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Kernel: Fix TCP window scaling

This commit is contained in:
Bananymous 2025-04-05 18:40:23 +03:00
parent a0123e7c2d
commit c9132d984b
2 changed files with 20 additions and 11 deletions
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7
kernel/include/kernel/Networking/TCPSocket.h
View File

@ -91,7 +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
uint8_t scale_shift { 0 }; // window scale
BAN::UniqPtr<VirtualRange> buffer;
};
@ -99,8 +99,8 @@ namespace Kernel
{
uint32_t mss { 0 }; // maximum segment size
uint16_t non_scaled_size { 0 }; // window size without scaling
uint8_t scale { 0 }; // window scale
uint32_t scaled_size() const { return (uint32_t)non_scaled_size << scale; }
uint8_t scale_shift { 0 }; // window scale
uint32_t scaled_size() const { return (uint32_t)non_scaled_size << scale_shift; }
uint32_t start_seq { 0 }; // sequence number of first byte in buffer
uint32_t current_seq { 0 }; // sequence number of next send
@ -118,6 +118,7 @@ namespace Kernel
{
sockaddr_storage address;
socklen_t address_len;
bool has_window_scale;
};
struct PendingConnection

24
kernel/kernel/Networking/TCPSocket.cpp
View File

@ -32,7 +32,7 @@ namespace Kernel
PageTable::Flags::ReadWrite | PageTable::Flags::Present,
true
));
socket->m_recv_window.scale = 12; // use PAGE_SIZE windows
socket->m_recv_window.scale_shift = PAGE_SIZE_SHIFT; // use PAGE_SIZE windows
socket->m_send_window.buffer = TRY(VirtualRange::create_to_vaddr_range(
PageTable::kernel(),
KERNEL_OFFSET,
@ -80,7 +80,6 @@ namespace Kernel
auto connection = m_pending_connections.front();
m_pending_connections.pop();
auto listen_key = ListenKey(
reinterpret_cast<const sockaddr*>(&connection.target.address),
connection.target.address_len
@ -104,6 +103,9 @@ namespace Kernel
return_inode->m_next_state = State::SynReceived;
return_inode->m_mutex.unlock();
if (!return_inode->m_connection_info->has_window_scale)
return_inode->m_recv_window.scale_shift = 0;
TRY(m_listen_children.emplace(listen_key, return_inode));
const uint64_t wake_time_ms = SystemTimer::get().ms_since_boot() + 5000;
@ -155,7 +157,7 @@ namespace Kernel
if (!is_bound())
TRY(m_network_layer.bind_socket_to_unused(this, address, address_len));
m_connection_info.emplace(sockaddr_storage {}, address_len);
m_connection_info.emplace(sockaddr_storage {}, address_len, true);
memcpy(&m_connection_info->address, address, address_len);
m_next_flags = SYN;
@ -377,16 +379,18 @@ 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 = BAN::Math::min<size_t>(0xFFFF, m_recv_window.buffer->size() >> m_recv_window.scale);
header.window_size = BAN::Math::min<size_t>(0xFFFF, m_recv_window.buffer->size() >> m_recv_window.scale_shift);
header.flags = m_next_flags;
if (header.flags & FIN)
m_send_window.has_ghost_byte = true;
m_next_flags = 0;
if (m_state == State::Closed)
if (m_state == State::Closed || m_state == State::SynReceived)
{
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, m_recv_window.scale);
if (m_connection_info->has_window_scale)
add_tcp_header_option<4, TCPOption::WindowScale>(header, m_recv_window.scale_shift);
header.window_size = BAN::Math::min<size_t>(0xFFFF, m_recv_window.buffer->size());
m_send_window.mss = 1440;
@ -463,9 +467,12 @@ namespace Kernel
if (options.maximum_seqment_size.has_value())
m_send_window.mss = *options.maximum_seqment_size;
if (options.window_scale.has_value())
m_send_window.scale = *options.window_scale;
m_send_window.scale_shift = *options.window_scale;
else
m_recv_window.scale = 1;
{
m_recv_window.scale_shift = 0;
m_connection_info->has_window_scale = false;
}
m_send_window.start_seq = m_send_window.current_seq;
m_send_window.current_ack = m_send_window.current_seq;
@ -492,6 +499,7 @@ namespace Kernel
ConnectionInfo connection_info;
memcpy(&connection_info.address, sender, sender_len);
connection_info.address_len = sender_len;
connection_info.has_window_scale = parse_tcp_options(header).window_scale.has_value();
MUST(m_pending_connections.emplace(
connection_info,
header.seq_number + 1