package tcpip
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type error

The type for UDP errors.

val pp_error : error Fmt.t

pp is the pretty-printer for errors.

type buffer = Cstruct.t

The type for memory buffers.

type ipaddr = Ipaddr.V4.t

The type for an IP address representations.

type ipinput = direct_ipv4_input

The type for input function continuation to pass onto the underlying IP stack. This will normally be a NOOP for a conventional kernel, but a direct implementation will parse the buffer.

include Mirage_device.S with type 'a io = 'a Lwt.t
type 'a io = 'a Lwt.t

The type for potentially blocking I/O operation

type t

The type representing the internal state of the device

val disconnect : t -> unit io

Disconnect from the device. While this might take some time to complete, it can never result in an error.

type callback = src:ipaddr -> dst:ipaddr -> src_port:int -> buffer -> unit io

The type for callback functions that adds the UDP metadata for src and dst IP addresses, the src_port of the connection and the buffer payload of the datagram.

val input : listeners:(dst_port:int -> callback option) -> t -> ipinput

input listeners t demultiplexes incoming datagrams based on their destination port. The listeners callback will either return a concrete handler or a None, which results in the datagram being dropped.

val write : ?src_port:int -> dst:ipaddr -> dst_port:int -> t -> buffer -> (unit, error) result io

write ~src_port ~dst ~dst_port udp data is a thread that writes data from an optional src_port to a dst and dst_port IPv4 address pair.