
/*
 * 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 <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/vxlan/vxlan.h>
#include <vnet/qos/qos_types.h>
#include <vnet/adj/rewrite.h>

/* Statistics (not all errors) */
#define foreach_vxlan_encap_error    \
_(ENCAPSULATED, "good packets encapsulated")

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

typedef enum {
#define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
    foreach_vxlan_encap_error
#undef _
    VXLAN_ENCAP_N_ERROR,
} vxlan_encap_error_t;

typedef enum {
    VXLAN_ENCAP_NEXT_DROP,
    VXLAN_ENCAP_N_NEXT,
} vxlan_encap_next_t;

typedef struct {
  u32 tunnel_index;
  u32 vni;
} vxlan_encap_trace_t;

u8 * format_vxlan_encap_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 *);
  vxlan_encap_trace_t * t 
      = va_arg (*args, vxlan_encap_trace_t *);

  s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d", 
	      t->tunnel_index, t->vni);
  return s;
}

always_inline uword
vxlan_encap_inline (vlib_main_t * vm,
		    vlib_node_runtime_t * node,
		    vlib_frame_t * from_frame,
		    u8 is_ip4, u8 csum_offload)
{
  u32 n_left_from, next_index, * from, * to_next;
  vxlan_main_t * vxm = &vxlan_main;
  vnet_main_t * vnm = vxm->vnet_main;
  vnet_interface_main_t * im = &vnm->interface_main;
  vlib_combined_counter_main_t * tx_counter = 
      im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
  u32 pkts_encapsulated = 0;
  u32 thread_index = vlib_get_thread_index();
  u32 sw_if_index0 = 0, sw_if_index1 = 0;
  u32 next0 = 0, next1 = 0;
  vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
  index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;

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

  next_index = node->cached_next_index;

  STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
  STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);

  u8 const underlay_hdr_len = is_ip4 ?
    sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
  u8 const rw_hdr_offset = sizeof t0->rewrite_data - underlay_hdr_len;
  u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
  u32 const csum_flags = is_ip4 ?
    VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
    VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
    VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;

  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)
	{
	  /* 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, LOAD);
	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
	  }

	  u32 bi0 = to_next[0] = from[0];
	  u32 bi1 = to_next[1] = from[1];
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

	  vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
	  vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
          u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
          u32 flow_hash1 = vnet_l2_compute_flow_hash (b1);

	  /* Get next node index and adj index from tunnel next_dpo */
	  if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
	    {
	      sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
	      vnet_hw_interface_t *hi0 = 
		  vnet_get_sup_hw_interface (vnm, sw_if_index0);
	      t0 = &vxm->tunnels[hi0->dev_instance];
	      /* Note: change to always set next0 if it may set to drop */
	      next0 = t0->next_dpo.dpoi_next_node;
	      dpoi_idx0 = t0->next_dpo.dpoi_index;
	    }

	  /* Get next node index and adj index from tunnel next_dpo */
	  if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX])
	    {
	      if (sw_if_index0 == vnet_buffer(b1)->sw_if_index[VLIB_TX])
	        {
		  sw_if_index1 = sw_if_index0;
		  t1 = t0;
		  next1 = next0;
		  dpoi_idx1 = dpoi_idx0;
	        }
	      else
	        {
		  sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
		  vnet_hw_interface_t *hi1 = 
		      vnet_get_sup_hw_interface (vnm, sw_if_index1);
		  t1 = &vxm->tunnels[hi1->dev_instance];
		  /* Note: change to always set next1 if it may set to drop */
		  next1 = t1->next_dpo.dpoi_next_node;
		  dpoi_idx1 = t1->next_dpo.dpoi_index;
	        }
	    }

          vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dp<style>
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</style><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm"> * Copyright (c) 2015 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">vxlan_error</span> <span class="p">(</span><span class="n">DECAPSULATED</span><span class="p">,</span> <span class="s">&quot;good packets decapsulated&quot;</span><span class="p">)</span>
<span class="n">vxlan_error</span> <span class="p">(</span><span class="n">NO_SUCH_TUNNEL</span><span class="p">,</span> <span class="s">&quot;no such tunnel packets&quot;</span><span class="p">)</span>
<span class="n">vxlan_error</span> <span class="p">(</span><span class="n">BAD_FLAGS</span><span class="p">,</span> <span class="s">&quot;packets with bad flags field in vxlan header&quot;</span><span class="p">)</span>
</pre></div>
</code></pre></td></tr></table>
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rs = ARRAY_LEN(vxlan_encap_error_strings),
  .error_strings = vxlan_encap_error_strings,
  .n_next_nodes = VXLAN_ENCAP_N_NEXT,
  .next_nodes = {
        [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
  },
};

VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)

