FEAT_L2:
	      if (rxtx == VLIB_RX)
		{
		  next0 = vnet_l2_feature_next (b0, sm->l2_input_next,
						L2INPUT_FEAT_SPAN);
		  next1 = vnet_l2_feature_next (b1, sm->l2_input_next,
						L2INPUT_FEAT_SPAN);
		}
	      else
		{
		  next0 = vnet_l2_feature_next (b0, sm->l2_output_next,
						L2OUTPUT_FEAT_SPAN);
		  next1 = vnet_l2_feature_next (b1, sm->l2_output_next,
						L2OUTPUT_FEAT_SPAN);
		}
	      break;
	    case SPAN_FEAT_DEVICE:
	    default:
	      vnet_feature_next (sw_if_index0, &next0, b0);
	      vnet_feature_next (sw_if_index1, &next1, b1);
	      break;
	    }

	  /* verify speculative enqueue, maybe switch current next frame */
	  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 sw_if_index0;
	  u32 next0 = 0;

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

	  b0 = vlib_get_buffer (vm, bi0);
	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];

	  span_mirror (vm, node, sw_if_index0, b0, mirror_frames, rxtx, sf);

	  switch (sf)
	    {
	    case SPAN_FEAT_L2:
	      if (rxtx == VLIB_RX)
		next0 = vnet_l2_feature_next (b0, sm->l2_input_next,
					      L2INPUT_FEAT_SPAN);
	      else
		next0 = vnet_l2_feature_next (b0, sm->l2_output_next,
					      L2OUTPUT_FEAT_SPAN);
	      break;
	    case SPAN_FEAT_DEVICE:
	    default:
	      vnet_feature_next (sw_if_index0, &next0, b0);
	      break;
	    }

	  /* 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);
    }


  for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++)
    {
      vlib_frame_t *f = mirror_frames[sw_if_index];
      if (f == 0)
	continue;

      if (sf == SPAN_FEAT_L2)
	vlib_put_frame_to_node (vnm->vlib_main, l2output_node.index, f);
      else
	vnet_put_frame_to_sw_interface (vnm, sw_if_index, f);
      mirror_frames[sw_if_index] = 0;
    }
  vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS,
			       n_span_packets);

  return frame->n_vectors;
}

static uword
span_device_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
			   vlib_frame_t * frame)
{
  return span_node_inline_fn (vm, node, frame, VLIB_RX, SPAN_FEAT_DEVICE);
}

static uword
span_device_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
			    vlib_frame_t * frame)
{
  return span_node_inline_fn (vm, node, frame, VLIB_TX, SPAN_FEAT_DEVICE);
}

static uword
span_l2_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
		       vlib_frame_t * frame)
{
  return span_node_inline_fn (vm, node, frame, VLIB_RX, SPAN_FEAT_L2);
}

static uword
span_l2_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
			vlib_frame_t * frame)
{
  return span_node_inline_fn (vm, node, frame, VLIB_TX, SPAN_FEAT_L2);
}

#define span_node_defs                           \
  .vector_size = sizeof (u32),                   \
  .format_trace = format_span_trace,             \
  .type = VLIB_NODE_TYPE_INTERNAL,               \
  .n_errors = ARRAY_LEN(span_error_strings),     \
  .error_strings = span_error_strings,           \
  .n_next_nodes = 0,                             \
  .next_nodes = {                                \
    [0] = "error-drop"                           \
  }

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (span_input_node) = {
  span_node_defs,
  .function = span_device_input_node_fn,
  .name = "span-input",
};

VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_device_input_node_fn)

VLIB_REGISTER_NODE (span_output_node) = {
  span_node_defs,
  .function = span_device_output_node_fn,
  .name = "span-output",
};

VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_device_output_node_fn)

VLIB_REGISTER_NODE (span_l2_input_node) = {
  span_node_defs,
  .function = span_l2_input_node_fn,
  .name = "span-l2-input",
};

VLIB_NODE_FUNCTION_MULTIARCH (span_l2_input_node, span_l2_input_node_fn)

VLIB_REGISTER_NODE (span_l2_output_node) = {
  span_node_defs,
  .function = span_l2_output_node_fn,
  .name = "span-l2-output",
};

VLIB_NODE_FUNCTION_MULTIARCH (span_l2_output_node, span_l2_output_node_fn)

clib_error_t *span_init (vlib_main_t * vm)
{
  span_main_t *sm = &span_main;

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

  /* Initialize the feature next-node indexes */
  feat_bitmap_init_next_nodes (vm,
			       span_l2_input_node.index,
			       L2INPUT_N_FEAT,
			       l2input_get_feat_names (),
			       sm->l2_input_next);

  feat_bitmap_init_next_nodes (vm,
			       span_l2_output_node.index,
			       L2OUTPUT_N_FEAT,
			       l2output_get_feat_names (),
			       sm->l2_output_next);
  return 0;
}

VLIB_INIT_FUNCTION (span_init);
/* *INDENT-ON* */

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