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sctp.scm
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;;;
;;; Copyright (c) 2003-2012 Michael Tuexen
;;;
;;; All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or
;;; without modification, are permitted provided that the
;;; following conditions are met:
;;; 1. Redistributions of source code must retain the above
;;; copyright notice, this list of conditions and the
;;; following disclaimer.
;;; 2. Redistributions in binary form must reproduce the
;;; above copyright notice, this list of conditions and
;;; the following disclaimer in the documentation and/or
;;; other materials provided with the distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS
;;; ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
;;; BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
;;; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;;; DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
;;; BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
;;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
;;; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
;;; IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
;;; USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
;;; OF SUCH DAMAGE.
;;; $Id: sctp.scm,v 1.21 2014/08/30 19:50:20 tuexen Exp $
;;; Version 1.1.1
;;;
;;; History
;;; 06.12.2004 associate now takes os and mis.
;;; 06.12.2004 associate-from-port now takes os and mis
;;; 06.12.2004 accept-association now takes os and mis
;;; 06.12.2004 associate calls associate-from-port
;;; 07.12.2004 heartbeat message added.
;;; 19.07.2006 make-m3ua-beat-message added.
(define ulp-diameter 1)
(define ulp-echo 2)
(define ulp-http 3)
(define ulp-m3ua 4)
(define ulp-s1ap 5)
(define diameter-port 3868)
(define echo-port 7)
(define http-port 80)
(define m3ua-port 2905)
(define diameter-ppid 46)
(define echo-ppid 38)
(define http-ppid 63)
(define m3ua-ppid 3)
(define s1ap-ppid 18)
(define heartbeat-mode-discard 1)
(define heartbeat-mode-confirm 2)
(define heartbeat-mode-reflect 3)
(define get-header car)
(define get-local-tsn cadr)
(define get-remote-tsn caddr)
(define get-peer-tsn caddr)
(define get-peer-addr cadddr)
(define stt-test-result-passed 0)
(define stt-test-result-failed 1)
(define stt-test-result-unknown 2)
(define stt-test-result-not-applicable 253)
(define secondary-path-confirmed #f)
(define secondary-path-addr '())
(define (vector-filter vector predicate)
(list->vector (filter predicate (vector->list vector))))
(define (vector-find vector predicate)
(if (vector? vector)
(do ((index 0 (+ index 1)))
((or (= index (vector-length vector))
(predicate (vector-ref vector index)))
(if (= index (vector-length vector))
#f
(vector-ref vector index))))
#f))
(define* (sctp-receive-chunk predicate #:optional header)
(let* ((result (sctp-receive))
(chunks (cadr result))
(local-addr (caddr result))
(peer-addr (cadddr result)))
(cond
((and (not (equal? header #f))
(= (vector-length chunks) 1)
(heartbeat-chunk? (vector-ref chunks 0))
(or (= tester-heartbeat-mode heartbeat-mode-reflect)
(and (= tester-heartbeat-mode heartbeat-mode-confirm)
(not secondary-path-confirmed)
(equal? local-addr tester-addr-2)
(not (equal? tester-addr-1 tester-addr-2)))))
(sctp-send header
(vector (make-heartbeat-ack-chunk (get-heartbeat-parameter (vector-ref chunks 0))))
peer-addr
local-addr)
(if (= tester-heartbeat-mode heartbeat-mode-confirm)
(set! secondary-path-confirmed #t))
(sctp-receive-chunk predicate header))
((vector-find chunks predicate)
result)
(else
(sctp-receive-chunk predicate header)))))
(define (sctp-ensure-path-verification header)
(unless (or secondary-path-confirmed
(not (= tester-heartbeat-mode heartbeat-mode-confirm))
(equal? tester-addr-1 tester-addr-2))
(let* ((result (sctp-receive))
(chunks (cadr result))
(local-addr (caddr result))
(peer-addr (cadddr result)))
(if (and (= (vector-length chunks) 1)
(heartbeat-chunk? (vector-ref chunks 0))
(equal? local-addr secondary-path-addr))
(begin
(sctp-send header
(vector (make-heartbeat-ack-chunk (get-heartbeat-parameter (vector-ref chunks 0))))
peer-addr
local-addr)
(set! secondary-path-confirmed #t))
(sctp-ensure-path-verification header)))))
(define (sctp-receive-chunk-with-timeout predicate timeout)
(let* ((result (sctp-receive timeout))
(chunks (cadr result)))
