netlink/route/link.scm \

  netlink/route/route.scm

  #:use-module ((netlink route route) #:prefix route:)

      (,RTM_GETADDR . ,route:deserialize-addr-message)

      (,RTM_NEWROUTE . ,route:deserialize-route-message)

      (,RTM_DELROUTE . ,route:deserialize-route-message)

      (,RTM_GETROUTE . ,route:deserialize-route-message))

    (ipv4-addr-attr ,(route:deserialize-route-attr 'ipv4-addr-attr)

                    ,@route:%default-route-addr-ipv4-attr-decoder)

    (ipv6-addr-attr ,(route:deserialize-route-attr 'ipv6-addr-attr)

                    ,@route:%default-route-addr-ipv6-attr-decoder)

    (ipv4-route-attr ,(route:deserialize-route-attr 'ipv4-route-attr)

                     ,@route:%default-route-route-ipv4-attr-decoder)

    (ipv6-route-attr ,(route:deserialize-route-attr 'ipv6-route-attr)

                     ,@route:%default-route-route-ipv6-attr-decoder)))

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

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

           deserialize-route-attr-data-u16

           %default-route-addr-ipv6-attr-decoder

           %default-route-link-attr-decoder

           %default-route-route-ipv4-attr-decoder

           %default-route-route-ipv6-attr-decoder))

(define (deserialize-route-attr-data-u16 decoder bv pos)

  (make-u32-route-attr (bytevector-u16-ref bv pos (native-endianness))))

(define (default-route-route-attr-decoder address-decoder)

  `((,RTA_DST . ,address-decoder)

    (,RTA_SRC . ,address-decoder)

    (,RTA_IIF . ,deserialize-route-attr-data-u32)

    (,RTA_OIF . ,deserialize-route-attr-data-u32)

    (,RTA_GATEWAY . ,address-decoder)

    (,RTA_PRIORITY . ,deserialize-route-attr-data-u32)

    (,RTA_PREFSRC . ,address-decoder)

    (,RTA_METRICS . ,deserialize-route-attr-data-u32)

    ;; TODO: struct rtnexthop

    ;(,RTA_MULTIPATH . ,deserialize-route-attr-data-rt-next-hop)

    (,RTA_FLOW . ,deserialize-route-attr-data-u32)

    ; TODO: struct rta_cacheinfo

    ;(,RTA_CACHEINFO . ,deserialize-route-attr-data-rta-cache-info)

    (,RTA_TABLE . ,deserialize-route-attr-data-u32)

    (,RTA_MARK . ,deserialize-route-attr-data-u32)

    ;; TODO: struct rta_mfc_stats

    ;(,RTA_MFC_STATS . ,deserialize-route-attr-data-rta-mfc-stats)

    ;; TODO: struct rtvia

    ;(,RTA_VIA . ,,deserialize-route-attr-data-rtvia)

    (,RTA_NEWDST . ,address-decoder)

    (,RTA_PREF . ,deserialize-route-attr-data-u8)

    (,RTA_ENCAP_TYPE . ,deserialize-route-attr-data-u16)

    ;; TODO: defined by RTA_ENCAP_TYPE

    ;(,RTA_ENCAP . ??)

    (,RTA_EXPIRES . ,deserialize-route-attr-data-u32)

    (default . ,deserialize-route-attr-data-bv)))

(define %default-route-route-ipv4-attr-decoder

  (default-route-route-attr-decoder deserialize-route-attr-data-ipv4))

(define %default-route-route-ipv6-attr-decoder

  (default-route-route-attr-decoder deserialize-route-attr-data-ipv6))

;;;; 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 Lesser 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

;;;; Lesser General Public License for more details.

;;;; 

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

;;;; License along with this library; if not, write to the Free Software

;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

;;;; 

(define-module (netlink route route)

  #:use-module (ice-9 match)

  #:use-module (netlink data)

  #:use-module (netlink route attrs)

  #:use-module (srfi srfi-9)

  #: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 (align pos to)

  (+ pos -1 (- to (modulo (- pos 1) to))))

(define-data-type route-message

  (lambda (msg)

    (+ 12 (apply + (map (lambda (d) (align (data-size d) 4)) attrs))))

  (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))

       (let loop ((attrs attrs) (pos (+ pos 12)))

         (match attrs

           ((attr attrs ...)

            (serialize attr pos bv)

            (loop attrs (+ pos (align (data-size attr) 4))))

           (() #t))))))

  (family addr-message-family addr-message-type-family)

  (dest-len addr-message-dest-len addr-message-type-dest-len)

  (src-len addr-message-src-len addr-message-type-src-len)

  (tos addr-message-tos addr-message-type-tos)

  (table addr-message-table addr-message-type-table)

  (protocol addr-message-protocol addr-message-type-protocol)

  (scope addr-message-scope addr-message-type-scope)

  (type addr-message-kind addr-message-type-type)

  (flags addr-message-flags addr-message-type-flags)

  (attrs addr-message-attrs addr-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))

      (let ((len (bytevector-length bv)))

        (let loop ((pos (+ pos 12)) (attrs '()))

          (if (>= pos len)

              attrs

              (let ((attr (deserialize (cond

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

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

                                         (else (throw 'unknown-family family)))

                                       decoder bv pos)))

                (loop (+ pos (align (data-size attr) 4))

                      (cons attr attrs)))))))))