IPv4: Rename source/destination in socket classes to local/peer.

It was way too ambiguous who's the source and who's the destination, and it
didn't really follow a logical pattern. "Local port" vs "Peer port" is super
obvious, so let's call it that.

7 files changed, 80 insertions, 88 deletions

diff --git a/Kernel/Net/IPv4Socket.cpp b/Kernel/Net/IPv4Socket.cpp
index 697e24f1d9..f6b4b96ed6 100644
--- a/Kernel/Net/IPv4Socket.cpp
+++ b/Kernel/Net/IPv4Socket.cpp
@@ -51,7 +51,7 @@ bool IPv4Socket::get_address(sockaddr* address, socklen_t* address_size)
     // FIXME: Look into what fallback behavior we should have here.
     if (*address_size != sizeof(sockaddr_in))
         return false;
-    memcpy(address, &m_destination_address, sizeof(sockaddr_in));
+    memcpy(address, &m_peer_address, sizeof(sockaddr_in));
     *address_size = sizeof(sockaddr_in);
     return true;
 }
@@ -65,10 +65,10 @@ KResult IPv4Socket::bind(const sockaddr* address, socklen_t address_size)
         return KResult(-EINVAL);
 
     auto& ia = *(const sockaddr_in*)address;
-    m_source_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
-    m_source_port = ntohs(ia.sin_port);
+    m_local_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
+    m_local_port = ntohs(ia.sin_port);
 
-    dbgprintf("IPv4Socket::bind %s{%p} to port %u\n", class_name(), this, m_source_port);
+    dbgprintf("IPv4Socket::bind %s{%p} to port %u\n", class_name(), this, m_local_port);
 
     return protocol_bind();
 }
@@ -82,8 +82,8 @@ KResult IPv4Socket::connect(FileDescriptor& descriptor, const sockaddr* address,
         return KResult(-EINVAL);
 
     auto& ia = *(const sockaddr_in*)address;
-    m_destination_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
-    m_destination_port = ntohs(ia.sin_port);
+    m_peer_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
+    m_peer_port = ntohs(ia.sin_port);
 
     return protocol_connect(descriptor, should_block);
 }
@@ -122,14 +122,14 @@ bool IPv4Socket::can_write(FileDescriptor&) const
     return is_connected();
 }
 
-int IPv4Socket::allocate_source_port_if_needed()
+int IPv4Socket::allocate_local_port_if_needed()
 {
-    if (m_source_port)
-        return m_source_port;
-    int port = protocol_allocate_source_port();
+    if (m_local_port)
+        return m_local_port;
+    int port = protocol_allocate_local_port();
     if (port < 0)
         return port;
-    m_source_port = (word)port;
+    m_local_port = (word)port;
     return port;
 }
 
@@ -146,22 +146,22 @@ ssize_t IPv4Socket::sendto(FileDescriptor&, const void* data, size_t data_length
         }
 
         auto& ia = *(const sockaddr_in*)addr;
-        m_destination_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
-        m_destination_port = ntohs(ia.sin_port);
+        m_peer_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
+        m_peer_port = ntohs(ia.sin_port);
     }
 
-    auto* adapter = adapter_for_route_to(m_destination_address);
+    auto* adapter = adapter_for_route_to(m_peer_address);
     if (!adapter)
         return -EHOSTUNREACH;
 
-    int rc = allocate_source_port_if_needed();
+    int rc = allocate_local_port_if_needed();
     if (rc < 0)
         return rc;
 
-    kprintf("sendto: destination=%s:%u\n", m_destination_address.to_string().characters(), m_destination_port);
+    kprintf("sendto: destination=%s:%u\n", m_peer_address.to_string().characters(), m_peer_port);
 
     if (type() == SOCK_RAW) {
-        adapter->send_ipv4(MACAddress(), m_destination_address, (IPv4Protocol)protocol(), ByteBuffer::copy(data, data_length));
+        adapter->send_ipv4(MACAddress(), m_peer_address, (IPv4Protocol)protocol(), ByteBuffer::copy(data, data_length));
         return data_length;
     }
 
