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73c998dbfc
This has several significant changes to the networking stack. * Significant refactoring of the TCP state machine. Right now it's probably more fragile than it used to be, but handles quite a lot more of the handshake process. * `TCPSocket` holds a `NetworkAdapter*`, assigned during `connect()` or `bind()`, whichever comes first. * `listen()` is now virtual in `Socket` and intended to be implemented in its child classes * `listen()` no longer works without `bind()` - this is a bit of a regression, but listening sockets didn't work at all before, so it's not possible to observe the regression. * A file is exposed at `/proc/net_tcp`, which is a JSON document listing the current TCP sockets with a bit of metadata. * There's an `ETHERNET_VERY_DEBUG` flag for dumping packet's content out to `kprintf`. It is, indeed, _very debug_.
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
#pragma once
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#include <Kernel/Net/IPv4.h>
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struct TCPFlags {
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enum : u16 {
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FIN = 0x01,
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SYN = 0x02,
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RST = 0x04,
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PUSH = 0x08,
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ACK = 0x10,
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URG = 0x20
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};
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};
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class [[gnu::packed]] TCPPacket
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{
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public:
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TCPPacket() {}
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~TCPPacket() {}
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size_t header_size() const { return data_offset() * sizeof(u32); }
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u16 source_port() const { return m_source_port; }
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void set_source_port(u16 port) { m_source_port = port; }
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u16 destination_port() const { return m_destination_port; }
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void set_destination_port(u16 port) { m_destination_port = port; }
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u32 sequence_number() const { return m_sequence_number; }
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void set_sequence_number(u32 number) { m_sequence_number = number; }
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u32 ack_number() const { return m_ack_number; }
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void set_ack_number(u32 number) { m_ack_number = number; }
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u16 flags() const { return m_flags_and_data_offset & 0x1ff; }
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void set_flags(u16 flags) { m_flags_and_data_offset = (m_flags_and_data_offset & ~0x1ff) | (flags & 0x1ff); }
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bool has_syn() const { return flags() & TCPFlags::SYN; }
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bool has_ack() const { return flags() & TCPFlags::ACK; }
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bool has_fin() const { return flags() & TCPFlags::FIN; }
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bool has_rst() const { return flags() & TCPFlags::RST; }
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u8 data_offset() const { return (m_flags_and_data_offset & 0xf000) >> 12; }
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void set_data_offset(u16 data_offset) { m_flags_and_data_offset = (m_flags_and_data_offset & ~0xf000) | data_offset << 12; }
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u16 window_size() const { return m_window_size; }
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void set_window_size(u16 window_size) { m_window_size = window_size; }
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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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u16 urgent() const { return m_urgent; }
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void set_urgent(u16 urgent) { m_urgent = urgent; }
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const void* payload() const { return ((const u8*)this) + header_size(); }
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void* payload() { return ((u8*)this) + header_size(); }
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private:
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NetworkOrdered<u16> m_source_port;
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NetworkOrdered<u16> m_destination_port;
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NetworkOrdered<u32> m_sequence_number;
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NetworkOrdered<u32> m_ack_number;
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NetworkOrdered<u16> m_flags_and_data_offset;
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NetworkOrdered<u16> m_window_size;
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NetworkOrdered<u16> m_checksum;
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NetworkOrdered<u16> m_urgent;
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};
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static_assert(sizeof(TCPPacket) == 20);
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