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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/MACAddress.h>
30#include <Kernel/Net/IPv4.h>
31
32struct ICMPType {
33 enum {
34 EchoReply = 0,
35 EchoRequest = 8,
36 };
37};
38
39class [[gnu::packed]] ICMPHeader
40{
41public:
42 ICMPHeader() {}
43 ~ICMPHeader() {}
44
45 u8 type() const { return m_type; }
46 void set_type(u8 b) { m_type = b; }
47
48 u8 code() const { return m_code; }
49 void set_code(u8 b) { m_code = b; }
50
51 u16 checksum() const { return m_checksum; }
52 void set_checksum(u16 w) { m_checksum = w; }
53
54 const void* payload() const { return this + 1; }
55 void* payload() { return this + 1; }
56
57private:
58 u8 m_type { 0 };
59 u8 m_code { 0 };
60 NetworkOrdered<u16> m_checksum { 0 };
61 // NOTE: The rest of the header is 4 bytes
62};
63
64static_assert(sizeof(ICMPHeader) == 4);
65
66struct [[gnu::packed]] ICMPEchoPacket
67{
68 ICMPHeader header;
69 NetworkOrdered<u16> identifier;
70 NetworkOrdered<u16> sequence_number;
71 void* payload() { return this + 1; }
72 const void* payload() const { return this + 1; }
73};