@@ -175,26 +175,21 @@ ssize_t IPv4Socket::recvfrom(FileDescriptor& descriptor, void* buffer, size_t bu
         return -EINVAL;
 
 #ifdef IPV4_SOCKET_DEBUG
-    kprintf("recvfrom: type=%d, source_port=%u\n", type(), source_port());
+    kprintf("recvfrom: type=%d, local_port=%u\n", type(), local_port());
 #endif
 
-    IPv4Address peer_address;
-    word peer_port = 0;
-    ByteBuffer packet_buffer;
+    ReceivedPacket packet;
     {
         LOCKER(lock());
         if (!m_receive_queue.is_empty()) {
-            auto packet = m_receive_queue.take_first();
-            packet_buffer = packet.data;
-            peer_address = packet.source_address;
-            peer_port = packet.source_port;
+            packet = m_receive_queue.take_first();
             m_can_read = !m_receive_queue.is_empty();
 #ifdef IPV4_SOCKET_DEBUG
-            kprintf("IPv4Socket(%p): recvfrom without blocking %d bytes, packets in queue: %d\n", this, packet_buffer.size(), m_receive_queue.size_slow());
+            kprintf("IPv4Socket(%p): recvfrom without blocking %d bytes, packets in queue: %d\n", this, packet.data.size(), m_receive_queue.size_slow());
 #endif
         }
     }
-    if (packet_buffer.is_null()) {
+    if (packet.data.is_null()) {
         if (protocol_is_disconnected()) {
             kprintf("IPv4Socket{%p} is protocol-disconnected, returning 0 in recvfrom!\n", this);
             return 0;
@@ -210,23 +205,20 @@ ssize_t IPv4Socket::recvfrom(FileDescriptor& descriptor, void* buffer, size_t bu
         }
         ASSERT(m_can_read);
         ASSERT(!m_receive_queue.is_empty());
-        auto packet = m_receive_queue.take_first();
-        packet_buffer = packet.data;
-        peer_address = packet.source_address;
-        peer_port = packet.source_port;
+        packet = m_receive_queue.take_first();
         m_can_read = !m_receive_queue.is_empty();
 #ifdef IPV4_SOCKET_DEBUG
-        kprintf("IPv4Socket(%p): recvfrom with blocking %d bytes, packets in queue: %d\n", this, packet_buffer.size(), m_receive_queue.size_slow());
+        kprintf("IPv4Socket(%p): recvfrom with blocking %d bytes, packets in queue: %d\n", this, packet.data.size(), m_receive_queue.size_slow());
 #endif
     }
-    ASSERT(!packet_buffer.is_null());
-    auto& ipv4_packet = *(const IPv4Packet*)(packet_buffer.pointer());
+    ASSERT(!packet.data.is_null());
+    auto& ipv4_packet = *(const IPv4Packet*)(packet.data.pointer());
 
     if (addr) {
-        dbgprintf("Incoming packet is from: %s:%u\n", peer_address.to_string().characters(), peer_port);
+        dbgprintf("Incoming packet is from: %s:%u\n", packet.peer_address.to_string().characters(), packet.peer_port);
         auto& ia = *(sockaddr_in*)addr;
-        memcpy(&ia.sin_addr, &peer_address, sizeof(IPv4Address));
-        ia.sin_port = htons(peer_port);
+        memcpy(&ia.sin_addr, &packet.peer_address, sizeof(IPv4Address));
+        ia.sin_port = htons(packet.peer_port);
         ia.sin_family = AF_INET;
         ASSERT(addr_length);
         *addr_length = sizeof(sockaddr_in);
@@ -238,7 +230,7 @@ ssize_t IPv4Socket::recvfrom(FileDescriptor& descriptor, void* buffer, size_t bu
         return ipv4_packet.payload_size();
     }
 
