;;;; This file is part of Guile Netlink

;;;;

;;;; Copyright (C) 2020 Julien Lepiller <julien@lepiller.eu>

;;;; 

;;;; This library is free software: you can redistribute it and/or modify

;;;; it under the terms of the GNU General Public License as published by

;;;; the Free Software Foundation, either version 3 of the License, or

;;;; (at your option) any later version.

;;;;

;;;; This library 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 General Public License for more details.

;;;;

;;;; You should have received a copy of the GNU General Public License

;;;; along with this library.  If not, see <https://www.gnu.org/licenses/>.

(define-module (netlink route link)

  #:use-module (ice-9 match)

  #:use-module (netlink data)

  #:use-module (netlink route)

  #:use-module (netlink route attrs)

  #:use-module (srfi srfi-9)

  #:use-module (rnrs bytevectors)

  #:export (make-link-message

            link-message?

            link-message-family

            link-message-kind

            link-message-index

            link-message-flags

            link-message-attrs

            deserialize-link-message))

(define-data-type link-message

  (lambda (msg)

     (+ 16 (route-attr-list-size (link-message-type-attrs msg))))

  (lambda (msg pos bv)

    (match msg

      (($ link-message-type family type index flags change attrs)

       (bytevector-u16-set! bv pos family (native-endianness))

       (bytevector-u16-set! bv (+ pos 2) type (native-endianness))

       (bytevector-u32-set! bv (+ pos 4) index (native-endianness))

       (bytevector-u32-set! bv (+ pos 8) flags (native-endianness))

       (bytevector-u32-set! bv (+ pos 12) change (native-endianness))

       (serialize-route-attr-list attrs (+ pos 16) bv))))

  (family link-message-family link-message-type-family)

  (type link-message-kind link-message-type-type)

  (index link-message-index link-message-type-index)

  (flags link-message-flags link-message-type-flags)

  (change link-message-change link-message-type-change)

  (attrs link-message-attrs link-message-type-attrs))

(define (deserialize-link-message decoder bv pos)

  (make-link-message

    (bytevector-u16-ref bv pos (native-endianness))

    (bytevector-u16-ref bv (+ pos 2) (native-endianness))

    (bytevector-u32-ref bv (+ pos 4) (native-endianness))

    (bytevector-u32-ref bv (+ pos 8) (native-endianness))

    (bytevector-u32-ref bv (+ pos 12) (native-endianness))

    (deserialize-attr-list 'link-attr decoder bv (+ pos 16))))