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/*
 * Copyright (c) 2021-2022 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.
 */

#ifndef HICN_PROTOCOL_IPV6_H
#define HICN_PROTOCOL_IPV6_H

#include <hicn/util/ip_address.h>

#include <hicn/common.h>

/*
 * The length of the IPV6 header struct must be 40 bytes.
 */
#define EXPECTED_IPV6_HDRLEN 40

typedef struct
{
#if 0 // TEMPORARY FIX
  union
  {
    struct
    {
#endif
  u32 version_class_flow; /* version, traffic class and 20 bits of flow-ID */
  u16 len;		  /* payload length */
  u8 nxt;		  /* next header */
  u8 hlim;		  /* hop limit */
#if 0
    };
    u8 vfc;			/* 4 bits version, top 4 bits class */
  };
#endif
  ipv6_address_t saddr; /* source address */
  ipv6_address_t daddr; /* destination address */
} _ipv6_header_t;

#define IPV6_HDRLEN sizeof (_ipv6_header_t)
static_assert (EXPECTED_IPV6_HDRLEN == IPV6_HDRLEN,
	       "Size of IPV6 struct does not match its expected size.");

/*
 * The length of the IPV6 pseudo header struct must be 40 bytes.
 */
#define EXPECTED_IPV6_PSHDRLEN 40

typedef struct
{
  ipv6_address_t ip_src;
  ipv6_address_t ip_dst;
  u32 size;
  u16 zeros;
  u8 zero;
  u8 protocol;
} ipv6_pseudo_header_t;

#define IPV6_PSHDRLEN sizeof (ipv6_pseudo_header_t)
static_assert (EXPECTED_IPV6_PSHDRLEN == IPV6_PSHDRLEN,
	       "Size of IPV6_PSHDR struct does not match its expected size.");

/* Default field values */
#define IPV6_DEFAULT_VERSION	    6
#define IPV6_DEFAULT_TRAFFIC_CLASS  0
#define IPV6_DEFAULT_FLOW_LABEL	    0
#define IPV6_DEFAULT_PAYLOAD_LENGTH 0

#endif

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