-    return protocol_receive(packet_buffer, buffer, buffer_length, flags, addr, addr_length);
+    return protocol_receive(packet.data, buffer, buffer_length, flags, addr, addr_length);
 }
 
 void IPv4Socket::did_receive(const IPv4Address& source_address, word source_port, ByteBuffer&& packet)
diff --git a/Kernel/Net/IPv4Socket.h b/Kernel/Net/IPv4Socket.h
index 47ec8804f3..3d7b145293 100644
--- a/Kernel/Net/IPv4Socket.h
+++ b/Kernel/Net/IPv4Socket.h
@@ -32,27 +32,27 @@ public:
     virtual ssize_t sendto(FileDescriptor&, const void*, size_t, int, const sockaddr*, socklen_t) override;
     virtual ssize_t recvfrom(FileDescriptor&, void*, size_t, int flags, sockaddr*, socklen_t*) override;
 
-    void did_receive(const IPv4Address& source_address, word source_port, ByteBuffer&&);
+    void did_receive(const IPv4Address& peer_address, word peer_port, ByteBuffer&&);
 
-    const IPv4Address& source_address() const;
-    word source_port() const { return m_source_port; }
-    void set_source_port(word port) { m_source_port = port; }
+    const IPv4Address& local_address() const;
+    word local_port() const { return m_local_port; }
+    void set_local_port(word port) { m_local_port = port; }
 
-    const IPv4Address& destination_address() const { return m_destination_address; }
-    word destination_port() const { return m_destination_port; }
-    void set_destination_port(word port) { m_destination_port = port; }
+    const IPv4Address& peer_address() const { return m_peer_address; }
+    word peer_port() const { return m_peer_port; }
+    void set_peer_port(word port) { m_peer_port = port; }
 
 protected:
     IPv4Socket(int type, int protocol);
     virtual const char* class_name() const override { return "IPv4Socket"; }
 
-    int allocate_source_port_if_needed();
+    int allocate_local_port_if_needed();
 
     virtual KResult protocol_bind() { return KSuccess; }
     virtual int protocol_receive(const ByteBuffer&, void*, size_t, int, sockaddr*, socklen_t*) { return -ENOTIMPL; }
     virtual int protocol_send(const void*, int) { return -ENOTIMPL; }
     virtual KResult protocol_connect(FileDescriptor&, ShouldBlock) { return KSuccess; }
-    virtual int protocol_allocate_source_port() { return 0; }
+    virtual int protocol_allocate_local_port() { return 0; }
     virtual bool protocol_is_disconnected() const { return false; }
 
 private:
@@ -61,22 +61,22 @@ private:
     bool m_bound { false };
     int m_attached_fds { 0 };
 
-    IPv4Address m_source_address;
-    IPv4Address m_destination_address;
+    IPv4Address m_local_address;
+    IPv4Address m_peer_address;
 
     DoubleBuffer m_for_client;
     DoubleBuffer m_for_server;
 
     struct ReceivedPacket {
-        IPv4Address source_address;
-        word source_port;
+        IPv4Address peer_address;
+        word peer_port;
         ByteBuffer data;
     };
 
     SinglyLinkedList<ReceivedPacket> m_receive_queue;
 
-    word m_source_port { 0 };
-    word m_destination_port { 0 };
+    word m_local_port { 0 };
+    word m_peer_port { 0 };
 
     dword m_bytes_received { 0 };
 
diff --git a/Kernel/Net/NetworkTask.cpp b/Kernel/Net/NetworkTask.cpp
index 680dfc33c8..bd8406376d 100644
--- a/Kernel/Net/NetworkTask.cpp
+++ b/Kernel/Net/NetworkTask.cpp
@@ -276,7 +276,7 @@ void handle_udp(const EthernetFrameHeader& eth, int frame_size)
     }
 