(if (or (equal? result (list #f #f #f #f #f))
(vector-find chunks predicate))
result
(sctp-receive-chunk-with-timeout predicate timeout))))
(define local-tag #x01020304)
(define (sctp-cleanup)
(if (not (= sut-port 0))
(begin
(sctp-send (make-common-header tester-port sut-port local-tag)
(vector (make-abort-chunk #t))
sut-addr)))
(sctp-reset)
(if (not sut-is-server)
(let* ((answer (sctp-receive))
(local-port (get-destination-port (car answer)))
(peer-port (get-source-port (car answer)))
(local-addr (caddr answer))
(peer-addr (cadddr answer))
(chunks (cadr answer)))
(if (and (= (vector-length chunks) 1)
(init-chunk? (vector-ref chunks 0)))
(sctp-send (make-common-header local-port peer-port (get-initiate-tag (vector-ref chunks 0)))
(vector (make-abort-chunk #f))
peer-addr
local-addr)
(sctp-send (make-common-header local-port peer-port (get-verification-tag (car answer)))
(vector (make-abort-chunk #t))
peer-addr
local-addr))))
(sctp-reset)
(set! secondary-path-confirmed #f)
(set! secondary-path-addr '()))
(define (choose-local-tag)
local-tag)
;;;(random (expt 2 32)))
(define (choose-tag)
(1+ (random (1- (expt 2 32)))))
(define (associate peer-addr peer-port os mis)
(associate-from-port peer-addr (random (expt 2 16)) peer-port os mis))
(define (associate-from-port peer-addr local-port peer-port os mis)
(let ((local-tag (choose-local-tag))
(local-tsn (random (expt 2 32))))
(sctp-send (make-common-header local-port peer-port 0)
(vector (make-init-chunk local-tag 1500 os mis local-tsn (if (equal? tester-addr-1 tester-addr-2)
(vector)
(vector (make-ipv4-address-parameter tester-addr-1)
(make-ipv4-address-parameter tester-addr-2)))))
peer-addr)
(let* ((answer (sctp-receive-chunk init-ack-chunk?))
(init-ack (vector-ref (cadr answer) 0))
(parameters (get-parameters init-ack))
(state-cookie (vector-find parameters cookie-parameter?))
(peer-tag (get-initiate-tag init-ack))
(local-addr (caddr answer))
(header (make-common-header local-port peer-port peer-tag)))
(sctp-send header
(vector (make-cookie-echo-chunk (get-cookie-parameter-cookie state-cookie)))
peer-addr)
(unless (equal? tester-addr-1 tester-addr-2)
(if (equal? tester-addr-1 local-addr)
(set! secondary-path-addr tester-addr-2)
(set! secondary-path-addr tester-addr-1)))
(sctp-receive-chunk cookie-ack-chunk?)
(sleep tester-handshake-wait)
(cond
((= upper-layer-protocol ulp-echo)
(sctp-ensure-path-verification header)
(list header local-tsn (get-initial-tsn init-ack) peer-addr))
((= upper-layer-protocol ulp-http)
(sctp-ensure-path-verification header)
(list header local-tsn (get-initial-tsn init-ack) peer-addr))
((= upper-layer-protocol ulp-m3ua)
(sctp-ensure-path-verification header)
(list header local-tsn (get-initial-tsn init-ack) peer-addr))
((= upper-layer-protocol ulp-diameter)
(sctp-send header
(vector (make-data-chunk (+mod32 local-tsn 0) 0 0
diameter-ppid
diameter-capability-exchange-request
#f #t #t))
peer-addr)
(sctp-receive-chunk data-chunk? header)
(sctp-send header
(vector (make-sack-chunk (get-initial-tsn init-ack) 1500 #() #()))
peer-addr)
(if diameter-sut-sends-initial-watchdog-request
(let* ((result (sctp-receive-chunk data-chunk? header))
(data-chunk (vector-find (cadr result) data-chunk?))
(watchdog-request (vector->list (get-user-data data-chunk))))
(sctp-send header
(vector (make-sack-chunk (+mod32 (get-initial-tsn init-ack) 1) 1500 #() #()))
peer-addr)
;;; Don't respond with an answer, since this might trigger another request. Not sure why...
;;; (sctp-send header
;;; (vector (make-data-chunk (+mod32 local-tsn 1) 0 1
;;; diameter-ppid
;;; (list->vector (make-device-watchdog-answer-from-request watchdog-request
;;; diameter-origin-host
;;; diameter-origin-realm))
;;; #f #t #t))
;;; peer-addr)
;;; (sctp-receive-chunk sack-chunk?)
;;; (list header (+mod32 local-tsn 2) (+mod32 (get-initial-tsn init-ack) 2) peer-addr))
(sctp-ensure-path-verification header)
(list header (+mod32 local-tsn 1) (+mod32 (get-initial-tsn init-ack) 2) peer-addr))
(begin
(sctp-ensure-path-verification header)
(list header (+mod32 local-tsn 1) (+mod32 (get-initial-tsn init-ack) 1) peer-addr))))
(else
(error "Unsupported upper layer protocol:" upper-layer-protocol))))))
(define (accept-association os mis)
(let ((local-tag (choose-local-tag))
(local-tsn (random (expt 2 32))))
(let* ((answer (sctp-receive-chunk init-chunk?))
