;;;; 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 route)

  #:use-module (ice-9 match)

  #:use-module (netlink data)

  #:use-module (netlink error)

  #:use-module (netlink route)

  #:use-module (netlink route attrs)

  #:use-module (srfi srfi-9)

  #:use-module (srfi srfi-34)

  #:use-module (srfi srfi-35)

  #:use-module (rnrs bytevectors)

  #:export (make-route-message

            route-message?

            route-message-family

            route-message-dest-len

            route-message-src-len

            route-message-tos

            route-message-table

            route-message-protocol

            route-message-scope

            route-message-type

            route-message-flags

            route-message-attrs

            deserialize-route-message))

(define-data-type route-message

  (lambda (msg)

    (+ 12 (route-attr-list-size (route-message-type-attrs msg))))

  (lambda (msg pos bv)

    (match msg

      (($ route-message-type family dest-len src-len tos table protocol

          scope type flags attrs)

       (bytevector-u8-set! bv pos family)

       (bytevector-u8-set! bv (+ pos 1) dest-len)

       (bytevector-u8-set! bv (+ pos 2) src-len)

       (bytevector-u8-set! bv (+ pos 3) tos)

       (bytevector-u8-set! bv (+ pos 4) table)

       (bytevector-u8-set! bv (+ pos 5) protocol)

       (bytevector-u8-set! bv (+ pos 6) scope)

       (bytevector-u8-set! bv (+ pos 7) type)

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

       (serialize-route-attr-list attrs (+ pos 12) bv))))

  (family route-message-family route-message-type-family)

  (dest-len route-message-dest-len route-message-type-dest-len)

  (src-len route-message-src-len route-message-type-src-len)

  (tos route-message-tos route-message-type-tos)

  (table route-message-table route-message-type-table)

  (protocol route-message-protocol route-message-type-protocol)

  (scope route-message-scope route-message-type-scope)

  (type route-message-kind route-message-type-type)

  (flags route-message-flags route-message-type-flags)

  (attrs route-message-attrs route-message-type-attrs))

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

  (let ((family (bytevector-u8-ref bv pos)))

    (make-route-message

      family

      (bytevector-u8-ref bv (+ pos 1))

      (bytevector-u8-ref bv (+ pos 2))

      (bytevector-u8-ref bv (+ pos 3))

      (bytevector-u8-ref bv (+ pos 4))

      (bytevector-u8-ref bv (+ pos 5))

      (bytevector-u8-ref bv (+ pos 6))

      (bytevector-u8-ref bv (+ pos 7))

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

      (deserialize-attr-list

        (cond

          ((equal? family AF_INET) 'ipv4-route-attr)

          ((equal? family AF_INET6) 'ipv6-route-attr)

          (else (raise (condition (&netlink-family-error (family family))))))

        decoder bv (+ pos 12)))))