     ASSERT(socket->type() == SOCK_DGRAM);
-    ASSERT(socket->source_port() == udp_packet.destination_port());
+    ASSERT(socket->local_port() == udp_packet.destination_port());
     socket->did_receive(ipv4_packet.source(), udp_packet.source_port(), ByteBuffer::copy(&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
 }
 
@@ -317,7 +317,7 @@ void handle_tcp(const EthernetFrameHeader& eth, int frame_size)
     }
 
     ASSERT(socket->type() == SOCK_STREAM);
-    ASSERT(socket->source_port() == tcp_packet.destination_port());
+    ASSERT(socket->local_port() == tcp_packet.destination_port());
 
     if (tcp_packet.ack_number() != socket->sequence_number()) {
         kprintf("handle_tcp: ack/seq mismatch: got %u, wanted %u\n", tcp_packet.ack_number(), socket->sequence_number());
diff --git a/Kernel/Net/TCPSocket.cpp b/Kernel/Net/TCPSocket.cpp
index 6f73144791..acb3c47569 100644
--- a/Kernel/Net/TCPSocket.cpp
+++ b/Kernel/Net/TCPSocket.cpp
@@ -36,7 +36,7 @@ TCPSocket::TCPSocket(int protocol)
 TCPSocket::~TCPSocket()
 {
     LOCKER(sockets_by_port().lock());
-    sockets_by_port().resource().remove(source_port());
+    sockets_by_port().resource().remove(local_port());
 }
 
 Retained<TCPSocket> TCPSocket::create(int protocol)
@@ -60,7 +60,7 @@ int TCPSocket::protocol_receive(const ByteBuffer& packet_buffer, void* buffer, s
 
 int TCPSocket::protocol_send(const void* data, int data_length)
 {
-    auto* adapter = adapter_for_route_to(destination_address());
+    auto* adapter = adapter_for_route_to(peer_address());
     if (!adapter)
         return -EHOSTUNREACH;
     send_tcp_packet(TCPFlags::PUSH | TCPFlags::ACK, data, data_length);
@@ -70,14 +70,14 @@ int TCPSocket::protocol_send(const void* data, int data_length)
 void TCPSocket::send_tcp_packet(word flags, const void* payload, int payload_size)
 {
     // FIXME: Maybe the socket should be bound to an adapter instead of looking it up every time?
-    auto* adapter = adapter_for_route_to(destination_address());
+    auto* adapter = adapter_for_route_to(peer_address());
     ASSERT(adapter);
 
     auto buffer = ByteBuffer::create_zeroed(sizeof(TCPPacket) + payload_size);
     auto& tcp_packet = *(TCPPacket*)(buffer.pointer());
-    ASSERT(source_port());
-    tcp_packet.set_source_port(source_port());
-    tcp_packet.set_destination_port(destination_port());
+    ASSERT(local_port());
+    tcp_packet.set_source_port(local_port());
+    tcp_packet.set_destination_port(peer_port());
     tcp_packet.set_window_size(1024);
     tcp_packet.set_sequence_number(m_sequence_number);
     tcp_packet.set_data_offset(sizeof(TCPPacket) / sizeof(dword));
@@ -93,18 +93,18 @@ void TCPSocket::send_tcp_packet(word flags, const void* payload, int payload_siz
     }
 
     memcpy(tcp_packet.payload(), payload, payload_size);
-    tcp_packet.set_checksum(compute_tcp_checksum(adapter->ipv4_address(), destination_address(), tcp_packet, payload_size));
+    tcp_packet.set_checksum(compute_tcp_checksum(adapter->ipv4_address(), peer_address(), tcp_packet, payload_size));
     kprintf("sending tcp packet from %s:%u to %s:%u with (%s %s) seq_no=%u, ack_no=%u\n",
         adapter->ipv4_address().to_string().characters(),
-        source_port(),
-        destination_address().to_string().characters(),
-        destination_port(),
+        local_port(),
+        peer_address().to_string().characters(),
+        peer_port(),
         tcp_packet.has_syn() ? "SYN" : "",
         tcp_packet.has_ack() ? "ACK" : "",
         tcp_packet.sequence_number(),
         tcp_packet.ack_number()
     );
-    adapter->send_ipv4(MACAddress(), destination_address(), IPv4Protocol::TCP, move(buffer));
+    adapter->send_ipv4(MACAddress(), peer_address(), IPv4Protocol::TCP, move(buffer));
 }
 
