package tcpip

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tcpip
- Tcpip
  - Ip
    
    S
  - Stack
    
    V4V6
    
    IP
    
    TCP
    
    UDP
  - Tcp
    
    Keepalive
    
    S
  - Udp
    
    S
tcpip.checksum
- Tcpip_checksum
tcpip.icmpv4
- Icmpv4
  - Make
    
    I
  - S
- Icmpv4_packet
  - Marshal
  - Unmarshal
- Icmpv4_wire
tcpip.icmpv4-socket
- Icmpv4_socket
tcpip.ipv4
- Fragments
  - Cache
  - K
  - V
- Ipv4_packet
  - Marshal
  - Unmarshal
- Ipv4_wire
- Routing
  - Make
    
    A
    
    Log
- Static_ipv4
  - Make
    
    A
    
    E
    
    R
    
    Entropy
tcpip.ipv6
- Ipv6
  - Make
    
    E
    
    N
    
    R
    
    Entropy
    
    T
- Ipv6_wire
  - Icmpv6
  - Llopt
  - Na
  - Ns
  - Opt
  - Opt_prefix
  - Pingv6
  - Ra
  - Redirect
  - Rs
- Ndpv6
tcpip.stack-direct
- Tcpip_stack_direct
  - IPV4V6
    
    Ipv4
    
    Ipv6
  - MakeV4V6
    
    Arpv4
    
    Ethernet
    
    Icmpv4
    
    Ip
    
    Netif
    
    Random
    
    Entropy
    
    Tcp
    
    Time
    
    Udp
  - TCPV4V6
    
    S
    
    IP
    
    TCP
    
    UDP
tcpip.stack-socket
tcpip.tcp
- Tcp
  - Ack
    
    Delayed
    
    T
    
    Immediate
    
    M
  - Flow
    
    Make
    
    IP
    
    R
    
    Entropy
    
    TM
  - Keepalive
    
    Make
    
    T
  - Options
  - Segment
    
    Rx
    
    ACK
    
    T
    
    Tx
    
    Time
  - Sequence
  - State
    
    Make
    
    Time
  - Stats
    
    Gc
  - Tcp_packet
    
    Marshal
    
    Unmarshal
  - Tcp_wire
  - Tcptimer
    
    Make
    
    T
  - User_buffer
    
    Rx
    
    Tx
    
    TXS
    
    Time
  - Window
    
    Make
  - Wire
    
    Make
    
    Ip
tcpip.tcp_socket_options
- Tcp_socket_options
tcpip.tcpv4v6-socket
- Tcp_socket
- Tcpv4v6_socket
tcpip.udp
- Udp
  - Make
    
    IP
    
    R
    
    Entropy
- Udp_packet
  - Marshal
  - Unmarshal
- Udp_wire
tcpip.udpv4v6-socket
- Udpv4v6_socket
  - Log

Legend:
Library
Module
Module type
Parameter
Class
Class type

TCP keepalives.

A TCP implementation may send "keep-alives" (empty TCP ACKs with the sequence number set to one less than the current sequence number for the connection) in order to provoke the peer to respond with an ACK of the current sequence number. If the peer doesn't recognise the connection (e.g. because the connection state has been dropped) then it will return a RST; if the peer (or the network in-between) fails to respond to a configured number of repeated probes then the connection is assumed to be lost.

type action = [

| `SendProbe
(*
we should send a keep-alive now
*)
| `Wait of Duration.t
(*
sleep for a given number of nanoseconds
*)
| `Close
(*
connection should be closed
*)

]

An I/O action to perform

type state

State of a current connection

val alive : state

An alive connection

val next : 
  configuration:Tcpip.Tcp.Keepalive.t ->
  ns:int64 ->
  state ->
  action * state

next ~configuration ~ns state returns the action we should take given that we last received a packet ns nanoseconds ago and the new state of the connection

module Make (T : Mirage_time.S) (Clock : Mirage_clock.MCLOCK) : sig ... end