;;;; 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 addr)
  #: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 (rnrs bytevectors)
  #:export (make-addr-message
            addr-message?
            addr-message-family
            addr-message-prefix-len
            addr-message-flags
            addr-message-scope
            addr-message-index
            addr-message-attrs
            deserialize-addr-message))

(define-data-type addr-message
  (lambda (msg)
    (+ 8 (route-attr-list-size (addr-message-type-attrs msg))))
  (lambda (msg pos bv)
    (match msg
      (($ addr-message-type family prefix-len flags scope index attrs)
       (bytevector-u8-set! bv pos family)
       (bytevector-u8-set! bv (+ pos 1) prefix-len)
       (bytevector-u8-set! bv (+ pos 2) flags)
       (bytevector-u8-set! bv (+ pos 3) scope)
       (bytevector-u32-set! bv (+ pos 4) index (native-endianness))
       (serialize-route-attr-list attrs (+ pos 8) bv))))
  (family addr-message-family addr-message-type-family)
  (prefix-len addr-message-prefix-len addr-message-type-prefix-len)
  (flags addr-message-flags addr-message-type-flags)
  (scope addr-message-scope addr-message-type-scope)
  (index addr-message-index addr-message-type-index)
  (attrs addr-message-attrs addr-message-type-attrs))

(define (deserialize-addr-message decoder bv pos)
  (let ((family (bytevector-u8-ref bv pos)))
    (make-addr-message
      family
      (bytevector-u8-ref bv (+ pos 1))
      (bytevector-u8-ref bv (+ pos 2))
      (bytevector-u8-ref bv (+ pos 3))
      (bytevector-u32-ref bv (+ pos 4) (native-endianness))
      (deserialize-attr-list
        (cond
          ((equal? family AF_INET) 'ipv4-addr-attr)
          ((equal? family AF_INET6) 'ipv6-addr-attr)
          (else (raise (condition (&netlink-family-error (family family))))))
        decoder bv (+ pos 8)))))