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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/SinglyLinkedList.h>
#include <AK/WeakPtr.h>
#include <Kernel/KResult.h>
#include <Kernel/Net/IPv4Socket.h>
namespace Kernel {
class TCPSocket final : public IPv4Socket {
public:
static void for_each(Function<void(const TCPSocket&)>);
static KResultOr<NonnullRefPtr<TCPSocket>> create(int protocol);
virtual ~TCPSocket() override;
enum class Direction {
Unspecified,
Outgoing,
Incoming,
Passive,
};
static const char* to_string(Direction direction)
{
switch (direction) {
case Direction::Unspecified:
return "Unspecified";
case Direction::Outgoing:
return "Outgoing";
case Direction::Incoming:
return "Incoming";
case Direction::Passive:
return "Passive";
default:
return "None";
}
}
enum class State {
Closed,
Listen,
SynSent,
SynReceived,
Established,
CloseWait,
LastAck,
FinWait1,
FinWait2,
Closing,
TimeWait,
};
static const char* to_string(State state)
{
switch (state) {
case State::Closed:
return "Closed";
case State::Listen:
return "Listen";
case State::SynSent:
return "SynSent";
case State::SynReceived:
return "SynReceived";
case State::Established:
return "Established";
case State::CloseWait:
return "CloseWait";
case State::LastAck:
return "LastAck";
case State::FinWait1:
return "FinWait1";
case State::FinWait2:
return "FinWait2";
case State::Closing:
return "Closing";
case State::TimeWait:
return "TimeWait";
default:
return "None";
}
}
enum class Error {
None,
FINDuringConnect,
RSTDuringConnect,
UnexpectedFlagsDuringConnect,
};
static const char* to_string(Error error)
{
switch (error) {
case Error::None:
return "None";
case Error::FINDuringConnect:
return "FINDuringConnect";
case Error::RSTDuringConnect:
return "RSTDuringConnect";
case Error::UnexpectedFlagsDuringConnect:
return "UnexpectedFlagsDuringConnect";
default:
return "Invalid";
}
}
State state() const { return m_state; }
void set_state(State state);
Direction direction() const { return m_direction; }
bool has_error() const { return m_error != Error::None; }
Error error() const { return m_error; }
void set_error(Error error) { m_error = error; }
void set_ack_number(u32 n) { m_ack_number = n; }
void set_sequence_number(u32 n) { m_sequence_number = n; }
u32 ack_number() const { return m_ack_number; }
u32 sequence_number() const { return m_sequence_number; }
u32 packets_in() const { return m_packets_in; }
u32 bytes_in() const { return m_bytes_in; }
u32 packets_out() const { return m_packets_out; }
u32 bytes_out() const { return m_bytes_out; }
// FIXME: Make this configurable?
static constexpr u32 maximum_duplicate_acks = 5;
void set_duplicate_acks(u32 acks) { m_duplicate_acks = acks; }
u32 duplicate_acks() const { return m_duplicate_acks; }
KResult send_ack(bool allow_duplicate = false);
KResult send_tcp_packet(u16 flags, const UserOrKernelBuffer* = nullptr, size_t = 0);
void send_outgoing_packets(RoutingDecision&);
void receive_tcp_packet(const TCPPacket&, u16 size);
bool should_delay_next_ack() const;
static Lockable<HashMap<IPv4SocketTuple, TCPSocket*>>& sockets_by_tuple();
static RefPtr<TCPSocket> from_tuple(const IPv4SocketTuple& tuple);
static RefPtr<TCPSocket> from_endpoints(const IPv4Address& local_address, u16 local_port, const IPv4Address& peer_address, u16 peer_port);
static Lockable<HashMap<IPv4SocketTuple, RefPtr<TCPSocket>>>& closing_sockets();
RefPtr<TCPSocket> create_client(const IPv4Address& local_address, u16 local_port, const IPv4Address& peer_address, u16 peer_port);
void set_originator(TCPSocket& originator) { m_originator = originator; }
bool has_originator() { return !!m_originator; }
void release_to_originator();
void release_for_accept(RefPtr<TCPSocket>);
virtual KResult close() override;
protected:
void set_direction(Direction direction) { m_direction = direction; }
private:
explicit TCPSocket(int protocol);
virtual const char* class_name() const override { return "TCPSocket"; }
static NetworkOrdered<u16> compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket&, u16 payload_size);
virtual void shut_down_for_writing() override;
virtual KResultOr<size_t> protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, int flags) override;
virtual KResultOr<size_t> protocol_send(const UserOrKernelBuffer&, size_t) override;
virtual KResult protocol_connect(FileDescription&, ShouldBlock) override;
virtual KResultOr<u16> protocol_allocate_local_port() override;
virtual bool protocol_is_disconnected() const override;
virtual KResult protocol_bind() override;
virtual KResult protocol_listen() override;
WeakPtr<TCPSocket> m_originator;
HashMap<IPv4SocketTuple, NonnullRefPtr<TCPSocket>> m_pending_release_for_accept;
Direction m_direction { Direction::Unspecified };
Error m_error { Error::None };
RefPtr<NetworkAdapter> m_adapter;
u32 m_sequence_number { 0 };
u32 m_ack_number { 0 };
State m_state { State::Closed };
u32 m_packets_in { 0 };
u32 m_bytes_in { 0 };
u32 m_packets_out { 0 };
u32 m_bytes_out { 0 };
struct OutgoingPacket {
u32 ack_number { 0 };
ByteBuffer buffer;
int tx_counter { 0 };
Time tx_time {};
};
Lock m_not_acked_lock { "TCPSocket unacked packets" };
SinglyLinkedList<OutgoingPacket> m_not_acked;
u32 m_duplicate_acks { 0 };
u32 m_last_ack_number_sent { 0 };
Time m_last_ack_sent_time;
};
}
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