RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 15:28:11 +00:00
Code Issues Activity Actions

Kernel: Trigger TCP fast retransmission when we encounter lost packets

Browse source 
When we receive a TCP packet with a sequence number that is not what
we expected we have lost one or more packets. We can signal this to
the sender by sending a TCP ACK with the previous ack number so that
they can resend the missing TCP fragments.
This commit is contained in:
Gunnar Beutner 2021-05-12 08:13:53 +02:00 • committed by Andreas Kling
parent 7272127927
commit ffc6b714b0
2 changed files with 14 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

7
Kernel/Net/TCPSocket.h
View file

@ -128,6 +128,11 @@ public:
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_tcp_packet(u16 flags, const UserOrKernelBuffer* = nullptr, size_t = 0);
void send_outgoing_packets(RoutingDecision&);
void receive_tcp_packet(const TCPPacket&, u16 size);
@ -187,6 +192,8 @@ private:
Lock m_not_acked_lock { "TCPSocket unacked packets" };
SinglyLinkedList<OutgoingPacket> m_not_acked;
u32 m_duplicate_acks { 0 };
};
}