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Kernel: Cleanup TCP and add basic window scaling support

This commit is contained in:
Bananymous 2025-04-01 23:04:59 +03:00
parent 96767f5ca8
commit 36026d4ec6
2 changed files with 17 additions and 13 deletions
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3
kernel/include/kernel/Networking/TCPSocket.h
View File

@ -43,7 +43,7 @@ namespace Kernel
class TCPSocket final : public NetworkSocket
{
public:
static constexpr size_t m_tcp_options_bytes = 4;
static constexpr size_t m_tcp_options_bytes = 8;
public:
static BAN::ErrorOr<BAN::RefPtr<TCPSocket>> create(NetworkLayer&, const Info&);
@ -91,6 +91,7 @@ namespace Kernel
bool has_ghost_byte { false };
uint32_t data_size { 0 }; // number of bytes in this buffer
uint8_t scale { 1 }; // window scale
BAN::UniqPtr<VirtualRange> buffer;
};

27
kernel/kernel/Networking/TCPSocket.cpp
View File

@ -18,8 +18,8 @@ namespace Kernel
WindowScale = 0x03,
};
static constexpr size_t s_window_buffer_size = 15 * PAGE_SIZE;
static_assert(s_window_buffer_size <= UINT16_MAX);
static constexpr size_t s_recv_window_buffer_size = 16 * PAGE_SIZE;
static constexpr size_t s_send_window_buffer_size = 16 * PAGE_SIZE;
BAN::ErrorOr<BAN::RefPtr<TCPSocket>> TCPSocket::create(NetworkLayer& network_layer, const Info& info)
{
@ -28,15 +28,16 @@ namespace Kernel
PageTable::kernel(),
KERNEL_OFFSET,
~(vaddr_t)0,
s_window_buffer_size,
s_recv_window_buffer_size,
PageTable::Flags::ReadWrite | PageTable::Flags::Present,
true
));
socket->m_recv_window.scale = 12; // use PAGE_SIZE windows
socket->m_send_window.buffer = TRY(VirtualRange::create_to_vaddr_range(
PageTable::kernel(),
KERNEL_OFFSET,
~(vaddr_t)0,
s_window_buffer_size,
s_send_window_buffer_size,
PageTable::Flags::ReadWrite | PageTable::Flags::Present,
true
));
@ -73,7 +74,7 @@ namespace Kernel
while (m_pending_connections.empty())
{
LockFreeGuard _(m_mutex);
TRY(Thread::current().block_or_eintr_indefinite(m_thread_blocker));
TRY(Thread::current().block_or_eintr_or_timeout_ms(m_thread_blocker, 100, false));
}
auto connection = m_pending_connections.front();
@ -205,7 +206,7 @@ namespace Kernel
if (m_state != State::Established)
return return_with_maybe_zero();
LockFreeGuard free(m_mutex);
TRY(Thread::current().block_or_eintr_indefinite(m_thread_blocker));
TRY(Thread::current().block_or_eintr_or_timeout_ms(m_thread_blocker, 100, false));
}
const uint32_t to_recv = BAN::Math::min<uint32_t>(buffer.size(), m_recv_window.data_size);
@ -247,7 +248,7 @@ namespace Kernel
if (m_send_window.data_size + message.size() <= m_send_window.buffer->size())
break;
LockFreeGuard free(m_mutex);
TRY(Thread::current().block_or_eintr_indefinite(m_thread_blocker));
TRY(Thread::current().block_or_eintr_or_timeout_ms(m_thread_blocker, 100, false));
}
{
@ -264,7 +265,7 @@ namespace Kernel
if (m_state != State::Established)
return return_with_maybe_zero();
LockFreeGuard free(m_mutex);
TRY(Thread::current().block_or_eintr_indefinite(m_thread_blocker));
TRY(Thread::current().block_or_eintr_or_timeout_ms(m_thread_blocker, 100, false));
}
return message.size();
@ -376,18 +377,18 @@ namespace Kernel
header.seq_number = m_send_window.current_seq + m_send_window.has_ghost_byte;
header.ack_number = m_recv_window.start_seq + m_recv_window.data_size + m_recv_window.has_ghost_byte;
header.data_offset = (sizeof(TCPHeader) + m_tcp_options_bytes) / sizeof(uint32_t);
header.window_size = m_recv_window.buffer->size();
header.window_size = BAN::Math::min<size_t>(0xFFFF, m_recv_window.buffer->size() >> m_recv_window.scale);
header.flags = m_next_flags;
if (header.flags & FIN)
m_send_window.has_ghost_byte = true;
m_next_flags = 0;
ASSERT(m_recv_window.buffer->size() < (1 << (8 * sizeof(header.window_size))));
if (m_state == State::Closed)
{
add_tcp_header_option<0, TCPOption::MaximumSeqmentSize>(header, m_interface->payload_mtu() - m_network_layer.header_size());
add_tcp_header_option<4, TCPOption::WindowScale>(header, 0);
add_tcp_header_option<4, TCPOption::WindowScale>(header, m_recv_window.scale);
header.window_size = BAN::Math::min<size_t>(0xFFFF, m_recv_window.buffer->size());
m_send_window.mss = 1440;
m_send_window.start_seq++;
m_send_window.current_seq = m_send_window.start_seq;
@ -463,6 +464,8 @@ namespace Kernel
m_send_window.mss = *options.maximum_seqment_size;
if (options.window_scale.has_value())
m_send_window.scale = *options.window_scale;
else
m_recv_window.scale = 1;
m_send_window.start_seq = m_send_window.current_seq;
m_send_window.current_ack = m_send_window.current_seq;