icmp.h

/*
 * Copyright (c) 2017-2019 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.
 */
 
#ifndef HICN_PROTOCOL_ICMP_H
#define HICN_PROTOCOL_ICMP_H
 
#include "../common.h"
 
/*
 * The length of the ICMP header struct must be 4 bytes.
 */
#define EXPECTED_ICMP_HDRLEN 4
 
typedef struct
{
  u8 type;
  u8 code;
  u16 csum;
} _icmp_header_t;
 
#define ICMP_HDRLEN sizeof(_icmp_header_t)
static_assert (EXPECTED_ICMP_HDRLEN == ICMP_HDRLEN,
           "Size of ICMP struct does not match its expected size.");
 
/*
 * The length of the ICMPWLDR header struct must be 4 bytes.
 */
#define EXPECTED_ICMPWLDR_HDRLEN 8
 
typedef struct
{
  u8 type;
  u8 code;
  u16 csum;
  union
  {
    struct
    {
      u16 id;
      u16 sequence;
    } echo;         /* echo datagram */
    u32 gateway;        /* gateway address */
    struct
    {
      u16 _unused;
      u16 mtu;
    } frag;         /* path mtu discovery */
    struct
    {
      u16 expected_lbl;
      u16 received_lbl;
    } wldr_notification_lbl;
  };
} _icmp_wldr_header_t;
 
#define ICMPWLDR_HDRLEN sizeof(_icmp_wldr_header_t)
static_assert (EXPECTED_ICMPWLDR_HDRLEN == ICMPWLDR_HDRLEN,
           "Size of ICMPWLDR struct does not match its expected size.");
 
#endif /* HICN_PROTOCOL_ICMP_H */
 
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */