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IPv4: More hacking on bringing up TCP support.

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This was a bit more complicated than I expected, but it's moving forward.
This commit is contained in:
Andreas Kling 2019-03-13 23:14:30 +01:00
parent 7aba68d51c
commit 032d9d7065
7 changed files with 193 additions and 33 deletions
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25
Kernel/TCP.h
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@ -2,6 +2,17 @@
#include <Kernel/IPv4.h>
struct TCPFlags {
enum : word {
FIN = 0x01,
SYN = 0x02,
RST = 0x04,
PUSH = 0x08,
ACK = 0x10,
URG = 0x20
};
};
class [[gnu::packed]] TCPPacket {
public:
TCPPacket() { }
@ -19,8 +30,14 @@ public:
dword ack_number() const { return m_ack_number; }
void set_ack_number(dword number) { m_ack_number = number; }
word flags() const { return m_flags; }
void set_flags(word flags) { m_flags = flags; }
word flags() const { return m_flags_and_data_offset & 0x1ff; }
void set_flags(word 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; }
byte data_offset() const { return (m_flags_and_data_offset & 0xf000) >> 12; }
void set_data_offset(word data_offset) { m_flags_and_data_offset = (m_flags_and_data_offset & ~0xf000) | data_offset << 12; }
word window_size() const { return m_window_size; }
void set_window_size(word window_size) { m_window_size = window_size; }
@ -40,10 +57,10 @@ private:
NetworkOrdered<dword> m_sequence_number;
NetworkOrdered<dword> m_ack_number;
NetworkOrdered<word> m_flags;
NetworkOrdered<word> m_flags_and_data_offset;
NetworkOrdered<word> m_window_size;
NetworkOrdered<word> m_checksum;
NetworkOrdered<word> m_urgent;
};
static_assert(sizeof(UDPPacket) == 8);
static_assert(sizeof(TCPPacket) == 20);