/*
 * 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.
 */
#ifndef __included_ip6_hop_by_hop_packet_h__
#define __included_ip6_hop_by_hop_packet_h__

typedef struct {
  /* Protocol for next header */
  u8 protocol;
  /*
   * Length of hop_by_hop header in 8 octet units, 
   * not including the first 8 octets
   */
  u8 length;
} ip6_hop_by_hop_header_t;

typedef struct {
  /* Option Type */
#define HBH_OPTION_TYPE_SKIP_UNKNOWN (0x00)
#define HBH_OPTION_TYPE_DISCARD_UNKNOWN (0x40)
#define HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP (0x80)
#define HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST (0xc0)
#define HBH_OPTION_TYPE_HIGH_ORDER_BITS (0xc0)
#define HBH_OPTION_TYPE_DATA_CHANGE_ENROUTE (1<<5)
  u8 type;
  /* Length in octets of the option data field */
  u8 length;
} ip6_hop_by_hop_option_t;

/* $$$$ IANA banana constants */
#define HBH_OPTION_TYPE_IOAM_TRACE_DATA_LIST 59 /* Third highest bit set (change en-route) */
#define HBH_OPTION_TYPE_IOAM_PROOF_OF_TRANSIT 60   /* Third highest bit set (change en-route) */
#define HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE 29


typedef CLIB_PACKED(struct {
  ip6_hop_by_hop_option_t hdr;
  u8 e2e_type;
  u8 reserved;
  u32 e2e_data;
}) ioam_e2e_option_t;

#endif /* __included_ip6_hop_by_hop_packet_h__ */
