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Kernel: Refactor TCP/IP stack
This has several significant changes to the networking stack. * Significant refactoring of the TCP state machine. Right now it's probably more fragile than it used to be, but handles quite a lot more of the handshake process. * `TCPSocket` holds a `NetworkAdapter*`, assigned during `connect()` or `bind()`, whichever comes first. * `listen()` is now virtual in `Socket` and intended to be implemented in its child classes * `listen()` no longer works without `bind()` - this is a bit of a regression, but listening sockets didn't work at all before, so it's not possible to observe the regression. * A file is exposed at `/proc/net_tcp`, which is a JSON document listing the current TCP sockets with a bit of metadata. * There's an `ETHERNET_VERY_DEBUG` flag for dumping packet's content out to `kprintf`. It is, indeed, _very debug_.
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12 changed files with 446 additions and 84 deletions
63
Kernel/Net/IPv4SocketTuple.h
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63
Kernel/Net/IPv4SocketTuple.h
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/SinglyLinkedList.h>
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/Lock.h>
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#include <Kernel/Net/IPv4.h>
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#include <Kernel/Net/Socket.h>
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class IPv4SocketTuple {
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public:
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IPv4SocketTuple(IPv4Address local_address, u16 local_port, IPv4Address peer_address, u16 peer_port)
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: m_local_address(local_address)
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, m_local_port(local_port)
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, m_peer_address(peer_address)
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, m_peer_port(peer_port) {};
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IPv4Address local_address() const { return m_local_address; };
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u16 local_port() const { return m_local_port; };
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IPv4Address peer_address() const { return m_peer_address; };
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u16 peer_port() const { return m_peer_port; };
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bool operator==(const IPv4SocketTuple other) const
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{
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return other.local_address() == m_local_address && other.local_port() == m_local_port && other.peer_address() == m_peer_address && other.peer_port() == m_peer_port;
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};
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String to_string() const
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{
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return String::format(
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"%s:%d -> %s:%d",
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m_local_address.to_string().characters(),
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m_local_port,
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m_peer_address.to_string().characters(),
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m_peer_port);
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}
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private:
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IPv4Address m_local_address;
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u16 m_local_port { 0 };
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IPv4Address m_peer_address;
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u16 m_peer_port { 0 };
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};
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namespace AK {
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template<>
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struct Traits<IPv4SocketTuple> : public GenericTraits<IPv4SocketTuple> {
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static unsigned hash(const IPv4SocketTuple& tuple)
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{
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auto h1 = pair_int_hash(tuple.local_address().to_u32(), tuple.local_port());
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auto h2 = pair_int_hash(tuple.peer_address().to_u32(), tuple.peer_port());
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return pair_int_hash(h1, h2);
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}
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static void dump(const IPv4SocketTuple& tuple)
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{
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kprintf("%s", tuple.to_string().characters());
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}
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};
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}
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