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Kernel: Factor out TCP parts of IPv4Socket into a TCPSocket class.
This commit is contained in:
Andreas Kling
parent
8014473918
commit
d2176eddfc
7 changed files with 255 additions and 160 deletions
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@ -1,4 +1,5 @@
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#include <Kernel/IPv4Socket.h>
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#include <Kernel/TCPSocket.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/Process.h>
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#include <Kernel/NetworkAdapter.h>
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@ -19,17 +20,17 @@ Lockable<HashMap<word, IPv4Socket*>>& IPv4Socket::sockets_by_udp_port()
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return *s_map;
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}
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Lockable<HashMap<word, IPv4Socket*>>& IPv4Socket::sockets_by_tcp_port()
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Lockable<HashMap<word, TCPSocket*>>& IPv4Socket::sockets_by_tcp_port()
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{
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static Lockable<HashMap<word, IPv4Socket*>>* s_map;
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static Lockable<HashMap<word, TCPSocket*>>* s_map;
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if (!s_map)
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s_map = new Lockable<HashMap<word, IPv4Socket*>>;
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s_map = new Lockable<HashMap<word, TCPSocket*>>;
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return *s_map;
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}
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IPv4SocketHandle IPv4Socket::from_tcp_port(word port)
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TCPSocketHandle IPv4Socket::from_tcp_port(word port)
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{
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RetainPtr<IPv4Socket> socket;
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RetainPtr<TCPSocket> socket;
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{
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LOCKER(sockets_by_tcp_port().lock());
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auto it = sockets_by_tcp_port().resource().find(port);
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@ -65,6 +66,8 @@ Lockable<HashTable<IPv4Socket*>>& IPv4Socket::all_sockets()
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Retained<IPv4Socket> IPv4Socket::create(int type, int protocol)
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{
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if (type == SOCK_STREAM)
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return TCPSocket::create(protocol);
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return adopt(*new IPv4Socket(type, protocol));
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}
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@ -125,28 +128,7 @@ KResult IPv4Socket::connect(const sockaddr* address, socklen_t address_size)
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m_destination_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
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m_destination_port = ntohs(ia.sin_port);
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if (type() != SOCK_STREAM)
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return KSuccess;
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// FIXME: Figure out the adapter somehow differently.
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auto* adapter = NetworkAdapter::from_ipv4_address(IPv4Address(192, 168, 5, 2));
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if (!adapter)
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ASSERT_NOT_REACHED();
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allocate_source_port_if_needed();
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m_tcp_sequence_number = 0;
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m_tcp_ack_number = 0;
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send_tcp_packet(*adapter, TCPFlags::SYN);
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m_tcp_state = TCPState::Connecting1;
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current->set_blocked_socket(this);
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block(Process::BlockedConnect);
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Scheduler::yield();
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ASSERT(is_connected());
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return KSuccess;
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return protocol_connect();
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}
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void IPv4Socket::attach_fd(SocketRole)
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@ -205,7 +187,7 @@ void IPv4Socket::allocate_source_port_if_needed()
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auto it = sockets_by_tcp_port().resource().find(port);
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if (it == sockets_by_tcp_port().resource().end()) {
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m_source_port = port;
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sockets_by_tcp_port().resource().set(port, this);
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sockets_by_tcp_port().resource().set(port, static_cast<TCPSocket*>(this));
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return;
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}
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}
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@ -213,83 +195,6 @@ void IPv4Socket::allocate_source_port_if_needed()
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}
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}
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struct [[gnu::packed]] TCPPseudoHeader {
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IPv4Address source;
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IPv4Address destination;
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byte zero;
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byte protocol;
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NetworkOrdered<word> payload_size;
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};
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NetworkOrdered<word> IPv4Socket::compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket& packet, word payload_size)
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{
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TCPPseudoHeader pseudo_header { source, destination, 0, (byte)IPv4Protocol::TCP, sizeof(TCPPacket) + payload_size };
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dword checksum = 0;
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auto* w = (const NetworkOrdered<word>*)&pseudo_header;
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for (size_t i = 0; i < sizeof(pseudo_header) / sizeof(word); ++i) {
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checksum += w[i];
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if (checksum > 0xffff)
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checksum = (checksum >> 16) + (checksum & 0xffff);
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}
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w = (const NetworkOrdered<word>*)&packet;
