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117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/Assertions.h>
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#include <AK/IPv4Address.h>
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#include <AK/NetworkOrdered.h>
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#include <AK/Types.h>
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namespace Kernel {
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enum class IPv4Protocol : u16 {
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ICMP = 1,
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TCP = 6,
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UDP = 17,
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};
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NetworkOrdered<u16> internet_checksum(const void*, size_t);
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class [[gnu::packed]] IPv4Packet
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{
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public:
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u8 version() const { return (m_version_and_ihl >> 4) & 0xf; }
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void set_version(u8 version) { m_version_and_ihl = (m_version_and_ihl & 0x0f) | (version << 4); }
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u8 internet_header_length() const { return m_version_and_ihl & 0xf; }
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void set_internet_header_length(u8 ihl) { m_version_and_ihl = (m_version_and_ihl & 0xf0) | (ihl & 0x0f); }
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u16 length() const { return m_length; }
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void set_length(u16 length) { m_length = length; }
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u16 ident() const { return m_ident; }
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void set_ident(u16 ident) { m_ident = ident; }
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u8 ttl() const { return m_ttl; }
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void set_ttl(u8 ttl) { m_ttl = ttl; }
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u8 protocol() const { return m_protocol; }
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void set_protocol(u8 protocol) { m_protocol = protocol; }
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u16 checksum() const { return m_checksum; }
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void set_checksum(u16 checksum) { m_checksum = checksum; }
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const IPv4Address& source() const { return m_source; }
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void set_source(const IPv4Address& address) { m_source = address; }
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const IPv4Address& destination() const { return m_destination; }
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void set_destination(const IPv4Address& address) { m_destination = address; }
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void* payload() { return this + 1; }
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const void* payload() const { return this + 1; }
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u16 payload_size() const { return m_length - sizeof(IPv4Packet); }
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NetworkOrdered<u16> compute_checksum() const
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{
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ASSERT(!m_checksum);
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return internet_checksum(this, sizeof(IPv4Packet));
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}
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private:
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u8 m_version_and_ihl { 0 };
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u8 m_dscp_and_ecn { 0 };
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NetworkOrdered<u16> m_length;
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NetworkOrdered<u16> m_ident;
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NetworkOrdered<u16> m_flags_and_fragment;
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u8 m_ttl { 0 };
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NetworkOrdered<u8> m_protocol;
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NetworkOrdered<u16> m_checksum;
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IPv4Address m_source;
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IPv4Address m_destination;
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};
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static_assert(sizeof(IPv4Packet) == 20);
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inline NetworkOrdered<u16> internet_checksum(const void* ptr, size_t count)
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{
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u32 checksum = 0;
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auto* w = (const u16*)ptr;
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while (count > 1) {
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checksum += convert_between_host_and_network(*w++);
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if (checksum & 0x80000000)
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checksum = (checksum & 0xffff) | (checksum >> 16);
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count -= 2;
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}
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while (checksum >> 16)
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checksum = (checksum & 0xffff) + (checksum >> 16);
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return ~checksum & 0xffff;
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}
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}
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