/* * Copyright (c) 2018-2020, Andreas Kling * 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 namespace Kernel { struct TCPFlags { enum : u16 { FIN = 0x01, SYN = 0x02, RST = 0x04, PUSH = 0x08, ACK = 0x10, URG = 0x20 }; }; class [[gnu::packed]] TCPPacket { public: TCPPacket() {} ~TCPPacket() {} size_t header_size() const { return data_offset() * sizeof(u32); } u16 source_port() const { return m_source_port; } void set_source_port(u16 port) { m_source_port = port; } u16 destination_port() const { return m_destination_port; } void set_destination_port(u16 port) { m_destination_port = port; } u32 sequence_number() const { return m_sequence_number; } void set_sequence_number(u32 number) { m_sequence_number = number; } u32 ack_number() const { return m_ack_number; } void set_ack_number(u32 number) { m_ack_number = number; } u16 flags() const { return m_flags_and_data_offset & 0x1ff; } void set_flags(u16 flags) { m_flags_and_data_offset = (m_flags_and_data_offset & ~0x1ff) | (flags & 0x1ff); } bool has_syn() const { return flags() & TCPFlags::SYN; } bool has_ack() const { return flags() & TCPFlags::ACK; } bool has_fin() const { return flags() & TCPFlags::FIN; } bool has_rst() const { return flags() & TCPFlags::RST; } u8 data_offset() const { return (m_flags_and_data_offset & 0xf000) >> 12; } void set_data_offset(u16 data_offset) { m_flags_and_data_offset = (m_flags_and_data_offset & ~0xf000) | data_offset << 12; } u16 window_size() const { return m_window_size; } void set_window_size(u16 window_size) { m_window_size = window_size; } u16 checksum() const { return m_checksum; } void set_checksum(u16 checksum) { m_checksum = checksum; } u16 urgent() const { return m_urgent; } void set_urgent(u16 urgent) { m_urgent = urgent; } const void* payload() const { return ((const u8*)this) + header_size(); } void* payload() { return ((u8*)this) + header_size(); } private: NetworkOrdered m_source_port; NetworkOrdered m_destination_port; NetworkOrdered m_sequence_number; NetworkOrdered m_ack_number; NetworkOrdered m_flags_and_data_offset; NetworkOrdered m_window_size; NetworkOrdered m_checksum; NetworkOrdered m_urgent; }; static_assert(sizeof(TCPPacket) == 20); }