mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/IPv4Address.h>
|
|
#include <AK/NetworkOrdered.h>
|
|
#include <AK/String.h>
|
|
#include <AK/Types.h>
|
|
|
|
namespace Kernel {
|
|
|
|
enum class IPv4Protocol : u16 {
|
|
ICMP = 1,
|
|
TCP = 6,
|
|
UDP = 17,
|
|
};
|
|
|
|
NetworkOrdered<u16> internet_checksum(const void*, size_t);
|
|
|
|
class [[gnu::packed]] IPv4Packet
|
|
{
|
|
public:
|
|
u8 version() const { return (m_version_and_ihl >> 4) & 0xf; }
|
|
void set_version(u8 version) { m_version_and_ihl = (m_version_and_ihl & 0x0f) | (version << 4); }
|
|
|
|
u8 internet_header_length() const { return m_version_and_ihl & 0xf; }
|
|
void set_internet_header_length(u8 ihl) { m_version_and_ihl = (m_version_and_ihl & 0xf0) | (ihl & 0x0f); }
|
|
|
|
u16 length() const { return m_length; }
|
|
void set_length(u16 length) { m_length = length; }
|
|
|
|
u16 ident() const { return m_ident; }
|
|
void set_ident(u16 ident) { m_ident = ident; }
|
|
|
|
u8 ttl() const { return m_ttl; }
|
|
void set_ttl(u8 ttl) { m_ttl = ttl; }
|
|
|
|
u8 protocol() const { return m_protocol; }
|
|
void set_protocol(u8 protocol) { m_protocol = protocol; }
|
|
|
|
u16 checksum() const { return m_checksum; }
|
|
void set_checksum(u16 checksum) { m_checksum = checksum; }
|
|
|
|
const IPv4Address& source() const { return m_source; }
|
|
void set_source(const IPv4Address& address) { m_source = address; }
|
|
|
|
const IPv4Address& destination() const { return m_destination; }
|
|
void set_destination(const IPv4Address& address) { m_destination = address; }
|
|
|
|
void* payload() { return this + 1; }
|
|
const void* payload() const { return this + 1; }
|
|
|
|
u16 payload_size() const { return m_length - sizeof(IPv4Packet); }
|
|
|
|
NetworkOrdered<u16> compute_checksum() const
|
|
{
|
|
ASSERT(!m_checksum);
|
|
return internet_checksum(this, sizeof(IPv4Packet));
|
|
}
|
|
|
|
private:
|
|
u8 m_version_and_ihl { 0 };
|
|
u8 m_dscp_and_ecn { 0 };
|
|
NetworkOrdered<u16> m_length;
|
|
NetworkOrdered<u16> m_ident;
|
|
NetworkOrdered<u16> m_flags_and_fragment;
|
|
u8 m_ttl { 0 };
|
|
NetworkOrdered<u8> m_protocol;
|
|
NetworkOrdered<u16> m_checksum;
|
|
IPv4Address m_source;
|
|
IPv4Address m_destination;
|
|
};
|
|
|
|
static_assert(sizeof(IPv4Packet) == 20);
|
|
|
|
inline NetworkOrdered<u16> internet_checksum(const void* ptr, size_t count)
|
|
{
|
|
u32 checksum = 0;
|
|
auto* w = (const u16*)ptr;
|
|
while (count > 1) {
|
|
checksum += convert_between_host_and_network(*w++);
|
|
if (checksum & 0x80000000)
|
|
checksum = (checksum & 0xffff) | (checksum >> 16);
|
|
count -= 2;
|
|
}
|
|
while (checksum >> 16)
|
|
checksum = (checksum & 0xffff) + (checksum >> 16);
|
|
return ~checksum & 0xffff;
|
|
}
|
|
|
|
}
|