/*
 * Copyright (c) 2017 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.
 */
/*
 * ip/ip6_input.c: IP v6 input node
 *
 * 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_ip6_input_h
#define included_ip6_input_h

#include <vnet/ip/ip.h>
#include <vnet/ip/icmp6.h>

extern char *ip6_error_strings[];

typedef enum
{
  IP6_INPUT_NEXT_DROP,
  IP6_INPUT_NEXT_LOOKUP,
  IP6_INPUT_NEXT_LOOKUP_MULTICAST,
  IP6_INPUT_NEXT_ICMP_ERROR
/*
 * replication.c : packet replication
 *
 * 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 <vppinfra/error.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/replication.h>


replication_main_t replication_main;


replication_context_t *
replication_prep (vlib_main_t * vm,
		  vlib_buffer_t * b0, u32 recycle_node_index, u32 l2_packet)
{
  replication_main_t *rm = &replication_main;
  replication_context_t *ctx;
  uword thread_index = vm->thread_index;
  ip4_header_t *ip;
  u32 ctx_id;

  /* Allocate a context, reserve context 0 */
  if (PREDICT_FALSE (rm->contexts[thread_index] == 0))
    pool_get_aligned (rm->contexts[thread_index], ctx, CLIB_CACHE_LINE_BYTES);

  pool_get_aligned (rm->contexts[thread_index], ctx, CLIB_CACHE_LINE_BYTES);
  ctx_id = ctx - rm->contexts[thread_index];

  /* Save state from vlib buffer */
  ctx->saved_free_list_index = vlib_buffer_get_free_list_index (b0);
  ctx->current_data = b0->current_data;

  /* Set up vlib buffer hooks */
  b0->recycle_count = ctx_id;
  vlib_buffer_set_free_list_index (b0, rm->recycle_list_index);
  b0->flags |= VLIB_BUFFER_RECYCLE;

  /* Save feature state */
  ctx->recycle_node_index = recycle_node_index;

  /* Save vnet state */
  clib_memcpy (ctx->vnet_buffer, vnet_buffer (b0),
	       sizeof (vnet_buffer_opaque_t));

  /* Save packet contents */
  ctx->l2_packet = l2_packet;
  ip = (ip4_header_t *) vlib_buffer_get_current (b0);
  if (l2_packet)
    {
      /* Save ethernet header */
      ctx->l2_header[0] = ((u64 *) ip)[0];
      ctx->l2_header[1] = ((u64 *) ip)[1];
      ctx->l2_header[2] = ((u64 *) ip)[2];
      /* set ip to the true ip header */
      ip = (ip4_header_t *) (((u8 *) ip) + vnet_buffer (b0)->l2.l2_len);
    }

  /*
   * Copy L3 fields.
   * We need to save TOS for ip4 and ip6 packets.
   * Fortunately the TOS field is
   * in the first two bytes of both the ip4 and ip6 headers.
   */
  ctx->ip_tos = *((u16 *) (ip));

  /*
   * Save the ip4 checksum as well. We just blindly save the corresponding two
   * bytes even for ip6 packets.
   */
  ctx->ip4_checksum = ip->checksum;

  return ctx;
}


replication_context_t *
replication_recycle (vlib_main_t * vm, vlib_buffer_t * b0, u32 is_last)
{
  replication_main_t *rm = &replication_main;
  replication_context_t *ctx;
  uword thread_index = vm->thread_index;
  ip4_header_t *ip;

  /* Get access to the replication context */
  ctx = pool_elt_at_index (rm->contexts[thread_index], b0->recycle_count);