;;;; 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 constant)

               #:export (define-enum))

(define-syntax define-enum-aux

  (syntax-rules ()

    ((_ num (name n))

     (define-public name n))

    ((_ num name)

     (define-public name num))

    ((_ num (name n) rest ...)

     (begin

       (define-public name n)

       (define-enum-aux (+ n 1) rest ...)))

    ((_ num name rest ...)

     (begin

       (define-public name num)

       (define-enum-aux (+ num 1) rest ...)))))

(define-syntax define-enum

  (lambda (x)

    (define (spec-names specs)

      (map

        (lambda (spec)

          (syntax-case spec ()

            ((name val) #'name)

            (name #'name)))

        specs))

    (define (getter num name)

      #`((= #,num #,name) (quote #,name)))

    (syntax-case x ()

      ((_ integer->symbol name-spec ...)

       #`(begin

           (define-enum-aux 0 name-spec ...)

           (define-public (integer->symbol num)

             (cond

               #,@(map (lambda (s) (getter #'num s)) (spec-names #'(name-spec ...))))))))))

(define-enum int->attr-kind

             IFLA_UNSPEC IFLA_ADDRESS IFLA_BROADCAST IFLA_IFNAME IFLA_MTU

             IFLA_LINK IFLA_QDISC IFLA_STATS IFLA_COST IFLA_PRIORITY

             IFLA_MASTER IFLA_WIRELESS IFLA_PROTIFO IFLA_TXQLEN IFLA_MAP

             IFLA_WEIGHT IFLA_OPERSTATE IFLA_LINKMODE IFLA_LINKINFO

             IFLA_NET_NS_PID IFLA_IFALIAS IFLA_NUM_VF IFLA_VFINFO_LIST

             IFLA_STATS64 IFLA_VF_PORTS IFLA_PORT_SELF IFLA_AF_SPEC

             IFLA_GROUP IFLA_NET_NS_FD IFLA_EXT_MASK IFLA_PROMISCUITY

             IFLA_NUM_TX_QUEUES IFLA_NUM_RX_QUEUES IFLA_CARRIER

             IFLA_PHYS_PORT_ID IFLA_CARRIER_CHANGES IFLA_PHYS_SWITCH_ID

             IFLA_LINK_NETNSID IFLA_PHYS_PORT_NAME IFLA_PROTO_DOWN

             IFLA_GSO_MAX_SEGS IFLA_GSO_MAX_SIZE IFLA_PAD IFLA_XDP

             IFLA_EVENT IFLA_NEW_NETNSID IFLA_IF_NETNSID IFLA_CARRIER_UP_COUNT

             IFLA_CARRIER_DOWN_COUNT IFLA_NEW_IFINDEX IFLA_MIN_MTU IFLA_MAX_MTU

             IFLA_PROP_LIST IFLA_ALT_IFNAME IFLA_PERM_ADDRESS)

(define-public IFLA_TARGET_NETNSID IFLA_IF_NETNSID)

(define-public AF_NETLINK 16)

(define-public AF_PACKET 17)

(define-enum int->protocol

             NETLINK_ROUTE NETLINK_UNUSED NETLINK_USERSOCK NETLINK_FIREWALL

             NETLINK_SOCK_DIAG NETLINK_NFLOG NETLINK_XFRM NETLINK_SELINUX

             NETLINK_ISCSI NETLINK_AUDIT NETLINK_FIB_LOOKUP NETLINK_CONNECTOR

             NETLINK_NETFILTER NETLINK_IP6_FW NETLINK_DNRTMSG NETLINK_KOBJECT_UEVENT

             NETLINK_GENERIC NETLINK_DM NETLINK_SCSITRANSPORT NETLINK_ECRYPTFS

             NETLINK_RDMA NETLINK_CRYPTO NETLINK_SMC)

(define-public NETLINK_INET_DIAG NETLINK_SOCK_DIAG)

(define-enum int->message-kind

  (NLMSG_NOOP 1)

  NLMSG_ERROR

  NLMSG_DONE

  NLMSG_OVERUN

  (RTM_NEWLINK 16)

  RTM_DELLINK

  RTM_GETLINK

  RTM_SETLINK

  (RTM_NEWADDR 20)

  RTM_DELADDR

  RTM_GETADDR)

(define-public NLM_F_REQUEST #x01)

(define-public NLM_F_MULTI #x02)

(define-public NLM_F_ACK #x04)

(define-public NLM_F_ECHO #x08)

(define-public NLM_F_DUMP_INTR #x10)

(define-public NLM_F_DUMP_FILTERED #x20)

;; modifiers to GET requests

(define-public NLM_F_ROOT #x100)

(define-public NLM_F_MATCH #x200)

(define-public NLM_F_ATOMIC #x400)

(define-public NLM_F_DUMP (logior NLM_F_ROOT NLM_F_MATCH))

;; modifiers to NEW requests

(define-public NLM_F_REPLACE #x100)

(define-public NLM_F_EXCL #x200)

(define-public NLM_F_CREATE #x400)

(define-public NLM_F_APPEND #x800)

(define-public NLM_F_NONREC #x100)

(define-public NLM_F_CAPPED #x100)

(define-public NLM_F_ACK_TLVS #x200)

;; operstate

(define-enum int->operstate

             IF_OPER_UNKNOWN IF_OPER_NOTPRESENT IF_OPER_DOWN

             IF_OPER_LOWERLAYERDOWN IF_OPER_TESTING IF_OPER_DORMANT

             IF_OPER_UP)