guile-netlink/netlink/route/route.scm

route.scm

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;;;; Copyright (C) 2020 Julien Lepiller <julien@lepiller.eu>
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (netlink route route)
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  #:use-module (ice-9 match)
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  #:use-module (netlink data)
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  #:use-module (netlink route)
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  #:use-module (netlink route attrs)
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  #:use-module (srfi srfi-9)
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  #:use-module (rnrs bytevectors)
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  #:export (make-route-message
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            route-message?
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            route-message-family
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            route-message-dest-len
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            route-message-src-len
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            route-message-tos
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            route-message-table
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            route-message-protocol
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            route-message-scope
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            route-message-type
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            route-message-flags
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            route-message-attrs
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            deserialize-route-message))
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(define-data-type route-message
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  (lambda (msg)
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    (+ 12 (route-attr-list-size (addr-message-type-attrs msg))))
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  (lambda (msg pos bv)
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    (match msg
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      (($ route-message-type family dest-len src-len tos table protocol
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          scope type flags attrs)
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       (bytevector-u8-set! bv pos family)
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       (bytevector-u8-set! bv (+ pos 1) dest-len)
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       (bytevector-u8-set! bv (+ pos 2) src-len)
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       (bytevector-u8-set! bv (+ pos 3) tos)
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       (bytevector-u8-set! bv (+ pos 4) table)
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       (bytevector-u8-set! bv (+ pos 5) protocol)
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       (bytevector-u8-set! bv (+ pos 6) scope)
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       (bytevector-u8-set! bv (+ pos 7) type)
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       (bytevector-u32-set! bv (+ pos 8) flags (native-endianness))
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       (serialize-route-attr-list attrs (+ pos 12) bv))))
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  (family addr-message-family addr-message-type-family)
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  (dest-len addr-message-dest-len addr-message-type-dest-len)
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  (src-len addr-message-src-len addr-message-type-src-len)
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  (tos addr-message-tos addr-message-type-tos)
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  (table addr-message-table addr-message-type-table)
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  (protocol addr-message-protocol addr-message-type-protocol)
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  (scope addr-message-scope addr-message-type-scope)
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  (type addr-message-kind addr-message-type-type)
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  (flags addr-message-flags addr-message-type-flags)
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  (attrs addr-message-attrs addr-message-type-attrs))
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(define (deserialize-route-message decoder bv pos)
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  (let ((family (bytevector-u8-ref bv pos)))
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    (make-route-message
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      family
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      (bytevector-u8-ref bv (+ pos 1))
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      (bytevector-u8-ref bv (+ pos 2))
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      (bytevector-u8-ref bv (+ pos 3))
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      (bytevector-u8-ref bv (+ pos 4))
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      (bytevector-u8-ref bv (+ pos 5))
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      (bytevector-u8-ref bv (+ pos 6))
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      (bytevector-u8-ref bv (+ pos 7))
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      (bytevector-u32-ref bv (+ pos 8) (native-endianness))
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      (deserialize-attr-list
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        (cond
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          ((equal? family AF_INET) 'ipv4-route-attr)
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          ((equal? family AF_INET6) 'ipv6-route-attr)
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          (else (throw 'unknown-family family)))
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        decoder bv (+ pos 12)))))
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