package tcpip
OCaml TCP/IP networking stack, used in MirageOS
Install
Dune Dependency
Authors
Maintainers
Sources
tcpip-v6.4.0.tbz
sha256=6e32bf540d291e9b7325cb3dd00df2f695533e009c46ea534d5518b9492c7348
sha512=2e9f9ca2eeac637599eb48e087b4632598539f1c76f9251758995c7eedeb723f8b951d557a2a53b85a58d50a04e68e15598581f88fca8997733e800fcfca422b
doc/src/tcpip.tcp/ack.ml.html
Source file ack.ml
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(* * Copyright (c) 2010 Anil Madhavapeddy <anil@recoil.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *) open Lwt.Infix (* General signature for all the ack modules *) module type M = sig type t (* ack: put mvar to trigger the transmission of an ack *) val t : send_ack:Sequence.t Lwt_mvar.t -> last:Sequence.t -> t (* called when new data is received *) val receive: t -> Sequence.t -> unit Lwt.t (* called when new data is received *) val pushack: t -> Sequence.t -> unit Lwt.t (* called when an ack is transmitted from elsewhere *) val transmit: t -> Sequence.t -> unit Lwt.t end (* Transmit ACKs immediately, the dumbest (and simplest) way *) module Immediate : M = struct type t = { mutable send_ack: Sequence.t Lwt_mvar.t; mutable pushpending: bool; } let t ~send_ack ~last:_ = let pushpending = false in {send_ack; pushpending} let pushack t ack_number = t.pushpending <- true; Lwt_mvar.put t.send_ack ack_number let receive t ack_number = match t.pushpending with | true -> Lwt.return_unit | false -> pushack t ack_number let transmit t _ = t.pushpending <- false; Lwt.return_unit end (* Delayed ACKs *) module Delayed (Time:Mirage_time.S) : M = struct module TT = Tcptimer.Make(Time) type delayed_r = { send_ack: Sequence.t Lwt_mvar.t; mutable delayedack: Sequence.t; mutable delayed: bool; mutable pushpending: bool; } type t = { r: delayed_r; timer: Tcptimer.t; } let transmitacknow r ack_number = Lwt_mvar.put r.send_ack ack_number let transmitack r ack_number = match r.pushpending with | true -> Lwt.return_unit | false -> r.pushpending <- true; transmitacknow r ack_number let ontimer r s = match r.delayed with | false -> Lwt.return Tcptimer.Stoptimer | true -> match r.delayedack = s with | false -> Lwt.return (Tcptimer.Continue r.delayedack) | true -> r.delayed <- false; transmitack r s >>= fun () -> Lwt.return Tcptimer.Stoptimer let t ~send_ack ~last : t = let pushpending = false in let delayed = false in let delayedack = last in let r = {send_ack; delayedack; delayed; pushpending} in let expire = ontimer r in let period_ns = Duration.of_ms 100 in let timer = TT.t ~period_ns ~expire in {r; timer} (* Advance the received ACK count *) let receive t ack_number = match t.r.delayed with | true -> t.r.delayed <- false; transmitack t.r ack_number | false -> t.r.delayed <- true; t.r.delayedack <- ack_number; TT.start t.timer ack_number (* Force out an ACK *) let pushack t ack_number = transmitacknow t.r ack_number (* Indicate that an ACK has been transmitted *) let transmit t _ = t.r.delayed <- false; t.r.pushpending <- false; Lwt.return_unit end
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