 NetworkOrdered<word> TCPSocket::compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket& packet, word payload_size)
@@ -150,11 +150,11 @@ NetworkOrdered<word> TCPSocket::compute_tcp_checksum(const IPv4Address& source,
 
 KResult TCPSocket::protocol_connect(FileDescriptor& descriptor, ShouldBlock should_block)
 {
-    auto* adapter = adapter_for_route_to(destination_address());
+    auto* adapter = adapter_for_route_to(peer_address());
     if (!adapter)
         return KResult(-EHOSTUNREACH);
 
-    allocate_source_port_if_needed();
+    allocate_local_port_if_needed();
 
     m_sequence_number = 0;
     m_ack_number = 0;
@@ -171,7 +171,7 @@ KResult TCPSocket::protocol_connect(FileDescriptor& descriptor, ShouldBlock shou
     return KResult(-EINPROGRESS);
 }
 
-int TCPSocket::protocol_allocate_source_port()
+int TCPSocket::protocol_allocate_local_port()
 {
     static const word first_ephemeral_port = 32768;
     static const word last_ephemeral_port = 60999;
@@ -182,7 +182,7 @@ int TCPSocket::protocol_allocate_source_port()
     for (word port = first_scan_port;;) {
         auto it = sockets_by_port().resource().find(port);
         if (it == sockets_by_port().resource().end()) {
-            set_source_port(port);
+            set_local_port(port);
             sockets_by_port().resource().set(port, this);
             return port;
         }
@@ -203,8 +203,8 @@ bool TCPSocket::protocol_is_disconnected() const
 KResult TCPSocket::protocol_bind()
 {
     LOCKER(sockets_by_port().lock());
-    if (sockets_by_port().resource().contains(source_port()))
+    if (sockets_by_port().resource().contains(local_port()))
         return KResult(-EADDRINUSE);
-    sockets_by_port().resource().set(source_port(), this);
+    sockets_by_port().resource().set(local_port(), this);
     return KSuccess;
 }
diff --git a/Kernel/Net/TCPSocket.h b/Kernel/Net/TCPSocket.h
index a1ebce3a0d..c248b9d9ba 100644
--- a/Kernel/Net/TCPSocket.h
+++ b/Kernel/Net/TCPSocket.h
@@ -31,12 +31,12 @@ private:
     explicit TCPSocket(int protocol);
     virtual const char* class_name() const override { return "TCPSocket"; }
 
-    NetworkOrdered<word> compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket&, word payload_size);
+    static NetworkOrdered<word> compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket&, word payload_size);
 
     virtual int protocol_receive(const ByteBuffer&, void* buffer, size_t buffer_size, int flags, sockaddr* addr, socklen_t* addr_length) override;
     virtual int protocol_send(const void*, int) override;
     virtual KResult protocol_connect(FileDescriptor&, ShouldBlock) override;
-    virtual int protocol_allocate_source_port() override;
+    virtual int protocol_allocate_local_port() override;
     virtual bool protocol_is_disconnected() const override;
     virtual KResult protocol_bind() override;
 
diff --git a/Kernel/Net/UDPSocket.cpp b/Kernel/Net/UDPSocket.cpp
index 982bdd8606..ee3597e386 100644
--- a/Kernel/Net/UDPSocket.cpp
+++ b/Kernel/Net/UDPSocket.cpp
@@ -36,7 +36,7 @@ UDPSocket::UDPSocket(int protocol)
 UDPSocket::~UDPSocket()
 {
     LOCKER(sockets_by_port().lock());
-    sockets_by_port().resource().remove(source_port());
+    sockets_by_port().resource().remove(local_port());
 }
 