(init (vector-ref (cadr answer) 0))
(local-port (get-destination-port (car answer)))
(peer-port (get-source-port (car answer)))
(local-addr (caddr answer))
(peer-addr (cadddr answer))
(parameters (get-parameters init))
(peer-tag (get-initiate-tag init))
(header (make-common-header local-port peer-port peer-tag)))
(sctp-send header
(vector (make-init-ack-chunk local-tag 1500 os mis local-tsn (list->vector (cons (make-cookie-parameter (vector 1))
(if (equal? tester-addr-1 tester-addr-2)
(list)
(list (make-ipv4-address-parameter tester-addr-1)
(make-ipv4-address-parameter tester-addr-2)))))))
peer-addr)
(unless (equal? tester-addr-1 tester-addr-2)
(if (equal? tester-addr-1 local-addr)
(set! secondary-path-addr tester-addr-2)
(set! secondary-path-addr tester-addr-1)))
(sctp-receive-chunk cookie-echo-chunk?)
(sctp-send header
(vector (make-cookie-ack-chunk))
peer-addr)
(sleep tester-handshake-wait)
(cond
((= upper-layer-protocol ulp-echo)
(sctp-ensure-path-verification header)
(list header local-tsn (get-initial-tsn init) peer-addr))
((= upper-layer-protocol ulp-http)
(sctp-ensure-path-verification header)
(list header local-tsn (get-initial-tsn init) peer-addr))
((= upper-layer-protocol ulp-m3ua)
(sctp-receive-chunk data-chunk? header)
(sctp-send header
(vector (make-sack-chunk (get-initial-tsn init) 1500 #() #())
(make-data-chunk (+mod32 local-tsn 0) 0 0 test-ppid m3ua-aspup-ack-message #f #t #t)
(make-data-chunk (+mod32 local-tsn 1) 0 1 test-ppid m3ua-ntfy-inactive-message #f #t #t))
peer-addr)
(sctp-receive-chunk data-chunk? header)
(sctp-send header
(vector (make-sack-chunk (1+mod32 (get-initial-tsn init)) 1500 #() #())
(make-data-chunk (+mod32 local-tsn 2) 0 2 test-ppid m3ua-aspac-ack-message #f #t #t)
(make-data-chunk (+mod32 local-tsn 3) 0 3 test-ppid m3ua-ntfy-active-message #f #t #t))
peer-addr)
(sctp-receive-chunk sack-chunk?)
(sctp-ensure-path-verification header)
(list header (+mod32 local-tsn 4) (+mod32 (get-initial-tsn init) 2) peer-addr))
((= upper-layer-protocol ulp-diameter)
(let* ((result (sctp-receive-chunk data-chunk? header))
(data-chunk (vector-find (cadr result) data-chunk?))
(exchange-request (vector->list (get-user-data data-chunk))))
(sctp-send header
(vector (make-sack-chunk (get-initial-tsn init) 1500 #() #())
(make-data-chunk (+mod32 local-tsn 0) 0 0
diameter-ppid
(list->vector (make-capability-exchange-answer-from-request exchange-request
diameter-origin-host
diameter-origin-realm
diameter-host-ip-address
diameter-vendor-id
diameter-product-name))
#f #t #t))
peer-addr)
(sctp-receive-chunk sack-chunk?))
(if diameter-sut-sends-initial-watchdog-request
(let* ((result (sctp-receive-chunk data-chunk? header))
(data-chunk (vector-find (cadr result) data-chunk?))
(watchdog-request (vector->list (get-user-data data-chunk))))
(sctp-send header
(vector (make-sack-chunk (+mod32 (get-initial-tsn init) 1) 1500 #() #()))
peer-addr)
(sctp-ensure-path-verification header)
(list header (+mod32 local-tsn 1) (+mod32 (get-initial-tsn init) 2) peer-addr))
(begin
(sctp-ensure-path-verification header)
(list header (+mod32 local-tsn 1) (+mod32 (get-initial-tsn init) 1) peer-addr))))
(else
(error "Unsupported upper layer protocol:" upper-layer-protocol))))))
;;; (accept-association)
(define (make-random-bytes length)
(let ((v (make-vector length)))
(do ((i 0 (+ i 1)))
((= i length) v)
(vector-set! v i (random 256)))))
(define (make-ascii-bytes string)
(list->vector (map char->integer (string->list string))))