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;; This file is part of scheme-GNUnet.
;; Copyright (C) 2021 Maxime Devos
;;
;; scheme-GNUnet is free software: you can redistribute it and/or modify it
;; under the terms of the GNU Affero General Public License as published
;; by the Free Software Foundation, either version 3 of the License,
;; or (at your option) any later version.
;;
;; scheme-GNUnet is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; Affero General Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
;; SPDX-License-Identifier: AGPL3.0-or-later
;; Description from RFC 792:
;; [...]
;; ICMP messages are sent in several situations: for example, when a
;; datagram cannot reach its destination, when the gateway does not have
;; the buffering capacity to forward a datagram, and when the gateway
;; can direct the host to send traffic on a shorter route.
;; [...]
;; While (scheme-)GNUnet does not interect much with the ICMP
;; protocol (except VPN, maybe?), understanding ICMP somewhat
;; can be useful for printing informative error messages.
;;
;; (On Linux, IP_RECVERR can be used on some Internet sockets
;; (but not for SOCK_STREAM) to receive some ICMP errors.)
(define-library (gnu gnunet icmp struct)
(export icmp-type
icmp-type?
icmp-code/destination-unreachable
icmp-code/time-exceeded
icmp-code/parameter-problem
icmp-code/destination-unreachable?
icmp-code/time-exceeded?
icmp-code/parameter-problem?
/icmp/destination-unreachable
/icmp/time-exceeded
/icmp/parameter-problem)
(import (only (gnu extractor enum)
define-enumeration value)
(only (gnu gnunet netstruct syntactic)
define-type structure/packed)
(only (gnu gnunet netstruct procedural)
u8)
(only (rnrs base) begin quote))
(begin
;; Internet RFC 792
(define-enumeration (icmp-type icmp-type?)
(#:documentation "Type of ICMP packet")
(#:max 256)
(#:known
(value
(symbol icmp:echo-reply)
(index 0))
(value
(symbol icmp:destination-unreachable)
(index 3))
(value
(symbol icmp:source-quench)
(index 4))
(value
(symbol icmp:redirect)
(index 5))
(value
(symbol icmp:echo)
(index 8))
(value
(symbol icmp:time-exceeded)
(index 11))
(value
(symbol icmp:parameter-problem)
(index 12))
(value
(symbol icmp:timestamp)
(index 13))
(value
(symbol icmp:timestamp-reply)
(index 14))
(value
(symbol icmp:information-request)
(index 15))
(value
(symbol icmp:information-reply)
(index 16))))
(define-enumeration (icmp-code/destination-unreachable
icmp-code/destination-unreachable?)
(#:documentation "something is unreachable")
(#:max 256)
(#:known
(value
(symbol icmp:network-unreachable)
(index 0))
(value
(symbol icmp:host-unreachable)
(index 1))
(value
(symbol icmp:protocol-unreachable)
(index 2))
(value
(symbol icmp:port-unreachable)
(index 3))
(value
(symbol icmp:fragmentation-needed)
(index 4))
(value
(symbol icmp:source-route-failed)
(index 5))))
(define-enumeration (icmp-code/time-exceeded
icmp-code/time-exceeded?)
(#:documentation "time-out")
(#:max 256)
(#:known
(value
(symbol icmp:ttl-exceeded-in-transit)
(index 0))
(value
(symbol icmp:fragment-reassembly-time-exceeded)
(index 1))))
(define-enumeration (icmp-code/parameter-problem
icmp-code/parameter-problem?)
(#:documentation "incorrect datagram headers")
(#:max 256)
(#:known
(value
;; provisional name
(symbol icmp:pointer-indicates-the-error)
(index 0))))
(define-type /icmp/destination-unreachable
(structure/packed
(synopsis "a")
(documentation
"Followed by the internet header + 64 bits of the datagram data")
(field (type u8)
(properties '((enum-type icmp-type)
(enum-value icmp:destination-unreachable))))
(field (code u8)
(properties '((enum-type icmp-code/destination-unreachable))))
(field (unused u8))))
(define-type /icmp/time-exceeded
(structure/packed
(documentation
"Followed by the internet header + 64 bits of the datagram data")
(field (type u8)
(properties '((enum-type icmp-type)
(enum-value icmp:time-exceeded))))
(field (code u8)
(properties '((enum-type icmp-code/time-exceeded))))))
(define-type /icmp/parameter-problem
(structure/packed
(documentation
"Followed by the internet header + 64 bits of the datagram data")
(field (type u8)
(properties '((enum-type icmp-type)
(enum-value icmp:parameter-problem))))
(field (code u8)
(properties '((enum-type icmp-code/parameter-problem))))
(field (parameter u8)
(synopsis "If code is 0, the IP option type"))))))
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