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for (size_t i = 0; i < sizeof(packet) / sizeof(word); ++i) {
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checksum += w[i];
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if (checksum > 0xffff)
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checksum = (checksum >> 16) + (checksum & 0xffff);
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}
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ASSERT(packet.data_offset() * 4 == sizeof(TCPPacket));
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w = (const NetworkOrdered<word>*)packet.payload();
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for (size_t i = 0; i < payload_size / sizeof(word); ++i) {
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checksum += w[i];
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if (checksum > 0xffff)
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checksum = (checksum >> 16) + (checksum & 0xffff);
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}
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if (payload_size & 1) {
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word expanded_byte = ((const byte*)packet.payload())[payload_size - 1];
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checksum += expanded_byte;
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if (checksum > 0xffff)
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checksum = (checksum >> 16) + (checksum & 0xffff);
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}
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return ~(checksum & 0xffff);
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}
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void IPv4Socket::send_tcp_packet(NetworkAdapter& adapter, word flags, const void* payload, size_t payload_size)
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{
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auto buffer = ByteBuffer::create_zeroed(sizeof(TCPPacket) + payload_size);
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auto& tcp_packet = *(TCPPacket*)(buffer.pointer());
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ASSERT(m_source_port);
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tcp_packet.set_source_port(m_source_port);
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tcp_packet.set_destination_port(m_destination_port);
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tcp_packet.set_window_size(1024);
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tcp_packet.set_sequence_number(m_tcp_sequence_number);
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tcp_packet.set_data_offset(sizeof(TCPPacket) / sizeof(dword));
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tcp_packet.set_flags(flags);
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if (flags & TCPFlags::ACK)
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tcp_packet.set_ack_number(m_tcp_ack_number);
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if (flags == TCPFlags::SYN) {
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++m_tcp_sequence_number;
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} else {
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m_tcp_sequence_number += payload_size;
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}
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memcpy(tcp_packet.payload(), payload, payload_size);
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tcp_packet.set_checksum(compute_tcp_checksum(adapter.ipv4_address(), m_destination_address, tcp_packet, payload_size));
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kprintf("sending tcp packet from %s:%u to %s:%u with (%s %s) seq_no=%u, ack_no=%u\n",
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adapter.ipv4_address().to_string().characters(),
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source_port(),
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m_destination_address.to_string().characters(),
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m_destination_port,
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tcp_packet.has_syn() ? "SYN" : "",
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tcp_packet.has_ack() ? "ACK" : "",
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tcp_packet.sequence_number(),
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tcp_packet.ack_number()
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);
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adapter.send_ipv4(MACAddress(), m_destination_address, IPv4Protocol::TCP, move(buffer));
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}
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ssize_t IPv4Socket::sendto(const void* data, size_t data_length, int flags, const sockaddr* addr, socklen_t addr_length)
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{
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(void)flags;
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@ -338,10 +243,8 @@ ssize_t IPv4Socket::sendto(const void* data, size_t data_length, int flags, cons
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return data_length;
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}
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if (type() == SOCK_STREAM) {
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send_tcp_packet(*adapter, TCPFlags::PUSH | TCPFlags::ACK, data, data_length);
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return data_length;
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}
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if (type() == SOCK_STREAM)
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return protocol_send(data, data_length);
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ASSERT_NOT_REACHED();
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}
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@ -409,17 +312,8 @@ ssize_t IPv4Socket::recvfrom(void* buffer, size_t buffer_length, int flags, sock
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return udp_packet.length() - sizeof(UDPPacket);
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}
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if (type() == SOCK_STREAM) {
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auto& tcp_packet = *static_cast<const TCPPacket*>(ipv4_packet.payload());
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size_t payload_size = packet_buffer.size() - sizeof(IPv4Packet) - tcp_packet.header_size();
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ASSERT(buffer_length >= payload_size);
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if (addr) {
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auto& ia = *(sockaddr_in*)addr;
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ia.sin_port = htons(tcp_packet.destination_port());
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}
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memcpy(buffer, tcp_packet.payload(), payload_size);
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return payload_size;
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}
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if (type() == SOCK_STREAM)
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return protocol_receive(packet_buffer, buffer, buffer_length, flags, addr, addr_length);
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ASSERT_NOT_REACHED();
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}
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