 Retained<UDPSocket> UDPSocket::create(int protocol)
@@ -59,25 +59,25 @@ int UDPSocket::protocol_receive(const ByteBuffer& packet_buffer, void* buffer, s
 
 int UDPSocket::protocol_send(const void* data, int data_length)
 {
-    auto* adapter = adapter_for_route_to(destination_address());
+    auto* adapter = adapter_for_route_to(peer_address());
     if (!adapter)
         return -EHOSTUNREACH;
     auto buffer = ByteBuffer::create_zeroed(sizeof(UDPPacket) + data_length);
     auto& udp_packet = *(UDPPacket*)(buffer.pointer());
-    udp_packet.set_source_port(source_port());
-    udp_packet.set_destination_port(destination_port());
+    udp_packet.set_source_port(local_port());
+    udp_packet.set_destination_port(peer_port());
     udp_packet.set_length(sizeof(UDPPacket) + data_length);
     memcpy(udp_packet.payload(), data, data_length);
     kprintf("sending as udp packet from %s:%u to %s:%u!\n",
         adapter->ipv4_address().to_string().characters(),
-        source_port(),
-        destination_address().to_string().characters(),
-        destination_port());
-    adapter->send_ipv4(MACAddress(), destination_address(), IPv4Protocol::UDP, move(buffer));
+        local_port(),
+        peer_address().to_string().characters(),
+        peer_port());
+    adapter->send_ipv4(MACAddress(), peer_address(), IPv4Protocol::UDP, move(buffer));
     return data_length;
 }
 
-int UDPSocket::protocol_allocate_source_port()
+int UDPSocket::protocol_allocate_local_port()
 {
     static const word first_ephemeral_port = 32768;
     static const word last_ephemeral_port = 60999;
@@ -88,7 +88,7 @@ int UDPSocket::protocol_allocate_source_port()
     for (word port = first_scan_port;;) {
         auto it = sockets_by_port().resource().find(port);
         if (it == sockets_by_port().resource().end()) {
-            set_source_port(port);
+            set_local_port(port);
             sockets_by_port().resource().set(port, this);
             return port;
         }
@@ -104,8 +104,8 @@ int UDPSocket::protocol_allocate_source_port()
 KResult UDPSocket::protocol_bind()
 {
     LOCKER(sockets_by_port().lock());
-    if (sockets_by_port().resource().contains(source_port()))
+    if (sockets_by_port().resource().contains(local_port()))
         return KResult(-EADDRINUSE);
-    sockets_by_port().resource().set(source_port(), this);
+    sockets_by_port().resource().set(local_port(), this);
     return KSuccess;
 }
diff --git a/Kernel/Net/UDPSocket.h b/Kernel/Net/UDPSocket.h
index 693f6eb349..ea94887754 100644
--- a/Kernel/Net/UDPSocket.h
+++ b/Kernel/Net/UDPSocket.h
@@ -9,17 +9,17 @@ public:
     static Retained<UDPSocket> create(int protocol);
     virtual ~UDPSocket() override;
 
-    static Lockable<HashMap<word, UDPSocket*>>& sockets_by_port();
     static UDPSocketHandle from_port(word);
 
 private:
     explicit UDPSocket(int protocol);
     virtual const char* class_name() const override { return "UDPSocket"; }
+    static Lockable<HashMap<word, UDPSocket*>>& sockets_by_port();
 
     virtual int protocol_receive(const ByteBuffer&, void* buffer, size_t buffer_size, int flags, sockaddr* addr, socklen_t* addr_length) override;
     virtual int protocol_send(const void*, int) override;
     virtual KResult protocol_connect(FileDescriptor&, ShouldBlock) override { return KSuccess; }
-    virtual int protocol_allocate_source_port() override;
+    virtual int protocol_allocate_local_port() override;
     virtual KResult protocol_bind() override;
 };