#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/circuits.ppp-dslmodem - PPP over a Fritz!Card DSL
#
# Creation:     28.05.2003 ow
# Last Update:  $Id$
#----------------------------------------------------------------------------

# PPPoE, see RFC 2516 for details
DSL_PPPOE_MTU=1492     # 1500 (Ethernet MTU) - 6 (PPPoE header)
                       # - 2 (PPP header without address/control bytes)

# PPPoA/VC-Mux, see RFC 2364 for details
DSL_PPPOA_VC_MTU=1478  # 1488 (31 ATM cells of 48 bytes)
                       # - 2 (PPP header without address/control bytes)
                       # - 8 (PPPoA CPCS-PDU Trailer)

# PPPoA/LLC, see RFC 2364 for details
DSL_PPPOA_LLC_MTU=1474 # 1478 (DSL_PPPOA_VC_MTU) - 4 (LLC header)

# other variants like "PPPoA/LLC+SNAP" or "LLC Encapsulated Bridged Ethernet"
# are not supported by the Fritz!DSL (at least to my knowledge)

# $1 = circuit information file
# $2 = PPP peer file
# $3 = variable receiving an error message (if any)
ppp_dslmodem_circuit_add()
{
    case $circ_ppp_dslmodem_type in
    fcdsl*)
        # set by etc/rc.d/rc220.i4l if AVM CAPI is used
        if [ -f /var/run/avm_capi ]
        then
            local controller=2
        else
            local controller=1
            # we don't know if CAPI has already been loaded for a non-AVM CAPI
            # adapter, so we have to do it now (init_capi will not do anything
            # if CAPI layer has already been initialized)
            init_capi
        fi

        case $circ_ppp_dslmodem_type in
        fcdslsl)
            do_modprobe fcdslsl
            avmcapictrl load /lib/firmware/isdn/fdssbase.bin $controller
            ;;
        fcdslslusb)
            do_modprobe fcdslslusb
            avmcapictrl load /lib/firmware/isdn/fdlubase.frm $controller
            ;;
        esac

        local vpi= pci= protocol=
        case "$circ_ppp_dslmodem_provider" in
        U-R2|ECI)
            vpi=1
            vci=32
            protocol=adslpppoe
            ;;
        Siemens)
            vpi=130
            vci=32
            protocol=adslpppoe
            ;;
        Switzerland|Belgium|Netcologne)
            vpi=8
            vci=35
            protocol=adslpppoe
            ;;
        Austria1)
            vpi=8
            vci=67
            protocol=adslpppoa
            ;;
        Austria2)
            vpi=8
            vci=48
            protocol=adslpppoa
            ;;
        Austria3)
            vpi=8
            vci=67
            protocol=adslpppoallc
            ;;
        Austria4)
            vpi=8
            vci=48
            protocol=adslpppoallc
            ;;
        oldArcor)
            vpi=8
            vci=35
            protocol=adslpppoa
            ;;
        esac

        local default_mtu=
        case $protocol in
        adslpppoe)
            default_mtu=$DSL_PPPOE_MTU ;;
        adslpppoa)
            default_mtu=$DSL_PPPOA_VC_MTU ;;
        adslpppoallc)
            default_mtu=$DSL_PPPOA_LLC_MTU ;;
        esac

        : ${circ_ppp_mtu:=$default_mtu}
        : ${circ_ppp_mru:=$default_mtu}
        ppp_connect=/bin/true

        cat >> $2 <<EOF
plugin capiplugin.so
/dev/null
avmadsl
local
sync
EOF

        cat >> $1 << EOF
circ_ppp_dslmodem_type="$circ_ppp_dslmodem_type"
circ_ppp_dslmodem_provider="$circ_ppp_dslmodem_provider"
EOF

        mkdir -p /etc/drdsl
        cat >/etc/drdsl/adsl.conf <<EOF
controller $controller
protocol   $protocol
vpi        $vpi
vci        $vci
EOF

        do_modprobe ppp_synctty

        # for compatibility, map pppoe to the first configured PPPoE circuit
        local dslmodem_circ=$(circuit_lookup_alias pppoe)
        if [ -z "$dslmodem_circ" ]
        then
            # map pppoe circuit to be able to use 'pppoe' as a circuit name
            # in fli4lctrl invocations
            circuit_register_alias pppoe $circ_id
            # map pppoe interface to be able to use 'pppoe' in firewall
            # rules
            net_alias_add pppoe $circ_dev TID_
        fi

        return 0
        ;;
    *)
        eval $3=\"Unknown DSL modem type '${circ_ppp_dslmodem_type}'\"
        return 1
        ;;
    esac
}