| 1 | /*
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| 2 | * Copyright (c) 2009 Lukas Mejdrech
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libnet
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /** @file
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| 34 | * ICMP header definition.
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| 35 | * Based on the RFC 792.
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| 36 | */
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| 37 |
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| 38 | #ifndef LIBNET_ICMP_HEADER_H_
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| 39 | #define LIBNET_ICMP_HEADER_H_
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| 40 |
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| 41 | #include <sys/types.h>
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| 42 |
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| 43 | #include <net/in.h>
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| 44 | #include <net/icmp_codes.h>
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| 45 |
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| 46 | /** ICMP header size in bytes. */
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| 47 | #define ICMP_HEADER_SIZE sizeof(icmp_header_t)
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| 48 |
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| 49 | /** Type definition of the echo specific data.
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| 50 | * @see icmp_echo
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| 51 | */
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| 52 | typedef struct icmp_echo icmp_echo_t;
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| 53 |
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| 54 | /** Type definition of the echo specific data pointer.
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| 55 | * @see icmp_echo
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| 56 | */
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| 57 | typedef icmp_echo_t *icmp_echo_ref;
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| 58 |
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| 59 | /** Echo specific data. */
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| 60 | struct icmp_echo {
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| 61 | /** Message idintifier. */
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| 62 | icmp_param_t identifier;
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| 63 | /** Message sequence number. */
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| 64 | icmp_param_t sequence_number;
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| 65 | } __attribute__ ((packed));
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| 66 |
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| 67 | /** Type definition of the internet control message header.
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| 68 | * @see icmp_header
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| 69 | */
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| 70 | typedef struct icmp_header icmp_header_t;
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| 71 |
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| 72 | /** Type definition of the internet control message header pointer.
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| 73 | * @see icmp_header
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| 74 | */
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| 75 | typedef icmp_header_t *icmp_header_ref;
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| 76 |
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| 77 | /** Internet control message header. */
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| 78 | struct icmp_header {
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| 79 | /** The type of the message. */
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| 80 | uint8_t type;
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| 81 |
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| 82 | /**
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| 83 | * The error code for the datagram reported by the ICMP message.
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| 84 | * The interpretation is dependent on the message type.
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| 85 | */
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| 86 | uint8_t code;
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| 87 |
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| 88 | /**
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| 89 | * The checksum is the 16-bit ones's complement of the one's complement
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| 90 | * sum of the ICMP message starting with the ICMP Type. For computing
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| 91 | * the checksum, the checksum field should be zero. If the checksum does
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| 92 | * not match the contents, the datagram is discarded.
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| 93 | */
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| 94 | uint16_t checksum;
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| 95 |
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| 96 | /** Message specific data. */
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| 97 | union {
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| 98 | /** Echo specific data. */
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| 99 | icmp_echo_t echo;
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| 100 | /** Proposed gateway value. */
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| 101 | in_addr_t gateway;
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| 102 |
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| 103 | /** Fragmentation needed specific data. */
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| 104 | struct {
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| 105 | /** Reserved field. Must be zero. */
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| 106 | icmp_param_t reserved;
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| 107 | /** Proposed MTU. */
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| 108 | icmp_param_t mtu;
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| 109 | } frag;
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| 110 |
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| 111 | /** Parameter problem specific data. */
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| 112 | struct {
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| 113 | /** Problem pointer. */
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| 114 | icmp_param_t pointer;
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| 115 | /** Reserved field. Must be zero. */
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| 116 | icmp_param_t reserved;
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| 117 | } param;
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| 118 | } un;
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| 119 | } __attribute__ ((packed));
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| 120 |
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| 121 | #endif
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| 122 |
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| 123 | /** @}
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| 124 | */
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