/*
 * node.c: udp packet processing
 *
 * Copyright (c) 2013-2019 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/pg/pg.h>
#include <vnet/udp/udp.h>
#include <vnet/udp/udp_packet.h>
#include <vppinfra/sparse_vec.h>

typedef enum
{
  UDP_LOCAL_NEXT_PUNT,
  UDP_LOCAL_NEXT_DROP,
  UDP_LOCAL_NEXT_ICMP,
  UDP_LOCAL_N_NEXT
} udp_local_next_t;

typedef struct
{
  u16 src_port;
  u16 dst_port;
  u8 bound;
} udp_local_rx_trace_t;

#define UDP_NO_NODE_SET ((u16) ~0)

#ifndef CLIB_MARCH_VARIANT
u8 *
format_udp_rx_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 *);
  udp_local_rx_trace_t *t = va_arg (*args, udp_local_rx_trace_t *);

  s = format (s, "UDP: src-port %d dst-port %d%s",
	      clib_net_to_host_u16 (t->src_port),
	      clib_net_to_host_u16 (t->dst_port),
	      t->bound ? "" : " (no listener)");
  return s;
}
#endif /* CLIB_MARCH_VARIANT */

always_inline uword
udp46_local_inline (vlib_main_t * vm,
		    vlib_node_runtime_t * node,
		    vlib_frame_t * from_frame, int is_ip4)
{
  udp_main_t *um = &udp_main;
  __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
  u8 punt_unknown = is_ip4 ? um->punt_unknown4 : um->punt_unknown6;
  u16 *next_by_dst_port = (is_ip4 ?
			   um->next_by_dst_port4 : um->next_by_dst_port6);
  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;

  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, bi1;
	  vlib_buffer_t *b0, *b1;
	  udp_header_t *h0 = 0, *h1 = 0;
	  u32 i0, i1, dst_port0, dst_port1;
	  u32 advance0, advance1;
	  u32 error0, next0, error1, next1;

	  /* 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, sizeof (h0[0]), LOAD);
	    CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
	  }

	  bi0 = from[0];
	  bi1 = from[1];
	  to_next[0] = bi0;
	  to_next[1] = bi1;
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

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

	  /* ip4/6_local hands us the ip header, not the udp header */
	  if (is_ip4)
	    {
	      advance0 = ip4_header_bytes (vlib_buffer_get_current (b0));
	      advance1 = ip4_header_bytes (vlib_buffer_get_current (b1));
	    }
	  else
	    {
	      advance0 = sizeof (ip6_header_t);
	      advance1 = sizeof (ip6_header_t);
	    }

	  if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0)))
	    {
	      error0 = UDP_ERROR_LENGTH_ERROR;
	      next0 = UDP_LOCAL_NEXT_DROP;
	    }
	  else
	    {
	      vlib_buffer_advance (b0, advance0);
	      h0 = vlib_buffer_get_current (b0);
	      error0 = UDP_ERROR_NONE;
	      next0 = UDP_LOCAL_NEXT_PUNT;
	      if (PREDICT_FALSE (clib_net_to_host_u16 (h0->length) >
				 vlib_buffer_length_in_chain (vm, b0)))
		{
		  error0 = UDP_ERROR_LENGTH_ERROR;
		  next0 = UDP_LOCAL_NEXT_DROP;
		}
	    }

	  if (PREDICT_FALSE (b1->current_length < advance1 + sizeof (*h1)))
	    {
	      error1 = UDP_ERROR_LENGTH_ERROR;
	      next1 = UDP_LOCAL_NEXT_DROP;
	    }
	  else
	    {
	      vlib_buffer_advance (b1, advance1);
	      h1 = vlib_buffer_get_current (b1);
	      error1 = UDP_ERROR_NONE;
	      next1 = UDP_LOCAL_NEXT_PUNT;
	      if (PREDICT_FALSE (clib_net_to_host_u16 (h1->length) >
				 vlib_buffer_length_in_chain (vm, b1)))
		{
		  error1 = UDP_ERROR_LENGTH_ERROR;
		  next1 = UDP_LOCAL_NEXT_DROP;
		}
	    }

	  /* Index sparse array with network byte order. */
	  dst_port0 = (error0 == 0) ? h0->dst_port : 0;
	  dst_port1 = (error1 == 0) ? h1->dst_port : 0;
	  sparse_vec_index2 (next_by_dst_port, dst_port0, dst_port1, &i0,
			     &i1);
	  next0 = (error0 == 0) ? vec_elt (next_by_dst_port, i0) : next0;
	  next1 = (error1 == 0) ? vec_elt (next_by_dst_port, i1) : next1;

	  if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX ||
			     next0 == UDP_NO_NODE_SET))
	    {
	      // move the pointer back so icmp-error can find the
	      // ip packet header
	      vlib_buffer_advance (b0, -(word) advance0);

	      if (PREDICT_FALSE (punt_unknown))
		{
		  b0->error = node->errors[UDP_ERROR_PUNT];
		  next0 = UDP_LOCAL_NEXT_PUNT;
		}
	      else if (is_ip4)
		{
		  icmp4_error_set_vnet_buffer (b0,
					       ICMP4_destination_unreachable,
					       ICMP4_destination_unreachable_port_unreachable,
					       0);
		  b0->error = node->errors[UDP_ERROR_NO_LISTENER];
		  next0 = UDP_LOCAL_NEXT_ICMP;
		}
	      else
		{
		  icmp6_error_set_vnet_buffer (b0,
					       ICMP6_destination_unreachable,
					       ICMP6_destination_unreachable_port_unreachable,
					       0);
		  b0->error = node->errors[UDP_ERROR_NO_LISTENER];
		  next0 = UDP_LOCAL_NEXT_ICMP;
		}
	    }
	  else
	    {
	      b0->error = node<style>
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</style><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm"> * mpls_error.def: mpls errors</span>
<span class="cm"> *</span>
<span class="cm"> * Copyright (c) 2012 Cisco and/or its affiliates.</span>
<span class="cm"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="cm"> * you may not use this file except in compliance with the License.</span>
<span class="cm"> * You may obtain a copy of the License at:</span>
<span class="cm"> *</span>
<span class="cm"> *     http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="cm"> *</span>
<span class="cm"> * Unless required by applicable law or agreed to in writing, software</span>
<span class="cm"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="cm"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="cm"> * See the License for the specific language governing permissions and</span>
<span class="cm"> * limitations under the License.</span>
<span class="cm"> */</span>

<span class="n">mpls_error</span> <span class="p">(</span><span class="kr">NONE</span><span class="p">,</span> <span class="s">&quot;no error&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">UNKNOWN_PROTOCOL</span><span class="p">,</span> <span class="s">&quot;unknown protocol&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">UNSUPPORTED_VERSION</span><span class="p">,</span> <span class="s">&quot;unsupported version&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">PKTS_DECAP</span><span class="p">,</span> <span class="s">&quot;MPLS input packets decapsulated&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">PKTS_ENCAP</span><span class="p">,</span> <span class="s">&quot;MPLS output packets encapsulated&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">PKTS_NEED_FRAG</span><span class="p">,</span> <span class="s">&quot;MPLS output packets needs fragmentation&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">NO_LABEL</span><span class="p">,</span> <span class="s">&quot;MPLS no label for fib/dst&quot;</span><span class="p">)</span>
<span class="n">mpls_error</span> <span class="p">(</span><span class="n">TTL_EXPIRED</span><span class="p">,</span> <span class="s">&quot;MPLS ttl expired&quot;</span><span class="p">)</s