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Kernel: Add support for TCP window size scaling

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This should allow us to eventually properly saturate high-bandwidth
network links when using TCP, once other nonoptimal parts of our
network stack are improved.
This commit is contained in:
Idan Horowitz 2023-12-26 21:05:15 +02:00 • committed by Andreas Kling
parent 2c51ff763b
commit 785c9d5c2b
6 changed files with 124 additions and 14 deletions
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68
Kernel/Net/TCP.h
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@ -21,21 +21,59 @@ struct TCPFlags {
};
};
class [[gnu::packed]] TCPOptionMSS {
enum class TCPOptionKind : u8 {
End = 0,
Nop = 1,
MSS = 2,
WindowScale = 3,
SACKPermitted = 4,
SACK = 5,
Timestamp = 6,
};
class [[gnu::packed]] TCPOption {
public:
TCPOptionKind kind() const { return m_kind; }
u8 length() const { return m_length; }
protected:
TCPOption(TCPOptionKind kind, u8 length)
: m_kind(kind)
, m_length(length) {};
private:
TCPOptionKind m_kind { TCPOptionKind::End };
u8 m_length { sizeof(TCPOption) };
};
class [[gnu::packed]] TCPOptionMSS : public TCPOption {
public:
TCPOptionMSS(u16 value)
: m_value(value)
: TCPOption(TCPOptionKind::MSS, sizeof(TCPOptionMSS))
, m_value(value)
{
}
u16 value() const { return m_value; }
private:
u8 m_option_kind { 0x02 };
u8 m_option_length { sizeof(TCPOptionMSS) };
NetworkOrdered<u16> m_value;
};
class [[gnu::packed]] TCPOptionWindowScale : public TCPOption {
public:
TCPOptionWindowScale(u8 value)
: TCPOption(TCPOptionKind::WindowScale, sizeof(TCPOptionWindowScale))
, m_value(value)
{
}
u8 value() const { return m_value; }
private:
NetworkOrdered<u8> m_value;
};
static_assert(AssertSize<TCPOptionMSS, 4>());
class [[gnu::packed]] TCPPacket {
@ -80,6 +118,28 @@ public:
void const* payload() const { return ((u8 const*)this) + header_size(); }
void* payload() { return ((u8*)this) + header_size(); }
template<typename Callback>
void for_each_option(Callback callback) const
{
auto const* next_option = (u8 const*)this + sizeof(TCPPacket);
auto const* options_end = payload();
while (next_option < options_end) {
if ((size_t)options_end - (size_t)next_option < sizeof(TCPOption))
return; // Not enough space left for another option
auto const* option = (TCPOption const*)next_option;
if (option->kind() == TCPOptionKind::End)
return;
if (option->kind() == TCPOptionKind::Nop) {
next_option += 1;
continue;
}
if (option->length() < sizeof(TCPOption))
return; // minimal option length
callback(*option);
next_option += option->length();
}
}
private:
NetworkOrdered<u16> m_source_port;
NetworkOrdered<u16> m_destination_port;